string/strings.h

   1 /* Copyright (C) 1991-2015 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_MISC 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_MISC
  25
  26 # include <features.h>
  27 # define __need_size_t
  28 # include <stddef.h>
  29
  30 /* Tell the caller that we provide correct C++ prototypes.  */
  31 # if defined __cplusplus && __GNUC_PREREQ (4, 4)
  32 #  define __CORRECT_ISO_CPP_STRINGS_H_PROTO
  33 # endif
  34
  35 __BEGIN_DECLS
  36
  37 # if defined __USE_MISC || !defined __USE_XOPEN2K8
  38 /* Compare N bytes of S1 and S2 (same as memcmp).  */
  39 extern int bcmp (const void *__s1, const void *__s2, size_t __n)
  40      __THROW __attribute_pure__;
  41
  42 /* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
  43 extern void bcopy (const void *__src, void *__dest, size_t __n) __THROW;
  44
  45 /* Set N bytes of S to 0.  */
  46 extern void bzero (void *__s, size_t __n) __THROW;
  47
  48 /* Find the first occurrence of C in S (same as strchr).  */
  49 #  ifdef __CORRECT_ISO_CPP_STRINGS_H_PROTO
  50 extern "C++"
  51 {
  52 extern char *index (char *__s, int __c)
  53      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
  54 extern const char *index (const char *__s, int __c)
  55      __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
  56
  57 #   if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRING_H_PROTO
  58 __extern_always_inline char *
  59 index (char *__s, int __c) __THROW
  60 {
  61   return __builtin_index (__s, __c);
  62 }
  63
  64 __extern_always_inline const char *
  65 index (const char *__s, int __c) __THROW
  66 {
  67   return __builtin_index (__s, __c);
  68 }
  69 #   endif
  70 }
  71 #  else
  72 extern char *index (const char *__s, int __c)
  73      __THROW __attribute_pure__ __nonnull ((1));
  74 #  endif
  75
  76 /* Find the last occurrence of C in S (same as strrchr).  */
  77 #  ifdef __CORRECT_ISO_CPP_STRINGS_H_PROTO
  78 extern "C++"
  79 {
  80 extern char *rindex (char *__s, int __c)
  81      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
  82 extern const char *rindex (const char *__s, int __c)
  83      __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
  84
  85 #   if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRING_H_PROTO
  86 __extern_always_inline char *
  87 rindex (char *__s, int __c) __THROW
  88 {
  89   return __builtin_rindex (__s, __c);
  90 }
  91
  92 __extern_always_inline const char *
  93 rindex (const char *__s, int __c) __THROW
  94 {
  95   return __builtin_rindex (__s, __c);
  96 }
  97 #   endif
  98 }
  99 #  else
 100 extern char *rindex (const char *__s, int __c)
 101      __THROW __attribute_pure__ __nonnull ((1));
 102 #  endif
 103 # endif
 104
 105 #if defined __USE_MISC || !defined __USE_XOPEN2K8 || defined __USE_XOPEN2K8XSI
 106 /* Return the position of the first bit set in I, or 0 if none are set.
 107    The least-significant bit is position 1, the most-significant 32.  */
 108 extern int ffs (int __i) __THROW __attribute__ ((const));
 109 #endif
 110
 111 /* Compare S1 and S2, ignoring case.  */
 112 extern int strcasecmp (const char *__s1, const char *__s2)
 113      __THROW __attribute_pure__;
 114
 115 /* Compare no more than N chars of S1 and S2, ignoring case.  */
 116 extern int strncasecmp (const char *__s1, const char *__s2, size_t __n)
 117      __THROW __attribute_pure__;
 118
 119 #ifdef  __USE_XOPEN2K8
 120 /* The following functions are equivalent to the both above but they
 121    take the locale they use for the collation as an extra argument.
 122    This is not standardsized but something like will come.  */
 123 # include <xlocale.h>
 124
 125 /* Again versions of a few functions which use the given locale instead
 126    of the global one.  */
 127 extern int strcasecmp_l (const char *__s1, const char *__s2, __locale_t __loc)
 128      __THROW __attribute_pure__ __nonnull ((1, 2, 3));
 129
 130 extern int strncasecmp_l (const char *__s1, const char *__s2,
 131                           size_t __n, __locale_t __loc)
 132      __THROW __attribute_pure__ __nonnull ((1, 2, 4));
 133 #endif
 134
 135 __END_DECLS
 136
 137 #endif  /* string.h  */
 138
 139 #endif  /* strings.h  */