IABSD.fr/xenocara/xserver/os/strlcat.c

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• Author : matthieu
  Date : 2012-06-10 13:21:05
  Hash : e60da745
  Message : Update to xserver 1.12.2. tested by naddy@, krw@, mpi@.

• xserver/os/strlcat.c

• /*
   * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
   * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
   * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
   * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
   * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #ifdef HAVE_DIX_CONFIG_H
  #include <dix-config.h>
  #endif
  
  #include <sys/types.h>
  #include <string.h>
  #include "os.h"
  
  /*
   * Appends src to string dst of size siz (unlike strncat, siz is the
   * full size of dst, not space left).  At most siz-1 characters
   * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
   * Returns strlen(src) + MIN(siz, strlen(initial dst)).
   * If retval >= siz, truncation occurred.
   */
  size_t
  strlcat(char *dst, const char *src, size_t siz)
  {
      register char *d = dst;
      register const char *s = src;
      register size_t n = siz;
      size_t dlen;
  
      /* Find the end of dst and adjust bytes left but don't go past end */
      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 NUL */
  }