string/strings.h

   1 /* Copyright (C) 1991,92,96,97,99,2000,2001,2009 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _STRINGS_H
  20 #define _STRINGS_H      1
  21
  22 /* We don't need and should not read this file if <string.h> was already
  23    read. The one exception being that if __USE_BSD isn't defined, then
  24    these aren't defined in string.h, so we need to define them here.  */
  25 #if !defined _STRING_H || !defined __USE_BSD
  26
  27 # include <features.h>
  28 # define __need_size_t
  29 # include <stddef.h>
  30
  31 /* Tell the caller that we provide correct C++ prototypes.  */
  32 # if defined __cplusplus && __GNUC_PREREQ (4, 4)
  33 #  define __CORRECT_ISO_CPP_STRINGS_H_PROTO
  34 # endif
  35
  36 __BEGIN_DECLS
  37
  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 /* Return the position of the first bit set in I, or 0 if none are set.
  49    The least-significant bit is position 1, the most-significant 32.  */
  50 extern int ffs (int __i) __THROW __attribute__ ((const));
  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
 108 /* Compare S1 and S2, ignoring case.  */
 109 extern int strcasecmp (__const char *__s1, __const char *__s2)
 110      __THROW __attribute_pure__;
 111
 112 /* Compare no more than N chars of S1 and S2, ignoring case.  */
 113 extern int strncasecmp (__const char *__s1, __const char *__s2, size_t __n)
 114      __THROW __attribute_pure__;
 115
 116 #ifdef  __USE_XOPEN2K8
 117 /* The following functions are equivalent to the both above but they
 118    take the locale they use for the collation as an extra argument.
 119    This is not standardsized but something like will come.  */
 120 # include <xlocale.h>
 121
 122 /* Again versions of a few functions which use the given locale instead
 123    of the global one.  */
 124 extern int strcasecmp_l (__const char *__s1, __const char *__s2,
 125                          __locale_t __loc)
 126      __THROW __attribute_pure__ __nonnull ((1, 2, 3));
 127
 128 extern int strncasecmp_l (__const char *__s1, __const char *__s2,
 129                           size_t __n, __locale_t __loc)
 130      __THROW __attribute_pure__ __nonnull ((1, 2, 4));
 131 #endif
 132
 133 __END_DECLS
 134
 135 #endif  /* string.h  */
 136
 137 #endif  /* strings.h  */