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Member "libpcap-1.9.1/./missing/strlcat.c" (30 Sep 2019, 1848 Bytes) of package /linux/misc/libpcap-1.9.1.tar.gz:


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    1 /*  $OpenBSD: pcap_strlcat.c,v 1.15 2015/03/02 21:41:08 millert Exp $   */
    2 
    3 /*
    4  * Copyright (c) 1998, 2015 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 #ifdef HAVE_CONFIG_H
   20 #include <config.h>
   21 #endif
   22 
   23 #include <stddef.h>
   24 #include <string.h>
   25 
   26 #include "portability.h"
   27 
   28 /*
   29  * Appends src to string dst of size dsize (unlike strncat, dsize is the
   30  * full size of dst, not space left).  At most dsize-1 characters
   31  * will be copied.  Always NUL terminates (unless dsize <= strlen(dst)).
   32  * Returns strlen(src) + MIN(dsize, strlen(initial dst)).
   33  * If retval >= dsize, truncation occurred.
   34  */
   35 size_t
   36 pcap_strlcat(char * restrict dst, const char * restrict src, size_t dsize)
   37 {
   38     const char *odst = dst;
   39     const char *osrc = src;
   40     size_t n = dsize;
   41     size_t dlen;
   42 
   43     /* Find the end of dst and adjust bytes left but don't go past end. */
   44     while (n-- != 0 && *dst != '\0')
   45         dst++;
   46     dlen = dst - odst;
   47     n = dsize - dlen;
   48 
   49     if (n-- == 0)
   50         return(dlen + strlen(src));
   51     while (*src != '\0') {
   52         if (n != 0) {
   53             *dst++ = *src;
   54             n--;
   55         }
   56         src++;
   57     }
   58     *dst = '\0';
   59 
   60     return(dlen + (src - osrc));    /* count does not include NUL */
   61 }