| 1 | #ifndef CONFIG_STRLCAT |
| 2 | /* |
| 3 | * Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com> |
| 4 | * |
| 5 | * Permission to use, copy, modify, and distribute this software for any |
| 6 | * purpose with or without fee is hereby granted, provided that the above |
| 7 | * copyright notice and this permission notice appear in all copies. |
| 8 | * |
| 9 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 15 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 16 | */ |
| 17 | |
| 18 | #include <sys/types.h> |
| 19 | #include <string.h> |
| 20 | #include "strlcat.h" |
| 21 | |
| 22 | /* |
| 23 | * Appends src to string dst of size dsize (unlike strncat, dsize is the |
| 24 | * full size of dst, not space left). At most dsize-1 characters |
| 25 | * will be copied. Always NUL terminates (unless dsize <= strlen(dst)). |
| 26 | * Returns strlen(src) + MIN(dsize, strlen(initial dst)). |
| 27 | * If retval >= dsize, truncation occurred. |
| 28 | */ |
| 29 | size_t |
| 30 | strlcat(char *dst, const char *src, size_t dsize) |
| 31 | { |
| 32 | const char *odst = dst; |
| 33 | const char *osrc = src; |
| 34 | size_t n = dsize; |
| 35 | size_t dlen; |
| 36 | |
| 37 | /* Find the end of dst and adjust bytes left but don't go past end. */ |
| 38 | while (n-- != 0 && *dst != '\0') |
| 39 | dst++; |
| 40 | dlen = dst - odst; |
| 41 | n = dsize - dlen; |
| 42 | |
| 43 | if (n-- == 0) |
| 44 | return(dlen + strlen(src)); |
| 45 | while (*src != '\0') { |
| 46 | if (n != 0) { |
| 47 | *dst++ = *src; |
| 48 | n--; |
| 49 | } |
| 50 | src++; |
| 51 | } |
| 52 | *dst = '\0'; |
| 53 | |
| 54 | return(dlen + (src - osrc)); /* count does not include NUL */ |
| 55 | } |
| 56 | |
| 57 | #endif |