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Annotation of embedaddon/sudo/compat/strlcat.c, revision 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: }