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       1                 :            : /*
       2                 :            :  *****************************************************************************
       3                 :            :  *
       4                 :            :  * File:    strlcat.c
       5                 :            :  *
       6                 :            :  * Purpose: Safer string concat routine.
       7                 :            :  *
       8                 :            :  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
       9                 :            :  * All rights reserved.
      10                 :            :  *
      11                 :            :  * Redistribution and use in source and binary forms, with or without
      12                 :            :  * modification, are permitted provided that the following conditions
      13                 :            :  * are met:
      14                 :            :  * 1. Redistributions of source code must retain the above copyright
      15                 :            :  *    notice, this list of conditions and the following disclaimer.
      16                 :            :  * 2. Redistributions in binary form must reproduce the above copyright
      17                 :            :  *    notice, this list of conditions and the following disclaimer in the
      18                 :            :  *    documentation and/or other materials provided with the distribution.
      19                 :            :  * 3. The name of the author may not be used to endorse or promote products
      20                 :            :  *    derived from this software without specific prior written permission.
      21                 :            :  *
      22                 :            :  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
      23                 :            :  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
      24                 :            :  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
      25                 :            :  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
      26                 :            :  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
      27                 :            :  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
      28                 :            :  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
      29                 :            :  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
      30                 :            :  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
      31                 :            :  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      32                 :            :  *
      33                 :            :  *****************************************************************************
      34                 :            : */
      35                 :            : #include "fko_common.h"
      36                 :            : 
      37                 :            : #if !HAVE_STRLCAT
      38                 :            : /*
      39                 :            :  * Appends src to string dst of size siz (unlike strncat, siz is the
      40                 :            :  * full size of dst, not space left).  At most siz-1 characters
      41                 :            :  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
      42                 :            :  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
      43                 :            :  * If retval >= siz, truncation occurred.
      44                 :            :  */
      45                 :            : size_t
      46                 :      27313 : strlcat(char *dst, const char *src, size_t siz)
      47                 :            : {
      48                 :      27313 :         register char *d = dst;
      49                 :      27313 :         register const char *s = src;
      50                 :      27313 :         register size_t n = siz;
      51                 :            :         size_t dlen;
      52                 :            : 
      53                 :            :         /* Find the end of dst and adjust bytes left but don't go past end */
      54 [ +  - ][ +  + ]:    2689184 :         while (n-- != 0 && *d != '\0')
      55                 :    2661871 :                 d++;
      56                 :      27313 :         dlen = d - dst;
      57                 :      27313 :         n = siz - dlen;
      58                 :            : 
      59         [ +  - ]:      27313 :         if (n == 0)
      60                 :          0 :                 return(dlen + strlen(s));
      61         [ +  + ]:     394444 :         while (*s != '\0') {
      62         [ +  + ]:     367131 :                 if (n != 1) {
      63                 :     304741 :                         *d++ = *s;
      64                 :     304741 :                         n--;
      65                 :            :                 }
      66                 :     367131 :                 s++;
      67                 :            :         }
      68                 :      27313 :         *d = '\0';
      69                 :            : 
      70                 :      27313 :         return(dlen + (s - src));       /* count does not include NUL */
      71                 :            : }
      72                 :            : #endif
      73                 :            : 
      74                 :            : /***EOF***/