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/* $OpenBSD: src/lib/libc/string/strlcpy.c,v 1.11 2006/05/05 15:27:38
* millert Exp $ */
/*
* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <string.h>
#include <stdlib.h>
/*
* Copy src to string dst of size siz. At most siz-1 characters
* will be copied. Always NUL terminates (unless siz == 0).
* Returns strlen(src); if retval >= siz, truncation occurred.
*/
size_t strlcpy(char *dst, const char *src, size_t siz)
{
char *d = dst;
const char *s = src;
size_t n = siz;
/* Copy as many bytes as will fit */
if (n != 0) {
while (--n != 0) {
if ((*d++ = *s++) == '\0')
break;
}
}
/* Not enough room in dst, add NUL and traverse rest of src */
if (n == 0) {
if (siz != 0)
*d = '\0'; /* NUL-terminate dst */
while (*s++)
;
}
return (s - src - 1); /* count does not include NUL */
}
/*
* Appends src to string dst of size siz (unlike strncat, siz is the
* full size of dst, not space left). At most siz-1 characters
* will be copied. Always NUL terminates (unless siz <= strlen(dst)).
* Returns strlen(src) + MIN(siz, strlen(initial dst)).
* If retval >= siz, truncation occurred.
*/
size_t strlcat(char *dst, const char *src, size_t siz)
{
char *d = dst;
const char *s = src;
size_t n = siz;
size_t dlen;
/* Find the end of dst and adjust bytes left but don't go past end */
while (n-- != 0 && *d != '\0')
d++;
dlen = d - dst;
n = siz - dlen;
if (n == 0)
return (dlen + strlen(s));
while (*s != '\0') {
if (n != 1) {
*d++ = *s;
n--;
}
s++;
}
*d = '\0';
return (dlen + (s - src)); /* count does not include NUL */
}
char *str_replace(const char *str, const char *old, const char *new)
{
const char *ins;
char *result, *tmp;
size_t len_old, len_new, len_front, len_result;
int count;
if (!str || !old || !new)
return NULL;
len_old = strlen(old);
if (len_old == 0)
return NULL;
len_new = strlen(new);
ins = str;
for (count = 0; (tmp = strstr(ins, old)); ++count) {
ins = tmp + len_old;
}
len_result = strlen(str) + (len_new - len_old) * count + 1;
tmp = result = malloc(len_result);
if (!result)
return NULL;
while (count--) {
ins = strstr(str, old);
len_front = ins - str;
tmp = strncpy(tmp, str, len_front) + len_front;
strlcpy(tmp, new, len_result);
tmp += len_new;
str += len_front + len_old;
}
strlcpy(tmp, str, len_result);
return result;
}
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