65 lines
3.0 KiB
C
65 lines
3.0 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ This program is free software; you can redistribute it and/or modify │
|
|
│ it under the terms of the GNU General Public License as published by │
|
|
│ the Free Software Foundation; version 2 of the License. │
|
|
│ │
|
|
│ This program is distributed in the hope that it will be useful, but │
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
|
│ General Public License for more details. │
|
|
│ │
|
|
│ You should have received a copy of the GNU General Public License │
|
|
│ along with this program; if not, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/alg/alg.h"
|
|
#include "libc/alg/arraylist2.h"
|
|
#include "libc/bits/safemacros.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
/**
|
|
* Replaces all instances of NEEDLE in S with REPLACEMENT.
|
|
*
|
|
* @param needle can't be empty
|
|
* @return newly allocated memory that must be free()'d or NULL w/ errno
|
|
* @error ENOMEM, EINVAL
|
|
*/
|
|
char *(replacestr)(const char *s, const char *needle, const char *replacement) {
|
|
char *p1, *p2, *res_p;
|
|
size_t left, nlen, rlen, res_i, res_n;
|
|
if (*needle) {
|
|
p1 = s;
|
|
left = strlen(s);
|
|
nlen = strlen(needle);
|
|
rlen = strlen(replacement);
|
|
res_i = 0;
|
|
res_n = max(left, 32);
|
|
if ((res_p = malloc(res_n * sizeof(char)))) {
|
|
do {
|
|
if (!(p2 = memmem(p1, left, needle, nlen))) break;
|
|
if (CONCAT(&res_p, &res_i, &res_n, p1, p2 - p1) == -1 ||
|
|
CONCAT(&res_p, &res_i, &res_n, replacement, rlen) == -1) {
|
|
goto oom;
|
|
}
|
|
p2 += nlen;
|
|
left -= p2 - p1;
|
|
p1 = p2;
|
|
} while (left);
|
|
if (CONCAT(&res_p, &res_i, &res_n, p1, left + 1) != -1) {
|
|
return res_p;
|
|
}
|
|
}
|
|
oom:
|
|
free(res_p);
|
|
} else {
|
|
einval();
|
|
}
|
|
return NULL;
|
|
}
|