1 /* $OpenBSD: diff3.c,v 1.41 2016/10/18 21:06:52 millert Exp $ */
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41 * modification, are permitted provided that the following conditions
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64 * @(#)diff3.c 8.1 (Berkeley) 6/6/93
68 #include <sys/queue.h>
80 #include "got_error.h"
81 #include "got_opentemp.h"
82 #include "got_object.h"
87 #include "got_lib_diff.h"
90 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
93 /* diff3 - 3-way differential file comparison */
95 /* diff3 [-ex3EX] d13 d23 f1 f2 f3 [m1 m3]
97 * d13 = diff report on f1 vs f3
98 * d23 = diff report on f2 vs f3
99 * f1, f2, f3 the 3 files
100 * if changes in f1 overlap with changes in f3, m1 and m3 are used
101 * to mark the overlaps; otherwise, the file names f1 and f3 are used
102 * (only for options E and X).
106 * "from" is first in range of changed lines; "to" is last+1
107 * from=to=line after point of insertion for added lines.
120 struct line_range old;
121 struct line_range new;
122 struct off_range oldo;
123 struct off_range newo;
133 * "de" is used to gather editing scripts. These are later spewed out
134 * in reverse order. Its first element must be all zero, the "new"
135 * component of "de" contains line positions, and "oldo" and "newo"
136 * components contain byte positions.
137 * Array overlap indicates which sections in "de" correspond to lines
138 * that are different in all three files.
144 int cline[3]; /* # of the last-read line in each file (0-2) */
147 * the latest known correspondence between line numbers of the 3 files
148 * is stored in last[1-3];
151 char f1mark[PATH_MAX];
152 char f2mark[PATH_MAX];
153 char f3mark[PATH_MAX];
161 static const struct got_error *duplicate(int *, int, struct line_range *,
162 struct line_range *, struct diff3_state *);
163 static const struct got_error *edit(struct diff *, int, int *,
164 struct diff3_state *);
165 static const struct got_error *getchange(char **, FILE *, struct diff3_state *);
166 static const struct got_error *get_line(char **, FILE *, size_t *,
167 struct diff3_state *);
168 static int number(char **);
169 static const struct got_error *readin(size_t *, char *, struct diff **,
170 struct diff3_state *);
171 static int ed_patch_lines(struct rcs_lines *, struct rcs_lines *);
172 static const struct got_error *skip(size_t *, int, int, struct diff3_state *);
173 static const struct got_error *edscript(int, struct diff3_state *);
174 static const struct got_error *merge(size_t, size_t, struct diff3_state *);
175 static const struct got_error *prange(struct line_range *,
176 struct diff3_state *);
177 static const struct got_error *repos(int, struct diff3_state *);
178 static const struct got_error *increase(struct diff3_state *);
179 static const struct got_error *diff3_internal(char *, char *, char *,
180 char *, char *, const char *, const char *, struct diff3_state *,
181 const char *, const char *, const char *);
183 static const struct got_error *
184 diff_output(BUF *diffbuf, const char *fmt, ...)
186 const struct got_error *err = NULL;
193 i = vasprintf(&str, fmt, vap);
196 return got_error_from_errno("vasprintf");
197 err = buf_append(&newsize, diffbuf, str, strlen(str));
202 static const struct got_error*
203 diffreg(BUF **d, const char *path1, const char *path2,
204 enum got_diff_algorithm diff_algo)
206 const struct got_error *err = NULL;
207 FILE *f1 = NULL, *f2 = NULL, *outfile = NULL;
208 char *outpath = NULL;
209 struct got_diffreg_result *diffreg_result = NULL;
213 f1 = fopen(path1, "re");
215 err = got_error_from_errno2("fopen", path1);
218 f2 = fopen(path2, "re");
220 err = got_error_from_errno2("fopen", path2);
224 err = got_opentemp_named(&outpath, &outfile,
225 GOT_TMPDIR_STR "/got-diffreg", "");
229 err = got_diffreg(&diffreg_result, f1, f2, diff_algo, 0, 0);
233 if (diffreg_result) {
234 struct diff_result *diff_result = diffreg_result->result;
235 int atomizer_flags = (diff_result->left->atomizer_flags |
236 diff_result->right->atomizer_flags);
237 if ((atomizer_flags & DIFF_ATOMIZER_FOUND_BINARY_DATA)) {
238 err = got_error(GOT_ERR_FILE_BINARY);
243 err = got_diffreg_output(NULL, NULL, diffreg_result, 1, 1, "", "",
244 GOT_DIFF_OUTPUT_PLAIN, 0, outfile);
248 if (fflush(outfile) != 0) {
249 err = got_error_from_errno2("fflush", outpath);
252 if (fseek(outfile, 0L, SEEK_SET) == -1) {
253 err = got_ferror(outfile, GOT_ERR_IO);
257 err = buf_load(d, outfile);
260 if (unlink(outpath) == -1 && err == NULL)
261 err = got_error_from_errno2("unlink", outpath);
264 if (outfile && fclose(outfile) == EOF && err == NULL)
265 err = got_error_from_errno("fclose");
266 if (f1 && fclose(f1) == EOF && err == NULL)
267 err = got_error_from_errno("fclose");
268 if (f2 && fclose(f2) == EOF && err == NULL)
269 err = got_error_from_errno("fclose");
276 const struct got_error *
277 got_merge_diff3(int *overlapcnt, int outfd, FILE *f1, FILE *f2,
278 FILE *f3, const char *label1, const char *label2, const char *label3,
279 enum got_diff_algorithm diff_algo)
281 const struct got_error *err = NULL;
282 char *dp13, *dp23, *path1, *path2, *path3;
283 BUF *b1, *b2, *b3, *d1, *d2, *diffb;
284 u_char *data, *patch;
285 size_t dlen, plen, i;
286 struct diff3_state *d3s;
290 d3s = calloc(1, sizeof(*d3s));
292 return got_error_from_errno("calloc");
294 b1 = b2 = b3 = d1 = d2 = diffb = NULL;
295 dp13 = dp23 = path1 = path2 = path3 = NULL;
298 err = buf_load(&b1, f1);
301 err = buf_load(&b2, f2);
304 err = buf_load(&b3, f3);
308 err = buf_alloc(&diffb, 128);
312 if (asprintf(&path1, GOT_TMPDIR_STR "/got-diff1.XXXXXXXX") == -1) {
313 err = got_error_from_errno("asprintf");
316 if (asprintf(&path2, GOT_TMPDIR_STR "/got-diff2.XXXXXXXX") == -1) {
317 err = got_error_from_errno("asprintf");
320 if (asprintf(&path3, GOT_TMPDIR_STR "/got-diff3.XXXXXXXX") == -1) {
321 err = got_error_from_errno("asprintf");
325 err = buf_write_stmp(b1, path1);
328 err = buf_write_stmp(b2, path2);
331 err = buf_write_stmp(b3, path3);
338 err = diffreg(&d1, path1, path3, diff_algo);
345 err = diffreg(&d2, path2, path3, diff_algo);
352 if (asprintf(&dp13, GOT_TMPDIR_STR "/got-d13.XXXXXXXXXX") == -1) {
353 err = got_error_from_errno("asprintf");
356 err = buf_write_stmp(d1, dp13);
363 if (asprintf(&dp23, GOT_TMPDIR_STR "/got-d23.XXXXXXXXXX") == -1) {
364 err = got_error_from_errno("asprintf");
367 err = buf_write_stmp(d2, dp23);
374 d3s->diffbuf = diffb;
375 err = diff3_internal(dp13, dp23, path1, path2, path3,
376 label1, label3, d3s, label1, label2, label3);
383 plen = buf_len(diffb);
384 patch = buf_release(diffb);
386 data = buf_release(b1);
388 diffb = rcs_patchfile(data, dlen, patch, plen, ed_patch_lines);
395 if (unlink(path1) == -1 && err == NULL)
396 err = got_error_from_errno2("unlink", path1);
397 if (unlink(path2) == -1 && err == NULL)
398 err = got_error_from_errno2("unlink", path2);
399 if (unlink(path3) == -1 && err == NULL)
400 err = got_error_from_errno2("unlink", path3);
401 if (unlink(dp13) == -1 && err == NULL)
402 err = got_error_from_errno2("unlink", dp13);
403 if (unlink(dp23) == -1 && err == NULL)
404 err = got_error_from_errno2("unlink", dp23);
414 for (i = 0; i < nitems(d3s->fp); i++) {
415 if (d3s->fp[i] && fclose(d3s->fp[i]) == EOF && err == NULL)
416 err = got_error_from_errno("fclose");
418 if (err == NULL && diffb) {
419 if (buf_write_fd(diffb, outfd) < 0)
420 err = got_error_from_errno("buf_write_fd");
421 *overlapcnt = d3s->overlapcnt;
428 static const struct got_error *
429 diff3_internal(char *dp13, char *dp23, char *path1, char *path2, char *path3,
430 const char *fmark, const char *rmark, struct diff3_state *d3s,
431 const char *label1, const char *label2, const char *label3)
433 const struct got_error *err = NULL;
437 i = snprintf(d3s->f1mark, sizeof(d3s->f1mark),
438 "%s%s%s", GOT_DIFF_CONFLICT_MARKER_BEGIN,
439 label1 ? " " : "", label1 ? label1 : "");
440 if (i < 0 || i >= (int)sizeof(d3s->f1mark))
441 return got_error(GOT_ERR_NO_SPACE);
443 i = snprintf(d3s->f2mark, sizeof(d3s->f2mark),
444 "%s%s%s", GOT_DIFF_CONFLICT_MARKER_ORIG,
445 label2 ? " " : "", label2 ? label2 : "");
446 if (i < 0 || i >= (int)sizeof(d3s->f2mark))
447 return got_error(GOT_ERR_NO_SPACE);
449 i = snprintf(d3s->f3mark, sizeof(d3s->f3mark),
450 "%s%s%s", GOT_DIFF_CONFLICT_MARKER_END,
451 label3 ? " " : "", label3 ? label3 : "");
452 if (i < 0 || i >= (int)sizeof(d3s->f3mark))
453 return got_error(GOT_ERR_NO_SPACE);
459 err = readin(&m, dp13, &d3s->d13, d3s);
462 err = readin(&n, dp23, &d3s->d23, d3s);
466 if ((d3s->fp[0] = fopen(path1, "re")) == NULL)
467 return got_error_from_errno2("fopen", path1);
468 if ((d3s->fp[1] = fopen(path2, "re")) == NULL)
469 return got_error_from_errno2("fopen", path2);
470 if ((d3s->fp[2] = fopen(path3, "re")) == NULL)
471 return got_error_from_errno2("fopen", path3);
473 return merge(m, n, d3s);
477 ed_patch_lines(struct rcs_lines *dlines, struct rcs_lines *plines)
480 struct rcs_line *sort, *lp, *dlp, *ndlp, *insert_after;
481 int start, end, i, lineno;
484 dlp = TAILQ_FIRST(&(dlines->l_lines));
485 lp = TAILQ_FIRST(&(plines->l_lines));
488 for (lp = TAILQ_NEXT(lp, l_list); lp != NULL;
489 lp = TAILQ_NEXT(lp, l_list)) {
490 /* Skip blank lines */
494 /* NUL-terminate line buffer for strtol() safety. */
495 tmp = lp->l_line[lp->l_len - 1];
496 lp->l_line[lp->l_len - 1] = '\0';
498 /* len - 1 is NUL terminator so we use len - 2 for 'op' */
499 op = lp->l_line[lp->l_len - 2];
500 start = (int)strtol(lp->l_line, &ep, 10);
502 /* Restore the last byte of the buffer */
503 lp->l_line[lp->l_len - 1] = tmp;
506 if (start > dlines->l_nblines ||
507 start < 0 || *ep != 'a')
509 } else if (op == 'c') {
510 if (start > dlines->l_nblines ||
511 start < 0 || (*ep != ',' && *ep != 'c'))
516 end = (int)strtol(ep, &ep, 10);
517 if (end < 0 || *ep != 'c')
528 if (dlp->l_lineno == start)
530 if (dlp->l_lineno > start) {
531 dlp = TAILQ_PREV(dlp, tqh, l_list);
532 } else if (dlp->l_lineno < start) {
533 ndlp = TAILQ_NEXT(dlp, l_list);
534 if (ndlp->l_lineno > start)
545 insert_after = TAILQ_PREV(dlp, tqh, l_list);
546 for (i = 0; i <= (end - start); i++) {
547 ndlp = TAILQ_NEXT(dlp, l_list);
548 TAILQ_REMOVE(&(dlines->l_lines), dlp, l_list);
554 if (op == 'a' || op == 'c') {
557 lp = TAILQ_NEXT(lp, l_list);
561 if (lp->l_len == 2 &&
562 lp->l_line[0] == '.' &&
563 lp->l_line[1] == '\n')
566 if (lp->l_line[0] == ':') {
570 TAILQ_REMOVE(&(plines->l_lines), lp, l_list);
571 TAILQ_INSERT_AFTER(&(dlines->l_lines), dlp,
575 lp->l_lineno = start;
581 * always resort lines as the markers might be put at the
582 * same line as we first started editing.
585 TAILQ_FOREACH(sort, &(dlines->l_lines), l_list)
586 sort->l_lineno = lineno++;
587 dlines->l_nblines = lineno - 1;
594 * Pick up the line numbers of all changes from one change file.
595 * (This puts the numbers in a vector, which is not strictly necessary,
596 * since the vector is processed in one sequential pass.
597 * The vector could be optimized out of existence)
599 static const struct got_error *
600 readin(size_t *n, char *name, struct diff **dd, struct diff3_state *d3s)
602 const struct got_error *err = NULL;
610 f = fopen(name, "re");
612 return got_error_from_errno2("fopen", name);
613 err = getchange(&p, f, d3s);
616 for (i = 0; p; i++) {
617 if (i >= d3s->szchanges - 1) {
639 (*dd)[i].old.from = a;
641 (*dd)[i].new.from = c;
644 err = getchange(&p, f, d3s);
650 (*dd)[i].old.from = (*dd)[i - 1].old.to;
651 (*dd)[i].new.from = (*dd)[i - 1].new.to;
654 if (fclose(f) == EOF && err == NULL)
655 err = got_error_from_errno("fclose");
667 while (isdigit((unsigned char)(**lc)))
668 nn = nn*10 + *(*lc)++ - '0';
673 static const struct got_error *
674 getchange(char **line, FILE *b, struct diff3_state *d3s)
676 const struct got_error *err = NULL;
680 if (*line && isdigit((unsigned char)(*line)[0]))
682 err = get_line(line, b, NULL, d3s);
690 static const struct got_error *
691 get_line(char **ret, FILE *b, size_t *n, struct diff3_state *d3s)
693 const struct got_error *err = NULL;
703 len = getline(&cp, &size, b);
706 err = got_error_from_errno("getline");
710 if (cp[len - 1] != '\n') {
712 if (len + 1 > size) {
713 new = realloc(cp, len + 1);
715 err = got_error_from_errno("realloc");
725 *ret = d3s->buf = cp;
734 static const struct got_error *
735 merge(size_t m1, size_t m2, struct diff3_state *d3s)
737 const struct got_error *err = NULL;
738 struct diff *d1, *d2;
745 t1 = (d1 < d3s->d13 + m1);
746 t2 = (d2 < d3s->d23 + m2);
750 /* first file is different from others */
751 if (!t2 || (t1 && d1->new.to < d2->new.from)) {
752 /* stuff peculiar to 1st file */
757 /* second file is different from others */
758 if (!t1 || (t2 && d2->new.to < d1->new.from)) {
764 * Merge overlapping changes in first file
765 * this happens after extension (see below).
767 if (d1 + 1 < d3s->d13 + m1 && d1->new.to >= d1[1].new.from) {
768 d1[1].old.from = d1->old.from;
769 d1[1].new.from = d1->new.from;
774 /* merge overlapping changes in second */
775 if (d2 + 1 < d3s->d23 + m2 && d2->new.to >= d2[1].new.from) {
776 d2[1].old.from = d2->old.from;
777 d2[1].new.from = d2->new.from;
781 /* stuff peculiar to third file or different in all */
782 if (d1->new.from == d2->new.from && d1->new.to == d2->new.to) {
783 err = duplicate(&dpl, j, &d1->old, &d2->old, d3s);
788 * dpl = 0 means all files differ
789 * dpl = 1 means files 1 and 2 identical
791 err = edit(d1, dpl, &j, d3s);
800 * Overlapping changes from file 1 and 2; extend changes
801 * appropriately to make them coincide.
803 if (d1->new.from < d2->new.from) {
804 d2->old.from -= d2->new.from - d1->new.from;
805 d2->new.from = d1->new.from;
806 } else if (d2->new.from < d1->new.from) {
807 d1->old.from -= d1->new.from - d2->new.from;
808 d1->new.from = d2->new.from;
810 if (d1->new.to > d2->new.to) {
811 d2->old.to += d1->new.to - d2->new.to;
812 d2->new.to = d1->new.to;
813 } else if (d2->new.to > d1->new.to) {
814 d1->old.to += d2->new.to - d1->new.to;
815 d1->new.to = d2->new.to;
819 return (edscript(j, d3s));
823 * print the range of line numbers, rold.from thru rold.to, as n1,n2 or n1
825 static const struct got_error *
826 prange(struct line_range *rold, struct diff3_state *d3s)
828 const struct got_error *err = NULL;
830 if (rold->to <= rold->from) {
831 err = diff_output(d3s->diffbuf, "%da\n", rold->from - 1);
835 err = diff_output(d3s->diffbuf, "%d", rold->from);
838 if (rold->to > rold->from + 1) {
839 err = diff_output(d3s->diffbuf, ",%d", rold->to - 1);
843 err = diff_output(d3s->diffbuf, "c\n");
852 * Skip to just before line number from in file "i".
853 * Return the number of bytes skipped in *nskipped.
855 static const struct got_error *
856 skip(size_t *nskipped, int i, int from, struct diff3_state *d3s)
858 const struct got_error *err = NULL;
863 for (n = 0; d3s->cline[i] < from - 1; n += len) {
864 err = get_line(&line, d3s->fp[i], &len, d3s);
874 * Set *dpl to 1 or 0 according as the old range (in file 1) contains exactly
875 * the same data as the new range (in file 2).
877 * If this change could overlap, remember start/end offsets in file 2 so we
878 * can write out the original lines of text if a merge conflict occurs.
880 static const struct got_error *
881 duplicate(int *dpl, int j, struct line_range *r1, struct line_range *r2,
882 struct diff3_state *d3s)
884 const struct got_error *err = NULL;
893 if (r1->to - r1->from != r2->to - r2->from)
896 err = skip(&nskipped, 0, r1->from, d3s);
899 err = skip(&nskipped, 1, r2->from, d3s);
903 off = ftello(d3s->fp[1]);
905 return got_error_from_errno("ftello");
906 d3s->de[j + 1].oldo.from = off; /* original lines start here */
909 for (nline = 0; nline < r1->to - r1->from; nline++) {
911 c = getc(d3s->fp[0]);
912 d = getc(d3s->fp[1]);
913 if (c == EOF && d == EOF)
916 return got_ferror(d3s->fp[0], GOT_ERR_EOF);
918 return got_ferror(d3s->fp[1], GOT_ERR_EOF);
921 long orig_line_len = nchar;
923 d = getc(d3s->fp[1]);
928 if (orig_line_len > nchar &&
929 fseek(d3s->fp[1], -(orig_line_len - nchar),
931 return got_ferror(d3s->fp[1],
933 /* original lines end here */
934 d3s->de[j + 1].oldo.to = off + orig_line_len;
935 err = repos(nchar, d3s);
943 /* original lines end here */
944 d3s->de[j + 1].oldo.to = off + nchar;
946 err = repos(nchar, d3s);
953 static const struct got_error *
954 repos(int nchar, struct diff3_state *d3s)
958 for (i = 0; i < 2; i++) {
959 if (fseek(d3s->fp[i], (long)-nchar, SEEK_CUR) == -1)
960 return got_ferror(d3s->fp[i], GOT_ERR_IO);
967 * collect an editing script for later regurgitation
969 static const struct got_error *
970 edit(struct diff *diff, int fdup, int *j, struct diff3_state *d3s)
972 const struct got_error *err = NULL;
975 if (((fdup + 1) & 3) == 0)
978 d3s->overlap[*j] = !fdup;
981 d3s->de[*j].old.from = diff->old.from;
982 d3s->de[*j].old.to = diff->old.to;
984 err = skip(&nskipped, 2, diff->new.from, d3s);
987 d3s->de[*j].newo.from = d3s->de[*j - 1].newo.to + nskipped;
989 err = skip(&nskipped, 2, diff->new.to, d3s);
992 d3s->de[*j].newo.to = d3s->de[*j].newo.from + nskipped;
997 static const struct got_error *
998 edscript(int n, struct diff3_state *d3s)
1000 const struct got_error *err = NULL;
1003 size_t linesize = 0;
1004 ssize_t linelen = 0, k;
1006 for (; n > 0; n--) {
1007 if (!d3s->overlap[n]) {
1008 err = prange(&d3s->de[n].old, d3s);
1011 } else if (d3s->de[n].oldo.from < d3s->de[n].oldo.to) {
1012 /* Output a block of 3-way diff base file content. */
1013 err = diff_output(d3s->diffbuf, "%da\n:%s\n",
1014 d3s->de[n].old.to - 1, d3s->f2mark);
1017 if (fseeko(d3s->fp[1], d3s->de[n].oldo.from, SEEK_SET)
1019 return got_error_from_errno("fseeko");
1020 len = (d3s->de[n].oldo.to - d3s->de[n].oldo.from);
1021 for (k = 0; k < (ssize_t)len; k += linelen) {
1022 linelen = getline(&line, &linesize, d3s->fp[1]);
1023 if (linelen == -1) {
1024 if (feof(d3s->fp[1]))
1026 err = got_ferror(d3s->fp[1],
1030 err = diff_output(d3s->diffbuf, ":%s", line);
1034 err = diff_output(d3s->diffbuf, "%s%s\n",
1035 linelen > 0 && line[linelen] == '\n' ? ":" : "",
1036 GOT_DIFF_CONFLICT_MARKER_SEP);
1040 err = diff_output(d3s->diffbuf, "%da\n:%s\n",
1041 d3s->de[n].old.to -1, GOT_DIFF_CONFLICT_MARKER_SEP);
1045 if (fseeko(d3s->fp[2], d3s->de[n].newo.from, SEEK_SET)
1047 err = got_error_from_errno("fseek");
1050 len = (d3s->de[n].newo.to - d3s->de[n].newo.from);
1051 for (k = 0; k < (ssize_t)len; k += linelen) {
1052 linelen = getline(&line, &linesize, d3s->fp[2]);
1053 if (linelen == -1) {
1054 if (feof(d3s->fp[2]))
1056 err = got_ferror(d3s->fp[2], GOT_ERR_IO);
1059 err = diff_output(d3s->diffbuf, ":%s", line);
1064 if (!d3s->overlap[n]) {
1065 err = diff_output(d3s->diffbuf, ".\n");
1069 err = diff_output(d3s->diffbuf, "%s%s\n.\n",
1070 linelen > 0 && line[linelen] == '\n' ? ":" : "",
1074 err = diff_output(d3s->diffbuf, "%da\n:%s\n.\n",
1075 d3s->de[n].old.from - 1, d3s->f1mark);
1085 static const struct got_error *
1086 increase(struct diff3_state *d3s)
1092 /* are the memset(3) calls needed? */
1093 newsz = d3s->szchanges == 0 ? 64 : 2 * d3s->szchanges;
1094 incr = newsz - d3s->szchanges;
1096 d = reallocarray(d3s->d13, newsz, sizeof(*d3s->d13));
1098 return got_error_from_errno("reallocarray");
1100 memset(d3s->d13 + d3s->szchanges, 0, incr * sizeof(*d3s->d13));
1102 d = reallocarray(d3s->d23, newsz, sizeof(*d3s->d23));
1104 return got_error_from_errno("reallocarray");
1106 memset(d3s->d23 + d3s->szchanges, 0, incr * sizeof(*d3s->d23));
1108 d = reallocarray(d3s->de, newsz, sizeof(*d3s->de));
1110 return got_error_from_errno("reallocarray");
1112 memset(d3s->de + d3s->szchanges, 0, incr * sizeof(*d3s->de));
1114 s = reallocarray(d3s->overlap, newsz, sizeof(*d3s->overlap));
1116 return got_error_from_errno("reallocarray");
1118 memset(d3s->overlap + d3s->szchanges, 0, incr * sizeof(*d3s->overlap));
1119 d3s->szchanges = newsz;