strlcpy.c

00001 /*  $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $  */
00002 
00003 /*
00004  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
00005  *
00006  * Permission to use, copy, modify, and distribute this software for any
00007  * purpose with or without fee is hereby granted, provided that the above
00008  * copyright notice and this permission notice appear in all copies.
00009  *
00010  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
00011  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
00012  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
00013  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
00014  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
00015  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
00016  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
00017  */
00018 
00019 #ifdef HAVE_CONFIG_H
00020 #include "config.h"
00021 #endif
00022 
00023 #ifndef HAVE_STRLCPY
00024 
00025 #include <sys/types.h>
00026 #include <string.h>
00027 #include "strlcpycat.h"
00028 
00029 /*
00030  * Copy src to string dst of size siz.  At most siz-1 characters
00031  * will be copied.  Always NUL terminates (unless siz == 0).
00032  * Returns strlen(src); if retval >= siz, truncation occurred.
00033  */
00034 size_t
00035 strlcpy(char *dst, const char *src, size_t siz)
00036 {
00037     char *d = dst;
00038     const char *s = src;
00039     size_t n = siz;
00040 
00041     /* Copy as many bytes as will fit */
00042     if (n != 0 && --n != 0) {
00043         do {
00044             if ((*d++ = *s++) == 0)
00045                 break;
00046         } while (--n != 0);
00047     }
00048 
00049     /* Not enough room in dst, add NUL and traverse rest of src */
00050     if (n == 0) {
00051         if (siz != 0)
00052             *d = '\0';      /* NUL-terminate dst */
00053         while (*s++)
00054             ;
00055     }
00056 
00057     return(s - src - 1);    /* count does not include NUL */
00058 }
00059 
00060 #endif

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