strlcat.c
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上传日期:2018-01-22
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- /*
- * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
- #include <sys/types.h>
- #include <string.h>
- /*
- * Appends src to string dst of size siz (unlike strncat, siz is the
- * full size of dst, not space left). At most siz-1 characters
- * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
- * Returns strlen(src) + MIN(siz, strlen(initial dst)).
- * If retval >= siz, truncation occurred.
- */
- size_t strlcat(char *dst, const char *src, size_t siz)
- {
- register char *d = dst;
- register const char *s = src;
- register size_t n = siz;
- size_t dlen;
- /* Find the end of dst and adjust bytes left but don't go past end */
- while (n-- != 0 && *d != ' ')
- d++;
- dlen = d - dst;
- n = siz - dlen;
- if (n == 0)
- return (dlen + strlen(s));
- while (*s != ' ') {
- if (n != 1) {
- *d++ = *s;
- n--;
- }
- s++;
- }
- *d = ' ';
- return (dlen + (s - src)); /* count does not include NUL */
- }