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Annotation of sys/lib/libkern/strlcat.c, Revision 1.1.1.1

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: }