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glibc/stdlib/stdlib.h
Ulrich Drepper f0e4495937 update from main archive 961101 
Sat Nov  2 01:48:47 1996  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/errnos.h: Move declaration of errno
	and __errno_location to correct position.

Thu Oct 31 22:51:25 1996  Ulrich Drepper  <drepper@cygnus.com>

	* Makefile (distribute): Add rellns-sh.
	* rellns-sh: New file.
	* Makerules (make-link): Use rellns-sh.
	* time/Makefile ($(installed-localtime-file)): Likewise.

Thu Oct 31 11:33:01 1996  Ulrich Drepper  <drepper@cygnus.com>

	* elf/Makefile ($objpfx)ldd) Substitute $(version) for @VERSION@.
	(distribute): Add ldd.bash.in.
	* elf/ldd.sh.in: Process --help and --version parameter.
	Correct comments.
	* elf/ldd.bash.in: New file.

	* stdlib/stdlib.h: Add prototype for clearenv.
	* sysdeps/generic/setenv.c: Add implementation of clearenv.
	(setenv): Handle __environ == NULL correctly.
	* sysdeps/stub/setenv.c: Add stub definition for unsetenv and
	clearenv.

	* sysdeps/generic/putenv.c: Correct layout to fit in libit.
	* sysdeps/generic/setenv.c: Likewise.
	* stdlib/strtol.h: Likewise.

	* time/sys/time.h: Define __need_timeval and include <timebits.h>.
	Remove definition of struct timeval.
	* sysdeps/stub/timebits.h [__need_timeval]: Define struct timeval
	using `time_t' for members.
	* sysdeps/unix/sysv/linux/timebits.h [__need_timeval]: Likewise.
	* sysdeps/unix/sysv/linux/alpha/timebits.h: New file.  Same
	as old Linux specific version.

	* string/argz.h: Use __const in definitions.
	* inet/herrno.c: Don't define __h_errno, only h_errno otherwise the
	__syscall_error defined.
	TRACE_MODE.
	Craig Metz.
	arithmetic.
	buggy and more competent people work on a usable version which is
	distributed separately.
	`finitel'.
	better message if it is not available.
	whether read failed.
	PSEUDO_END macro.
	Especially on the currently supported ELF systems the nlist
	function comes with the libelf.
	"$(i18ndir)/charmaps".
	net/if_arp.h, and net/route.h.
	version.
	EXTERN_PARSER is defined.
	set errno (to ENOMEM).
	nothing is found.  This guarantees all subsequent calls behave
	the same.
	the file even if no `era's are specified.
	pointers.
	_llseek to _llseek (not llseek).
	Initialize `result'.
	end_alt_digits.
	__libc_force_cancel_wrapper when compiling reentrant version.
	a weak alias.
	make tcdrain a weak alias.
	lseek, open, read, and write to have __libc_ prefix and make old
	names a weak alias.
	to fpathconf.
	__libc_setlocale_lock.
	ld.so.preload.  Suggested by David Engel <david@elo.ods.com>.
	on the same device as the password file.
	variable.
	to lock when passing it to __libc_lock_init macro.
	sysdep.h to the top outside of #ifndef PIC.  Don't include errnos.h.
	Use the ENTRY macro.
	9th field.
	and sys/vt.h.
	`_dl_start' so that linking fails if this file should ever be used
	in ld.so.
	RMS' last standard revision.
	(sysdep_headers): Remove sys/sysinfo.h.
	match files in the sysdeps hierachy (welcome back,
	sys/syscall.h!).
	categories which succeeded to load after a wrong or missing data
	file was observed.
	_IO_flockfile and _IO_funlockfile resp.
	all three versions of the math function.
	non-trivial inline functions.
	rpath-link so that running the check finds the new library.
	daylight saving, timezone by time zone.
	syscall_error handler for reentrant libc.
	warning.
	_IO_getc_unlocked.
	in version information banner.
	clearerr_u, feof_u, ferror_u, fputc_u, getc_u, getchar_u,
	iofflush_u, putc_u, putchar_u, ioflockfile.
	using __errno_location function.
	syscall_error handler for reentrant libc.
	definition of function itself.
	funlockfile.
	_malloc_loc.
	but _POSIX_THREAD_DESTRUCTOR_ITERATIONS.
	Add macro `errno' to get thread specific variable.
	__errno_location function.
	* malloc/free.c (free): __lib_malloc_lock -> __libc_malloc_lock.
	case, so don't prepend uppercase `ISO' for only numeric arg.
	call to __libc_lock_lock.
	sys/sysmacros.h.  Reported by Curtiss <1CMC3466@IBM.MTSAC.EDU>.
	stamp file.
	generating stamp file.
	implementation.
	`decimal' char is 0.
	noexpr to "^[nN]"; this conforms to POSIX.2.
	conform to POSIX.2.
	mon_grouping, int_frac_digits, frac_digits, p_cs_precedes,
	p_sep_by_space, n_cs_precedes, n_sep_by_space, p_sign_posn, and
	n_sign_posn to CHAR_MAX, as required by the POSIX Standard.
	variable.
	this changes the global state for `localtime' and `gmtime'.  Use
	`__localtime_r'/`__gmtime_r' instead.
	state.
	getutid_r() fails with ESRCH.  Reported by Miquel van Smoorenburg.
	for "Jensen" so _bus_base() returns 0 on that platform.  Use
	_bus_base_sparse() to determine base address of sparse memory.
	are now in $P/stdio-common.pot.
	script at run time, not configure time.
	warning.
	sorted.
	inet_net_pton, inet_net.
	value of sprintf.
	functions instead of BSD `b*' functions.
	$(objpfx)/mach-syscalls.mk.
	<marcus@sysc.pdx.edu> for the patch.)
	before returning.  Reported by Miles Bader.
	__BEGIN_DECLS/__END_DECLS up so ntohl() et al are bracketed as
	well.
	This is not a gross hack, after all---for compatibility,
	getlogin() really should check fd 0 only and not try to base its
	operation on the controlling tty.
	change utmp_data from static to auto.
	_IO_file_flags.  It's the same as _flags.
	call is only a stub.
	Mikasa.
	pointer as __const.
	segfault when called with an N that is not a multiple of four and
	src[N-1]=='\0'.
	try again with SOCK_STREAM (the Linux syslogd uses a socket of the
	latter type).
	terminator as a record-delimiter.  If __send(LogFile) fails,
	`getutline_r'.
	`setutline_r'.
	of `vscanf'.
	name a weak alias.
	typo.
	initialized in init-first.c.  Some actions in the libc work
	different when libc is static or dynamic.
	`__libc_is_static' variable to determine whether call to
	`personality' and `setfpucw' is necessary.  When done set variable
	to +-1 depending on library type.
	`__libc_enable_secure' instead of calling `get{,e}{g,u}id()' to
	determine whether it's a SET[UG]ID program.
	(open_file): New function, contents mostly from __open.
	LD_TRACE_LOADED_OBJECTS is set.
	n)' equivalent to `strncpy (d, s, n), d += strnlen (d, n)'.
	from the USA any software that even makes it easy to drop in an
	encryption module of foreign origin.
	old code would have failed on a big-endian 64-bit architecture).
	Remove gratitous parentheses around return expressions.
	not int.
	ustatbits.h.
	alphabetically correct place.  Mention ustat.
	record always gets appended at end of file (wtmp is a log file,
	after all).  Set ut_type to DEAD_PROCESS if name is empty.
	ut_line matches and type is either USER_PROCESS or LOGIN_PROCESS.
	avoid duplicate declarations.
	word extends right up to rmargin.
	point_col ssize_t.
	to fiddle __put_limit in conjunction with __linebuf_active.
	of, not the ones he is _not_ a member of.
	instead of a local function.  The latter are difficult to debug
	and slow to execute on certain platforms.
	place of sizeof (dev).  The size of a literal string includes the
	NUL byte.
	entry.  Return 1 on error, not -1.
	shift amount for Jensen must be 5 not 4.
	for send and connect syscalls.
	signed<->unsigned warnings.
	variable name, so new a libc with new requirements won't fail to
	notice an insufficient Linux version.
	PENDIN, NOFLSH): Undefine these at start if they are already
	defined to avoid collision with termbits.h.
	error is 0.  The "placeholder" entries recently added to
	memcpy for possibly overlapping strings.
	instead of weak_symbol (NAME) after the defn.
	necessary using current implementation of memcpy, but...).
	Move struct timespec defn outside [_TIME_H] so it can be got with
	#define __need_timespec.
	__connect instead of connect to avoid name-space collisions (e.g.,
	with psgetty).
	function ctype_is_charmap to ctype_is_charconv.
	charconv.
	charconv.
	lables according to this.
	warnings.
	actually do something.
	sysdeps/unix/sysv/linux/m68k/init-first.h,
	sysdeps/unix/sysv/linux/i386/init-first.h: New files.
	init-first.h to make abstract machine dependent parts of
	typo/extraneous whitespace.
	check-for-pending signals code, release _hurd_siglock before
	jumping to deliver_pending.
	size_t.
	soname of a loaded object, use that object.
	if libnss_dns.so module for DNS name lookup in NSS service.
	guessing to not assume p_vaddr of first load cmd is zero.
	only for ?s, not for *s.  Fix from Chet Ramey.
	about currently used character set.
	name `MAX_IOVEC'.  Instead use standard name `UIO_MAXIOV'.
	(xdrrec_getlong), sunrpc/xdr_mem.c (xdrmem_getlong): Make sure
	appropriate sign-extension is performed on machines with
	sizeof(long) > 4.
	sizeof(int)<sizeof(long), we need to go through a temporary
	variable.
	in efect.
	volatile to avoid "might get clobbered by longjmp" warning.
	unless _LOOSE_KERNEL_NAMES is in effect (which, with high
	probability is a sure loser).
	sysdeps/unix/sysv/linux/alpha/brk.S,
	sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S,
	sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S,
	sysdeps/unix/sysv/linux/alpha/llseek.S,
	sysdeps/unix/sysv/linux/alpha/sigsuspend.S,
	sysdeps/unix/sysv/linux/alpha/syscall.S: Rename syscall_error to
	__syscall_error to avoid intruding application name space.
	sysdeps/unix/geteuid.S, sysdeps/unix/getppid.S,
	sysdeps/unix/execve.S, sysdeps/unix/fork.S,
	sysdeps/unix/syscall.S: Terminate syscall with PSEUDO_END.
	(PSEUDO_END): Rename END() to PSEUDO_END().
	to PSEUDO_END to improve branch-prediction.  Include .frame
	directive to make syscalls debugabble.
	sysdeps/unix/sysv/linux/alpha/brk.S: Use ldiq instead of ldi since
	latter is illegal under DEC Unix.
	as well.
	EWOULDBLOCK -> EAGAIN mapping was unnecessary since
	EWOULDBLOCK==EAGAIN under DEC Unix and Linux/Alpha).
	address register in the .frame directive.
	avoid RPC definitions of INADDR_LOOPBACK and/or MAXHOSTNAMELEN.
	compilable under c++.
	as unsigned long, not as int (to avoid incorrect int->long
	promotion).
1996-11-02 01:28:01 +00:00

543 lines
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/* Copyright (C) 1991, 92, 93, 94, 95, 96 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 S Standard: 4.10 GENERAL UTILITIES <stdlib.h>
*/
#ifndef _STDLIB_H
#define _STDLIB_H 1
#include <features.h>
/* Get size_t, wchar_t and NULL from <stddef.h>. */
#define __need_size_t
#define __need_wchar_t
#define __need_NULL
#include <stddef.h>
#define __need_Emath
#include <errno.h>
__BEGIN_DECLS
/* Returned by `div'. */
typedef struct
{
int quot; /* Quotient. */
int rem; /* Remainder. */
} div_t;
/* Returned by `ldiv'. */
typedef struct
{
long int quot; /* Quotient. */
long int rem; /* Remainder. */
} ldiv_t;
#ifdef __USE_GNU
/* Returned by `lldiv'. */
typedef struct
{
long long int quot; /* Quotient. */
long long int rem; /* Remainder. */
} lldiv_t;
#endif
/* The largest number rand will return (same as INT_MAX). */
#define RAND_MAX 2147483647
/* We define these the same for all machines.
Changes from this to the outside world should be done in `_exit'. */
#define EXIT_FAILURE 1 /* Failing exit status. */
#define EXIT_SUCCESS 0 /* Successful exit status. */
/* Maximum length of a multibyte character in the current locale. */
#define MB_CUR_MAX (__ctype_get_mb_cur_max ())
extern int __ctype_get_mb_cur_max __P ((void));
/* Convert a string to a floating-point number. */
extern double atof __P ((__const char *__nptr));
/* Convert a string to an integer. */
extern int atoi __P ((__const char *__nptr));
/* Convert a string to a long integer. */
extern long int atol __P ((__const char *__nptr));
/* Convert a string to a floating-point number. */
extern double strtod __P ((__const char *__nptr, char **__endptr));
#ifdef __USE_GNU
/* Likewise for `float' and `long double' sizes of floating-point numbers. */
extern float strtof __P ((__const char *__nptr, char **__endptr));
extern __long_double_t strtold __P ((__const char *__nptr, char **__endptr));
#endif
/* Convert a string to a long integer. */
extern long int strtol __P ((__const char *__nptr, char **__endptr,
int __base));
/* Convert a string to an unsigned long integer. */
extern unsigned long int strtoul __P ((__const char *__nptr,
char **__endptr, int __base));
#if defined (__GNUC__) && defined (__USE_BSD)
/* Convert a string to a quadword integer. */
extern long long int strtoq __P ((__const char *__nptr, char **__endptr,
int __base));
/* Convert a string to an unsigned quadword integer. */
extern unsigned long long int strtouq __P ((__const char *__nptr,
char **__endptr, int __base));
#endif /* GCC and use BSD. */
#if defined (__GNUC__) && defined (__USE_MISC)
/* Convert a string to a quadword integer. */
extern long long int strtoll __P ((__const char *__nptr, char **__endptr,
int __base));
/* Convert a string to an unsigned quadword integer. */
extern unsigned long long int strtoull __P ((__const char *__nptr,
char **__endptr, int __base));
#endif /* GCC and use MISC. */
/* The internal entry points for `strtoX' take an extra flag argument
saying whether or not to parse locale-dependent number grouping. */
extern double __strtod_internal __P ((__const char *__nptr,
char **__endptr, int __group));
extern float __strtof_internal __P ((__const char *__nptr, char **__endptr,
int __group));
extern __long_double_t __strtold_internal __P ((__const char *__nptr,
char **__endptr, int __group));
extern long int __strtol_internal __P ((__const char *__nptr, char **__endptr,
int __base, int __group));
extern unsigned long int __strtoul_internal __P ((__const char *__nptr,
char **__endptr, int __base,
int __group));
#ifdef __GNUC__
extern long long int __strtoq_internal __P ((__const char *__nptr,
char **__endptr, int __base,
int __group));
extern unsigned long long int __strtouq_internal __P ((__const char *__nptr,
char **__endptr,
int __base,
int __group));
#endif /* GCC */
#if defined (__OPTIMIZE__) && __GNUC__ >= 2
/* Define inline functions which call the internal entry points. */
extern __inline double strtod (__const char *__nptr, char **__endptr)
{ return __strtod_internal (__nptr, __endptr, 0); }
extern __inline long int strtol (__const char *__nptr,
char **__endptr, int __base)
{ return __strtol_internal (__nptr, __endptr, __base, 0); }
extern __inline unsigned long int strtoul (__const char *__nptr,
char **__endptr, int __base)
{ return __strtoul_internal (__nptr, __endptr, __base, 0); }
#ifdef __USE_GNU
extern __inline float strtof (__const char *__nptr, char **__endptr)
{ return __strtof_internal (__nptr, __endptr, 0); }
extern __inline __long_double_t strtold (__const char *__nptr, char **__endptr)
{ return __strtold_internal (__nptr, __endptr, 0); }
#endif
#ifdef __USE_BSD
extern __inline long long int strtoq (__const char *__nptr, char **__endptr,
int __base)
{ return __strtoq_internal (__nptr, __endptr, __base, 0); }
extern __inline unsigned long long int strtouq (__const char *__nptr,
char **__endptr, int __base)
{ return __strtouq_internal (__nptr, __endptr, __base, 0); }
#endif
#ifdef __USE_MISC
extern __inline long long int strtoll (__const char *__nptr, char **__endptr,
int __base)
{ return __strtoq_internal (__nptr, __endptr, __base, 0); }
extern __inline unsigned long long int strtoull (__const char *__nptr,
char **__endptr, int __base)
{ return __strtouq_internal (__nptr, __endptr, __base, 0); }
#endif
extern __inline double atof (__const char *__nptr)
{ return strtod (__nptr, (char **) NULL); }
extern __inline int atoi (__const char *__nptr)
{ return (int) strtol (__nptr, (char **) NULL, 10); }
extern __inline long int atol (__const char *__nptr)
{ return strtol (__nptr, (char **) NULL, 10); }
#endif /* Optimizing GCC >=2. */
#ifdef __USE_SVID
/* Convert N to base 64 using the digits "./0-9A-Za-z", least-significant
digit first. Returns a pointer to static storage overwritten by the
next call. */
extern char *l64a __P ((long int __n));
/* Read a number from a string S in base 64 as above. */
extern long int a64l __P ((__const char *__s));
#endif
/* Return a random integer between 0 and RAND_MAX inclusive. */
extern int rand __P ((void));
/* Seed the random number generator with the given number. */
extern void srand __P ((unsigned int __seed));
#ifdef __USE_BSD
#include <sys/types.h> /* we need int32_t... */
/* These are the functions that actually do things. The `random', `srandom',
`initstate' and `setstate' functions are those from BSD Unices.
The `rand' and `srand' functions are required by the ANSI standard.
We provide both interfaces to the same random number generator. */
/* Return a random long integer between 0 and RAND_MAX inclusive. */
extern int32_t __random __P ((void));
extern int32_t random __P ((void));
/* Seed the random number generator with the given number. */
extern void __srandom __P ((unsigned int __seed));
extern void srandom __P ((unsigned int __seed));
/* Initialize the random number generator to use state buffer STATEBUF,
of length STATELEN, and seed it with SEED. Optimal lengths are 8, 16,
32, 64, 128 and 256, the bigger the better; values less than 8 will
cause an error and values greater than 256 will be rounded down. */
extern __ptr_t __initstate __P ((unsigned int __seed, __ptr_t __statebuf,
size_t __statelen));
extern __ptr_t initstate __P ((unsigned int __seed, __ptr_t __statebuf,
size_t __statelen));
/* Switch the random number generator to state buffer STATEBUF,
which should have been previously initialized by `initstate'. */
extern __ptr_t __setstate __P ((__ptr_t __statebuf));
extern __ptr_t setstate __P ((__ptr_t __statebuf));
#ifdef __USE_REENTRANT
/* Reentrant versions of the `random' family of functions.
These functions all use the following data structure to contain
state, rather than global state variables. */
struct random_data
{
int32_t *fptr; /* Front pointer. */
int32_t *rptr; /* Rear pointer. */
int32_t *state; /* Array of state values. */
int rand_type; /* Type of random number generator. */
int rand_deg; /* Degree of random number generator. */
int rand_sep; /* Distance between front and rear. */
int32_t *end_ptr; /* Pointer behind state table. */
};
extern int __random_r __P ((struct random_data *__buf, int32_t *__result));
extern int random_r __P ((struct random_data *__buf, int32_t *__result));
extern int __srandom_r __P ((unsigned int __seed, struct random_data *__buf));
extern int __initstate_r __P ((unsigned int __seed, __ptr_t __statebuf,
size_t __statelen, struct random_data *__buf));
extern int __setstate_r __P ((__ptr_t __statebuf, struct random_data *__buf));
extern int srandom_r __P ((unsigned int __seed, struct random_data *__buf));
extern int initstate_r __P ((unsigned int __seed, __ptr_t __statebuf,
size_t __statelen, struct random_data *__buf));
extern int setstate_r __P ((__ptr_t __statebuf, struct random_data *__buf));
#endif /* __USE_REENTRANT. */
#endif /* Use BSD. */
#ifdef __USE_SVID
/* System V style 48-bit random number generator functions. */
/* Data structure for communication with thread safe versions. */
struct drand48_data
{
unsigned short int X[3]; /* Current state. */
unsigned short int a[3]; /* Factor in congruential formula. */
unsigned short int c; /* Additive const. in congruential formula. */
unsigned short int old_X[3]; /* Old state. */
int init; /* Flag for initializing. */
};
/* Return non-negative, double-precision floating-point value in [0.0,1.0). */
extern double drand48 __P ((void));
extern int drand48_r __P ((struct drand48_data *__buffer, double *__result));
extern double erand48 __P ((unsigned short int __xsubi[3]));
extern int erand48_r __P ((unsigned short int __xsubi[3],
struct drand48_data *__buffer, double *__result));
/* Return non-negative, long integer in [0,2^31). */
extern long lrand48 __P ((void));
extern int lrand48_r __P ((struct drand48_data *__buffer, long *__result));
extern long nrand48 __P ((unsigned short int __xsubi[3]));
extern int nrand48_r __P ((unsigned short int __xsubi[3],
struct drand48_data *__buffer, long *__result));
/* Return signed, long integers in [-2^31,2^31). */
extern long mrand48 __P ((void));
extern int mrand48_r __P ((struct drand48_data *__buffer, long *__result));
extern long jrand48 __P ((unsigned short int __xsubi[3]));
extern int jrand48_r __P ((unsigned short int __xsubi[3],
struct drand48_data *__buffer, long *__result));
/* Seed random number generator. */
extern void srand48 __P ((long __seedval));
extern int srand48_r __P ((long __seedval, struct drand48_data *__buffer));
extern unsigned short int *seed48 __P ((unsigned short int __seed16v[3]));
extern int seed48_r __P ((unsigned short int __seed16v[3],
struct drand48_data *__buffer));
extern void lcong48 __P ((unsigned short int __param[7]));
extern int lcong48_r __P ((unsigned short int __param[7],
struct drand48_data *__buffer));
/* Internal function to compute next state of the generator. */
extern int __drand48_iterate __P ((unsigned short int __xsubi[3],
struct drand48_data *__buffer));
#endif /* __USE_SVID. */
/* Allocate SIZE bytes of memory. */
extern __ptr_t malloc __P ((size_t __size));
/* Re-allocate the previously allocated block
in __ptr_t, making the new block SIZE bytes long. */
extern __ptr_t realloc __P ((__ptr_t __ptr, size_t __size));
/* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */
extern __ptr_t calloc __P ((size_t __nmemb, size_t __size));
/* Free a block allocated by `malloc', `realloc' or `calloc'. */
extern void free __P ((__ptr_t __ptr));
#ifdef __USE_MISC
/* Free a block. An alias for `free'. (Sun Unices). */
extern void cfree __P ((__ptr_t __ptr));
#endif /* Use misc. */
#if defined(__USE_GNU) || defined(__USE_BSD) || defined(__USE_MISC)
#include <alloca.h>
#endif /* Use GNU, BSD, or misc. */
#ifdef __USE_BSD
/* Allocate SIZE bytes on a page boundary. The storage cannot be freed. */
extern __ptr_t valloc __P ((size_t __size));
#endif
/* Abort execution and generate a core-dump. */
extern void abort __P ((void)) __attribute__ ((__noreturn__));
/* Register a function to be called when `exit' is called. */
extern int atexit __P ((void (*__func) (void)));
#ifdef __USE_MISC
/* Register a function to be called with the status
given to `exit' and the given argument. */
extern int on_exit __P ((void (*__func) (int __status, __ptr_t __arg),
__ptr_t __arg));
#endif
/* Call all functions registered with `atexit' and `on_exit',
in the reverse of the order in which they were registered
perform stdio cleanup, and terminate program execution with STATUS. */
extern void exit __P ((int __status)) __attribute__ ((__noreturn__));
/* Return the value of envariable NAME, or NULL if it doesn't exist. */
extern char *getenv __P ((__const char *__name));
/* This function is similar to the above but returns NULL if the
programs is running with SUID or SGID enabled. */
extern char *__secure_getenv __P ((__const char *__name));
#ifdef __USE_SVID
/* The SVID says this is in <stdio.h>, but this seems a better place. */
/* Put STRING, which is of the form "NAME=VALUE", in the environment.
If there is no `=', remove NAME from the environment. */
extern int putenv __P ((__const char *__string));
#endif
#ifdef __USE_BSD
/* Set NAME to VALUE in the environment.
If REPLACE is nonzero, overwrite an existing value. */
extern int setenv __P ((__const char *__name, __const char *__value,
int __replace));
/* Remove the variable NAME from the environment. */
extern void unsetenv __P ((__const char *__name));
#endif
#ifdef __USE_MISC
/* The `clearenv' was planned to be added to POSIX.1 but probably
never made it. Nevertheless the POSIX.9 standard (POSIX bindings
for Fortran 77) requires this function. */
extern int clearenv __P ((void));
#endif
/* Execute the given line as a shell command. */
extern int system __P ((__const char *__command));
#ifdef __USE_GNU
/* Return a malloc'd string containing the canonical absolute name of the
named file. The last file name component need not exist, and may be a
symlink to a nonexistent file. */
extern char *canonicalize_file_name __P ((__const char *__name));
#endif
#ifdef __USE_BSD
/* Return the canonical absolute name of file NAME. The last file name
component need not exist, and may be a symlink to a nonexistent file.
If RESOLVED is null, the result is malloc'd; otherwise, if the canonical
name is PATH_MAX chars or more, returns null with `errno' set to
ENAMETOOLONG; if the name fits in fewer than PATH_MAX chars, returns the
name in RESOLVED. */
extern char *realpath __P ((__const char *__name, char *__resolved));
#endif
/* Shorthand for type of comparison functions. */
#ifndef __COMPAR_FN_T
#define __COMPAR_FN_T
typedef int (*__compar_fn_t) __P ((__const __ptr_t, __const __ptr_t));
#endif
#ifdef __USE_GNU
typedef __compar_fn_t comparison_fn_t;
#endif
/* Do a binary search for KEY in BASE, which consists of NMEMB elements
of SIZE bytes each, using COMPAR to perform the comparisons. */
extern __ptr_t bsearch __P ((__const __ptr_t __key, __const __ptr_t __base,
size_t __nmemb, size_t __size,
__compar_fn_t __compar));
/* Sort NMEMB elements of BASE, of SIZE bytes each,
using COMPAR to perform the comparisons. */
extern void qsort __P ((__ptr_t __base, size_t __nmemb, size_t __size,
__compar_fn_t __compar));
/* Return the absolute value of X. */
extern int abs __P ((int __x)) __attribute__ ((__const__));
extern long int labs __P ((long int __x)) __attribute__ ((__const__));
#ifdef __USE_GNU
extern long long int llabs __P ((long long int __x)) __attribute__ ((__const__));
#endif
/* Return the `div_t', `ldiv_t' or `lldiv_t' representation
of the value of NUMER over DENOM. */
/* GCC may have built-ins for these someday. */
extern div_t div __P ((int __numer, int __denom)) __attribute__ ((__const__));
extern ldiv_t ldiv __P ((long int __numer, long int __denom)) __attribute__ ((__const__));
#ifdef __USE_GNU
extern lldiv_t lldiv __P ((long long int __numer, long long int __denom)) __attribute__ ((__const__));
#endif
#ifdef __USE_SVID
/* Convert floating point numbers to strings. The returned values are
valid only until another call to the same function. */
/* Convert VALUE to a string with NDIGIT digits and return a pointer to
this. Set *DECPT with the position of the decimal character and *SIGN
with the sign of the number. */
char *ecvt __P ((double __value, int __ndigit, int *__decpt, int *__sign));
/* Convert VALUE to a string rounded to NDIGIT decimal digits. Set *DECPT
with the position of the decimal character and *SIGN with the sign of
the number. */
char *fcvt __P ((double __value, int __ndigit, int *__decpt, int *__sign));
/* If possible convert VALUE to a string with NDIGIT significant digits.
Otherwise use exponential representation. The resulting string will
be written to BUF. */
char *gcvt __P ((double __value, int __ndigit, char *__buf));
/* Long double versions of above functions. */
char *qecvt __P ((__long_double_t __value, int __ndigit, int *__decpt,
int *__sign));
char *qfcvt __P ((__long_double_t __value, int __ndigit, int *__decpt,
int *__sign));
char *qgcvt __P ((__long_double_t __value, int __ndigit, char *__buf));
#ifdef __USE_REENTRANT
/* Reentrant version of the functions above which provide their own
buffers. */
int ecvt_r __P ((double __value, int __ndigit, int *__decpt, int *__sign,
char *__buf, size_t __len));
int fcvt_r __P ((double __value, int __ndigit, int *__decpt, int *__sign,
char *__buf, size_t __len));
int qecvt_r __P ((__long_double_t __value, int __ndigit, int *__decpt,
int *__sign, char *__buf, size_t __len));
int qfcvt_r __P ((__long_double_t __value, int __ndigit, int *__decpt,
int *__sign, char *__buf, size_t __len));
#endif
#endif
/* Return the length of the multibyte character
in S, which is no longer than N. */
extern int mblen __P ((__const char *__s, size_t __n));
/* Return the length of the given multibyte character,
putting its `wchar_t' representation in *PWC. */
extern int mbtowc __P ((wchar_t *__pwc, __const char *__s, size_t __n));
/* Put the multibyte character represented
by WCHAR in S, returning its length. */
extern int wctomb __P ((char *__s, wchar_t __wchar));
#if defined (__OPTIMIZE__) && __GNUC__ >= 2
extern __inline int mblen (__const char *__s, size_t __n)
{ return mbtowc ((wchar_t *) NULL, __s, __n); }
#endif /* Optimizing GCC >=2. */
/* Convert a multibyte string to a wide char string. */
extern size_t mbstowcs __P ((wchar_t *__pwcs, __const char *__s, size_t __n));
/* Convert a wide char string to multibyte string. */
extern size_t wcstombs __P ((char *__s, __const wchar_t *__pwcs, size_t __n));
#ifdef __USE_SVID
/* Determine whether the string value of RESPONSE matches the affirmation
or negative response expression as specified by the LC_MESSAGES category
in the program's current locale. Returns 1 if affirmative, 0 if
negative, and -1 if not matching. */
extern int rpmatch __P ((__const char *__response));
#endif
#ifdef __USE_MISC
/* Parse comma separated suboption from *OPTIONP and match against
strings in TOKENS. If found return index and set *VALUEP to
optional value introduced by an equal sign. If the suboption is
not part of TOKENS return in *VALUEP beginning of unknown
suboption. On exit *OPTIONP is set to the beginning of the next
otken or at the terminating NUL character. */
extern int getsubopt __P ((char **__optionp, __const char *__const *__tokens,
char **__valuep));
#endif
__END_DECLS
#endif /* stdlib.h */
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