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Annotation of embedaddon/sudo/compat/strlcat.c, revision 1.1.1.1

1.1       misho       1: /*     $OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $     */
                      2: 
                      3: /*
                      4:  * Copyright (c) 1998, 2003-2005, 2010-2011
                      5:  *     Todd C. Miller <Todd.Miller@courtesan.com>
                      6:  *
                      7:  * Permission to use, copy, modify, and distribute this software for any
                      8:  * purpose with or without fee is hereby granted, provided that the above
                      9:  * copyright notice and this permission notice appear in all copies.
                     10:  *
                     11:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     12:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     13:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     14:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     15:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     16:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     17:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     18:  */
                     19: 
                     20: #include <config.h>
                     21: 
                     22: #include <sys/types.h>
                     23: #include <string.h>
                     24: 
                     25: #include "missing.h"
                     26: 
                     27: /*
                     28:  * Appends src to string dst of size siz (unlike strncat, siz is the
                     29:  * full size of dst, not space left).  At most siz-1 characters
                     30:  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
                     31:  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
                     32:  * If retval >= siz, truncation occurred.
                     33:  */
                     34: size_t
                     35: strlcat(char *dst, const char *src, size_t siz)
                     36: {
                     37:        char *d = dst;
                     38:        const char *s = src;
                     39:        size_t n = siz;
                     40:        size_t dlen;
                     41: 
                     42:        /* Find the end of dst and adjust bytes left but don't go past end */
                     43:        while (n-- != 0 && *d != '\0')
                     44:                d++;
                     45:        dlen = d - dst;
                     46:        n = siz - dlen;
                     47: 
                     48:        if (n == 0)
                     49:                return dlen + strlen(s);
                     50:        while (*s != '\0') {
                     51:                if (n != 1) {
                     52:                        *d++ = *s;
                     53:                        n--;
                     54:                }
                     55:                s++;
                     56:        }
                     57:        *d = '\0';
                     58: 
                     59:        return dlen + (s - src);        /* count does not include NUL */
                     60: }