Antonio Nino Diaz | a76dbe3 | 2018-09-27 09:18:57 +0100 | [diff] [blame^] | 1 | /* $OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1998, 2015 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 | #include <sys/cdefs.h> |
| 20 | __FBSDID("$FreeBSD$"); |
| 21 | |
| 22 | #include <sys/types.h> |
| 23 | #include <string.h> |
| 24 | |
| 25 | /* |
| 26 | * Copy string src to buffer dst of size dsize. At most dsize-1 |
| 27 | * chars will be copied. Always NUL terminates (unless dsize == 0). |
| 28 | * Returns strlen(src); if retval >= dsize, truncation occurred. |
| 29 | */ |
| 30 | size_t |
| 31 | strlcpy(char * __restrict dst, const char * __restrict src, size_t dsize) |
| 32 | { |
| 33 | const char *osrc = src; |
| 34 | size_t nleft = dsize; |
| 35 | |
| 36 | /* Copy as many bytes as will fit. */ |
| 37 | if (nleft != 0) { |
| 38 | while (--nleft != 0) { |
| 39 | if ((*dst++ = *src++) == '\0') |
| 40 | break; |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | /* Not enough room in dst, add NUL and traverse rest of src. */ |
| 45 | if (nleft == 0) { |
| 46 | if (dsize != 0) |
| 47 | *dst = '\0'; /* NUL-terminate dst */ |
| 48 | while (*src++) |
| 49 | ; |
| 50 | } |
| 51 | |
| 52 | return(src - osrc - 1); /* count does not include NUL */ |
| 53 | } |