TLA  Line data    Source code

       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                 :  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
       8                 :  *
       9                 :  * Permission to use, copy, modify, and distribute this software for any
      10                 :  * purpose with or without fee is hereby granted, provided that the above
      11                 :  * copyright notice and this permission notice appear in all copies.
      12                 :  *
      13                 :  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      14                 :  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      15                 :  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
      16                 :  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      17                 :  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
      18                 :  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
      19                 :  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
      20                 :  */
      21                 : 
      22                 : #include "c.h"
      23                 : 
      24                 : 
      25                 : /*
      26                 :  * Appends src to string dst of size siz (unlike strncat, siz is the
      27                 :  * full size of dst, not space left).  At most siz-1 characters
      28                 :  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
      29                 :  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
      30                 :  * If retval >= siz, truncation occurred.
      31                 :  */
      32                 : size_t
      33 CBC        1861 : strlcat(char *dst, const char *src, size_t siz)
      34                 : {
      35            1861 :     char       *d = dst;
      36            1861 :     const char *s = src;
      37            1861 :     size_t      n = siz;
      38                 :     size_t      dlen;
      39                 : 
      40                 :     /* Find the end of dst and adjust bytes left but don't go past end */
      41          167487 :     while (n-- != 0 && *d != '\0')
      42          165626 :         d++;
      43            1861 :     dlen = d - dst;
      44            1861 :     n = siz - dlen;
      45                 : 
      46            1861 :     if (n == 0)
      47 UBC           0 :         return (dlen + strlen(s));
      48 CBC       12724 :     while (*s != '\0')
      49                 :     {
      50           10863 :         if (n != 1)
      51                 :         {
      52           10863 :             *d++ = *s;
      53           10863 :             n--;
      54                 :         }
      55           10863 :         s++;
      56                 :     }
      57            1861 :     *d = '\0';
      58                 : 
      59            1861 :     return (dlen + (s - src));  /* count does not include NUL */
      60                 : }