1 /* $OpenBSD: diff3.c,v 1.41 2016/10/18 21:06:52 millert Exp $ */
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21 * this software without specific prior written permission.
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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>
79 #include "got_error.h"
80 #include "got_opentemp.h"
81 #include "got_object.h"
85 #include "got_lib_diff.h"
88 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
91 /* diff3 - 3-way differential file comparison */
93 /* diff3 [-ex3EX] d13 d23 f1 f2 f3 [m1 m3]
95 * d13 = diff report on f1 vs f3
96 * d23 = diff report on f2 vs f3
97 * f1, f2, f3 the 3 files
98 * if changes in f1 overlap with changes in f3, m1 and m3 are used
99 * to mark the overlaps; otherwise, the file names f1 and f3 are used
100 * (only for options E and X).
104 * "from" is first in range of changed lines; "to" is last+1
105 * from=to=line after point of insertion for added lines.
118 struct line_range old;
119 struct line_range new;
120 struct off_range oldo;
121 struct off_range newo;
131 * "de" is used to gather editing scripts. These are later spewed out
132 * in reverse order. Its first element must be all zero, the "new"
133 * component of "de" contains line positions, and "oldo" and "newo"
134 * components contain byte positions.
135 * Array overlap indicates which sections in "de" correspond to lines
136 * that are different in all three files.
142 int cline[3]; /* # of the last-read line in each file (0-2) */
145 * the latest known correspondence between line numbers of the 3 files
146 * is stored in last[1-3];
149 char f1mark[PATH_MAX];
150 char f2mark[PATH_MAX];
151 char f3mark[PATH_MAX];
159 static const struct got_error *duplicate(int *, int, struct line_range *,
160 struct line_range *, struct diff3_state *);
161 static const struct got_error *edit(struct diff *, int, int *,
162 struct diff3_state *);
163 static const struct got_error *getchange(char **, FILE *, struct diff3_state *);
164 static const struct got_error *get_line(char **, FILE *, size_t *,
165 struct diff3_state *);
166 static int number(char **);
167 static const struct got_error *readin(size_t *, char *, struct diff **,
168 struct diff3_state *);
169 static int ed_patch_lines(struct rcs_lines *, struct rcs_lines *);
170 static const struct got_error *skip(size_t *, int, int, struct diff3_state *);
171 static const struct got_error *edscript(int, struct diff3_state *);
172 static const struct got_error *merge(size_t, size_t, struct diff3_state *);
173 static const struct got_error *prange(struct line_range *,
174 struct diff3_state *);
175 static const struct got_error *repos(int, struct diff3_state *);
176 static const struct got_error *increase(struct diff3_state *);
177 static const struct got_error *diff3_internal(char *, char *, char *,
178 char *, char *, const char *, const char *, struct diff3_state *,
179 const char *, const char *, const char *);
181 static const struct got_error *
182 diff_output(BUF *diffbuf, const char *fmt, ...)
184 const struct got_error *err = NULL;
191 i = vasprintf(&str, fmt, vap);
194 return got_error_from_errno("vasprintf");
195 err = buf_append(&newsize, diffbuf, str, strlen(str));
200 static const struct got_error*
201 diffreg(BUF **d, const char *path1, const char *path2,
202 enum got_diff_algorithm diff_algo)
204 const struct got_error *err = NULL;
205 FILE *f1 = NULL, *f2 = NULL, *outfile = NULL;
206 char *outpath = NULL;
207 struct got_diffreg_result *diffreg_result = NULL;
211 f1 = fopen(path1, "re");
213 err = got_error_from_errno2("fopen", path1);
216 f2 = fopen(path2, "re");
218 err = got_error_from_errno2("fopen", path2);
222 err = got_opentemp_named(&outpath, &outfile,
223 GOT_TMPDIR_STR "/got-diffreg");
227 err = got_diffreg(&diffreg_result, f1, f2, diff_algo, 0, 0);
231 if (diffreg_result) {
232 struct diff_result *diff_result = diffreg_result->result;
233 int atomizer_flags = (diff_result->left->atomizer_flags |
234 diff_result->right->atomizer_flags);
235 if ((atomizer_flags & DIFF_ATOMIZER_FOUND_BINARY_DATA)) {
236 err = got_error(GOT_ERR_FILE_BINARY);
241 err = got_diffreg_output(NULL, NULL, diffreg_result, 1, 1, "", "",
242 GOT_DIFF_OUTPUT_EDSCRIPT, 0, outfile);
246 if (fflush(outfile) != 0) {
247 err = got_error_from_errno2("fflush", outpath);
250 if (fseek(outfile, 0L, SEEK_SET) == -1) {
251 err = got_ferror(outfile, GOT_ERR_IO);
255 err = buf_load(d, outfile);
258 if (unlink(outpath) == -1 && err == NULL)
259 err = got_error_from_errno2("unlink", outpath);
262 if (outfile && fclose(outfile) == EOF && err == NULL)
263 err = got_error_from_errno("fclose");
264 if (f1 && fclose(f1) == EOF && err == NULL)
265 err = got_error_from_errno("fclose");
266 if (f2 && fclose(f2) == EOF && err == NULL)
267 err = got_error_from_errno("fclose");
274 const struct got_error *
275 got_merge_diff3(int *overlapcnt, int outfd, FILE *f1, FILE *f2,
276 FILE *f3, const char *label1, const char *label2, const char *label3,
277 enum got_diff_algorithm diff_algo)
279 const struct got_error *err = NULL;
280 char *dp13, *dp23, *path1, *path2, *path3;
281 BUF *b1, *b2, *b3, *d1, *d2, *diffb;
282 u_char *data, *patch;
283 size_t dlen, plen, i;
284 struct diff3_state *d3s;
288 d3s = calloc(1, sizeof(*d3s));
290 return got_error_from_errno("calloc");
292 b1 = b2 = b3 = d1 = d2 = diffb = NULL;
293 dp13 = dp23 = path1 = path2 = path3 = NULL;
296 err = buf_load(&b1, f1);
299 err = buf_load(&b2, f2);
302 err = buf_load(&b3, f3);
306 err = buf_alloc(&diffb, 128);
310 if (asprintf(&path1, GOT_TMPDIR_STR "/got-diff1.XXXXXXXX") == -1) {
311 err = got_error_from_errno("asprintf");
314 if (asprintf(&path2, GOT_TMPDIR_STR "/got-diff2.XXXXXXXX") == -1) {
315 err = got_error_from_errno("asprintf");
318 if (asprintf(&path3, GOT_TMPDIR_STR "/got-diff3.XXXXXXXX") == -1) {
319 err = got_error_from_errno("asprintf");
323 err = buf_write_stmp(b1, path1);
326 err = buf_write_stmp(b2, path2);
329 err = buf_write_stmp(b3, path3);
336 err = diffreg(&d1, path1, path3, diff_algo);
343 err = diffreg(&d2, path2, path3, diff_algo);
350 if (asprintf(&dp13, GOT_TMPDIR_STR "/got-d13.XXXXXXXXXX") == -1) {
351 err = got_error_from_errno("asprintf");
354 err = buf_write_stmp(d1, dp13);
361 if (asprintf(&dp23, GOT_TMPDIR_STR "/got-d23.XXXXXXXXXX") == -1) {
362 err = got_error_from_errno("asprintf");
365 err = buf_write_stmp(d2, dp23);
372 d3s->diffbuf = diffb;
373 err = diff3_internal(dp13, dp23, path1, path2, path3,
374 label1, label3, d3s, label1, label2, label3);
381 plen = buf_len(diffb);
382 patch = buf_release(diffb);
384 data = buf_release(b1);
386 diffb = rcs_patchfile(data, dlen, patch, plen, ed_patch_lines);
393 if (unlink(path1) == -1 && err == NULL)
394 err = got_error_from_errno2("unlink", path1);
395 if (unlink(path2) == -1 && err == NULL)
396 err = got_error_from_errno2("unlink", path2);
397 if (unlink(path3) == -1 && err == NULL)
398 err = got_error_from_errno2("unlink", path3);
399 if (unlink(dp13) == -1 && err == NULL)
400 err = got_error_from_errno2("unlink", dp13);
401 if (unlink(dp23) == -1 && err == NULL)
402 err = got_error_from_errno2("unlink", dp23);
412 for (i = 0; i < nitems(d3s->fp); i++) {
413 if (d3s->fp[i] && fclose(d3s->fp[i]) == EOF && err == NULL)
414 err = got_error_from_errno("fclose");
416 if (err == NULL && diffb) {
417 if (buf_write_fd(diffb, outfd) < 0)
418 err = got_error_from_errno("buf_write_fd");
419 *overlapcnt = d3s->overlapcnt;
426 static const struct got_error *
427 diff3_internal(char *dp13, char *dp23, char *path1, char *path2, char *path3,
428 const char *fmark, const char *rmark, struct diff3_state *d3s,
429 const char *label1, const char *label2, const char *label3)
431 const struct got_error *err = NULL;
435 i = snprintf(d3s->f1mark, sizeof(d3s->f1mark),
436 "%s%s%s", GOT_DIFF_CONFLICT_MARKER_BEGIN,
437 label1 ? " " : "", label1 ? label1 : "");
438 if (i < 0 || i >= (int)sizeof(d3s->f1mark))
439 return got_error(GOT_ERR_NO_SPACE);
441 i = snprintf(d3s->f2mark, sizeof(d3s->f2mark),
442 "%s%s%s", GOT_DIFF_CONFLICT_MARKER_ORIG,
443 label2 ? " " : "", label2 ? label2 : "");
444 if (i < 0 || i >= (int)sizeof(d3s->f2mark))
445 return got_error(GOT_ERR_NO_SPACE);
447 i = snprintf(d3s->f3mark, sizeof(d3s->f3mark),
448 "%s%s%s", GOT_DIFF_CONFLICT_MARKER_END,
449 label3 ? " " : "", label3 ? label3 : "");
450 if (i < 0 || i >= (int)sizeof(d3s->f3mark))
451 return got_error(GOT_ERR_NO_SPACE);
457 err = readin(&m, dp13, &d3s->d13, d3s);
460 err = readin(&n, dp23, &d3s->d23, d3s);
464 if ((d3s->fp[0] = fopen(path1, "re")) == NULL)
465 return got_error_from_errno2("fopen", path1);
466 if ((d3s->fp[1] = fopen(path2, "re")) == NULL)
467 return got_error_from_errno2("fopen", path2);
468 if ((d3s->fp[2] = fopen(path3, "re")) == NULL)
469 return got_error_from_errno2("fopen", path3);
471 return merge(m, n, d3s);
475 ed_patch_lines(struct rcs_lines *dlines, struct rcs_lines *plines)
478 struct rcs_line *sort, *lp, *dlp, *ndlp, *insert_after;
479 int start, end, i, lineno;
482 dlp = TAILQ_FIRST(&(dlines->l_lines));
483 lp = TAILQ_FIRST(&(plines->l_lines));
486 for (lp = TAILQ_NEXT(lp, l_list); lp != NULL;
487 lp = TAILQ_NEXT(lp, l_list)) {
488 /* Skip blank lines */
492 /* NUL-terminate line buffer for strtol() safety. */
493 tmp = lp->l_line[lp->l_len - 1];
494 lp->l_line[lp->l_len - 1] = '\0';
496 /* len - 1 is NUL terminator so we use len - 2 for 'op' */
497 op = lp->l_line[lp->l_len - 2];
498 start = (int)strtol(lp->l_line, &ep, 10);
500 /* Restore the last byte of the buffer */
501 lp->l_line[lp->l_len - 1] = tmp;
504 if (start > dlines->l_nblines ||
505 start < 0 || *ep != 'a')
507 } else if (op == 'c') {
508 if (start > dlines->l_nblines ||
509 start < 0 || (*ep != ',' && *ep != 'c'))
514 end = (int)strtol(ep, &ep, 10);
515 if (end < 0 || *ep != 'c')
526 if (dlp->l_lineno == start)
528 if (dlp->l_lineno > start) {
529 dlp = TAILQ_PREV(dlp, tqh, l_list);
530 } else if (dlp->l_lineno < start) {
531 ndlp = TAILQ_NEXT(dlp, l_list);
532 if (ndlp->l_lineno > start)
543 insert_after = TAILQ_PREV(dlp, tqh, l_list);
544 for (i = 0; i <= (end - start); i++) {
545 ndlp = TAILQ_NEXT(dlp, l_list);
546 TAILQ_REMOVE(&(dlines->l_lines), dlp, l_list);
552 if (op == 'a' || op == 'c') {
555 lp = TAILQ_NEXT(lp, l_list);
559 if (lp->l_len == 2 &&
560 lp->l_line[0] == '.' &&
561 lp->l_line[1] == '\n')
564 if (lp->l_line[0] == ':') {
568 TAILQ_REMOVE(&(plines->l_lines), lp, l_list);
569 TAILQ_INSERT_AFTER(&(dlines->l_lines), dlp,
573 lp->l_lineno = start;
579 * always resort lines as the markers might be put at the
580 * same line as we first started editing.
583 TAILQ_FOREACH(sort, &(dlines->l_lines), l_list)
584 sort->l_lineno = lineno++;
585 dlines->l_nblines = lineno - 1;
592 * Pick up the line numbers of all changes from one change file.
593 * (This puts the numbers in a vector, which is not strictly necessary,
594 * since the vector is processed in one sequential pass.
595 * The vector could be optimized out of existence)
597 static const struct got_error *
598 readin(size_t *n, char *name, struct diff **dd, struct diff3_state *d3s)
600 const struct got_error *err = NULL;
608 f = fopen(name, "re");
610 return got_error_from_errno2("fopen", name);
611 err = getchange(&p, f, d3s);
614 for (i = 0; p; i++) {
615 if (i >= d3s->szchanges - 1) {
637 (*dd)[i].old.from = a;
639 (*dd)[i].new.from = c;
642 err = getchange(&p, f, d3s);
648 (*dd)[i].old.from = (*dd)[i - 1].old.to;
649 (*dd)[i].new.from = (*dd)[i - 1].new.to;
652 if (fclose(f) == EOF && err == NULL)
653 err = got_error_from_errno("fclose");
665 while (isdigit((unsigned char)(**lc)))
666 nn = nn*10 + *(*lc)++ - '0';
671 static const struct got_error *
672 getchange(char **line, FILE *b, struct diff3_state *d3s)
674 const struct got_error *err = NULL;
678 if (*line && isdigit((unsigned char)(*line)[0]))
680 err = get_line(line, b, NULL, d3s);
688 static const struct got_error *
689 get_line(char **ret, FILE *b, size_t *n, struct diff3_state *d3s)
691 const struct got_error *err = NULL;
701 len = getline(&cp, &size, b);
704 err = got_error_from_errno("getline");
708 if (cp[len - 1] != '\n') {
710 if (len + 1 > size) {
711 new = realloc(cp, len + 1);
713 err = got_error_from_errno("realloc");
723 *ret = d3s->buf = cp;
732 static const struct got_error *
733 merge(size_t m1, size_t m2, struct diff3_state *d3s)
735 const struct got_error *err = NULL;
736 struct diff *d1, *d2;
743 t1 = (d1 < d3s->d13 + m1);
744 t2 = (d2 < d3s->d23 + m2);
748 /* first file is different from others */
749 if (!t2 || (t1 && d1->new.to < d2->new.from)) {
750 /* stuff peculiar to 1st file */
755 /* second file is different from others */
756 if (!t1 || (t2 && d2->new.to < d1->new.from)) {
762 * Merge overlapping changes in first file
763 * this happens after extension (see below).
765 if (d1 + 1 < d3s->d13 + m1 && d1->new.to >= d1[1].new.from) {
766 d1[1].old.from = d1->old.from;
767 d1[1].new.from = d1->new.from;
772 /* merge overlapping changes in second */
773 if (d2 + 1 < d3s->d23 + m2 && d2->new.to >= d2[1].new.from) {
774 d2[1].old.from = d2->old.from;
775 d2[1].new.from = d2->new.from;
779 /* stuff peculiar to third file or different in all */
780 if (d1->new.from == d2->new.from && d1->new.to == d2->new.to) {
781 err = duplicate(&dpl, j, &d1->old, &d2->old, d3s);
786 * dpl = 0 means all files differ
787 * dpl = 1 means files 1 and 2 identical
789 err = edit(d1, dpl, &j, d3s);
798 * Overlapping changes from file 1 and 2; extend changes
799 * appropriately to make them coincide.
801 if (d1->new.from < d2->new.from) {
802 d2->old.from -= d2->new.from - d1->new.from;
803 d2->new.from = d1->new.from;
804 } else if (d2->new.from < d1->new.from) {
805 d1->old.from -= d1->new.from - d2->new.from;
806 d1->new.from = d2->new.from;
808 if (d1->new.to > d2->new.to) {
809 d2->old.to += d1->new.to - d2->new.to;
810 d2->new.to = d1->new.to;
811 } else if (d2->new.to > d1->new.to) {
812 d1->old.to += d2->new.to - d1->new.to;
813 d1->new.to = d2->new.to;
817 return (edscript(j, d3s));
821 * print the range of line numbers, rold.from thru rold.to, as n1,n2 or n1
823 static const struct got_error *
824 prange(struct line_range *rold, struct diff3_state *d3s)
826 const struct got_error *err = NULL;
828 if (rold->to <= rold->from) {
829 err = diff_output(d3s->diffbuf, "%da\n", rold->from - 1);
833 err = diff_output(d3s->diffbuf, "%d", rold->from);
836 if (rold->to > rold->from + 1) {
837 err = diff_output(d3s->diffbuf, ",%d", rold->to - 1);
841 err = diff_output(d3s->diffbuf, "c\n");
850 * Skip to just before line number from in file "i".
851 * Return the number of bytes skipped in *nskipped.
853 static const struct got_error *
854 skip(size_t *nskipped, int i, int from, struct diff3_state *d3s)
856 const struct got_error *err = NULL;
861 for (n = 0; d3s->cline[i] < from - 1; n += len) {
862 err = get_line(&line, d3s->fp[i], &len, d3s);
872 * Set *dpl to 1 or 0 according as the old range (in file 1) contains exactly
873 * the same data as the new range (in file 2).
875 * If this change could overlap, remember start/end offsets in file 2 so we
876 * can write out the original lines of text if a merge conflict occurs.
878 static const struct got_error *
879 duplicate(int *dpl, int j, struct line_range *r1, struct line_range *r2,
880 struct diff3_state *d3s)
882 const struct got_error *err = NULL;
891 if (r1->to - r1->from != r2->to - r2->from)
894 err = skip(&nskipped, 0, r1->from, d3s);
897 err = skip(&nskipped, 1, r2->from, d3s);
901 off = ftello(d3s->fp[1]);
903 return got_error_from_errno("ftello");
904 d3s->de[j + 1].oldo.from = off; /* original lines start here */
907 for (nline = 0; nline < r1->to - r1->from; nline++) {
909 c = getc(d3s->fp[0]);
910 d = getc(d3s->fp[1]);
911 if (c == EOF && d == EOF)
914 return got_ferror(d3s->fp[0], GOT_ERR_EOF);
916 return got_ferror(d3s->fp[1], GOT_ERR_EOF);
919 long orig_line_len = nchar;
921 d = getc(d3s->fp[1]);
926 if (orig_line_len > nchar &&
927 fseek(d3s->fp[1], -(orig_line_len - nchar),
929 return got_ferror(d3s->fp[1],
931 /* original lines end here */
932 d3s->de[j + 1].oldo.to = off + orig_line_len;
933 err = repos(nchar, d3s);
941 /* original lines end here */
942 d3s->de[j + 1].oldo.to = off + nchar;
944 err = repos(nchar, d3s);
951 static const struct got_error *
952 repos(int nchar, struct diff3_state *d3s)
956 for (i = 0; i < 2; i++) {
957 if (fseek(d3s->fp[i], (long)-nchar, SEEK_CUR) == -1)
958 return got_ferror(d3s->fp[i], GOT_ERR_IO);
965 * collect an editing script for later regurgitation
967 static const struct got_error *
968 edit(struct diff *diff, int fdup, int *j, struct diff3_state *d3s)
970 const struct got_error *err = NULL;
973 if (((fdup + 1) & 3) == 0)
976 d3s->overlap[*j] = !fdup;
979 d3s->de[*j].old.from = diff->old.from;
980 d3s->de[*j].old.to = diff->old.to;
982 err = skip(&nskipped, 2, diff->new.from, d3s);
985 d3s->de[*j].newo.from = d3s->de[*j - 1].newo.to + nskipped;
987 err = skip(&nskipped, 2, diff->new.to, d3s);
990 d3s->de[*j].newo.to = d3s->de[*j].newo.from + nskipped;
995 static const struct got_error *
996 edscript(int n, struct diff3_state *d3s)
998 const struct got_error *err = NULL;
1001 size_t linesize = 0;
1002 ssize_t linelen = 0, k;
1004 for (; n > 0; n--) {
1005 if (!d3s->overlap[n]) {
1006 err = prange(&d3s->de[n].old, d3s);
1009 } else if (d3s->de[n].oldo.from < d3s->de[n].oldo.to) {
1010 /* Output a block of 3-way diff base file content. */
1011 err = diff_output(d3s->diffbuf, "%da\n:%s\n",
1012 d3s->de[n].old.to - 1, d3s->f2mark);
1015 if (fseeko(d3s->fp[1], d3s->de[n].oldo.from, SEEK_SET)
1017 return got_error_from_errno("fseeko");
1018 len = (d3s->de[n].oldo.to - d3s->de[n].oldo.from);
1019 for (k = 0; k < (ssize_t)len; k += linelen) {
1020 linelen = getline(&line, &linesize, d3s->fp[1]);
1021 if (linelen == -1) {
1022 if (feof(d3s->fp[1]))
1024 err = got_ferror(d3s->fp[1],
1028 err = diff_output(d3s->diffbuf, ":%s", line);
1032 err = diff_output(d3s->diffbuf, "%s%s\n",
1033 linelen > 0 && line[linelen] == '\n' ? ":" : "",
1034 GOT_DIFF_CONFLICT_MARKER_SEP);
1038 err = diff_output(d3s->diffbuf, "%da\n:%s\n",
1039 d3s->de[n].old.to -1, GOT_DIFF_CONFLICT_MARKER_SEP);
1043 if (fseeko(d3s->fp[2], d3s->de[n].newo.from, SEEK_SET)
1045 err = got_error_from_errno("fseek");
1048 len = (d3s->de[n].newo.to - d3s->de[n].newo.from);
1049 for (k = 0; k < (ssize_t)len; k += linelen) {
1050 linelen = getline(&line, &linesize, d3s->fp[2]);
1051 if (linelen == -1) {
1052 if (feof(d3s->fp[2]))
1054 err = got_ferror(d3s->fp[2], GOT_ERR_IO);
1057 err = diff_output(d3s->diffbuf, ":%s", line);
1062 if (!d3s->overlap[n]) {
1063 err = diff_output(d3s->diffbuf, ".\n");
1067 err = diff_output(d3s->diffbuf, "%s%s\n.\n",
1068 linelen > 0 && line[linelen] == '\n' ? ":" : "",
1072 err = diff_output(d3s->diffbuf, "%da\n:%s\n.\n",
1073 d3s->de[n].old.from - 1, d3s->f1mark);
1083 static const struct got_error *
1084 increase(struct diff3_state *d3s)
1090 /* are the memset(3) calls needed? */
1091 newsz = d3s->szchanges == 0 ? 64 : 2 * d3s->szchanges;
1092 incr = newsz - d3s->szchanges;
1094 d = reallocarray(d3s->d13, newsz, sizeof(*d3s->d13));
1096 return got_error_from_errno("reallocarray");
1098 memset(d3s->d13 + d3s->szchanges, 0, incr * sizeof(*d3s->d13));
1100 d = reallocarray(d3s->d23, newsz, sizeof(*d3s->d23));
1102 return got_error_from_errno("reallocarray");
1104 memset(d3s->d23 + d3s->szchanges, 0, incr * sizeof(*d3s->d23));
1106 d = reallocarray(d3s->de, newsz, sizeof(*d3s->de));
1108 return got_error_from_errno("reallocarray");
1110 memset(d3s->de + d3s->szchanges, 0, incr * sizeof(*d3s->de));
1112 s = reallocarray(d3s->overlap, newsz, sizeof(*d3s->overlap));
1114 return got_error_from_errno("reallocarray");
1116 memset(d3s->overlap + d3s->szchanges, 0, incr * sizeof(*d3s->overlap));
1117 d3s->szchanges = newsz;