121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2019 Nicholas Marriott <nicholas.marriott@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <regex.h>
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#include <string.h>
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#include "tmux.h"
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static void
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regsub_copy(char **buf, ssize_t *len, const char *text, size_t start, size_t end)
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{
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size_t add = end - start;
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*buf = xrealloc(*buf, (*len) + add + 1);
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memcpy((*buf) + *len, text + start, add);
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(*len) += add;
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}
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static void
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regsub_expand(char **buf, ssize_t *len, const char *with, const char *text,
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regmatch_t *m, u_int n)
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{
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const char *cp;
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u_int i;
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for (cp = with; *cp != '\0'; cp++) {
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if (*cp == '\\') {
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cp++;
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if (*cp >= '0' && *cp <= '9') {
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i = *cp - '0';
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if (i < n && m[i].rm_so != m[i].rm_eo) {
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regsub_copy(buf, len, text, m[i].rm_so,
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m[i].rm_eo);
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continue;
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}
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}
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}
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*buf = xrealloc(*buf, (*len) + 2);
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(*buf)[(*len)++] = *cp;
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}
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}
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char *
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regsub(const char *pattern, const char *with, const char *text, int flags)
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{
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regex_t r;
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regmatch_t m[10];
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ssize_t start, end, last, len = 0;
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int empty = 0;
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char *buf = NULL;
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if (*text == '\0')
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return (xstrdup(""));
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if (regcomp(&r, pattern, flags) != 0)
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return (NULL);
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start = 0;
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last = 0;
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end = strlen(text);
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while (start <= end) {
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if (regexec(&r, text + start, nitems(m), m, 0) != 0) {
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regsub_copy(&buf, &len, text, start, end);
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break;
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}
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/*
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* Append any text not part of this match (from the end of the
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* last match).
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*/
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regsub_copy(&buf, &len, text, last, m[0].rm_so + start);
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/*
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* If the last match was empty and this one isn't (it is either
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* later or has matched text), expand this match. If it is
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* empty, move on one character and try again from there.
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*/
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if (empty ||
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start + m[0].rm_so != last ||
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m[0].rm_so != m[0].rm_eo) {
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regsub_expand(&buf, &len, with, text + start, m,
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nitems(m));
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last = start + m[0].rm_eo;
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start += m[0].rm_eo;
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empty = 0;
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} else {
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last = start + m[0].rm_eo;
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start += m[0].rm_eo + 1;
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empty = 1;
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}
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/* Stop now if anchored to start. */
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if (*pattern == '^') {
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regsub_copy(&buf, &len, text, start, end);
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break;
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}
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}
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buf[len] = '\0';
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regfree(&r);
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return (buf);
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}
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