File: //usr/include/string.h
/* Copyright (C) 1991-2018 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/>. */
/*
* ISO C99 Standard: 7.21 String handling <string.h>
*/
#ifndef _STRING_H
#define _STRING_H 1
#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
#include <bits/libc-header-start.h>
__BEGIN_DECLS
/* Get size_t and NULL from <stddef.h>. */
#define __need_size_t
#define __need_NULL
#include <stddef.h>
/* Tell the caller that we provide correct C++ prototypes. */
#if defined __cplusplus && (__GNUC_PREREQ (4, 4) \
|| __glibc_clang_prereq (3, 5))
# define __CORRECT_ISO_CPP_STRING_H_PROTO
#endif
/* Copy N bytes of SRC to DEST. */
extern void *memcpy (void *__restrict __dest, const void *__restrict __src,
size_t __n) __THROW __nonnull ((1, 2));
/* Copy N bytes of SRC to DEST, guaranteeing
correct behavior for overlapping strings. */
extern void *memmove (void *__dest, const void *__src, size_t __n)
__THROW __nonnull ((1, 2));
/* Copy no more than N bytes of SRC to DEST, stopping when C is found.
Return the position in DEST one byte past where C was copied,
or NULL if C was not found in the first N bytes of SRC. */
#if defined __USE_MISC || defined __USE_XOPEN
extern void *memccpy (void *__restrict __dest, const void *__restrict __src,
int __c, size_t __n)
__THROW __nonnull ((1, 2));
#endif /* Misc || X/Open. */
/* Set N bytes of S to C. */
extern void *memset (void *__s, int __c, size_t __n) __THROW __nonnull ((1));
/* Compare N bytes of S1 and S2. */
extern int memcmp (const void *__s1, const void *__s2, size_t __n)
__THROW __attribute_pure__ __nonnull ((1, 2));
/* Search N bytes of S for C. */
#ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
extern "C++"
{
extern void *memchr (void *__s, int __c, size_t __n)
__THROW __asm ("memchr") __attribute_pure__ __nonnull ((1));
extern const void *memchr (const void *__s, int __c, size_t __n)
__THROW __asm ("memchr") __attribute_pure__ __nonnull ((1));
# ifdef __OPTIMIZE__
__extern_always_inline void *
memchr (void *__s, int __c, size_t __n) __THROW
{
return __builtin_memchr (__s, __c, __n);
}
__extern_always_inline const void *
memchr (const void *__s, int __c, size_t __n) __THROW
{
return __builtin_memchr (__s, __c, __n);
}
# endif
}
#else
extern void *memchr (const void *__s, int __c, size_t __n)
__THROW __attribute_pure__ __nonnull ((1));
#endif
#ifdef __USE_GNU
/* Search in S for C. This is similar to `memchr' but there is no
length limit. */
# ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
extern "C++" void *rawmemchr (void *__s, int __c)
__THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1));
extern "C++" const void *rawmemchr (const void *__s, int __c)
__THROW __asm ("rawmemchr") __attribute_pure__ __nonnull ((1));
# else
extern void *rawmemchr (const void *__s, int __c)
__THROW __attribute_pure__ __nonnull ((1));
# endif
/* Search N bytes of S for the final occurrence of C. */
# ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
extern "C++" void *memrchr (void *__s, int __c, size_t __n)
__THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1));
extern "C++" const void *memrchr (const void *__s, int __c, size_t __n)
__THROW __asm ("memrchr") __attribute_pure__ __nonnull ((1));
# else
extern void *memrchr (const void *__s, int __c, size_t __n)
__THROW __attribute_pure__ __nonnull ((1));
# endif
#endif
/* Copy SRC to DEST. */
extern char *strcpy (char *__restrict __dest, const char *__restrict __src)
__THROW __nonnull ((1, 2));
/* Copy no more than N characters of SRC to DEST. */
extern char *strncpy (char *__restrict __dest,
const char *__restrict __src, size_t __n)
__THROW __nonnull ((1, 2));
/* Append SRC onto DEST. */
extern char *strcat (char *__restrict __dest, const char *__restrict __src)
__THROW __nonnull ((1, 2));
/* Append no more than N characters from SRC onto DEST. */
extern char *strncat (char *__restrict __dest, const char *__restrict __src,
size_t __n) __THROW __nonnull ((1, 2));
/* Compare S1 and S2. */
extern int strcmp (const char *__s1, const char *__s2)
__THROW __attribute_pure__ __nonnull ((1, 2));
/* Compare N characters of S1 and S2. */
extern int strncmp (const char *__s1, const char *__s2, size_t __n)
__THROW __attribute_pure__ __nonnull ((1, 2));
/* Compare the collated forms of S1 and S2. */
extern int strcoll (const char *__s1, const char *__s2)
__THROW __attribute_pure__ __nonnull ((1, 2));
/* Put a transformation of SRC into no more than N bytes of DEST. */
extern size_t strxfrm (char *__restrict __dest,
const char *__restrict __src, size_t __n)
__THROW __nonnull ((2));
#ifdef __USE_XOPEN2K8
/* POSIX.1-2008 extended locale interface (see locale.h). */
# include <bits/types/locale_t.h>
/* Compare the collated forms of S1 and S2, using sorting rules from L. */
extern int strcoll_l (const char *__s1, const char *__s2, locale_t __l)
__THROW __attribute_pure__ __nonnull ((1, 2, 3));
/* Put a transformation of SRC into no more than N bytes of DEST,
using sorting rules from L. */
extern size_t strxfrm_l (char *__dest, const char *__src, size_t __n,
locale_t __l) __THROW __nonnull ((2, 4));
#endif
#if (defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 \
|| __GLIBC_USE (LIB_EXT2))
/* Duplicate S, returning an identical malloc'd string. */
extern char *strdup (const char *__s)
__THROW __attribute_malloc__ __nonnull ((1));
#endif
/* Return a malloc'd copy of at most N bytes of STRING. The
resultant string is terminated even if no null terminator
appears before STRING[N]. */
#if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2)
extern char *strndup (const char *__string, size_t __n)
__THROW __attribute_malloc__ __nonnull ((1));
#endif
#if defined __USE_GNU && defined __GNUC__
/* Duplicate S, returning an identical alloca'd string. */
# define strdupa(s) \
(__extension__ \
({ \
const char *__old = (s); \
size_t __len = strlen (__old) + 1; \
char *__new = (char *) __builtin_alloca (__len); \
(char *) memcpy (__new, __old, __len); \
}))
/* Return an alloca'd copy of at most N bytes of string. */
# define strndupa(s, n) \
(__extension__ \
({ \
const char *__old = (s); \
size_t __len = strnlen (__old, (n)); \
char *__new = (char *) __builtin_alloca (__len + 1); \
__new[__len] = '\0'; \
(char *) memcpy (__new, __old, __len); \
}))
#endif
/* Find the first occurrence of C in S. */
#ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
extern "C++"
{
extern char *strchr (char *__s, int __c)
__THROW __asm ("strchr") __attribute_pure__ __nonnull ((1));
extern const char *strchr (const char *__s, int __c)
__THROW __asm ("strchr") __attribute_pure__ __nonnull ((1));
# ifdef __OPTIMIZE__
__extern_always_inline char *
strchr (char *__s, int __c) __THROW
{
return __builtin_strchr (__s, __c);
}
__extern_always_inline const char *
strchr (const char *__s, int __c) __THROW
{
return __builtin_strchr (__s, __c);
}
# endif
}
#else
extern char *strchr (const char *__s, int __c)
__THROW __attribute_pure__ __nonnull ((1));
#endif
/* Find the last occurrence of C in S. */
#ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
extern "C++"
{
extern char *strrchr (char *__s, int __c)
__THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1));
extern const char *strrchr (const char *__s, int __c)
__THROW __asm ("strrchr") __attribute_pure__ __nonnull ((1));
# ifdef __OPTIMIZE__
__extern_always_inline char *
strrchr (char *__s, int __c) __THROW
{
return __builtin_strrchr (__s, __c);
}
__extern_always_inline const char *
strrchr (const char *__s, int __c) __THROW
{
return __builtin_strrchr (__s, __c);
}
# endif
}
#else
extern char *strrchr (const char *__s, int __c)
__THROW __attribute_pure__ __nonnull ((1));
#endif
#ifdef __USE_GNU
/* This function is similar to `strchr'. But it returns a pointer to
the closing NUL byte in case C is not found in S. */
# ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
extern "C++" char *strchrnul (char *__s, int __c)
__THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1));
extern "C++" const char *strchrnul (const char *__s, int __c)
__THROW __asm ("strchrnul") __attribute_pure__ __nonnull ((1));
# else
extern char *strchrnul (const char *__s, int __c)
__THROW __attribute_pure__ __nonnull ((1));
# endif
#endif
/* Return the length of the initial segment of S which
consists entirely of characters not in REJECT. */
extern size_t strcspn (const char *__s, const char *__reject)
__THROW __attribute_pure__ __nonnull ((1, 2));
/* Return the length of the initial segment of S which
consists entirely of characters in ACCEPT. */
extern size_t strspn (const char *__s, const char *__accept)
__THROW __attribute_pure__ __nonnull ((1, 2));
/* Find the first occurrence in S of any character in ACCEPT. */
#ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
extern "C++"
{
extern char *strpbrk (char *__s, const char *__accept)
__THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2));
extern const char *strpbrk (const char *__s, const char *__accept)
__THROW __asm ("strpbrk") __attribute_pure__ __nonnull ((1, 2));
# ifdef __OPTIMIZE__
__extern_always_inline char *
strpbrk (char *__s, const char *__accept) __THROW
{
return __builtin_strpbrk (__s, __accept);
}
__extern_always_inline const char *
strpbrk (const char *__s, const char *__accept) __THROW
{
return __builtin_strpbrk (__s, __accept);
}
# endif
}
#else
extern char *strpbrk (const char *__s, const char *__accept)
__THROW __attribute_pure__ __nonnull ((1, 2));
#endif
/* Find the first occurrence of NEEDLE in HAYSTACK. */
#ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
extern "C++"
{
extern char *strstr (char *__haystack, const char *__needle)
__THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2));
extern const char *strstr (const char *__haystack, const char *__needle)
__THROW __asm ("strstr") __attribute_pure__ __nonnull ((1, 2));
# ifdef __OPTIMIZE__
__extern_always_inline char *
strstr (char *__haystack, const char *__needle) __THROW
{
return __builtin_strstr (__haystack, __needle);
}
__extern_always_inline const char *
strstr (const char *__haystack, const char *__needle) __THROW
{
return __builtin_strstr (__haystack, __needle);
}
# endif
}
#else
extern char *strstr (const char *__haystack, const char *__needle)
__THROW __attribute_pure__ __nonnull ((1, 2));
#endif
/* Divide S into tokens separated by characters in DELIM. */
extern char *strtok (char *__restrict __s, const char *__restrict __delim)
__THROW __nonnull ((2));
/* Divide S into tokens separated by characters in DELIM. Information
passed between calls are stored in SAVE_PTR. */
extern char *__strtok_r (char *__restrict __s,
const char *__restrict __delim,
char **__restrict __save_ptr)
__THROW __nonnull ((2, 3));
#ifdef __USE_POSIX
extern char *strtok_r (char *__restrict __s, const char *__restrict __delim,
char **__restrict __save_ptr)
__THROW __nonnull ((2, 3));
#endif
#ifdef __USE_GNU
/* Similar to `strstr' but this function ignores the case of both strings. */
# ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
extern "C++" char *strcasestr (char *__haystack, const char *__needle)
__THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
extern "C++" const char *strcasestr (const char *__haystack,
const char *__needle)
__THROW __asm ("strcasestr") __attribute_pure__ __nonnull ((1, 2));
# else
extern char *strcasestr (const char *__haystack, const char *__needle)
__THROW __attribute_pure__ __nonnull ((1, 2));
# endif
#endif
#ifdef __USE_GNU
/* Find the first occurrence of NEEDLE in HAYSTACK.
NEEDLE is NEEDLELEN bytes long;
HAYSTACK is HAYSTACKLEN bytes long. */
extern void *memmem (const void *__haystack, size_t __haystacklen,
const void *__needle, size_t __needlelen)
__THROW __attribute_pure__ __nonnull ((1, 3));
/* Copy N bytes of SRC to DEST, return pointer to bytes after the
last written byte. */
extern void *__mempcpy (void *__restrict __dest,
const void *__restrict __src, size_t __n)
__THROW __nonnull ((1, 2));
extern void *mempcpy (void *__restrict __dest,
const void *__restrict __src, size_t __n)
__THROW __nonnull ((1, 2));
#endif
/* Return the length of S. */
extern size_t strlen (const char *__s)
__THROW __attribute_pure__ __nonnull ((1));
#ifdef __USE_XOPEN2K8
/* Find the length of STRING, but scan at most MAXLEN characters.
If no '\0' terminator is found in that many characters, return MAXLEN. */
extern size_t strnlen (const char *__string, size_t __maxlen)
__THROW __attribute_pure__ __nonnull ((1));
#endif
/* Return a string describing the meaning of the `errno' code in ERRNUM. */
extern char *strerror (int __errnum) __THROW;
#ifdef __USE_XOPEN2K
/* Reentrant version of `strerror'.
There are 2 flavors of `strerror_r', GNU which returns the string
and may or may not use the supplied temporary buffer and POSIX one
which fills the string into the buffer.
To use the POSIX version, -D_XOPEN_SOURCE=600 or -D_POSIX_C_SOURCE=200112L
without -D_GNU_SOURCE is needed, otherwise the GNU version is
preferred. */
# if defined __USE_XOPEN2K && !defined __USE_GNU
/* Fill BUF with a string describing the meaning of the `errno' code in
ERRNUM. */
# ifdef __REDIRECT_NTH
extern int __REDIRECT_NTH (strerror_r,
(int __errnum, char *__buf, size_t __buflen),
__xpg_strerror_r) __nonnull ((2));
# else
extern int __xpg_strerror_r (int __errnum, char *__buf, size_t __buflen)
__THROW __nonnull ((2));
# define strerror_r __xpg_strerror_r
# endif
# else
/* If a temporary buffer is required, at most BUFLEN bytes of BUF will be
used. */
extern char *strerror_r (int __errnum, char *__buf, size_t __buflen)
__THROW __nonnull ((2)) __wur;
# endif
#endif
#ifdef __USE_XOPEN2K8
/* Translate error number to string according to the locale L. */
extern char *strerror_l (int __errnum, locale_t __l) __THROW;
#endif
#ifdef __USE_MISC
# include <strings.h>
/* Set N bytes of S to 0. The compiler will not delete a call to this
function, even if S is dead after the call. */
extern void explicit_bzero (void *__s, size_t __n) __THROW __nonnull ((1));
/* Return the next DELIM-delimited token from *STRINGP,
terminating it with a '\0', and update *STRINGP to point past it. */
extern char *strsep (char **__restrict __stringp,
const char *__restrict __delim)
__THROW __nonnull ((1, 2));
#endif
#ifdef __USE_XOPEN2K8
/* Return a string describing the meaning of the signal number in SIG. */
extern char *strsignal (int __sig) __THROW;
/* Copy SRC to DEST, returning the address of the terminating '\0' in DEST. */
extern char *__stpcpy (char *__restrict __dest, const char *__restrict __src)
__THROW __nonnull ((1, 2));
extern char *stpcpy (char *__restrict __dest, const char *__restrict __src)
__THROW __nonnull ((1, 2));
/* Copy no more than N characters of SRC to DEST, returning the address of
the last character written into DEST. */
extern char *__stpncpy (char *__restrict __dest,
const char *__restrict __src, size_t __n)
__THROW __nonnull ((1, 2));
extern char *stpncpy (char *__restrict __dest,
const char *__restrict __src, size_t __n)
__THROW __nonnull ((1, 2));
#endif
#ifdef __USE_GNU
/* Compare S1 and S2 as strings holding name & indices/version numbers. */
extern int strverscmp (const char *__s1, const char *__s2)
__THROW __attribute_pure__ __nonnull ((1, 2));
/* Sautee STRING briskly. */
extern char *strfry (char *__string) __THROW __nonnull ((1));
/* Frobnicate N bytes of S. */
extern void *memfrob (void *__s, size_t __n) __THROW __nonnull ((1));
# ifndef basename
/* Return the file name within directory of FILENAME. We don't
declare the function if the `basename' macro is available (defined
in <libgen.h>) which makes the XPG version of this function
available. */
# ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
extern "C++" char *basename (char *__filename)
__THROW __asm ("basename") __nonnull ((1));
extern "C++" const char *basename (const char *__filename)
__THROW __asm ("basename") __nonnull ((1));
# else
extern char *basename (const char *__filename) __THROW __nonnull ((1));
# endif
# endif
#endif
#if __GNUC_PREREQ (3,4)
# if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
/* Functions with security checks. */
# include <bits/string_fortified.h>
# endif
#endif
__END_DECLS
#endif /* string.h */