support.c

#include <string.h>
#include "support.h"

/*
 * strlcat and strlcpy extracted from ircd-hybrid, originally taken
 * from the FreeBSD source.  This copy fixes a bug.
 *
 * They had the following Copyright info:
 *
 *
 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef HAVE_STRLCAT
size_t strlcat(char *dst, const char *src, size_t siz) {
   char       *d = dst;

   const char *s = src;

   size_t      n = siz, dlen;

   while (n-- != 0 && *d != '\0')
      d++;
   dlen = d - dst;
   n = siz - dlen;

   if (n == 0)
      return (dlen + strlen(s));
   while (*s != '\0') {
      if (n != 1) {
         *d++ = *s;
         n--;
      }
      s++;
   }
   *d = '\0';
   return (dlen + (s - src));          /* count does not include NULL */
}
#endif

#ifndef HAVE_STRLCPY
size_t strlcpy(char *dst, const char *src, size_t siz) {
   char       *d = dst;

   const char *s = src;

   size_t      n = siz;

   /*
    * Copy as many bytes as will fit 
    */
   if (n != 0 && --n != 0) {
      do {
         if ((*d++ = *s++) == 0)
            break;
      }
      while (--n != 0);
   }
   /*
    * Not enough room in dst, add NULL and traverse rest of src 
    */
   if (n == 0) {
      if (siz != 0)
         *d = '\0';                    /* NULL-terminate dst */
      while (*s++) ;
   }

   return (s - src - 1);               /* count does not include NULL */
}
#endif