Line data    Source code

       1           0 : /*      $OpenBSD: strlcpy.c,v 1.10 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             : #ifdef NEED_STRLCPY
      20             : 
      21             : #include <sys/types.h>
      22             : #include <string.h>
      23             : #include "bsd_string.h" /* DJS for Oolite on Linux/win32 */
      24             : 
      25             : /*
      26             :  * Copy src to string dst of size siz.  At most siz-1 characters
      27             :  * will be copied.  Always NUL terminates (unless siz == 0).
      28             :  * Returns strlen(src); if retval >= siz, truncation occurred.
      29             :  */
      30             : size_t
      31             : strlcpy(char *dst, const char *src, size_t siz)
      32             : {
      33             :         char *d = dst;
      34             :         const char *s = src;
      35             :         size_t n = siz;
      36             : 
      37             :         /* Copy as many bytes as will fit */
      38             :         if (n != 0 && --n != 0) {
      39             :                 do {
      40             :                         if ((*d++ = *s++) == 0)
      41             :                                 break;
      42             :                 } while (--n != 0);
      43             :         }
      44             : 
      45             :         /* Not enough room in dst, add NUL and traverse rest of src */
      46             :         if (n == 0) {
      47             :                 if (siz != 0)
      48             :                         *d = '\0';              /* NUL-terminate dst */
      49             :                 while (*s++)
      50             :                         ;
      51             :         }
      52             : 
      53             :         return(s - src - 1);    /* count does not include NUL */
      54             : }
      55             : #endif
      56             :