add boolean diff.suppress-blank-empty config option
[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
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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;
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51 if (!strcasecmp(var+ofs, "commit"))
52 return DIFF_COMMIT;
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53 if (!strcasecmp(var+ofs, "whitespace"))
54 return DIFF_WHITESPACE;
801235c5
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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);
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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);
f1af60bd
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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
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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
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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
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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
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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");
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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
JH
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 {
379 struct xdiff_emit_state xm;
380 struct diff_words_buffer minus, plus;
c0c77734 381 FILE *file;
f59a59e2
JS
382};
383
c0c77734 384static void print_word(FILE *file, struct diff_words_buffer *buffer, int len, int color,
f59a59e2
JS
385 int suppress_newline)
386{
387 const char *ptr;
388 int eol = 0;
389
390 if (len == 0)
391 return;
392
393 ptr = buffer->text.ptr + buffer->current;
394 buffer->current += len;
395
396 if (ptr[len - 1] == '\n') {
397 eol = 1;
398 len--;
399 }
400
c0c77734
DB
401 fputs(diff_get_color(1, color), file);
402 fwrite(ptr, len, 1, file);
403 fputs(diff_get_color(1, DIFF_RESET), file);
f59a59e2
JS
404
405 if (eol) {
406 if (suppress_newline)
407 buffer->suppressed_newline = 1;
408 else
c0c77734 409 putc('\n', file);
f59a59e2
JS
410 }
411}
412
413static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
414{
415 struct diff_words_data *diff_words = priv;
416
417 if (diff_words->minus.suppressed_newline) {
418 if (line[0] != '+')
c0c77734 419 putc('\n', diff_words->file);
f59a59e2
JS
420 diff_words->minus.suppressed_newline = 0;
421 }
422
423 len--;
424 switch (line[0]) {
425 case '-':
c0c77734
DB
426 print_word(diff_words->file,
427 &diff_words->minus, len, DIFF_FILE_OLD, 1);
f59a59e2
JS
428 break;
429 case '+':
c0c77734
DB
430 print_word(diff_words->file,
431 &diff_words->plus, len, DIFF_FILE_NEW, 0);
f59a59e2
JS
432 break;
433 case ' ':
c0c77734
DB
434 print_word(diff_words->file,
435 &diff_words->plus, len, DIFF_PLAIN, 0);
f59a59e2
JS
436 diff_words->minus.current += len;
437 break;
438 }
439}
440
441/* this executes the word diff on the accumulated buffers */
442static void diff_words_show(struct diff_words_data *diff_words)
443{
444 xpparam_t xpp;
445 xdemitconf_t xecfg;
446 xdemitcb_t ecb;
447 mmfile_t minus, plus;
448 int i;
449
30b25010 450 memset(&xecfg, 0, sizeof(xecfg));
f59a59e2
JS
451 minus.size = diff_words->minus.text.size;
452 minus.ptr = xmalloc(minus.size);
453 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
454 for (i = 0; i < minus.size; i++)
455 if (isspace(minus.ptr[i]))
456 minus.ptr[i] = '\n';
457 diff_words->minus.current = 0;
458
459 plus.size = diff_words->plus.text.size;
460 plus.ptr = xmalloc(plus.size);
461 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
462 for (i = 0; i < plus.size; i++)
463 if (isspace(plus.ptr[i]))
464 plus.ptr[i] = '\n';
465 diff_words->plus.current = 0;
466
467 xpp.flags = XDF_NEED_MINIMAL;
468 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
f59a59e2
JS
469 ecb.outf = xdiff_outf;
470 ecb.priv = diff_words;
471 diff_words->xm.consume = fn_out_diff_words_aux;
c279d7e9 472 xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
f59a59e2
JS
473
474 free(minus.ptr);
475 free(plus.ptr);
476 diff_words->minus.text.size = diff_words->plus.text.size = 0;
477
478 if (diff_words->minus.suppressed_newline) {
c0c77734 479 putc('\n', diff_words->file);
f59a59e2
JS
480 diff_words->minus.suppressed_newline = 0;
481 }
482}
483
23707811
JH
484typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
485
6973dcae 486struct emit_callback {
cd112cef
JS
487 struct xdiff_emit_state xm;
488 int nparents, color_diff;
cf1b7869 489 unsigned ws_rule;
23707811 490 sane_truncate_fn truncate;
6973dcae 491 const char **label_path;
f59a59e2 492 struct diff_words_data *diff_words;
34a5e1a2 493 int *found_changesp;
c0c77734 494 FILE *file;
6973dcae
JH
495};
496
f59a59e2
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497static void free_diff_words_data(struct emit_callback *ecbdata)
498{
499 if (ecbdata->diff_words) {
500 /* flush buffers */
501 if (ecbdata->diff_words->minus.text.size ||
502 ecbdata->diff_words->plus.text.size)
503 diff_words_show(ecbdata->diff_words);
504
8e0f7003
JM
505 free (ecbdata->diff_words->minus.text.ptr);
506 free (ecbdata->diff_words->plus.text.ptr);
f59a59e2
JS
507 free(ecbdata->diff_words);
508 ecbdata->diff_words = NULL;
509 }
510}
511
ce436973 512const char *diff_get_color(int diff_use_color, enum color_diff ix)
cd112cef
JS
513{
514 if (diff_use_color)
50f575fc
LT
515 return diff_colors[ix];
516 return "";
cd112cef
JS
517}
518
c0c77734 519static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
448c3ef1 520{
4afbcab9
JH
521 int has_trailing_newline = (len > 0 && line[len-1] == '\n');
522 if (has_trailing_newline)
06ff64ae
SG
523 len--;
524
c0c77734
DB
525 fputs(set, file);
526 fwrite(line, len, 1, file);
527 fputs(reset, file);
4afbcab9
JH
528 if (has_trailing_newline)
529 fputc('\n', file);
448c3ef1
JH
530}
531
c5a8c3ec
JS
532static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
533{
534 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
535 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
536
537 if (!*ws)
c0c77734 538 emit_line(ecbdata->file, set, reset, line, len);
c1795bb0
WC
539 else {
540 /* Emit just the prefix, then the rest. */
c0c77734 541 emit_line(ecbdata->file, set, reset, line, ecbdata->nparents);
8f8841e9
JH
542 ws_check_emit(line + ecbdata->nparents,
543 len - ecbdata->nparents, ecbdata->ws_rule,
544 ecbdata->file, set, reset, ws);
c1795bb0 545 }
c5a8c3ec
JS
546}
547
23707811
JH
548static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
549{
550 const char *cp;
551 unsigned long allot;
552 size_t l = len;
553
554 if (ecb->truncate)
555 return ecb->truncate(line, len);
556 cp = line;
557 allot = l;
558 while (0 < l) {
559 (void) utf8_width(&cp, &l);
560 if (!cp)
561 break; /* truncated in the middle? */
562 }
563 return allot - l;
564}
565
cd112cef 566static void fn_out_consume(void *priv, char *line, unsigned long len)
6973dcae
JH
567{
568 int i;
448c3ef1 569 int color;
6973dcae 570 struct emit_callback *ecbdata = priv;
472ca780
JK
571 const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
572 const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
ce436973 573 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
6973dcae 574
34a5e1a2
JS
575 *(ecbdata->found_changesp) = 1;
576
6973dcae 577 if (ecbdata->label_path[0]) {
1a9eb3b9
JH
578 const char *name_a_tab, *name_b_tab;
579
580 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
581 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
582
c0c77734
DB
583 fprintf(ecbdata->file, "%s--- %s%s%s\n",
584 meta, ecbdata->label_path[0], reset, name_a_tab);
585 fprintf(ecbdata->file, "%s+++ %s%s%s\n",
586 meta, ecbdata->label_path[1], reset, name_b_tab);
6973dcae
JH
587 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
588 }
cd112cef 589
a624eaa7
JM
590 if (diff_suppress_blank_empty
591 && len == 2 && line[0] == ' ' && line[1] == '\n') {
592 line[0] = '\n';
593 len = 1;
594 }
595
cd112cef
JS
596 /* This is not really necessary for now because
597 * this codepath only deals with two-way diffs.
598 */
599 for (i = 0; i < len && line[i] == '@'; i++)
600 ;
601 if (2 <= i && i < len && line[i] == ' ') {
602 ecbdata->nparents = i - 1;
23707811 603 len = sane_truncate_line(ecbdata, line, len);
c0c77734
DB
604 emit_line(ecbdata->file,
605 diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
448c3ef1 606 reset, line, len);
23707811 607 if (line[len-1] != '\n')
c0c77734 608 putc('\n', ecbdata->file);
448c3ef1 609 return;
cd112cef 610 }
448c3ef1
JH
611
612 if (len < ecbdata->nparents) {
c0c77734 613 emit_line(ecbdata->file, reset, reset, line, len);
448c3ef1 614 return;
cd112cef 615 }
448c3ef1
JH
616
617 color = DIFF_PLAIN;
618 if (ecbdata->diff_words && ecbdata->nparents != 1)
619 /* fall back to normal diff */
620 free_diff_words_data(ecbdata);
621 if (ecbdata->diff_words) {
622 if (line[0] == '-') {
623 diff_words_append(line, len,
624 &ecbdata->diff_words->minus);
625 return;
626 } else if (line[0] == '+') {
627 diff_words_append(line, len,
628 &ecbdata->diff_words->plus);
629 return;
630 }
631 if (ecbdata->diff_words->minus.text.size ||
632 ecbdata->diff_words->plus.text.size)
633 diff_words_show(ecbdata->diff_words);
634 line++;
50f575fc 635 len--;
c0c77734 636 emit_line(ecbdata->file, plain, reset, line, len);
448c3ef1
JH
637 return;
638 }
639 for (i = 0; i < ecbdata->nparents && len; i++) {
640 if (line[i] == '-')
641 color = DIFF_FILE_OLD;
642 else if (line[i] == '+')
643 color = DIFF_FILE_NEW;
644 }
645
646 if (color != DIFF_FILE_NEW) {
c0c77734
DB
647 emit_line(ecbdata->file,
648 diff_get_color(ecbdata->color_diff, color),
448c3ef1
JH
649 reset, line, len);
650 return;
651 }
652 emit_add_line(reset, ecbdata, line, len);
6973dcae
JH
653}
654
655static char *pprint_rename(const char *a, const char *b)
656{
657 const char *old = a;
658 const char *new = b;
663af342 659 struct strbuf name;
6973dcae
JH
660 int pfx_length, sfx_length;
661 int len_a = strlen(a);
662 int len_b = strlen(b);
663af342 663 int a_midlen, b_midlen;
e5bfbf9b
AJ
664 int qlen_a = quote_c_style(a, NULL, NULL, 0);
665 int qlen_b = quote_c_style(b, NULL, NULL, 0);
666
663af342 667 strbuf_init(&name, 0);
e5bfbf9b 668 if (qlen_a || qlen_b) {
663af342
PH
669 quote_c_style(a, &name, NULL, 0);
670 strbuf_addstr(&name, " => ");
671 quote_c_style(b, &name, NULL, 0);
b315c5c0 672 return strbuf_detach(&name, NULL);
e5bfbf9b 673 }
6973dcae
JH
674
675 /* Find common prefix */
676 pfx_length = 0;
677 while (*old && *new && *old == *new) {
678 if (*old == '/')
679 pfx_length = old - a + 1;
680 old++;
681 new++;
682 }
683
684 /* Find common suffix */
685 old = a + len_a;
686 new = b + len_b;
687 sfx_length = 0;
688 while (a <= old && b <= new && *old == *new) {
689 if (*old == '/')
690 sfx_length = len_a - (old - a);
691 old--;
692 new--;
693 }
694
695 /*
696 * pfx{mid-a => mid-b}sfx
697 * {pfx-a => pfx-b}sfx
698 * pfx{sfx-a => sfx-b}
699 * name-a => name-b
700 */
663af342
PH
701 a_midlen = len_a - pfx_length - sfx_length;
702 b_midlen = len_b - pfx_length - sfx_length;
703 if (a_midlen < 0)
704 a_midlen = 0;
705 if (b_midlen < 0)
706 b_midlen = 0;
707
708 strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
6973dcae 709 if (pfx_length + sfx_length) {
663af342
PH
710 strbuf_add(&name, a, pfx_length);
711 strbuf_addch(&name, '{');
6973dcae 712 }
663af342
PH
713 strbuf_add(&name, a + pfx_length, a_midlen);
714 strbuf_addstr(&name, " => ");
715 strbuf_add(&name, b + pfx_length, b_midlen);
716 if (pfx_length + sfx_length) {
717 strbuf_addch(&name, '}');
718 strbuf_add(&name, a + len_a - sfx_length, sfx_length);
6973dcae 719 }
b315c5c0 720 return strbuf_detach(&name, NULL);
6973dcae
JH
721}
722
723struct diffstat_t {
724 struct xdiff_emit_state xm;
725
726 int nr;
727 int alloc;
728 struct diffstat_file {
f604652e 729 char *from_name;
6973dcae 730 char *name;
f604652e 731 char *print_name;
6973dcae
JH
732 unsigned is_unmerged:1;
733 unsigned is_binary:1;
734 unsigned is_renamed:1;
735 unsigned int added, deleted;
736 } **files;
737};
738
739static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
740 const char *name_a,
741 const char *name_b)
742{
743 struct diffstat_file *x;
744 x = xcalloc(sizeof (*x), 1);
745 if (diffstat->nr == diffstat->alloc) {
746 diffstat->alloc = alloc_nr(diffstat->alloc);
747 diffstat->files = xrealloc(diffstat->files,
748 diffstat->alloc * sizeof(x));
749 }
750 diffstat->files[diffstat->nr++] = x;
751 if (name_b) {
f604652e
JH
752 x->from_name = xstrdup(name_a);
753 x->name = xstrdup(name_b);
6973dcae
JH
754 x->is_renamed = 1;
755 }
f604652e
JH
756 else {
757 x->from_name = NULL;
9befac47 758 x->name = xstrdup(name_a);
f604652e 759 }
6973dcae
JH
760 return x;
761}
762
763static void diffstat_consume(void *priv, char *line, unsigned long len)
764{
765 struct diffstat_t *diffstat = priv;
766 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
767
768 if (line[0] == '+')
769 x->added++;
770 else if (line[0] == '-')
771 x->deleted++;
772}
773
698ce6f8 774const char mime_boundary_leader[] = "------------";
6973dcae 775
a2540023
JH
776static int scale_linear(int it, int width, int max_change)
777{
778 /*
3ed74e60
JS
779 * make sure that at least one '-' is printed if there were deletions,
780 * and likewise for '+'.
a2540023 781 */
3ed74e60
JS
782 if (max_change < 2)
783 return it;
784 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
a2540023
JH
785}
786
c0c77734
DB
787static void show_name(FILE *file,
788 const char *prefix, const char *name, int len,
785f7432 789 const char *reset, const char *set)
a2540023 790{
c0c77734 791 fprintf(file, " %s%s%-*s%s |", set, prefix, len, name, reset);
a2540023
JH
792}
793
c0c77734 794static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
a2540023
JH
795{
796 if (cnt <= 0)
797 return;
c0c77734 798 fprintf(file, "%s", set);
a2540023 799 while (cnt--)
c0c77734
DB
800 putc(ch, file);
801 fprintf(file, "%s", reset);
a2540023
JH
802}
803
f604652e
JH
804static void fill_print_name(struct diffstat_file *file)
805{
806 char *pname;
807
808 if (file->print_name)
809 return;
810
811 if (!file->is_renamed) {
812 struct strbuf buf;
813 strbuf_init(&buf, 0);
814 if (quote_c_style(file->name, &buf, NULL, 0)) {
815 pname = strbuf_detach(&buf, NULL);
816 } else {
817 pname = file->name;
818 strbuf_release(&buf);
819 }
820 } else {
821 pname = pprint_rename(file->from_name, file->name);
822 }
823 file->print_name = pname;
824}
825
a2540023 826static void show_stats(struct diffstat_t* data, struct diff_options *options)
6973dcae 827{
6973dcae 828 int i, len, add, del, total, adds = 0, dels = 0;
a2540023 829 int max_change = 0, max_len = 0;
6973dcae 830 int total_files = data->nr;
a2540023 831 int width, name_width;
785f7432 832 const char *reset, *set, *add_c, *del_c;
6973dcae
JH
833
834 if (data->nr == 0)
835 return;
836
a2540023
JH
837 width = options->stat_width ? options->stat_width : 80;
838 name_width = options->stat_name_width ? options->stat_name_width : 50;
839
840 /* Sanity: give at least 5 columns to the graph,
841 * but leave at least 10 columns for the name.
842 */
861d1af3
OM
843 if (width < 25)
844 width = 25;
845 if (name_width < 10)
846 name_width = 10;
847 else if (width < name_width + 15)
848 name_width = width - 15;
a2540023
JH
849
850 /* Find the longest filename and max number of changes */
8f67f8ae
PH
851 reset = diff_get_color_opt(options, DIFF_RESET);
852 set = diff_get_color_opt(options, DIFF_PLAIN);
853 add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
854 del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
785f7432 855
6973dcae
JH
856 for (i = 0; i < data->nr; i++) {
857 struct diffstat_file *file = data->files[i];
a2540023 858 int change = file->added + file->deleted;
f604652e
JH
859 fill_print_name(file);
860 len = strlen(file->print_name);
6973dcae
JH
861 if (max_len < len)
862 max_len = len;
863
864 if (file->is_binary || file->is_unmerged)
865 continue;
a2540023
JH
866 if (max_change < change)
867 max_change = change;
6973dcae
JH
868 }
869
a2540023
JH
870 /* Compute the width of the graph part;
871 * 10 is for one blank at the beginning of the line plus
872 * " | count " between the name and the graph.
873 *
874 * From here on, name_width is the width of the name area,
875 * and width is the width of the graph area.
876 */
877 name_width = (name_width < max_len) ? name_width : max_len;
878 if (width < (name_width + 10) + max_change)
879 width = width - (name_width + 10);
880 else
881 width = max_change;
882
6973dcae 883 for (i = 0; i < data->nr; i++) {
d2543b8e 884 const char *prefix = "";
f604652e 885 char *name = data->files[i]->print_name;
6973dcae
JH
886 int added = data->files[i]->added;
887 int deleted = data->files[i]->deleted;
a2540023 888 int name_len;
6973dcae
JH
889
890 /*
891 * "scale" the filename
892 */
a2540023
JH
893 len = name_width;
894 name_len = strlen(name);
895 if (name_width < name_len) {
6973dcae
JH
896 char *slash;
897 prefix = "...";
a2540023
JH
898 len -= 3;
899 name += name_len - len;
6973dcae
JH
900 slash = strchr(name, '/');
901 if (slash)
902 name = slash;
903 }
6973dcae
JH
904
905 if (data->files[i]->is_binary) {
c0c77734
DB
906 show_name(options->file, prefix, name, len, reset, set);
907 fprintf(options->file, " Bin ");
908 fprintf(options->file, "%s%d%s", del_c, deleted, reset);
909 fprintf(options->file, " -> ");
910 fprintf(options->file, "%s%d%s", add_c, added, reset);
911 fprintf(options->file, " bytes");
912 fprintf(options->file, "\n");
f604652e 913 continue;
6973dcae
JH
914 }
915 else if (data->files[i]->is_unmerged) {
c0c77734
DB
916 show_name(options->file, prefix, name, len, reset, set);
917 fprintf(options->file, " Unmerged\n");
f604652e 918 continue;
6973dcae
JH
919 }
920 else if (!data->files[i]->is_renamed &&
921 (added + deleted == 0)) {
922 total_files--;
f604652e 923 continue;
6973dcae
JH
924 }
925
a2540023
JH
926 /*
927 * scale the add/delete
928 */
6973dcae
JH
929 add = added;
930 del = deleted;
931 total = add + del;
932 adds += add;
933 dels += del;
934
a2540023 935 if (width <= max_change) {
a2540023 936 add = scale_linear(add, width, max_change);
3ed74e60
JS
937 del = scale_linear(del, width, max_change);
938 total = add + del;
6973dcae 939 }
c0c77734 940 show_name(options->file, prefix, name, len, reset, set);
4d9b5359
JK
941 fprintf(options->file, "%5d%s", added + deleted,
942 added + deleted ? " " : "");
c0c77734
DB
943 show_graph(options->file, '+', add, add_c, reset);
944 show_graph(options->file, '-', del, del_c, reset);
945 fprintf(options->file, "\n");
946 }
947 fprintf(options->file,
948 "%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
785f7432 949 set, total_files, adds, dels, reset);
6973dcae
JH
950}
951
c0c77734 952static void show_shortstats(struct diffstat_t* data, struct diff_options *options)
ebd124c6
NP
953{
954 int i, adds = 0, dels = 0, total_files = data->nr;
955
956 if (data->nr == 0)
957 return;
958
959 for (i = 0; i < data->nr; i++) {
960 if (!data->files[i]->is_binary &&
961 !data->files[i]->is_unmerged) {
962 int added = data->files[i]->added;
963 int deleted= data->files[i]->deleted;
964 if (!data->files[i]->is_renamed &&
965 (added + deleted == 0)) {
966 total_files--;
967 } else {
968 adds += added;
969 dels += deleted;
970 }
971 }
ebd124c6 972 }
c0c77734 973 fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
ebd124c6
NP
974 total_files, adds, dels);
975}
976
74e2abe5
JH
977static void show_numstat(struct diffstat_t* data, struct diff_options *options)
978{
979 int i;
980
f604652e
JH
981 if (data->nr == 0)
982 return;
983
74e2abe5
JH
984 for (i = 0; i < data->nr; i++) {
985 struct diffstat_file *file = data->files[i];
986
bfddbc5e 987 if (file->is_binary)
c0c77734 988 fprintf(options->file, "-\t-\t");
bfddbc5e 989 else
c0c77734
DB
990 fprintf(options->file,
991 "%d\t%d\t", file->added, file->deleted);
f604652e
JH
992 if (options->line_termination) {
993 fill_print_name(file);
994 if (!file->is_renamed)
c0c77734 995 write_name_quoted(file->name, options->file,
f604652e
JH
996 options->line_termination);
997 else {
c0c77734
DB
998 fputs(file->print_name, options->file);
999 putc(options->line_termination, options->file);
f604652e 1000 }
663af342 1001 } else {
f604652e 1002 if (file->is_renamed) {
c0c77734
DB
1003 putc('\0', options->file);
1004 write_name_quoted(file->from_name, options->file, '\0');
f604652e 1005 }
c0c77734 1006 write_name_quoted(file->name, options->file, '\0');
663af342 1007 }
74e2abe5
JH
1008 }
1009}
1010
c04a7155
JH
1011struct dirstat_file {
1012 const char *name;
1013 unsigned long changed;
7df7c019
LT
1014};
1015
c04a7155
JH
1016struct dirstat_dir {
1017 struct dirstat_file *files;
1018 int alloc, nr, percent, cumulative;
1019};
1020
1021static long gather_dirstat(FILE *file, struct dirstat_dir *dir, unsigned long changed, const char *base, int baselen)
7df7c019
LT
1022{
1023 unsigned long this_dir = 0;
1024 unsigned int sources = 0;
1025
1026 while (dir->nr) {
c04a7155 1027 struct dirstat_file *f = dir->files;
7df7c019
LT
1028 int namelen = strlen(f->name);
1029 unsigned long this;
1030 char *slash;
1031
1032 if (namelen < baselen)
1033 break;
1034 if (memcmp(f->name, base, baselen))
1035 break;
1036 slash = strchr(f->name + baselen, '/');
1037 if (slash) {
1038 int newbaselen = slash + 1 - f->name;
c0c77734 1039 this = gather_dirstat(file, dir, changed, f->name, newbaselen);
7df7c019
LT
1040 sources++;
1041 } else {
c04a7155 1042 this = f->changed;
7df7c019
LT
1043 dir->files++;
1044 dir->nr--;
1045 sources += 2;
1046 }
1047 this_dir += this;
1048 }
1049
1050 /*
1051 * We don't report dirstat's for
1052 * - the top level
1053 * - or cases where everything came from a single directory
1054 * under this directory (sources == 1).
1055 */
1056 if (baselen && sources != 1) {
1057 int permille = this_dir * 1000 / changed;
1058 if (permille) {
1059 int percent = permille / 10;
1060 if (percent >= dir->percent) {
c0c77734 1061 fprintf(file, "%4d.%01d%% %.*s\n", percent, permille % 10, baselen, base);
7df7c019
LT
1062 if (!dir->cumulative)
1063 return 0;
1064 }
1065 }
1066 }
1067 return this_dir;
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;
1081 dir.cumulative = options->output_format & DIFF_FORMAT_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
1113 * made to the preimage.
1114 */
1115 damage = (p->one->size - copied) + added;
1116
1117 ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
1118 dir.files[dir.nr].name = name;
1119 dir.files[dir.nr].changed = damage;
1120 changed += damage;
1121 dir.nr++;
7df7c019
LT
1122 }
1123
1124 /* This can happen even with many files, if everything was renames */
1125 if (!changed)
1126 return;
1127
1128 /* Show all directories with more than x% of the changes */
c0c77734 1129 gather_dirstat(options->file, &dir, changed, "", 0);
7df7c019
LT
1130}
1131
f604652e
JH
1132static void free_diffstat_info(struct diffstat_t *diffstat)
1133{
1134 int i;
1135 for (i = 0; i < diffstat->nr; i++) {
1136 struct diffstat_file *f = diffstat->files[i];
1137 if (f->name != f->print_name)
1138 free(f->print_name);
1139 free(f->name);
1140 free(f->from_name);
1141 free(f);
1142 }
1143 free(diffstat->files);
1144}
1145
88246898
JS
1146struct checkdiff_t {
1147 struct xdiff_emit_state xm;
1148 const char *filename;
1ba111d1
JH
1149 int lineno;
1150 struct diff_options *o;
cf1b7869 1151 unsigned ws_rule;
62c64895 1152 unsigned status;
877f23cc 1153 int trailing_blanks_start;
88246898
JS
1154};
1155
04954043
JH
1156static int is_conflict_marker(const char *line, unsigned long len)
1157{
1158 char firstchar;
1159 int cnt;
1160
1161 if (len < 8)
1162 return 0;
1163 firstchar = line[0];
1164 switch (firstchar) {
1165 case '=': case '>': case '<':
1166 break;
1167 default:
1168 return 0;
1169 }
1170 for (cnt = 1; cnt < 7; cnt++)
1171 if (line[cnt] != firstchar)
1172 return 0;
1173 /* line[0] thru line[6] are same as firstchar */
1174 if (firstchar == '=') {
1175 /* divider between ours and theirs? */
1176 if (len != 8 || line[7] != '\n')
1177 return 0;
1178 } else if (len < 8 || !isspace(line[7])) {
1179 /* not divider before ours nor after theirs */
1180 return 0;
1181 }
1182 return 1;
1183}
1184
88246898
JS
1185static void checkdiff_consume(void *priv, char *line, unsigned long len)
1186{
1187 struct checkdiff_t *data = priv;
1ba111d1
JH
1188 int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
1189 const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
1190 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1191 const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
c1795bb0 1192 char *err;
88246898
JS
1193
1194 if (line[0] == '+') {
18374e58 1195 unsigned bad;
0ef617f4 1196 data->lineno++;
877f23cc
JH
1197 if (!ws_blank_line(line + 1, len - 1, data->ws_rule))
1198 data->trailing_blanks_start = 0;
1199 else if (!data->trailing_blanks_start)
1200 data->trailing_blanks_start = data->lineno;
04954043
JH
1201 if (is_conflict_marker(line + 1, len - 1)) {
1202 data->status |= 1;
1203 fprintf(data->o->file,
1204 "%s:%d: leftover conflict marker\n",
1205 data->filename, data->lineno);
1206 }
8f8841e9 1207 bad = ws_check(line + 1, len - 1, data->ws_rule);
18374e58 1208 if (!bad)
c1795bb0 1209 return;
18374e58
JH
1210 data->status |= bad;
1211 err = whitespace_error_string(bad);
1ba111d1
JH
1212 fprintf(data->o->file, "%s:%d: %s.\n",
1213 data->filename, data->lineno, err);
c1795bb0 1214 free(err);
1ba111d1 1215 emit_line(data->o->file, set, reset, line, 1);
8f8841e9 1216 ws_check_emit(line + 1, len - 1, data->ws_rule,
1ba111d1 1217 data->o->file, set, reset, ws);
877f23cc 1218 } else if (line[0] == ' ') {
88246898 1219 data->lineno++;
877f23cc
JH
1220 data->trailing_blanks_start = 0;
1221 } else if (line[0] == '@') {
88246898
JS
1222 char *plus = strchr(line, '+');
1223 if (plus)
0ef617f4 1224 data->lineno = strtol(plus, NULL, 10) - 1;
88246898
JS
1225 else
1226 die("invalid diff");
877f23cc 1227 data->trailing_blanks_start = 0;
88246898
JS
1228 }
1229}
1230
0660626c
JH
1231static unsigned char *deflate_it(char *data,
1232 unsigned long size,
1233 unsigned long *result_size)
051308f6 1234{
0660626c
JH
1235 int bound;
1236 unsigned char *deflated;
1237 z_stream stream;
1238
1239 memset(&stream, 0, sizeof(stream));
12f6c308 1240 deflateInit(&stream, zlib_compression_level);
0660626c
JH
1241 bound = deflateBound(&stream, size);
1242 deflated = xmalloc(bound);
1243 stream.next_out = deflated;
1244 stream.avail_out = bound;
1245
1246 stream.next_in = (unsigned char *)data;
1247 stream.avail_in = size;
1248 while (deflate(&stream, Z_FINISH) == Z_OK)
1249 ; /* nothing */
1250 deflateEnd(&stream);
1251 *result_size = stream.total_out;
1252 return deflated;
051308f6
JH
1253}
1254
c0c77734 1255static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two)
051308f6 1256{
0660626c
JH
1257 void *cp;
1258 void *delta;
1259 void *deflated;
1260 void *data;
1261 unsigned long orig_size;
1262 unsigned long delta_size;
1263 unsigned long deflate_size;
1264 unsigned long data_size;
051308f6 1265
0660626c
JH
1266 /* We could do deflated delta, or we could do just deflated two,
1267 * whichever is smaller.
051308f6 1268 */
0660626c
JH
1269 delta = NULL;
1270 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1271 if (one->size && two->size) {
1272 delta = diff_delta(one->ptr, one->size,
1273 two->ptr, two->size,
1274 &delta_size, deflate_size);
1275 if (delta) {
1276 void *to_free = delta;
1277 orig_size = delta_size;
1278 delta = deflate_it(delta, delta_size, &delta_size);
1279 free(to_free);
051308f6
JH
1280 }
1281 }
051308f6 1282
0660626c 1283 if (delta && delta_size < deflate_size) {
c0c77734 1284 fprintf(file, "delta %lu\n", orig_size);
0660626c
JH
1285 free(deflated);
1286 data = delta;
1287 data_size = delta_size;
1288 }
1289 else {
c0c77734 1290 fprintf(file, "literal %lu\n", two->size);
0660626c
JH
1291 free(delta);
1292 data = deflated;
1293 data_size = deflate_size;
1294 }
051308f6 1295
0660626c
JH
1296 /* emit data encoded in base85 */
1297 cp = data;
1298 while (data_size) {
1299 int bytes = (52 < data_size) ? 52 : data_size;
051308f6 1300 char line[70];
0660626c 1301 data_size -= bytes;
051308f6
JH
1302 if (bytes <= 26)
1303 line[0] = bytes + 'A' - 1;
1304 else
1305 line[0] = bytes - 26 + 'a' - 1;
1306 encode_85(line + 1, cp, bytes);
1d7f171c 1307 cp = (char *) cp + bytes;
c0c77734
DB
1308 fputs(line, file);
1309 fputc('\n', file);
051308f6 1310 }
c0c77734 1311 fprintf(file, "\n");
0660626c 1312 free(data);
051308f6
JH
1313}
1314
c0c77734 1315static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two)
d4c452f0 1316{
c0c77734
DB
1317 fprintf(file, "GIT binary patch\n");
1318 emit_binary_diff_body(file, one, two);
1319 emit_binary_diff_body(file, two, one);
d4c452f0
JH
1320}
1321
8c701249
JH
1322static void setup_diff_attr_check(struct git_attr_check *check)
1323{
1324 static struct git_attr *attr_diff;
1325
29a3eefd 1326 if (!attr_diff) {
8c701249 1327 attr_diff = git_attr("diff", 4);
29a3eefd
JH
1328 }
1329 check[0].attr = attr_diff;
8c701249
JH
1330}
1331
29a3eefd 1332static void diff_filespec_check_attr(struct diff_filespec *one)
6973dcae 1333{
e0e324a4 1334 struct git_attr_check attr_diff_check;
2c3fa66f 1335 int check_from_data = 0;
8c701249 1336
29a3eefd
JH
1337 if (one->checked_attr)
1338 return;
1339
e0e324a4 1340 setup_diff_attr_check(&attr_diff_check);
29a3eefd 1341 one->is_binary = 0;
e0e324a4 1342 one->funcname_pattern_ident = NULL;
29a3eefd 1343
e0e324a4 1344 if (!git_checkattr(one->path, 1, &attr_diff_check)) {
29a3eefd
JH
1345 const char *value;
1346
1347 /* binaryness */
e0e324a4 1348 value = attr_diff_check.value;
515106fa 1349 if (ATTR_TRUE(value))
29a3eefd 1350 ;
515106fa 1351 else if (ATTR_FALSE(value))
29a3eefd 1352 one->is_binary = 1;
2c3fa66f
JH
1353 else
1354 check_from_data = 1;
f258475a 1355
e0e324a4 1356 /* funcname pattern ident */
f258475a
JH
1357 if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
1358 ;
1359 else
e0e324a4 1360 one->funcname_pattern_ident = value;
515106fa 1361 }
40250af4 1362
2c3fa66f
JH
1363 if (check_from_data) {
1364 if (!one->data && DIFF_FILE_VALID(one))
1365 diff_populate_filespec(one, 0);
29a3eefd 1366
2c3fa66f
JH
1367 if (one->data)
1368 one->is_binary = buffer_is_binary(one->data, one->size);
1369 }
29a3eefd
JH
1370}
1371
1372int diff_filespec_is_binary(struct diff_filespec *one)
1373{
1374 diff_filespec_check_attr(one);
1375 return one->is_binary;
6973dcae
JH
1376}
1377
e0e324a4 1378static const char *funcname_pattern(const char *ident)
f258475a 1379{
e0e324a4 1380 struct funcname_pattern *pp;
f258475a 1381
e0e324a4
JH
1382 for (pp = funcname_pattern_list; pp; pp = pp->next)
1383 if (!strcmp(ident, pp->name))
1384 return pp->pattern;
f258475a
JH
1385 return NULL;
1386}
1387
d3a93dc9
JH
1388static struct builtin_funcname_pattern {
1389 const char *name;
1390 const char *pattern;
1391} builtin_funcname_pattern[] = {
1392 { "java", "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
1393 "new\\|return\\|switch\\|throw\\|while\\)\n"
1394 "^[ ]*\\(\\([ ]*"
1395 "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
14a5c7c1 1396 "[ ]*([^;]*\\)$" },
b50005b7
AP
1397 { "pascal", "^\\(\\(procedure\\|function\\|constructor\\|"
1398 "destructor\\|interface\\|implementation\\|"
1399 "initialization\\|finalization\\)[ \t]*.*\\)$"
1400 "\\|"
1401 "^\\(.*=[ \t]*\\(class\\|record\\).*\\)$"
1402 },
23b5beb2 1403 { "bibtex", "\\(@[a-zA-Z]\\{1,\\}[ \t]*{\\{0,1\\}[ \t]*[^ \t\"@',\\#}{~%]*\\).*$" },
807d8694 1404 { "tex", "^\\(\\\\\\(\\(sub\\)*section\\|chapter\\|part\\)\\*\\{0,1\\}{.*\\)$" },
ad8c1d92 1405 { "ruby", "^\\s*\\(\\(class\\|module\\|def\\)\\s.*\\)$" },
d3a93dc9
JH
1406};
1407
e0e324a4 1408static const char *diff_funcname_pattern(struct diff_filespec *one)
f258475a 1409{
e0e324a4 1410 const char *ident, *pattern;
d3a93dc9 1411 int i;
f258475a
JH
1412
1413 diff_filespec_check_attr(one);
e0e324a4 1414 ident = one->funcname_pattern_ident;
f258475a
JH
1415
1416 if (!ident)
1417 /*
1418 * If the config file has "funcname.default" defined, that
1419 * regexp is used; otherwise NULL is returned and xemit uses
1420 * the built-in default.
1421 */
e0e324a4 1422 return funcname_pattern("default");
f258475a
JH
1423
1424 /* Look up custom "funcname.$ident" regexp from config. */
e0e324a4
JH
1425 pattern = funcname_pattern(ident);
1426 if (pattern)
1427 return pattern;
f258475a
JH
1428
1429 /*
1430 * And define built-in fallback patterns here. Note that
9f6fe822 1431 * these can be overridden by the user's config settings.
f258475a 1432 */
d3a93dc9
JH
1433 for (i = 0; i < ARRAY_SIZE(builtin_funcname_pattern); i++)
1434 if (!strcmp(ident, builtin_funcname_pattern[i].name))
1435 return builtin_funcname_pattern[i].pattern;
f258475a
JH
1436
1437 return NULL;
1438}
1439
6973dcae
JH
1440static void builtin_diff(const char *name_a,
1441 const char *name_b,
1442 struct diff_filespec *one,
1443 struct diff_filespec *two,
1444 const char *xfrm_msg,
051308f6 1445 struct diff_options *o,
6973dcae
JH
1446 int complete_rewrite)
1447{
1448 mmfile_t mf1, mf2;
1449 const char *lbl[2];
1450 char *a_one, *b_two;
8f67f8ae
PH
1451 const char *set = diff_get_color_opt(o, DIFF_METAINFO);
1452 const char *reset = diff_get_color_opt(o, DIFF_RESET);
6973dcae 1453
eab9a40b
JS
1454 a_one = quote_two(o->a_prefix, name_a + (*name_a == '/'));
1455 b_two = quote_two(o->b_prefix, name_b + (*name_b == '/'));
6973dcae
JH
1456 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1457 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
c0c77734 1458 fprintf(o->file, "%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
6973dcae
JH
1459 if (lbl[0][0] == '/') {
1460 /* /dev/null */
c0c77734 1461 fprintf(o->file, "%snew file mode %06o%s\n", set, two->mode, reset);
50f575fc 1462 if (xfrm_msg && xfrm_msg[0])
c0c77734 1463 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1464 }
1465 else if (lbl[1][0] == '/') {
c0c77734 1466 fprintf(o->file, "%sdeleted file mode %06o%s\n", set, one->mode, reset);
50f575fc 1467 if (xfrm_msg && xfrm_msg[0])
c0c77734 1468 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1469 }
1470 else {
1471 if (one->mode != two->mode) {
c0c77734
DB
1472 fprintf(o->file, "%sold mode %06o%s\n", set, one->mode, reset);
1473 fprintf(o->file, "%snew mode %06o%s\n", set, two->mode, reset);
cd112cef 1474 }
50f575fc 1475 if (xfrm_msg && xfrm_msg[0])
c0c77734 1476 fprintf(o->file, "%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1477 /*
1478 * we do not run diff between different kind
1479 * of objects.
1480 */
1481 if ((one->mode ^ two->mode) & S_IFMT)
1482 goto free_ab_and_return;
1483 if (complete_rewrite) {
eab9a40b 1484 emit_rewrite_diff(name_a, name_b, one, two, o);
34a5e1a2 1485 o->found_changes = 1;
6973dcae
JH
1486 goto free_ab_and_return;
1487 }
1488 }
1489
1490 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1491 die("unable to read files to diff");
1492
8f67f8ae 1493 if (!DIFF_OPT_TST(o, TEXT) &&
29a3eefd 1494 (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
0660626c
JH
1495 /* Quite common confusing case */
1496 if (mf1.size == mf2.size &&
1497 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1498 goto free_ab_and_return;
8f67f8ae 1499 if (DIFF_OPT_TST(o, BINARY))
c0c77734 1500 emit_binary_diff(o->file, &mf1, &mf2);
051308f6 1501 else
c0c77734
DB
1502 fprintf(o->file, "Binary files %s and %s differ\n",
1503 lbl[0], lbl[1]);
34a5e1a2 1504 o->found_changes = 1;
051308f6 1505 }
6973dcae
JH
1506 else {
1507 /* Crazy xdl interfaces.. */
1508 const char *diffopts = getenv("GIT_DIFF_OPTS");
1509 xpparam_t xpp;
1510 xdemitconf_t xecfg;
1511 xdemitcb_t ecb;
1512 struct emit_callback ecbdata;
e0e324a4 1513 const char *funcname_pattern;
f258475a 1514
e0e324a4
JH
1515 funcname_pattern = diff_funcname_pattern(one);
1516 if (!funcname_pattern)
1517 funcname_pattern = diff_funcname_pattern(two);
6973dcae 1518
30b25010 1519 memset(&xecfg, 0, sizeof(xecfg));
cd112cef 1520 memset(&ecbdata, 0, sizeof(ecbdata));
6973dcae 1521 ecbdata.label_path = lbl;
8f67f8ae 1522 ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
34a5e1a2 1523 ecbdata.found_changesp = &o->found_changes;
cf1b7869 1524 ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
c0c77734 1525 ecbdata.file = o->file;
0d21efa5 1526 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
ee1e5412 1527 xecfg.ctxlen = o->context;
6973dcae 1528 xecfg.flags = XDL_EMIT_FUNCNAMES;
e0e324a4
JH
1529 if (funcname_pattern)
1530 xdiff_set_find_func(&xecfg, funcname_pattern);
6973dcae
JH
1531 if (!diffopts)
1532 ;
cc44c765 1533 else if (!prefixcmp(diffopts, "--unified="))
6973dcae 1534 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
cc44c765 1535 else if (!prefixcmp(diffopts, "-u"))
6973dcae 1536 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
cd112cef 1537 ecb.outf = xdiff_outf;
6973dcae 1538 ecb.priv = &ecbdata;
cd112cef 1539 ecbdata.xm.consume = fn_out_consume;
c0c77734 1540 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
f59a59e2
JS
1541 ecbdata.diff_words =
1542 xcalloc(1, sizeof(struct diff_words_data));
c0c77734
DB
1543 ecbdata.diff_words->file = o->file;
1544 }
c279d7e9 1545 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
8f67f8ae 1546 if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
f59a59e2 1547 free_diff_words_data(&ecbdata);
6973dcae
JH
1548 }
1549
1550 free_ab_and_return:
fc3abdf5
JH
1551 diff_free_filespec_data(one);
1552 diff_free_filespec_data(two);
6973dcae
JH
1553 free(a_one);
1554 free(b_two);
1555 return;
1556}
1557
1558static void builtin_diffstat(const char *name_a, const char *name_b,
1559 struct diff_filespec *one,
1560 struct diff_filespec *two,
710158e3 1561 struct diffstat_t *diffstat,
0d21efa5 1562 struct diff_options *o,
710158e3 1563 int complete_rewrite)
6973dcae
JH
1564{
1565 mmfile_t mf1, mf2;
1566 struct diffstat_file *data;
1567
1568 data = diffstat_add(diffstat, name_a, name_b);
1569
1570 if (!one || !two) {
1571 data->is_unmerged = 1;
1572 return;
1573 }
710158e3
JH
1574 if (complete_rewrite) {
1575 diff_populate_filespec(one, 0);
1576 diff_populate_filespec(two, 0);
1577 data->deleted = count_lines(one->data, one->size);
1578 data->added = count_lines(two->data, two->size);
fc3abdf5 1579 goto free_and_return;
710158e3 1580 }
6973dcae
JH
1581 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1582 die("unable to read files to diff");
1583
29a3eefd 1584 if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
6973dcae 1585 data->is_binary = 1;
b1882587
AP
1586 data->added = mf2.size;
1587 data->deleted = mf1.size;
1588 } else {
6973dcae
JH
1589 /* Crazy xdl interfaces.. */
1590 xpparam_t xpp;
1591 xdemitconf_t xecfg;
1592 xdemitcb_t ecb;
1593
30b25010 1594 memset(&xecfg, 0, sizeof(xecfg));
0d21efa5 1595 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
6973dcae
JH
1596 ecb.outf = xdiff_outf;
1597 ecb.priv = diffstat;
c279d7e9 1598 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
6973dcae 1599 }
fc3abdf5
JH
1600
1601 free_and_return:
1602 diff_free_filespec_data(one);
1603 diff_free_filespec_data(two);
6973dcae
JH
1604}
1605
88246898 1606static void builtin_checkdiff(const char *name_a, const char *name_b,
cd676a51 1607 const char *attr_path,
5ff10dd6
JH
1608 struct diff_filespec *one,
1609 struct diff_filespec *two,
1610 struct diff_options *o)
88246898
JS
1611{
1612 mmfile_t mf1, mf2;
1613 struct checkdiff_t data;
1614
1615 if (!two)
1616 return;
1617
1618 memset(&data, 0, sizeof(data));
1619 data.xm.consume = checkdiff_consume;
1620 data.filename = name_b ? name_b : name_a;
1621 data.lineno = 0;
1ba111d1 1622 data.o = o;
cd676a51 1623 data.ws_rule = whitespace_rule(attr_path);
88246898
JS
1624
1625 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1626 die("unable to read files to diff");
1627
5ff10dd6
JH
1628 /*
1629 * All the other codepaths check both sides, but not checking
1630 * the "old" side here is deliberate. We are checking the newly
1631 * introduced changes, and as long as the "new" side is text, we
1632 * can and should check what it introduces.
1633 */
29a3eefd 1634 if (diff_filespec_is_binary(two))
fc3abdf5 1635 goto free_and_return;
88246898
JS
1636 else {
1637 /* Crazy xdl interfaces.. */
1638 xpparam_t xpp;
1639 xdemitconf_t xecfg;
1640 xdemitcb_t ecb;
1641
30b25010 1642 memset(&xecfg, 0, sizeof(xecfg));
88246898 1643 xpp.flags = XDF_NEED_MINIMAL;
88246898
JS
1644 ecb.outf = xdiff_outf;
1645 ecb.priv = &data;
c279d7e9 1646 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
877f23cc 1647
04c6e9e9
JH
1648 if ((data.ws_rule & WS_TRAILING_SPACE) &&
1649 data.trailing_blanks_start) {
877f23cc
JH
1650 fprintf(o->file, "%s:%d: ends with blank lines.\n",
1651 data.filename, data.trailing_blanks_start);
1652 data.status = 1; /* report errors */
1653 }
88246898 1654 }
fc3abdf5
JH
1655 free_and_return:
1656 diff_free_filespec_data(one);
1657 diff_free_filespec_data(two);
62c64895
WC
1658 if (data.status)
1659 DIFF_OPT_SET(o, CHECK_FAILED);
88246898
JS
1660}
1661
6973dcae
JH
1662struct diff_filespec *alloc_filespec(const char *path)
1663{
1664 int namelen = strlen(path);
1665 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1666
1667 memset(spec, 0, sizeof(*spec));
1668 spec->path = (char *)(spec + 1);
1669 memcpy(spec->path, path, namelen+1);
9fb88419 1670 spec->count = 1;
6973dcae
JH
1671 return spec;
1672}
1673
9fb88419
LT
1674void free_filespec(struct diff_filespec *spec)
1675{
1676 if (!--spec->count) {
1677 diff_free_filespec_data(spec);
1678 free(spec);
1679 }
1680}
1681
6973dcae
JH
1682void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1683 unsigned short mode)
1684{
1685 if (mode) {
1686 spec->mode = canon_mode(mode);
e702496e 1687 hashcpy(spec->sha1, sha1);
0bef57ee 1688 spec->sha1_valid = !is_null_sha1(sha1);
6973dcae
JH
1689 }
1690}
1691
1692/*
5adf317b 1693 * Given a name and sha1 pair, if the index tells us the file in
6973dcae
JH
1694 * the work tree has that object contents, return true, so that
1695 * prepare_temp_file() does not have to inflate and extract.
1696 */
1510fea7 1697static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
6973dcae
JH
1698{
1699 struct cache_entry *ce;
1700 struct stat st;
1701 int pos, len;
1702
1703 /* We do not read the cache ourselves here, because the
1704 * benchmark with my previous version that always reads cache
1705 * shows that it makes things worse for diff-tree comparing
1706 * two linux-2.6 kernel trees in an already checked out work
1707 * tree. This is because most diff-tree comparisons deal with
1708 * only a small number of files, while reading the cache is
1709 * expensive for a large project, and its cost outweighs the
1710 * savings we get by not inflating the object to a temporary
1711 * file. Practically, this code only helps when we are used
1712 * by diff-cache --cached, which does read the cache before
1713 * calling us.
1714 */
1715 if (!active_cache)
1716 return 0;
1717
1510fea7
SP
1718 /* We want to avoid the working directory if our caller
1719 * doesn't need the data in a normal file, this system
1720 * is rather slow with its stat/open/mmap/close syscalls,
1721 * and the object is contained in a pack file. The pack
1722 * is probably already open and will be faster to obtain
1723 * the data through than the working directory. Loose
1724 * objects however would tend to be slower as they need
1725 * to be individually opened and inflated.
1726 */
5caf9232 1727 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1510fea7
SP
1728 return 0;
1729
6973dcae
JH
1730 len = strlen(name);
1731 pos = cache_name_pos(name, len);
1732 if (pos < 0)
1733 return 0;
1734 ce = active_cache[pos];
eadb5831
JH
1735
1736 /*
1737 * This is not the sha1 we are looking for, or
1738 * unreusable because it is not a regular file.
1739 */
1740 if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
6973dcae 1741 return 0;
eadb5831
JH
1742
1743 /*
1744 * If ce matches the file in the work tree, we can reuse it.
6973dcae 1745 */
eadb5831
JH
1746 if (ce_uptodate(ce) ||
1747 (!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
1748 return 1;
1749
1750 return 0;
6973dcae
JH
1751}
1752
3afaa72d
JH
1753static int populate_from_stdin(struct diff_filespec *s)
1754{
af6eb822 1755 struct strbuf buf;
c32f749f 1756 size_t size = 0;
af6eb822 1757
f1696ee3
PH
1758 strbuf_init(&buf, 0);
1759 if (strbuf_read(&buf, 0, 0) < 0)
af6eb822 1760 return error("error while reading from stdin %s",
3afaa72d 1761 strerror(errno));
af6eb822 1762
3afaa72d 1763 s->should_munmap = 0;
c32f749f
RS
1764 s->data = strbuf_detach(&buf, &size);
1765 s->size = size;
3afaa72d
JH
1766 s->should_free = 1;
1767 return 0;
1768}
1769
04786756
LT
1770static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
1771{
1772 int len;
1773 char *data = xmalloc(100);
1774 len = snprintf(data, 100,
1775 "Subproject commit %s\n", sha1_to_hex(s->sha1));
1776 s->data = data;
1777 s->size = len;
1778 s->should_free = 1;
1779 if (size_only) {
1780 s->data = NULL;
1781 free(data);
1782 }
1783 return 0;
1784}
1785
6973dcae
JH
1786/*
1787 * While doing rename detection and pickaxe operation, we may need to
1788 * grab the data for the blob (or file) for our own in-core comparison.
1789 * diff_filespec has data and size fields for this purpose.
1790 */
1791int diff_populate_filespec(struct diff_filespec *s, int size_only)
1792{
1793 int err = 0;
1794 if (!DIFF_FILE_VALID(s))
1795 die("internal error: asking to populate invalid file.");
1796 if (S_ISDIR(s->mode))
1797 return -1;
1798
6973dcae 1799 if (s->data)
fc3abdf5 1800 return 0;
04786756 1801
6e0b8ed6
JH
1802 if (size_only && 0 < s->size)
1803 return 0;
1804
302b9282 1805 if (S_ISGITLINK(s->mode))
04786756
LT
1806 return diff_populate_gitlink(s, size_only);
1807
6973dcae 1808 if (!s->sha1_valid ||
1510fea7 1809 reuse_worktree_file(s->path, s->sha1, 0)) {
5ecd293d 1810 struct strbuf buf;
6973dcae
JH
1811 struct stat st;
1812 int fd;
6c510bee 1813
3afaa72d
JH
1814 if (!strcmp(s->path, "-"))
1815 return populate_from_stdin(s);
1816
6973dcae
JH
1817 if (lstat(s->path, &st) < 0) {
1818 if (errno == ENOENT) {
1819 err_empty:
1820 err = -1;
1821 empty:
d2543b8e 1822 s->data = (char *)"";
6973dcae
JH
1823 s->size = 0;
1824 return err;
1825 }
1826 }
dc49cd76 1827 s->size = xsize_t(st.st_size);
6973dcae
JH
1828 if (!s->size)
1829 goto empty;
1830 if (size_only)
1831 return 0;
1832 if (S_ISLNK(st.st_mode)) {
1833 int ret;
1834 s->data = xmalloc(s->size);
1835 s->should_free = 1;
1836 ret = readlink(s->path, s->data, s->size);
1837 if (ret < 0) {
1838 free(s->data);
1839 goto err_empty;
1840 }
1841 return 0;
1842 }
1843 fd = open(s->path, O_RDONLY);
1844 if (fd < 0)
1845 goto err_empty;
c4712e45 1846 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 1847 close(fd);
6973dcae 1848 s->should_munmap = 1;
6c510bee
LT
1849
1850 /*
1851 * Convert from working tree format to canonical git format
1852 */
5ecd293d 1853 strbuf_init(&buf, 0);
21e5ad50 1854 if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
c32f749f 1855 size_t size = 0;
6c510bee
LT
1856 munmap(s->data, s->size);
1857 s->should_munmap = 0;
c32f749f
RS
1858 s->data = strbuf_detach(&buf, &size);
1859 s->size = size;
6c510bee
LT
1860 s->should_free = 1;
1861 }
6973dcae
JH
1862 }
1863 else {
21666f1a 1864 enum object_type type;
6e0b8ed6 1865 if (size_only)
21666f1a 1866 type = sha1_object_info(s->sha1, &s->size);
6973dcae 1867 else {
21666f1a 1868 s->data = read_sha1_file(s->sha1, &type, &s->size);
6973dcae
JH
1869 s->should_free = 1;
1870 }
1871 }
1872 return 0;
1873}
1874
8ae92e63 1875void diff_free_filespec_blob(struct diff_filespec *s)
6973dcae
JH
1876{
1877 if (s->should_free)
1878 free(s->data);
1879 else if (s->should_munmap)
1880 munmap(s->data, s->size);
fc3abdf5
JH
1881
1882 if (s->should_free || s->should_munmap) {
1883 s->should_free = s->should_munmap = 0;
1884 s->data = NULL;
1885 }
eede7b7d
JK
1886}
1887
1888void diff_free_filespec_data(struct diff_filespec *s)
1889{
8ae92e63 1890 diff_free_filespec_blob(s);
6973dcae
JH
1891 free(s->cnt_data);
1892 s->cnt_data = NULL;
1893}
1894
1895static void prep_temp_blob(struct diff_tempfile *temp,
1896 void *blob,
1897 unsigned long size,
1898 const unsigned char *sha1,
1899 int mode)
1900{
1901 int fd;
1902
1472966c 1903 fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
6973dcae 1904 if (fd < 0)
e7a7be88 1905 die("unable to create temp-file: %s", strerror(errno));
93822c22 1906 if (write_in_full(fd, blob, size) != size)
6973dcae
JH
1907 die("unable to write temp-file");
1908 close(fd);
1909 temp->name = temp->tmp_path;
1910 strcpy(temp->hex, sha1_to_hex(sha1));
1911 temp->hex[40] = 0;
1912 sprintf(temp->mode, "%06o", mode);
1913}
1914
1915static void prepare_temp_file(const char *name,
1916 struct diff_tempfile *temp,
1917 struct diff_filespec *one)
1918{
1919 if (!DIFF_FILE_VALID(one)) {
1920 not_a_valid_file:
1921 /* A '-' entry produces this for file-2, and
1922 * a '+' entry produces this for file-1.
1923 */
1924 temp->name = "/dev/null";
1925 strcpy(temp->hex, ".");
1926 strcpy(temp->mode, ".");
1927 return;
1928 }
1929
1930 if (!one->sha1_valid ||
1510fea7 1931 reuse_worktree_file(name, one->sha1, 1)) {
6973dcae
JH
1932 struct stat st;
1933 if (lstat(name, &st) < 0) {
1934 if (errno == ENOENT)
1935 goto not_a_valid_file;
1936 die("stat(%s): %s", name, strerror(errno));
1937 }
1938 if (S_ISLNK(st.st_mode)) {
1939 int ret;
1940 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
dc49cd76 1941 size_t sz = xsize_t(st.st_size);
6973dcae
JH
1942 if (sizeof(buf) <= st.st_size)
1943 die("symlink too long: %s", name);
dc49cd76 1944 ret = readlink(name, buf, sz);
6973dcae
JH
1945 if (ret < 0)
1946 die("readlink(%s)", name);
dc49cd76 1947 prep_temp_blob(temp, buf, sz,
6973dcae
JH
1948 (one->sha1_valid ?
1949 one->sha1 : null_sha1),
1950 (one->sha1_valid ?
1951 one->mode : S_IFLNK));
1952 }
1953 else {
1954 /* we can borrow from the file in the work tree */
1955 temp->name = name;
1956 if (!one->sha1_valid)
1957 strcpy(temp->hex, sha1_to_hex(null_sha1));
1958 else
1959 strcpy(temp->hex, sha1_to_hex(one->sha1));
1960 /* Even though we may sometimes borrow the
1961 * contents from the work tree, we always want
1962 * one->mode. mode is trustworthy even when
1963 * !(one->sha1_valid), as long as
1964 * DIFF_FILE_VALID(one).
1965 */
1966 sprintf(temp->mode, "%06o", one->mode);
1967 }
1968 return;
1969 }
1970 else {
1971 if (diff_populate_filespec(one, 0))
1972 die("cannot read data blob for %s", one->path);
1973 prep_temp_blob(temp, one->data, one->size,
1974 one->sha1, one->mode);
1975 }
1976}
1977
1978static void remove_tempfile(void)
1979{
1980 int i;
1981
1982 for (i = 0; i < 2; i++)
1983 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1984 unlink(diff_temp[i].name);
1985 diff_temp[i].name = NULL;
1986 }
1987}
1988
1989static void remove_tempfile_on_signal(int signo)
1990{
1991 remove_tempfile();
1992 signal(SIGINT, SIG_DFL);
1993 raise(signo);
1994}
1995
6973dcae
JH
1996/* An external diff command takes:
1997 *
1998 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1999 * infile2 infile2-sha1 infile2-mode [ rename-to ]
2000 *
2001 */
2002static void run_external_diff(const char *pgm,
2003 const char *name,
2004 const char *other,
2005 struct diff_filespec *one,
2006 struct diff_filespec *two,
2007 const char *xfrm_msg,
2008 int complete_rewrite)
2009{
2010 const char *spawn_arg[10];
2011 struct diff_tempfile *temp = diff_temp;
2012 int retval;
2013 static int atexit_asked = 0;
2014 const char *othername;
2015 const char **arg = &spawn_arg[0];
2016
2017 othername = (other? other : name);
2018 if (one && two) {
2019 prepare_temp_file(name, &temp[0], one);
2020 prepare_temp_file(othername, &temp[1], two);
2021 if (! atexit_asked &&
2022 (temp[0].name == temp[0].tmp_path ||
2023 temp[1].name == temp[1].tmp_path)) {
2024 atexit_asked = 1;
2025 atexit(remove_tempfile);
2026 }
2027 signal(SIGINT, remove_tempfile_on_signal);
2028 }
2029
2030 if (one && two) {
2031 *arg++ = pgm;
2032 *arg++ = name;
2033 *arg++ = temp[0].name;
2034 *arg++ = temp[0].hex;
2035 *arg++ = temp[0].mode;
2036 *arg++ = temp[1].name;
2037 *arg++ = temp[1].hex;
2038 *arg++ = temp[1].mode;
2039 if (other) {
2040 *arg++ = other;
2041 *arg++ = xfrm_msg;
2042 }
2043 } else {
2044 *arg++ = pgm;
2045 *arg++ = name;
2046 }
2047 *arg = NULL;
d5535ec7
JS
2048 fflush(NULL);
2049 retval = run_command_v_opt(spawn_arg, 0);
6973dcae
JH
2050 remove_tempfile();
2051 if (retval) {
2052 fprintf(stderr, "external diff died, stopping at %s.\n", name);
2053 exit(1);
2054 }
2055}
2056
f1af60bd
JH
2057static const char *external_diff_attr(const char *name)
2058{
2059 struct git_attr_check attr_diff_check;
2060
cd676a51
JH
2061 if (!name)
2062 return NULL;
2063
f1af60bd
JH
2064 setup_diff_attr_check(&attr_diff_check);
2065 if (!git_checkattr(name, 1, &attr_diff_check)) {
2066 const char *value = attr_diff_check.value;
2067 if (!ATTR_TRUE(value) &&
2068 !ATTR_FALSE(value) &&
2069 !ATTR_UNSET(value)) {
2070 struct ll_diff_driver *drv;
2071
f1af60bd
JH
2072 for (drv = user_diff; drv; drv = drv->next)
2073 if (!strcmp(drv->name, value))
2074 return drv->cmd;
2075 }
2076 }
2077 return NULL;
2078}
2079
6973dcae
JH
2080static void run_diff_cmd(const char *pgm,
2081 const char *name,
2082 const char *other,
cd676a51 2083 const char *attr_path,
6973dcae
JH
2084 struct diff_filespec *one,
2085 struct diff_filespec *two,
2086 const char *xfrm_msg,
051308f6 2087 struct diff_options *o,
6973dcae
JH
2088 int complete_rewrite)
2089{
8f67f8ae 2090 if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
f1af60bd
JH
2091 pgm = NULL;
2092 else {
cd676a51 2093 const char *cmd = external_diff_attr(attr_path);
f1af60bd
JH
2094 if (cmd)
2095 pgm = cmd;
2096 }
2097
6973dcae
JH
2098 if (pgm) {
2099 run_external_diff(pgm, name, other, one, two, xfrm_msg,
2100 complete_rewrite);
2101 return;
2102 }
2103 if (one && two)
2104 builtin_diff(name, other ? other : name,
051308f6 2105 one, two, xfrm_msg, o, complete_rewrite);
6973dcae 2106 else
c0c77734 2107 fprintf(o->file, "* Unmerged path %s\n", name);
6973dcae
JH
2108}
2109
2110static void diff_fill_sha1_info(struct diff_filespec *one)
2111{
2112 if (DIFF_FILE_VALID(one)) {
2113 if (!one->sha1_valid) {
2114 struct stat st;
5332b2af
JS
2115 if (!strcmp(one->path, "-")) {
2116 hashcpy(one->sha1, null_sha1);
2117 return;
2118 }
6973dcae
JH
2119 if (lstat(one->path, &st) < 0)
2120 die("stat %s", one->path);
2121 if (index_path(one->sha1, one->path, &st, 0))
2122 die("cannot hash %s\n", one->path);
2123 }
2124 }
2125 else
e702496e 2126 hashclr(one->sha1);
6973dcae
JH
2127}
2128
125b7630
RS
2129static int similarity_index(struct diff_filepair *p)
2130{
2131 return p->score * 100 / MAX_SCORE;
2132}
2133
cd676a51
JH
2134static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
2135{
2136 /* Strip the prefix but do not molest /dev/null and absolute paths */
2137 if (*namep && **namep != '/')
2138 *namep += prefix_length;
2139 if (*otherp && **otherp != '/')
2140 *otherp += prefix_length;
2141}
2142
6973dcae
JH
2143static void run_diff(struct diff_filepair *p, struct diff_options *o)
2144{
2145 const char *pgm = external_diff();
663af342
PH
2146 struct strbuf msg;
2147 char *xfrm_msg;
2148 struct diff_filespec *one = p->one;
2149 struct diff_filespec *two = p->two;
6973dcae
JH
2150 const char *name;
2151 const char *other;
cd676a51 2152 const char *attr_path;
6973dcae 2153 int complete_rewrite = 0;
663af342 2154
cd676a51
JH
2155 name = p->one->path;
2156 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2157 attr_path = name;
2158 if (o->prefix_length)
2159 strip_prefix(o->prefix_length, &name, &other);
6973dcae
JH
2160
2161 if (DIFF_PAIR_UNMERGED(p)) {
cd676a51
JH
2162 run_diff_cmd(pgm, name, NULL, attr_path,
2163 NULL, NULL, NULL, o, 0);
6973dcae
JH
2164 return;
2165 }
2166
6973dcae
JH
2167 diff_fill_sha1_info(one);
2168 diff_fill_sha1_info(two);
2169
663af342 2170 strbuf_init(&msg, PATH_MAX * 2 + 300);
6973dcae
JH
2171 switch (p->status) {
2172 case DIFF_STATUS_COPIED:
663af342
PH
2173 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2174 strbuf_addstr(&msg, "\ncopy from ");
2175 quote_c_style(name, &msg, NULL, 0);
2176 strbuf_addstr(&msg, "\ncopy to ");
2177 quote_c_style(other, &msg, NULL, 0);
2178 strbuf_addch(&msg, '\n');
6973dcae
JH
2179 break;
2180 case DIFF_STATUS_RENAMED:
663af342
PH
2181 strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
2182 strbuf_addstr(&msg, "\nrename from ");
2183 quote_c_style(name, &msg, NULL, 0);
2184 strbuf_addstr(&msg, "\nrename to ");
2185 quote_c_style(other, &msg, NULL, 0);
2186 strbuf_addch(&msg, '\n');
6973dcae
JH
2187 break;
2188 case DIFF_STATUS_MODIFIED:
2189 if (p->score) {
663af342 2190 strbuf_addf(&msg, "dissimilarity index %d%%\n",
125b7630 2191 similarity_index(p));
6973dcae
JH
2192 complete_rewrite = 1;
2193 break;
2194 }
2195 /* fallthru */
2196 default:
2197 /* nothing */
2198 ;
2199 }
2200
a89fccd2 2201 if (hashcmp(one->sha1, two->sha1)) {
8f67f8ae 2202 int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
6973dcae 2203
8f67f8ae 2204 if (DIFF_OPT_TST(o, BINARY)) {
82793c55 2205 mmfile_t mf;
29a3eefd
JH
2206 if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
2207 (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
82793c55
JH
2208 abbrev = 40;
2209 }
663af342 2210 strbuf_addf(&msg, "index %.*s..%.*s",
dcb3450f
LT
2211 abbrev, sha1_to_hex(one->sha1),
2212 abbrev, sha1_to_hex(two->sha1));
6973dcae 2213 if (one->mode == two->mode)
663af342
PH
2214 strbuf_addf(&msg, " %06o", one->mode);
2215 strbuf_addch(&msg, '\n');
6973dcae
JH
2216 }
2217
663af342
PH
2218 if (msg.len)
2219 strbuf_setlen(&msg, msg.len - 1);
2220 xfrm_msg = msg.len ? msg.buf : NULL;
6973dcae
JH
2221
2222 if (!pgm &&
2223 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
2224 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
2225 /* a filepair that changes between file and symlink
2226 * needs to be split into deletion and creation.
2227 */
2228 struct diff_filespec *null = alloc_filespec(two->path);
cd676a51
JH
2229 run_diff_cmd(NULL, name, other, attr_path,
2230 one, null, xfrm_msg, o, 0);
6973dcae
JH
2231 free(null);
2232 null = alloc_filespec(one->path);
cd676a51
JH
2233 run_diff_cmd(NULL, name, other, attr_path,
2234 null, two, xfrm_msg, o, 0);
6973dcae
JH
2235 free(null);
2236 }
2237 else
cd676a51
JH
2238 run_diff_cmd(pgm, name, other, attr_path,
2239 one, two, xfrm_msg, o, complete_rewrite);
6973dcae 2240
663af342 2241 strbuf_release(&msg);
6973dcae
JH
2242}
2243
2244static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
2245 struct diffstat_t *diffstat)
2246{
2247 const char *name;
2248 const char *other;
710158e3 2249 int complete_rewrite = 0;
6973dcae
JH
2250
2251 if (DIFF_PAIR_UNMERGED(p)) {
2252 /* unmerged */
0d21efa5 2253 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
6973dcae
JH
2254 return;
2255 }
2256
2257 name = p->one->path;
2258 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
2259
cd676a51
JH
2260 if (o->prefix_length)
2261 strip_prefix(o->prefix_length, &name, &other);
2262
6973dcae
JH
2263 diff_fill_sha1_info(p->one);
2264 diff_fill_sha1_info(p->two);
2265
710158e3
JH
2266 if (p->status == DIFF_STATUS_MODIFIED && p->score)
2267 complete_rewrite = 1;
0d21efa5 2268 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
6973dcae
JH
2269}
2270
88246898
JS
2271static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
2272{
2273 const char *name;
2274 const char *other;
cd676a51 2275 const char *attr_path;
88246898
JS
2276
2277 if (DIFF_PAIR_UNMERGED(p)) {
2278 /* unmerged */
2279 return;
2280 }
2281
2282 name = p->one->path;
2283 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
cd676a51
JH
2284 attr_path = other ? other : name;
2285
2286 if (o->prefix_length)
2287 strip_prefix(o->prefix_length, &name, &other);
88246898
JS
2288
2289 diff_fill_sha1_info(p->one);
2290 diff_fill_sha1_info(p->two);
2291
cd676a51 2292 builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
88246898
JS
2293}
2294
6973dcae
JH
2295void diff_setup(struct diff_options *options)
2296{
2297 memset(options, 0, sizeof(*options));
c0c77734
DB
2298
2299 options->file = stdout;
2300
6973dcae
JH
2301 options->line_termination = '\n';
2302 options->break_opt = -1;
2303 options->rename_limit = -1;
7df7c019 2304 options->dirstat_percent = 3;
ee1e5412 2305 options->context = 3;
6973dcae
JH
2306
2307 options->change = diff_change;
2308 options->add_remove = diff_addremove;
6b2f2d98 2309 if (diff_use_color_default > 0)
8f67f8ae
PH
2310 DIFF_OPT_SET(options, COLOR_DIFF);
2311 else
2312 DIFF_OPT_CLR(options, COLOR_DIFF);
b68ea12e 2313 options->detect_rename = diff_detect_rename_default;
eab9a40b
JS
2314
2315 options->a_prefix = "a/";
2316 options->b_prefix = "b/";
6973dcae
JH
2317}
2318
2319int diff_setup_done(struct diff_options *options)
2320{
d7de00f7
TH
2321 int count = 0;
2322
2323 if (options->output_format & DIFF_FORMAT_NAME)
2324 count++;
2325 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
2326 count++;
2327 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
2328 count++;
2329 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
2330 count++;
2331 if (count > 1)
2332 die("--name-only, --name-status, --check and -s are mutually exclusive");
2333
8f67f8ae 2334 if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
03b9d560
JH
2335 options->detect_rename = DIFF_DETECT_COPY;
2336
cd676a51
JH
2337 if (!DIFF_OPT_TST(options, RELATIVE_NAME))
2338 options->prefix = NULL;
2339 if (options->prefix)
2340 options->prefix_length = strlen(options->prefix);
2341 else
2342 options->prefix_length = 0;
2343
c6744349
TH
2344 if (options->output_format & (DIFF_FORMAT_NAME |
2345 DIFF_FORMAT_NAME_STATUS |
2346 DIFF_FORMAT_CHECKDIFF |
2347 DIFF_FORMAT_NO_OUTPUT))
2348 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 2349 DIFF_FORMAT_NUMSTAT |
c6744349 2350 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2351 DIFF_FORMAT_SHORTSTAT |
7df7c019 2352 DIFF_FORMAT_DIRSTAT |
c6744349
TH
2353 DIFF_FORMAT_SUMMARY |
2354 DIFF_FORMAT_PATCH);
2355
6973dcae
JH
2356 /*
2357 * These cases always need recursive; we do not drop caller-supplied
2358 * recursive bits for other formats here.
2359 */
c6744349 2360 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 2361 DIFF_FORMAT_NUMSTAT |
c6744349 2362 DIFF_FORMAT_DIFFSTAT |
ebd124c6 2363 DIFF_FORMAT_SHORTSTAT |
7df7c019 2364 DIFF_FORMAT_DIRSTAT |
d7014dc0 2365 DIFF_FORMAT_SUMMARY |
c6744349 2366 DIFF_FORMAT_CHECKDIFF))
8f67f8ae 2367 DIFF_OPT_SET(options, RECURSIVE);
5e363541 2368 /*
3969cf7d 2369 * Also pickaxe would not work very well if you do not say recursive
5e363541 2370 */
3969cf7d 2371 if (options->pickaxe)
8f67f8ae 2372 DIFF_OPT_SET(options, RECURSIVE);
5e363541 2373
6973dcae
JH
2374 if (options->detect_rename && options->rename_limit < 0)
2375 options->rename_limit = diff_rename_limit_default;
2376 if (options->setup & DIFF_SETUP_USE_CACHE) {
2377 if (!active_cache)
2378 /* read-cache does not die even when it fails
2379 * so it is safe for us to do this here. Also
2380 * it does not smudge active_cache or active_nr
2381 * when it fails, so we do not have to worry about
2382 * cleaning it up ourselves either.
2383 */
2384 read_cache();
2385 }
6973dcae
JH
2386 if (options->abbrev <= 0 || 40 < options->abbrev)
2387 options->abbrev = 40; /* full */
2388
68aacb2f
JH
2389 /*
2390 * It does not make sense to show the first hit we happened
2391 * to have found. It does not make sense not to return with
2392 * exit code in such a case either.
2393 */
8f67f8ae 2394 if (DIFF_OPT_TST(options, QUIET)) {
68aacb2f 2395 options->output_format = DIFF_FORMAT_NO_OUTPUT;
8f67f8ae 2396 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f
JH
2397 }
2398
2399 /*
2400 * If we postprocess in diffcore, we cannot simply return
2401 * upon the first hit. We need to run diff as usual.
2402 */
2403 if (options->pickaxe || options->filter)
8f67f8ae 2404 DIFF_OPT_CLR(options, QUIET);
68aacb2f 2405
6973dcae
JH
2406 return 0;
2407}
2408
d2543b8e 2409static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
ee1e5412
LT
2410{
2411 char c, *eq;
2412 int len;
2413
2414 if (*arg != '-')
2415 return 0;
2416 c = *++arg;
2417 if (!c)
2418 return 0;
2419 if (c == arg_short) {
2420 c = *++arg;
2421 if (!c)
2422 return 1;
2423 if (val && isdigit(c)) {
2424 char *end;
2425 int n = strtoul(arg, &end, 10);
2426 if (*end)
2427 return 0;
2428 *val = n;
2429 return 1;
2430 }
2431 return 0;
2432 }
2433 if (c != '-')
2434 return 0;
2435 arg++;
2436 eq = strchr(arg, '=');
2437 if (eq)
2438 len = eq - arg;
2439 else
2440 len = strlen(arg);
2441 if (!len || strncmp(arg, arg_long, len))
2442 return 0;
2443 if (eq) {
2444 int n;
2445 char *end;
2446 if (!isdigit(*++eq))
2447 return 0;
2448 n = strtoul(eq, &end, 10);
2449 if (*end)
2450 return 0;
2451 *val = n;
2452 }
2453 return 1;
2454}
2455
16befb8b
JH
2456static int diff_scoreopt_parse(const char *opt);
2457
6973dcae
JH
2458int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2459{
2460 const char *arg = av[0];
d054680c
PH
2461
2462 /* Output format options */
6973dcae 2463 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
c6744349 2464 options->output_format |= DIFF_FORMAT_PATCH;
ee1e5412 2465 else if (opt_arg(arg, 'U', "unified", &options->context))
c6744349 2466 options->output_format |= DIFF_FORMAT_PATCH;
a610786f
TH
2467 else if (!strcmp(arg, "--raw"))
2468 options->output_format |= DIFF_FORMAT_RAW;
8f67f8ae 2469 else if (!strcmp(arg, "--patch-with-raw"))
c6744349 2470 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
8f67f8ae 2471 else if (!strcmp(arg, "--numstat"))
74e2abe5 2472 options->output_format |= DIFF_FORMAT_NUMSTAT;
8f67f8ae 2473 else if (!strcmp(arg, "--shortstat"))
ebd124c6 2474 options->output_format |= DIFF_FORMAT_SHORTSTAT;
7df7c019
LT
2475 else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
2476 options->output_format |= DIFF_FORMAT_DIRSTAT;
2477 else if (!strcmp(arg, "--cumulative"))
2478 options->output_format |= DIFF_FORMAT_CUMULATIVE;
d054680c
PH
2479 else if (!strcmp(arg, "--check"))
2480 options->output_format |= DIFF_FORMAT_CHECKDIFF;
2481 else if (!strcmp(arg, "--summary"))
2482 options->output_format |= DIFF_FORMAT_SUMMARY;
2483 else if (!strcmp(arg, "--patch-with-stat"))
2484 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
2485 else if (!strcmp(arg, "--name-only"))
2486 options->output_format |= DIFF_FORMAT_NAME;
2487 else if (!strcmp(arg, "--name-status"))
2488 options->output_format |= DIFF_FORMAT_NAME_STATUS;
2489 else if (!strcmp(arg, "-s"))
2490 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
cc44c765 2491 else if (!prefixcmp(arg, "--stat")) {
5c5b2ea9
LT
2492 char *end;
2493 int width = options->stat_width;
2494 int name_width = options->stat_name_width;
2495 arg += 6;
2496 end = (char *)arg;
2497
2498 switch (*arg) {
2499 case '-':
cc44c765 2500 if (!prefixcmp(arg, "-width="))
5c5b2ea9 2501 width = strtoul(arg + 7, &end, 10);
cc44c765 2502 else if (!prefixcmp(arg, "-name-width="))
5c5b2ea9
LT
2503 name_width = strtoul(arg + 12, &end, 10);
2504 break;
2505 case '=':
2506 width = strtoul(arg+1, &end, 10);
2507 if (*end == ',')
2508 name_width = strtoul(end+1, &end, 10);
2509 }
2510
2511 /* Important! This checks all the error cases! */
2512 if (*end)
2513 return 0;
c6744349 2514 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5c5b2ea9
LT
2515 options->stat_name_width = name_width;
2516 options->stat_width = width;
a2540023 2517 }
d054680c
PH
2518
2519 /* renames options */
cc44c765 2520 else if (!prefixcmp(arg, "-B")) {
8f67f8ae 2521 if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2522 return -1;
2523 }
cc44c765 2524 else if (!prefixcmp(arg, "-M")) {
8f67f8ae 2525 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2526 return -1;
2527 options->detect_rename = DIFF_DETECT_RENAME;
2528 }
cc44c765 2529 else if (!prefixcmp(arg, "-C")) {
ca6c0970 2530 if (options->detect_rename == DIFF_DETECT_COPY)
8f67f8ae
PH
2531 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
2532 if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
6973dcae
JH
2533 return -1;
2534 options->detect_rename = DIFF_DETECT_COPY;
2535 }
d054680c
PH
2536 else if (!strcmp(arg, "--no-renames"))
2537 options->detect_rename = 0;
cd676a51
JH
2538 else if (!strcmp(arg, "--relative"))
2539 DIFF_OPT_SET(options, RELATIVE_NAME);
c0cb4a06
JH
2540 else if (!prefixcmp(arg, "--relative=")) {
2541 DIFF_OPT_SET(options, RELATIVE_NAME);
2542 options->prefix = arg + 11;
2543 }
d054680c
PH
2544
2545 /* xdiff options */
2546 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2547 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2548 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2549 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
2550 else if (!strcmp(arg, "--ignore-space-at-eol"))
2551 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
2552
2553 /* flags options */
2554 else if (!strcmp(arg, "--binary")) {
2555 options->output_format |= DIFF_FORMAT_PATCH;
2556 DIFF_OPT_SET(options, BINARY);
2557 }
2558 else if (!strcmp(arg, "--full-index"))
2559 DIFF_OPT_SET(options, FULL_INDEX);
2560 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
2561 DIFF_OPT_SET(options, TEXT);
2562 else if (!strcmp(arg, "-R"))
2563 DIFF_OPT_SET(options, REVERSE_DIFF);
6973dcae 2564 else if (!strcmp(arg, "--find-copies-harder"))
8f67f8ae 2565 DIFF_OPT_SET(options, FIND_COPIES_HARDER);
750f7b66 2566 else if (!strcmp(arg, "--follow"))
8f67f8ae 2567 DIFF_OPT_SET(options, FOLLOW_RENAMES);
cd112cef 2568 else if (!strcmp(arg, "--color"))
8f67f8ae 2569 DIFF_OPT_SET(options, COLOR_DIFF);
fef88bb0 2570 else if (!strcmp(arg, "--no-color"))
8f67f8ae 2571 DIFF_OPT_CLR(options, COLOR_DIFF);
f59a59e2 2572 else if (!strcmp(arg, "--color-words"))
8f67f8ae 2573 options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
41bbf9d5 2574 else if (!strcmp(arg, "--exit-code"))
8f67f8ae 2575 DIFF_OPT_SET(options, EXIT_WITH_STATUS);
68aacb2f 2576 else if (!strcmp(arg, "--quiet"))
8f67f8ae 2577 DIFF_OPT_SET(options, QUIET);
72909bef 2578 else if (!strcmp(arg, "--ext-diff"))
8f67f8ae 2579 DIFF_OPT_SET(options, ALLOW_EXTERNAL);
72909bef 2580 else if (!strcmp(arg, "--no-ext-diff"))
8f67f8ae 2581 DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
50fd9bd8
JS
2582 else if (!strcmp(arg, "--ignore-submodules"))
2583 DIFF_OPT_SET(options, IGNORE_SUBMODULES);
d054680c
PH
2584
2585 /* misc options */
2586 else if (!strcmp(arg, "-z"))
2587 options->line_termination = 0;
2588 else if (!prefixcmp(arg, "-l"))
2589 options->rename_limit = strtoul(arg+2, NULL, 10);
2590 else if (!prefixcmp(arg, "-S"))
2591 options->pickaxe = arg + 2;
2592 else if (!strcmp(arg, "--pickaxe-all"))
2593 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2594 else if (!strcmp(arg, "--pickaxe-regex"))
2595 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
2596 else if (!prefixcmp(arg, "-O"))
2597 options->orderfile = arg + 2;
2598 else if (!prefixcmp(arg, "--diff-filter="))
2599 options->filter = arg + 14;
2600 else if (!strcmp(arg, "--abbrev"))
2601 options->abbrev = DEFAULT_ABBREV;
2602 else if (!prefixcmp(arg, "--abbrev=")) {
2603 options->abbrev = strtoul(arg + 9, NULL, 10);
2604 if (options->abbrev < MINIMUM_ABBREV)
2605 options->abbrev = MINIMUM_ABBREV;
2606 else if (40 < options->abbrev)
2607 options->abbrev = 40;
2608 }
eab9a40b
JS
2609 else if (!prefixcmp(arg, "--src-prefix="))
2610 options->a_prefix = arg + 13;
2611 else if (!prefixcmp(arg, "--dst-prefix="))
2612 options->b_prefix = arg + 13;
2613 else if (!strcmp(arg, "--no-prefix"))
2614 options->a_prefix = options->b_prefix = "";
c0c77734
DB
2615 else if (!prefixcmp(arg, "--output=")) {
2616 options->file = fopen(arg + strlen("--output="), "w");
2617 options->close_file = 1;
2618 } else
6973dcae
JH
2619 return 0;
2620 return 1;
2621}
2622
2623static int parse_num(const char **cp_p)
2624{
2625 unsigned long num, scale;
2626 int ch, dot;
2627 const char *cp = *cp_p;
2628
2629 num = 0;
2630 scale = 1;
2631 dot = 0;
2632 for(;;) {
2633 ch = *cp;
2634 if ( !dot && ch == '.' ) {
2635 scale = 1;
2636 dot = 1;
2637 } else if ( ch == '%' ) {
2638 scale = dot ? scale*100 : 100;
2639 cp++; /* % is always at the end */
2640 break;
2641 } else if ( ch >= '0' && ch <= '9' ) {
2642 if ( scale < 100000 ) {
2643 scale *= 10;
2644 num = (num*10) + (ch-'0');
2645 }
2646 } else {
2647 break;
2648 }
2649 cp++;
2650 }
2651 *cp_p = cp;
2652
2653 /* user says num divided by scale and we say internally that
2654 * is MAX_SCORE * num / scale.
2655 */
dc49cd76 2656 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
6973dcae
JH
2657}
2658
16befb8b 2659static int diff_scoreopt_parse(const char *opt)
6973dcae
JH
2660{
2661 int opt1, opt2, cmd;
2662
2663 if (*opt++ != '-')
2664 return -1;
2665 cmd = *opt++;
2666 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2667 return -1; /* that is not a -M, -C nor -B option */
2668
2669 opt1 = parse_num(&opt);
2670 if (cmd != 'B')
2671 opt2 = 0;
2672 else {
2673 if (*opt == 0)
2674 opt2 = 0;
2675 else if (*opt != '/')
2676 return -1; /* we expect -B80/99 or -B80 */
2677 else {
2678 opt++;
2679 opt2 = parse_num(&opt);
2680 }
2681 }
2682 if (*opt != 0)
2683 return -1;
2684 return opt1 | (opt2 << 16);
2685}
2686
2687struct diff_queue_struct diff_queued_diff;
2688
2689void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2690{
2691 if (queue->alloc <= queue->nr) {
2692 queue->alloc = alloc_nr(queue->alloc);
2693 queue->queue = xrealloc(queue->queue,
2694 sizeof(dp) * queue->alloc);
2695 }
2696 queue->queue[queue->nr++] = dp;
2697}
2698
2699struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2700 struct diff_filespec *one,
2701 struct diff_filespec *two)
2702{
ef677686 2703 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
6973dcae
JH
2704 dp->one = one;
2705 dp->two = two;
6973dcae
JH
2706 if (queue)
2707 diff_q(queue, dp);
2708 return dp;
2709}
2710
2711void diff_free_filepair(struct diff_filepair *p)
2712{
9fb88419
LT
2713 free_filespec(p->one);
2714 free_filespec(p->two);
6973dcae
JH
2715 free(p);
2716}
2717
2718/* This is different from find_unique_abbrev() in that
2719 * it stuffs the result with dots for alignment.
2720 */
2721const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2722{
2723 int abblen;
2724 const char *abbrev;
2725 if (len == 40)
2726 return sha1_to_hex(sha1);
2727
2728 abbrev = find_unique_abbrev(sha1, len);
6973dcae
JH
2729 abblen = strlen(abbrev);
2730 if (abblen < 37) {
2731 static char hex[41];
2732 if (len < abblen && abblen <= len + 2)
2733 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2734 else
2735 sprintf(hex, "%s...", abbrev);
2736 return hex;
2737 }
2738 return sha1_to_hex(sha1);
2739}
2740
663af342 2741static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
6973dcae 2742{
663af342
PH
2743 int line_termination = opt->line_termination;
2744 int inter_name_termination = line_termination ? '\t' : '\0';
6973dcae 2745
663af342 2746 if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
c0c77734
DB
2747 fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
2748 diff_unique_abbrev(p->one->sha1, opt->abbrev));
2749 fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
6973dcae 2750 }
663af342 2751 if (p->score) {
c0c77734
DB
2752 fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
2753 inter_name_termination);
663af342 2754 } else {
c0c77734 2755 fprintf(opt->file, "%c%c", p->status, inter_name_termination);
6973dcae 2756 }
6973dcae 2757
cd676a51
JH
2758 if (p->status == DIFF_STATUS_COPIED ||
2759 p->status == DIFF_STATUS_RENAMED) {
2760 const char *name_a, *name_b;
2761 name_a = p->one->path;
2762 name_b = p->two->path;
2763 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734
DB
2764 write_name_quoted(name_a, opt->file, inter_name_termination);
2765 write_name_quoted(name_b, opt->file, line_termination);
663af342 2766 } else {
cd676a51
JH
2767 const char *name_a, *name_b;
2768 name_a = p->one->mode ? p->one->path : p->two->path;
2769 name_b = NULL;
2770 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734 2771 write_name_quoted(name_a, opt->file, line_termination);
663af342 2772 }
6973dcae
JH
2773}
2774
2775int diff_unmodified_pair(struct diff_filepair *p)
2776{
2777 /* This function is written stricter than necessary to support
2778 * the currently implemented transformers, but the idea is to
2779 * let transformers to produce diff_filepairs any way they want,
2780 * and filter and clean them up here before producing the output.
2781 */
663af342 2782 struct diff_filespec *one = p->one, *two = p->two;
6973dcae
JH
2783
2784 if (DIFF_PAIR_UNMERGED(p))
2785 return 0; /* unmerged is interesting */
2786
6973dcae
JH
2787 /* deletion, addition, mode or type change
2788 * and rename are all interesting.
2789 */
2790 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2791 DIFF_PAIR_MODE_CHANGED(p) ||
2792 strcmp(one->path, two->path))
2793 return 0;
2794
2795 /* both are valid and point at the same path. that is, we are
2796 * dealing with a change.
2797 */
2798 if (one->sha1_valid && two->sha1_valid &&
a89fccd2 2799 !hashcmp(one->sha1, two->sha1))
6973dcae
JH
2800 return 1; /* no change */
2801 if (!one->sha1_valid && !two->sha1_valid)
2802 return 1; /* both look at the same file on the filesystem. */
2803 return 0;
2804}
2805
2806static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2807{
2808 if (diff_unmodified_pair(p))
2809 return;
2810
2811 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2812 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2813 return; /* no tree diffs in patch format */
2814
2815 run_diff(p, o);
2816}
2817
2818static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2819 struct diffstat_t *diffstat)
2820{
2821 if (diff_unmodified_pair(p))
2822 return;
2823
2824 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2825 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2826 return; /* no tree diffs in patch format */
2827
2828 run_diffstat(p, o, diffstat);
2829}
2830
88246898
JS
2831static void diff_flush_checkdiff(struct diff_filepair *p,
2832 struct diff_options *o)
2833{
2834 if (diff_unmodified_pair(p))
2835 return;
2836
2837 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2838 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2839 return; /* no tree diffs in patch format */
2840
2841 run_checkdiff(p, o);
2842}
2843
6973dcae
JH
2844int diff_queue_is_empty(void)
2845{
2846 struct diff_queue_struct *q = &diff_queued_diff;
2847 int i;
2848 for (i = 0; i < q->nr; i++)
2849 if (!diff_unmodified_pair(q->queue[i]))
2850 return 0;
2851 return 1;
2852}
2853
2854#if DIFF_DEBUG
2855void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2856{
2857 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2858 x, one ? one : "",
2859 s->path,
2860 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2861 s->mode,
2862 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2863 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2864 x, one ? one : "",
2865 s->size, s->xfrm_flags);
2866}
2867
2868void diff_debug_filepair(const struct diff_filepair *p, int i)
2869{
2870 diff_debug_filespec(p->one, i, "one");
2871 diff_debug_filespec(p->two, i, "two");
64479711 2872 fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
6973dcae 2873 p->score, p->status ? p->status : '?',
64479711 2874 p->one->rename_used, p->broken_pair);
6973dcae
JH
2875}
2876
2877void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2878{
2879 int i;
2880 if (msg)
2881 fprintf(stderr, "%s\n", msg);
2882 fprintf(stderr, "q->nr = %d\n", q->nr);
2883 for (i = 0; i < q->nr; i++) {
2884 struct diff_filepair *p = q->queue[i];
2885 diff_debug_filepair(p, i);
2886 }
2887}
2888#endif
2889
2890static void diff_resolve_rename_copy(void)
2891{
64479711
LT
2892 int i;
2893 struct diff_filepair *p;
6973dcae
JH
2894 struct diff_queue_struct *q = &diff_queued_diff;
2895
2896 diff_debug_queue("resolve-rename-copy", q);
2897
2898 for (i = 0; i < q->nr; i++) {
2899 p = q->queue[i];
2900 p->status = 0; /* undecided */
2901 if (DIFF_PAIR_UNMERGED(p))
2902 p->status = DIFF_STATUS_UNMERGED;
2903 else if (!DIFF_FILE_VALID(p->one))
2904 p->status = DIFF_STATUS_ADDED;
2905 else if (!DIFF_FILE_VALID(p->two))
2906 p->status = DIFF_STATUS_DELETED;
2907 else if (DIFF_PAIR_TYPE_CHANGED(p))
2908 p->status = DIFF_STATUS_TYPE_CHANGED;
2909
2910 /* from this point on, we are dealing with a pair
2911 * whose both sides are valid and of the same type, i.e.
2912 * either in-place edit or rename/copy edit.
2913 */
2914 else if (DIFF_PAIR_RENAME(p)) {
64479711
LT
2915 /*
2916 * A rename might have re-connected a broken
2917 * pair up, causing the pathnames to be the
2918 * same again. If so, that's not a rename at
2919 * all, just a modification..
2920 *
2921 * Otherwise, see if this source was used for
2922 * multiple renames, in which case we decrement
2923 * the count, and call it a copy.
6973dcae 2924 */
64479711
LT
2925 if (!strcmp(p->one->path, p->two->path))
2926 p->status = DIFF_STATUS_MODIFIED;
2927 else if (--p->one->rename_used > 0)
6973dcae 2928 p->status = DIFF_STATUS_COPIED;
64479711 2929 else
6973dcae
JH
2930 p->status = DIFF_STATUS_RENAMED;
2931 }
a89fccd2 2932 else if (hashcmp(p->one->sha1, p->two->sha1) ||
d516c2d1
JS
2933 p->one->mode != p->two->mode ||
2934 is_null_sha1(p->one->sha1))
6973dcae
JH
2935 p->status = DIFF_STATUS_MODIFIED;
2936 else {
2937 /* This is a "no-change" entry and should not
2938 * happen anymore, but prepare for broken callers.
2939 */
2940 error("feeding unmodified %s to diffcore",
2941 p->one->path);
2942 p->status = DIFF_STATUS_UNKNOWN;
2943 }
2944 }
2945 diff_debug_queue("resolve-rename-copy done", q);
2946}
2947
c6744349 2948static int check_pair_status(struct diff_filepair *p)
6973dcae 2949{
6973dcae
JH
2950 switch (p->status) {
2951 case DIFF_STATUS_UNKNOWN:
c6744349 2952 return 0;
6973dcae
JH
2953 case 0:
2954 die("internal error in diff-resolve-rename-copy");
6973dcae 2955 default:
c6744349 2956 return 1;
6973dcae
JH
2957 }
2958}
2959
c6744349
TH
2960static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2961{
2962 int fmt = opt->output_format;
2963
2964 if (fmt & DIFF_FORMAT_CHECKDIFF)
2965 diff_flush_checkdiff(p, opt);
2966 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2967 diff_flush_raw(p, opt);
cd676a51
JH
2968 else if (fmt & DIFF_FORMAT_NAME) {
2969 const char *name_a, *name_b;
2970 name_a = p->two->path;
2971 name_b = NULL;
2972 strip_prefix(opt->prefix_length, &name_a, &name_b);
c0c77734 2973 write_name_quoted(name_a, opt->file, opt->line_termination);
cd676a51 2974 }
c6744349
TH
2975}
2976
c0c77734 2977static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
4bbd261b
SE
2978{
2979 if (fs->mode)
c0c77734 2980 fprintf(file, " %s mode %06o ", newdelete, fs->mode);
4bbd261b 2981 else
c0c77734
DB
2982 fprintf(file, " %s ", newdelete);
2983 write_name_quoted(fs->path, file, '\n');
4bbd261b
SE
2984}
2985
2986
c0c77734 2987static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name)
4bbd261b
SE
2988{
2989 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
c0c77734 2990 fprintf(file, " mode change %06o => %06o%c", p->one->mode, p->two->mode,
663af342 2991 show_name ? ' ' : '\n');
0d26a64e 2992 if (show_name) {
c0c77734 2993 write_name_quoted(p->two->path, file, '\n');
0d26a64e 2994 }
4bbd261b
SE
2995 }
2996}
2997
c0c77734 2998static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p)
4bbd261b 2999{
b9f44164 3000 char *names = pprint_rename(p->one->path, p->two->path);
4bbd261b 3001
c0c77734 3002 fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
b9f44164 3003 free(names);
c0c77734 3004 show_mode_change(file, p, 0);
4bbd261b
SE
3005}
3006
c0c77734 3007static void diff_summary(FILE *file, struct diff_filepair *p)
4bbd261b
SE
3008{
3009 switch(p->status) {
3010 case DIFF_STATUS_DELETED:
c0c77734 3011 show_file_mode_name(file, "delete", p->one);
4bbd261b
SE
3012 break;
3013 case DIFF_STATUS_ADDED:
c0c77734 3014 show_file_mode_name(file, "create", p->two);
4bbd261b
SE
3015 break;
3016 case DIFF_STATUS_COPIED:
c0c77734 3017 show_rename_copy(file, "copy", p);
4bbd261b
SE
3018 break;
3019 case DIFF_STATUS_RENAMED:
c0c77734 3020 show_rename_copy(file, "rename", p);
4bbd261b
SE
3021 break;
3022 default:
3023 if (p->score) {
c0c77734
DB
3024 fputs(" rewrite ", file);
3025 write_name_quoted(p->two->path, file, ' ');
3026 fprintf(file, "(%d%%)\n", similarity_index(p));
663af342 3027 }
c0c77734 3028 show_mode_change(file, p, !p->score);
4bbd261b
SE
3029 break;
3030 }
3031}
3032
fcb3d0ad
JS
3033struct patch_id_t {
3034 struct xdiff_emit_state xm;
3035 SHA_CTX *ctx;
3036 int patchlen;
3037};
3038
3039static int remove_space(char *line, int len)
3040{
3041 int i;
663af342
PH
3042 char *dst = line;
3043 unsigned char c;
fcb3d0ad 3044
663af342
PH
3045 for (i = 0; i < len; i++)
3046 if (!isspace((c = line[i])))
3047 *dst++ = c;
fcb3d0ad 3048
663af342 3049 return dst - line;
fcb3d0ad
JS
3050}
3051
3052static void patch_id_consume(void *priv, char *line, unsigned long len)
3053{
3054 struct patch_id_t *data = priv;
3055 int new_len;
3056
3057 /* Ignore line numbers when computing the SHA1 of the patch */
cc44c765 3058 if (!prefixcmp(line, "@@ -"))
fcb3d0ad
JS
3059 return;
3060
3061 new_len = remove_space(line, len);
3062
3063 SHA1_Update(data->ctx, line, new_len);
3064 data->patchlen += new_len;
3065}
3066
3067/* returns 0 upon success, and writes result into sha1 */
3068static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
3069{
3070 struct diff_queue_struct *q = &diff_queued_diff;
3071 int i;
3072 SHA_CTX ctx;
3073 struct patch_id_t data;
3074 char buffer[PATH_MAX * 4 + 20];
3075
3076 SHA1_Init(&ctx);
3077 memset(&data, 0, sizeof(struct patch_id_t));
3078 data.ctx = &ctx;
3079 data.xm.consume = patch_id_consume;
3080
3081 for (i = 0; i < q->nr; i++) {
3082 xpparam_t xpp;
3083 xdemitconf_t xecfg;
3084 xdemitcb_t ecb;
3085 mmfile_t mf1, mf2;
3086 struct diff_filepair *p = q->queue[i];
3087 int len1, len2;
3088
30b25010 3089 memset(&xecfg, 0, sizeof(xecfg));
fcb3d0ad
JS
3090 if (p->status == 0)
3091 return error("internal diff status error");
3092 if (p->status == DIFF_STATUS_UNKNOWN)
3093 continue;
3094 if (diff_unmodified_pair(p))
3095 continue;
3096 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
3097 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
3098 continue;
3099 if (DIFF_PAIR_UNMERGED(p))
3100 continue;
3101
3102 diff_fill_sha1_info(p->one);
3103 diff_fill_sha1_info(p->two);
3104 if (fill_mmfile(&mf1, p->one) < 0 ||
3105 fill_mmfile(&mf2, p->two) < 0)
3106 return error("unable to read files to diff");
3107
fcb3d0ad
JS
3108 len1 = remove_space(p->one->path, strlen(p->one->path));
3109 len2 = remove_space(p->two->path, strlen(p->two->path));
3110 if (p->one->mode == 0)
3111 len1 = snprintf(buffer, sizeof(buffer),
3112 "diff--gita/%.*sb/%.*s"
3113 "newfilemode%06o"
3114 "---/dev/null"
3115 "+++b/%.*s",
3116 len1, p->one->path,
3117 len2, p->two->path,
3118 p->two->mode,
3119 len2, p->two->path);
3120 else if (p->two->mode == 0)
3121 len1 = snprintf(buffer, sizeof(buffer),
3122 "diff--gita/%.*sb/%.*s"
3123 "deletedfilemode%06o"
3124 "---a/%.*s"
3125 "+++/dev/null",
3126 len1, p->one->path,
3127 len2, p->two->path,
3128 p->one->mode,
3129 len1, p->one->path);
3130 else
3131 len1 = snprintf(buffer, sizeof(buffer),
3132 "diff--gita/%.*sb/%.*s"
3133 "---a/%.*s"
3134 "+++b/%.*s",
3135 len1, p->one->path,
3136 len2, p->two->path,
3137 len1, p->one->path,
3138 len2, p->two->path);
3139 SHA1_Update(&ctx, buffer, len1);
3140
3141 xpp.flags = XDF_NEED_MINIMAL;
3142 xecfg.ctxlen = 3;
9fdc3bb5 3143 xecfg.flags = XDL_EMIT_FUNCNAMES;
fcb3d0ad
JS
3144 ecb.outf = xdiff_outf;
3145 ecb.priv = &data;
c279d7e9 3146 xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
fcb3d0ad
JS
3147 }
3148
3149 SHA1_Final(sha1, &ctx);
3150 return 0;
3151}
3152
3153int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
3154{
3155 struct diff_queue_struct *q = &diff_queued_diff;
3156 int i;
3157 int result = diff_get_patch_id(options, sha1);
3158
3159 for (i = 0; i < q->nr; i++)
3160 diff_free_filepair(q->queue[i]);
3161
3162 free(q->queue);
3163 q->queue = NULL;
3164 q->nr = q->alloc = 0;
3165
3166 return result;
3167}
3168
946c3784 3169static int is_summary_empty(const struct diff_queue_struct *q)
6973dcae 3170{
6973dcae 3171 int i;
6973dcae 3172
946c3784
TH
3173 for (i = 0; i < q->nr; i++) {
3174 const struct diff_filepair *p = q->queue[i];
3175
3176 switch (p->status) {
3177 case DIFF_STATUS_DELETED:
3178 case DIFF_STATUS_ADDED:
3179 case DIFF_STATUS_COPIED:
3180 case DIFF_STATUS_RENAMED:
3181 return 0;
3182 default:
3183 if (p->score)
3184 return 0;
3185 if (p->one->mode && p->two->mode &&
3186 p->one->mode != p->two->mode)
3187 return 0;
3188 break;
3189 }
6973dcae 3190 }
946c3784
TH
3191 return 1;
3192}
3193
6973dcae
JH
3194void diff_flush(struct diff_options *options)
3195{
3196 struct diff_queue_struct *q = &diff_queued_diff;
c6744349 3197 int i, output_format = options->output_format;
946c3784 3198 int separator = 0;
6973dcae 3199
c6744349
TH
3200 /*
3201 * Order: raw, stat, summary, patch
3202 * or: name/name-status/checkdiff (other bits clear)
3203 */
946c3784
TH
3204 if (!q->nr)
3205 goto free_queue;
6973dcae 3206
c6744349
TH
3207 if (output_format & (DIFF_FORMAT_RAW |
3208 DIFF_FORMAT_NAME |
3209 DIFF_FORMAT_NAME_STATUS |
3210 DIFF_FORMAT_CHECKDIFF)) {
6973dcae
JH
3211 for (i = 0; i < q->nr; i++) {
3212 struct diff_filepair *p = q->queue[i];
c6744349
TH
3213 if (check_pair_status(p))
3214 flush_one_pair(p, options);
6973dcae 3215 }
946c3784 3216 separator++;
6973dcae 3217 }
c6744349 3218
c04a7155 3219 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
5e2b0636 3220 struct diffstat_t diffstat;
c6744349 3221
5e2b0636
TH
3222 memset(&diffstat, 0, sizeof(struct diffstat_t));
3223 diffstat.xm.consume = diffstat_consume;
6973dcae
JH
3224 for (i = 0; i < q->nr; i++) {
3225 struct diff_filepair *p = q->queue[i];
c6744349 3226 if (check_pair_status(p))
5e2b0636 3227 diff_flush_stat(p, options, &diffstat);
6973dcae 3228 }
74e2abe5
JH
3229 if (output_format & DIFF_FORMAT_NUMSTAT)
3230 show_numstat(&diffstat, options);
3231 if (output_format & DIFF_FORMAT_DIFFSTAT)
3232 show_stats(&diffstat, options);
f604652e 3233 if (output_format & DIFF_FORMAT_SHORTSTAT)
c0c77734 3234 show_shortstats(&diffstat, options);
f604652e 3235 free_diffstat_info(&diffstat);
3969cf7d 3236 separator++;
6973dcae 3237 }
c04a7155
JH
3238 if (output_format & DIFF_FORMAT_DIRSTAT)
3239 show_dirstat(options);
6973dcae 3240
946c3784 3241 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
c6744349 3242 for (i = 0; i < q->nr; i++)
c0c77734 3243 diff_summary(options->file, q->queue[i]);
3969cf7d 3244 separator++;
6973dcae
JH
3245 }
3246
c6744349 3247 if (output_format & DIFF_FORMAT_PATCH) {
946c3784 3248 if (separator) {
6b2fbaaf 3249 putc(options->line_termination, options->file);
946c3784
TH
3250 if (options->stat_sep) {
3251 /* attach patch instead of inline */
c0c77734 3252 fputs(options->stat_sep, options->file);
946c3784 3253 }
c6744349
TH
3254 }
3255
3256 for (i = 0; i < q->nr; i++) {
3257 struct diff_filepair *p = q->queue[i];
3258 if (check_pair_status(p))
3259 diff_flush_patch(p, options);
3260 }
4bbd261b
SE
3261 }
3262
04245581
JK
3263 if (output_format & DIFF_FORMAT_CALLBACK)
3264 options->format_callback(q, options, options->format_callback_data);
3265
c6744349
TH
3266 for (i = 0; i < q->nr; i++)
3267 diff_free_filepair(q->queue[i]);
946c3784 3268free_queue:
6973dcae
JH
3269 free(q->queue);
3270 q->queue = NULL;
3271 q->nr = q->alloc = 0;
c0c77734
DB
3272 if (options->close_file)
3273 fclose(options->file);
6973dcae
JH
3274}
3275
3276static void diffcore_apply_filter(const char *filter)
3277{
3278 int i;
3279 struct diff_queue_struct *q = &diff_queued_diff;
3280 struct diff_queue_struct outq;
3281 outq.queue = NULL;
3282 outq.nr = outq.alloc = 0;
3283
3284 if (!filter)
3285 return;
3286
3287 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
3288 int found;
3289 for (i = found = 0; !found && i < q->nr; i++) {
3290 struct diff_filepair *p = q->queue[i];
3291 if (((p->status == DIFF_STATUS_MODIFIED) &&
3292 ((p->score &&
3293 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3294 (!p->score &&
3295 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3296 ((p->status != DIFF_STATUS_MODIFIED) &&
3297 strchr(filter, p->status)))
3298 found++;
3299 }
3300 if (found)
3301 return;
3302
3303 /* otherwise we will clear the whole queue
3304 * by copying the empty outq at the end of this
3305 * function, but first clear the current entries
3306 * in the queue.
3307 */
3308 for (i = 0; i < q->nr; i++)
3309 diff_free_filepair(q->queue[i]);
3310 }
3311 else {
3312 /* Only the matching ones */
3313 for (i = 0; i < q->nr; i++) {
3314 struct diff_filepair *p = q->queue[i];
3315
3316 if (((p->status == DIFF_STATUS_MODIFIED) &&
3317 ((p->score &&
3318 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
3319 (!p->score &&
3320 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
3321 ((p->status != DIFF_STATUS_MODIFIED) &&
3322 strchr(filter, p->status)))
3323 diff_q(&outq, p);
3324 else
3325 diff_free_filepair(p);
3326 }
3327 }
3328 free(q->queue);
3329 *q = outq;
3330}
3331
5701115a
SV
3332/* Check whether two filespecs with the same mode and size are identical */
3333static int diff_filespec_is_identical(struct diff_filespec *one,
3334 struct diff_filespec *two)
3335{
2b459b48
JH
3336 if (S_ISGITLINK(one->mode))
3337 return 0;
5701115a
SV
3338 if (diff_populate_filespec(one, 0))
3339 return 0;
3340 if (diff_populate_filespec(two, 0))
3341 return 0;
3342 return !memcmp(one->data, two->data, one->size);
3343}
3344
fb13227e
JH
3345static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
3346{
3347 int i;
3348 struct diff_queue_struct *q = &diff_queued_diff;
3349 struct diff_queue_struct outq;
3350 outq.queue = NULL;
3351 outq.nr = outq.alloc = 0;
3352
3353 for (i = 0; i < q->nr; i++) {
3354 struct diff_filepair *p = q->queue[i];
3355
3356 /*
3357 * 1. Entries that come from stat info dirtyness
3358 * always have both sides (iow, not create/delete),
3359 * one side of the object name is unknown, with
3360 * the same mode and size. Keep the ones that
3361 * do not match these criteria. They have real
3362 * differences.
3363 *
3364 * 2. At this point, the file is known to be modified,
3365 * with the same mode and size, and the object
3366 * name of one side is unknown. Need to inspect
3367 * the identical contents.
3368 */
3369 if (!DIFF_FILE_VALID(p->one) || /* (1) */
3370 !DIFF_FILE_VALID(p->two) ||
3371 (p->one->sha1_valid && p->two->sha1_valid) ||
3372 (p->one->mode != p->two->mode) ||
3373 diff_populate_filespec(p->one, 1) ||
3374 diff_populate_filespec(p->two, 1) ||
3375 (p->one->size != p->two->size) ||
5701115a 3376 !diff_filespec_is_identical(p->one, p->two)) /* (2) */
fb13227e
JH
3377 diff_q(&outq, p);
3378 else {
3379 /*
3380 * The caller can subtract 1 from skip_stat_unmatch
3381 * to determine how many paths were dirty only
3382 * due to stat info mismatch.
3383 */
8f67f8ae 3384 if (!DIFF_OPT_TST(diffopt, NO_INDEX))
6d2d9e86 3385 diffopt->skip_stat_unmatch++;
fb13227e
JH
3386 diff_free_filepair(p);
3387 }
3388 }
3389 free(q->queue);
3390 *q = outq;
3391}
3392
6973dcae
JH
3393void diffcore_std(struct diff_options *options)
3394{
8f67f8ae 3395 if (DIFF_OPT_TST(options, QUIET))
68aacb2f 3396 return;
706098af 3397
8f67f8ae 3398 if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
fb13227e 3399 diffcore_skip_stat_unmatch(options);
6973dcae
JH
3400 if (options->break_opt != -1)
3401 diffcore_break(options->break_opt);
3402 if (options->detect_rename)
3403 diffcore_rename(options);
3404 if (options->break_opt != -1)
3405 diffcore_merge_broken();
3406 if (options->pickaxe)
3407 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
3408 if (options->orderfile)
3409 diffcore_order(options->orderfile);
3410 diff_resolve_rename_copy();
3411 diffcore_apply_filter(options->filter);
68aacb2f 3412
8f67f8ae
PH
3413 if (diff_queued_diff.nr)
3414 DIFF_OPT_SET(options, HAS_CHANGES);
3415 else
3416 DIFF_OPT_CLR(options, HAS_CHANGES);
6973dcae
JH
3417}
3418
da31b358
JH
3419int diff_result_code(struct diff_options *opt, int status)
3420{
3421 int result = 0;
3422 if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3423 !(opt->output_format & DIFF_FORMAT_CHECKDIFF))
3424 return status;
3425 if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
3426 DIFF_OPT_TST(opt, HAS_CHANGES))
3427 result |= 01;
3428 if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
3429 DIFF_OPT_TST(opt, CHECK_FAILED))
3430 result |= 02;
3431 return result;
3432}
6973dcae 3433
6973dcae
JH
3434void diff_addremove(struct diff_options *options,
3435 int addremove, unsigned mode,
3436 const unsigned char *sha1,
fd55a19e 3437 const char *concatpath)
6973dcae 3438{
6973dcae
JH
3439 struct diff_filespec *one, *two;
3440
50fd9bd8
JS
3441 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
3442 return;
3443
6973dcae
JH
3444 /* This may look odd, but it is a preparation for
3445 * feeding "there are unchanged files which should
3446 * not produce diffs, but when you are doing copy
3447 * detection you would need them, so here they are"
3448 * entries to the diff-core. They will be prefixed
3449 * with something like '=' or '*' (I haven't decided
3450 * which but should not make any difference).
a6080a0a 3451 * Feeding the same new and old to diff_change()
6973dcae
JH
3452 * also has the same effect.
3453 * Before the final output happens, they are pruned after
3454 * merged into rename/copy pairs as appropriate.
3455 */
8f67f8ae 3456 if (DIFF_OPT_TST(options, REVERSE_DIFF))
6973dcae
JH
3457 addremove = (addremove == '+' ? '-' :
3458 addremove == '-' ? '+' : addremove);
3459
cd676a51
JH
3460 if (options->prefix &&
3461 strncmp(concatpath, options->prefix, options->prefix_length))
3462 return;
3463
6973dcae
JH
3464 one = alloc_filespec(concatpath);
3465 two = alloc_filespec(concatpath);
3466
3467 if (addremove != '+')
3468 fill_filespec(one, sha1, mode);
3469 if (addremove != '-')
3470 fill_filespec(two, sha1, mode);
3471
3472 diff_queue(&diff_queued_diff, one, two);
8f67f8ae 3473 DIFF_OPT_SET(options, HAS_CHANGES);
6973dcae
JH
3474}
3475
3476void diff_change(struct diff_options *options,
3477 unsigned old_mode, unsigned new_mode,
3478 const unsigned char *old_sha1,
3479 const unsigned char *new_sha1,
fd55a19e 3480 const char *concatpath)
6973dcae 3481{
6973dcae
JH
3482 struct diff_filespec *one, *two;
3483
50fd9bd8
JS
3484 if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
3485 && S_ISGITLINK(new_mode))
3486 return;
3487
8f67f8ae 3488 if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
6973dcae
JH
3489 unsigned tmp;
3490 const unsigned char *tmp_c;
3491 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
3492 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3493 }
cd676a51
JH
3494
3495 if (options->prefix &&
3496 strncmp(concatpath, options->prefix, options->prefix_length))
3497 return;
3498
6973dcae
JH
3499 one = alloc_filespec(concatpath);
3500 two = alloc_filespec(concatpath);
3501 fill_filespec(one, old_sha1, old_mode);
3502 fill_filespec(two, new_sha1, new_mode);
3503
3504 diff_queue(&diff_queued_diff, one, two);
8f67f8ae 3505 DIFF_OPT_SET(options, HAS_CHANGES);
6973dcae
JH
3506}
3507
3508void diff_unmerge(struct diff_options *options,
e9c84099
JH
3509 const char *path,
3510 unsigned mode, const unsigned char *sha1)
6973dcae
JH
3511{
3512 struct diff_filespec *one, *two;
cd676a51
JH
3513
3514 if (options->prefix &&
3515 strncmp(path, options->prefix, options->prefix_length))
3516 return;
3517
6973dcae
JH
3518 one = alloc_filespec(path);
3519 two = alloc_filespec(path);
e9c84099
JH
3520 fill_filespec(one, sha1, mode);
3521 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
6973dcae 3522}