1 /* $NetBSD: strlcat.c,v 1.3 2007/06/04 18:19:27 christos Exp $ */ 2 /* $OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp $ */ 3 4 /* 5 * Copyright (c) 1998 Todd C. Miller <Todd.Miller (at) courtesan.com> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL 12 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 13 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE 14 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 16 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 17 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 #include <LibConfig.h> 20 21 #if !defined(_KERNEL) && !defined(_STANDALONE) 22 #if HAVE_NBTOOL_CONFIG_H 23 #include "nbtool_config.h" 24 #endif 25 26 #include <sys/cdefs.h> 27 #if defined(LIBC_SCCS) && !defined(lint) 28 __RCSID("$NetBSD: strlcat.c,v 1.3 2007/06/04 18:19:27 christos Exp $"); 29 #endif /* LIBC_SCCS and not lint */ 30 31 #ifdef _LIBC 32 #include "namespace.h" 33 #endif 34 #include <sys/types.h> 35 #include <assert.h> 36 #include <string.h> 37 38 #ifdef _LIBC 39 # ifdef __weak_alias 40 __weak_alias(strlcat, _strlcat) 41 # endif 42 #endif 43 44 #else 45 #include <lib/libkern/libkern.h> 46 #endif /* !_KERNEL && !_STANDALONE */ 47 48 #ifndef HAVE_STRLCAT 49 /* 50 * Appends src to string dst of size siz (unlike strncat, siz is the 51 * full size of dst, not space left). At most siz-1 characters 52 * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 53 * Returns strlen(src) + MIN(siz, strlen(initial dst)). 54 * If retval >= siz, truncation occurred. 55 */ 56 size_t 57 strlcat(char *dst, const char *src, size_t siz) 58 { 59 char *d = dst; 60 const char *s = src; 61 size_t n = siz; 62 size_t dlen; 63 64 _DIAGASSERT(dst != NULL); 65 _DIAGASSERT(src != NULL); 66 67 /* Find the end of dst and adjust bytes left but don't go past end */ 68 while (n-- != 0 && *d != '\0') 69 d++; 70 dlen = d - dst; 71 n = siz - dlen; 72 73 if (n == 0) 74 return(dlen + strlen(s)); 75 while (*s != '\0') { 76 if (n != 1) { 77 *d++ = *s; 78 n--; 79 } 80 s++; 81 } 82 *d = '\0'; 83 84 return(dlen + (s - src)); /* count does not include NUL */ 85 } 86 #endif 87
