external/bsd/iscsi/dist/src/lib/strlcpy.c

   1 /*      $NetBSD: strlcpy.c,v 1.3 2006/03/27 22:26:28 agc Exp $  */
   2 /*      $OpenBSD: strlcpy.c,v 1.7 2003/04/12 21:56:39 millert Exp $     */
   3
   4 /*
   5  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
  12  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  13  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
  14  * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  16  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  17  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #include "compat.h"
  21
  22 #include <sys/types.h>
  23 #include <assert.h>
  24 #include <string.h>
  25
  26
  27 #if !HAVE_STRLCPY
  28 /*
  29  * Copy src to string dst of size siz.  At most siz-1 characters
  30  * will be copied.  Always NUL terminates (unless siz == 0).
  31  * Returns strlen(src); if retval >= siz, truncation occurred.
  32  */
  33 size_t
  34 #ifdef _LIBC
  35 _strlcpy(dst, src, siz)
  36 #else
  37 strlcpy(dst, src, siz)
  38 #endif
  39         char *dst;
  40         const char *src;
  41         size_t siz;
  42 {
  43         char *d = dst;
  44         const char *s = src;
  45         size_t n = siz;
  46
  47         _DIAGASSERT(dst != NULL);
  48         _DIAGASSERT(src != NULL);
  49
  50         /* Copy as many bytes as will fit */
  51         if (n != 0 && --n != 0) {
  52                 do {
  53                         if ((*d++ = *s++) == 0)
  54                                 break;
  55                 } while (--n != 0);
  56         }
  57
  58         /* Not enough room in dst, add NUL and traverse rest of src */
  59         if (n == 0) {
  60                 if (siz != 0)
  61                         *d = '\0';              /* NUL-terminate dst */
  62                 while (*s++)
  63                         ;
  64         }
  65
  66         return(s - src - 1);    /* count does not include NUL */
  67 }
  68 #endif