mirror of git://git.suckless.org/sbase
62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/*
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* Copyright (c) 2002 J. Mallett. All rights reserved.
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* You may do whatever you want with this file as long as
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* the above copyright and this notice remain intact, along
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* with the following statement:
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* For the man who taught me vi, and who got too old, too young.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../util.h"
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/*
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* Replaces str with a string consisting of str with match replaced with
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* replstr as many times as can be done before the constructed string is
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* maxsize bytes large. It does not free the string pointed to by str, it
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* is up to the calling program to be sure that the original contents of
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* str as well as the new contents are handled in an appropriate manner.
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* If replstr is NULL, then that internally is changed to a nil-string, so
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* that we can still pretend to do somewhat meaningful substitution.
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* No value is returned.
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*/
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void
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strnsubst(char **str, const char *match, const char *replstr, size_t maxsize)
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{
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char *s1, *s2, *this;
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size_t matchlen, s2len;
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int n;
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if ((s1 = *str) == NULL)
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return;
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s2 = emalloc(maxsize);
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if (replstr == NULL)
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replstr = "";
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if (match == NULL || *match == '\0' || strlen(s1) >= maxsize) {
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strlcpy(s2, s1, maxsize);
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goto done;
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}
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*s2 = '\0';
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s2len = 0;
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matchlen = strlen(match);
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for (;;) {
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if ((this = strstr(s1, match)) == NULL)
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break;
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n = snprintf(s2 + s2len, maxsize - s2len, "%.*s%s",
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(int)(this - s1), s1, replstr);
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if (n == -1 || n + s2len + strlen(this + matchlen) >= maxsize)
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break; /* out of room */
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s2len += n;
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s1 = this + matchlen;
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}
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strlcpy(s2 + s2len, s1, maxsize - s2len);
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done:
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*str = s2;
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return;
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}
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