glibc/string/strings.h

/* Copyright (C) 1991-2015 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef	_STRINGS_H
#define	_STRINGS_H	1

/* We don't need and should not read this file if <string.h> was already
   read. The one exception being that if __USE_MISC isn't defined, then
   these aren't defined in string.h, so we need to define them here.  */
#if !defined _STRING_H || !defined __USE_MISC

# include <features.h>
# define __need_size_t
# include <stddef.h>

/* Provide correct C++ prototypes, and indicate this to the caller.  This
   requires a compatible C++ standard library.  As a heuristic, we provide
   these when the compiler indicates full conformance with C++98 or later,
   and for older GCC versions that are known to provide a compatible
   libstdc++.  */
# if defined __cplusplus && (__cplusplus >= 199711L || __GNUC_PREREQ (4, 4))
#  define __CORRECT_ISO_CPP_STRINGS_H_PROTO
# endif

__BEGIN_DECLS

# if defined __USE_MISC || !defined __USE_XOPEN2K8
/* Compare N bytes of S1 and S2 (same as memcmp).  */
extern int bcmp (const void *__s1, const void *__s2, size_t __n)
     __THROW __attribute_pure__;

/* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
extern void bcopy (const void *__src, void *__dest, size_t __n) __THROW;

/* Set N bytes of S to 0.  */
extern void bzero (void *__s, size_t __n) __THROW;

/* Find the first occurrence of C in S (same as strchr).  */
#  ifdef __CORRECT_ISO_CPP_STRINGS_H_PROTO
extern "C++"
{
extern char *index (char *__s, int __c)
     __THROW __asm ("index") __attribute_pure__ __nonnull ((1));
extern const char *index (const char *__s, int __c)
     __THROW __asm ("index") __attribute_pure__ __nonnull ((1));

#   if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRING_H_PROTO
__extern_always_inline char *
index (char *__s, int __c) __THROW
{
  return __builtin_index (__s, __c);
}

__extern_always_inline const char *
index (const char *__s, int __c) __THROW
{
  return __builtin_index (__s, __c);
}
#   endif
}
#  else
extern char *index (const char *__s, int __c)
     __THROW __attribute_pure__ __nonnull ((1));
#  endif

/* Find the last occurrence of C in S (same as strrchr).  */
#  ifdef __CORRECT_ISO_CPP_STRINGS_H_PROTO
extern "C++"
{
extern char *rindex (char *__s, int __c)
     __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));
extern const char *rindex (const char *__s, int __c)
     __THROW __asm ("rindex") __attribute_pure__ __nonnull ((1));

#   if defined __OPTIMIZE__ && !defined __CORRECT_ISO_CPP_STRING_H_PROTO
__extern_always_inline char *
rindex (char *__s, int __c) __THROW
{
  return __builtin_rindex (__s, __c);
}

__extern_always_inline const char *
rindex (const char *__s, int __c) __THROW
{
  return __builtin_rindex (__s, __c);
}
#   endif
}
#  else
extern char *rindex (const char *__s, int __c)
     __THROW __attribute_pure__ __nonnull ((1));
#  endif
# endif

#if defined __USE_MISC || !defined __USE_XOPEN2K8 || defined __USE_XOPEN2K8XSI
/* Return the position of the first bit set in I, or 0 if none are set.
   The least-significant bit is position 1, the most-significant 32.  */
extern int ffs (int __i) __THROW __attribute__ ((const));
#endif

/* Compare S1 and S2, ignoring case.  */
extern int strcasecmp (const char *__s1, const char *__s2)
     __THROW __attribute_pure__;

/* Compare no more than N chars of S1 and S2, ignoring case.  */
extern int strncasecmp (const char *__s1, const char *__s2, size_t __n)
     __THROW __attribute_pure__;

#ifdef	__USE_XOPEN2K8
/* The following functions are equivalent to the both above but they
   take the locale they use for the collation as an extra argument.
   This is not standardsized but something like will come.  */
# include <xlocale.h>

/* Again versions of a few functions which use the given locale instead
   of the global one.  */
extern int strcasecmp_l (const char *__s1, const char *__s2, __locale_t __loc)
     __THROW __attribute_pure__ __nonnull ((1, 2, 3));

extern int strncasecmp_l (const char *__s1, const char *__s2,
			  size_t __n, __locale_t __loc)
     __THROW __attribute_pure__ __nonnull ((1, 2, 4));
#endif

__END_DECLS

#endif	/* string.h  */

#endif	/* strings.h  */