[glibc.git] / string / string.h

/* Copyright (C) 1991,92,93,95,96,97,98,99 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/*
 *	ISO C Standard: 4.11 STRING HANDLING	<string.h>
 */

#ifndef	_STRING_H
#define	_STRING_H	1

#include <features.h>

__BEGIN_DECLS

/* Get size_t and NULL from <stddef.h>.  */
#define	__need_size_t
#define	__need_NULL
#include <stddef.h>


/* Copy N bytes of SRC to DEST.  */
extern __ptr_t memcpy __P ((__ptr_t __restrict __dest,
			    __const __ptr_t __restrict __src, size_t __n));
/* Copy N bytes of SRC to DEST, guaranteeing
   correct behavior for overlapping strings.  */
extern __ptr_t memmove __P ((__ptr_t __dest, __const __ptr_t __src,
			     size_t __n));

/* 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_SVID || defined __USE_BSD || defined __USE_XOPEN
extern __ptr_t memccpy __P ((__ptr_t __dest, __const __ptr_t __src,
			     int __c, size_t __n));
#endif /* SVID.  */


/* Set N bytes of S to C.  */
extern __ptr_t memset __P ((__ptr_t __s, int __c, size_t __n));

/* Compare N bytes of S1 and S2.  */
extern int memcmp __P ((__const __ptr_t __s1, __const __ptr_t __s2,
			size_t __n));

/* Search N bytes of S for C.  */
extern __ptr_t memchr __P ((__const __ptr_t __s, int __c, size_t __n));

#ifdef __USE_GNU
/* Search in S for C.  This is similar to `memchr' but there is no
   length limit.  */
extern __ptr_t rawmemchr __P ((__const __ptr_t __s, int __c));
#endif


/* Copy SRC to DEST.  */
extern char *strcpy __P ((char *__restrict __dest,
			  __const char *__restrict __src));
/* Copy no more than N characters of SRC to DEST.  */
extern char *strncpy __P ((char *__restrict __dest,
			   __const char *__restrict __src, size_t __n));

/* Append SRC onto DEST.  */
extern char *strcat __P ((char *__restrict __dest,
			  __const char *__restrict __src));
/* Append no more than N characters from SRC onto DEST.  */
extern char *strncat __P ((char *__restrict __dest,
			   __const char *__restrict __src, size_t __n));

/* Compare S1 and S2.  */
extern int strcmp __P ((__const char *__s1, __const char *__s2));
/* Compare N characters of S1 and S2.  */
extern int strncmp __P ((__const char *__s1, __const char *__s2, size_t __n));

/* Compare the collated forms of S1 and S2.  */
extern int strcoll __P ((__const char *__s1, __const char *__s2));
/* Put a transformation of SRC into no more than N bytes of DEST.  */
extern size_t strxfrm __P ((char *__restrict __dest,
			    __const char *__restrict __src, size_t __n));

#ifdef __USE_GNU
/* 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>

/* Compare the collated forms of S1 and S2 using rules from L.  */
extern int __strcoll_l __P ((__const char *__s1, __const char *__s2,
			     __locale_t __l));
/* Put a transformation of SRC into no more than N bytes of DEST.  */
extern size_t __strxfrm_l __P ((char *__dest, __const char *__src, size_t __n,
				__locale_t __l));
#endif

#if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
/* Duplicate S, returning an identical malloc'd string.  */
extern char *__strdup __P ((__const char *__s));
extern char *strdup __P ((__const char *__s));
#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_GNU
extern char *strndup __P ((__const char *__string, size_t __n));
#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 = __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 = __builtin_alloca (__len + 1);			      \
      __new[__len] = '\0';						      \
      (char *) memcpy (__new, __old, __len);				      \
    }))
#endif

/* Find the first occurrence of C in S.  */
extern char *strchr __P ((__const char *__s, int __c));
/* Find the last occurrence of C in S.  */
extern char *strrchr __P ((__const char *__s, int __c));

#ifdef __USE_GNU
/* This funciton is similar to `strchr'.  But it returns a pointer to
   the closing NUL byte in case C is not found in S.  */
extern char *strchrnul __P ((__const char *__s, int __c));
#endif

/* Return the length of the initial segment of S which
   consists entirely of characters not in REJECT.  */
extern size_t strcspn __P ((__const char *__s, __const char *__reject));
/* Return the length of the initial segment of S which
   consists entirely of characters in ACCEPT.  */
extern size_t strspn __P ((__const char *__s, __const char *__accept));
/* Find the first occurrence in S of any character in ACCEPT.  */
extern char *strpbrk __P ((__const char *__s, __const char *__accept));
/* Find the first occurrence of NEEDLE in HAYSTACK.  */
extern char *strstr __P ((__const char *__haystack, __const char *__needle));

#ifdef __USE_GNU
/* Similar to `strstr' but this function ignores the case of both strings.  */
extern char *__strcasestr __P ((__const char *__haystack,
				__const char *__needle));
extern char *strcasestr __P ((__const char *__haystack,
			      __const char *__needle));
#endif

/* Divide S into tokens separated by characters in DELIM.  */
extern char *strtok __P ((char *__restrict __s,
			  __const char *__restrict __delim));

/* Divide S into tokens separated by characters in DELIM.  Information
   passed between calls are stored in SAVE_PTR.  */
extern char *__strtok_r __P ((char *__restrict __s,
			      __const char *__restrict __delim,
			      char **__restrict __save_ptr));
#if defined __USE_POSIX || defined __USE_MISC
extern char *strtok_r __P ((char *__restrict __s,
			    __const char *__restrict __delim,
			    char **__restrict __save_ptr));
#endif

#ifdef __USE_GNU
/* Find the first occurrence of NEEDLE in HAYSTACK.
   NEEDLE is NEEDLELEN bytes long;
   HAYSTACK is HAYSTACKLEN bytes long.  */
extern __ptr_t memmem __P ((__const __ptr_t __haystack, size_t __haystacklen,
			    __const __ptr_t __needle, size_t __needlelen));

/* Copy N bytes of SRC to DEST, return pointer to bytes after the
   last written byte.  */
extern __ptr_t __mempcpy __P ((__ptr_t __restrict __dest,
			       __const __ptr_t __restrict __src, size_t __n));
extern __ptr_t mempcpy __P ((__ptr_t __restrict __dest,
			     __const __ptr_t __restrict __src, size_t __n));
#endif


/* Return the length of S.  */
extern size_t strlen __P ((__const char *__s));

#ifdef	__USE_GNU
/* 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 __P ((__const char *__string, size_t __maxlen));
#endif


/* Return a string describing the meaning of the `errno' code in ERRNUM.  */
extern char *strerror __P ((int __errnum));
#ifdef	__USE_MISC
/* Reentrant version of `strerror'.  If a temporary buffer is required, at
   most BUFLEN bytes of BUF will be used.  */
extern char *__strerror_r __P ((int __errnum, char *__buf, size_t __buflen));
extern char *strerror_r __P ((int __errnum, char *__buf, size_t __buflen));
#endif

/* We define this function always since `bzero' is sometimes needed when
   the namespace rules does not allow this.  */
extern void __bzero __P ((__ptr_t __s, size_t __n));

#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
/* Copy N bytes of SRC to DEST (like memmove, but args reversed).  */
extern void bcopy __P ((__const __ptr_t __src, __ptr_t __dest, size_t __n));

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

/* Compare N bytes of S1 and S2 (same as memcmp).  */
extern int bcmp __P ((__const __ptr_t __s1, __const __ptr_t __s2, size_t __n));

/* Find the first occurrence of C in S (same as strchr).  */
extern char *index __P ((__const char *__s, int __c));

/* Find the last occurrence of C in S (same as strrchr).  */
extern char *rindex __P ((__const char *__s, int __c));

/* 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 __P ((int __i)) __attribute__ ((const));
extern int ffs __P ((int __i)) __attribute__ ((const));

/* The following two functions are non-standard but necessary for non-32 bit
   platforms.  */
# ifdef	__USE_GNU
extern int ffsl __P ((long int __l)) __attribute__ ((const));
#  ifdef __GNUC__
__extension__ extern int ffsll __P ((long long int __ll))
     __attribute__ ((const));
#  endif
# endif

/* Compare S1 and S2, ignoring case.  */
extern int __strcasecmp __P ((__const char *__s1, __const char *__s2));
extern int strcasecmp __P ((__const char *__s1, __const char *__s2));

/* Compare no more than N chars of S1 and S2, ignoring case.  */
extern int strncasecmp __P ((__const char *__s1, __const char *__s2,
			     size_t __n));
#endif /* Use BSD or X/Open Unix.  */

#ifdef	__USE_GNU
/* Again versions of a few functions which use the given locale instead
   of the global one.  */
extern int __strcasecmp_l __P ((__const char *__s1, __const char *__s2,
				__locale_t __loc));

extern int __strncasecmp_l __P ((__const char *__s1, __const char *__s2,
				 size_t __n, __locale_t __loc));
#endif

#ifdef	__USE_BSD
/* Return the next DELIM-delimited token from *STRINGP,
   terminating it with a '\0', and update *STRINGP to point past it.  */
extern char *strsep __P ((char **__restrict __stringp,
			  __const char *__restrict __delim));
#endif

#ifdef	__USE_GNU
/* Compare S1 and S2 as strings holding name & indices/version numbers.  */
extern int strverscmp __P ((__const char *__s1, __const char *__s2));

/* Return a string describing the meaning of the signal number in SIG.  */
extern char *strsignal __P ((int __sig));

/* Copy SRC to DEST, returning the address of the terminating '\0' in DEST.  */
extern char *__stpcpy __P ((char *__restrict __dest,
			    __const char *__restrict __src));
extern char *stpcpy __P ((char *__restrict __dest,
			  __const char *__restrict __src));

/* Copy no more than N characters of SRC to DEST, returning the address of
   the last character written into DEST.  */
extern char *__stpncpy __P ((char *__restrict __dest,
			     __const char *__restrict __src, size_t __n));
extern char *stpncpy __P ((char *__restrict __dest,
			   __const char *__restrict __src, size_t __n));

/* Sautee STRING briskly.  */
extern char *strfry __P ((char *__string));

/* Frobnicate N bytes of S.  */
extern __ptr_t memfrob __P ((__ptr_t __s, size_t __n));

# 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.  */
extern char *basename __P ((__const char *__filename));
# endif
#endif


#if defined __GNUC__ && __GNUC__ >= 2
# if defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ && !defined __cplusplus
/* When using GNU CC we provide some optimized versions of selected
   functions from this header.  There are two kinds of optimizations:

   - machine-dependent optimizations, most probably using inline
     assembler code; these might be quite expensive since the code
     size can increase significantly.
     These optimizations are not used unless the symbol
	__USE_STRING_INLINES
     is defined before including this header.

   - machine-independent optimizations which do not increase the
     code size significantly and which optimize mainly situations
     where one or more arguments are compile-time constants.
     These optimizations are used always when the compiler is
     taught to optimize.

   One can inhibit all optimizations by defining __NO_STRING_INLINES.  */

/* Get the machine-dependent optimizations (if any).  */
#  include <bits/string.h>

/* These are generic optimizations which do not add too much inline code.  */
#  include <bits/string2.h>
# endif
#endif

__END_DECLS

#endif /* string.h  */
Commit	Line	Data
482eec0d	1	/* Copyright (C) 1991,92,93,95,96,97,98,99 Free Software Foundation, Inc.
ba1ffaa1	2	This file is part of the GNU C Library.
28f540f4	3
ba1ffaa1 UD	4	The GNU C Library is free software; you can redistribute it and/or
	5	modify it under the terms of the GNU Library General Public License as
	6	published by the Free Software Foundation; either version 2 of the
	7	License, or (at your option) any later version.
28f540f4	8
ba1ffaa1 UD	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	Library General Public License for more details.
28f540f4	13
ba1ffaa1 UD	14	You should have received a copy of the GNU Library General Public
	15	License along with the GNU C Library; see the file COPYING.LIB. If not,
	16	write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	17	Boston, MA 02111-1307, USA. */
28f540f4 RM	18
28f540f4 RM	19	/*
ba1ffaa1	20	* ISO C Standard: 4.11 STRING HANDLING <string.h>
28f540f4 RM	21	*/
	22
	23	#ifndef _STRING_H
28f540f4	24	#define _STRING_H 1
5107cf1d	25
28f540f4 RM	26	#include <features.h>
	27
	28	__BEGIN_DECLS
	29
	30	/* Get size_t and NULL from <stddef.h>. */
	31	#define __need_size_t
	32	#define __need_NULL
	33	#include <stddef.h>
	34
	35
	36	/* Copy N bytes of SRC to DEST. */
2f6d1f1b UD	37	extern __ptr_t memcpy __P ((__ptr_t __restrict __dest,
2f6d1f1b UD	38	__const __ptr_t __restrict __src, size_t __n));
28f540f4 RM	39	/* Copy N bytes of SRC to DEST, guaranteeing
	40	correct behavior for overlapping strings. */
	41	extern __ptr_t memmove __P ((__ptr_t __dest, __const __ptr_t __src,
	42	size_t __n));
	43
	44	/* Copy no more than N bytes of SRC to DEST, stopping when C is found.
	45	Return the position in DEST one byte past where C was copied,
	46	or NULL if C was not found in the first N bytes of SRC. */
377a515b	47	#if defined __USE_SVID \|\| defined __USE_BSD \|\| defined __USE_XOPEN
28f540f4 RM	48	extern __ptr_t memccpy __P ((__ptr_t __dest, __const __ptr_t __src,
28f540f4 RM	49	int __c, size_t __n));
28f540f4 RM	50	#endif /* SVID. */
	51
	52
	53	/* Set N bytes of S to C. */
	54	extern __ptr_t memset __P ((__ptr_t __s, int __c, size_t __n));
	55
	56	/* Compare N bytes of S1 and S2. */
	57	extern int memcmp __P ((__const __ptr_t __s1, __const __ptr_t __s2,
	58	size_t __n));
	59
	60	/* Search N bytes of S for C. */
	61	extern __ptr_t memchr __P ((__const __ptr_t __s, int __c, size_t __n));
	62
482eec0d UD	63	#ifdef __USE_GNU
	64	/* Search in S for C. This is similar to `memchr' but there is no
	65	length limit. */
	66	extern __ptr_t rawmemchr __P ((__const __ptr_t __s, int __c));
	67	#endif
	68
28f540f4 RM	69
28f540f4 RM	70	/* Copy SRC to DEST. */
2f6d1f1b UD	71	extern char strcpy __P ((char __restrict __dest,
2f6d1f1b UD	72	__const char *__restrict __src));
28f540f4	73	/* Copy no more than N characters of SRC to DEST. */
2f6d1f1b UD	74	extern char strncpy __P ((char __restrict __dest,
2f6d1f1b UD	75	__const char *__restrict __src, size_t __n));
28f540f4 RM	76
28f540f4 RM	77	/* Append SRC onto DEST. */
2f6d1f1b UD	78	extern char strcat __P ((char __restrict __dest,
2f6d1f1b UD	79	__const char *__restrict __src));
28f540f4	80	/* Append no more than N characters from SRC onto DEST. */
2f6d1f1b UD	81	extern char strncat __P ((char __restrict __dest,
2f6d1f1b UD	82	__const char *__restrict __src, size_t __n));
28f540f4 RM	83
	84	/* Compare S1 and S2. */
	85	extern int strcmp __P ((__const char __s1, __const char __s2));
	86	/* Compare N characters of S1 and S2. */
	87	extern int strncmp __P ((__const char __s1, __const char __s2, size_t __n));
	88
	89	/* Compare the collated forms of S1 and S2. */
	90	extern int strcoll __P ((__const char __s1, __const char __s2));
	91	/* Put a transformation of SRC into no more than N bytes of DEST. */
2f6d1f1b UD	92	extern size_t strxfrm __P ((char *__restrict __dest,
2f6d1f1b UD	93	__const char *__restrict __src, size_t __n));
28f540f4	94
c84142e8 UD	95	#ifdef __USE_GNU
	96	/* The following functions are equivalent to the both above but they
	97	take the locale they use for the collation as an extra argument.
	98	This is not standardsized but something like will come. */
	99	# include <xlocale.h>
	100
	101	/* Compare the collated forms of S1 and S2 using rules from L. */
	102	extern int __strcoll_l __P ((__const char __s1, __const char __s2,
	103	__locale_t __l));
	104	/* Put a transformation of SRC into no more than N bytes of DEST. */
	105	extern size_t __strxfrm_l __P ((char __dest, __const char __src, size_t __n,
	106	__locale_t __l));
	107	#endif
	108
377a515b	109	#if defined __USE_SVID \|\| defined __USE_BSD \|\| defined __USE_XOPEN_EXTENDED
28f540f4	110	/* Duplicate S, returning an identical malloc'd string. */
6dbe2837	111	extern char __strdup __P ((__const char __s));
28f540f4 RM	112	extern char strdup __P ((__const char __s));
	113	#endif
	114
6dbe2837 RM	115	/* Return a malloc'd copy of at most N bytes of STRING. The
	116	resultant string is terminated even if no null terminator
	117	appears before STRING[N]. */
377a515b	118	#if defined __USE_GNU
6dbe2837	119	extern char strndup __P ((__const char __string, size_t __n));
6d52618b	120	#endif
6dbe2837	121
377a515b	122	#if defined __USE_GNU && defined __GNUC__
036cc82f	123	/* Duplicate S, returning an identical alloca'd string. */
3996f34b	124	# define strdupa(s) \
036cc82f RM	125	(__extension__ \
	126	({ \
	127	__const char *__old = (s); \
	128	size_t __len = strlen (__old) + 1; \
	129	char *__new = __builtin_alloca (__len); \
3996f34b	130	(char *) memcpy (__new, __old, __len); \
036cc82f RM	131	}))
036cc82f RM	132
6dbe2837	133	/* Return an alloca'd copy of at most N bytes of string. */
3996f34b	134	# define strndupa(s, n) \
036cc82f RM	135	(__extension__ \
	136	({ \
	137	__const char *__old = (s); \
	138	size_t __len = strnlen (__old, (n)); \
	139	char *__new = __builtin_alloca (__len + 1); \
	140	__new[__len] = '\0'; \
3996f34b	141	(char *) memcpy (__new, __old, __len); \
036cc82f	142	}))
02ac66c5 RM	143	#endif
02ac66c5 RM	144
28f540f4 RM	145	/* Find the first occurrence of C in S. */
	146	extern char strchr __P ((__const char __s, int __c));
	147	/* Find the last occurrence of C in S. */
	148	extern char strrchr __P ((__const char __s, int __c));
	149
c4563d2d UD	150	#ifdef __USE_GNU
	151	/* This funciton is similar to `strchr'. But it returns a pointer to
	152	the closing NUL byte in case C is not found in S. */
	153	extern char strchrnul __P ((__const char __s, int __c));
	154	#endif
	155
28f540f4 RM	156	/* Return the length of the initial segment of S which
	157	consists entirely of characters not in REJECT. */
	158	extern size_t strcspn __P ((__const char __s, __const char __reject));
	159	/* Return the length of the initial segment of S which
	160	consists entirely of characters in ACCEPT. */
	161	extern size_t strspn __P ((__const char __s, __const char __accept));
6d52618b	162	/* Find the first occurrence in S of any character in ACCEPT. */
28f540f4	163	extern char strpbrk __P ((__const char __s, __const char *__accept));
6d52618b	164	/* Find the first occurrence of NEEDLE in HAYSTACK. */
28f540f4	165	extern char strstr __P ((__const char __haystack, __const char *__needle));
f4017d20 UD	166
	167	#ifdef __USE_GNU
	168	/* Similar to `strstr' but this function ignores the case of both strings. */
	169	extern char __strcasestr __P ((__const char __haystack,
	170	__const char *__needle));
	171	extern char strcasestr __P ((__const char __haystack,
	172	__const char *__needle));
	173	#endif
	174
28f540f4	175	/* Divide S into tokens separated by characters in DELIM. */
2f6d1f1b UD	176	extern char strtok __P ((char __restrict __s,
2f6d1f1b UD	177	__const char *__restrict __delim));
28f540f4	178
59dd8641 RM	179	/* Divide S into tokens separated by characters in DELIM. Information
59dd8641 RM	180	passed between calls are stored in SAVE_PTR. */
a6ff34d7 UD	181	extern char __strtok_r __P ((char __restrict __s,
	182	__const char *__restrict __delim,
	183	char **__restrict __save_ptr));
89a9e37b	184	#if defined __USE_POSIX \|\| defined __USE_MISC
a6ff34d7 UD	185	extern char strtok_r __P ((char __restrict __s,
	186	__const char *__restrict __delim,
	187	char **__restrict __save_ptr));
9d187dd4	188	#endif
59dd8641	189
9d187dd4	190	#ifdef __USE_GNU
6d52618b	191	/* Find the first occurrence of NEEDLE in HAYSTACK.
28f540f4 RM	192	NEEDLE is NEEDLELEN bytes long;
	193	HAYSTACK is HAYSTACKLEN bytes long. */
	194	extern __ptr_t memmem __P ((__const __ptr_t __haystack, size_t __haystacklen,
	195	__const __ptr_t __needle, size_t __needlelen));
9a0a462c UD	196
	197	/* Copy N bytes of SRC to DEST, return pointer to bytes after the
	198	last written byte. */
	199	extern __ptr_t __mempcpy __P ((__ptr_t __restrict __dest,
	200	__const __ptr_t __restrict __src, size_t __n));
	201	extern __ptr_t mempcpy __P ((__ptr_t __restrict __dest,
	202	__const __ptr_t __restrict __src, size_t __n));
28f540f4 RM	203	#endif
28f540f4 RM	204
8d71c7b0	205
28f540f4 RM	206	/* Return the length of S. */
	207	extern size_t strlen __P ((__const char *__s));
	208
8d71c7b0 RM	209	#ifdef __USE_GNU
	210	/* Find the length of STRING, but scan at most MAXLEN characters.
	211	If no '\0' terminator is found in that many characters, return MAXLEN. */
	212	extern size_t strnlen __P ((__const char *__string, size_t __maxlen));
8d71c7b0 RM	213	#endif
	214
	215
60478656	216	/* Return a string describing the meaning of the `errno' code in ERRNUM. */
28f540f4	217	extern char *strerror __P ((int __errnum));
19361cb7	218	#ifdef __USE_MISC
60478656 RM	219	/* Reentrant version of `strerror'. If a temporary buffer is required, at
60478656 RM	220	most BUFLEN bytes of BUF will be used. */
47707456	221	extern char __strerror_r __P ((int __errnum, char __buf, size_t __buflen));
9f447fb3	222	extern char strerror_r __P ((int __errnum, char __buf, size_t __buflen));
60478656	223	#endif
28f540f4	224
61eb22d3 UD	225	/* We define this function always since `bzero' is sometimes needed when
	226	the namespace rules does not allow this. */
	227	extern void __bzero __P ((__ptr_t __s, size_t __n));
	228
4b8f94d3	229	#if defined __USE_BSD \|\| defined __USE_XOPEN_EXTENDED
28f540f4 RM	230	/* Copy N bytes of SRC to DEST (like memmove, but args reversed). */
	231	extern void bcopy __P ((__const __ptr_t __src, __ptr_t __dest, size_t __n));
	232
	233	/* Set N bytes of S to 0. */
	234	extern void bzero __P ((__ptr_t __s, size_t __n));
	235
	236	/* Compare N bytes of S1 and S2 (same as memcmp). */
	237	extern int bcmp __P ((__const __ptr_t __s1, __const __ptr_t __s2, size_t __n));
	238
2c6fe0bd UD	239	/* Find the first occurrence of C in S (same as strchr). */
	240	extern char index __P ((__const char __s, int __c));
	241
	242	/* Find the last occurrence of C in S (same as strrchr). */
	243	extern char rindex __P ((__const char __s, int __c));
	244
28f540f4 RM	245	/* Return the position of the first bit set in I, or 0 if none are set.
28f540f4 RM	246	The least-significant bit is position 1, the most-significant 32. */
bdd421cc UD	247	extern int __ffs __P ((int __i)) __attribute__ ((const));
	248	extern int ffs __P ((int __i)) __attribute__ ((const));
	249
	250	/* The following two functions are non-standard but necessary for non-32 bit
	251	platforms. */
	252	# ifdef __USE_GNU
	253	extern int ffsl __P ((long int __l)) __attribute__ ((const));
	254	# ifdef __GNUC__
7782d0bf UD	255	__extension__ extern int ffsll __P ((long long int __ll))
7782d0bf UD	256	__attribute__ ((const));
bdd421cc UD	257	# endif
bdd421cc UD	258	# endif
28f540f4 RM	259
28f540f4 RM	260	/* Compare S1 and S2, ignoring case. */
3ec41e03	261	extern int __strcasecmp __P ((__const char __s1, __const char __s2));
28f540f4 RM	262	extern int strcasecmp __P ((__const char __s1, __const char __s2));
28f540f4 RM	263
6e86a7c2 RM	264	/* Compare no more than N chars of S1 and S2, ignoring case. */
	265	extern int strncasecmp __P ((__const char __s1, __const char __s2,
	266	size_t __n));
2c6fe0bd	267	#endif /* Use BSD or X/Open Unix. */
6e86a7c2	268
0501d603 UD	269	#ifdef __USE_GNU
	270	/* Again versions of a few functions which use the given locale instead
	271	of the global one. */
	272	extern int __strcasecmp_l __P ((__const char __s1, __const char __s2,
	273	__locale_t __loc));
	274
	275	extern int __strncasecmp_l __P ((__const char __s1, __const char __s2,
	276	size_t __n, __locale_t __loc));
	277	#endif
	278
2c6fe0bd	279	#ifdef __USE_BSD
28f540f4 RM	280	/* Return the next DELIM-delimited token from *STRINGP,
28f540f4 RM	281	terminating it with a '\0', and update STRINGP to point past it. /
a6ff34d7 UD	282	extern char strsep __P ((char *__restrict __stringp,
a6ff34d7 UD	283	__const char *__restrict __delim));
28f540f4 RM	284	#endif
28f540f4 RM	285
28f540f4	286	#ifdef __USE_GNU
1f205a47 UD	287	/* Compare S1 and S2 as strings holding name & indices/version numbers. */
	288	extern int strverscmp __P ((__const char __s1, __const char __s2));
	289
28f540f4 RM	290	/* Return a string describing the meaning of the signal number in SIG. */
	291	extern char *strsignal __P ((int __sig));
	292
	293	/* Copy SRC to DEST, returning the address of the terminating '\0' in DEST. */
a6ff34d7 UD	294	extern char __stpcpy __P ((char __restrict __dest,
	295	__const char *__restrict __src));
	296	extern char stpcpy __P ((char __restrict __dest,
	297	__const char *__restrict __src));
28f540f4 RM	298
	299	/* Copy no more than N characters of SRC to DEST, returning the address of
	300	the last character written into DEST. */
a6ff34d7 UD	301	extern char __stpncpy __P ((char __restrict __dest,
	302	__const char *__restrict __src, size_t __n));
	303	extern char stpncpy __P ((char __restrict __dest,
	304	__const char *__restrict __src, size_t __n));
28f540f4	305
28f540f4 RM	306	/* Sautee STRING briskly. */
	307	extern char strfry __P ((char __string));
	308
	309	/* Frobnicate N bytes of S. */
	310	extern __ptr_t memfrob __P ((__ptr_t __s, size_t __n));
28f540f4	311
92f1da4d	312	# ifndef basename
dd33e89f UD	313	/* Return the file name within directory of FILENAME. We don't
	314	declare the function if the `basename' macro is available (defined
	315	in <libgen.h>) which makes the XPG version of this function
	316	available. */
036cc82f	317	extern char basename __P ((__const char __filename));
92f1da4d	318	# endif
84724245 RM	319	#endif
84724245 RM	320
55c14926	321
847a35a0	322	#if defined __GNUC__ && __GNUC__ >= 2
cc60175e	323	# if defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ && !defined __cplusplus
9a0a462c UD	324	/* When using GNU CC we provide some optimized versions of selected
	325	functions from this header. There are two kinds of optimizations:
	326
61952351 UD	327	- machine-dependent optimizations, most probably using inline
	328	assembler code; these might be quite expensive since the code
	329	size can increase significantly.
9a0a462c UD	330	These optimizations are not used unless the symbol
9a0a462c UD	331	__USE_STRING_INLINES
61952351	332	is defined before including this header.
9a0a462c UD	333
	334	- machine-independent optimizations which do not increase the
	335	code size significantly and which optimize mainly situations
	336	where one or more arguments are compile-time constants.
	337	These optimizations are used always when the compiler is
61952351	338	taught to optimize.
9a0a462c	339
61eb22d3 UD	340	One can inhibit all optimizations by defining __NO_STRING_INLINES. */
	341
	342	/* Get the machine-dependent optimizations (if any). */
847a35a0	343	# include <bits/string.h>
9a0a462c UD	344
9a0a462c UD	345	/* These are generic optimizations which do not add too much inline code. */
847a35a0 UD	346	# include <bits/string2.h>
847a35a0 UD	347	# endif
92f1da4d UD	348	#endif
92f1da4d UD	349
28f540f4 RM	350	__END_DECLS
	351
	352	#endif /* string.h */