kc3-lang/libbsd/src/strlcat.c

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• Hash : 8103fe14
  Author :
  Date : 2010-01-10T01:33:07
  

  Update strlcat and strlcpy from OpenBSD

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• src/strlcat.c

• /*	$OpenBSD: strlcat.c,v 1.12 2005/03/30 20:13:52 otto Exp $	*/
  
  /*
   * 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 THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
   */
  
  #include <sys/types.h>
  #include <string.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)
  {
  	char *d = dst;
  	const char *s = src;
  	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 */
  }
  

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