1 /* $NetBSD: string.c,v 1.1 2024/02/18 20:57:50 christos Exp $ */ 2 3 /* 4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC") 5 * 6 * SPDX-License-Identifier: MPL-2.0 7 * 8 * This Source Code Form is subject to the terms of the Mozilla Public 9 * License, v. 2.0. If a copy of the MPL was not distributed with this 10 * file, you can obtain one at https://mozilla.org/MPL/2.0/. 11 * 12 * See the COPYRIGHT file distributed with this work for additional 13 * information regarding copyright ownership. 14 */ 15 16 /* 17 * SPDX-License-Identifier: BSD-3-Clause 18 * 19 * Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org> 20 * Copyright (c) 1990, 1993 21 * The Regents of the University of California. All rights reserved. 22 * 23 * This code is derived from software contributed to Berkeley by 24 * Chris Torek. 25 * 26 * Redistribution and use in source and binary forms, with or without 27 * modification, are permitted provided that the following conditions 28 * are met: 29 * 1. Redistributions of source code must retain the above copyright 30 * notice, this list of conditions and the following disclaimer. 31 * 2. Redistributions in binary form must reproduce the above copyright 32 * notice, this list of conditions and the following disclaimer in the 33 * documentation and/or other materials provided with the distribution. 34 * 3. Neither the name of the University nor the names of its contributors 35 * may be used to endorse or promote products derived from this software 36 * without specific prior written permission. 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 39 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 41 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 42 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 43 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 44 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 46 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 47 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 */ 50 51 /*! \file */ 52 53 #ifdef _GNU_SOURCE 54 #undef _GNU_SOURCE 55 #endif /* ifdef _GNU_SOURCE */ 56 #include <string.h> 57 58 #include <isc/string.h> /* IWYU pragma: keep */ 59 #include <isc/util.h> 60 61 #if !defined(HAVE_STRLCPY) 62 size_t 63 strlcpy(char *dst, const char *src, size_t size) { 64 char *d = dst; 65 const char *s = src; 66 size_t n = size; 67 68 /* Copy as many bytes as will fit */ 69 if (n != 0U && --n != 0U) { 70 do { 71 if ((*d++ = *s++) == 0) { 72 break; 73 } 74 } while (--n != 0U); 75 } 76 77 /* Not enough room in dst, add NUL and traverse rest of src */ 78 if (n == 0U) { 79 if (size != 0U) { 80 *d = '\0'; /* NUL-terminate dst */ 81 } 82 while (*s++) { 83 } 84 } 85 86 return (s - src - 1); /* count does not include NUL */ 87 } 88 #endif /* !defined(HAVE_STRLCPY) */ 89 90 #if !defined(HAVE_STRLCAT) 91 size_t 92 strlcat(char *dst, const char *src, size_t size) { 93 char *d = dst; 94 const char *s = src; 95 size_t n = size; 96 size_t dlen; 97 98 /* Find the end of dst and adjust bytes left but don't go past end */ 99 while (n-- != 0U && *d != '\0') { 100 d++; 101 } 102 dlen = d - dst; 103 n = size - dlen; 104 105 if (n == 0U) { 106 return (dlen + strlen(s)); 107 } 108 while (*s != '\0') { 109 if (n != 1U) { 110 *d++ = *s; 111 n--; 112 } 113 s++; 114 } 115 *d = '\0'; 116 117 return (dlen + (s - src)); /* count does not include NUL */ 118 } 119 #endif /* !defined(HAVE_STRLCAT) */ 120 121 #if !defined(HAVE_STRNSTR) 122 char * 123 strnstr(const char *s, const char *find, size_t slen) { 124 char c, sc, *r; 125 size_t len; 126 127 if ((c = *find++) != '\0') { 128 len = strlen(find); 129 do { 130 do { 131 if (slen-- < 1 || (sc = *s++) == '\0') 132 return (NULL); 133 } while (sc != c); 134 if (len > slen) 135 return (NULL); 136 } while (strncmp(s, find, len) != 0); 137 s--; 138 } 139 DE_CONST(s, r); 140 return (r); 141 } 142 #endif 143 144 int 145 isc_string_strerror_r(int errnum, char *buf, size_t buflen) { 146 #if defined(_WIN32) || defined(_WIN64) 147 return (strerror_s(buf, buflen, errnum)); 148 #else /* if defined(_WIN32) || defined(_WIN64) */ 149 return (strerror_r(errnum, buf, buflen)); 150 #endif /* if defined(_WIN32) || defined(_WIN64) */ 151 } 152