stagit

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strlcat.c (1856B)
      1 /*	$OpenBSD: strlcat.c,v 1.15 2015/03/02 21:41:08 millert Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
      5  *
      6  * Permission to use, copy, modify, and distribute this software for any
      7  * purpose with or without fee is hereby granted, provided that the above
      8  * copyright notice and this permission notice appear in all copies.
      9  *
     10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     17  */
     18 
     19 #include <string.h>
     20 #include <sys/types.h>
     21 
     22 #include "compat.h"
     23 
     24 /*
     25  * Appends src to string dst of size dsize (unlike strncat, dsize is the
     26  * full size of dst, not space left).  At most dsize-1 characters
     27  * will be copied.  Always NUL terminates (unless dsize <= strlen(dst)).
     28  * Returns strlen(src) + MIN(dsize, strlen(initial dst)).
     29  * If retval >= dsize, truncation occurred.
     30  */
     31 size_t
     32 strlcat(char *dst, const char *src, size_t dsize) {
     33     const char *odst = dst;
     34     const char *osrc = src;
     35     size_t n = dsize;
     36     size_t dlen;
     37 
     38     /* Find the end of dst and adjust bytes left but don't go past end. */
     39     while (n-- != 0 && *dst != '\0')
     40         dst++;
     41     dlen = dst - odst;
     42     n = dsize - dlen;
     43 
     44     if (n-- == 0)
     45         return (dlen + strlen(src));
     46     while (*src != '\0') {
     47         if (n != 0) {
     48             *dst++ = *src;
     49             n--;
     50         }
     51         src++;
     52     }
     53     *dst = '\0';
     54 
     55     return (dlen + (src - osrc)); /* count does not include NUL */
     56 }