string/strings.h

   1 /* Copyright (C) 1991-2014 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    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _STRINGS_H
  19 #define _STRINGS_H      1
  20
  21 /* We don't need and should not read this file if <string.h> was already
  22    read. The one exception being that if __USE_BSD isn't defined, then
  23    these aren't defined in string.h, so we need to define them here.  */
  24 #if !defined _STRING_H || !defined __USE_BSD
  25
  26 # include <features.h>
  27 # define __need_size_t
  28 # include <stddef.h>
  29
  30 /* Provide correct C++ prototypes, and indicate this to the caller.  This
  31    requires a compatible C++ standard library.  As a heuristic, we provide
  32    these when the compiler indicates full conformance with C++98 or later,
  33    and for older GCC versions that are known to provide a compatible
  34    libstdc++.  */
  35 # if defined __cplusplus && (__cplusplus >= 199711L || __GNUC_PREREQ (4, 4))
  36 #  define __CORRECT_ISO_CPP_STRINGS_H_PROTO
  37 # endif
  38
  39 __BEGIN_DECLS
  40
  41 # if defined __USE_MISC || !defined __USE_XOPEN2K8
  42 /* Compare N bytes of S1 and S2 (same as memcmp).  */
  43 extern int bcmp (const void *__s1, const void *__s2, size_t __n)
  44      __THROW __attribute_pure__;
  45
  46 /* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
  47 extern void bcopy (const void *__src, void *__dest, size_t __n) __THROW;
  48
  49 /* Set N bytes of S to 0.  */
  50 extern void bzero (void *__s, size_t __n) __THROW;
  51
  52 /* Find the first occurrence of C in S (same as strchr).  */
  53 #  ifdef __CORRECT_ISO_CPP_STRINGS_H_PROTO
  54 extern "C++"
  55 {
  56 extern char *index (char *__s, int __c)
  57      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
  58 extern const char *index (const char *__s, int __c)
  59      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
  60
  61 #   if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRING_H_PROTO
  62 __extern_always_inline char *
  63 index (char *__s, int __c) __THROW
  64 {
  65   return __builtin_index (__s, __c);
  66 }
  67
  68 __extern_always_inline const char *
  69 index (const char *__s, int __c) __THROW
  70 {
  71   return __builtin_index (__s, __c);
  72 }
  73 #   endif
  74 }
  75 #  else
  76 extern char *index (const char *__s, int __c)
  77      __THROW __attribute_pure__ __nonnull ((1));
  78 #  endif
  79
  80 /* Find the last occurrence of C in S (same as strrchr).  */
  81 #  ifdef __CORRECT_ISO_CPP_STRINGS_H_PROTO
  82 extern "C++"
  83 {
  84 extern char *rindex (char *__s, int __c)
  85      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
  86 extern const char *rindex (const char *__s, int __c)
  87      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
  88
  89 #   if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRING_H_PROTO
  90 __extern_always_inline char *
  91 rindex (char *__s, int __c) __THROW
  92 {
  93   return __builtin_rindex (__s, __c);
  94 }
  95
  96 __extern_always_inline const char *
  97 rindex (const char *__s, int __c) __THROW
  98 {
  99   return __builtin_rindex (__s, __c);
 100 }
 101 #   endif
 102 }
 103 #  else
 104 extern char *rindex (const char *__s, int __c)
 105      __THROW __attribute_pure__ __nonnull ((1));
 106 #  endif
 107 # endif
 108
 109 #if defined __USE_MISC || !defined __USE_XOPEN2K8 || defined __USE_XOPEN2K8XSI
 110 /* Return the position of the first bit set in I, or 0 if none are set.
 111    The least-significant bit is position 1, the most-significant 32.  */
 112 extern int ffs (int __i) __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__;
 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__;
 122
 123 #ifdef  __USE_XOPEN2K8
 124 /* The following functions are equivalent to the both above but they
 125    take the locale they use for the collation as an extra argument.
 126    This is not standardsized but something like will come.  */
 127 # include <xlocale.h>
 128
 129 /* Again versions of a few functions which use the given locale instead
 130    of the global one.  */
 131 extern int strcasecmp_l (const char *__s1, const char *__s2, __locale_t __loc)
 132      __THROW __attribute_pure__ __nonnull ((1, 2, 3));
 133
 134 extern int strncasecmp_l (const char *__s1, const char *__s2,
 135                           size_t __n, __locale_t __loc)
 136      __THROW __attribute_pure__ __nonnull ((1, 2, 4));
 137 #endif
 138
 139 __END_DECLS
 140
 141 #endif  /* string.h  */
 142
 143 #endif  /* strings.h  */