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       1                 :            : /*      $OpenBSD: strlcat.c,v 1.13 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                 :            : /* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */
      20                 :            : 
      21                 :            : #include "includes.h"
      22                 :            : #ifndef HAVE_STRLCAT
      23                 :            : 
      24                 :            : #include <sys/types.h>
      25                 :            : #include <string.h>
      26                 :            : 
      27                 :            : /*
      28                 :            :  * Appends src to string dst of size siz (unlike strncat, siz is the
      29                 :            :  * full size of dst, not space left).  At most siz-1 characters
      30                 :            :  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
      31                 :            :  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
      32                 :            :  * If retval >= siz, truncation occurred.
      33                 :            :  */
      34                 :            : size_t
      35                 :     134717 : strlcat(char *dst, const char *src, size_t siz)
      36                 :            : {
      37                 :     134717 :         char *d = dst;
      38                 :     134717 :         const char *s = src;
      39                 :     134717 :         size_t n = siz;
      40                 :            :         size_t dlen;
      41                 :            : 
      42                 :            :         /* Find the end of dst and adjust bytes left but don't go past end */
      43 [ +  - ][ +  + ]:    5565581 :         while (n-- != 0 && *d != '\0')
      44                 :    5430864 :                 d++;
      45                 :     134717 :         dlen = d - dst;
      46                 :     134717 :         n = siz - dlen;
      47                 :            : 
      48         [ +  - ]:     134717 :         if (n == 0)
      49                 :          0 :                 return(dlen + strlen(s));
      50         [ +  + ]:     743330 :         while (*s != '\0') {
      51         [ +  - ]:     608613 :                 if (n != 1) {
      52                 :     608613 :                         *d++ = *s;
      53                 :     608613 :                         n--;
      54                 :            :                 }
      55                 :     608613 :                 s++;
      56                 :            :         }
      57                 :     134717 :         *d = '\0';
      58                 :            : 
      59                 :     134717 :         return(dlen + (s - src));       /* count does not include NUL */
      60                 :            : }
      61                 :            : 
      62                 :            : #endif /* !HAVE_STRLCAT */