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
strlcpy(char * dst,const char * src,size_t size)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
strlcat(char * dst,const char * src,size_t size)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 *
strnstr(const char * s,const char * find,size_t slen)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
isc_string_strerror_r(int errnum,char * buf,size_t buflen)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