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Annotation of sys/lib/libkern/strlcat.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: strlcat.c,v 1.5 2004/08/07 00:38:33 deraadt 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: #if defined(LIBC_SCCS) && !defined(lint)
        !            20: static char *rcsid = "$OpenBSD: strlcat.c,v 1.5 2004/08/07 00:38:33 deraadt Exp $";
        !            21: #endif /* LIBC_SCCS and not lint */
        !            22:
        !            23: #if !defined(_KERNEL) && !defined(_STANDALONE)
        !            24: #include <sys/types.h>
        !            25: #include <string.h>
        !            26: #else
        !            27: #include <lib/libkern/libkern.h>
        !            28: #endif
        !            29:
        !            30: /*
        !            31:  * Appends src to string dst of size siz (unlike strncat, siz is the
        !            32:  * full size of dst, not space left).  At most siz-1 characters
        !            33:  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
        !            34:  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
        !            35:  * If retval >= siz, truncation occurred.
        !            36:  */
        !            37: size_t
        !            38: strlcat(char *dst, const char *src, size_t siz)
        !            39: {
        !            40:        char *d = dst;
        !            41:        const char *s = src;
        !            42:        size_t n = siz;
        !            43:        size_t dlen;
        !            44:
        !            45:        /* Find the end of dst and adjust bytes left but don't go past end */
        !            46:        while (n-- != 0 && *d != '\0')
        !            47:                d++;
        !            48:        dlen = d - dst;
        !            49:        n = siz - dlen;
        !            50:
        !            51:        if (n == 0)
        !            52:                return(dlen + strlen(s));
        !            53:        while (*s != '\0') {
        !            54:                if (n != 1) {
        !            55:                        *d++ = *s;
        !            56:                        n--;
        !            57:                }
        !            58:                s++;
        !            59:        }
        !            60:        *d = '\0';
        !            61:
        !            62:        return(dlen + (s - src));       /* count does not include NUL */
        !            63: }