1 /* $OpenBSD: diff3.c,v 1.41 2016/10/18 21:06:52 millert Exp $ */
4 * Copyright (C) Caldera International Inc. 2001-2002.
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8 * modification, are permitted provided that the following conditions
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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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54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 * @(#)diff3.c 8.1 (Berkeley) 6/6/93
68 #include <sys/queue.h>
81 #include "got_error.h"
82 #include "got_opentemp.h"
83 #include "got_object.h"
88 #include "got_lib_diff.h"
91 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
94 /* diff3 - 3-way differential file comparison */
96 /* diff3 [-ex3EX] d13 d23 f1 f2 f3 [m1 m3]
98 * d13 = diff report on f1 vs f3
99 * d23 = diff report on f2 vs f3
100 * f1, f2, f3 the 3 files
101 * if changes in f1 overlap with changes in f3, m1 and m3 are used
102 * to mark the overlaps; otherwise, the file names f1 and f3 are used
103 * (only for options E and X).
107 * "from" is first in range of changed lines; "to" is last+1
108 * from=to=line after point of insertion for added lines.
121 struct line_range old;
122 struct line_range new;
123 struct off_range oldo;
124 struct off_range newo;
134 * "de" is used to gather editing scripts. These are later spewed out
135 * in reverse order. Its first element must be all zero, the "new"
136 * component of "de" contains line positions, and "oldo" and "newo"
137 * components contain byte positions.
138 * Array overlap indicates which sections in "de" correspond to lines
139 * that are different in all three files.
145 int cline[3]; /* # of the last-read line in each file (0-2) */
148 * the latest known correspondence between line numbers of the 3 files
149 * is stored in last[1-3];
152 char f1mark[PATH_MAX];
153 char f2mark[PATH_MAX];
154 char f3mark[PATH_MAX];
162 static const struct got_error *duplicate(int *, int, struct line_range *,
163 struct line_range *, struct diff3_state *);
164 static const struct got_error *edit(struct diff *, int, int *,
165 struct diff3_state *);
166 static const struct got_error *getchange(char **, FILE *, struct diff3_state *);
167 static const struct got_error *get_line(char **, FILE *, size_t *,
168 struct diff3_state *);
169 static int number(char **);
170 static const struct got_error *readin(size_t *, char *, struct diff **,
171 struct diff3_state *);
172 static int ed_patch_lines(struct rcs_lines *, struct rcs_lines *);
173 static const struct got_error *skip(size_t *, int, int, struct diff3_state *);
174 static const struct got_error *edscript(int, struct diff3_state *);
175 static const struct got_error *merge(size_t, size_t, struct diff3_state *);
176 static const struct got_error *prange(struct line_range *,
177 struct diff3_state *);
178 static const struct got_error *repos(int, struct diff3_state *);
179 static const struct got_error *increase(struct diff3_state *);
180 static const struct got_error *diff3_internal(char *, char *, char *,
181 char *, char *, const char *, const char *, struct diff3_state *,
182 const char *, const char *, const char *);
184 static const struct got_error *
185 diff_output(BUF *diffbuf, const char *fmt, ...)
187 const struct got_error *err = NULL;
194 i = vasprintf(&str, fmt, vap);
197 return got_error_from_errno("vasprintf");
198 err = buf_append(&newsize, diffbuf, str, strlen(str));
203 static const struct got_error*
204 diffreg(BUF **d, const char *path1, const char *path2,
205 enum got_diff_algorithm diff_algo)
207 const struct got_error *err = NULL;
208 FILE *f1 = NULL, *f2 = NULL, *outfile = NULL;
209 char *outpath = NULL;
210 struct got_diffreg_result *diffreg_result = NULL;
214 f1 = fopen(path1, "re");
216 err = got_error_from_errno2("fopen", path1);
219 f2 = fopen(path2, "re");
221 err = got_error_from_errno2("fopen", path2);
225 err = got_opentemp_named(&outpath, &outfile,
226 GOT_TMPDIR_STR "/got-diffreg", "");
230 err = got_diffreg(&diffreg_result, f1, f2, diff_algo, 0, 0);
234 if (diffreg_result) {
235 struct diff_result *diff_result = diffreg_result->result;
236 int atomizer_flags = (diff_result->left->atomizer_flags |
237 diff_result->right->atomizer_flags);
238 if ((atomizer_flags & DIFF_ATOMIZER_FOUND_BINARY_DATA)) {
239 err = got_error(GOT_ERR_FILE_BINARY);
244 err = got_diffreg_output(NULL, NULL, diffreg_result, 1, 1, "", "",
245 GOT_DIFF_OUTPUT_PLAIN, 0, outfile);
249 if (fflush(outfile) != 0) {
250 err = got_error_from_errno2("fflush", outpath);
253 if (fseek(outfile, 0L, SEEK_SET) == -1) {
254 err = got_ferror(outfile, GOT_ERR_IO);
258 err = buf_load(d, outfile);
261 if (unlink(outpath) == -1 && err == NULL)
262 err = got_error_from_errno2("unlink", outpath);
265 if (outfile && fclose(outfile) == EOF && err == NULL)
266 err = got_error_from_errno("fclose");
267 if (f1 && fclose(f1) == EOF && err == NULL)
268 err = got_error_from_errno("fclose");
269 if (f2 && fclose(f2) == EOF && err == NULL)
270 err = got_error_from_errno("fclose");
277 const struct got_error *
278 got_merge_diff3(int *overlapcnt, int outfd, FILE *f1, FILE *f2,
279 FILE *f3, const char *label1, const char *label2, const char *label3,
280 enum got_diff_algorithm diff_algo)
282 const struct got_error *err = NULL;
283 char *dp13, *dp23, *path1, *path2, *path3;
284 BUF *b1, *b2, *b3, *d1, *d2, *diffb;
285 u_char *data, *patch;
286 size_t dlen, plen, i;
287 struct diff3_state *d3s;
291 d3s = calloc(1, sizeof(*d3s));
293 return got_error_from_errno("calloc");
295 b1 = b2 = b3 = d1 = d2 = diffb = NULL;
296 dp13 = dp23 = path1 = path2 = path3 = NULL;
299 err = buf_load(&b1, f1);
302 err = buf_load(&b2, f2);
305 err = buf_load(&b3, f3);
309 err = buf_alloc(&diffb, 128);
313 if (asprintf(&path1, GOT_TMPDIR_STR "/got-diff1.XXXXXXXXXX") == -1) {
314 err = got_error_from_errno("asprintf");
317 if (asprintf(&path2, GOT_TMPDIR_STR "/got-diff2.XXXXXXXXXX") == -1) {
318 err = got_error_from_errno("asprintf");
321 if (asprintf(&path3, GOT_TMPDIR_STR "/got-diff3.XXXXXXXXXX") == -1) {
322 err = got_error_from_errno("asprintf");
326 err = buf_write_stmp(b1, path1);
329 err = buf_write_stmp(b2, path2);
332 err = buf_write_stmp(b3, path3);
339 err = diffreg(&d1, path1, path3, diff_algo);
346 err = diffreg(&d2, path2, path3, diff_algo);
353 if (asprintf(&dp13, GOT_TMPDIR_STR "/got-d13.XXXXXXXXXX") == -1) {
354 err = got_error_from_errno("asprintf");
357 err = buf_write_stmp(d1, dp13);
364 if (asprintf(&dp23, GOT_TMPDIR_STR "/got-d23.XXXXXXXXXX") == -1) {
365 err = got_error_from_errno("asprintf");
368 err = buf_write_stmp(d2, dp23);
375 d3s->diffbuf = diffb;
376 err = diff3_internal(dp13, dp23, path1, path2, path3,
377 label1, label3, d3s, label1, label2, label3);
384 plen = buf_len(diffb);
385 patch = buf_release(diffb);
387 data = buf_release(b1);
389 diffb = rcs_patchfile(data, dlen, patch, plen, ed_patch_lines);
396 if (unlink(path1) == -1 && err == NULL)
397 err = got_error_from_errno2("unlink", path1);
398 if (unlink(path2) == -1 && err == NULL)
399 err = got_error_from_errno2("unlink", path2);
400 if (unlink(path3) == -1 && err == NULL)
401 err = got_error_from_errno2("unlink", path3);
402 if (unlink(dp13) == -1 && err == NULL)
403 err = got_error_from_errno2("unlink", dp13);
404 if (unlink(dp23) == -1 && err == NULL)
405 err = got_error_from_errno2("unlink", dp23);
415 for (i = 0; i < nitems(d3s->fp); i++) {
416 if (d3s->fp[i] && fclose(d3s->fp[i]) == EOF && err == NULL)
417 err = got_error_from_errno("fclose");
419 if (err == NULL && diffb) {
420 if (buf_write_fd(diffb, outfd) < 0)
421 err = got_error_from_errno("buf_write_fd");
422 *overlapcnt = d3s->overlapcnt;
429 static const struct got_error *
430 diff3_internal(char *dp13, char *dp23, char *path1, char *path2, char *path3,
431 const char *fmark, const char *rmark, struct diff3_state *d3s,
432 const char *label1, const char *label2, const char *label3)
434 const struct got_error *err = NULL;
438 i = snprintf(d3s->f1mark, sizeof(d3s->f1mark),
439 "%s%s%s", GOT_DIFF_CONFLICT_MARKER_BEGIN,
440 label1 ? " " : "", label1 ? label1 : "");
441 if (i < 0 || i >= (int)sizeof(d3s->f1mark))
442 return got_error(GOT_ERR_NO_SPACE);
444 i = snprintf(d3s->f2mark, sizeof(d3s->f2mark),
445 "%s%s%s", GOT_DIFF_CONFLICT_MARKER_ORIG,
446 label2 ? " " : "", label2 ? label2 : "");
447 if (i < 0 || i >= (int)sizeof(d3s->f2mark))
448 return got_error(GOT_ERR_NO_SPACE);
450 i = snprintf(d3s->f3mark, sizeof(d3s->f3mark),
451 "%s%s%s", GOT_DIFF_CONFLICT_MARKER_END,
452 label3 ? " " : "", label3 ? label3 : "");
453 if (i < 0 || i >= (int)sizeof(d3s->f3mark))
454 return got_error(GOT_ERR_NO_SPACE);
460 err = readin(&m, dp13, &d3s->d13, d3s);
463 err = readin(&n, dp23, &d3s->d23, d3s);
467 if ((d3s->fp[0] = fopen(path1, "re")) == NULL)
468 return got_error_from_errno2("fopen", path1);
469 if ((d3s->fp[1] = fopen(path2, "re")) == NULL)
470 return got_error_from_errno2("fopen", path2);
471 if ((d3s->fp[2] = fopen(path3, "re")) == NULL)
472 return got_error_from_errno2("fopen", path3);
474 return merge(m, n, d3s);
478 ed_patch_lines(struct rcs_lines *dlines, struct rcs_lines *plines)
481 struct rcs_line *sort, *lp, *dlp, *ndlp, *insert_after;
482 int start, end, i, lineno;
485 dlp = TAILQ_FIRST(&(dlines->l_lines));
486 lp = TAILQ_FIRST(&(plines->l_lines));
489 for (lp = TAILQ_NEXT(lp, l_list); lp != NULL;
490 lp = TAILQ_NEXT(lp, l_list)) {
491 /* Skip blank lines */
495 /* NUL-terminate line buffer for strtol() safety. */
496 tmp = lp->l_line[lp->l_len - 1];
497 lp->l_line[lp->l_len - 1] = '\0';
499 /* len - 1 is NUL terminator so we use len - 2 for 'op' */
500 op = lp->l_line[lp->l_len - 2];
501 start = (int)strtol(lp->l_line, &ep, 10);
503 /* Restore the last byte of the buffer */
504 lp->l_line[lp->l_len - 1] = tmp;
507 if (start > dlines->l_nblines ||
508 start < 0 || *ep != 'a')
510 } else if (op == 'c') {
511 if (start > dlines->l_nblines ||
512 start < 0 || (*ep != ',' && *ep != 'c'))
517 end = (int)strtol(ep, &ep, 10);
518 if (end < 0 || *ep != 'c')
529 if (dlp->l_lineno == start)
531 if (dlp->l_lineno > start) {
532 dlp = TAILQ_PREV(dlp, tqh, l_list);
533 } else if (dlp->l_lineno < start) {
534 ndlp = TAILQ_NEXT(dlp, l_list);
535 if (ndlp->l_lineno > start)
546 insert_after = TAILQ_PREV(dlp, tqh, l_list);
547 for (i = 0; i <= (end - start); i++) {
548 ndlp = TAILQ_NEXT(dlp, l_list);
549 TAILQ_REMOVE(&(dlines->l_lines), dlp, l_list);
555 if (op == 'a' || op == 'c') {
558 lp = TAILQ_NEXT(lp, l_list);
562 if (lp->l_len == 2 &&
563 lp->l_line[0] == '.' &&
564 lp->l_line[1] == '\n')
567 if (lp->l_line[0] == ':') {
571 TAILQ_REMOVE(&(plines->l_lines), lp, l_list);
572 TAILQ_INSERT_AFTER(&(dlines->l_lines), dlp,
576 lp->l_lineno = start;
582 * always resort lines as the markers might be put at the
583 * same line as we first started editing.
586 TAILQ_FOREACH(sort, &(dlines->l_lines), l_list)
587 sort->l_lineno = lineno++;
588 dlines->l_nblines = lineno - 1;
595 * Pick up the line numbers of all changes from one change file.
596 * (This puts the numbers in a vector, which is not strictly necessary,
597 * since the vector is processed in one sequential pass.
598 * The vector could be optimized out of existence)
600 static const struct got_error *
601 readin(size_t *n, char *name, struct diff **dd, struct diff3_state *d3s)
603 const struct got_error *err = NULL;
611 f = fopen(name, "re");
613 return got_error_from_errno2("fopen", name);
614 err = getchange(&p, f, d3s);
617 for (i = 0; p; i++) {
618 if (i >= d3s->szchanges - 1) {
640 (*dd)[i].old.from = a;
642 (*dd)[i].new.from = c;
645 err = getchange(&p, f, d3s);
651 (*dd)[i].old.from = (*dd)[i - 1].old.to;
652 (*dd)[i].new.from = (*dd)[i - 1].new.to;
655 if (fclose(f) == EOF && err == NULL)
656 err = got_error_from_errno("fclose");
668 while (isdigit((unsigned char)(**lc)))
669 nn = nn*10 + *(*lc)++ - '0';
674 static const struct got_error *
675 getchange(char **line, FILE *b, struct diff3_state *d3s)
677 const struct got_error *err = NULL;
681 if (*line && isdigit((unsigned char)(*line)[0]))
683 err = get_line(line, b, NULL, d3s);
691 static const struct got_error *
692 get_line(char **ret, FILE *b, size_t *n, struct diff3_state *d3s)
694 const struct got_error *err = NULL;
704 len = getline(&cp, &size, b);
707 err = got_error_from_errno("getline");
711 if (cp[len - 1] != '\n') {
713 if (len + 1 > size) {
714 new = realloc(cp, len + 1);
716 err = got_error_from_errno("realloc");
726 *ret = d3s->buf = cp;
735 static const struct got_error *
736 merge(size_t m1, size_t m2, struct diff3_state *d3s)
738 const struct got_error *err = NULL;
739 struct diff *d1, *d2;
746 t1 = (d1 < d3s->d13 + m1);
747 t2 = (d2 < d3s->d23 + m2);
751 /* first file is different from others */
752 if (!t2 || (t1 && d1->new.to < d2->new.from)) {
753 /* stuff peculiar to 1st file */
758 /* second file is different from others */
759 if (!t1 || (t2 && d2->new.to < d1->new.from)) {
765 * Merge overlapping changes in first file
766 * this happens after extension (see below).
768 if (d1 + 1 < d3s->d13 + m1 && d1->new.to >= d1[1].new.from) {
769 d1[1].old.from = d1->old.from;
770 d1[1].new.from = d1->new.from;
775 /* merge overlapping changes in second */
776 if (d2 + 1 < d3s->d23 + m2 && d2->new.to >= d2[1].new.from) {
777 d2[1].old.from = d2->old.from;
778 d2[1].new.from = d2->new.from;
782 /* stuff peculiar to third file or different in all */
783 if (d1->new.from == d2->new.from && d1->new.to == d2->new.to) {
784 err = duplicate(&dpl, j, &d1->old, &d2->old, d3s);
789 * dpl = 0 means all files differ
790 * dpl = 1 means files 1 and 2 identical
792 err = edit(d1, dpl, &j, d3s);
801 * Overlapping changes from file 1 and 2; extend changes
802 * appropriately to make them coincide.
804 if (d1->new.from < d2->new.from) {
805 d2->old.from -= d2->new.from - d1->new.from;
806 d2->new.from = d1->new.from;
807 } else if (d2->new.from < d1->new.from) {
808 d1->old.from -= d1->new.from - d2->new.from;
809 d1->new.from = d2->new.from;
811 if (d1->new.to > d2->new.to) {
812 d2->old.to += d1->new.to - d2->new.to;
813 d2->new.to = d1->new.to;
814 } else if (d2->new.to > d1->new.to) {
815 d1->old.to += d2->new.to - d1->new.to;
816 d1->new.to = d2->new.to;
820 return (edscript(j, d3s));
824 * print the range of line numbers, rold.from thru rold.to, as n1,n2 or n1
826 static const struct got_error *
827 prange(struct line_range *rold, struct diff3_state *d3s)
829 const struct got_error *err = NULL;
831 if (rold->to <= rold->from) {
832 err = diff_output(d3s->diffbuf, "%da\n", rold->from - 1);
836 err = diff_output(d3s->diffbuf, "%d", rold->from);
839 if (rold->to > rold->from + 1) {
840 err = diff_output(d3s->diffbuf, ",%d", rold->to - 1);
844 err = diff_output(d3s->diffbuf, "c\n");
853 * Skip to just before line number from in file "i".
854 * Return the number of bytes skipped in *nskipped.
856 static const struct got_error *
857 skip(size_t *nskipped, int i, int from, struct diff3_state *d3s)
859 const struct got_error *err = NULL;
864 for (n = 0; d3s->cline[i] < from - 1; n += len) {
865 err = get_line(&line, d3s->fp[i], &len, d3s);
875 * Set *dpl to 1 or 0 according as the old range (in file 1) contains exactly
876 * the same data as the new range (in file 2).
878 * If this change could overlap, remember start/end offsets in file 2 so we
879 * can write out the original lines of text if a merge conflict occurs.
881 static const struct got_error *
882 duplicate(int *dpl, int j, struct line_range *r1, struct line_range *r2,
883 struct diff3_state *d3s)
885 const struct got_error *err = NULL;
894 if (r1->to - r1->from != r2->to - r2->from)
897 err = skip(&nskipped, 0, r1->from, d3s);
900 err = skip(&nskipped, 1, r2->from, d3s);
904 off = ftello(d3s->fp[1]);
906 return got_error_from_errno("ftello");
907 d3s->de[j + 1].oldo.from = off; /* original lines start here */
910 for (nline = 0; nline < r1->to - r1->from; nline++) {
912 c = getc(d3s->fp[0]);
913 d = getc(d3s->fp[1]);
914 if (c == EOF && d == EOF)
917 return got_ferror(d3s->fp[0], GOT_ERR_EOF);
919 return got_ferror(d3s->fp[1], GOT_ERR_EOF);
922 long orig_line_len = nchar;
924 d = getc(d3s->fp[1]);
929 if (orig_line_len > nchar &&
930 fseek(d3s->fp[1], -(orig_line_len - nchar),
932 return got_ferror(d3s->fp[1],
934 /* original lines end here */
935 d3s->de[j + 1].oldo.to = off + orig_line_len;
936 err = repos(nchar, d3s);
944 /* original lines end here */
945 d3s->de[j + 1].oldo.to = off + nchar;
947 err = repos(nchar, d3s);
954 static const struct got_error *
955 repos(int nchar, struct diff3_state *d3s)
959 for (i = 0; i < 2; i++) {
960 if (fseek(d3s->fp[i], (long)-nchar, SEEK_CUR) == -1)
961 return got_ferror(d3s->fp[i], GOT_ERR_IO);
968 * collect an editing script for later regurgitation
970 static const struct got_error *
971 edit(struct diff *diff, int fdup, int *j, struct diff3_state *d3s)
973 const struct got_error *err = NULL;
976 if (((fdup + 1) & 3) == 0)
979 d3s->overlap[*j] = !fdup;
982 d3s->de[*j].old.from = diff->old.from;
983 d3s->de[*j].old.to = diff->old.to;
985 err = skip(&nskipped, 2, diff->new.from, d3s);
988 d3s->de[*j].newo.from = d3s->de[*j - 1].newo.to + nskipped;
990 err = skip(&nskipped, 2, diff->new.to, d3s);
993 d3s->de[*j].newo.to = d3s->de[*j].newo.from + nskipped;
998 static const struct got_error *
999 edscript(int n, struct diff3_state *d3s)
1001 const struct got_error *err = NULL;
1004 size_t linesize = 0;
1005 ssize_t linelen = 0, k;
1007 for (; n > 0; n--) {
1008 if (!d3s->overlap[n]) {
1009 err = prange(&d3s->de[n].old, d3s);
1012 } else if (d3s->de[n].oldo.from < d3s->de[n].oldo.to) {
1013 /* Output a block of 3-way diff base file content. */
1014 err = diff_output(d3s->diffbuf, "%da\n:%s\n",
1015 d3s->de[n].old.to - 1, d3s->f2mark);
1018 if (fseeko(d3s->fp[1], d3s->de[n].oldo.from, SEEK_SET)
1020 return got_error_from_errno("fseeko");
1021 len = (d3s->de[n].oldo.to - d3s->de[n].oldo.from);
1022 for (k = 0; k < (ssize_t)len; k += linelen) {
1023 linelen = getline(&line, &linesize, d3s->fp[1]);
1024 if (linelen == -1) {
1025 if (feof(d3s->fp[1]))
1027 err = got_ferror(d3s->fp[1],
1031 err = diff_output(d3s->diffbuf, ":%s", line);
1035 err = diff_output(d3s->diffbuf, "%s%s\n",
1036 linelen > 0 && line[linelen] == '\n' ? ":" : "",
1037 GOT_DIFF_CONFLICT_MARKER_SEP);
1041 err = diff_output(d3s->diffbuf, "%da\n:%s\n",
1042 d3s->de[n].old.to -1, GOT_DIFF_CONFLICT_MARKER_SEP);
1046 if (fseeko(d3s->fp[2], d3s->de[n].newo.from, SEEK_SET)
1048 err = got_error_from_errno("fseek");
1051 len = (d3s->de[n].newo.to - d3s->de[n].newo.from);
1052 for (k = 0; k < (ssize_t)len; k += linelen) {
1053 linelen = getline(&line, &linesize, d3s->fp[2]);
1054 if (linelen == -1) {
1055 if (feof(d3s->fp[2]))
1057 err = got_ferror(d3s->fp[2], GOT_ERR_IO);
1060 err = diff_output(d3s->diffbuf, ":%s", line);
1065 if (!d3s->overlap[n]) {
1066 err = diff_output(d3s->diffbuf, ".\n");
1070 err = diff_output(d3s->diffbuf, "%s%s\n.\n",
1071 linelen > 0 && line[linelen] == '\n' ? ":" : "",
1075 err = diff_output(d3s->diffbuf, "%da\n:%s\n.\n",
1076 d3s->de[n].old.from - 1, d3s->f1mark);
1086 static const struct got_error *
1087 increase(struct diff3_state *d3s)
1093 /* are the memset(3) calls needed? */
1094 newsz = d3s->szchanges == 0 ? 64 : 2 * d3s->szchanges;
1095 incr = newsz - d3s->szchanges;
1097 d = reallocarray(d3s->d13, newsz, sizeof(*d3s->d13));
1099 return got_error_from_errno("reallocarray");
1101 memset(d3s->d13 + d3s->szchanges, 0, incr * sizeof(*d3s->d13));
1103 d = reallocarray(d3s->d23, newsz, sizeof(*d3s->d23));
1105 return got_error_from_errno("reallocarray");
1107 memset(d3s->d23 + d3s->szchanges, 0, incr * sizeof(*d3s->d23));
1109 d = reallocarray(d3s->de, newsz, sizeof(*d3s->de));
1111 return got_error_from_errno("reallocarray");
1113 memset(d3s->de + d3s->szchanges, 0, incr * sizeof(*d3s->de));
1115 s = reallocarray(d3s->overlap, newsz, sizeof(*d3s->overlap));
1117 return got_error_from_errno("reallocarray");
1119 memset(d3s->overlap + d3s->szchanges, 0, incr * sizeof(*d3s->overlap));
1120 d3s->szchanges = newsz;