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contrib/libdiff/compat/strlcpy.c
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/* $OpenBSD: strlcpy.c,v 1.16 2019/01/25 00:19:25 millert Exp $ */ | |||||
/* | |||||
* Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org> | |||||
* | |||||
* 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> | |||||
/* | |||||
* Copy string src to buffer dst of size dsize. At most dsize-1 | |||||
* chars will be copied. Always NUL terminates (unless dsize == 0). | |||||
* Returns strlen(src); if retval >= dsize, truncation occurred. | |||||
*/ | |||||
size_t | |||||
strlcpy(char *dst, const char *src, size_t dsize) | |||||
{ | |||||
const char *osrc = src; | |||||
size_t nleft = dsize; | |||||
/* Copy as many bytes as will fit. */ | |||||
if (nleft != 0) { | |||||
while (--nleft != 0) { | |||||
if ((*dst++ = *src++) == '\0') | |||||
break; | |||||
} | |||||
} | |||||
/* Not enough room in dst, add NUL and traverse rest of src. */ | |||||
if (nleft == 0) { | |||||
if (dsize != 0) | |||||
*dst = '\0'; /* NUL-terminate dst */ | |||||
while (*src++) | |||||
; | |||||
} | |||||
return(src - osrc - 1); /* count does not include NUL */ | |||||
} |