diff --dirstat-by-file: count changed files, not lines
[git/git.git] / diff.c
CommitLineData
6973dcae
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1/*
2 * Copyright (C) 2005 Junio C Hamano
3 */
6973dcae
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4#include "cache.h"
5#include "quote.h"
6#include "diff.h"
7#include "diffcore.h"
051308f6 8#include "delta.h"
6973dcae 9#include "xdiff-interface.h"
7c92fe0e 10#include "color.h"
8c701249 11#include "attr.h"
d5535ec7 12#include "run-command.h"
23707811 13#include "utf8.h"
6973dcae 14
1510fea7
SP
15#ifdef NO_FAST_WORKING_DIRECTORY
16#define FAST_WORKING_DIRECTORY 0
17#else
18#define FAST_WORKING_DIRECTORY 1
19#endif
20
96f1e58f 21static int diff_detect_rename_default;
50705915 22static int diff_rename_limit_default = 200;
a624eaa7 23static int diff_suppress_blank_empty;
6b2f2d98 24int diff_use_color_default = -1;
cbe02100 25static const char *external_diff_cmd_cfg;
aecbf914 26int diff_auto_refresh_index = 1;
6973dcae 27
7c92fe0e 28static char diff_colors[][COLOR_MAXLEN] = {
f37399e6 29 "\033[m", /* reset */
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30 "", /* PLAIN (normal) */
31 "\033[1m", /* METAINFO (bold) */
32 "\033[36m", /* FRAGINFO (cyan) */
33 "\033[31m", /* OLD (red) */
34 "\033[32m", /* NEW (green) */
35 "\033[33m", /* COMMIT (yellow) */
36 "\033[41m", /* WHITESPACE (red background) */
cd112cef
JS
37};
38
801235c5
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39static int parse_diff_color_slot(const char *var, int ofs)
40{
41 if (!strcasecmp(var+ofs, "plain"))
42 return DIFF_PLAIN;
43 if (!strcasecmp(var+ofs, "meta"))
44 return DIFF_METAINFO;
45 if (!strcasecmp(var+ofs, "frag"))
46 return DIFF_FRAGINFO;
47 if (!strcasecmp(var+ofs, "old"))
48 return DIFF_FILE_OLD;
49 if (!strcasecmp(var+ofs, "new"))
50 return DIFF_FILE_NEW;
ce436973
JK
51 if (!strcasecmp(var+ofs, "commit"))
52 return DIFF_COMMIT;
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53 if (!strcasecmp(var+ofs, "whitespace"))
54 return DIFF_WHITESPACE;
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55 die("bad config variable '%s'", var);
56}
57
f1af60bd
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58static struct ll_diff_driver {
59 const char *name;
60 struct ll_diff_driver *next;
b20a60d0 61 const char *cmd;
f1af60bd
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62} *user_diff, **user_diff_tail;
63
64/*
65 * Currently there is only "diff.<drivername>.command" variable;
66 * because there are "diff.color.<slot>" variables, we are parsing
67 * this in a bit convoluted way to allow low level diff driver
68 * called "color".
69 */
70static int parse_lldiff_command(const char *var, const char *ep, const char *value)
71{
72 const char *name;
73 int namelen;
74 struct ll_diff_driver *drv;
75
76 name = var + 5;
77 namelen = ep - name;
78 for (drv = user_diff; drv; drv = drv->next)
79 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
80 break;
81 if (!drv) {
f1af60bd 82 drv = xcalloc(1, sizeof(struct ll_diff_driver));
182af834 83 drv->name = xmemdupz(name, namelen);
f1af60bd
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84 if (!user_diff_tail)
85 user_diff_tail = &user_diff;
86 *user_diff_tail = drv;
87 user_diff_tail = &(drv->next);
88 }
89
b20a60d0 90 return git_config_string(&(drv->cmd), var, value);
f1af60bd
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91}
92
e0e324a4
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93/*
94 * 'diff.<what>.funcname' attribute can be specified in the configuration
95 * to define a customized regexp to find the beginning of a function to
96 * be used for hunk header lines of "diff -p" style output.
97 */
98static struct funcname_pattern {
99 char *name;
100 char *pattern;
101 struct funcname_pattern *next;
102} *funcname_pattern_list;
103
104static int parse_funcname_pattern(const char *var, const char *ep, const char *value)
105{
106 const char *name;
107 int namelen;
108 struct funcname_pattern *pp;
109
110 name = var + 5; /* "diff." */
111 namelen = ep - name;
112
113 for (pp = funcname_pattern_list; pp; pp = pp->next)
114 if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
115 break;
116 if (!pp) {
e0e324a4 117 pp = xcalloc(1, sizeof(*pp));
182af834 118 pp->name = xmemdupz(name, namelen);
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119 pp->next = funcname_pattern_list;
120 funcname_pattern_list = pp;
121 }
8e0f7003 122 free(pp->pattern);
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123 pp->pattern = xstrdup(value);
124 return 0;
125}
126
83ad63cf
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127/*
128 * These are to give UI layer defaults.
129 * The core-level commands such as git-diff-files should
130 * never be affected by the setting of diff.renames
131 * the user happens to have in the configuration file.
132 */
ef90d6d4 133int git_diff_ui_config(const char *var, const char *value, void *cb)
801235c5 134{
a159ca0c 135 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
0f6f5a40 136 diff_use_color_default = git_config_colorbool(var, value, -1);
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137 return 0;
138 }
b68ea12e
EW
139 if (!strcmp(var, "diff.renames")) {
140 if (!value)
141 diff_detect_rename_default = DIFF_DETECT_RENAME;
142 else if (!strcasecmp(value, "copies") ||
143 !strcasecmp(value, "copy"))
144 diff_detect_rename_default = DIFF_DETECT_COPY;
145 else if (git_config_bool(var,value))
146 diff_detect_rename_default = DIFF_DETECT_RENAME;
147 return 0;
148 }
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149 if (!strcmp(var, "diff.autorefreshindex")) {
150 diff_auto_refresh_index = git_config_bool(var, value);
151 return 0;
152 }
daec808c
BH
153 if (!strcmp(var, "diff.external"))
154 return git_config_string(&external_diff_cmd_cfg, var, value);
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155 if (!prefixcmp(var, "diff.")) {
156 const char *ep = strrchr(var, '.');
157
2c778210
CC
158 if (ep != var + 4 && !strcmp(ep, ".command"))
159 return parse_lldiff_command(var, ep, value);
f1af60bd 160 }
9a1805a8 161
ef90d6d4 162 return git_diff_basic_config(var, value, cb);
9a1805a8
JK
163}
164
ef90d6d4 165int git_diff_basic_config(const char *var, const char *value, void *cb)
9a1805a8 166{
2b6ca6df
LT
167 if (!strcmp(var, "diff.renamelimit")) {
168 diff_rename_limit_default = git_config_int(var, value);
169 return 0;
170 }
171
1968d77d 172 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
801235c5 173 int slot = parse_diff_color_slot(var, 11);
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174 if (!value)
175 return config_error_nonbool(var);
7c92fe0e 176 color_parse(value, var, diff_colors[slot]);
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177 return 0;
178 }
f1af60bd 179
a624eaa7
JM
180 /* like GNU diff's --suppress-blank-empty option */
181 if (!strcmp(var, "diff.suppress-blank-empty")) {
182 diff_suppress_blank_empty = git_config_bool(var, value);
183 return 0;
184 }
185
e467193f
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186 if (!prefixcmp(var, "diff.")) {
187 const char *ep = strrchr(var, '.');
188 if (ep != var + 4) {
64f30e94
JH
189 if (!strcmp(ep, ".funcname")) {
190 if (!value)
191 return config_error_nonbool(var);
e467193f 192 return parse_funcname_pattern(var, ep, value);
64f30e94 193 }
e467193f
JK
194 }
195 }
196
ef90d6d4 197 return git_color_default_config(var, value, cb);
801235c5
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198}
199
6973dcae
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200static char *quote_two(const char *one, const char *two)
201{
202 int need_one = quote_c_style(one, NULL, NULL, 1);
203 int need_two = quote_c_style(two, NULL, NULL, 1);
663af342 204 struct strbuf res;
6973dcae 205
663af342 206 strbuf_init(&res, 0);
6973dcae 207 if (need_one + need_two) {
663af342
PH
208 strbuf_addch(&res, '"');
209 quote_c_style(one, &res, NULL, 1);
210 quote_c_style(two, &res, NULL, 1);
211 strbuf_addch(&res, '"');
212 } else {
213 strbuf_addstr(&res, one);
214 strbuf_addstr(&res, two);
6973dcae 215 }
b315c5c0 216 return strbuf_detach(&res, NULL);
6973dcae
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217}
218
219static const char *external_diff(void)
220{
221 static const char *external_diff_cmd = NULL;
222 static int done_preparing = 0;
223
224 if (done_preparing)
225 return external_diff_cmd;
226 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
cbe02100
JS
227 if (!external_diff_cmd)
228 external_diff_cmd = external_diff_cmd_cfg;
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229 done_preparing = 1;
230 return external_diff_cmd;
231}
232
6973dcae
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233static struct diff_tempfile {
234 const char *name; /* filename external diff should read from */
235 char hex[41];
236 char mode[10];
1472966c 237 char tmp_path[PATH_MAX];
6973dcae
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238} diff_temp[2];
239
240static int count_lines(const char *data, int size)
241{
242 int count, ch, completely_empty = 1, nl_just_seen = 0;
243 count = 0;
244 while (0 < size--) {
245 ch = *data++;
246 if (ch == '\n') {
247 count++;
248 nl_just_seen = 1;
249 completely_empty = 0;
250 }
251 else {
252 nl_just_seen = 0;
253 completely_empty = 0;
254 }
255 }
256 if (completely_empty)
257 return 0;
258 if (!nl_just_seen)
259 count++; /* no trailing newline */
260 return count;
261}
262
c0c77734 263static void print_line_count(FILE *file, int count)
6973dcae
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264{
265 switch (count) {
266 case 0:
c0c77734 267 fprintf(file, "0,0");
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268 break;
269 case 1:
c0c77734 270 fprintf(file, "1");
6973dcae
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271 break;
272 default:
c0c77734 273 fprintf(file, "1,%d", count);
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274 break;
275 }
276}
277
c0c77734
DB
278static void copy_file_with_prefix(FILE *file,
279 int prefix, const char *data, int size,
1468bd47 280 const char *set, const char *reset)
6973dcae
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281{
282 int ch, nl_just_seen = 1;
283 while (0 < size--) {
284 ch = *data++;
13e36ec5 285 if (nl_just_seen) {
c0c77734
DB
286 fputs(set, file);
287 putc(prefix, file);
13e36ec5
JS
288 }
289 if (ch == '\n') {
6973dcae 290 nl_just_seen = 1;
c0c77734 291 fputs(reset, file);
13e36ec5 292 } else
6973dcae 293 nl_just_seen = 0;
c0c77734 294 putc(ch, file);
6973dcae
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295 }
296 if (!nl_just_seen)
c0c77734 297 fprintf(file, "%s\n\\ No newline at end of file\n", reset);
6973dcae
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298}
299
300static void emit_rewrite_diff(const char *name_a,
301 const char *name_b,
302 struct diff_filespec *one,
13e36ec5 303 struct diff_filespec *two,
eab9a40b 304 struct diff_options *o)
6973dcae
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305{
306 int lc_a, lc_b;
eab9a40b 307 int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
1a9eb3b9 308 const char *name_a_tab, *name_b_tab;
13e36ec5
JS
309 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
310 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
311 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
312 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
313 const char *reset = diff_get_color(color_diff, DIFF_RESET);
d5625091 314 static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
1a9eb3b9 315
8a13becc
JH
316 name_a += (*name_a == '/');
317 name_b += (*name_b == '/');
1a9eb3b9
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318 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
319 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
320
d5625091
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321 strbuf_reset(&a_name);
322 strbuf_reset(&b_name);
323 quote_two_c_style(&a_name, o->a_prefix, name_a, 0);
324 quote_two_c_style(&b_name, o->b_prefix, name_b, 0);
325
6973dcae
JH
326 diff_populate_filespec(one, 0);
327 diff_populate_filespec(two, 0);
328 lc_a = count_lines(one->data, one->size);
329 lc_b = count_lines(two->data, two->size);
c0c77734
DB
330 fprintf(o->file,
331 "%s--- %s%s%s\n%s+++ %s%s%s\n%s@@ -",
332 metainfo, a_name.buf, name_a_tab, reset,
333 metainfo, b_name.buf, name_b_tab, reset, fraginfo);
334 print_line_count(o->file, lc_a);
335 fprintf(o->file, " +");
336 print_line_count(o->file, lc_b);
337 fprintf(o->file, " @@%s\n", reset);
6973dcae 338 if (lc_a)
c0c77734 339 copy_file_with_prefix(o->file, '-', one->data, one->size, old, reset);
6973dcae 340 if (lc_b)
c0c77734 341 copy_file_with_prefix(o->file, '+', two->data, two->size, new, reset);
6973dcae
JH
342}
343
344static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
345{
346 if (!DIFF_FILE_VALID(one)) {
d2543b8e 347 mf->ptr = (char *)""; /* does not matter */
6973dcae
JH
348 mf->size = 0;
349 return 0;
350 }
351 else if (diff_populate_filespec(one, 0))
352 return -1;
353 mf->ptr = one->data;
354 mf->size = one->size;
355 return 0;
356}
357
f59a59e2
JS
358struct diff_words_buffer {
359 mmfile_t text;
360 long alloc;
361 long current; /* output pointer */
362 int suppressed_newline;
363};
364
365static void diff_words_append(char *line, unsigned long len,
366 struct diff_words_buffer *buffer)
367{
368 if (buffer->text.size + len > buffer->alloc) {
369 buffer->alloc = (buffer->text.size + len) * 3 / 2;
370 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
371 }
372 line++;
373 len--;
374 memcpy(buffer->text.ptr + buffer->text.size, line, len);
375 buffer->text.size += len;
376}
377
378struct diff_words_data {
f59a59e2 379 struct diff_words_buffer minus, plus;
c0c77734 380 FILE *file;
f59a59e2
JS
381};
382
c0c77734 383static void print_word(FILE *file, struct diff_words_buffer *buffer, int len, int color,
f59a59e2
JS
384 int suppress_newline)
385{
386 const char *ptr;
387 int eol = 0;
388
389 if (len == 0)
390 return;
391
392 ptr = buffer->text.ptr + buffer->current;
393 buffer->current += len;
394
395 if (ptr[len - 1] == '\n') {
396 eol = 1;
397 len--;
398 }
399
c0c77734
DB
400 fputs(diff_get_color(1, color), file);
401 fwrite(ptr, len, 1, file);
402 fputs(diff_get_color(1, DIFF_RESET), file);
f59a59e2
JS
403
404 if (eol) {
405 if (suppress_newline)
406 buffer->suppressed_newline = 1;
407 else
c0c77734 408 putc('\n', file);
f59a59e2
JS
409 }
410}
411
412static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
413{
414 struct diff_words_data *diff_words = priv;
415
416 if (diff_words->minus.suppressed_newline) {
417 if (line[0] != '+')
c0c77734 418 putc('\n', diff_words->file);
f59a59e2
JS
419 diff_words->minus.suppressed_newline = 0;
420 }
421
422 len--;
423 switch (line[0]) {
424 case '-':
c0c77734
DB
425 print_word(diff_words->file,
426 &diff_words->minus, len, DIFF_FILE_OLD, 1);
f59a59e2
JS
427 break;
428 case '+':
c0c77734
DB
429 print_word(diff_words->file,
430 &diff_words->plus, len, DIFF_FILE_NEW, 0);
f59a59e2
JS
431 break;
432 case ' ':
c0c77734
DB
433 print_word(diff_words->file,
434 &diff_words->plus, len, DIFF_PLAIN, 0);
f59a59e2
JS
435 diff_words->minus.current += len;
436 break;
437 }
438}
439
440/* this executes the word diff on the accumulated buffers */
441static void diff_words_show(struct diff_words_data *diff_words)
442{
443 xpparam_t xpp;
444 xdemitconf_t xecfg;
445 xdemitcb_t ecb;
446 mmfile_t minus, plus;
447 int i;
448
30b25010 449 memset(&xecfg, 0, sizeof(xecfg));
f59a59e2
JS
450 minus.size = diff_words->minus.text.size;
451 minus.ptr = xmalloc(minus.size);
452 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
453 for (i = 0; i < minus.size; i++)
454 if (isspace(minus.ptr[i]))
455 minus.ptr[i] = '\n';
456 diff_words->minus.current = 0;
457
458 plus.size = diff_words->plus.text.size;
459 plus.ptr = xmalloc(plus.size);
460 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
461 for (i = 0; i < plus.size; i++)
462 if (isspace(plus.ptr[i]))
463 plus.ptr[i] = '\n';
464 diff_words->plus.current = 0;
465
466 xpp.flags = XDF_NEED_MINIMAL;
467 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
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JH
468 xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
469 &xpp, &xecfg, &ecb);
f59a59e2
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470 free(minus.ptr);
471 free(plus.ptr);
472 diff_words->minus.text.size = diff_words->plus.text.size = 0;
473
474 if (diff_words->minus.suppressed_newline) {
c0c77734 475 putc('\n', diff_words->file);
f59a59e2
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476 diff_words->minus.suppressed_newline = 0;
477 }
478}
479
23707811
JH
480typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
481
6973dcae 482struct emit_callback {
cd112cef 483 int nparents, color_diff;
cf1b7869 484 unsigned ws_rule;
23707811 485 sane_truncate_fn truncate;
6973dcae 486 const char **label_path;
f59a59e2 487 struct diff_words_data *diff_words;
34a5e1a2 488 int *found_changesp;
c0c77734 489 FILE *file;
6973dcae
JH
490};
491
f59a59e2
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492static void free_diff_words_data(struct emit_callback *ecbdata)
493{
494 if (ecbdata->diff_words) {
495 /* flush buffers */
496 if (ecbdata->diff_words->minus.text.size ||
497 ecbdata->diff_words->plus.text.size)
498 diff_words_show(ecbdata->diff_words);
499
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JM
500 free (ecbdata->diff_words->minus.text.ptr);
501 free (ecbdata->diff_words->plus.text.ptr);
f59a59e2
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502 free(ecbdata->diff_words);
503 ecbdata->diff_words = NULL;
504 }
505}
506
ce436973 507const char *diff_get_color(int diff_use_color, enum color_diff ix)
cd112cef
JS
508{
509 if (diff_use_color)
50f575fc
LT
510 return diff_colors[ix];
511 return "";
cd112cef
JS
512}
513
c0c77734 514static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
448c3ef1 515{
4afbcab9
JH
516 int has_trailing_newline = (len > 0 && line[len-1] == '\n');
517 if (has_trailing_newline)
06ff64ae
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518 len--;
519
c0c77734
DB
520 fputs(set, file);
521 fwrite(line, len, 1, file);
522 fputs(reset, file);
4afbcab9
JH
523 if (has_trailing_newline)
524 fputc('\n', file);
448c3ef1
JH
525}
526
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JS
527static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
528{
529 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
530 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
531
532 if (!*ws)
c0c77734 533 emit_line(ecbdata->file, set, reset, line, len);
c1795bb0
WC
534 else {
535 /* Emit just the prefix, then the rest. */
c0c77734 536 emit_line(ecbdata->file, set, reset, line, ecbdata->nparents);
8f8841e9
JH
537 ws_check_emit(line + ecbdata->nparents,
538 len - ecbdata->nparents, ecbdata->ws_rule,
539 ecbdata->file, set, reset, ws);
c1795bb0 540 }
c5a8c3ec
JS
541}
542
23707811
JH
543static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
544{
545 const char *cp;
546 unsigned long allot;
547 size_t l = len;
548
549 if (ecb->truncate)
550 return ecb->truncate(line, len);
551 cp = line;
552 allot = l;
553 while (0 < l) {
554 (void) utf8_width(&cp, &l);
555 if (!cp)
556 break; /* truncated in the middle? */
557 }
558 return allot - l;
559}
560
cd112cef 561static void fn_out_consume(void *priv, char *line, unsigned long len)
6973dcae
JH
562{
563 int i;
448c3ef1 564 int color;
6973dcae 565 struct emit_callback *ecbdata = priv;
472ca780
JK
566 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
567 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
ce436973 568 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
6973dcae 569
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JS
570 *(ecbdata->found_changesp) = 1;
571
6973dcae 572 if (ecbdata->label_path[0]) {
1a9eb3b9
JH
573 const char *name_a_tab, *name_b_tab;
574
575 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
576 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
577
c0c77734
DB
578 fprintf(ecbdata->file, "%s--- %s%s%s\n",
579 meta, ecbdata->label_path[0], reset, name_a_tab);
580 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
581 meta, ecbdata->label_path[1], reset, name_b_tab);
6973dcae
JH
582 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
583 }
cd112cef 584
a624eaa7
JM
585 if (diff_suppress_blank_empty
586 && len == 2 && line[0] == ' ' && line[1] == '\n') {
587 line[0] = '\n';
588 len = 1;
589 }
590
cd112cef
JS
591 /* This is not really necessary for now because
592 * this codepath only deals with two-way diffs.
593 */
594 for (i = 0; i < len && line[i] == '@'; i++)
595 ;
596 if (2 <= i && i < len && line[i] == ' ') {
597 ecbdata->nparents = i - 1;
23707811 598 len = sane_truncate_line(ecbdata, line, len);
c0c77734
DB
599 emit_line(ecbdata->file,
600 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
448c3ef1 601 reset, line, len);
23707811 602 if (line[len-1] != '\n')
c0c77734 603 putc('\n', ecbdata->file);
448c3ef1 604 return;
cd112cef 605 }
448c3ef1
JH
606
607 if (len < ecbdata->nparents) {
c0c77734 608 emit_line(ecbdata->file, reset, reset, line, len);
448c3ef1 609 return;
cd112cef 610 }
448c3ef1
JH
611
612 color = DIFF_PLAIN;
613 if (ecbdata->diff_words && ecbdata->nparents != 1)
614 /* fall back to normal diff */
615 free_diff_words_data(ecbdata);
616 if (ecbdata->diff_words) {
617 if (line[0] == '-') {
618 diff_words_append(line, len,
619 &ecbdata->diff_words->minus);
620 return;
621 } else if (line[0] == '+') {
622 diff_words_append(line, len,
623 &ecbdata->diff_words->plus);
624 return;
625 }
626 if (ecbdata->diff_words->minus.text.size ||
627 ecbdata->diff_words->plus.text.size)
628 diff_words_show(ecbdata->diff_words);
629 line++;
50f575fc 630 len--;
c0c77734 631 emit_line(ecbdata->file, plain, reset, line, len);
448c3ef1
JH
632 return;
633 }
634 for (i = 0; i < ecbdata->nparents && len; i++) {
635 if (line[i] == '-')
636 color = DIFF_FILE_OLD;
637 else if (line[i] == '+')
638 color = DIFF_FILE_NEW;
639 }
640
641 if (color != DIFF_FILE_NEW) {
c0c77734
DB
642 emit_line(ecbdata->file,
643 diff_get_color(ecbdata->color_diff, color),
448c3ef1
JH
644 reset, line, len);
645 return;
646 }
647 emit_add_line(reset, ecbdata, line, len);
6973dcae
JH
648}
649
650static char *pprint_rename(const char *a, const char *b)
651{
652 const char *old = a;
653 const char *new = b;
663af342 654 struct strbuf name;
6973dcae
JH
655 int pfx_length, sfx_length;
656 int len_a = strlen(a);
657 int len_b = strlen(b);
663af342 658 int a_midlen, b_midlen;
e5bfbf9b
AJ
659 int qlen_a = quote_c_style(a, NULL, NULL, 0);
660 int qlen_b = quote_c_style(b, NULL, NULL, 0);
661
663af342 662 strbuf_init(&name, 0);
e5bfbf9b 663 if (qlen_a || qlen_b) {
663af342
PH
664 quote_c_style(a, &name, NULL, 0);
665 strbuf_addstr(&name, " => ");
666 quote_c_style(b, &name, NULL, 0);
b315c5c0 667 return strbuf_detach(&name, NULL);
e5bfbf9b 668 }
6973dcae
JH
669
670 /* Find common prefix */
671 pfx_length = 0;
672 while (*old && *new && *old == *new) {
673 if (*old == '/')
674 pfx_length = old - a + 1;
675 old++;
676 new++;
677 }
678
679 /* Find common suffix */
680 old = a + len_a;
681 new = b + len_b;
682 sfx_length = 0;
683 while (a <= old && b <= new && *old == *new) {
684 if (*old == '/')
685 sfx_length = len_a - (old - a);
686 old--;
687 new--;
688 }
689
690 /*
691 * pfx{mid-a => mid-b}sfx
692 * {pfx-a => pfx-b}sfx
693 * pfx{sfx-a => sfx-b}
694 * name-a => name-b
695 */
663af342
PH
696 a_midlen = len_a - pfx_length - sfx_length;
697 b_midlen = len_b - pfx_length - sfx_length;
698 if (a_midlen < 0)
699 a_midlen = 0;
700 if (b_midlen < 0)
701 b_midlen = 0;
702
703 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
6973dcae 704 if (pfx_length + sfx_length) {
663af342
PH
705 strbuf_add(&name, a, pfx_length);
706 strbuf_addch(&name, '{');
6973dcae 707 }
663af342
PH
708 strbuf_add(&name, a + pfx_length, a_midlen);
709 strbuf_addstr(&name, " => ");
710 strbuf_add(&name, b + pfx_length, b_midlen);
711 if (pfx_length + sfx_length) {
712 strbuf_addch(&name, '}');
713 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
6973dcae 714 }
b315c5c0 715 return strbuf_detach(&name, NULL);
6973dcae
JH
716}
717
718struct diffstat_t {
6973dcae
JH
719 int nr;
720 int alloc;
721 struct diffstat_file {
f604652e 722 char *from_name;
6973dcae 723 char *name;
f604652e 724 char *print_name;
6973dcae
JH
725 unsigned is_unmerged:1;
726 unsigned is_binary:1;
727 unsigned is_renamed:1;
728 unsigned int added, deleted;
729 } **files;
730};
731
732static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
733 const char *name_a,
734 const char *name_b)
735{
736 struct diffstat_file *x;
737 x = xcalloc(sizeof (*x), 1);
738 if (diffstat->nr == diffstat->alloc) {
739 diffstat->alloc = alloc_nr(diffstat->alloc);
740 diffstat->files = xrealloc(diffstat->files,
741 diffstat->alloc * sizeof(x));
742 }
743 diffstat->files[diffstat->nr++] = x;
744 if (name_b) {
f604652e
JH
745 x->from_name = xstrdup(name_a);
746 x->name = xstrdup(name_b);
6973dcae
JH
747 x->is_renamed = 1;
748 }
f604652e
JH
749 else {
750 x->from_name = NULL;
9befac47 751 x->name = xstrdup(name_a);
f604652e 752 }
6973dcae
JH
753 return x;
754}
755
756static void diffstat_consume(void *priv, char *line, unsigned long len)
757{
758 struct diffstat_t *diffstat = priv;
759 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
760
761 if (line[0] == '+')
762 x->added++;
763 else if (line[0] == '-')
764 x->deleted++;
765}
766
698ce6f8 767const char mime_boundary_leader[] = "------------";
6973dcae 768
a2540023
JH
769static int scale_linear(int it, int width, int max_change)
770{
771 /*
3ed74e60
JS
772 * make sure that at least one '-' is printed if there were deletions,
773 * and likewise for '+'.
a2540023 774 */
3ed74e60
JS
775 if (max_change < 2)
776 return it;
777 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
a2540023
JH
778}
779
c0c77734
DB
780static void show_name(FILE *file,
781 const char *prefix, const char *name, int len,
785f7432 782 const char *reset, const char *set)
a2540023 783{
c0c77734 784 fprintf(file, " %s%s%-*s%s |", set, prefix, len, name, reset);
a2540023
JH
785}
786
c0c77734 787static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
a2540023
JH
788{
789 if (cnt <= 0)
790 return;
c0c77734 791 fprintf(file, "%s", set);
a2540023 792 while (cnt--)
c0c77734
DB
793 putc(ch, file);
794 fprintf(file, "%s", reset);
a2540023
JH
795}
796
f604652e
JH
797static void fill_print_name(struct diffstat_file *file)
798{
799 char *pname;
800
801 if (file->print_name)
802 return;
803
804 if (!file->is_renamed) {
805 struct strbuf buf;
806 strbuf_init(&buf, 0);
807 if (quote_c_style(file->name, &buf, NULL, 0)) {
808 pname = strbuf_detach(&buf, NULL);
809 } else {
810 pname = file->name;
811 strbuf_release(&buf);
812 }
813 } else {
814 pname = pprint_rename(file->from_name, file->name);
815 }
816 file->print_name = pname;
817}
818
a2540023 819static void show_stats(struct diffstat_t* data, struct diff_options *options)
6973dcae 820{
6973dcae 821 int i, len, add, del, total, adds = 0, dels = 0;
a2540023 822 int max_change = 0, max_len = 0;
6973dcae 823 int total_files = data->nr;
a2540023 824 int width, name_width;
785f7432 825 const char *reset, *set, *add_c, *del_c;
6973dcae
JH
826
827 if (data->nr == 0)
828 return;
829
a2540023
JH
830 width = options->stat_width ? options->stat_width : 80;
831 name_width = options->stat_name_width ? options->stat_name_width : 50;
832
833 /* Sanity: give at least 5 columns to the graph,
834 * but leave at least 10 columns for the name.
835 */
861d1af3
OM
836 if (width < 25)
837 width = 25;
838 if (name_width < 10)
839 name_width = 10;
840 else if (width < name_width + 15)
841 name_width = width - 15;
a2540023
JH
842
843 /* Find the longest filename and max number of changes */
8f67f8ae
PH
844 reset = diff_get_color_opt(options, DIFF_RESET);
845 set = diff_get_color_opt(options, DIFF_PLAIN);
846 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
847 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
785f7432 848
6973dcae
JH
849 for (i = 0; i < data->nr; i++) {
850 struct diffstat_file *file = data->files[i];
a2540023 851 int change = file->added + file->deleted;
f604652e
JH
852 fill_print_name(file);
853 len = strlen(file->print_name);
6973dcae
JH
854 if (max_len < len)
855 max_len = len;
856
857 if (file->is_binary || file->is_unmerged)
858 continue;
a2540023
JH
859 if (max_change < change)
860 max_change = change;
6973dcae
JH
861 }
862
a2540023
JH
863 /* Compute the width of the graph part;
864 * 10 is for one blank at the beginning of the line plus
865 * " | count " between the name and the graph.
866 *
867 * From here on, name_width is the width of the name area,
868 * and width is the width of the graph area.
869 */
870 name_width = (name_width < max_len) ? name_width : max_len;
871 if (width < (name_width + 10) + max_change)
872 width = width - (name_width + 10);
873 else
874 width = max_change;
875
6973dcae 876 for (i = 0; i < data->nr; i++) {
d2543b8e 877 const char *prefix = "";
f604652e 878 char *name = data->files[i]->print_name;
6973dcae
JH
879 int added = data->files[i]->added;
880 int deleted = data->files[i]->deleted;
a2540023 881 int name_len;
6973dcae
JH
882
883 /*
884 * "scale" the filename
885 */
a2540023
JH
886 len = name_width;
887 name_len = strlen(name);
888 if (name_width < name_len) {
6973dcae
JH
889 char *slash;
890 prefix = "...";
a2540023
JH
891 len -= 3;
892 name += name_len - len;
6973dcae
JH
893 slash = strchr(name, '/');
894 if (slash)
895 name = slash;
896 }
6973dcae
JH
897
898 if (data->files[i]->is_binary) {
c0c77734
DB
899 show_name(options->file, prefix, name, len, reset, set);
900 fprintf(options->file, " Bin ");
901 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
902 fprintf(options->file, " -> ");
903 fprintf(options->file, "%s%d%s", add_c, added, reset);
904 fprintf(options->file, " bytes");
905 fprintf(options->file, "\n");
f604652e 906 continue;
6973dcae
JH
907 }
908 else if (data->files[i]->is_unmerged) {
c0c77734
DB
909 show_name(options->file, prefix, name, len, reset, set);
910 fprintf(options->file, " Unmerged\n");
f604652e 911 continue;
6973dcae
JH
912 }
913 else if (!data->files[i]->is_renamed &&
914 (added + deleted == 0)) {
915 total_files--;
f604652e 916 continue;
6973dcae
JH
917 }
918
a2540023
JH
919 /*
920 * scale the add/delete
921 */
6973dcae
JH
922 add = added;
923 del = deleted;
924 total = add + del;
925 adds += add;
926 dels += del;
927
a2540023 928 if (width <= max_change) {
a2540023 929 add = scale_linear(add, width, max_change);
3ed74e60
JS
930 del = scale_linear(del, width, max_change);
931 total = add + del;
6973dcae 932 }
c0c77734 933 show_name(options->file, prefix, name, len, reset, set);
4d9b5359
JK
934 fprintf(options->file, "%5d%s", added + deleted,
935 added + deleted ? " " : "");
c0c77734
DB
936 show_graph(options->file, '+', add, add_c, reset);
937 show_graph(options->file, '-', del, del_c, reset);
938 fprintf(options->file, "\n");
939 }
940 fprintf(options->file,
941 "%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
785f7432 942 set, total_files, adds, dels, reset);
6973dcae
JH
943}
944
c0c77734 945static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
ebd124c6
NP
946{
947 int i, adds = 0, dels = 0, total_files = data->nr;
948
949 if (data->nr == 0)
950 return;
951
952 for (i = 0; i < data->nr; i++) {
953 if (!data->files[i]->is_binary &&
954 !data->files[i]->is_unmerged) {
955 int added = data->files[i]->added;
956 int deleted= data->files[i]->deleted;
957 if (!data->files[i]->is_renamed &&
958 (added + deleted == 0)) {
959 total_files--;
960 } else {
961 adds += added;
962 dels += deleted;
963 }
964 }
ebd124c6 965 }
c0c77734 966 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
ebd124c6
NP
967 total_files, adds, dels);
968}
969
74e2abe5
JH
970static void show_numstat(struct diffstat_t* data, struct diff_options *options)
971{
972 int i;
973
f604652e
JH
974 if (data->nr == 0)
975 return;
976
74e2abe5
JH
977 for (i = 0; i < data->nr; i++) {
978 struct diffstat_file *file = data->files[i];
979
bfddbc5e 980 if (file->is_binary)
c0c77734 981 fprintf(options->file, "-\t-\t");
bfddbc5e 982 else
c0c77734
DB
983 fprintf(options->file,
984 "%d\t%d\t", file->added, file->deleted);
f604652e
JH
985 if (options->line_termination) {
986 fill_print_name(file);
987 if (!file->is_renamed)
c0c77734 988 write_name_quoted(file->name, options->file,
f604652e
JH
989 options->line_termination);
990 else {
c0c77734
DB
991 fputs(file->print_name, options->file);
992 putc(options->line_termination, options->file);
f604652e 993 }
663af342 994 } else {
f604652e 995 if (file->is_renamed) {
c0c77734
DB
996 putc('\0', options->file);
997 write_name_quoted(file->from_name, options->file, '\0');
f604652e 998 }
c0c77734 999 write_name_quoted(file->name, options->file, '\0');
663af342 1000 }
74e2abe5
JH
1001 }
1002}
1003
c04a7155
JH
1004struct dirstat_file {
1005 const char *name;
1006 unsigned long changed;
7df7c019
LT
1007};
1008
c04a7155
JH
1009struct dirstat_dir {
1010 struct dirstat_file *files;
1011 int alloc, nr, percent, cumulative;
1012};
1013
1014static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
7df7c019
LT
1015{
1016 unsigned long this_dir = 0;
1017 unsigned int sources = 0;
1018
1019 while (dir->nr) {
c04a7155 1020 struct dirstat_file *f = dir->files;
7df7c019
LT
1021 int namelen = strlen(f->name);
1022 unsigned long this;
1023 char *slash;
1024
1025 if (namelen < baselen)
1026 break;
1027 if (memcmp(f->name, base, baselen))
1028 break;
1029 slash = strchr(f->name + baselen, '/');
1030 if (slash) {
1031 int newbaselen = slash + 1 - f->name;
c0c77734 1032 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
7df7c019
LT
1033 sources++;
1034 } else {
c04a7155 1035 this = f->changed;
7df7c019
LT
1036 dir->files++;
1037 dir->nr--;
1038 sources += 2;
1039 }
1040 this_dir += this;
1041 }
1042
1043 /*
1044 * We don't report dirstat's for
1045 * - the top level
1046 * - or cases where everything came from a single directory
1047 * under this directory (sources == 1).
1048 */
1049 if (baselen && sources != 1) {
1050 int permille = this_dir * 1000 / changed;
1051 if (permille) {
1052 int percent = permille / 10;
1053 if (percent >= dir->percent) {
c0c77734 1054 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
7df7c019
LT
1055 if (!dir->cumulative)
1056 return 0;
1057 }
1058 }
1059 }
1060 return this_dir;
1061}
1062
441bca0b
LT
1063static int dirstat_compare(const void *_a, const void *_b)
1064{
1065 const struct dirstat_file *a = _a;
1066 const struct dirstat_file *b = _b;
1067 return strcmp(a->name, b->name);
1068}
1069
c04a7155 1070static void show_dirstat(struct diff_options *options)
7df7c019
LT
1071{
1072 int i;
1073 unsigned long changed;
c04a7155
JH
1074 struct dirstat_dir dir;
1075 struct diff_queue_struct *q = &diff_queued_diff;
1076
1077 dir.files = NULL;
1078 dir.alloc = 0;
1079 dir.nr = 0;
1080 dir.percent = options->dirstat_percent;
f88d225f 1081 dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
7df7c019 1082
7df7c019 1083 changed = 0;
c04a7155
JH
1084 for (i = 0; i < q->nr; i++) {
1085 struct diff_filepair *p = q->queue[i];
1086 const char *name;
1087 unsigned long copied, added, damage;
1088
1089 name = p->one->path ? p->one->path : p->two->path;
1090
1091 if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
1092 diff_populate_filespec(p->one, 0);
1093 diff_populate_filespec(p->two, 0);
1094 diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
1095 &copied, &added);
1096 diff_free_filespec_data(p->one);
1097 diff_free_filespec_data(p->two);
1098 } else if (DIFF_FILE_VALID(p->one)) {
1099 diff_populate_filespec(p->one, 1);
1100 copied = added = 0;
1101 diff_free_filespec_data(p->one);
1102 } else if (DIFF_FILE_VALID(p->two)) {
1103 diff_populate_filespec(p->two, 1);
1104 copied = 0;
1105 added = p->two->size;
1106 diff_free_filespec_data(p->two);
1107 } else
2b0b551d 1108 continue;
c04a7155
JH
1109
1110 /*
1111 * Original minus copied is the removed material,
1112 * added is the new material. They are both damages
fd33777b
HO
1113 * made to the preimage. In --dirstat-by-file mode, count
1114 * damaged files, not damaged lines. This is done by
1115 * counting only a single damaged line per file.
c04a7155
JH
1116 */
1117 damage = (p->one->size - copied) + added;
fd33777b
HO
1118 if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
1119 damage = 1;
c04a7155
JH
1120
1121 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1122 dir.files[dir.nr].name = name;
1123 dir.files[dir.nr].changed = damage;
1124 changed += damage;
1125 dir.nr++;
7df7c019
LT
1126 }
1127
1128 /* This can happen even with many files, if everything was renames */
1129 if (!changed)
1130 return;
1131
1132 /* Show all directories with more than x% of the changes */
441bca0b 1133 qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
c0c77734 1134 gather_dirstat(options->file, &dir, changed, "", 0);
7df7c019
LT
1135}
1136
f604652e
JH
1137static void free_diffstat_info(struct diffstat_t *diffstat)
1138{
1139 int i;
1140 for (i = 0; i < diffstat->nr; i++) {
1141 struct diffstat_file *f = diffstat->files[i];
1142 if (f->name != f->print_name)
1143 free(f->print_name);
1144 free(f->name);
1145 free(f->from_name);
1146 free(f);
1147 }
1148 free(diffstat->files);
1149}
1150
88246898 1151struct checkdiff_t {
88246898 1152 const char *filename;
1ba111d1
JH
1153 int lineno;
1154 struct diff_options *o;
cf1b7869 1155 unsigned ws_rule;
62c64895 1156 unsigned status;
877f23cc 1157 int trailing_blanks_start;
88246898
JS
1158};
1159
04954043
JH
1160static int is_conflict_marker(const char *line, unsigned long len)
1161{
1162 char firstchar;
1163 int cnt;
1164
1165 if (len < 8)
1166 return 0;
1167 firstchar = line[0];
1168 switch (firstchar) {
1169 case '=': case '>': case '<':
1170 break;
1171 default:
1172 return 0;
1173 }
1174 for (cnt = 1; cnt < 7; cnt++)
1175 if (line[cnt] != firstchar)
1176 return 0;
1177 /* line[0] thru line[6] are same as firstchar */
1178 if (firstchar == '=') {
1179 /* divider between ours and theirs? */
1180 if (len != 8 || line[7] != '\n')
1181 return 0;
1182 } else if (len < 8 || !isspace(line[7])) {
1183 /* not divider before ours nor after theirs */
1184 return 0;
1185 }
1186 return 1;
1187}
1188
88246898
JS
1189static void checkdiff_consume(void *priv, char *line, unsigned long len)
1190{
1191 struct checkdiff_t *data = priv;
1ba111d1
JH
1192 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1193 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1194 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1195 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
c1795bb0 1196 char *err;
88246898
JS
1197
1198 if (line[0] == '+') {
18374e58 1199 unsigned bad;
0ef617f4 1200 data->lineno++;
877f23cc
JH
1201 if (!ws_blank_line(line + 1, len - 1, data->ws_rule))
1202 data->trailing_blanks_start = 0;
1203 else if (!data->trailing_blanks_start)
1204 data->trailing_blanks_start = data->lineno;
04954043
JH
1205 if (is_conflict_marker(line + 1, len - 1)) {
1206 data->status |= 1;
1207 fprintf(data->o->file,
1208 "%s:%d: leftover conflict marker\n",
1209 data->filename, data->lineno);
1210 }
8f8841e9 1211 bad = ws_check(line + 1, len - 1, data->ws_rule);
18374e58 1212 if (!bad)
c1795bb0 1213 return;
18374e58
JH
1214 data->status |= bad;
1215 err = whitespace_error_string(bad);
1ba111d1
JH
1216 fprintf(data->o->file, "%s:%d: %s.\n",
1217 data->filename, data->lineno, err);
c1795bb0 1218 free(err);
1ba111d1 1219 emit_line(data->o->file, set, reset, line, 1);
8f8841e9 1220 ws_check_emit(line + 1, len - 1, data->ws_rule,
1ba111d1 1221 data->o->file, set, reset, ws);
877f23cc 1222 } else if (line[0] == ' ') {
88246898 1223 data->lineno++;
877f23cc
JH
1224 data->trailing_blanks_start = 0;
1225 } else if (line[0] == '@') {
88246898
JS
1226 char *plus = strchr(line, '+');
1227 if (plus)
0ef617f4 1228 data->lineno = strtol(plus, NULL, 10) - 1;
88246898
JS
1229 else
1230 die("invalid diff");
877f23cc 1231 data->trailing_blanks_start = 0;
88246898
JS
1232 }
1233}
1234
0660626c
JH
1235static unsigned char *deflate_it(char *data,
1236 unsigned long size,
1237 unsigned long *result_size)
051308f6 1238{
0660626c
JH
1239 int bound;
1240 unsigned char *deflated;
1241 z_stream stream;
1242
1243 memset(&stream, 0, sizeof(stream));
12f6c308 1244 deflateInit(&stream, zlib_compression_level);
0660626c
JH
1245 bound = deflateBound(&stream, size);
1246 deflated = xmalloc(bound);
1247 stream.next_out = deflated;
1248 stream.avail_out = bound;
1249
1250 stream.next_in = (unsigned char *)data;
1251 stream.avail_in = size;
1252 while (deflate(&stream, Z_FINISH) == Z_OK)
1253 ; /* nothing */
1254 deflateEnd(&stream);
1255 *result_size = stream.total_out;
1256 return deflated;
051308f6
JH
1257}
1258
c0c77734 1259static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
051308f6 1260{
0660626c
JH
1261 void *cp;
1262 void *delta;
1263 void *deflated;
1264 void *data;
1265 unsigned long orig_size;
1266 unsigned long delta_size;
1267 unsigned long deflate_size;
1268 unsigned long data_size;
051308f6 1269
0660626c
JH
1270 /* We could do deflated delta, or we could do just deflated two,
1271 * whichever is smaller.
051308f6 1272 */
0660626c
JH
1273 delta = NULL;
1274 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1275 if (one->size && two->size) {
1276 delta = diff_delta(one->ptr, one->size,
1277 two->ptr, two->size,
1278 &delta_size, deflate_size);
1279 if (delta) {
1280 void *to_free = delta;
1281 orig_size = delta_size;
1282 delta = deflate_it(delta, delta_size, &delta_size);
1283 free(to_free);
051308f6
JH
1284 }
1285 }
051308f6 1286
0660626c 1287 if (delta && delta_size < deflate_size) {
c0c77734 1288 fprintf(file, "delta %lu\n", orig_size);
0660626c
JH
1289 free(deflated);
1290 data = delta;
1291 data_size = delta_size;
1292 }
1293 else {
c0c77734 1294 fprintf(file, "literal %lu\n", two->size);
0660626c
JH
1295 free(delta);
1296 data = deflated;
1297 data_size = deflate_size;
1298 }
051308f6 1299
0660626c
JH
1300 /* emit data encoded in base85 */
1301 cp = data;
1302 while (data_size) {
1303 int bytes = (52 < data_size) ? 52 : data_size;
051308f6 1304 char line[70];
0660626c 1305 data_size -= bytes;
051308f6
JH
1306 if (bytes <= 26)
1307 line[0] = bytes + 'A' - 1;
1308 else
1309 line[0] = bytes - 26 + 'a' - 1;
1310 encode_85(line + 1, cp, bytes);
1d7f171c 1311 cp = (char *) cp + bytes;
c0c77734
DB
1312 fputs(line, file);
1313 fputc('\n', file);
051308f6 1314 }
c0c77734 1315 fprintf(file, "\n");
0660626c 1316 free(data);
051308f6
JH
1317}
1318
c0c77734 1319static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
d4c452f0 1320{
c0c77734
DB
1321 fprintf(file, "GIT binary patch\n");
1322 emit_binary_diff_body(file, one, two);
1323 emit_binary_diff_body(file, two, one);
d4c452f0
JH
1324}
1325
8c701249
JH
1326static void setup_diff_attr_check(struct git_attr_check *check)
1327{
1328 static struct git_attr *attr_diff;
1329
29a3eefd 1330 if (!attr_diff) {
8c701249 1331 attr_diff = git_attr("diff", 4);
29a3eefd
JH
1332 }
1333 check[0].attr = attr_diff;
8c701249
JH
1334}
1335
29a3eefd 1336static void diff_filespec_check_attr(struct diff_filespec *one)
6973dcae 1337{
e0e324a4 1338 struct git_attr_check attr_diff_check;
2c3fa66f 1339 int check_from_data = 0;
8c701249 1340
29a3eefd
JH
1341 if (one->checked_attr)
1342 return;
1343
e0e324a4 1344 setup_diff_attr_check(&attr_diff_check);
29a3eefd 1345 one->is_binary = 0;
e0e324a4 1346 one->funcname_pattern_ident = NULL;
29a3eefd 1347
e0e324a4 1348 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
29a3eefd
JH
1349 const char *value;
1350
1351 /* binaryness */
e0e324a4 1352 value = attr_diff_check.value;
515106fa 1353 if (ATTR_TRUE(value))
29a3eefd 1354 ;
515106fa 1355 else if (ATTR_FALSE(value))
29a3eefd 1356 one->is_binary = 1;
2c3fa66f
JH
1357 else
1358 check_from_data = 1;
f258475a 1359
e0e324a4 1360 /* funcname pattern ident */
f258475a
JH
1361 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1362 ;
1363 else
e0e324a4 1364 one->funcname_pattern_ident = value;
515106fa 1365 }
40250af4 1366
2c3fa66f
JH
1367 if (check_from_data) {
1368 if (!one->data && DIFF_FILE_VALID(one))
1369 diff_populate_filespec(one, 0);
29a3eefd 1370
2c3fa66f
JH
1371 if (one->data)
1372 one->is_binary = buffer_is_binary(one->data, one->size);
1373 }
29a3eefd
JH
1374}
1375
1376int diff_filespec_is_binary(struct diff_filespec *one)
1377{
1378 diff_filespec_check_attr(one);
1379 return one->is_binary;
6973dcae
JH
1380}
1381
e0e324a4 1382static const char *funcname_pattern(const char *ident)
f258475a 1383{
e0e324a4 1384 struct funcname_pattern *pp;
f258475a 1385
e0e324a4
JH
1386 for (pp = funcname_pattern_list; pp; pp = pp->next)
1387 if (!strcmp(ident, pp->name))
1388 return pp->pattern;
f258475a
JH
1389 return NULL;
1390}
1391
d3a93dc9
JH
1392static struct builtin_funcname_pattern {
1393 const char *name;
1394 const char *pattern;
1395} builtin_funcname_pattern[] = {
1a1fcf4a
JH
1396 { "bibtex", "\\(@[a-zA-Z]\\{1,\\}[ \t]*{\\{0,1\\}[ \t]*[^ \t\"@',\\#}{~%]*\\).*$" },
1397 { "html", "^\\s*\\(<[Hh][1-6]\\s.*>.*\\)$" },
d3a93dc9
JH
1398 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1399 "new\\|return\\|switch\\|throw\\|while\\)\n"
1400 "^[ ]*\\(\\([ ]*"
1401 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
14a5c7c1 1402 "[ ]*([^;]*\\)$" },
b50005b7
AP
1403 { "pascal", "^\\(\\(procedure\\|function\\|constructor\\|"
1404 "destructor\\|interface\\|implementation\\|"
1405 "initialization\\|finalization\\)[ \t]*.*\\)$"
1406 "\\|"
1407 "^\\(.*=[ \t]*\\(class\\|record\\).*\\)$"
1408 },
7c17205b 1409 { "python", "^\\s*\\(\\(class\\|def\\)\\s.*\\)$" },
ad8c1d92 1410 { "ruby", "^\\s*\\(\\(class\\|module\\|def\\)\\s.*\\)$" },
1a1fcf4a 1411 { "tex", "^\\(\\\\\\(\\(sub\\)*section\\|chapter\\|part\\)\\*\\{0,1\\}{.*\\)$" },
d3a93dc9
JH
1412};
1413
e0e324a4 1414static const char *diff_funcname_pattern(struct diff_filespec *one)
f258475a 1415{
e0e324a4 1416 const char *ident, *pattern;
d3a93dc9 1417 int i;
f258475a
JH
1418
1419 diff_filespec_check_attr(one);
e0e324a4 1420 ident = one->funcname_pattern_ident;
f258475a
JH
1421
1422 if (!ident)
1423 /*
1424 * If the config file has "funcname.default" defined, that
1425 * regexp is used; otherwise NULL is returned and xemit uses
1426 * the built-in default.
1427 */
e0e324a4 1428 return funcname_pattern("default");
f258475a
JH
1429
1430 /* Look up custom "funcname.$ident" regexp from config. */
e0e324a4
JH
1431 pattern = funcname_pattern(ident);
1432 if (pattern)
1433 return pattern;
f258475a
JH
1434
1435 /*
1436 * And define built-in fallback patterns here. Note that
9f6fe822 1437 * these can be overridden by the user's config settings.
f258475a 1438 */
d3a93dc9
JH
1439 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1440 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1441 return builtin_funcname_pattern[i].pattern;
f258475a
JH
1442
1443 return NULL;
1444}
1445
6973dcae
JH
1446static void builtin_diff(const char *name_a,
1447 const char *name_b,
1448 struct diff_filespec *one,
1449 struct diff_filespec *two,
1450 const char *xfrm_msg,
051308f6 1451 struct diff_options *o,
6973dcae
JH
1452 int complete_rewrite)
1453{
1454 mmfile_t mf1, mf2;
1455 const char *lbl[2];
1456 char *a_one, *b_two;
8f67f8ae
PH
1457 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1458 const char *reset = diff_get_color_opt(o, DIFF_RESET);
6973dcae 1459
eab9a40b
JS
1460 a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
1461 b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
6973dcae
JH
1462 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1463 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
c0c77734 1464 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
6973dcae
JH
1465 if (lbl[0][0] == '/') {
1466 /* /dev/null */
c0c77734 1467 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
50f575fc 1468 if (xfrm_msg && xfrm_msg[0])
c0c77734 1469 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1470 }
1471 else if (lbl[1][0] == '/') {
c0c77734 1472 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
50f575fc 1473 if (xfrm_msg && xfrm_msg[0])
c0c77734 1474 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1475 }
1476 else {
1477 if (one->mode != two->mode) {
c0c77734
DB
1478 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1479 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
cd112cef 1480 }
50f575fc 1481 if (xfrm_msg && xfrm_msg[0])
c0c77734 1482 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1483 /*
1484 * we do not run diff between different kind
1485 * of objects.
1486 */
1487 if ((one->mode ^ two->mode) & S_IFMT)
1488 goto free_ab_and_return;
1489 if (complete_rewrite) {
eab9a40b 1490 emit_rewrite_diff(name_a, name_b, one, two, o);
34a5e1a2 1491 o->found_changes = 1;
6973dcae
JH
1492 goto free_ab_and_return;
1493 }
1494 }
1495
1496 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1497 die("unable to read files to diff");
1498
8f67f8ae 1499 if (!DIFF_OPT_TST(o, TEXT) &&
29a3eefd 1500 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
0660626c
JH
1501 /* Quite common confusing case */
1502 if (mf1.size == mf2.size &&
1503 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1504 goto free_ab_and_return;
8f67f8ae 1505 if (DIFF_OPT_TST(o, BINARY))
c0c77734 1506 emit_binary_diff(o->file, &mf1, &mf2);
051308f6 1507 else
c0c77734
DB
1508 fprintf(o->file, "Binary files %s and %s differ\n",
1509 lbl[0], lbl[1]);
34a5e1a2 1510 o->found_changes = 1;
051308f6 1511 }
6973dcae
JH
1512 else {
1513 /* Crazy xdl interfaces.. */
1514 const char *diffopts = getenv("GIT_DIFF_OPTS");
1515 xpparam_t xpp;
1516 xdemitconf_t xecfg;
1517 xdemitcb_t ecb;
1518 struct emit_callback ecbdata;
e0e324a4 1519 const char *funcname_pattern;
f258475a 1520
e0e324a4
JH
1521 funcname_pattern = diff_funcname_pattern(one);
1522 if (!funcname_pattern)
1523 funcname_pattern = diff_funcname_pattern(two);
6973dcae 1524
30b25010 1525 memset(&xecfg, 0, sizeof(xecfg));
cd112cef 1526 memset(&ecbdata, 0, sizeof(ecbdata));
6973dcae 1527 ecbdata.label_path = lbl;
8f67f8ae 1528 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
34a5e1a2 1529 ecbdata.found_changesp = &o->found_changes;
cf1b7869 1530 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
c0c77734 1531 ecbdata.file = o->file;
0d21efa5 1532 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
ee1e5412 1533 xecfg.ctxlen = o->context;
6973dcae 1534 xecfg.flags = XDL_EMIT_FUNCNAMES;
e0e324a4
JH
1535 if (funcname_pattern)
1536 xdiff_set_find_func(&xecfg, funcname_pattern);
6973dcae
JH
1537 if (!diffopts)
1538 ;
cc44c765 1539 else if (!prefixcmp(diffopts, "--unified="))
6973dcae 1540 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
cc44c765 1541 else if (!prefixcmp(diffopts, "-u"))
6973dcae 1542 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
c0c77734 1543 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
f59a59e2
JS
1544 ecbdata.diff_words =
1545 xcalloc(1, sizeof(struct diff_words_data));
c0c77734
DB
1546 ecbdata.diff_words->file = o->file;
1547 }
8a3f524b
JH
1548 xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
1549 &xpp, &xecfg, &ecb);
8f67f8ae 1550 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
f59a59e2 1551 free_diff_words_data(&ecbdata);
6973dcae
JH
1552 }
1553
1554 free_ab_and_return:
fc3abdf5
JH
1555 diff_free_filespec_data(one);
1556 diff_free_filespec_data(two);
6973dcae
JH
1557 free(a_one);
1558 free(b_two);
1559 return;
1560}
1561
1562static void builtin_diffstat(const char *name_a, const char *name_b,
1563 struct diff_filespec *one,
1564 struct diff_filespec *two,
710158e3 1565 struct diffstat_t *diffstat,
0d21efa5 1566 struct diff_options *o,
710158e3 1567 int complete_rewrite)
6973dcae
JH
1568{
1569 mmfile_t mf1, mf2;
1570 struct diffstat_file *data;
1571
1572 data = diffstat_add(diffstat, name_a, name_b);
1573
1574 if (!one || !two) {
1575 data->is_unmerged = 1;
1576 return;
1577 }
710158e3
JH
1578 if (complete_rewrite) {
1579 diff_populate_filespec(one, 0);
1580 diff_populate_filespec(two, 0);
1581 data->deleted = count_lines(one->data, one->size);
1582 data->added = count_lines(two->data, two->size);
fc3abdf5 1583 goto free_and_return;
710158e3 1584 }
6973dcae
JH
1585 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1586 die("unable to read files to diff");
1587
29a3eefd 1588 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
6973dcae 1589 data->is_binary = 1;
b1882587
AP
1590 data->added = mf2.size;
1591 data->deleted = mf1.size;
1592 } else {
6973dcae
JH
1593 /* Crazy xdl interfaces.. */
1594 xpparam_t xpp;
1595 xdemitconf_t xecfg;
1596 xdemitcb_t ecb;
1597
30b25010 1598 memset(&xecfg, 0, sizeof(xecfg));
0d21efa5 1599 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
8a3f524b
JH
1600 xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
1601 &xpp, &xecfg, &ecb);
6973dcae 1602 }
fc3abdf5
JH
1603
1604 free_and_return:
1605 diff_free_filespec_data(one);
1606 diff_free_filespec_data(two);
6973dcae
JH
1607}
1608
88246898 1609static void builtin_checkdiff(const char *name_a, const char *name_b,
cd676a51 1610 const char *attr_path,
5ff10dd6
JH
1611 struct diff_filespec *one,
1612 struct diff_filespec *two,
1613 struct diff_options *o)
88246898
JS
1614{
1615 mmfile_t mf1, mf2;
1616 struct checkdiff_t data;
1617
1618 if (!two)
1619 return;
1620
1621 memset(&data, 0, sizeof(data));
88246898
JS
1622 data.filename = name_b ? name_b : name_a;
1623 data.lineno = 0;
1ba111d1 1624 data.o = o;
cd676a51 1625 data.ws_rule = whitespace_rule(attr_path);
88246898
JS
1626
1627 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1628 die("unable to read files to diff");
1629
5ff10dd6
JH
1630 /*
1631 * All the other codepaths check both sides, but not checking
1632 * the "old" side here is deliberate. We are checking the newly
1633 * introduced changes, and as long as the "new" side is text, we
1634 * can and should check what it introduces.
1635 */
29a3eefd 1636 if (diff_filespec_is_binary(two))
fc3abdf5 1637 goto free_and_return;
88246898
JS
1638 else {
1639 /* Crazy xdl interfaces.. */
1640 xpparam_t xpp;
1641 xdemitconf_t xecfg;
1642 xdemitcb_t ecb;
1643
30b25010 1644 memset(&xecfg, 0, sizeof(xecfg));
c35539eb 1645 xecfg.ctxlen = 1; /* at least one context line */
88246898 1646 xpp.flags = XDF_NEED_MINIMAL;
8a3f524b
JH
1647 xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
1648 &xpp, &xecfg, &ecb);
877f23cc 1649
04c6e9e9
JH
1650 if ((data.ws_rule & WS_TRAILING_SPACE) &&
1651 data.trailing_blanks_start) {
877f23cc
JH
1652 fprintf(o->file, "%s:%d: ends with blank lines.\n",
1653 data.filename, data.trailing_blanks_start);
1654 data.status = 1; /* report errors */
1655 }
88246898 1656 }
fc3abdf5
JH
1657 free_and_return:
1658 diff_free_filespec_data(one);
1659 diff_free_filespec_data(two);
62c64895
WC
1660 if (data.status)
1661 DIFF_OPT_SET(o, CHECK_FAILED);
88246898
JS
1662}
1663
6973dcae
JH
1664struct diff_filespec *alloc_filespec(const char *path)
1665{
1666 int namelen = strlen(path);
1667 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1668
1669 memset(spec, 0, sizeof(*spec));
1670 spec->path = (char *)(spec + 1);
1671 memcpy(spec->path, path, namelen+1);
9fb88419 1672 spec->count = 1;
6973dcae
JH
1673 return spec;
1674}
1675
9fb88419
LT
1676void free_filespec(struct diff_filespec *spec)
1677{
1678 if (!--spec->count) {
1679 diff_free_filespec_data(spec);
1680 free(spec);
1681 }
1682}
1683
6973dcae
JH
1684void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1685 unsigned short mode)
1686{
1687 if (mode) {
1688 spec->mode = canon_mode(mode);
e702496e 1689 hashcpy(spec->sha1, sha1);
0bef57ee 1690 spec->sha1_valid = !is_null_sha1(sha1);
6973dcae
JH
1691 }
1692}
1693
1694/*
5adf317b 1695 * Given a name and sha1 pair, if the index tells us the file in
6973dcae
JH
1696 * the work tree has that object contents, return true, so that
1697 * prepare_temp_file() does not have to inflate and extract.
1698 */
1510fea7 1699static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
6973dcae
JH
1700{
1701 struct cache_entry *ce;
1702 struct stat st;
1703 int pos, len;
1704
1705 /* We do not read the cache ourselves here, because the
1706 * benchmark with my previous version that always reads cache
1707 * shows that it makes things worse for diff-tree comparing
1708 * two linux-2.6 kernel trees in an already checked out work
1709 * tree. This is because most diff-tree comparisons deal with
1710 * only a small number of files, while reading the cache is
1711 * expensive for a large project, and its cost outweighs the
1712 * savings we get by not inflating the object to a temporary
1713 * file. Practically, this code only helps when we are used
1714 * by diff-cache --cached, which does read the cache before
1715 * calling us.
1716 */
1717 if (!active_cache)
1718 return 0;
1719
1510fea7
SP
1720 /* We want to avoid the working directory if our caller
1721 * doesn't need the data in a normal file, this system
1722 * is rather slow with its stat/open/mmap/close syscalls,
1723 * and the object is contained in a pack file. The pack
1724 * is probably already open and will be faster to obtain
1725 * the data through than the working directory. Loose
1726 * objects however would tend to be slower as they need
1727 * to be individually opened and inflated.
1728 */
5caf9232 1729 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1510fea7
SP
1730 return 0;
1731
6973dcae
JH
1732 len = strlen(name);
1733 pos = cache_name_pos(name, len);
1734 if (pos < 0)
1735 return 0;
1736 ce = active_cache[pos];
eadb5831
JH
1737
1738 /*
1739 * This is not the sha1 we are looking for, or
1740 * unreusable because it is not a regular file.
1741 */
1742 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
6973dcae 1743 return 0;
eadb5831
JH
1744
1745 /*
1746 * If ce matches the file in the work tree, we can reuse it.
6973dcae 1747 */
eadb5831
JH
1748 if (ce_uptodate(ce) ||
1749 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1750 return 1;
1751
1752 return 0;
6973dcae
JH
1753}
1754
3afaa72d
JH
1755static int populate_from_stdin(struct diff_filespec *s)
1756{
af6eb822 1757 struct strbuf buf;
c32f749f 1758 size_t size = 0;
af6eb822 1759
f1696ee3
PH
1760 strbuf_init(&buf, 0);
1761 if (strbuf_read(&buf, 0, 0) < 0)
af6eb822 1762 return error("error while reading from stdin %s",
3afaa72d 1763 strerror(errno));
af6eb822 1764
3afaa72d 1765 s->should_munmap = 0;
c32f749f
RS
1766 s->data = strbuf_detach(&buf, &size);
1767 s->size = size;
3afaa72d
JH
1768 s->should_free = 1;
1769 return 0;
1770}
1771
04786756
LT
1772static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1773{
1774 int len;
1775 char *data = xmalloc(100);
1776 len = snprintf(data, 100,
1777 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1778 s->data = data;
1779 s->size = len;
1780 s->should_free = 1;
1781 if (size_only) {
1782 s->data = NULL;
1783 free(data);
1784 }
1785 return 0;
1786}
1787
6973dcae
JH
1788/*
1789 * While doing rename detection and pickaxe operation, we may need to
1790 * grab the data for the blob (or file) for our own in-core comparison.
1791 * diff_filespec has data and size fields for this purpose.
1792 */
1793int diff_populate_filespec(struct diff_filespec *s, int size_only)
1794{
1795 int err = 0;
1796 if (!DIFF_FILE_VALID(s))
1797 die("internal error: asking to populate invalid file.");
1798 if (S_ISDIR(s->mode))
1799 return -1;
1800
6973dcae 1801 if (s->data)
fc3abdf5 1802 return 0;
04786756 1803
6e0b8ed6
JH
1804 if (size_only && 0 < s->size)
1805 return 0;
1806
302b9282 1807 if (S_ISGITLINK(s->mode))
04786756
LT
1808 return diff_populate_gitlink(s, size_only);
1809
6973dcae 1810 if (!s->sha1_valid ||
1510fea7 1811 reuse_worktree_file(s->path, s->sha1, 0)) {
5ecd293d 1812 struct strbuf buf;
6973dcae
JH
1813 struct stat st;
1814 int fd;
6c510bee 1815
3afaa72d
JH
1816 if (!strcmp(s->path, "-"))
1817 return populate_from_stdin(s);
1818
6973dcae
JH
1819 if (lstat(s->path, &st) < 0) {
1820 if (errno == ENOENT) {
1821 err_empty:
1822 err = -1;
1823 empty:
d2543b8e 1824 s->data = (char *)"";
6973dcae
JH
1825 s->size = 0;
1826 return err;
1827 }
1828 }
dc49cd76 1829 s->size = xsize_t(st.st_size);
6973dcae
JH
1830 if (!s->size)
1831 goto empty;
1832 if (size_only)
1833 return 0;
1834 if (S_ISLNK(st.st_mode)) {
1835 int ret;
1836 s->data = xmalloc(s->size);
1837 s->should_free = 1;
1838 ret = readlink(s->path, s->data, s->size);
1839 if (ret < 0) {
1840 free(s->data);
1841 goto err_empty;
1842 }
1843 return 0;
1844 }
1845 fd = open(s->path, O_RDONLY);
1846 if (fd < 0)
1847 goto err_empty;
c4712e45 1848 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 1849 close(fd);
6973dcae 1850 s->should_munmap = 1;
6c510bee
LT
1851
1852 /*
1853 * Convert from working tree format to canonical git format
1854 */
5ecd293d 1855 strbuf_init(&buf, 0);
21e5ad50 1856 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
c32f749f 1857 size_t size = 0;
6c510bee
LT
1858 munmap(s->data, s->size);
1859 s->should_munmap = 0;
c32f749f
RS
1860 s->data = strbuf_detach(&buf, &size);
1861 s->size = size;
6c510bee
LT
1862 s->should_free = 1;
1863 }
6973dcae
JH
1864 }
1865 else {
21666f1a 1866 enum object_type type;
6e0b8ed6 1867 if (size_only)
21666f1a 1868 type = sha1_object_info(s->sha1, &s->size);
6973dcae 1869 else {
21666f1a 1870 s->data = read_sha1_file(s->sha1, &type, &s->size);
6973dcae
JH
1871 s->should_free = 1;
1872 }
1873 }
1874 return 0;
1875}
1876
8ae92e63 1877void diff_free_filespec_blob(struct diff_filespec *s)
6973dcae
JH
1878{
1879 if (s->should_free)
1880 free(s->data);
1881 else if (s->should_munmap)
1882 munmap(s->data, s->size);
fc3abdf5
JH
1883
1884 if (s->should_free || s->should_munmap) {
1885 s->should_free = s->should_munmap = 0;
1886 s->data = NULL;
1887 }
eede7b7d
JK
1888}
1889
1890void diff_free_filespec_data(struct diff_filespec *s)
1891{
8ae92e63 1892 diff_free_filespec_blob(s);
6973dcae
JH
1893 free(s->cnt_data);
1894 s->cnt_data = NULL;
1895}
1896
1897static void prep_temp_blob(struct diff_tempfile *temp,
1898 void *blob,
1899 unsigned long size,
1900 const unsigned char *sha1,
1901 int mode)
1902{
1903 int fd;
1904
1472966c 1905 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
6973dcae 1906 if (fd < 0)
e7a7be88 1907 die("unable to create temp-file: %s", strerror(errno));
93822c22 1908 if (write_in_full(fd, blob, size) != size)
6973dcae
JH
1909 die("unable to write temp-file");
1910 close(fd);
1911 temp->name = temp->tmp_path;
1912 strcpy(temp->hex, sha1_to_hex(sha1));
1913 temp->hex[40] = 0;
1914 sprintf(temp->mode, "%06o", mode);
1915}
1916
1917static void prepare_temp_file(const char *name,
1918 struct diff_tempfile *temp,
1919 struct diff_filespec *one)
1920{
1921 if (!DIFF_FILE_VALID(one)) {
1922 not_a_valid_file:
1923 /* A '-' entry produces this for file-2, and
1924 * a '+' entry produces this for file-1.
1925 */
1926 temp->name = "/dev/null";
1927 strcpy(temp->hex, ".");
1928 strcpy(temp->mode, ".");
1929 return;
1930 }
1931
1932 if (!one->sha1_valid ||
1510fea7 1933 reuse_worktree_file(name, one->sha1, 1)) {
6973dcae
JH
1934 struct stat st;
1935 if (lstat(name, &st) < 0) {
1936 if (errno == ENOENT)
1937 goto not_a_valid_file;
1938 die("stat(%s): %s", name, strerror(errno));
1939 }
1940 if (S_ISLNK(st.st_mode)) {
1941 int ret;
1942 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
dc49cd76 1943 size_t sz = xsize_t(st.st_size);
6973dcae
JH
1944 if (sizeof(buf) <= st.st_size)
1945 die("symlink too long: %s", name);
dc49cd76 1946 ret = readlink(name, buf, sz);
6973dcae
JH
1947 if (ret < 0)
1948 die("readlink(%s)", name);
dc49cd76 1949 prep_temp_blob(temp, buf, sz,
6973dcae
JH
1950 (one->sha1_valid ?
1951 one->sha1 : null_sha1),
1952 (one->sha1_valid ?
1953 one->mode : S_IFLNK));
1954 }
1955 else {
1956 /* we can borrow from the file in the work tree */
1957 temp->name = name;
1958 if (!one->sha1_valid)
1959 strcpy(temp->hex, sha1_to_hex(null_sha1));
1960 else
1961 strcpy(temp->hex, sha1_to_hex(one->sha1));
1962 /* Even though we may sometimes borrow the
1963 * contents from the work tree, we always want
1964 * one->mode. mode is trustworthy even when
1965 * !(one->sha1_valid), as long as
1966 * DIFF_FILE_VALID(one).
1967 */
1968 sprintf(temp->mode, "%06o", one->mode);
1969 }
1970 return;
1971 }
1972 else {
1973 if (diff_populate_filespec(one, 0))
1974 die("cannot read data blob for %s", one->path);
1975 prep_temp_blob(temp, one->data, one->size,
1976 one->sha1, one->mode);
1977 }
1978}
1979
1980static void remove_tempfile(void)
1981{
1982 int i;
1983
1984 for (i = 0; i < 2; i++)
1985 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1986 unlink(diff_temp[i].name);
1987 diff_temp[i].name = NULL;
1988 }
1989}
1990
1991static void remove_tempfile_on_signal(int signo)
1992{
1993 remove_tempfile();
1994 signal(SIGINT, SIG_DFL);
1995 raise(signo);
1996}
1997
6973dcae
JH
1998/* An external diff command takes:
1999 *
2000 * diff-cmd name infile1 infile1-sha1 infile1-mode \
2001 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2002 *
2003 */
2004static void run_external_diff(const char *pgm,
2005 const char *name,
2006 const char *other,
2007 struct diff_filespec *one,
2008 struct diff_filespec *two,
2009 const char *xfrm_msg,
2010 int complete_rewrite)
2011{
2012 const char *spawn_arg[10];
2013 struct diff_tempfile *temp = diff_temp;
2014 int retval;
2015 static int atexit_asked = 0;
2016 const char *othername;
2017 const char **arg = &spawn_arg[0];
2018
2019 othername = (other? other : name);
2020 if (one && two) {
2021 prepare_temp_file(name, &temp[0], one);
2022 prepare_temp_file(othername, &temp[1], two);
2023 if (! atexit_asked &&
2024 (temp[0].name == temp[0].tmp_path ||
2025 temp[1].name == temp[1].tmp_path)) {
2026 atexit_asked = 1;
2027 atexit(remove_tempfile);
2028 }
2029 signal(SIGINT, remove_tempfile_on_signal);
2030 }
2031
2032 if (one && two) {
2033 *arg++ = pgm;
2034 *arg++ = name;
2035 *arg++ = temp[0].name;
2036 *arg++ = temp[0].hex;
2037 *arg++ = temp[0].mode;
2038 *arg++ = temp[1].name;
2039 *arg++ = temp[1].hex;
2040 *arg++ = temp[1].mode;
2041 if (other) {
2042 *arg++ = other;
2043 *arg++ = xfrm_msg;
2044 }
2045 } else {
2046 *arg++ = pgm;
2047 *arg++ = name;
2048 }
2049 *arg = NULL;
d5535ec7
JS
2050 fflush(NULL);
2051 retval = run_command_v_opt(spawn_arg, 0);
6973dcae
JH
2052 remove_tempfile();
2053 if (retval) {
2054 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2055 exit(1);
2056 }
2057}
2058
f1af60bd
JH
2059static const char *external_diff_attr(const char *name)
2060{
2061 struct git_attr_check attr_diff_check;
2062
cd676a51
JH
2063 if (!name)
2064 return NULL;
2065
f1af60bd
JH
2066 setup_diff_attr_check(&attr_diff_check);
2067 if (!git_checkattr(name, 1, &attr_diff_check)) {
2068 const char *value = attr_diff_check.value;
2069 if (!ATTR_TRUE(value) &&
2070 !ATTR_FALSE(value) &&
2071 !ATTR_UNSET(value)) {
2072 struct ll_diff_driver *drv;
2073
f1af60bd
JH
2074 for (drv = user_diff; drv; drv = drv->next)
2075 if (!strcmp(drv->name, value))
2076 return drv->cmd;
2077 }
2078 }
2079 return NULL;
2080}
2081
6973dcae
JH
2082static void run_diff_cmd(const char *pgm,
2083 const char *name,
2084 const char *other,
cd676a51 2085 const char *attr_path,
6973dcae
JH
2086 struct diff_filespec *one,
2087 struct diff_filespec *two,
2088 const char *xfrm_msg,
051308f6 2089 struct diff_options *o,
6973dcae
JH
2090 int complete_rewrite)
2091{
8f67f8ae 2092 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
f1af60bd
JH
2093 pgm = NULL;
2094 else {
cd676a51 2095 const char *cmd = external_diff_attr(attr_path);
f1af60bd
JH
2096 if (cmd)
2097 pgm = cmd;
2098 }
2099
6973dcae
JH
2100 if (pgm) {
2101 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2102 complete_rewrite);
2103 return;
2104 }
2105 if (one && two)
2106 builtin_diff(name, other ? other : name,
051308f6 2107 one, two, xfrm_msg, o, complete_rewrite);
6973dcae 2108 else
c0c77734 2109 fprintf(o->file, "* Unmerged path %s\n", name);
6973dcae
JH
2110}
2111
2112static void diff_fill_sha1_info(struct diff_filespec *one)
2113{
2114 if (DIFF_FILE_VALID(one)) {
2115 if (!one->sha1_valid) {
2116 struct stat st;
5332b2af
JS
2117 if (!strcmp(one->path, "-")) {
2118 hashcpy(one->sha1, null_sha1);
2119 return;
2120 }
6973dcae
JH
2121 if (lstat(one->path, &st) < 0)
2122 die("stat %s", one->path);
2123 if (index_path(one->sha1, one->path, &st, 0))
2124 die("cannot hash %s\n", one->path);
2125 }
2126 }
2127 else
e702496e 2128 hashclr(one->sha1);
6973dcae
JH
2129}
2130
125b7630
RS
2131static int similarity_index(struct diff_filepair *p)
2132{
2133 return p->score * 100 / MAX_SCORE;
2134}
2135
cd676a51
JH
2136static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2137{
2138 /* Strip the prefix but do not molest /dev/null and absolute paths */
2139 if (*namep && **namep != '/')
2140 *namep += prefix_length;
2141 if (*otherp && **otherp != '/')
2142 *otherp += prefix_length;
2143}
2144
6973dcae
JH
2145static void run_diff(struct diff_filepair *p, struct diff_options *o)
2146{
2147 const char *pgm = external_diff();
663af342
PH
2148 struct strbuf msg;
2149 char *xfrm_msg;
2150 struct diff_filespec *one = p->one;
2151 struct diff_filespec *two = p->two;
6973dcae
JH
2152 const char *name;
2153 const char *other;
cd676a51 2154 const char *attr_path;
6973dcae 2155 int complete_rewrite = 0;
663af342 2156
cd676a51
JH
2157 name = p->one->path;
2158 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2159 attr_path = name;
2160 if (o->prefix_length)
2161 strip_prefix(o->prefix_length, &name, &other);
6973dcae
JH
2162
2163 if (DIFF_PAIR_UNMERGED(p)) {
cd676a51
JH
2164 run_diff_cmd(pgm, name, NULL, attr_path,
2165 NULL, NULL, NULL, o, 0);
6973dcae
JH
2166 return;
2167 }
2168
6973dcae
JH
2169 diff_fill_sha1_info(one);
2170 diff_fill_sha1_info(two);
2171
663af342 2172 strbuf_init(&msg, PATH_MAX * 2 + 300);
6973dcae
JH
2173 switch (p->status) {
2174 case DIFF_STATUS_COPIED:
663af342
PH
2175 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2176 strbuf_addstr(&msg, "\ncopy from ");
2177 quote_c_style(name, &msg, NULL, 0);
2178 strbuf_addstr(&msg, "\ncopy to ");
2179 quote_c_style(other, &msg, NULL, 0);
2180 strbuf_addch(&msg, '\n');
6973dcae
JH
2181 break;
2182 case DIFF_STATUS_RENAMED:
663af342
PH
2183 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2184 strbuf_addstr(&msg, "\nrename from ");
2185 quote_c_style(name, &msg, NULL, 0);
2186 strbuf_addstr(&msg, "\nrename to ");
2187 quote_c_style(other, &msg, NULL, 0);
2188 strbuf_addch(&msg, '\n');
6973dcae
JH
2189 break;
2190 case DIFF_STATUS_MODIFIED:
2191 if (p->score) {
663af342 2192 strbuf_addf(&msg, "dissimilarity index %d%%\n",
125b7630 2193 similarity_index(p));
6973dcae
JH
2194 complete_rewrite = 1;
2195 break;
2196 }
2197 /* fallthru */
2198 default:
2199 /* nothing */
2200 ;
2201 }
2202
a89fccd2 2203 if (hashcmp(one->sha1, two->sha1)) {
8f67f8ae 2204 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
6973dcae 2205
8f67f8ae 2206 if (DIFF_OPT_TST(o, BINARY)) {
82793c55 2207 mmfile_t mf;
29a3eefd
JH
2208 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2209 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
82793c55
JH
2210 abbrev = 40;
2211 }
663af342 2212 strbuf_addf(&msg, "index %.*s..%.*s",
dcb3450f
LT
2213 abbrev, sha1_to_hex(one->sha1),
2214 abbrev, sha1_to_hex(two->sha1));
6973dcae 2215 if (one->mode == two->mode)
663af342
PH
2216 strbuf_addf(&msg, " %06o", one->mode);
2217 strbuf_addch(&msg, '\n');
6973dcae
JH
2218 }
2219
663af342
PH
2220 if (msg.len)
2221 strbuf_setlen(&msg, msg.len - 1);
2222 xfrm_msg = msg.len ? msg.buf : NULL;
6973dcae
JH
2223
2224 if (!pgm &&
2225 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2226 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2227 /* a filepair that changes between file and symlink
2228 * needs to be split into deletion and creation.
2229 */
2230 struct diff_filespec *null = alloc_filespec(two->path);
cd676a51
JH
2231 run_diff_cmd(NULL, name, other, attr_path,
2232 one, null, xfrm_msg, o, 0);
6973dcae
JH
2233 free(null);
2234 null = alloc_filespec(one->path);
cd676a51
JH
2235 run_diff_cmd(NULL, name, other, attr_path,
2236 null, two, xfrm_msg, o, 0);
6973dcae
JH
2237 free(null);
2238 }
2239 else
cd676a51
JH
2240 run_diff_cmd(pgm, name, other, attr_path,
2241 one, two, xfrm_msg, o, complete_rewrite);
6973dcae 2242
663af342 2243 strbuf_release(&msg);
6973dcae
JH
2244}
2245
2246static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2247 struct diffstat_t *diffstat)
2248{
2249 const char *name;
2250 const char *other;
710158e3 2251 int complete_rewrite = 0;
6973dcae
JH
2252
2253 if (DIFF_PAIR_UNMERGED(p)) {
2254 /* unmerged */
0d21efa5 2255 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
6973dcae
JH
2256 return;
2257 }
2258
2259 name = p->one->path;
2260 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2261
cd676a51
JH
2262 if (o->prefix_length)
2263 strip_prefix(o->prefix_length, &name, &other);
2264
6973dcae
JH
2265 diff_fill_sha1_info(p->one);
2266 diff_fill_sha1_info(p->two);
2267
710158e3
JH
2268 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2269 complete_rewrite = 1;
0d21efa5 2270 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
6973dcae
JH
2271}
2272
88246898
JS
2273static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2274{
2275 const char *name;
2276 const char *other;
cd676a51 2277 const char *attr_path;
88246898
JS
2278
2279 if (DIFF_PAIR_UNMERGED(p)) {
2280 /* unmerged */
2281 return;
2282 }
2283
2284 name = p->one->path;
2285 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
cd676a51
JH
2286 attr_path = other ? other : name;
2287
2288 if (o->prefix_length)
2289 strip_prefix(o->prefix_length, &name, &other);
88246898
JS
2290
2291 diff_fill_sha1_info(p->one);
2292 diff_fill_sha1_info(p->two);
2293
cd676a51 2294 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
88246898
JS
2295}
2296
6973dcae
JH
2297void diff_setup(struct diff_options *options)
2298{
2299 memset(options, 0, sizeof(*options));
c0c77734
DB
2300
2301 options->file = stdout;
2302
6973dcae
JH
2303 options->line_termination = '\n';
2304 options->break_opt = -1;
2305 options->rename_limit = -1;
7df7c019 2306 options->dirstat_percent = 3;
f88d225f 2307 DIFF_OPT_CLR(options, DIRSTAT_CUMULATIVE);
ee1e5412 2308 options->context = 3;
6973dcae
JH
2309
2310 options->change = diff_change;
2311 options->add_remove = diff_addremove;
6b2f2d98 2312 if (diff_use_color_default > 0)
8f67f8ae
PH
2313 DIFF_OPT_SET(options, COLOR_DIFF);
2314 else
2315 DIFF_OPT_CLR(options, COLOR_DIFF);
b68ea12e 2316 options->detect_rename = diff_detect_rename_default;
eab9a40b
JS
2317
2318 options->a_prefix = "a/";
2319 options->b_prefix = "b/";
6973dcae
JH
2320}
2321
2322int diff_setup_done(struct diff_options *options)
2323{
d7de00f7
TH
2324 int count = 0;
2325
2326 if (options->output_format & DIFF_FORMAT_NAME)
2327 count++;
2328 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2329 count++;
2330 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2331 count++;
2332 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2333 count++;
2334 if (count > 1)
2335 die("--name-only, --name-status, --check and -s are mutually exclusive");
2336
8f67f8ae 2337 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
03b9d560
JH
2338 options->detect_rename = DIFF_DETECT_COPY;
2339
cd676a51
JH
2340 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2341 options->prefix = NULL;
2342 if (options->prefix)
2343 options->prefix_length = strlen(options->prefix);
2344 else
2345 options->prefix_length = 0;
2346
c6744349
TH
2347 if (options->output_format & (DIFF_FORMAT_NAME |
2348 DIFF_FORMAT_NAME_STATUS |
2349 DIFF_FORMAT_CHECKDIFF |
2350 DIFF_FORMAT_NO_OUTPUT))
2351 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 2352 DIFF_FORMAT_NUMSTAT |
c6744349 2353 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2354 DIFF_FORMAT_SHORTSTAT |
7df7c019 2355 DIFF_FORMAT_DIRSTAT |
c6744349
TH
2356 DIFF_FORMAT_SUMMARY |
2357 DIFF_FORMAT_PATCH);
2358
6973dcae
JH
2359 /*
2360 * These cases always need recursive; we do not drop caller-supplied
2361 * recursive bits for other formats here.
2362 */
c6744349 2363 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 2364 DIFF_FORMAT_NUMSTAT |
c6744349 2365 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2366 DIFF_FORMAT_SHORTSTAT |
7df7c019 2367 DIFF_FORMAT_DIRSTAT |
d7014dc0 2368 DIFF_FORMAT_SUMMARY |
c6744349 2369 DIFF_FORMAT_CHECKDIFF))
8f67f8ae 2370 DIFF_OPT_SET(options, RECURSIVE);
5e363541 2371 /*
3969cf7d 2372 * Also pickaxe would not work very well if you do not say recursive
5e363541 2373 */
3969cf7d 2374 if (options->pickaxe)
8f67f8ae 2375 DIFF_OPT_SET(options, RECURSIVE);
5e363541 2376
6973dcae
JH
2377 if (options->detect_rename && options->rename_limit < 0)
2378 options->rename_limit = diff_rename_limit_default;
2379 if (options->setup & DIFF_SETUP_USE_CACHE) {
2380 if (!active_cache)
2381 /* read-cache does not die even when it fails
2382 * so it is safe for us to do this here. Also
2383 * it does not smudge active_cache or active_nr
2384 * when it fails, so we do not have to worry about
2385 * cleaning it up ourselves either.
2386 */
2387 read_cache();
2388 }
6973dcae
JH
2389 if (options->abbrev <= 0 || 40 < options->abbrev)
2390 options->abbrev = 40; /* full */
2391
68aacb2f
JH
2392 /*
2393 * It does not make sense to show the first hit we happened
2394 * to have found. It does not make sense not to return with
2395 * exit code in such a case either.
2396 */
8f67f8ae 2397 if (DIFF_OPT_TST(options, QUIET)) {
68aacb2f 2398 options->output_format = DIFF_FORMAT_NO_OUTPUT;
8f67f8ae 2399 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f
JH
2400 }
2401
2402 /*
2403 * If we postprocess in diffcore, we cannot simply return
2404 * upon the first hit. We need to run diff as usual.
2405 */
2406 if (options->pickaxe || options->filter)
8f67f8ae 2407 DIFF_OPT_CLR(options, QUIET);
68aacb2f 2408
6973dcae
JH
2409 return 0;
2410}
2411
d2543b8e 2412static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
ee1e5412
LT
2413{
2414 char c, *eq;
2415 int len;
2416
2417 if (*arg != '-')
2418 return 0;
2419 c = *++arg;
2420 if (!c)
2421 return 0;
2422 if (c == arg_short) {
2423 c = *++arg;
2424 if (!c)
2425 return 1;
2426 if (val && isdigit(c)) {
2427 char *end;
2428 int n = strtoul(arg, &end, 10);
2429 if (*end)
2430 return 0;
2431 *val = n;
2432 return 1;
2433 }
2434 return 0;
2435 }
2436 if (c != '-')
2437 return 0;
2438 arg++;
2439 eq = strchr(arg, '=');
2440 if (eq)
2441 len = eq - arg;
2442 else
2443 len = strlen(arg);
2444 if (!len || strncmp(arg, arg_long, len))
2445 return 0;
2446 if (eq) {
2447 int n;
2448 char *end;
2449 if (!isdigit(*++eq))
2450 return 0;
2451 n = strtoul(eq, &end, 10);
2452 if (*end)
2453 return 0;
2454 *val = n;
2455 }
2456 return 1;
2457}
2458
16befb8b
JH
2459static int diff_scoreopt_parse(const char *opt);
2460
6973dcae
JH
2461int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2462{
2463 const char *arg = av[0];
d054680c
PH
2464
2465 /* Output format options */
6973dcae 2466 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
c6744349 2467 options->output_format |= DIFF_FORMAT_PATCH;
ee1e5412 2468 else if (opt_arg(arg, 'U', "unified", &options->context))
c6744349 2469 options->output_format |= DIFF_FORMAT_PATCH;
a610786f
TH
2470 else if (!strcmp(arg, "--raw"))
2471 options->output_format |= DIFF_FORMAT_RAW;
8f67f8ae 2472 else if (!strcmp(arg, "--patch-with-raw"))
c6744349 2473 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
8f67f8ae 2474 else if (!strcmp(arg, "--numstat"))
74e2abe5 2475 options->output_format |= DIFF_FORMAT_NUMSTAT;
8f67f8ae 2476 else if (!strcmp(arg, "--shortstat"))
ebd124c6 2477 options->output_format |= DIFF_FORMAT_SHORTSTAT;
7df7c019
LT
2478 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2479 options->output_format |= DIFF_FORMAT_DIRSTAT;
f88d225f
JH
2480 else if (!strcmp(arg, "--cumulative")) {
2481 options->output_format |= DIFF_FORMAT_DIRSTAT;
2482 DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
fd33777b
HO
2483 } else if (opt_arg(arg, 0, "dirstat-by-file",
2484 &options->dirstat_percent)) {
2485 options->output_format |= DIFF_FORMAT_DIRSTAT;
2486 DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
f88d225f 2487 }
d054680c
PH
2488 else if (!strcmp(arg, "--check"))
2489 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2490 else if (!strcmp(arg, "--summary"))
2491 options->output_format |= DIFF_FORMAT_SUMMARY;
2492 else if (!strcmp(arg, "--patch-with-stat"))
2493 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2494 else if (!strcmp(arg, "--name-only"))
2495 options->output_format |= DIFF_FORMAT_NAME;
2496 else if (!strcmp(arg, "--name-status"))
2497 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2498 else if (!strcmp(arg, "-s"))
2499 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
cc44c765 2500 else if (!prefixcmp(arg, "--stat")) {
5c5b2ea9
LT
2501 char *end;
2502 int width = options->stat_width;
2503 int name_width = options->stat_name_width;
2504 arg += 6;
2505 end = (char *)arg;
2506
2507 switch (*arg) {
2508 case '-':
cc44c765 2509 if (!prefixcmp(arg, "-width="))
5c5b2ea9 2510 width = strtoul(arg + 7, &end, 10);
cc44c765 2511 else if (!prefixcmp(arg, "-name-width="))
5c5b2ea9
LT
2512 name_width = strtoul(arg + 12, &end, 10);
2513 break;
2514 case '=':
2515 width = strtoul(arg+1, &end, 10);
2516 if (*end == ',')
2517 name_width = strtoul(end+1, &end, 10);
2518 }
2519
2520 /* Important! This checks all the error cases! */
2521 if (*end)
2522 return 0;
c6744349 2523 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5c5b2ea9
LT
2524 options->stat_name_width = name_width;
2525 options->stat_width = width;
a2540023 2526 }
d054680c
PH
2527
2528 /* renames options */
cc44c765 2529 else if (!prefixcmp(arg, "-B")) {
8f67f8ae 2530 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2531 return -1;
2532 }
cc44c765 2533 else if (!prefixcmp(arg, "-M")) {
8f67f8ae 2534 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2535 return -1;
2536 options->detect_rename = DIFF_DETECT_RENAME;
2537 }
cc44c765 2538 else if (!prefixcmp(arg, "-C")) {
ca6c0970 2539 if (options->detect_rename == DIFF_DETECT_COPY)
8f67f8ae
PH
2540 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2541 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2542 return -1;
2543 options->detect_rename = DIFF_DETECT_COPY;
2544 }
d054680c
PH
2545 else if (!strcmp(arg, "--no-renames"))
2546 options->detect_rename = 0;
cd676a51
JH
2547 else if (!strcmp(arg, "--relative"))
2548 DIFF_OPT_SET(options, RELATIVE_NAME);
c0cb4a06
JH
2549 else if (!prefixcmp(arg, "--relative=")) {
2550 DIFF_OPT_SET(options, RELATIVE_NAME);
2551 options->prefix = arg + 11;
2552 }
d054680c
PH
2553
2554 /* xdiff options */
2555 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2556 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2557 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2558 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2559 else if (!strcmp(arg, "--ignore-space-at-eol"))
2560 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2561
2562 /* flags options */
2563 else if (!strcmp(arg, "--binary")) {
2564 options->output_format |= DIFF_FORMAT_PATCH;
2565 DIFF_OPT_SET(options, BINARY);
2566 }
2567 else if (!strcmp(arg, "--full-index"))
2568 DIFF_OPT_SET(options, FULL_INDEX);
2569 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2570 DIFF_OPT_SET(options, TEXT);
2571 else if (!strcmp(arg, "-R"))
2572 DIFF_OPT_SET(options, REVERSE_DIFF);
6973dcae 2573 else if (!strcmp(arg, "--find-copies-harder"))
8f67f8ae 2574 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
750f7b66 2575 else if (!strcmp(arg, "--follow"))
8f67f8ae 2576 DIFF_OPT_SET(options, FOLLOW_RENAMES);
cd112cef 2577 else if (!strcmp(arg, "--color"))
8f67f8ae 2578 DIFF_OPT_SET(options, COLOR_DIFF);
fef88bb0 2579 else if (!strcmp(arg, "--no-color"))
8f67f8ae 2580 DIFF_OPT_CLR(options, COLOR_DIFF);
f59a59e2 2581 else if (!strcmp(arg, "--color-words"))
8f67f8ae 2582 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
41bbf9d5 2583 else if (!strcmp(arg, "--exit-code"))
8f67f8ae 2584 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f 2585 else if (!strcmp(arg, "--quiet"))
8f67f8ae 2586 DIFF_OPT_SET(options, QUIET);
72909bef 2587 else if (!strcmp(arg, "--ext-diff"))
8f67f8ae 2588 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
72909bef 2589 else if (!strcmp(arg, "--no-ext-diff"))
8f67f8ae 2590 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
50fd9bd8
JS
2591 else if (!strcmp(arg, "--ignore-submodules"))
2592 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
d054680c
PH
2593
2594 /* misc options */
2595 else if (!strcmp(arg, "-z"))
2596 options->line_termination = 0;
2597 else if (!prefixcmp(arg, "-l"))
2598 options->rename_limit = strtoul(arg+2, NULL, 10);
2599 else if (!prefixcmp(arg, "-S"))
2600 options->pickaxe = arg + 2;
2601 else if (!strcmp(arg, "--pickaxe-all"))
2602 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2603 else if (!strcmp(arg, "--pickaxe-regex"))
2604 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2605 else if (!prefixcmp(arg, "-O"))
2606 options->orderfile = arg + 2;
2607 else if (!prefixcmp(arg, "--diff-filter="))
2608 options->filter = arg + 14;
2609 else if (!strcmp(arg, "--abbrev"))
2610 options->abbrev = DEFAULT_ABBREV;
2611 else if (!prefixcmp(arg, "--abbrev=")) {
2612 options->abbrev = strtoul(arg + 9, NULL, 10);
2613 if (options->abbrev < MINIMUM_ABBREV)
2614 options->abbrev = MINIMUM_ABBREV;
2615 else if (40 < options->abbrev)
2616 options->abbrev = 40;
2617 }
eab9a40b
JS
2618 else if (!prefixcmp(arg, "--src-prefix="))
2619 options->a_prefix = arg + 13;
2620 else if (!prefixcmp(arg, "--dst-prefix="))
2621 options->b_prefix = arg + 13;
2622 else if (!strcmp(arg, "--no-prefix"))
2623 options->a_prefix = options->b_prefix = "";
c0c77734
DB
2624 else if (!prefixcmp(arg, "--output=")) {
2625 options->file = fopen(arg + strlen("--output="), "w");
2626 options->close_file = 1;
2627 } else
6973dcae
JH
2628 return 0;
2629 return 1;
2630}
2631
2632static int parse_num(const char **cp_p)
2633{
2634 unsigned long num, scale;
2635 int ch, dot;
2636 const char *cp = *cp_p;
2637
2638 num = 0;
2639 scale = 1;
2640 dot = 0;
2641 for(;;) {
2642 ch = *cp;
2643 if ( !dot && ch == '.' ) {
2644 scale = 1;
2645 dot = 1;
2646 } else if ( ch == '%' ) {
2647 scale = dot ? scale*100 : 100;
2648 cp++; /* % is always at the end */
2649 break;
2650 } else if ( ch >= '0' && ch <= '9' ) {
2651 if ( scale < 100000 ) {
2652 scale *= 10;
2653 num = (num*10) + (ch-'0');
2654 }
2655 } else {
2656 break;
2657 }
2658 cp++;
2659 }
2660 *cp_p = cp;
2661
2662 /* user says num divided by scale and we say internally that
2663 * is MAX_SCORE * num / scale.
2664 */
dc49cd76 2665 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
6973dcae
JH
2666}
2667
16befb8b 2668static int diff_scoreopt_parse(const char *opt)
6973dcae
JH
2669{
2670 int opt1, opt2, cmd;
2671
2672 if (*opt++ != '-')
2673 return -1;
2674 cmd = *opt++;
2675 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2676 return -1; /* that is not a -M, -C nor -B option */
2677
2678 opt1 = parse_num(&opt);
2679 if (cmd != 'B')
2680 opt2 = 0;
2681 else {
2682 if (*opt == 0)
2683 opt2 = 0;
2684 else if (*opt != '/')
2685 return -1; /* we expect -B80/99 or -B80 */
2686 else {
2687 opt++;
2688 opt2 = parse_num(&opt);
2689 }
2690 }
2691 if (*opt != 0)
2692 return -1;
2693 return opt1 | (opt2 << 16);
2694}
2695
2696struct diff_queue_struct diff_queued_diff;
2697
2698void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2699{
2700 if (queue->alloc <= queue->nr) {
2701 queue->alloc = alloc_nr(queue->alloc);
2702 queue->queue = xrealloc(queue->queue,
2703 sizeof(dp) * queue->alloc);
2704 }
2705 queue->queue[queue->nr++] = dp;
2706}
2707
2708struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2709 struct diff_filespec *one,
2710 struct diff_filespec *two)
2711{
ef677686 2712 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
6973dcae
JH
2713 dp->one = one;
2714 dp->two = two;
6973dcae
JH
2715 if (queue)
2716 diff_q(queue, dp);
2717 return dp;
2718}
2719
2720void diff_free_filepair(struct diff_filepair *p)
2721{
9fb88419
LT
2722 free_filespec(p->one);
2723 free_filespec(p->two);
6973dcae
JH
2724 free(p);
2725}
2726
2727/* This is different from find_unique_abbrev() in that
2728 * it stuffs the result with dots for alignment.
2729 */
2730const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2731{
2732 int abblen;
2733 const char *abbrev;
2734 if (len == 40)
2735 return sha1_to_hex(sha1);
2736
2737 abbrev = find_unique_abbrev(sha1, len);
6973dcae
JH
2738 abblen = strlen(abbrev);
2739 if (abblen < 37) {
2740 static char hex[41];
2741 if (len < abblen && abblen <= len + 2)
2742 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2743 else
2744 sprintf(hex, "%s...", abbrev);
2745 return hex;
2746 }
2747 return sha1_to_hex(sha1);
2748}
2749
663af342 2750static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
6973dcae 2751{
663af342
PH
2752 int line_termination = opt->line_termination;
2753 int inter_name_termination = line_termination ? '\t' : '\0';
6973dcae 2754
663af342 2755 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
c0c77734
DB
2756 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2757 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2758 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
6973dcae 2759 }
663af342 2760 if (p->score) {
c0c77734
DB
2761 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2762 inter_name_termination);
663af342 2763 } else {
c0c77734 2764 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
6973dcae 2765 }
6973dcae 2766
cd676a51
JH
2767 if (p->status == DIFF_STATUS_COPIED ||
2768 p->status == DIFF_STATUS_RENAMED) {
2769 const char *name_a, *name_b;
2770 name_a = p->one->path;
2771 name_b = p->two->path;
2772 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734
DB
2773 write_name_quoted(name_a, opt->file, inter_name_termination);
2774 write_name_quoted(name_b, opt->file, line_termination);
663af342 2775 } else {
cd676a51
JH
2776 const char *name_a, *name_b;
2777 name_a = p->one->mode ? p->one->path : p->two->path;
2778 name_b = NULL;
2779 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734 2780 write_name_quoted(name_a, opt->file, line_termination);
663af342 2781 }
6973dcae
JH
2782}
2783
2784int diff_unmodified_pair(struct diff_filepair *p)
2785{
2786 /* This function is written stricter than necessary to support
2787 * the currently implemented transformers, but the idea is to
2788 * let transformers to produce diff_filepairs any way they want,
2789 * and filter and clean them up here before producing the output.
2790 */
663af342 2791 struct diff_filespec *one = p->one, *two = p->two;
6973dcae
JH
2792
2793 if (DIFF_PAIR_UNMERGED(p))
2794 return 0; /* unmerged is interesting */
2795
6973dcae
JH
2796 /* deletion, addition, mode or type change
2797 * and rename are all interesting.
2798 */
2799 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2800 DIFF_PAIR_MODE_CHANGED(p) ||
2801 strcmp(one->path, two->path))
2802 return 0;
2803
2804 /* both are valid and point at the same path. that is, we are
2805 * dealing with a change.
2806 */
2807 if (one->sha1_valid && two->sha1_valid &&
a89fccd2 2808 !hashcmp(one->sha1, two->sha1))
6973dcae
JH
2809 return 1; /* no change */
2810 if (!one->sha1_valid && !two->sha1_valid)
2811 return 1; /* both look at the same file on the filesystem. */
2812 return 0;
2813}
2814
2815static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2816{
2817 if (diff_unmodified_pair(p))
2818 return;
2819
2820 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2821 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2822 return; /* no tree diffs in patch format */
2823
2824 run_diff(p, o);
2825}
2826
2827static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2828 struct diffstat_t *diffstat)
2829{
2830 if (diff_unmodified_pair(p))
2831 return;
2832
2833 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2834 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2835 return; /* no tree diffs in patch format */
2836
2837 run_diffstat(p, o, diffstat);
2838}
2839
88246898
JS
2840static void diff_flush_checkdiff(struct diff_filepair *p,
2841 struct diff_options *o)
2842{
2843 if (diff_unmodified_pair(p))
2844 return;
2845
2846 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2847 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2848 return; /* no tree diffs in patch format */
2849
2850 run_checkdiff(p, o);
2851}
2852
6973dcae
JH
2853int diff_queue_is_empty(void)
2854{
2855 struct diff_queue_struct *q = &diff_queued_diff;
2856 int i;
2857 for (i = 0; i < q->nr; i++)
2858 if (!diff_unmodified_pair(q->queue[i]))
2859 return 0;
2860 return 1;
2861}
2862
2863#if DIFF_DEBUG
2864void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2865{
2866 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2867 x, one ? one : "",
2868 s->path,
2869 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2870 s->mode,
2871 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2872 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2873 x, one ? one : "",
2874 s->size, s->xfrm_flags);
2875}
2876
2877void diff_debug_filepair(const struct diff_filepair *p, int i)
2878{
2879 diff_debug_filespec(p->one, i, "one");
2880 diff_debug_filespec(p->two, i, "two");
64479711 2881 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
6973dcae 2882 p->score, p->status ? p->status : '?',
64479711 2883 p->one->rename_used, p->broken_pair);
6973dcae
JH
2884}
2885
2886void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2887{
2888 int i;
2889 if (msg)
2890 fprintf(stderr, "%s\n", msg);
2891 fprintf(stderr, "q->nr = %d\n", q->nr);
2892 for (i = 0; i < q->nr; i++) {
2893 struct diff_filepair *p = q->queue[i];
2894 diff_debug_filepair(p, i);
2895 }
2896}
2897#endif
2898
2899static void diff_resolve_rename_copy(void)
2900{
64479711
LT
2901 int i;
2902 struct diff_filepair *p;
6973dcae
JH
2903 struct diff_queue_struct *q = &diff_queued_diff;
2904
2905 diff_debug_queue("resolve-rename-copy", q);
2906
2907 for (i = 0; i < q->nr; i++) {
2908 p = q->queue[i];
2909 p->status = 0; /* undecided */
2910 if (DIFF_PAIR_UNMERGED(p))
2911 p->status = DIFF_STATUS_UNMERGED;
2912 else if (!DIFF_FILE_VALID(p->one))
2913 p->status = DIFF_STATUS_ADDED;
2914 else if (!DIFF_FILE_VALID(p->two))
2915 p->status = DIFF_STATUS_DELETED;
2916 else if (DIFF_PAIR_TYPE_CHANGED(p))
2917 p->status = DIFF_STATUS_TYPE_CHANGED;
2918
2919 /* from this point on, we are dealing with a pair
2920 * whose both sides are valid and of the same type, i.e.
2921 * either in-place edit or rename/copy edit.
2922 */
2923 else if (DIFF_PAIR_RENAME(p)) {
64479711
LT
2924 /*
2925 * A rename might have re-connected a broken
2926 * pair up, causing the pathnames to be the
2927 * same again. If so, that's not a rename at
2928 * all, just a modification..
2929 *
2930 * Otherwise, see if this source was used for
2931 * multiple renames, in which case we decrement
2932 * the count, and call it a copy.
6973dcae 2933 */
64479711
LT
2934 if (!strcmp(p->one->path, p->two->path))
2935 p->status = DIFF_STATUS_MODIFIED;
2936 else if (--p->one->rename_used > 0)
6973dcae 2937 p->status = DIFF_STATUS_COPIED;
64479711 2938 else
6973dcae
JH
2939 p->status = DIFF_STATUS_RENAMED;
2940 }
a89fccd2 2941 else if (hashcmp(p->one->sha1, p->two->sha1) ||
d516c2d1
JS
2942 p->one->mode != p->two->mode ||
2943 is_null_sha1(p->one->sha1))
6973dcae
JH
2944 p->status = DIFF_STATUS_MODIFIED;
2945 else {
2946 /* This is a "no-change" entry and should not
2947 * happen anymore, but prepare for broken callers.
2948 */
2949 error("feeding unmodified %s to diffcore",
2950 p->one->path);
2951 p->status = DIFF_STATUS_UNKNOWN;
2952 }
2953 }
2954 diff_debug_queue("resolve-rename-copy done", q);
2955}
2956
c6744349 2957static int check_pair_status(struct diff_filepair *p)
6973dcae 2958{
6973dcae
JH
2959 switch (p->status) {
2960 case DIFF_STATUS_UNKNOWN:
c6744349 2961 return 0;
6973dcae
JH
2962 case 0:
2963 die("internal error in diff-resolve-rename-copy");
6973dcae 2964 default:
c6744349 2965 return 1;
6973dcae
JH
2966 }
2967}
2968
c6744349
TH
2969static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2970{
2971 int fmt = opt->output_format;
2972
2973 if (fmt & DIFF_FORMAT_CHECKDIFF)
2974 diff_flush_checkdiff(p, opt);
2975 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2976 diff_flush_raw(p, opt);
cd676a51
JH
2977 else if (fmt & DIFF_FORMAT_NAME) {
2978 const char *name_a, *name_b;
2979 name_a = p->two->path;
2980 name_b = NULL;
2981 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734 2982 write_name_quoted(name_a, opt->file, opt->line_termination);
cd676a51 2983 }
c6744349
TH
2984}
2985
c0c77734 2986static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4bbd261b
SE
2987{
2988 if (fs->mode)
c0c77734 2989 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4bbd261b 2990 else
c0c77734
DB
2991 fprintf(file, " %s ", newdelete);
2992 write_name_quoted(fs->path, file, '\n');
4bbd261b
SE
2993}
2994
2995
c0c77734 2996static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
4bbd261b
SE
2997{
2998 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
c0c77734 2999 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
663af342 3000 show_name ? ' ' : '\n');
0d26a64e 3001 if (show_name) {
c0c77734 3002 write_name_quoted(p->two->path, file, '\n');
0d26a64e 3003 }
4bbd261b
SE
3004 }
3005}
3006
c0c77734 3007static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
4bbd261b 3008{
b9f44164 3009 char *names = pprint_rename(p->one->path, p->two->path);
4bbd261b 3010
c0c77734 3011 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
b9f44164 3012 free(names);
c0c77734 3013 show_mode_change(file, p, 0);
4bbd261b
SE
3014}
3015
c0c77734 3016static void diff_summary(FILE *file, struct diff_filepair *p)
4bbd261b
SE
3017{
3018 switch(p->status) {
3019 case DIFF_STATUS_DELETED:
c0c77734 3020 show_file_mode_name(file, "delete", p->one);
4bbd261b
SE
3021 break;
3022 case DIFF_STATUS_ADDED:
c0c77734 3023 show_file_mode_name(file, "create", p->two);
4bbd261b
SE
3024 break;
3025 case DIFF_STATUS_COPIED:
c0c77734 3026 show_rename_copy(file, "copy", p);
4bbd261b
SE
3027 break;
3028 case DIFF_STATUS_RENAMED:
c0c77734 3029 show_rename_copy(file, "rename", p);
4bbd261b
SE
3030 break;
3031 default:
3032 if (p->score) {
c0c77734
DB
3033 fputs(" rewrite ", file);
3034 write_name_quoted(p->two->path, file, ' ');
3035 fprintf(file, "(%d%%)\n", similarity_index(p));
663af342 3036 }
c0c77734 3037 show_mode_change(file, p, !p->score);
4bbd261b
SE
3038 break;
3039 }
3040}
3041
fcb3d0ad 3042struct patch_id_t {
fcb3d0ad
JS
3043 SHA_CTX *ctx;
3044 int patchlen;
3045};
3046
3047static int remove_space(char *line, int len)
3048{
3049 int i;
663af342
PH
3050 char *dst = line;
3051 unsigned char c;
fcb3d0ad 3052
663af342
PH
3053 for (i = 0; i < len; i++)
3054 if (!isspace((c = line[i])))
3055 *dst++ = c;
fcb3d0ad 3056
663af342 3057 return dst - line;
fcb3d0ad
JS
3058}
3059
3060static void patch_id_consume(void *priv, char *line, unsigned long len)
3061{
3062 struct patch_id_t *data = priv;
3063 int new_len;
3064
3065 /* Ignore line numbers when computing the SHA1 of the patch */
cc44c765 3066 if (!prefixcmp(line, "@@ -"))
fcb3d0ad
JS
3067 return;
3068
3069 new_len = remove_space(line, len);
3070
3071 SHA1_Update(data->ctx, line, new_len);
3072 data->patchlen += new_len;
3073}
3074
3075/* returns 0 upon success, and writes result into sha1 */
3076static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3077{
3078 struct diff_queue_struct *q = &diff_queued_diff;
3079 int i;
3080 SHA_CTX ctx;
3081 struct patch_id_t data;
3082 char buffer[PATH_MAX * 4 + 20];
3083
3084 SHA1_Init(&ctx);
3085 memset(&data, 0, sizeof(struct patch_id_t));
3086 data.ctx = &ctx;
fcb3d0ad
JS
3087
3088 for (i = 0; i < q->nr; i++) {
3089 xpparam_t xpp;
3090 xdemitconf_t xecfg;
3091 xdemitcb_t ecb;
3092 mmfile_t mf1, mf2;
3093 struct diff_filepair *p = q->queue[i];
3094 int len1, len2;
3095
30b25010 3096 memset(&xecfg, 0, sizeof(xecfg));
fcb3d0ad
JS
3097 if (p->status == 0)
3098 return error("internal diff status error");
3099 if (p->status == DIFF_STATUS_UNKNOWN)
3100 continue;
3101 if (diff_unmodified_pair(p))
3102 continue;
3103 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3104 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3105 continue;
3106 if (DIFF_PAIR_UNMERGED(p))
3107 continue;
3108
3109 diff_fill_sha1_info(p->one);
3110 diff_fill_sha1_info(p->two);
3111 if (fill_mmfile(&mf1, p->one) < 0 ||
3112 fill_mmfile(&mf2, p->two) < 0)
3113 return error("unable to read files to diff");
3114
fcb3d0ad
JS
3115 len1 = remove_space(p->one->path, strlen(p->one->path));
3116 len2 = remove_space(p->two->path, strlen(p->two->path));
3117 if (p->one->mode == 0)
3118 len1 = snprintf(buffer, sizeof(buffer),
3119 "diff--gita/%.*sb/%.*s"
3120 "newfilemode%06o"
3121 "---/dev/null"
3122 "+++b/%.*s",
3123 len1, p->one->path,
3124 len2, p->two->path,
3125 p->two->mode,
3126 len2, p->two->path);
3127 else if (p->two->mode == 0)
3128 len1 = snprintf(buffer, sizeof(buffer),
3129 "diff--gita/%.*sb/%.*s"
3130 "deletedfilemode%06o"
3131 "---a/%.*s"
3132 "+++/dev/null",
3133 len1, p->one->path,
3134 len2, p->two->path,
3135 p->one->mode,
3136 len1, p->one->path);
3137 else
3138 len1 = snprintf(buffer, sizeof(buffer),
3139 "diff--gita/%.*sb/%.*s"
3140 "---a/%.*s"
3141 "+++b/%.*s",
3142 len1, p->one->path,
3143 len2, p->two->path,
3144 len1, p->one->path,
3145 len2, p->two->path);
3146 SHA1_Update(&ctx, buffer, len1);
3147
3148 xpp.flags = XDF_NEED_MINIMAL;
3149 xecfg.ctxlen = 3;
9fdc3bb5 3150 xecfg.flags = XDL_EMIT_FUNCNAMES;
8a3f524b
JH
3151 xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
3152 &xpp, &xecfg, &ecb);
fcb3d0ad
JS
3153 }
3154
3155 SHA1_Final(sha1, &ctx);
3156 return 0;
3157}
3158
3159int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3160{
3161 struct diff_queue_struct *q = &diff_queued_diff;
3162 int i;
3163 int result = diff_get_patch_id(options, sha1);
3164
3165 for (i = 0; i < q->nr; i++)
3166 diff_free_filepair(q->queue[i]);
3167
3168 free(q->queue);
3169 q->queue = NULL;
3170 q->nr = q->alloc = 0;
3171
3172 return result;
3173}
3174
946c3784 3175static int is_summary_empty(const struct diff_queue_struct *q)
6973dcae 3176{
6973dcae 3177 int i;
6973dcae 3178
946c3784
TH
3179 for (i = 0; i < q->nr; i++) {
3180 const struct diff_filepair *p = q->queue[i];
3181
3182 switch (p->status) {
3183 case DIFF_STATUS_DELETED:
3184 case DIFF_STATUS_ADDED:
3185 case DIFF_STATUS_COPIED:
3186 case DIFF_STATUS_RENAMED:
3187 return 0;
3188 default:
3189 if (p->score)
3190 return 0;
3191 if (p->one->mode && p->two->mode &&
3192 p->one->mode != p->two->mode)
3193 return 0;
3194 break;
3195 }
6973dcae 3196 }
946c3784
TH
3197 return 1;
3198}
3199
6973dcae
JH
3200void diff_flush(struct diff_options *options)
3201{
3202 struct diff_queue_struct *q = &diff_queued_diff;
c6744349 3203 int i, output_format = options->output_format;
946c3784 3204 int separator = 0;
6973dcae 3205
c6744349
TH
3206 /*
3207 * Order: raw, stat, summary, patch
3208 * or: name/name-status/checkdiff (other bits clear)
3209 */
946c3784
TH
3210 if (!q->nr)
3211 goto free_queue;
6973dcae 3212
c6744349
TH
3213 if (output_format & (DIFF_FORMAT_RAW |
3214 DIFF_FORMAT_NAME |
3215 DIFF_FORMAT_NAME_STATUS |
3216 DIFF_FORMAT_CHECKDIFF)) {
6973dcae
JH
3217 for (i = 0; i < q->nr; i++) {
3218 struct diff_filepair *p = q->queue[i];
c6744349
TH
3219 if (check_pair_status(p))
3220 flush_one_pair(p, options);
6973dcae 3221 }
946c3784 3222 separator++;
6973dcae 3223 }
c6744349 3224
c04a7155 3225 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
5e2b0636 3226 struct diffstat_t diffstat;
c6744349 3227
5e2b0636 3228 memset(&diffstat, 0, sizeof(struct diffstat_t));
6973dcae
JH
3229 for (i = 0; i < q->nr; i++) {
3230 struct diff_filepair *p = q->queue[i];
c6744349 3231 if (check_pair_status(p))
5e2b0636 3232 diff_flush_stat(p, options, &diffstat);
6973dcae 3233 }
74e2abe5
JH
3234 if (output_format & DIFF_FORMAT_NUMSTAT)
3235 show_numstat(&diffstat, options);
3236 if (output_format & DIFF_FORMAT_DIFFSTAT)
3237 show_stats(&diffstat, options);
f604652e 3238 if (output_format & DIFF_FORMAT_SHORTSTAT)
c0c77734 3239 show_shortstats(&diffstat, options);
f604652e 3240 free_diffstat_info(&diffstat);
3969cf7d 3241 separator++;
6973dcae 3242 }
c04a7155
JH
3243 if (output_format & DIFF_FORMAT_DIRSTAT)
3244 show_dirstat(options);
6973dcae 3245
946c3784 3246 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
c6744349 3247 for (i = 0; i < q->nr; i++)
c0c77734 3248 diff_summary(options->file, q->queue[i]);
3969cf7d 3249 separator++;
6973dcae
JH
3250 }
3251
c6744349 3252 if (output_format & DIFF_FORMAT_PATCH) {
946c3784 3253 if (separator) {
6b2fbaaf 3254 putc(options->line_termination, options->file);
946c3784
TH
3255 if (options->stat_sep) {
3256 /* attach patch instead of inline */
c0c77734 3257 fputs(options->stat_sep, options->file);
946c3784 3258 }
c6744349
TH
3259 }
3260
3261 for (i = 0; i < q->nr; i++) {
3262 struct diff_filepair *p = q->queue[i];
3263 if (check_pair_status(p))
3264 diff_flush_patch(p, options);
3265 }
4bbd261b
SE
3266 }
3267
04245581
JK
3268 if (output_format & DIFF_FORMAT_CALLBACK)
3269 options->format_callback(q, options, options->format_callback_data);
3270
c6744349
TH
3271 for (i = 0; i < q->nr; i++)
3272 diff_free_filepair(q->queue[i]);
946c3784 3273free_queue:
6973dcae
JH
3274 free(q->queue);
3275 q->queue = NULL;
3276 q->nr = q->alloc = 0;
c0c77734
DB
3277 if (options->close_file)
3278 fclose(options->file);
6973dcae
JH
3279}
3280
3281static void diffcore_apply_filter(const char *filter)
3282{
3283 int i;
3284 struct diff_queue_struct *q = &diff_queued_diff;
3285 struct diff_queue_struct outq;
3286 outq.queue = NULL;
3287 outq.nr = outq.alloc = 0;
3288
3289 if (!filter)
3290 return;
3291
3292 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3293 int found;
3294 for (i = found = 0; !found && i < q->nr; i++) {
3295 struct diff_filepair *p = q->queue[i];
3296 if (((p->status == DIFF_STATUS_MODIFIED) &&
3297 ((p->score &&
3298 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3299 (!p->score &&
3300 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3301 ((p->status != DIFF_STATUS_MODIFIED) &&
3302 strchr(filter, p->status)))
3303 found++;
3304 }
3305 if (found)
3306 return;
3307
3308 /* otherwise we will clear the whole queue
3309 * by copying the empty outq at the end of this
3310 * function, but first clear the current entries
3311 * in the queue.
3312 */
3313 for (i = 0; i < q->nr; i++)
3314 diff_free_filepair(q->queue[i]);
3315 }
3316 else {
3317 /* Only the matching ones */
3318 for (i = 0; i < q->nr; i++) {
3319 struct diff_filepair *p = q->queue[i];
3320
3321 if (((p->status == DIFF_STATUS_MODIFIED) &&
3322 ((p->score &&
3323 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3324 (!p->score &&
3325 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3326 ((p->status != DIFF_STATUS_MODIFIED) &&
3327 strchr(filter, p->status)))
3328 diff_q(&outq, p);
3329 else
3330 diff_free_filepair(p);
3331 }
3332 }
3333 free(q->queue);
3334 *q = outq;
3335}
3336
5701115a
SV
3337/* Check whether two filespecs with the same mode and size are identical */
3338static int diff_filespec_is_identical(struct diff_filespec *one,
3339 struct diff_filespec *two)
3340{
2b459b48
JH
3341 if (S_ISGITLINK(one->mode))
3342 return 0;
5701115a
SV
3343 if (diff_populate_filespec(one, 0))
3344 return 0;
3345 if (diff_populate_filespec(two, 0))
3346 return 0;
3347 return !memcmp(one->data, two->data, one->size);
3348}
3349
fb13227e
JH
3350static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3351{
3352 int i;
3353 struct diff_queue_struct *q = &diff_queued_diff;
3354 struct diff_queue_struct outq;
3355 outq.queue = NULL;
3356 outq.nr = outq.alloc = 0;
3357
3358 for (i = 0; i < q->nr; i++) {
3359 struct diff_filepair *p = q->queue[i];
3360
3361 /*
3362 * 1. Entries that come from stat info dirtyness
3363 * always have both sides (iow, not create/delete),
3364 * one side of the object name is unknown, with
3365 * the same mode and size. Keep the ones that
3366 * do not match these criteria. They have real
3367 * differences.
3368 *
3369 * 2. At this point, the file is known to be modified,
3370 * with the same mode and size, and the object
3371 * name of one side is unknown. Need to inspect
3372 * the identical contents.
3373 */
3374 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3375 !DIFF_FILE_VALID(p->two) ||
3376 (p->one->sha1_valid && p->two->sha1_valid) ||
3377 (p->one->mode != p->two->mode) ||
3378 diff_populate_filespec(p->one, 1) ||
3379 diff_populate_filespec(p->two, 1) ||
3380 (p->one->size != p->two->size) ||
5701115a 3381 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
fb13227e
JH
3382 diff_q(&outq, p);
3383 else {
3384 /*
3385 * The caller can subtract 1 from skip_stat_unmatch
3386 * to determine how many paths were dirty only
3387 * due to stat info mismatch.
3388 */
8f67f8ae 3389 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
6d2d9e86 3390 diffopt->skip_stat_unmatch++;
fb13227e
JH
3391 diff_free_filepair(p);
3392 }
3393 }
3394 free(q->queue);
3395 *q = outq;
3396}
3397
6973dcae
JH
3398void diffcore_std(struct diff_options *options)
3399{
8f67f8ae 3400 if (DIFF_OPT_TST(options, QUIET))
68aacb2f 3401 return;
706098af 3402
8f67f8ae 3403 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
fb13227e 3404 diffcore_skip_stat_unmatch(options);
6973dcae
JH
3405 if (options->break_opt != -1)
3406 diffcore_break(options->break_opt);
3407 if (options->detect_rename)
3408 diffcore_rename(options);
3409 if (options->break_opt != -1)
3410 diffcore_merge_broken();
3411 if (options->pickaxe)
3412 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3413 if (options->orderfile)
3414 diffcore_order(options->orderfile);
3415 diff_resolve_rename_copy();
3416 diffcore_apply_filter(options->filter);
68aacb2f 3417
8f67f8ae
PH
3418 if (diff_queued_diff.nr)
3419 DIFF_OPT_SET(options, HAS_CHANGES);
3420 else
3421 DIFF_OPT_CLR(options, HAS_CHANGES);
6973dcae
JH
3422}
3423
da31b358
JH
3424int diff_result_code(struct diff_options *opt, int status)
3425{
3426 int result = 0;
3427 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3428 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3429 return status;
3430 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3431 DIFF_OPT_TST(opt, HAS_CHANGES))
3432 result |= 01;
3433 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3434 DIFF_OPT_TST(opt, CHECK_FAILED))
3435 result |= 02;
3436 return result;
3437}
6973dcae 3438
6973dcae
JH
3439void diff_addremove(struct diff_options *options,
3440 int addremove, unsigned mode,
3441 const unsigned char *sha1,
fd55a19e 3442 const char *concatpath)
6973dcae 3443{
6973dcae
JH
3444 struct diff_filespec *one, *two;
3445
50fd9bd8
JS
3446 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3447 return;
3448
6973dcae
JH
3449 /* This may look odd, but it is a preparation for
3450 * feeding "there are unchanged files which should
3451 * not produce diffs, but when you are doing copy
3452 * detection you would need them, so here they are"
3453 * entries to the diff-core. They will be prefixed
3454 * with something like '=' or '*' (I haven't decided
3455 * which but should not make any difference).
a6080a0a 3456 * Feeding the same new and old to diff_change()
6973dcae
JH
3457 * also has the same effect.
3458 * Before the final output happens, they are pruned after
3459 * merged into rename/copy pairs as appropriate.
3460 */
8f67f8ae 3461 if (DIFF_OPT_TST(options, REVERSE_DIFF))
6973dcae
JH
3462 addremove = (addremove == '+' ? '-' :
3463 addremove == '-' ? '+' : addremove);
3464
cd676a51
JH
3465 if (options->prefix &&
3466 strncmp(concatpath, options->prefix, options->prefix_length))
3467 return;
3468
6973dcae
JH
3469 one = alloc_filespec(concatpath);
3470 two = alloc_filespec(concatpath);
3471
3472 if (addremove != '+')
3473 fill_filespec(one, sha1, mode);
3474 if (addremove != '-')
3475 fill_filespec(two, sha1, mode);
3476
3477 diff_queue(&diff_queued_diff, one, two);
8f67f8ae 3478 DIFF_OPT_SET(options, HAS_CHANGES);
6973dcae
JH
3479}
3480
3481void diff_change(struct diff_options *options,
3482 unsigned old_mode, unsigned new_mode,
3483 const unsigned char *old_sha1,
3484 const unsigned char *new_sha1,
fd55a19e 3485 const char *concatpath)
6973dcae 3486{
6973dcae
JH
3487 struct diff_filespec *one, *two;
3488
50fd9bd8
JS
3489 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3490 && S_ISGITLINK(new_mode))
3491 return;
3492
8f67f8ae 3493 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
6973dcae
JH
3494 unsigned tmp;
3495 const unsigned char *tmp_c;
3496 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3497 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3498 }
cd676a51
JH
3499
3500 if (options->prefix &&
3501 strncmp(concatpath, options->prefix, options->prefix_length))
3502 return;
3503
6973dcae
JH
3504 one = alloc_filespec(concatpath);
3505 two = alloc_filespec(concatpath);
3506 fill_filespec(one, old_sha1, old_mode);
3507 fill_filespec(two, new_sha1, new_mode);
3508
3509 diff_queue(&diff_queued_diff, one, two);
8f67f8ae 3510 DIFF_OPT_SET(options, HAS_CHANGES);
6973dcae
JH
3511}
3512
3513void diff_unmerge(struct diff_options *options,
e9c84099
JH
3514 const char *path,
3515 unsigned mode, const unsigned char *sha1)
6973dcae
JH
3516{
3517 struct diff_filespec *one, *two;
cd676a51
JH
3518
3519 if (options->prefix &&
3520 strncmp(path, options->prefix, options->prefix_length))
3521 return;
3522
6973dcae
JH
3523 one = alloc_filespec(path);
3524 two = alloc_filespec(path);
e9c84099
JH
3525 fill_filespec(one, sha1, mode);
3526 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
6973dcae 3527}