gonzui

    1: /*      $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $   */
    2: 
    3: /*
    4:  * Copyright (c) 1998 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 <sys/types.h>
   20: #include <string.h>
   21: 
   22: /*
   23:  * Appends src to string dst of size siz (unlike strncat, siz is the
   24:  * full size of dst, not space left).  At most siz-1 characters
   25:  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
   26:  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
   27:  * If retval >= siz, truncation occurred.
   28:  */
   29: size_t
   30: strlcat(char *dst, const char *src, size_t siz)
   31: {
   32:         char *d = dst;
   33:         const char *s = src;
   34:         size_t n = siz;
   35:         size_t dlen;
   36: 
   37:         /* Find the end of dst and adjust bytes left but don't go past end */
   38:         while (n-- != 0 && *d != '\0')
   39:                 d++;
   40:         dlen = d - dst;
   41:         n = siz - dlen;
   42: 
   43:         if (n == 0)
   44:                 return(dlen + strlen(s));
   45:         while (*s != '\0') {
   46:                 if (n != 1) {
   47:                         *d++ = *s;
   48:                         n--;
   49:                 }
   50:                 s++;
   51:         }
   52:         *d = '\0';
   53: 
   54:         return(dlen + (s - src));      /* count does not include NUL */
   55: }