1/* Copyright (C) 1991-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#ifndef _STRINGS_H
19#define _STRINGS_H 1
20
21#include <features.h>
22#define __need_size_t
23#include <stddef.h>
24
25/* Tell the caller that we provide correct C++ prototypes. */
26#if defined __cplusplus && __GNUC_PREREQ (4, 4)
27# define __CORRECT_ISO_CPP_STRINGS_H_PROTO
28#endif
29
30__BEGIN_DECLS
31
32#if defined __USE_MISC || !defined __USE_XOPEN2K8
33/* Compare N bytes of S1 and S2 (same as memcmp). */
34extern int bcmp (const void *__s1, const void *__s2, size_t __n)
35 __THROW __attribute_pure__ __nonnull ((1, 2));
36
37/* Copy N bytes of SRC to DEST (like memmove, but args reversed). */
38extern void bcopy (const void *__src, void *__dest, size_t __n)
39 __THROW __nonnull ((1, 2));
40
41/* Set N bytes of S to 0. */
42extern void bzero (void *__s, size_t __n) __THROW __nonnull ((1));
43
44/* Find the first occurrence of C in S (same as strchr). */
45# ifdef __CORRECT_ISO_CPP_STRINGS_H_PROTO
46extern "C++"
47{
48extern char *index (char *__s, int __c)
49 __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
50extern const char *index (const char *__s, int __c)
51 __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
52
53# if defined __OPTIMIZE__
54__extern_always_inline char *
55index (char *__s, int __c) __THROW
56{
57 return __builtin_index (__s, __c);
58}
59
60__extern_always_inline const char *
61index (const char *__s, int __c) __THROW
62{
63 return __builtin_index (__s, __c);
64}
65# endif
66}
67# else
68extern char *index (const char *__s, int __c)
69 __THROW __attribute_pure__ __nonnull ((1));
70# endif
71
72/* Find the last occurrence of C in S (same as strrchr). */
73# ifdef __CORRECT_ISO_CPP_STRINGS_H_PROTO
74extern "C++"
75{
76extern char *rindex (char *__s, int __c)
77 __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
78extern const char *rindex (const char *__s, int __c)
79 __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
80
81# if defined __OPTIMIZE__
82__extern_always_inline char *
83rindex (char *__s, int __c) __THROW
84{
85 return __builtin_rindex (__s, __c);
86}
87
88__extern_always_inline const char *
89rindex (const char *__s, int __c) __THROW
90{
91 return __builtin_rindex (__s, __c);
92}
93# endif
94}
95# else
96extern char *rindex (const char *__s, int __c)
97 __THROW __attribute_pure__ __nonnull ((1));
98# endif
99#endif
100
101#if defined __USE_MISC || !defined __USE_XOPEN2K8 || defined __USE_XOPEN2K8XSI
102/* Return the position of the first bit set in I, or 0 if none are set.
103 The least-significant bit is position 1, the most-significant 32. */
104extern int ffs (int __i) __THROW __attribute_const__;
105#endif
106
107/* The following two functions are non-standard but necessary for non-32 bit
108 platforms. */
109# ifdef __USE_MISC
110extern int ffsl (long int __l) __THROW __attribute_const__;
111__extension__ extern int ffsll (long long int __ll)
112 __THROW __attribute_const__;
113# endif
114
115/* Compare S1 and S2, ignoring case. */
116extern int strcasecmp (const char *__s1, const char *__s2)
117 __THROW __attribute_pure__ __nonnull ((1, 2));
118
119/* Compare no more than N chars of S1 and S2, ignoring case. */
120extern int strncasecmp (const char *__s1, const char *__s2, size_t __n)
121 __THROW __attribute_pure__ __nonnull ((1, 2));
122
123#ifdef __USE_XOPEN2K8
124/* POSIX.1-2008 extended locale interface (see locale.h). */
125# include <bits/types/locale_t.h>
126
127/* Compare S1 and S2, ignoring case, using collation rules from LOC. */
128extern int strcasecmp_l (const char *__s1, const char *__s2, locale_t __loc)
129 __THROW __attribute_pure__ __nonnull ((1, 2, 3));
130
131/* Compare no more than N chars of S1 and S2, ignoring case, using
132 collation rules from LOC. */
133extern int strncasecmp_l (const char *__s1, const char *__s2,
134 size_t __n, locale_t __loc)
135 __THROW __attribute_pure__ __nonnull ((1, 2, 4));
136#endif
137
138__END_DECLS
139
140#if __GNUC_PREREQ (3,4) && __USE_FORTIFY_LEVEL > 0 \
141 && defined __fortify_function
142/* Functions with security checks. */
143# if defined __USE_MISC || !defined __USE_XOPEN2K8
144# include <bits/strings_fortified.h>
145# endif
146#endif
147
148#endif /* strings.h */
149