Fix some "git ls-files -o" fallout from gitlinks
[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"
6973dcae 11
1510fea7
SP
12#ifdef NO_FAST_WORKING_DIRECTORY
13#define FAST_WORKING_DIRECTORY 0
14#else
15#define FAST_WORKING_DIRECTORY 1
16#endif
17
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18static int use_size_cache;
19
96f1e58f 20static int diff_detect_rename_default;
801235c5 21static int diff_rename_limit_default = -1;
96f1e58f 22static int diff_use_color_default;
6973dcae 23
7c92fe0e 24static char diff_colors[][COLOR_MAXLEN] = {
f37399e6 25 "\033[m", /* reset */
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26 "", /* PLAIN (normal) */
27 "\033[1m", /* METAINFO (bold) */
28 "\033[36m", /* FRAGINFO (cyan) */
29 "\033[31m", /* OLD (red) */
30 "\033[32m", /* NEW (green) */
31 "\033[33m", /* COMMIT (yellow) */
32 "\033[41m", /* WHITESPACE (red background) */
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33};
34
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35static int parse_diff_color_slot(const char *var, int ofs)
36{
37 if (!strcasecmp(var+ofs, "plain"))
38 return DIFF_PLAIN;
39 if (!strcasecmp(var+ofs, "meta"))
40 return DIFF_METAINFO;
41 if (!strcasecmp(var+ofs, "frag"))
42 return DIFF_FRAGINFO;
43 if (!strcasecmp(var+ofs, "old"))
44 return DIFF_FILE_OLD;
45 if (!strcasecmp(var+ofs, "new"))
46 return DIFF_FILE_NEW;
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47 if (!strcasecmp(var+ofs, "commit"))
48 return DIFF_COMMIT;
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49 if (!strcasecmp(var+ofs, "whitespace"))
50 return DIFF_WHITESPACE;
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51 die("bad config variable '%s'", var);
52}
53
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54/*
55 * These are to give UI layer defaults.
56 * The core-level commands such as git-diff-files should
57 * never be affected by the setting of diff.renames
58 * the user happens to have in the configuration file.
59 */
60int git_diff_ui_config(const char *var, const char *value)
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61{
62 if (!strcmp(var, "diff.renamelimit")) {
63 diff_rename_limit_default = git_config_int(var, value);
64 return 0;
65 }
a159ca0c 66 if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
7c92fe0e 67 diff_use_color_default = git_config_colorbool(var, value);
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68 return 0;
69 }
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70 if (!strcmp(var, "diff.renames")) {
71 if (!value)
72 diff_detect_rename_default = DIFF_DETECT_RENAME;
73 else if (!strcasecmp(value, "copies") ||
74 !strcasecmp(value, "copy"))
75 diff_detect_rename_default = DIFF_DETECT_COPY;
76 else if (git_config_bool(var,value))
77 diff_detect_rename_default = DIFF_DETECT_RENAME;
78 return 0;
79 }
1968d77d 80 if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
801235c5 81 int slot = parse_diff_color_slot(var, 11);
7c92fe0e 82 color_parse(value, var, diff_colors[slot]);
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83 return 0;
84 }
85 return git_default_config(var, value);
86}
87
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88static char *quote_one(const char *str)
89{
90 int needlen;
91 char *xp;
92
93 if (!str)
94 return NULL;
95 needlen = quote_c_style(str, NULL, NULL, 0);
96 if (!needlen)
9befac47 97 return xstrdup(str);
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98 xp = xmalloc(needlen + 1);
99 quote_c_style(str, xp, NULL, 0);
100 return xp;
101}
102
103static char *quote_two(const char *one, const char *two)
104{
105 int need_one = quote_c_style(one, NULL, NULL, 1);
106 int need_two = quote_c_style(two, NULL, NULL, 1);
107 char *xp;
108
109 if (need_one + need_two) {
110 if (!need_one) need_one = strlen(one);
111 if (!need_two) need_one = strlen(two);
112
113 xp = xmalloc(need_one + need_two + 3);
114 xp[0] = '"';
115 quote_c_style(one, xp + 1, NULL, 1);
116 quote_c_style(two, xp + need_one + 1, NULL, 1);
117 strcpy(xp + need_one + need_two + 1, "\"");
118 return xp;
119 }
120 need_one = strlen(one);
121 need_two = strlen(two);
122 xp = xmalloc(need_one + need_two + 1);
123 strcpy(xp, one);
124 strcpy(xp + need_one, two);
125 return xp;
126}
127
128static const char *external_diff(void)
129{
130 static const char *external_diff_cmd = NULL;
131 static int done_preparing = 0;
132
133 if (done_preparing)
134 return external_diff_cmd;
135 external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
136 done_preparing = 1;
137 return external_diff_cmd;
138}
139
140#define TEMPFILE_PATH_LEN 50
141
142static struct diff_tempfile {
143 const char *name; /* filename external diff should read from */
144 char hex[41];
145 char mode[10];
146 char tmp_path[TEMPFILE_PATH_LEN];
147} diff_temp[2];
148
149static int count_lines(const char *data, int size)
150{
151 int count, ch, completely_empty = 1, nl_just_seen = 0;
152 count = 0;
153 while (0 < size--) {
154 ch = *data++;
155 if (ch == '\n') {
156 count++;
157 nl_just_seen = 1;
158 completely_empty = 0;
159 }
160 else {
161 nl_just_seen = 0;
162 completely_empty = 0;
163 }
164 }
165 if (completely_empty)
166 return 0;
167 if (!nl_just_seen)
168 count++; /* no trailing newline */
169 return count;
170}
171
172static void print_line_count(int count)
173{
174 switch (count) {
175 case 0:
176 printf("0,0");
177 break;
178 case 1:
179 printf("1");
180 break;
181 default:
182 printf("1,%d", count);
183 break;
184 }
185}
186
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187static void copy_file(int prefix, const char *data, int size,
188 const char *set, const char *reset)
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189{
190 int ch, nl_just_seen = 1;
191 while (0 < size--) {
192 ch = *data++;
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193 if (nl_just_seen) {
194 fputs(set, stdout);
6973dcae 195 putchar(prefix);
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196 }
197 if (ch == '\n') {
6973dcae 198 nl_just_seen = 1;
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199 fputs(reset, stdout);
200 } else
6973dcae 201 nl_just_seen = 0;
13e36ec5 202 putchar(ch);
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203 }
204 if (!nl_just_seen)
13e36ec5 205 printf("%s\n\\ No newline at end of file\n", reset);
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206}
207
208static void emit_rewrite_diff(const char *name_a,
209 const char *name_b,
210 struct diff_filespec *one,
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211 struct diff_filespec *two,
212 int color_diff)
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213{
214 int lc_a, lc_b;
1a9eb3b9 215 const char *name_a_tab, *name_b_tab;
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216 const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
217 const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
218 const char *old = diff_get_color(color_diff, DIFF_FILE_OLD);
219 const char *new = diff_get_color(color_diff, DIFF_FILE_NEW);
220 const char *reset = diff_get_color(color_diff, DIFF_RESET);
1a9eb3b9 221
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222 name_a += (*name_a == '/');
223 name_b += (*name_b == '/');
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224 name_a_tab = strchr(name_a, ' ') ? "\t" : "";
225 name_b_tab = strchr(name_b, ' ') ? "\t" : "";
226
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227 diff_populate_filespec(one, 0);
228 diff_populate_filespec(two, 0);
229 lc_a = count_lines(one->data, one->size);
230 lc_b = count_lines(two->data, two->size);
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231 printf("%s--- a/%s%s%s\n%s+++ b/%s%s%s\n%s@@ -",
232 metainfo, name_a, name_a_tab, reset,
233 metainfo, name_b, name_b_tab, reset, fraginfo);
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234 print_line_count(lc_a);
235 printf(" +");
236 print_line_count(lc_b);
13e36ec5 237 printf(" @@%s\n", reset);
6973dcae 238 if (lc_a)
13e36ec5 239 copy_file('-', one->data, one->size, old, reset);
6973dcae 240 if (lc_b)
13e36ec5 241 copy_file('+', two->data, two->size, new, reset);
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242}
243
244static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
245{
246 if (!DIFF_FILE_VALID(one)) {
d2543b8e 247 mf->ptr = (char *)""; /* does not matter */
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248 mf->size = 0;
249 return 0;
250 }
251 else if (diff_populate_filespec(one, 0))
252 return -1;
253 mf->ptr = one->data;
254 mf->size = one->size;
255 return 0;
256}
257
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258struct diff_words_buffer {
259 mmfile_t text;
260 long alloc;
261 long current; /* output pointer */
262 int suppressed_newline;
263};
264
265static void diff_words_append(char *line, unsigned long len,
266 struct diff_words_buffer *buffer)
267{
268 if (buffer->text.size + len > buffer->alloc) {
269 buffer->alloc = (buffer->text.size + len) * 3 / 2;
270 buffer->text.ptr = xrealloc(buffer->text.ptr, buffer->alloc);
271 }
272 line++;
273 len--;
274 memcpy(buffer->text.ptr + buffer->text.size, line, len);
275 buffer->text.size += len;
276}
277
278struct diff_words_data {
279 struct xdiff_emit_state xm;
280 struct diff_words_buffer minus, plus;
281};
282
283static void print_word(struct diff_words_buffer *buffer, int len, int color,
284 int suppress_newline)
285{
286 const char *ptr;
287 int eol = 0;
288
289 if (len == 0)
290 return;
291
292 ptr = buffer->text.ptr + buffer->current;
293 buffer->current += len;
294
295 if (ptr[len - 1] == '\n') {
296 eol = 1;
297 len--;
298 }
299
300 fputs(diff_get_color(1, color), stdout);
301 fwrite(ptr, len, 1, stdout);
302 fputs(diff_get_color(1, DIFF_RESET), stdout);
303
304 if (eol) {
305 if (suppress_newline)
306 buffer->suppressed_newline = 1;
307 else
308 putchar('\n');
309 }
310}
311
312static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
313{
314 struct diff_words_data *diff_words = priv;
315
316 if (diff_words->minus.suppressed_newline) {
317 if (line[0] != '+')
318 putchar('\n');
319 diff_words->minus.suppressed_newline = 0;
320 }
321
322 len--;
323 switch (line[0]) {
324 case '-':
325 print_word(&diff_words->minus, len, DIFF_FILE_OLD, 1);
326 break;
327 case '+':
328 print_word(&diff_words->plus, len, DIFF_FILE_NEW, 0);
329 break;
330 case ' ':
331 print_word(&diff_words->plus, len, DIFF_PLAIN, 0);
332 diff_words->minus.current += len;
333 break;
334 }
335}
336
337/* this executes the word diff on the accumulated buffers */
338static void diff_words_show(struct diff_words_data *diff_words)
339{
340 xpparam_t xpp;
341 xdemitconf_t xecfg;
342 xdemitcb_t ecb;
343 mmfile_t minus, plus;
344 int i;
345
346 minus.size = diff_words->minus.text.size;
347 minus.ptr = xmalloc(minus.size);
348 memcpy(minus.ptr, diff_words->minus.text.ptr, minus.size);
349 for (i = 0; i < minus.size; i++)
350 if (isspace(minus.ptr[i]))
351 minus.ptr[i] = '\n';
352 diff_words->minus.current = 0;
353
354 plus.size = diff_words->plus.text.size;
355 plus.ptr = xmalloc(plus.size);
356 memcpy(plus.ptr, diff_words->plus.text.ptr, plus.size);
357 for (i = 0; i < plus.size; i++)
358 if (isspace(plus.ptr[i]))
359 plus.ptr[i] = '\n';
360 diff_words->plus.current = 0;
361
362 xpp.flags = XDF_NEED_MINIMAL;
363 xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
364 xecfg.flags = 0;
365 ecb.outf = xdiff_outf;
366 ecb.priv = diff_words;
367 diff_words->xm.consume = fn_out_diff_words_aux;
368 xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
369
370 free(minus.ptr);
371 free(plus.ptr);
372 diff_words->minus.text.size = diff_words->plus.text.size = 0;
373
374 if (diff_words->minus.suppressed_newline) {
375 putchar('\n');
376 diff_words->minus.suppressed_newline = 0;
377 }
378}
379
6973dcae 380struct emit_callback {
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381 struct xdiff_emit_state xm;
382 int nparents, color_diff;
6973dcae 383 const char **label_path;
f59a59e2 384 struct diff_words_data *diff_words;
34a5e1a2 385 int *found_changesp;
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JH
386};
387
f59a59e2
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388static void free_diff_words_data(struct emit_callback *ecbdata)
389{
390 if (ecbdata->diff_words) {
391 /* flush buffers */
392 if (ecbdata->diff_words->minus.text.size ||
393 ecbdata->diff_words->plus.text.size)
394 diff_words_show(ecbdata->diff_words);
395
396 if (ecbdata->diff_words->minus.text.ptr)
397 free (ecbdata->diff_words->minus.text.ptr);
398 if (ecbdata->diff_words->plus.text.ptr)
399 free (ecbdata->diff_words->plus.text.ptr);
400 free(ecbdata->diff_words);
401 ecbdata->diff_words = NULL;
402 }
403}
404
ce436973 405const char *diff_get_color(int diff_use_color, enum color_diff ix)
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406{
407 if (diff_use_color)
50f575fc
LT
408 return diff_colors[ix];
409 return "";
cd112cef
JS
410}
411
448c3ef1
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412static void emit_line(const char *set, const char *reset, const char *line, int len)
413{
414 if (len > 0 && line[len-1] == '\n')
415 len--;
416 fputs(set, stdout);
417 fwrite(line, len, 1, stdout);
418 puts(reset);
419}
420
c5a8c3ec
JS
421static void emit_line_with_ws(int nparents,
422 const char *set, const char *reset, const char *ws,
423 const char *line, int len)
448c3ef1 424{
c5a8c3ec 425 int col0 = nparents;
448c3ef1
JH
426 int last_tab_in_indent = -1;
427 int last_space_in_indent = -1;
428 int i;
429 int tail = len;
430 int need_highlight_leading_space = 0;
448c3ef1
JH
431 /* The line is a newly added line. Does it have funny leading
432 * whitespaces? In indent, SP should never precede a TAB.
433 */
434 for (i = col0; i < len; i++) {
435 if (line[i] == '\t') {
436 last_tab_in_indent = i;
437 if (0 <= last_space_in_indent)
438 need_highlight_leading_space = 1;
439 }
440 else if (line[i] == ' ')
441 last_space_in_indent = i;
442 else
443 break;
444 }
445 fputs(set, stdout);
446 fwrite(line, col0, 1, stdout);
447 fputs(reset, stdout);
448 if (((i == len) || line[i] == '\n') && i != col0) {
449 /* The whole line was indent */
450 emit_line(ws, reset, line + col0, len - col0);
451 return;
452 }
453 i = col0;
454 if (need_highlight_leading_space) {
455 while (i < last_tab_in_indent) {
456 if (line[i] == ' ') {
457 fputs(ws, stdout);
458 putchar(' ');
459 fputs(reset, stdout);
460 }
461 else
462 putchar(line[i]);
463 i++;
464 }
465 }
466 tail = len - 1;
467 if (line[tail] == '\n' && i < tail)
468 tail--;
469 while (i < tail) {
470 if (!isspace(line[tail]))
471 break;
472 tail--;
473 }
474 if ((i < tail && line[tail + 1] != '\n')) {
475 /* This has whitespace between tail+1..len */
476 fputs(set, stdout);
477 fwrite(line + i, tail - i + 1, 1, stdout);
478 fputs(reset, stdout);
479 emit_line(ws, reset, line + tail + 1, len - tail - 1);
480 }
481 else
482 emit_line(set, reset, line + i, len - i);
483}
484
c5a8c3ec
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485static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)
486{
487 const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
488 const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
489
490 if (!*ws)
491 emit_line(set, reset, line, len);
492 else
493 emit_line_with_ws(ecbdata->nparents, set, reset, ws,
494 line, len);
495}
496
cd112cef 497static void fn_out_consume(void *priv, char *line, unsigned long len)
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498{
499 int i;
448c3ef1 500 int color;
6973dcae 501 struct emit_callback *ecbdata = priv;
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502 const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
503 const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
6973dcae 504
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505 *(ecbdata->found_changesp) = 1;
506
6973dcae 507 if (ecbdata->label_path[0]) {
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508 const char *name_a_tab, *name_b_tab;
509
510 name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
511 name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
512
513 printf("%s--- %s%s%s\n",
514 set, ecbdata->label_path[0], reset, name_a_tab);
515 printf("%s+++ %s%s%s\n",
516 set, ecbdata->label_path[1], reset, name_b_tab);
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517 ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
518 }
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519
520 /* This is not really necessary for now because
521 * this codepath only deals with two-way diffs.
522 */
523 for (i = 0; i < len && line[i] == '@'; i++)
524 ;
525 if (2 <= i && i < len && line[i] == ' ') {
526 ecbdata->nparents = i - 1;
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527 emit_line(diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO),
528 reset, line, len);
529 return;
cd112cef 530 }
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531
532 if (len < ecbdata->nparents) {
50f575fc 533 set = reset;
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534 emit_line(reset, reset, line, len);
535 return;
cd112cef 536 }
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537
538 color = DIFF_PLAIN;
539 if (ecbdata->diff_words && ecbdata->nparents != 1)
540 /* fall back to normal diff */
541 free_diff_words_data(ecbdata);
542 if (ecbdata->diff_words) {
543 if (line[0] == '-') {
544 diff_words_append(line, len,
545 &ecbdata->diff_words->minus);
546 return;
547 } else if (line[0] == '+') {
548 diff_words_append(line, len,
549 &ecbdata->diff_words->plus);
550 return;
551 }
552 if (ecbdata->diff_words->minus.text.size ||
553 ecbdata->diff_words->plus.text.size)
554 diff_words_show(ecbdata->diff_words);
555 line++;
50f575fc 556 len--;
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JH
557 emit_line(set, reset, line, len);
558 return;
559 }
560 for (i = 0; i < ecbdata->nparents && len; i++) {
561 if (line[i] == '-')
562 color = DIFF_FILE_OLD;
563 else if (line[i] == '+')
564 color = DIFF_FILE_NEW;
565 }
566
567 if (color != DIFF_FILE_NEW) {
568 emit_line(diff_get_color(ecbdata->color_diff, color),
569 reset, line, len);
570 return;
571 }
572 emit_add_line(reset, ecbdata, line, len);
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JH
573}
574
575static char *pprint_rename(const char *a, const char *b)
576{
577 const char *old = a;
578 const char *new = b;
579 char *name = NULL;
580 int pfx_length, sfx_length;
581 int len_a = strlen(a);
582 int len_b = strlen(b);
e5bfbf9b
AJ
583 int qlen_a = quote_c_style(a, NULL, NULL, 0);
584 int qlen_b = quote_c_style(b, NULL, NULL, 0);
585
586 if (qlen_a || qlen_b) {
587 if (qlen_a) len_a = qlen_a;
588 if (qlen_b) len_b = qlen_b;
589 name = xmalloc( len_a + len_b + 5 );
590 if (qlen_a)
591 quote_c_style(a, name, NULL, 0);
592 else
593 memcpy(name, a, len_a);
594 memcpy(name + len_a, " => ", 4);
595 if (qlen_b)
596 quote_c_style(b, name + len_a + 4, NULL, 0);
597 else
598 memcpy(name + len_a + 4, b, len_b + 1);
599 return name;
600 }
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601
602 /* Find common prefix */
603 pfx_length = 0;
604 while (*old && *new && *old == *new) {
605 if (*old == '/')
606 pfx_length = old - a + 1;
607 old++;
608 new++;
609 }
610
611 /* Find common suffix */
612 old = a + len_a;
613 new = b + len_b;
614 sfx_length = 0;
615 while (a <= old && b <= new && *old == *new) {
616 if (*old == '/')
617 sfx_length = len_a - (old - a);
618 old--;
619 new--;
620 }
621
622 /*
623 * pfx{mid-a => mid-b}sfx
624 * {pfx-a => pfx-b}sfx
625 * pfx{sfx-a => sfx-b}
626 * name-a => name-b
627 */
628 if (pfx_length + sfx_length) {
cc908b82
JH
629 int a_midlen = len_a - pfx_length - sfx_length;
630 int b_midlen = len_b - pfx_length - sfx_length;
631 if (a_midlen < 0) a_midlen = 0;
632 if (b_midlen < 0) b_midlen = 0;
633
e3008464 634 name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
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JH
635 sprintf(name, "%.*s{%.*s => %.*s}%s",
636 pfx_length, a,
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JH
637 a_midlen, a + pfx_length,
638 b_midlen, b + pfx_length,
6973dcae
JH
639 a + len_a - sfx_length);
640 }
641 else {
642 name = xmalloc(len_a + len_b + 5);
643 sprintf(name, "%s => %s", a, b);
644 }
645 return name;
646}
647
648struct diffstat_t {
649 struct xdiff_emit_state xm;
650
651 int nr;
652 int alloc;
653 struct diffstat_file {
654 char *name;
655 unsigned is_unmerged:1;
656 unsigned is_binary:1;
657 unsigned is_renamed:1;
658 unsigned int added, deleted;
659 } **files;
660};
661
662static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
663 const char *name_a,
664 const char *name_b)
665{
666 struct diffstat_file *x;
667 x = xcalloc(sizeof (*x), 1);
668 if (diffstat->nr == diffstat->alloc) {
669 diffstat->alloc = alloc_nr(diffstat->alloc);
670 diffstat->files = xrealloc(diffstat->files,
671 diffstat->alloc * sizeof(x));
672 }
673 diffstat->files[diffstat->nr++] = x;
674 if (name_b) {
675 x->name = pprint_rename(name_a, name_b);
676 x->is_renamed = 1;
677 }
678 else
9befac47 679 x->name = xstrdup(name_a);
6973dcae
JH
680 return x;
681}
682
683static void diffstat_consume(void *priv, char *line, unsigned long len)
684{
685 struct diffstat_t *diffstat = priv;
686 struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
687
688 if (line[0] == '+')
689 x->added++;
690 else if (line[0] == '-')
691 x->deleted++;
692}
693
698ce6f8 694const char mime_boundary_leader[] = "------------";
6973dcae 695
a2540023
JH
696static int scale_linear(int it, int width, int max_change)
697{
698 /*
3ed74e60
JS
699 * make sure that at least one '-' is printed if there were deletions,
700 * and likewise for '+'.
a2540023 701 */
3ed74e60
JS
702 if (max_change < 2)
703 return it;
704 return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
a2540023
JH
705}
706
785f7432
JH
707static void show_name(const char *prefix, const char *name, int len,
708 const char *reset, const char *set)
a2540023 709{
785f7432 710 printf(" %s%s%-*s%s |", set, prefix, len, name, reset);
a2540023
JH
711}
712
785f7432 713static void show_graph(char ch, int cnt, const char *set, const char *reset)
a2540023
JH
714{
715 if (cnt <= 0)
716 return;
785f7432 717 printf("%s", set);
a2540023
JH
718 while (cnt--)
719 putchar(ch);
785f7432 720 printf("%s", reset);
a2540023
JH
721}
722
723static void show_stats(struct diffstat_t* data, struct diff_options *options)
6973dcae 724{
6973dcae 725 int i, len, add, del, total, adds = 0, dels = 0;
a2540023 726 int max_change = 0, max_len = 0;
6973dcae 727 int total_files = data->nr;
a2540023 728 int width, name_width;
785f7432 729 const char *reset, *set, *add_c, *del_c;
6973dcae
JH
730
731 if (data->nr == 0)
732 return;
733
a2540023
JH
734 width = options->stat_width ? options->stat_width : 80;
735 name_width = options->stat_name_width ? options->stat_name_width : 50;
736
737 /* Sanity: give at least 5 columns to the graph,
738 * but leave at least 10 columns for the name.
739 */
740 if (width < name_width + 15) {
741 if (name_width <= 25)
742 width = name_width + 15;
743 else
744 name_width = width - 15;
745 }
746
747 /* Find the longest filename and max number of changes */
785f7432
JH
748 reset = diff_get_color(options->color_diff, DIFF_RESET);
749 set = diff_get_color(options->color_diff, DIFF_PLAIN);
750 add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
751 del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
752
6973dcae
JH
753 for (i = 0; i < data->nr; i++) {
754 struct diffstat_file *file = data->files[i];
a2540023
JH
755 int change = file->added + file->deleted;
756
e5bfbf9b
AJ
757 if (!file->is_renamed) { /* renames are already quoted by pprint_rename */
758 len = quote_c_style(file->name, NULL, NULL, 0);
759 if (len) {
760 char *qname = xmalloc(len + 1);
761 quote_c_style(file->name, qname, NULL, 0);
762 free(file->name);
763 file->name = qname;
764 }
a2540023 765 }
6973dcae
JH
766
767 len = strlen(file->name);
768 if (max_len < len)
769 max_len = len;
770
771 if (file->is_binary || file->is_unmerged)
772 continue;
a2540023
JH
773 if (max_change < change)
774 max_change = change;
6973dcae
JH
775 }
776
a2540023
JH
777 /* Compute the width of the graph part;
778 * 10 is for one blank at the beginning of the line plus
779 * " | count " between the name and the graph.
780 *
781 * From here on, name_width is the width of the name area,
782 * and width is the width of the graph area.
783 */
784 name_width = (name_width < max_len) ? name_width : max_len;
785 if (width < (name_width + 10) + max_change)
786 width = width - (name_width + 10);
787 else
788 width = max_change;
789
6973dcae 790 for (i = 0; i < data->nr; i++) {
d2543b8e 791 const char *prefix = "";
6973dcae
JH
792 char *name = data->files[i]->name;
793 int added = data->files[i]->added;
794 int deleted = data->files[i]->deleted;
a2540023 795 int name_len;
6973dcae
JH
796
797 /*
798 * "scale" the filename
799 */
a2540023
JH
800 len = name_width;
801 name_len = strlen(name);
802 if (name_width < name_len) {
6973dcae
JH
803 char *slash;
804 prefix = "...";
a2540023
JH
805 len -= 3;
806 name += name_len - len;
6973dcae
JH
807 slash = strchr(name, '/');
808 if (slash)
809 name = slash;
810 }
6973dcae
JH
811
812 if (data->files[i]->is_binary) {
785f7432 813 show_name(prefix, name, len, reset, set);
b1882587
AP
814 printf(" Bin ");
815 printf("%s%d%s", del_c, deleted, reset);
816 printf(" -> ");
817 printf("%s%d%s", add_c, added, reset);
818 printf(" bytes");
819 printf("\n");
6973dcae
JH
820 goto free_diffstat_file;
821 }
822 else if (data->files[i]->is_unmerged) {
785f7432 823 show_name(prefix, name, len, reset, set);
a2540023 824 printf(" Unmerged\n");
6973dcae
JH
825 goto free_diffstat_file;
826 }
827 else if (!data->files[i]->is_renamed &&
828 (added + deleted == 0)) {
829 total_files--;
830 goto free_diffstat_file;
831 }
832
a2540023
JH
833 /*
834 * scale the add/delete
835 */
6973dcae
JH
836 add = added;
837 del = deleted;
838 total = add + del;
839 adds += add;
840 dels += del;
841
a2540023 842 if (width <= max_change) {
a2540023 843 add = scale_linear(add, width, max_change);
3ed74e60
JS
844 del = scale_linear(del, width, max_change);
845 total = add + del;
6973dcae 846 }
785f7432 847 show_name(prefix, name, len, reset, set);
a2540023 848 printf("%5d ", added + deleted);
785f7432
JH
849 show_graph('+', add, add_c, reset);
850 show_graph('-', del, del_c, reset);
a2540023 851 putchar('\n');
6973dcae
JH
852 free_diffstat_file:
853 free(data->files[i]->name);
854 free(data->files[i]);
855 }
856 free(data->files);
785f7432
JH
857 printf("%s %d files changed, %d insertions(+), %d deletions(-)%s\n",
858 set, total_files, adds, dels, reset);
6973dcae
JH
859}
860
ebd124c6
NP
861static void show_shortstats(struct diffstat_t* data)
862{
863 int i, adds = 0, dels = 0, total_files = data->nr;
864
865 if (data->nr == 0)
866 return;
867
868 for (i = 0; i < data->nr; i++) {
869 if (!data->files[i]->is_binary &&
870 !data->files[i]->is_unmerged) {
871 int added = data->files[i]->added;
872 int deleted= data->files[i]->deleted;
873 if (!data->files[i]->is_renamed &&
874 (added + deleted == 0)) {
875 total_files--;
876 } else {
877 adds += added;
878 dels += deleted;
879 }
880 }
881 free(data->files[i]->name);
882 free(data->files[i]);
883 }
884 free(data->files);
885
886 printf(" %d files changed, %d insertions(+), %d deletions(-)\n",
887 total_files, adds, dels);
888}
889
74e2abe5
JH
890static void show_numstat(struct diffstat_t* data, struct diff_options *options)
891{
892 int i;
893
894 for (i = 0; i < data->nr; i++) {
895 struct diffstat_file *file = data->files[i];
896
bfddbc5e
JH
897 if (file->is_binary)
898 printf("-\t-\t");
899 else
900 printf("%d\t%d\t", file->added, file->deleted);
e5bfbf9b 901 if (options->line_termination && !file->is_renamed &&
74e2abe5
JH
902 quote_c_style(file->name, NULL, NULL, 0))
903 quote_c_style(file->name, NULL, stdout, 0);
904 else
905 fputs(file->name, stdout);
906 putchar(options->line_termination);
907 }
908}
909
88246898
JS
910struct checkdiff_t {
911 struct xdiff_emit_state xm;
912 const char *filename;
c5a8c3ec 913 int lineno, color_diff;
88246898
JS
914};
915
916static void checkdiff_consume(void *priv, char *line, unsigned long len)
917{
918 struct checkdiff_t *data = priv;
c5a8c3ec
JS
919 const char *ws = diff_get_color(data->color_diff, DIFF_WHITESPACE);
920 const char *reset = diff_get_color(data->color_diff, DIFF_RESET);
921 const char *set = diff_get_color(data->color_diff, DIFF_FILE_NEW);
88246898
JS
922
923 if (line[0] == '+') {
c5a8c3ec 924 int i, spaces = 0, space_before_tab = 0, white_space_at_end = 0;
88246898 925
88246898
JS
926 /* check space before tab */
927 for (i = 1; i < len && (line[i] == ' ' || line[i] == '\t'); i++)
928 if (line[i] == ' ')
929 spaces++;
930 if (line[i - 1] == '\t' && spaces)
c5a8c3ec 931 space_before_tab = 1;
88246898
JS
932
933 /* check white space at line end */
934 if (line[len - 1] == '\n')
935 len--;
936 if (isspace(line[len - 1]))
c5a8c3ec
JS
937 white_space_at_end = 1;
938
939 if (space_before_tab || white_space_at_end) {
940 printf("%s:%d: %s", data->filename, data->lineno, ws);
941 if (space_before_tab) {
942 printf("space before tab");
943 if (white_space_at_end)
944 putchar(',');
945 }
946 if (white_space_at_end)
947 printf("white space at end");
948 printf(":%s ", reset);
949 emit_line_with_ws(1, set, reset, ws, line, len);
950 }
e6d40d65
JS
951
952 data->lineno++;
88246898
JS
953 } else if (line[0] == ' ')
954 data->lineno++;
955 else if (line[0] == '@') {
956 char *plus = strchr(line, '+');
957 if (plus)
9e848163 958 data->lineno = strtol(plus, NULL, 10);
88246898
JS
959 else
960 die("invalid diff");
961 }
962}
963
0660626c
JH
964static unsigned char *deflate_it(char *data,
965 unsigned long size,
966 unsigned long *result_size)
051308f6 967{
0660626c
JH
968 int bound;
969 unsigned char *deflated;
970 z_stream stream;
971
972 memset(&stream, 0, sizeof(stream));
12f6c308 973 deflateInit(&stream, zlib_compression_level);
0660626c
JH
974 bound = deflateBound(&stream, size);
975 deflated = xmalloc(bound);
976 stream.next_out = deflated;
977 stream.avail_out = bound;
978
979 stream.next_in = (unsigned char *)data;
980 stream.avail_in = size;
981 while (deflate(&stream, Z_FINISH) == Z_OK)
982 ; /* nothing */
983 deflateEnd(&stream);
984 *result_size = stream.total_out;
985 return deflated;
051308f6
JH
986}
987
d4c452f0 988static void emit_binary_diff_body(mmfile_t *one, mmfile_t *two)
051308f6 989{
0660626c
JH
990 void *cp;
991 void *delta;
992 void *deflated;
993 void *data;
994 unsigned long orig_size;
995 unsigned long delta_size;
996 unsigned long deflate_size;
997 unsigned long data_size;
051308f6 998
0660626c
JH
999 /* We could do deflated delta, or we could do just deflated two,
1000 * whichever is smaller.
051308f6 1001 */
0660626c
JH
1002 delta = NULL;
1003 deflated = deflate_it(two->ptr, two->size, &deflate_size);
1004 if (one->size && two->size) {
1005 delta = diff_delta(one->ptr, one->size,
1006 two->ptr, two->size,
1007 &delta_size, deflate_size);
1008 if (delta) {
1009 void *to_free = delta;
1010 orig_size = delta_size;
1011 delta = deflate_it(delta, delta_size, &delta_size);
1012 free(to_free);
051308f6
JH
1013 }
1014 }
051308f6 1015
0660626c
JH
1016 if (delta && delta_size < deflate_size) {
1017 printf("delta %lu\n", orig_size);
1018 free(deflated);
1019 data = delta;
1020 data_size = delta_size;
1021 }
1022 else {
1023 printf("literal %lu\n", two->size);
1024 free(delta);
1025 data = deflated;
1026 data_size = deflate_size;
1027 }
051308f6 1028
0660626c
JH
1029 /* emit data encoded in base85 */
1030 cp = data;
1031 while (data_size) {
1032 int bytes = (52 < data_size) ? 52 : data_size;
051308f6 1033 char line[70];
0660626c 1034 data_size -= bytes;
051308f6
JH
1035 if (bytes <= 26)
1036 line[0] = bytes + 'A' - 1;
1037 else
1038 line[0] = bytes - 26 + 'a' - 1;
1039 encode_85(line + 1, cp, bytes);
1d7f171c 1040 cp = (char *) cp + bytes;
051308f6
JH
1041 puts(line);
1042 }
1043 printf("\n");
0660626c 1044 free(data);
051308f6
JH
1045}
1046
d4c452f0
JH
1047static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
1048{
1049 printf("GIT binary patch\n");
1050 emit_binary_diff_body(one, two);
1051 emit_binary_diff_body(two, one);
1052}
1053
6973dcae
JH
1054#define FIRST_FEW_BYTES 8000
1055static int mmfile_is_binary(mmfile_t *mf)
1056{
1057 long sz = mf->size;
1058 if (FIRST_FEW_BYTES < sz)
1059 sz = FIRST_FEW_BYTES;
8c0b2bb6 1060 return !!memchr(mf->ptr, 0, sz);
6973dcae
JH
1061}
1062
1063static void builtin_diff(const char *name_a,
1064 const char *name_b,
1065 struct diff_filespec *one,
1066 struct diff_filespec *two,
1067 const char *xfrm_msg,
051308f6 1068 struct diff_options *o,
6973dcae
JH
1069 int complete_rewrite)
1070{
1071 mmfile_t mf1, mf2;
1072 const char *lbl[2];
1073 char *a_one, *b_two;
ce436973
JK
1074 const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
1075 const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
6973dcae 1076
50892777
JH
1077 a_one = quote_two("a/", name_a + (*name_a == '/'));
1078 b_two = quote_two("b/", name_b + (*name_b == '/'));
6973dcae
JH
1079 lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
1080 lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
50f575fc 1081 printf("%sdiff --git %s %s%s\n", set, a_one, b_two, reset);
6973dcae
JH
1082 if (lbl[0][0] == '/') {
1083 /* /dev/null */
50f575fc
LT
1084 printf("%snew file mode %06o%s\n", set, two->mode, reset);
1085 if (xfrm_msg && xfrm_msg[0])
1086 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1087 }
1088 else if (lbl[1][0] == '/') {
50f575fc
LT
1089 printf("%sdeleted file mode %06o%s\n", set, one->mode, reset);
1090 if (xfrm_msg && xfrm_msg[0])
1091 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1092 }
1093 else {
1094 if (one->mode != two->mode) {
50f575fc
LT
1095 printf("%sold mode %06o%s\n", set, one->mode, reset);
1096 printf("%snew mode %06o%s\n", set, two->mode, reset);
cd112cef 1097 }
50f575fc
LT
1098 if (xfrm_msg && xfrm_msg[0])
1099 printf("%s%s%s\n", set, xfrm_msg, reset);
6973dcae
JH
1100 /*
1101 * we do not run diff between different kind
1102 * of objects.
1103 */
1104 if ((one->mode ^ two->mode) & S_IFMT)
1105 goto free_ab_and_return;
1106 if (complete_rewrite) {
13e36ec5
JS
1107 emit_rewrite_diff(name_a, name_b, one, two,
1108 o->color_diff);
34a5e1a2 1109 o->found_changes = 1;
6973dcae
JH
1110 goto free_ab_and_return;
1111 }
1112 }
1113
1114 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1115 die("unable to read files to diff");
1116
6d64ea96 1117 if (!o->text && (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))) {
0660626c
JH
1118 /* Quite common confusing case */
1119 if (mf1.size == mf2.size &&
1120 !memcmp(mf1.ptr, mf2.ptr, mf1.size))
1121 goto free_ab_and_return;
1122 if (o->binary)
051308f6
JH
1123 emit_binary_diff(&mf1, &mf2);
1124 else
1125 printf("Binary files %s and %s differ\n",
1126 lbl[0], lbl[1]);
34a5e1a2 1127 o->found_changes = 1;
051308f6 1128 }
6973dcae
JH
1129 else {
1130 /* Crazy xdl interfaces.. */
1131 const char *diffopts = getenv("GIT_DIFF_OPTS");
1132 xpparam_t xpp;
1133 xdemitconf_t xecfg;
1134 xdemitcb_t ecb;
1135 struct emit_callback ecbdata;
1136
cd112cef 1137 memset(&ecbdata, 0, sizeof(ecbdata));
6973dcae 1138 ecbdata.label_path = lbl;
cd112cef 1139 ecbdata.color_diff = o->color_diff;
34a5e1a2 1140 ecbdata.found_changesp = &o->found_changes;
0d21efa5 1141 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
ee1e5412 1142 xecfg.ctxlen = o->context;
6973dcae
JH
1143 xecfg.flags = XDL_EMIT_FUNCNAMES;
1144 if (!diffopts)
1145 ;
cc44c765 1146 else if (!prefixcmp(diffopts, "--unified="))
6973dcae 1147 xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
cc44c765 1148 else if (!prefixcmp(diffopts, "-u"))
6973dcae 1149 xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
cd112cef 1150 ecb.outf = xdiff_outf;
6973dcae 1151 ecb.priv = &ecbdata;
cd112cef 1152 ecbdata.xm.consume = fn_out_consume;
f59a59e2
JS
1153 if (o->color_diff_words)
1154 ecbdata.diff_words =
1155 xcalloc(1, sizeof(struct diff_words_data));
6973dcae 1156 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
f59a59e2
JS
1157 if (o->color_diff_words)
1158 free_diff_words_data(&ecbdata);
6973dcae
JH
1159 }
1160
1161 free_ab_and_return:
1162 free(a_one);
1163 free(b_two);
1164 return;
1165}
1166
1167static void builtin_diffstat(const char *name_a, const char *name_b,
1168 struct diff_filespec *one,
1169 struct diff_filespec *two,
710158e3 1170 struct diffstat_t *diffstat,
0d21efa5 1171 struct diff_options *o,
710158e3 1172 int complete_rewrite)
6973dcae
JH
1173{
1174 mmfile_t mf1, mf2;
1175 struct diffstat_file *data;
1176
1177 data = diffstat_add(diffstat, name_a, name_b);
1178
1179 if (!one || !two) {
1180 data->is_unmerged = 1;
1181 return;
1182 }
710158e3
JH
1183 if (complete_rewrite) {
1184 diff_populate_filespec(one, 0);
1185 diff_populate_filespec(two, 0);
1186 data->deleted = count_lines(one->data, one->size);
1187 data->added = count_lines(two->data, two->size);
1188 return;
1189 }
6973dcae
JH
1190 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1191 die("unable to read files to diff");
1192
b1882587 1193 if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2)) {
6973dcae 1194 data->is_binary = 1;
b1882587
AP
1195 data->added = mf2.size;
1196 data->deleted = mf1.size;
1197 } else {
6973dcae
JH
1198 /* Crazy xdl interfaces.. */
1199 xpparam_t xpp;
1200 xdemitconf_t xecfg;
1201 xdemitcb_t ecb;
1202
0d21efa5 1203 xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
6973dcae
JH
1204 xecfg.ctxlen = 0;
1205 xecfg.flags = 0;
1206 ecb.outf = xdiff_outf;
1207 ecb.priv = diffstat;
1208 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1209 }
1210}
1211
88246898
JS
1212static void builtin_checkdiff(const char *name_a, const char *name_b,
1213 struct diff_filespec *one,
c5a8c3ec 1214 struct diff_filespec *two, struct diff_options *o)
88246898
JS
1215{
1216 mmfile_t mf1, mf2;
1217 struct checkdiff_t data;
1218
1219 if (!two)
1220 return;
1221
1222 memset(&data, 0, sizeof(data));
1223 data.xm.consume = checkdiff_consume;
1224 data.filename = name_b ? name_b : name_a;
1225 data.lineno = 0;
c5a8c3ec 1226 data.color_diff = o->color_diff;
88246898
JS
1227
1228 if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
1229 die("unable to read files to diff");
1230
1231 if (mmfile_is_binary(&mf2))
1232 return;
1233 else {
1234 /* Crazy xdl interfaces.. */
1235 xpparam_t xpp;
1236 xdemitconf_t xecfg;
1237 xdemitcb_t ecb;
1238
1239 xpp.flags = XDF_NEED_MINIMAL;
1240 xecfg.ctxlen = 0;
1241 xecfg.flags = 0;
1242 ecb.outf = xdiff_outf;
1243 ecb.priv = &data;
1244 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
1245 }
1246}
1247
6973dcae
JH
1248struct diff_filespec *alloc_filespec(const char *path)
1249{
1250 int namelen = strlen(path);
1251 struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
1252
1253 memset(spec, 0, sizeof(*spec));
1254 spec->path = (char *)(spec + 1);
1255 memcpy(spec->path, path, namelen+1);
1256 return spec;
1257}
1258
1259void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
1260 unsigned short mode)
1261{
1262 if (mode) {
1263 spec->mode = canon_mode(mode);
e702496e 1264 hashcpy(spec->sha1, sha1);
0bef57ee 1265 spec->sha1_valid = !is_null_sha1(sha1);
6973dcae
JH
1266 }
1267}
1268
1269/*
1270 * Given a name and sha1 pair, if the dircache tells us the file in
1271 * the work tree has that object contents, return true, so that
1272 * prepare_temp_file() does not have to inflate and extract.
1273 */
1510fea7 1274static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
6973dcae
JH
1275{
1276 struct cache_entry *ce;
1277 struct stat st;
1278 int pos, len;
1279
1280 /* We do not read the cache ourselves here, because the
1281 * benchmark with my previous version that always reads cache
1282 * shows that it makes things worse for diff-tree comparing
1283 * two linux-2.6 kernel trees in an already checked out work
1284 * tree. This is because most diff-tree comparisons deal with
1285 * only a small number of files, while reading the cache is
1286 * expensive for a large project, and its cost outweighs the
1287 * savings we get by not inflating the object to a temporary
1288 * file. Practically, this code only helps when we are used
1289 * by diff-cache --cached, which does read the cache before
1290 * calling us.
1291 */
1292 if (!active_cache)
1293 return 0;
1294
1510fea7
SP
1295 /* We want to avoid the working directory if our caller
1296 * doesn't need the data in a normal file, this system
1297 * is rather slow with its stat/open/mmap/close syscalls,
1298 * and the object is contained in a pack file. The pack
1299 * is probably already open and will be faster to obtain
1300 * the data through than the working directory. Loose
1301 * objects however would tend to be slower as they need
1302 * to be individually opened and inflated.
1303 */
5caf9232 1304 if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1, NULL))
1510fea7
SP
1305 return 0;
1306
6973dcae
JH
1307 len = strlen(name);
1308 pos = cache_name_pos(name, len);
1309 if (pos < 0)
1310 return 0;
1311 ce = active_cache[pos];
1312 if ((lstat(name, &st) < 0) ||
1313 !S_ISREG(st.st_mode) || /* careful! */
1314 ce_match_stat(ce, &st, 0) ||
a89fccd2 1315 hashcmp(sha1, ce->sha1))
6973dcae
JH
1316 return 0;
1317 /* we return 1 only when we can stat, it is a regular file,
1318 * stat information matches, and sha1 recorded in the cache
1319 * matches. I.e. we know the file in the work tree really is
1320 * the same as the <name, sha1> pair.
1321 */
1322 return 1;
1323}
1324
1325static struct sha1_size_cache {
1326 unsigned char sha1[20];
1327 unsigned long size;
1328} **sha1_size_cache;
1329static int sha1_size_cache_nr, sha1_size_cache_alloc;
1330
1331static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
1332 int find_only,
1333 unsigned long size)
1334{
1335 int first, last;
1336 struct sha1_size_cache *e;
1337
1338 first = 0;
1339 last = sha1_size_cache_nr;
1340 while (last > first) {
1341 int cmp, next = (last + first) >> 1;
1342 e = sha1_size_cache[next];
a89fccd2 1343 cmp = hashcmp(e->sha1, sha1);
6973dcae
JH
1344 if (!cmp)
1345 return e;
1346 if (cmp < 0) {
1347 last = next;
1348 continue;
1349 }
1350 first = next+1;
1351 }
1352 /* not found */
1353 if (find_only)
1354 return NULL;
1355 /* insert to make it at "first" */
1356 if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
1357 sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
1358 sha1_size_cache = xrealloc(sha1_size_cache,
1359 sha1_size_cache_alloc *
1360 sizeof(*sha1_size_cache));
1361 }
1362 sha1_size_cache_nr++;
1363 if (first < sha1_size_cache_nr)
1364 memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
1365 (sha1_size_cache_nr - first - 1) *
1366 sizeof(*sha1_size_cache));
1367 e = xmalloc(sizeof(struct sha1_size_cache));
1368 sha1_size_cache[first] = e;
e702496e 1369 hashcpy(e->sha1, sha1);
6973dcae
JH
1370 e->size = size;
1371 return e;
1372}
1373
3afaa72d
JH
1374static int populate_from_stdin(struct diff_filespec *s)
1375{
1376#define INCREMENT 1024
1377 char *buf;
1378 unsigned long size;
1379 int got;
1380
1381 size = 0;
1382 buf = NULL;
1383 while (1) {
1384 buf = xrealloc(buf, size + INCREMENT);
1385 got = xread(0, buf + size, INCREMENT);
1386 if (!got)
1387 break; /* EOF */
1388 if (got < 0)
1389 return error("error while reading from stdin %s",
1390 strerror(errno));
1391 size += got;
1392 }
1393 s->should_munmap = 0;
1394 s->data = buf;
1395 s->size = size;
1396 s->should_free = 1;
1397 return 0;
1398}
1399
6973dcae
JH
1400/*
1401 * While doing rename detection and pickaxe operation, we may need to
1402 * grab the data for the blob (or file) for our own in-core comparison.
1403 * diff_filespec has data and size fields for this purpose.
1404 */
1405int diff_populate_filespec(struct diff_filespec *s, int size_only)
1406{
1407 int err = 0;
1408 if (!DIFF_FILE_VALID(s))
1409 die("internal error: asking to populate invalid file.");
1410 if (S_ISDIR(s->mode))
1411 return -1;
1412
1413 if (!use_size_cache)
1414 size_only = 0;
1415
1416 if (s->data)
1417 return err;
1418 if (!s->sha1_valid ||
1510fea7 1419 reuse_worktree_file(s->path, s->sha1, 0)) {
6973dcae
JH
1420 struct stat st;
1421 int fd;
6c510bee
LT
1422 char *buf;
1423 unsigned long size;
1424
3afaa72d
JH
1425 if (!strcmp(s->path, "-"))
1426 return populate_from_stdin(s);
1427
6973dcae
JH
1428 if (lstat(s->path, &st) < 0) {
1429 if (errno == ENOENT) {
1430 err_empty:
1431 err = -1;
1432 empty:
d2543b8e 1433 s->data = (char *)"";
6973dcae
JH
1434 s->size = 0;
1435 return err;
1436 }
1437 }
dc49cd76 1438 s->size = xsize_t(st.st_size);
6973dcae
JH
1439 if (!s->size)
1440 goto empty;
1441 if (size_only)
1442 return 0;
1443 if (S_ISLNK(st.st_mode)) {
1444 int ret;
1445 s->data = xmalloc(s->size);
1446 s->should_free = 1;
1447 ret = readlink(s->path, s->data, s->size);
1448 if (ret < 0) {
1449 free(s->data);
1450 goto err_empty;
1451 }
1452 return 0;
1453 }
1454 fd = open(s->path, O_RDONLY);
1455 if (fd < 0)
1456 goto err_empty;
c4712e45 1457 s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
6973dcae 1458 close(fd);
6973dcae 1459 s->should_munmap = 1;
6c510bee
LT
1460
1461 /*
1462 * Convert from working tree format to canonical git format
1463 */
1464 buf = s->data;
1465 size = s->size;
1466 if (convert_to_git(s->path, &buf, &size)) {
1467 munmap(s->data, s->size);
1468 s->should_munmap = 0;
1469 s->data = buf;
1470 s->size = size;
1471 s->should_free = 1;
1472 }
6973dcae
JH
1473 }
1474 else {
21666f1a 1475 enum object_type type;
6973dcae
JH
1476 struct sha1_size_cache *e;
1477
1478 if (size_only) {
1479 e = locate_size_cache(s->sha1, 1, 0);
1480 if (e) {
1481 s->size = e->size;
1482 return 0;
1483 }
21666f1a
NP
1484 type = sha1_object_info(s->sha1, &s->size);
1485 if (type < 0)
6973dcae
JH
1486 locate_size_cache(s->sha1, 0, s->size);
1487 }
1488 else {
21666f1a 1489 s->data = read_sha1_file(s->sha1, &type, &s->size);
6973dcae
JH
1490 s->should_free = 1;
1491 }
1492 }
1493 return 0;
1494}
1495
1496void diff_free_filespec_data(struct diff_filespec *s)
1497{
1498 if (s->should_free)
1499 free(s->data);
1500 else if (s->should_munmap)
1501 munmap(s->data, s->size);
1502 s->should_free = s->should_munmap = 0;
1503 s->data = NULL;
1504 free(s->cnt_data);
1505 s->cnt_data = NULL;
1506}
1507
1508static void prep_temp_blob(struct diff_tempfile *temp,
1509 void *blob,
1510 unsigned long size,
1511 const unsigned char *sha1,
1512 int mode)
1513{
1514 int fd;
1515
1516 fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
1517 if (fd < 0)
1518 die("unable to create temp-file");
93822c22 1519 if (write_in_full(fd, blob, size) != size)
6973dcae
JH
1520 die("unable to write temp-file");
1521 close(fd);
1522 temp->name = temp->tmp_path;
1523 strcpy(temp->hex, sha1_to_hex(sha1));
1524 temp->hex[40] = 0;
1525 sprintf(temp->mode, "%06o", mode);
1526}
1527
1528static void prepare_temp_file(const char *name,
1529 struct diff_tempfile *temp,
1530 struct diff_filespec *one)
1531{
1532 if (!DIFF_FILE_VALID(one)) {
1533 not_a_valid_file:
1534 /* A '-' entry produces this for file-2, and
1535 * a '+' entry produces this for file-1.
1536 */
1537 temp->name = "/dev/null";
1538 strcpy(temp->hex, ".");
1539 strcpy(temp->mode, ".");
1540 return;
1541 }
1542
1543 if (!one->sha1_valid ||
1510fea7 1544 reuse_worktree_file(name, one->sha1, 1)) {
6973dcae
JH
1545 struct stat st;
1546 if (lstat(name, &st) < 0) {
1547 if (errno == ENOENT)
1548 goto not_a_valid_file;
1549 die("stat(%s): %s", name, strerror(errno));
1550 }
1551 if (S_ISLNK(st.st_mode)) {
1552 int ret;
1553 char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
dc49cd76 1554 size_t sz = xsize_t(st.st_size);
6973dcae
JH
1555 if (sizeof(buf) <= st.st_size)
1556 die("symlink too long: %s", name);
dc49cd76 1557 ret = readlink(name, buf, sz);
6973dcae
JH
1558 if (ret < 0)
1559 die("readlink(%s)", name);
dc49cd76 1560 prep_temp_blob(temp, buf, sz,
6973dcae
JH
1561 (one->sha1_valid ?
1562 one->sha1 : null_sha1),
1563 (one->sha1_valid ?
1564 one->mode : S_IFLNK));
1565 }
1566 else {
1567 /* we can borrow from the file in the work tree */
1568 temp->name = name;
1569 if (!one->sha1_valid)
1570 strcpy(temp->hex, sha1_to_hex(null_sha1));
1571 else
1572 strcpy(temp->hex, sha1_to_hex(one->sha1));
1573 /* Even though we may sometimes borrow the
1574 * contents from the work tree, we always want
1575 * one->mode. mode is trustworthy even when
1576 * !(one->sha1_valid), as long as
1577 * DIFF_FILE_VALID(one).
1578 */
1579 sprintf(temp->mode, "%06o", one->mode);
1580 }
1581 return;
1582 }
1583 else {
1584 if (diff_populate_filespec(one, 0))
1585 die("cannot read data blob for %s", one->path);
1586 prep_temp_blob(temp, one->data, one->size,
1587 one->sha1, one->mode);
1588 }
1589}
1590
1591static void remove_tempfile(void)
1592{
1593 int i;
1594
1595 for (i = 0; i < 2; i++)
1596 if (diff_temp[i].name == diff_temp[i].tmp_path) {
1597 unlink(diff_temp[i].name);
1598 diff_temp[i].name = NULL;
1599 }
1600}
1601
1602static void remove_tempfile_on_signal(int signo)
1603{
1604 remove_tempfile();
1605 signal(SIGINT, SIG_DFL);
1606 raise(signo);
1607}
1608
1609static int spawn_prog(const char *pgm, const char **arg)
1610{
1611 pid_t pid;
1612 int status;
1613
1614 fflush(NULL);
1615 pid = fork();
1616 if (pid < 0)
1617 die("unable to fork");
1618 if (!pid) {
1619 execvp(pgm, (char *const*) arg);
1620 exit(255);
1621 }
1622
1623 while (waitpid(pid, &status, 0) < 0) {
1624 if (errno == EINTR)
1625 continue;
1626 return -1;
1627 }
1628
1629 /* Earlier we did not check the exit status because
1630 * diff exits non-zero if files are different, and
1631 * we are not interested in knowing that. It was a
1632 * mistake which made it harder to quit a diff-*
1633 * session that uses the git-apply-patch-script as
1634 * the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
1635 * should also exit non-zero only when it wants to
1636 * abort the entire diff-* session.
1637 */
1638 if (WIFEXITED(status) && !WEXITSTATUS(status))
1639 return 0;
1640 return -1;
1641}
1642
1643/* An external diff command takes:
1644 *
1645 * diff-cmd name infile1 infile1-sha1 infile1-mode \
1646 * infile2 infile2-sha1 infile2-mode [ rename-to ]
1647 *
1648 */
1649static void run_external_diff(const char *pgm,
1650 const char *name,
1651 const char *other,
1652 struct diff_filespec *one,
1653 struct diff_filespec *two,
1654 const char *xfrm_msg,
1655 int complete_rewrite)
1656{
1657 const char *spawn_arg[10];
1658 struct diff_tempfile *temp = diff_temp;
1659 int retval;
1660 static int atexit_asked = 0;
1661 const char *othername;
1662 const char **arg = &spawn_arg[0];
1663
1664 othername = (other? other : name);
1665 if (one && two) {
1666 prepare_temp_file(name, &temp[0], one);
1667 prepare_temp_file(othername, &temp[1], two);
1668 if (! atexit_asked &&
1669 (temp[0].name == temp[0].tmp_path ||
1670 temp[1].name == temp[1].tmp_path)) {
1671 atexit_asked = 1;
1672 atexit(remove_tempfile);
1673 }
1674 signal(SIGINT, remove_tempfile_on_signal);
1675 }
1676
1677 if (one && two) {
1678 *arg++ = pgm;
1679 *arg++ = name;
1680 *arg++ = temp[0].name;
1681 *arg++ = temp[0].hex;
1682 *arg++ = temp[0].mode;
1683 *arg++ = temp[1].name;
1684 *arg++ = temp[1].hex;
1685 *arg++ = temp[1].mode;
1686 if (other) {
1687 *arg++ = other;
1688 *arg++ = xfrm_msg;
1689 }
1690 } else {
1691 *arg++ = pgm;
1692 *arg++ = name;
1693 }
1694 *arg = NULL;
1695 retval = spawn_prog(pgm, spawn_arg);
1696 remove_tempfile();
1697 if (retval) {
1698 fprintf(stderr, "external diff died, stopping at %s.\n", name);
1699 exit(1);
1700 }
1701}
1702
1703static void run_diff_cmd(const char *pgm,
1704 const char *name,
1705 const char *other,
1706 struct diff_filespec *one,
1707 struct diff_filespec *two,
1708 const char *xfrm_msg,
051308f6 1709 struct diff_options *o,
6973dcae
JH
1710 int complete_rewrite)
1711{
1712 if (pgm) {
1713 run_external_diff(pgm, name, other, one, two, xfrm_msg,
1714 complete_rewrite);
1715 return;
1716 }
1717 if (one && two)
1718 builtin_diff(name, other ? other : name,
051308f6 1719 one, two, xfrm_msg, o, complete_rewrite);
6973dcae
JH
1720 else
1721 printf("* Unmerged path %s\n", name);
1722}
1723
1724static void diff_fill_sha1_info(struct diff_filespec *one)
1725{
1726 if (DIFF_FILE_VALID(one)) {
1727 if (!one->sha1_valid) {
1728 struct stat st;
5332b2af
JS
1729 if (!strcmp(one->path, "-")) {
1730 hashcpy(one->sha1, null_sha1);
1731 return;
1732 }
6973dcae
JH
1733 if (lstat(one->path, &st) < 0)
1734 die("stat %s", one->path);
1735 if (index_path(one->sha1, one->path, &st, 0))
1736 die("cannot hash %s\n", one->path);
1737 }
1738 }
1739 else
e702496e 1740 hashclr(one->sha1);
6973dcae
JH
1741}
1742
1743static void run_diff(struct diff_filepair *p, struct diff_options *o)
1744{
1745 const char *pgm = external_diff();
1746 char msg[PATH_MAX*2+300], *xfrm_msg;
1747 struct diff_filespec *one;
1748 struct diff_filespec *two;
1749 const char *name;
1750 const char *other;
1751 char *name_munged, *other_munged;
1752 int complete_rewrite = 0;
1753 int len;
1754
1755 if (DIFF_PAIR_UNMERGED(p)) {
1756 /* unmerged */
051308f6 1757 run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
6973dcae
JH
1758 return;
1759 }
1760
1761 name = p->one->path;
1762 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1763 name_munged = quote_one(name);
1764 other_munged = quote_one(other);
1765 one = p->one; two = p->two;
1766
1767 diff_fill_sha1_info(one);
1768 diff_fill_sha1_info(two);
1769
1770 len = 0;
1771 switch (p->status) {
1772 case DIFF_STATUS_COPIED:
1773 len += snprintf(msg + len, sizeof(msg) - len,
1774 "similarity index %d%%\n"
1775 "copy from %s\n"
1776 "copy to %s\n",
1777 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1778 name_munged, other_munged);
1779 break;
1780 case DIFF_STATUS_RENAMED:
1781 len += snprintf(msg + len, sizeof(msg) - len,
1782 "similarity index %d%%\n"
1783 "rename from %s\n"
1784 "rename to %s\n",
1785 (int)(0.5 + p->score * 100.0/MAX_SCORE),
1786 name_munged, other_munged);
1787 break;
1788 case DIFF_STATUS_MODIFIED:
1789 if (p->score) {
1790 len += snprintf(msg + len, sizeof(msg) - len,
1791 "dissimilarity index %d%%\n",
1792 (int)(0.5 + p->score *
1793 100.0/MAX_SCORE));
1794 complete_rewrite = 1;
1795 break;
1796 }
1797 /* fallthru */
1798 default:
1799 /* nothing */
1800 ;
1801 }
1802
a89fccd2 1803 if (hashcmp(one->sha1, two->sha1)) {
6973dcae 1804 int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
6973dcae 1805
82793c55
JH
1806 if (o->binary) {
1807 mmfile_t mf;
1808 if ((!fill_mmfile(&mf, one) && mmfile_is_binary(&mf)) ||
1809 (!fill_mmfile(&mf, two) && mmfile_is_binary(&mf)))
1810 abbrev = 40;
1811 }
6973dcae
JH
1812 len += snprintf(msg + len, sizeof(msg) - len,
1813 "index %.*s..%.*s",
dcb3450f
LT
1814 abbrev, sha1_to_hex(one->sha1),
1815 abbrev, sha1_to_hex(two->sha1));
6973dcae
JH
1816 if (one->mode == two->mode)
1817 len += snprintf(msg + len, sizeof(msg) - len,
1818 " %06o", one->mode);
1819 len += snprintf(msg + len, sizeof(msg) - len, "\n");
1820 }
1821
1822 if (len)
1823 msg[--len] = 0;
1824 xfrm_msg = len ? msg : NULL;
1825
1826 if (!pgm &&
1827 DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
1828 (S_IFMT & one->mode) != (S_IFMT & two->mode)) {
1829 /* a filepair that changes between file and symlink
1830 * needs to be split into deletion and creation.
1831 */
1832 struct diff_filespec *null = alloc_filespec(two->path);
051308f6 1833 run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
6973dcae
JH
1834 free(null);
1835 null = alloc_filespec(one->path);
051308f6 1836 run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
6973dcae
JH
1837 free(null);
1838 }
1839 else
051308f6 1840 run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
6973dcae
JH
1841 complete_rewrite);
1842
1843 free(name_munged);
1844 free(other_munged);
1845}
1846
1847static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
1848 struct diffstat_t *diffstat)
1849{
1850 const char *name;
1851 const char *other;
710158e3 1852 int complete_rewrite = 0;
6973dcae
JH
1853
1854 if (DIFF_PAIR_UNMERGED(p)) {
1855 /* unmerged */
0d21efa5 1856 builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
6973dcae
JH
1857 return;
1858 }
1859
1860 name = p->one->path;
1861 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1862
1863 diff_fill_sha1_info(p->one);
1864 diff_fill_sha1_info(p->two);
1865
710158e3
JH
1866 if (p->status == DIFF_STATUS_MODIFIED && p->score)
1867 complete_rewrite = 1;
0d21efa5 1868 builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
6973dcae
JH
1869}
1870
88246898
JS
1871static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
1872{
1873 const char *name;
1874 const char *other;
1875
1876 if (DIFF_PAIR_UNMERGED(p)) {
1877 /* unmerged */
1878 return;
1879 }
1880
1881 name = p->one->path;
1882 other = (strcmp(name, p->two->path) ? p->two->path : NULL);
1883
1884 diff_fill_sha1_info(p->one);
1885 diff_fill_sha1_info(p->two);
1886
c5a8c3ec 1887 builtin_checkdiff(name, other, p->one, p->two, o);
88246898
JS
1888}
1889
6973dcae
JH
1890void diff_setup(struct diff_options *options)
1891{
1892 memset(options, 0, sizeof(*options));
6973dcae
JH
1893 options->line_termination = '\n';
1894 options->break_opt = -1;
1895 options->rename_limit = -1;
ee1e5412 1896 options->context = 3;
3969cf7d 1897 options->msg_sep = "";
6973dcae
JH
1898
1899 options->change = diff_change;
1900 options->add_remove = diff_addremove;
801235c5 1901 options->color_diff = diff_use_color_default;
b68ea12e 1902 options->detect_rename = diff_detect_rename_default;
6973dcae
JH
1903}
1904
1905int diff_setup_done(struct diff_options *options)
1906{
d7de00f7
TH
1907 int count = 0;
1908
1909 if (options->output_format & DIFF_FORMAT_NAME)
1910 count++;
1911 if (options->output_format & DIFF_FORMAT_NAME_STATUS)
1912 count++;
1913 if (options->output_format & DIFF_FORMAT_CHECKDIFF)
1914 count++;
1915 if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
1916 count++;
1917 if (count > 1)
1918 die("--name-only, --name-status, --check and -s are mutually exclusive");
1919
03b9d560
JH
1920 if (options->find_copies_harder)
1921 options->detect_rename = DIFF_DETECT_COPY;
1922
c6744349
TH
1923 if (options->output_format & (DIFF_FORMAT_NAME |
1924 DIFF_FORMAT_NAME_STATUS |
1925 DIFF_FORMAT_CHECKDIFF |
1926 DIFF_FORMAT_NO_OUTPUT))
1927 options->output_format &= ~(DIFF_FORMAT_RAW |
74e2abe5 1928 DIFF_FORMAT_NUMSTAT |
c6744349 1929 DIFF_FORMAT_DIFFSTAT |
ebd124c6 1930 DIFF_FORMAT_SHORTSTAT |
c6744349
TH
1931 DIFF_FORMAT_SUMMARY |
1932 DIFF_FORMAT_PATCH);
1933
6973dcae
JH
1934 /*
1935 * These cases always need recursive; we do not drop caller-supplied
1936 * recursive bits for other formats here.
1937 */
c6744349 1938 if (options->output_format & (DIFF_FORMAT_PATCH |
74e2abe5 1939 DIFF_FORMAT_NUMSTAT |
c6744349 1940 DIFF_FORMAT_DIFFSTAT |
ebd124c6 1941 DIFF_FORMAT_SHORTSTAT |
d7014dc0 1942 DIFF_FORMAT_SUMMARY |
c6744349 1943 DIFF_FORMAT_CHECKDIFF))
6973dcae 1944 options->recursive = 1;
5e363541 1945 /*
3969cf7d 1946 * Also pickaxe would not work very well if you do not say recursive
5e363541 1947 */
3969cf7d
JH
1948 if (options->pickaxe)
1949 options->recursive = 1;
5e363541 1950
6973dcae
JH
1951 if (options->detect_rename && options->rename_limit < 0)
1952 options->rename_limit = diff_rename_limit_default;
1953 if (options->setup & DIFF_SETUP_USE_CACHE) {
1954 if (!active_cache)
1955 /* read-cache does not die even when it fails
1956 * so it is safe for us to do this here. Also
1957 * it does not smudge active_cache or active_nr
1958 * when it fails, so we do not have to worry about
1959 * cleaning it up ourselves either.
1960 */
1961 read_cache();
1962 }
1963 if (options->setup & DIFF_SETUP_USE_SIZE_CACHE)
1964 use_size_cache = 1;
1965 if (options->abbrev <= 0 || 40 < options->abbrev)
1966 options->abbrev = 40; /* full */
1967
68aacb2f
JH
1968 /*
1969 * It does not make sense to show the first hit we happened
1970 * to have found. It does not make sense not to return with
1971 * exit code in such a case either.
1972 */
1973 if (options->quiet) {
1974 options->output_format = DIFF_FORMAT_NO_OUTPUT;
1975 options->exit_with_status = 1;
1976 }
1977
1978 /*
1979 * If we postprocess in diffcore, we cannot simply return
1980 * upon the first hit. We need to run diff as usual.
1981 */
1982 if (options->pickaxe || options->filter)
1983 options->quiet = 0;
1984
6973dcae
JH
1985 return 0;
1986}
1987
d2543b8e 1988static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
ee1e5412
LT
1989{
1990 char c, *eq;
1991 int len;
1992
1993 if (*arg != '-')
1994 return 0;
1995 c = *++arg;
1996 if (!c)
1997 return 0;
1998 if (c == arg_short) {
1999 c = *++arg;
2000 if (!c)
2001 return 1;
2002 if (val && isdigit(c)) {
2003 char *end;
2004 int n = strtoul(arg, &end, 10);
2005 if (*end)
2006 return 0;
2007 *val = n;
2008 return 1;
2009 }
2010 return 0;
2011 }
2012 if (c != '-')
2013 return 0;
2014 arg++;
2015 eq = strchr(arg, '=');
2016 if (eq)
2017 len = eq - arg;
2018 else
2019 len = strlen(arg);
2020 if (!len || strncmp(arg, arg_long, len))
2021 return 0;
2022 if (eq) {
2023 int n;
2024 char *end;
2025 if (!isdigit(*++eq))
2026 return 0;
2027 n = strtoul(eq, &end, 10);
2028 if (*end)
2029 return 0;
2030 *val = n;
2031 }
2032 return 1;
2033}
2034
6973dcae
JH
2035int diff_opt_parse(struct diff_options *options, const char **av, int ac)
2036{
2037 const char *arg = av[0];
2038 if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
c6744349 2039 options->output_format |= DIFF_FORMAT_PATCH;
ee1e5412 2040 else if (opt_arg(arg, 'U', "unified", &options->context))
c6744349 2041 options->output_format |= DIFF_FORMAT_PATCH;
a610786f
TH
2042 else if (!strcmp(arg, "--raw"))
2043 options->output_format |= DIFF_FORMAT_RAW;
6973dcae 2044 else if (!strcmp(arg, "--patch-with-raw")) {
c6744349 2045 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
6973dcae 2046 }
74e2abe5
JH
2047 else if (!strcmp(arg, "--numstat")) {
2048 options->output_format |= DIFF_FORMAT_NUMSTAT;
2049 }
ebd124c6
NP
2050 else if (!strcmp(arg, "--shortstat")) {
2051 options->output_format |= DIFF_FORMAT_SHORTSTAT;
2052 }
cc44c765 2053 else if (!prefixcmp(arg, "--stat")) {
5c5b2ea9
LT
2054 char *end;
2055 int width = options->stat_width;
2056 int name_width = options->stat_name_width;
2057 arg += 6;
2058 end = (char *)arg;
2059
2060 switch (*arg) {
2061 case '-':
cc44c765 2062 if (!prefixcmp(arg, "-width="))
5c5b2ea9 2063 width = strtoul(arg + 7, &end, 10);
cc44c765 2064 else if (!prefixcmp(arg, "-name-width="))
5c5b2ea9
LT
2065 name_width = strtoul(arg + 12, &end, 10);
2066 break;
2067 case '=':
2068 width = strtoul(arg+1, &end, 10);
2069 if (*end == ',')
2070 name_width = strtoul(end+1, &end, 10);
2071 }
2072
2073 /* Important! This checks all the error cases! */
2074 if (*end)
2075 return 0;
c6744349 2076 options->output_format |= DIFF_FORMAT_DIFFSTAT;
5c5b2ea9
LT
2077 options->stat_name_width = name_width;
2078 options->stat_width = width;
a2540023 2079 }
88246898 2080 else if (!strcmp(arg, "--check"))
c6744349 2081 options->output_format |= DIFF_FORMAT_CHECKDIFF;
4bbd261b 2082 else if (!strcmp(arg, "--summary"))
c6744349 2083 options->output_format |= DIFF_FORMAT_SUMMARY;
6973dcae 2084 else if (!strcmp(arg, "--patch-with-stat")) {
c6744349 2085 options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
6973dcae
JH
2086 }
2087 else if (!strcmp(arg, "-z"))
2088 options->line_termination = 0;
cc44c765 2089 else if (!prefixcmp(arg, "-l"))
6973dcae
JH
2090 options->rename_limit = strtoul(arg+2, NULL, 10);
2091 else if (!strcmp(arg, "--full-index"))
2092 options->full_index = 1;
0660626c 2093 else if (!strcmp(arg, "--binary")) {
c6744349 2094 options->output_format |= DIFF_FORMAT_PATCH;
82793c55 2095 options->binary = 1;
0660626c 2096 }
63ac4501 2097 else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
6d64ea96
SF
2098 options->text = 1;
2099 }
6973dcae 2100 else if (!strcmp(arg, "--name-only"))
c6744349 2101 options->output_format |= DIFF_FORMAT_NAME;
6973dcae 2102 else if (!strcmp(arg, "--name-status"))
c6744349 2103 options->output_format |= DIFF_FORMAT_NAME_STATUS;
6973dcae
JH
2104 else if (!strcmp(arg, "-R"))
2105 options->reverse_diff = 1;
cc44c765 2106 else if (!prefixcmp(arg, "-S"))
6973dcae 2107 options->pickaxe = arg + 2;
c6744349
TH
2108 else if (!strcmp(arg, "-s")) {
2109 options->output_format |= DIFF_FORMAT_NO_OUTPUT;
2110 }
cc44c765 2111 else if (!prefixcmp(arg, "-O"))
6973dcae 2112 options->orderfile = arg + 2;
cc44c765 2113 else if (!prefixcmp(arg, "--diff-filter="))
6973dcae
JH
2114 options->filter = arg + 14;
2115 else if (!strcmp(arg, "--pickaxe-all"))
2116 options->pickaxe_opts = DIFF_PICKAXE_ALL;
2117 else if (!strcmp(arg, "--pickaxe-regex"))
2118 options->pickaxe_opts = DIFF_PICKAXE_REGEX;
cc44c765 2119 else if (!prefixcmp(arg, "-B")) {
6973dcae
JH
2120 if ((options->break_opt =
2121 diff_scoreopt_parse(arg)) == -1)
2122 return -1;
2123 }
cc44c765 2124 else if (!prefixcmp(arg, "-M")) {
6973dcae
JH
2125 if ((options->rename_score =
2126 diff_scoreopt_parse(arg)) == -1)
2127 return -1;
2128 options->detect_rename = DIFF_DETECT_RENAME;
2129 }
cc44c765 2130 else if (!prefixcmp(arg, "-C")) {
6973dcae
JH
2131 if ((options->rename_score =
2132 diff_scoreopt_parse(arg)) == -1)
2133 return -1;
2134 options->detect_rename = DIFF_DETECT_COPY;
2135 }
2136 else if (!strcmp(arg, "--find-copies-harder"))
2137 options->find_copies_harder = 1;
2138 else if (!strcmp(arg, "--abbrev"))
2139 options->abbrev = DEFAULT_ABBREV;
cc44c765 2140 else if (!prefixcmp(arg, "--abbrev=")) {
6973dcae
JH
2141 options->abbrev = strtoul(arg + 9, NULL, 10);
2142 if (options->abbrev < MINIMUM_ABBREV)
2143 options->abbrev = MINIMUM_ABBREV;
2144 else if (40 < options->abbrev)
2145 options->abbrev = 40;
2146 }
cd112cef
JS
2147 else if (!strcmp(arg, "--color"))
2148 options->color_diff = 1;
fef88bb0
JH
2149 else if (!strcmp(arg, "--no-color"))
2150 options->color_diff = 0;
0d21efa5
JS
2151 else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
2152 options->xdl_opts |= XDF_IGNORE_WHITESPACE;
2153 else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
2154 options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
859f9c45
JS
2155 else if (!strcmp(arg, "--ignore-space-at-eol"))
2156 options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
f59a59e2
JS
2157 else if (!strcmp(arg, "--color-words"))
2158 options->color_diff = options->color_diff_words = 1;
b68ea12e
EW
2159 else if (!strcmp(arg, "--no-renames"))
2160 options->detect_rename = 0;
41bbf9d5
AR
2161 else if (!strcmp(arg, "--exit-code"))
2162 options->exit_with_status = 1;
68aacb2f
JH
2163 else if (!strcmp(arg, "--quiet"))
2164 options->quiet = 1;
6973dcae
JH
2165 else
2166 return 0;
2167 return 1;
2168}
2169
2170static int parse_num(const char **cp_p)
2171{
2172 unsigned long num, scale;
2173 int ch, dot;
2174 const char *cp = *cp_p;
2175
2176 num = 0;
2177 scale = 1;
2178 dot = 0;
2179 for(;;) {
2180 ch = *cp;
2181 if ( !dot && ch == '.' ) {
2182 scale = 1;
2183 dot = 1;
2184 } else if ( ch == '%' ) {
2185 scale = dot ? scale*100 : 100;
2186 cp++; /* % is always at the end */
2187 break;
2188 } else if ( ch >= '0' && ch <= '9' ) {
2189 if ( scale < 100000 ) {
2190 scale *= 10;
2191 num = (num*10) + (ch-'0');
2192 }
2193 } else {
2194 break;
2195 }
2196 cp++;
2197 }
2198 *cp_p = cp;
2199
2200 /* user says num divided by scale and we say internally that
2201 * is MAX_SCORE * num / scale.
2202 */
dc49cd76 2203 return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
6973dcae
JH
2204}
2205
2206int diff_scoreopt_parse(const char *opt)
2207{
2208 int opt1, opt2, cmd;
2209
2210 if (*opt++ != '-')
2211 return -1;
2212 cmd = *opt++;
2213 if (cmd != 'M' && cmd != 'C' && cmd != 'B')
2214 return -1; /* that is not a -M, -C nor -B option */
2215
2216 opt1 = parse_num(&opt);
2217 if (cmd != 'B')
2218 opt2 = 0;
2219 else {
2220 if (*opt == 0)
2221 opt2 = 0;
2222 else if (*opt != '/')
2223 return -1; /* we expect -B80/99 or -B80 */
2224 else {
2225 opt++;
2226 opt2 = parse_num(&opt);
2227 }
2228 }
2229 if (*opt != 0)
2230 return -1;
2231 return opt1 | (opt2 << 16);
2232}
2233
2234struct diff_queue_struct diff_queued_diff;
2235
2236void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
2237{
2238 if (queue->alloc <= queue->nr) {
2239 queue->alloc = alloc_nr(queue->alloc);
2240 queue->queue = xrealloc(queue->queue,
2241 sizeof(dp) * queue->alloc);
2242 }
2243 queue->queue[queue->nr++] = dp;
2244}
2245
2246struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
2247 struct diff_filespec *one,
2248 struct diff_filespec *two)
2249{
ef677686 2250 struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
6973dcae
JH
2251 dp->one = one;
2252 dp->two = two;
6973dcae
JH
2253 if (queue)
2254 diff_q(queue, dp);
2255 return dp;
2256}
2257
2258void diff_free_filepair(struct diff_filepair *p)
2259{
2260 diff_free_filespec_data(p->one);
2261 diff_free_filespec_data(p->two);
2262 free(p->one);
2263 free(p->two);
2264 free(p);
2265}
2266
2267/* This is different from find_unique_abbrev() in that
2268 * it stuffs the result with dots for alignment.
2269 */
2270const char *diff_unique_abbrev(const unsigned char *sha1, int len)
2271{
2272 int abblen;
2273 const char *abbrev;
2274 if (len == 40)
2275 return sha1_to_hex(sha1);
2276
2277 abbrev = find_unique_abbrev(sha1, len);
2278 if (!abbrev)
2279 return sha1_to_hex(sha1);
2280 abblen = strlen(abbrev);
2281 if (abblen < 37) {
2282 static char hex[41];
2283 if (len < abblen && abblen <= len + 2)
2284 sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
2285 else
2286 sprintf(hex, "%s...", abbrev);
2287 return hex;
2288 }
2289 return sha1_to_hex(sha1);
2290}
2291
2292static void diff_flush_raw(struct diff_filepair *p,
c6744349 2293 struct diff_options *options)
6973dcae
JH
2294{
2295 int two_paths;
2296 char status[10];
2297 int abbrev = options->abbrev;
2298 const char *path_one, *path_two;
c6744349
TH
2299 int inter_name_termination = '\t';
2300 int line_termination = options->line_termination;
2301
2302 if (!line_termination)
2303 inter_name_termination = 0;
6973dcae
JH
2304
2305 path_one = p->one->path;
2306 path_two = p->two->path;
2307 if (line_termination) {
2308 path_one = quote_one(path_one);
2309 path_two = quote_one(path_two);
2310 }
2311
2312 if (p->score)
2313 sprintf(status, "%c%03d", p->status,
2314 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2315 else {
2316 status[0] = p->status;
2317 status[1] = 0;
2318 }
2319 switch (p->status) {
2320 case DIFF_STATUS_COPIED:
2321 case DIFF_STATUS_RENAMED:
2322 two_paths = 1;
2323 break;
2324 case DIFF_STATUS_ADDED:
2325 case DIFF_STATUS_DELETED:
2326 two_paths = 0;
2327 break;
2328 default:
2329 two_paths = 0;
2330 break;
2331 }
c6744349 2332 if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
6973dcae
JH
2333 printf(":%06o %06o %s ",
2334 p->one->mode, p->two->mode,
2335 diff_unique_abbrev(p->one->sha1, abbrev));
2336 printf("%s ",
2337 diff_unique_abbrev(p->two->sha1, abbrev));
2338 }
2339 printf("%s%c%s", status, inter_name_termination, path_one);
2340 if (two_paths)
2341 printf("%c%s", inter_name_termination, path_two);
2342 putchar(line_termination);
2343 if (path_one != p->one->path)
2344 free((void*)path_one);
2345 if (path_two != p->two->path)
2346 free((void*)path_two);
2347}
2348
471efb09 2349static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
6973dcae
JH
2350{
2351 char *path = p->two->path;
2352
471efb09 2353 if (opt->line_termination)
6973dcae 2354 path = quote_one(p->two->path);
471efb09 2355 printf("%s%c", path, opt->line_termination);
6973dcae
JH
2356 if (p->two->path != path)
2357 free(path);
2358}
2359
2360int diff_unmodified_pair(struct diff_filepair *p)
2361{
2362 /* This function is written stricter than necessary to support
2363 * the currently implemented transformers, but the idea is to
2364 * let transformers to produce diff_filepairs any way they want,
2365 * and filter and clean them up here before producing the output.
2366 */
2367 struct diff_filespec *one, *two;
2368
2369 if (DIFF_PAIR_UNMERGED(p))
2370 return 0; /* unmerged is interesting */
2371
2372 one = p->one;
2373 two = p->two;
2374
2375 /* deletion, addition, mode or type change
2376 * and rename are all interesting.
2377 */
2378 if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
2379 DIFF_PAIR_MODE_CHANGED(p) ||
2380 strcmp(one->path, two->path))
2381 return 0;
2382
2383 /* both are valid and point at the same path. that is, we are
2384 * dealing with a change.
2385 */
2386 if (one->sha1_valid && two->sha1_valid &&
a89fccd2 2387 !hashcmp(one->sha1, two->sha1))
6973dcae
JH
2388 return 1; /* no change */
2389 if (!one->sha1_valid && !two->sha1_valid)
2390 return 1; /* both look at the same file on the filesystem. */
2391 return 0;
2392}
2393
2394static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
2395{
2396 if (diff_unmodified_pair(p))
2397 return;
2398
2399 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2400 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2401 return; /* no tree diffs in patch format */
2402
2403 run_diff(p, o);
2404}
2405
2406static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
2407 struct diffstat_t *diffstat)
2408{
2409 if (diff_unmodified_pair(p))
2410 return;
2411
2412 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2413 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2414 return; /* no tree diffs in patch format */
2415
2416 run_diffstat(p, o, diffstat);
2417}
2418
88246898
JS
2419static void diff_flush_checkdiff(struct diff_filepair *p,
2420 struct diff_options *o)
2421{
2422 if (diff_unmodified_pair(p))
2423 return;
2424
2425 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2426 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2427 return; /* no tree diffs in patch format */
2428
2429 run_checkdiff(p, o);
2430}
2431
6973dcae
JH
2432int diff_queue_is_empty(void)
2433{
2434 struct diff_queue_struct *q = &diff_queued_diff;
2435 int i;
2436 for (i = 0; i < q->nr; i++)
2437 if (!diff_unmodified_pair(q->queue[i]))
2438 return 0;
2439 return 1;
2440}
2441
2442#if DIFF_DEBUG
2443void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
2444{
2445 fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
2446 x, one ? one : "",
2447 s->path,
2448 DIFF_FILE_VALID(s) ? "valid" : "invalid",
2449 s->mode,
2450 s->sha1_valid ? sha1_to_hex(s->sha1) : "");
2451 fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
2452 x, one ? one : "",
2453 s->size, s->xfrm_flags);
2454}
2455
2456void diff_debug_filepair(const struct diff_filepair *p, int i)
2457{
2458 diff_debug_filespec(p->one, i, "one");
2459 diff_debug_filespec(p->two, i, "two");
2460 fprintf(stderr, "score %d, status %c stays %d broken %d\n",
2461 p->score, p->status ? p->status : '?',
2462 p->source_stays, p->broken_pair);
2463}
2464
2465void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
2466{
2467 int i;
2468 if (msg)
2469 fprintf(stderr, "%s\n", msg);
2470 fprintf(stderr, "q->nr = %d\n", q->nr);
2471 for (i = 0; i < q->nr; i++) {
2472 struct diff_filepair *p = q->queue[i];
2473 diff_debug_filepair(p, i);
2474 }
2475}
2476#endif
2477
2478static void diff_resolve_rename_copy(void)
2479{
2480 int i, j;
2481 struct diff_filepair *p, *pp;
2482 struct diff_queue_struct *q = &diff_queued_diff;
2483
2484 diff_debug_queue("resolve-rename-copy", q);
2485
2486 for (i = 0; i < q->nr; i++) {
2487 p = q->queue[i];
2488 p->status = 0; /* undecided */
2489 if (DIFF_PAIR_UNMERGED(p))
2490 p->status = DIFF_STATUS_UNMERGED;
2491 else if (!DIFF_FILE_VALID(p->one))
2492 p->status = DIFF_STATUS_ADDED;
2493 else if (!DIFF_FILE_VALID(p->two))
2494 p->status = DIFF_STATUS_DELETED;
2495 else if (DIFF_PAIR_TYPE_CHANGED(p))
2496 p->status = DIFF_STATUS_TYPE_CHANGED;
2497
2498 /* from this point on, we are dealing with a pair
2499 * whose both sides are valid and of the same type, i.e.
2500 * either in-place edit or rename/copy edit.
2501 */
2502 else if (DIFF_PAIR_RENAME(p)) {
2503 if (p->source_stays) {
2504 p->status = DIFF_STATUS_COPIED;
2505 continue;
2506 }
2507 /* See if there is some other filepair that
2508 * copies from the same source as us. If so
2509 * we are a copy. Otherwise we are either a
2510 * copy if the path stays, or a rename if it
2511 * does not, but we already handled "stays" case.
2512 */
2513 for (j = i + 1; j < q->nr; j++) {
2514 pp = q->queue[j];
2515 if (strcmp(pp->one->path, p->one->path))
2516 continue; /* not us */
2517 if (!DIFF_PAIR_RENAME(pp))
2518 continue; /* not a rename/copy */
2519 /* pp is a rename/copy from the same source */
2520 p->status = DIFF_STATUS_COPIED;
2521 break;
2522 }
2523 if (!p->status)
2524 p->status = DIFF_STATUS_RENAMED;
2525 }
a89fccd2 2526 else if (hashcmp(p->one->sha1, p->two->sha1) ||
d516c2d1
JS
2527 p->one->mode != p->two->mode ||
2528 is_null_sha1(p->one->sha1))
6973dcae
JH
2529 p->status = DIFF_STATUS_MODIFIED;
2530 else {
2531 /* This is a "no-change" entry and should not
2532 * happen anymore, but prepare for broken callers.
2533 */
2534 error("feeding unmodified %s to diffcore",
2535 p->one->path);
2536 p->status = DIFF_STATUS_UNKNOWN;
2537 }
2538 }
2539 diff_debug_queue("resolve-rename-copy done", q);
2540}
2541
c6744349 2542static int check_pair_status(struct diff_filepair *p)
6973dcae 2543{
6973dcae
JH
2544 switch (p->status) {
2545 case DIFF_STATUS_UNKNOWN:
c6744349 2546 return 0;
6973dcae
JH
2547 case 0:
2548 die("internal error in diff-resolve-rename-copy");
6973dcae 2549 default:
c6744349 2550 return 1;
6973dcae
JH
2551 }
2552}
2553
c6744349
TH
2554static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
2555{
2556 int fmt = opt->output_format;
2557
2558 if (fmt & DIFF_FORMAT_CHECKDIFF)
2559 diff_flush_checkdiff(p, opt);
2560 else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
2561 diff_flush_raw(p, opt);
2562 else if (fmt & DIFF_FORMAT_NAME)
471efb09 2563 diff_flush_name(p, opt);
c6744349
TH
2564}
2565
4bbd261b
SE
2566static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
2567{
0d26a64e 2568 char *name = quote_one(fs->path);
4bbd261b 2569 if (fs->mode)
0d26a64e 2570 printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
4bbd261b 2571 else
0d26a64e
AJ
2572 printf(" %s %s\n", newdelete, name);
2573 free(name);
4bbd261b
SE
2574}
2575
2576
2577static void show_mode_change(struct diff_filepair *p, int show_name)
2578{
2579 if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
0d26a64e
AJ
2580 if (show_name) {
2581 char *name = quote_one(p->two->path);
4bbd261b 2582 printf(" mode change %06o => %06o %s\n",
0d26a64e
AJ
2583 p->one->mode, p->two->mode, name);
2584 free(name);
2585 }
4bbd261b
SE
2586 else
2587 printf(" mode change %06o => %06o\n",
2588 p->one->mode, p->two->mode);
2589 }
2590}
2591
2592static void show_rename_copy(const char *renamecopy, struct diff_filepair *p)
2593{
b9f44164 2594 char *names = pprint_rename(p->one->path, p->two->path);
4bbd261b 2595
b9f44164
AJ
2596 printf(" %s %s (%d%%)\n", renamecopy, names,
2597 (int)(0.5 + p->score * 100.0/MAX_SCORE));
2598 free(names);
4bbd261b
SE
2599 show_mode_change(p, 0);
2600}
2601
2602static void diff_summary(struct diff_filepair *p)
2603{
2604 switch(p->status) {
2605 case DIFF_STATUS_DELETED:
2606 show_file_mode_name("delete", p->one);
2607 break;
2608 case DIFF_STATUS_ADDED:
2609 show_file_mode_name("create", p->two);
2610 break;
2611 case DIFF_STATUS_COPIED:
2612 show_rename_copy("copy", p);
2613 break;
2614 case DIFF_STATUS_RENAMED:
2615 show_rename_copy("rename", p);
2616 break;
2617 default:
2618 if (p->score) {
0d26a64e
AJ
2619 char *name = quote_one(p->two->path);
2620 printf(" rewrite %s (%d%%)\n", name,
4bbd261b 2621 (int)(0.5 + p->score * 100.0/MAX_SCORE));
0d26a64e 2622 free(name);
4bbd261b
SE
2623 show_mode_change(p, 0);
2624 } else show_mode_change(p, 1);
2625 break;
2626 }
2627}
2628
fcb3d0ad
JS
2629struct patch_id_t {
2630 struct xdiff_emit_state xm;
2631 SHA_CTX *ctx;
2632 int patchlen;
2633};
2634
2635static int remove_space(char *line, int len)
2636{
2637 int i;
2638 char *dst = line;
2639 unsigned char c;
2640
2641 for (i = 0; i < len; i++)
2642 if (!isspace((c = line[i])))
2643 *dst++ = c;
2644
2645 return dst - line;
2646}
2647
2648static void patch_id_consume(void *priv, char *line, unsigned long len)
2649{
2650 struct patch_id_t *data = priv;
2651 int new_len;
2652
2653 /* Ignore line numbers when computing the SHA1 of the patch */
cc44c765 2654 if (!prefixcmp(line, "@@ -"))
fcb3d0ad
JS
2655 return;
2656
2657 new_len = remove_space(line, len);
2658
2659 SHA1_Update(data->ctx, line, new_len);
2660 data->patchlen += new_len;
2661}
2662
2663/* returns 0 upon success, and writes result into sha1 */
2664static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
2665{
2666 struct diff_queue_struct *q = &diff_queued_diff;
2667 int i;
2668 SHA_CTX ctx;
2669 struct patch_id_t data;
2670 char buffer[PATH_MAX * 4 + 20];
2671
2672 SHA1_Init(&ctx);
2673 memset(&data, 0, sizeof(struct patch_id_t));
2674 data.ctx = &ctx;
2675 data.xm.consume = patch_id_consume;
2676
2677 for (i = 0; i < q->nr; i++) {
2678 xpparam_t xpp;
2679 xdemitconf_t xecfg;
2680 xdemitcb_t ecb;
2681 mmfile_t mf1, mf2;
2682 struct diff_filepair *p = q->queue[i];
2683 int len1, len2;
2684
2685 if (p->status == 0)
2686 return error("internal diff status error");
2687 if (p->status == DIFF_STATUS_UNKNOWN)
2688 continue;
2689 if (diff_unmodified_pair(p))
2690 continue;
2691 if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
2692 (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
2693 continue;
2694 if (DIFF_PAIR_UNMERGED(p))
2695 continue;
2696
2697 diff_fill_sha1_info(p->one);
2698 diff_fill_sha1_info(p->two);
2699 if (fill_mmfile(&mf1, p->one) < 0 ||
2700 fill_mmfile(&mf2, p->two) < 0)
2701 return error("unable to read files to diff");
2702
2703 /* Maybe hash p->two? into the patch id? */
2704 if (mmfile_is_binary(&mf2))
2705 continue;
2706
2707 len1 = remove_space(p->one->path, strlen(p->one->path));
2708 len2 = remove_space(p->two->path, strlen(p->two->path));
2709 if (p->one->mode == 0)
2710 len1 = snprintf(buffer, sizeof(buffer),
2711 "diff--gita/%.*sb/%.*s"
2712 "newfilemode%06o"
2713 "---/dev/null"
2714 "+++b/%.*s",
2715 len1, p->one->path,
2716 len2, p->two->path,
2717 p->two->mode,
2718 len2, p->two->path);
2719 else if (p->two->mode == 0)
2720 len1 = snprintf(buffer, sizeof(buffer),
2721 "diff--gita/%.*sb/%.*s"
2722 "deletedfilemode%06o"
2723 "---a/%.*s"
2724 "+++/dev/null",
2725 len1, p->one->path,
2726 len2, p->two->path,
2727 p->one->mode,
2728 len1, p->one->path);
2729 else
2730 len1 = snprintf(buffer, sizeof(buffer),
2731 "diff--gita/%.*sb/%.*s"
2732 "---a/%.*s"
2733 "+++b/%.*s",
2734 len1, p->one->path,
2735 len2, p->two->path,
2736 len1, p->one->path,
2737 len2, p->two->path);
2738 SHA1_Update(&ctx, buffer, len1);
2739
2740 xpp.flags = XDF_NEED_MINIMAL;
2741 xecfg.ctxlen = 3;
9fdc3bb5 2742 xecfg.flags = XDL_EMIT_FUNCNAMES;
fcb3d0ad
JS
2743 ecb.outf = xdiff_outf;
2744 ecb.priv = &data;
2745 xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
2746 }
2747
2748 SHA1_Final(sha1, &ctx);
2749 return 0;
2750}
2751
2752int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
2753{
2754 struct diff_queue_struct *q = &diff_queued_diff;
2755 int i;
2756 int result = diff_get_patch_id(options, sha1);
2757
2758 for (i = 0; i < q->nr; i++)
2759 diff_free_filepair(q->queue[i]);
2760
2761 free(q->queue);
2762 q->queue = NULL;
2763 q->nr = q->alloc = 0;
2764
2765 return result;
2766}
2767
946c3784 2768static int is_summary_empty(const struct diff_queue_struct *q)
6973dcae 2769{
6973dcae 2770 int i;
6973dcae 2771
946c3784
TH
2772 for (i = 0; i < q->nr; i++) {
2773 const struct diff_filepair *p = q->queue[i];
2774
2775 switch (p->status) {
2776 case DIFF_STATUS_DELETED:
2777 case DIFF_STATUS_ADDED:
2778 case DIFF_STATUS_COPIED:
2779 case DIFF_STATUS_RENAMED:
2780 return 0;
2781 default:
2782 if (p->score)
2783 return 0;
2784 if (p->one->mode && p->two->mode &&
2785 p->one->mode != p->two->mode)
2786 return 0;
2787 break;
2788 }
6973dcae 2789 }
946c3784
TH
2790 return 1;
2791}
2792
6973dcae
JH
2793void diff_flush(struct diff_options *options)
2794{
2795 struct diff_queue_struct *q = &diff_queued_diff;
c6744349 2796 int i, output_format = options->output_format;
946c3784 2797 int separator = 0;
6973dcae 2798
c6744349
TH
2799 /*
2800 * Order: raw, stat, summary, patch
2801 * or: name/name-status/checkdiff (other bits clear)
2802 */
946c3784
TH
2803 if (!q->nr)
2804 goto free_queue;
6973dcae 2805
c6744349
TH
2806 if (output_format & (DIFF_FORMAT_RAW |
2807 DIFF_FORMAT_NAME |
2808 DIFF_FORMAT_NAME_STATUS |
2809 DIFF_FORMAT_CHECKDIFF)) {
6973dcae
JH
2810 for (i = 0; i < q->nr; i++) {
2811 struct diff_filepair *p = q->queue[i];
c6744349
TH
2812 if (check_pair_status(p))
2813 flush_one_pair(p, options);
6973dcae 2814 }
946c3784 2815 separator++;
6973dcae 2816 }
c6744349 2817
ebd124c6 2818 if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
5e2b0636 2819 struct diffstat_t diffstat;
c6744349 2820
5e2b0636
TH
2821 memset(&diffstat, 0, sizeof(struct diffstat_t));
2822 diffstat.xm.consume = diffstat_consume;
6973dcae
JH
2823 for (i = 0; i < q->nr; i++) {
2824 struct diff_filepair *p = q->queue[i];
c6744349 2825 if (check_pair_status(p))
5e2b0636 2826 diff_flush_stat(p, options, &diffstat);
6973dcae 2827 }
74e2abe5
JH
2828 if (output_format & DIFF_FORMAT_NUMSTAT)
2829 show_numstat(&diffstat, options);
2830 if (output_format & DIFF_FORMAT_DIFFSTAT)
2831 show_stats(&diffstat, options);
ebd124c6
NP
2832 else if (output_format & DIFF_FORMAT_SHORTSTAT)
2833 show_shortstats(&diffstat);
3969cf7d 2834 separator++;
6973dcae
JH
2835 }
2836
946c3784 2837 if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
c6744349
TH
2838 for (i = 0; i < q->nr; i++)
2839 diff_summary(q->queue[i]);
3969cf7d 2840 separator++;
6973dcae
JH
2841 }
2842
c6744349 2843 if (output_format & DIFF_FORMAT_PATCH) {
946c3784
TH
2844 if (separator) {
2845 if (options->stat_sep) {
2846 /* attach patch instead of inline */
c6744349 2847 fputs(options->stat_sep, stdout);
946c3784 2848 } else {
c6744349 2849 putchar(options->line_termination);
946c3784 2850 }
c6744349
TH
2851 }
2852
2853 for (i = 0; i < q->nr; i++) {
2854 struct diff_filepair *p = q->queue[i];
2855 if (check_pair_status(p))
2856 diff_flush_patch(p, options);
2857 }
4bbd261b
SE
2858 }
2859
04245581
JK
2860 if (output_format & DIFF_FORMAT_CALLBACK)
2861 options->format_callback(q, options, options->format_callback_data);
2862
c6744349
TH
2863 for (i = 0; i < q->nr; i++)
2864 diff_free_filepair(q->queue[i]);
946c3784 2865free_queue:
6973dcae
JH
2866 free(q->queue);
2867 q->queue = NULL;
2868 q->nr = q->alloc = 0;
2869}
2870
2871static void diffcore_apply_filter(const char *filter)
2872{
2873 int i;
2874 struct diff_queue_struct *q = &diff_queued_diff;
2875 struct diff_queue_struct outq;
2876 outq.queue = NULL;
2877 outq.nr = outq.alloc = 0;
2878
2879 if (!filter)
2880 return;
2881
2882 if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
2883 int found;
2884 for (i = found = 0; !found && i < q->nr; i++) {
2885 struct diff_filepair *p = q->queue[i];
2886 if (((p->status == DIFF_STATUS_MODIFIED) &&
2887 ((p->score &&
2888 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2889 (!p->score &&
2890 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2891 ((p->status != DIFF_STATUS_MODIFIED) &&
2892 strchr(filter, p->status)))
2893 found++;
2894 }
2895 if (found)
2896 return;
2897
2898 /* otherwise we will clear the whole queue
2899 * by copying the empty outq at the end of this
2900 * function, but first clear the current entries
2901 * in the queue.
2902 */
2903 for (i = 0; i < q->nr; i++)
2904 diff_free_filepair(q->queue[i]);
2905 }
2906 else {
2907 /* Only the matching ones */
2908 for (i = 0; i < q->nr; i++) {
2909 struct diff_filepair *p = q->queue[i];
2910
2911 if (((p->status == DIFF_STATUS_MODIFIED) &&
2912 ((p->score &&
2913 strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
2914 (!p->score &&
2915 strchr(filter, DIFF_STATUS_MODIFIED)))) ||
2916 ((p->status != DIFF_STATUS_MODIFIED) &&
2917 strchr(filter, p->status)))
2918 diff_q(&outq, p);
2919 else
2920 diff_free_filepair(p);
2921 }
2922 }
2923 free(q->queue);
2924 *q = outq;
2925}
2926
2927void diffcore_std(struct diff_options *options)
2928{
68aacb2f
JH
2929 if (options->quiet)
2930 return;
6973dcae
JH
2931 if (options->break_opt != -1)
2932 diffcore_break(options->break_opt);
2933 if (options->detect_rename)
2934 diffcore_rename(options);
2935 if (options->break_opt != -1)
2936 diffcore_merge_broken();
2937 if (options->pickaxe)
2938 diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
2939 if (options->orderfile)
2940 diffcore_order(options->orderfile);
2941 diff_resolve_rename_copy();
2942 diffcore_apply_filter(options->filter);
68aacb2f
JH
2943
2944 options->has_changes = !!diff_queued_diff.nr;
6973dcae
JH
2945}
2946
2947
6973dcae
JH
2948void diff_addremove(struct diff_options *options,
2949 int addremove, unsigned mode,
2950 const unsigned char *sha1,
2951 const char *base, const char *path)
2952{
2953 char concatpath[PATH_MAX];
2954 struct diff_filespec *one, *two;
2955
2956 /* This may look odd, but it is a preparation for
2957 * feeding "there are unchanged files which should
2958 * not produce diffs, but when you are doing copy
2959 * detection you would need them, so here they are"
2960 * entries to the diff-core. They will be prefixed
2961 * with something like '=' or '*' (I haven't decided
2962 * which but should not make any difference).
2963 * Feeding the same new and old to diff_change()
2964 * also has the same effect.
2965 * Before the final output happens, they are pruned after
2966 * merged into rename/copy pairs as appropriate.
2967 */
2968 if (options->reverse_diff)
2969 addremove = (addremove == '+' ? '-' :
2970 addremove == '-' ? '+' : addremove);
2971
2972 if (!path) path = "";
2973 sprintf(concatpath, "%s%s", base, path);
2974 one = alloc_filespec(concatpath);
2975 two = alloc_filespec(concatpath);
2976
2977 if (addremove != '+')
2978 fill_filespec(one, sha1, mode);
2979 if (addremove != '-')
2980 fill_filespec(two, sha1, mode);
2981
2982 diff_queue(&diff_queued_diff, one, two);
68aacb2f 2983 options->has_changes = 1;
6973dcae
JH
2984}
2985
2986void diff_change(struct diff_options *options,
2987 unsigned old_mode, unsigned new_mode,
2988 const unsigned char *old_sha1,
2989 const unsigned char *new_sha1,
2990 const char *base, const char *path)
2991{
2992 char concatpath[PATH_MAX];
2993 struct diff_filespec *one, *two;
2994
2995 if (options->reverse_diff) {
2996 unsigned tmp;
2997 const unsigned char *tmp_c;
2998 tmp = old_mode; old_mode = new_mode; new_mode = tmp;
2999 tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
3000 }
3001 if (!path) path = "";
3002 sprintf(concatpath, "%s%s", base, path);
3003 one = alloc_filespec(concatpath);
3004 two = alloc_filespec(concatpath);
3005 fill_filespec(one, old_sha1, old_mode);
3006 fill_filespec(two, new_sha1, new_mode);
3007
3008 diff_queue(&diff_queued_diff, one, two);
68aacb2f 3009 options->has_changes = 1;
6973dcae
JH
3010}
3011
3012void diff_unmerge(struct diff_options *options,
e9c84099
JH
3013 const char *path,
3014 unsigned mode, const unsigned char *sha1)
6973dcae
JH
3015{
3016 struct diff_filespec *one, *two;
3017 one = alloc_filespec(path);
3018 two = alloc_filespec(path);
e9c84099
JH
3019 fill_filespec(one, sha1, mode);
3020 diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
6973dcae 3021}