pkgtools

morpheus pkg tools
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strlcpy.c (1904B)


      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 "pkg.h"
     18 
     19 /*
     20  * Copy src to string dst of size siz.  At most siz-1 characters
     21  * will be copied.  Always NUL terminates (unless siz == 0).
     22  * Returns strlen(src); if retval >= siz, truncation occurred.
     23  */
     24 size_t
     25 strlcpy(char *dst, const char *src, size_t siz)
     26 {
     27         char *d = dst;
     28         const char *s = src;
     29         size_t n = siz;
     30         /* Copy as many bytes as will fit */
     31         if (n != 0) {
     32                 while (--n != 0) {
     33                         if ((*d++ = *s++) == '\0')
     34                                 break;
     35                 }
     36         }
     37         /* Not enough room in dst, add NUL and traverse rest of src */
     38         if (n == 0) {
     39                 if (siz != 0)
     40                         *d = '\0';              /* NUL-terminate dst */
     41                 while (*s++)
     42                         ;
     43         }
     44         return(s - src - 1);    /* count does not include NUL */
     45 }
     46 
     47 size_t
     48 estrlcpy(char *dst, const char *src, size_t siz)
     49 {
     50 	size_t r;
     51 
     52 	r = strlcpy(dst, src, siz);
     53 	if (r >= siz) {
     54 		fprintf(stderr, "destination buffer too small\n");
     55 		exit(EXIT_FAILURE);
     56 	}
     57 	return r;
     58 }