include/strings.h

   1 /* Copyright (C) 1991-2021 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).  */
  34 extern 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).  */
  38 extern void bcopy (const void *__src, void *__dest, size_t __n)
  39   __THROW __nonnull ((1, 2));
  40
  41 /* Set N bytes of S to 0.  */
  42 extern 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
  46 extern "C++"
  47 {
  48 extern char *index (char *__s, int __c)
  49      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
  50 extern 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 *
  55 index (char *__s, int __c) __THROW
  56 {
  57   return __builtin_index (__s, __c);
  58 }
  59
  60 __extern_always_inline const char *
  61 index (const char *__s, int __c) __THROW
  62 {
  63   return __builtin_index (__s, __c);
  64 }
  65 #  endif
  66 }
  67 # else
  68 extern 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
  74 extern "C++"
  75 {
  76 extern char *rindex (char *__s, int __c)
  77      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
  78 extern 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 *
  83 rindex (char *__s, int __c) __THROW
  84 {
  85   return __builtin_rindex (__s, __c);
  86 }
  87
  88 __extern_always_inline const char *
  89 rindex (const char *__s, int __c) __THROW
  90 {
  91   return __builtin_rindex (__s, __c);
  92 }
  93 #  endif
  94 }
  95 # else
  96 extern 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.  */
 104 extern 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
 110 extern 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.  */
 116 extern 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.  */
 120 extern 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.  */
 128 extern 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.  */
 133 extern 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  */