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Member "file-5.35/src/strlcat.c" (20 Jun 2012, 1752 Bytes) of package /linux/misc/file-5.35.tar.gz:


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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 #include "file.h"
   21 
   22 #include <sys/types.h>
   23 #include <string.h>
   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 strlcat(char *dst, const char *src, size_t siz)
   34 {
   35     char *d = dst;
   36     const char *s = src;
   37     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     while (n-- != 0 && *d != '\0')
   42         d++;
   43     dlen = d - dst;
   44     n = siz - dlen;
   45 
   46     if (n == 0)
   47         return(dlen + strlen(s));
   48     while (*s != '\0') {
   49         if (n != 1) {
   50             *d++ = *s;
   51             n--;
   52         }
   53         s++;
   54     }
   55     *d = '\0';
   56 
   57     return(dlen + (s - src));   /* count does not include NUL */
   58 }