strlcpy.c - sbase - suckless unix tools
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       ---
       strlcpy.c (1689B)
       ---
            1 /*
            2  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
            3  *
            4  * Permission to use, copy, modify, and distribute this software for any
            5  * purpose with or without fee is hereby granted, provided that the above
            6  * copyright notice and this permission notice appear in all copies.
            7  *
            8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
            9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
           10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
           11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
           12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
           13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
           14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
           15  */
           16 
           17 #include <string.h>
           18 #include <sys/types.h>
           19 
           20 #include "../util.h"
           21 
           22 /*
           23  * Copy src to string dst of size siz. At most siz-1 characters
           24  * will be copied. Always NUL terminates (unless siz == 0).
           25  * Returns strlen(src); if retval >= siz, truncation occurred.
           26  */
           27 size_t
           28 strlcpy(char *dst, const char *src, size_t siz)
           29 {
           30         char *d = dst;
           31         const char *s = src;
           32         size_t n = siz;
           33         /* Copy as many bytes as will fit */
           34         if (n != 0) {
           35                 while (--n != 0) {
           36                         if ((*d++ = *s++) == '\0')
           37                                 break;
           38                 }
           39         }
           40         /* Not enough room in dst, add NUL and traverse rest of src */
           41         if (n == 0) {
           42                 if (siz != 0)
           43                         *d = '\0'; /* NUL-terminate dst */
           44                 while (*s++)
           45                         ;
           46         }
           47         return(s - src - 1); /* count does not include NUL */
           48 }
           49 
           50 size_t
           51 estrlcpy(char *dst, const char *src, size_t siz)
           52 {
           53         size_t ret;
           54 
           55         if ((ret = strlcpy(dst, src, siz)) >= siz)
           56                 eprintf("strlcpy: input string too long\n");
           57 
           58         return ret;
           59 }