gonzui

    1: /*      $OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert 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: #include <sys/types.h>
   20: #include <string.h>
   21: 
   22: /*
   23:  * Copy src to string dst of size siz.  At most siz-1 characters
   24:  * will be copied.  Always NUL terminates (unless siz == 0).
   25:  * Returns strlen(src); if retval >= siz, truncation occurred.
   26:  */
   27: size_t
   28: strlcpy(char *dst, const char *src, size_t siz)
   29: {
   30:         char *d = dst;
   31:         const char *s = src;
   32:         size_t n = siz;
   33: 
   34:         /* Copy as many bytes as will fit */
   35:         if (n != 0) {
   36:                 while (--n != 0) {
   37:                         if ((*d++ = *s++) == '\0')
   38:                                 break;
   39:                 }
   40:         }
   41: 
   42:         /* Not enough room in dst, add NUL and traverse rest of src */
   43:         if (n == 0) {
   44:                 if (siz != 0)
   45:                         *d = '\0';           /* NUL-terminate dst */
   46:                 while (*s++)
   47:                         ;
   48:         }
   49: 
   50:         return(s - src - 1);   /* count does not include NUL */
   51: }