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       1                 :             : /*
       2                 :             :  * src/port/strlcat.c
       3                 :             :  *
       4                 :             :  *  $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $
       5                 :             :  */
       6                 :             : 
       7                 :             : /*
       8                 :             :  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
       9                 :             :  *
      10                 :             :  * Permission to use, copy, modify, and distribute this software for any
      11                 :             :  * purpose with or without fee is hereby granted, provided that the above
      12                 :             :  * copyright notice and this permission notice appear in all copies.
      13                 :             :  *
      14                 :             :  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      15                 :             :  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      16                 :             :  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
      17                 :             :  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      18                 :             :  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
      19                 :             :  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
      20                 :             :  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
      21                 :             :  */
      22                 :             : 
      23                 :             : #include "c.h"
      24                 :             : 
      25                 :             : 
      26                 :             : /*
      27                 :             :  * Appends src to string dst of size siz (unlike strncat, siz is the
      28                 :             :  * full size of dst, not space left).  At most siz-1 characters
      29                 :             :  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
      30                 :             :  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
      31                 :             :  * If retval >= siz, truncation occurred.
      32                 :             :  */
      33                 :             : size_t
      34                 :             : strlcat(char *dst, const char *src, size_t siz)
      35                 :             : {
      36                 :        5080 :     char       *d = dst;
      37                 :        5080 :     const char *s = src;
      38                 :        5080 :     size_t      n = siz;
      39                 :             :     size_t      dlen;
      40                 :             : 
      41                 :             :     /* Find the end of dst and adjust bytes left but don't go past end */
      42   [ +  -  +  + ]:       98089 :     while (n-- != 0 && *d != '\0')
      43                 :       93009 :         d++;
      44                 :        5080 :     dlen = d - dst;
      45                 :        5080 :     n = siz - dlen;
      46                 :             : 
      47         [ -  + ]:        5080 :     if (n == 0)
      48                 :           0 :         return (dlen + strlen(s));
      49         [ +  + ]:       57227 :     while (*s != '\0')
      50                 :             :     {
      51         [ +  - ]:       52147 :         if (n != 1)
      52                 :             :         {
      53                 :       52147 :             *d++ = *s;
      54                 :       52147 :             n--;
      55                 :             :         }
      56                 :       52147 :         s++;
      57                 :             :     }
      58                 :        5080 :     *d = '\0';
      59                 :             : 
      60                 :        5080 :     return (dlen + (s - src));  /* count does not include NUL */
      61                 :             : }