pkgtools

binary package manager for zandra
git clone git://zandra.org/pkgtools
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strlcat.c (2005B)


      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  * Appends src to string dst of size siz (unlike strncat, siz is the
     21  * full size of dst, not space left).  At most siz-1 characters
     22  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
     23  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
     24  * If retval >= siz, truncation occurred.
     25  */
     26 size_t
     27 strlcat(char *dst, const char *src, size_t siz)
     28 {
     29         char *d = dst;
     30         const char *s = src;
     31         size_t n = siz;
     32         size_t dlen;
     33         /* Find the end of dst and adjust bytes left but don't go past end */
     34         while (n-- != 0 && *d != '\0')
     35                 d++;
     36         dlen = d - dst;
     37         n = siz - dlen;
     38         if (n == 0)
     39                 return(dlen + strlen(s));
     40         while (*s != '\0') {
     41                 if (n != 1) {
     42                         *d++ = *s;
     43                         n--;
     44                 }
     45                 s++;
     46         }
     47         *d = '\0';
     48         return(dlen + (s - src));       /* count does not include NUL */
     49 }
     50 
     51 size_t
     52 estrlcat(char *dst, const char *src, size_t siz)
     53 {
     54 	size_t r;
     55 
     56 	r = strlcat(dst, src, siz);
     57 	if (r >= siz) {
     58 		fprintf(stderr, "destination buffer too small\n");
     59 		exit(EXIT_FAILURE);
     60 	}
     61 	return r;
     62 }