| /* $OpenBSD: strlcat.c,v 1.16 2015/08/31 02:53:57 guenther Exp $ */ |
| |
| /* |
| * Copyright (c) 1998, 2015 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 <string.h> |
| #include <sys/types.h> |
| |
| /* |
| * Appends src to string dst of size dsize (unlike strncat, dsize is the |
| * full size of dst, not space left). At most dsize-1 characters |
| * will be copied. Always NUL terminates (unless dsize <= strlen(dst)). |
| * Returns strlen(src) + MIN(dsize, strlen(initial dst)). |
| * If retval >= dsize, truncation occurred. |
| */ |
| size_t __strlcat(char *dst, const char *src, size_t dsize) |
| { |
| const char *odst = dst; |
| const char *osrc = src; |
| size_t n = dsize; |
| size_t dlen; |
| |
| /* Find the end of dst and adjust bytes left but don't go past end. */ |
| while (n-- != 0 && *dst != '\0') |
| dst++; |
| dlen = dst - odst; |
| n = dsize - dlen; |
| |
| if (n-- == 0) |
| return (dlen + strlen(src)); |
| while (*src != '\0') { |
| if (n != 0) { |
| *dst++ = *src; |
| n--; |
| } |
| src++; |
| } |
| *dst = '\0'; |
| |
| return (dlen + (src - osrc)); /* count does not include NUL */ |
| } |
| weak_alias(__strlcat, strlcat) |
