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	strnsubst.c - sbase - suckless unix tools
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	strnsubst.c (1674B)
	---
	1 /*
	2 * Copyright (c) 2002 J. Mallett. All rights reserved.
	3 * You may do whatever you want with this file as long as
	4 * the above copyright and this notice remain intact, along
	5 * with the following statement:
	6 * For the man who taught me vi, and who got too old, too young.
	7 */
	8
	9 #include <stdio.h>
	10 #include <stdlib.h>
	11 #include <string.h>
	12
	13 #include "../util.h"
	14
	15 /*
	16 * Replaces str with a string consisting of str with match replaced with
	17 * replstr as many times as can be done before the constructed string is
	18 * maxsize bytes large. It does not free the string pointed to by str, …
	19 * is up to the calling program to be sure that the original contents of
	20 * str as well as the new contents are handled in an appropriate manner.
	21 * If replstr is NULL, then that internally is changed to a nil-string, …
	22 * that we can still pretend to do somewhat meaningful substitution.
	23 * No value is returned.
	24 */
	25 void
	26 strnsubst(char *str, const char match, const char *replstr, size_t max…
	27 {
	28 char s1, s2, *this;
	29 size_t matchlen, s2len;
	30 int n;
	31
	32 if ((s1 = *str) == NULL)
	33 return;
	34 s2 = emalloc(maxsize);
	35
	36 if (replstr == NULL)
	37 replstr = "";
	38
	39 if (match == NULL \|\| *match == '\0' \|\| strlen(s1) >= maxsize) {
	40 strlcpy(s2, s1, maxsize);
	41 goto done;
	42 }
	43
	44 *s2 = '\0';
	45 s2len = 0;
	46 matchlen = strlen(match);
	47 for (;;) {
	48 if ((this = strstr(s1, match)) == NULL)
	49 break;
	50 n = snprintf(s2 + s2len, maxsize - s2len, "%.*s%s",
	51 (int)(this - s1), s1, replstr);
	52 if (n == -1 \|\| n + s2len + strlen(this + matchlen) >= ma…
	53 break; /* out of room */
	54 s2len += n;
	55 s1 = this + matchlen;
	56 }
	57 strlcpy(s2 + s2len, s1, maxsize - s2len);
	58 done:
	59 *str = s2;
	60 return;
	61 }