1/* Copyright (C) 1991-2020 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, see
16 <https://www.gnu.org/licenses/>. */
17
18/*
19 * ISO C99 Standard: 7.20 General utilities <stdlib.h>
20 */
21
22#ifndef _STDLIB_H
23
24#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
25#include <bits/libc-header-start.h>
26
27/* Get size_t, wchar_t and NULL from <stddef.h>. */
28#define __need_size_t
29#define __need_wchar_t
30#define __need_NULL
31#include <stddef.h>
32
33__BEGIN_DECLS
34
35#define _STDLIB_H 1
36
37#if (defined __USE_XOPEN || defined __USE_XOPEN2K8) && !defined _SYS_WAIT_H
38/* XPG requires a few symbols from <sys/wait.h> being defined. */
39# include <bits/waitflags.h>
40# include <bits/waitstatus.h>
41
42/* Define the macros <sys/wait.h> also would define this way. */
43# define WEXITSTATUS(status) __WEXITSTATUS (status)
44# define WTERMSIG(status) __WTERMSIG (status)
45# define WSTOPSIG(status) __WSTOPSIG (status)
46# define WIFEXITED(status) __WIFEXITED (status)
47# define WIFSIGNALED(status) __WIFSIGNALED (status)
48# define WIFSTOPPED(status) __WIFSTOPPED (status)
49# ifdef __WIFCONTINUED
50# define WIFCONTINUED(status) __WIFCONTINUED (status)
51# endif
52#endif /* X/Open or XPG7 and <sys/wait.h> not included. */
53
54/* _FloatN API tests for enablement. */
55#include <bits/floatn.h>
56
57/* Returned by `div'. */
58typedef struct
59 {
60 int quot; /* Quotient. */
61 int rem; /* Remainder. */
62 } div_t;
63
64/* Returned by `ldiv'. */
65#ifndef __ldiv_t_defined
66typedef struct
67 {
68 long int quot; /* Quotient. */
69 long int rem; /* Remainder. */
70 } ldiv_t;
71# define __ldiv_t_defined 1
72#endif
73
74#if defined __USE_ISOC99 && !defined __lldiv_t_defined
75/* Returned by `lldiv'. */
76__extension__ typedef struct
77 {
78 long long int quot; /* Quotient. */
79 long long int rem; /* Remainder. */
80 } lldiv_t;
81# define __lldiv_t_defined 1
82#endif
83
84
85/* The largest number rand will return (same as INT_MAX). */
86#define RAND_MAX 2147483647
87
88
89/* We define these the same for all machines.
90 Changes from this to the outside world should be done in `_exit'. */
91#define EXIT_FAILURE 1 /* Failing exit status. */
92#define EXIT_SUCCESS 0 /* Successful exit status. */
93
94
95/* Maximum length of a multibyte character in the current locale. */
96#define MB_CUR_MAX (__ctype_get_mb_cur_max ())
97extern size_t __ctype_get_mb_cur_max (void) __THROW __wur;
98
99
100/* Convert a string to a floating-point number. */
101extern double atof (const char *__nptr)
102 __THROW __attribute_pure__ __nonnull ((1)) __wur;
103/* Convert a string to an integer. */
104extern int atoi (const char *__nptr)
105 __THROW __attribute_pure__ __nonnull ((1)) __wur;
106/* Convert a string to a long integer. */
107extern long int atol (const char *__nptr)
108 __THROW __attribute_pure__ __nonnull ((1)) __wur;
109
110#ifdef __USE_ISOC99
111/* Convert a string to a long long integer. */
112__extension__ extern long long int atoll (const char *__nptr)
113 __THROW __attribute_pure__ __nonnull ((1)) __wur;
114#endif
115
116/* Convert a string to a floating-point number. */
117extern double strtod (const char *__restrict __nptr,
118 char **__restrict __endptr)
119 __THROW __nonnull ((1));
120
121#ifdef __USE_ISOC99
122/* Likewise for `float' and `long double' sizes of floating-point numbers. */
123extern float strtof (const char *__restrict __nptr,
124 char **__restrict __endptr) __THROW __nonnull ((1));
125
126extern long double strtold (const char *__restrict __nptr,
127 char **__restrict __endptr)
128 __THROW __nonnull ((1));
129#endif
130
131/* Likewise for '_FloatN' and '_FloatNx'. */
132
133#if __HAVE_FLOAT16 && __GLIBC_USE (IEC_60559_TYPES_EXT)
134extern _Float16 strtof16 (const char *__restrict __nptr,
135 char **__restrict __endptr)
136 __THROW __nonnull ((1));
137#endif
138
139#if __HAVE_FLOAT32 && __GLIBC_USE (IEC_60559_TYPES_EXT)
140extern _Float32 strtof32 (const char *__restrict __nptr,
141 char **__restrict __endptr)
142 __THROW __nonnull ((1));
143#endif
144
145#if __HAVE_FLOAT64 && __GLIBC_USE (IEC_60559_TYPES_EXT)
146extern _Float64 strtof64 (const char *__restrict __nptr,
147 char **__restrict __endptr)
148 __THROW __nonnull ((1));
149#endif
150
151#if __HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)
152extern _Float128 strtof128 (const char *__restrict __nptr,
153 char **__restrict __endptr)
154 __THROW __nonnull ((1));
155#endif
156
157#if __HAVE_FLOAT32X && __GLIBC_USE (IEC_60559_TYPES_EXT)
158extern _Float32x strtof32x (const char *__restrict __nptr,
159 char **__restrict __endptr)
160 __THROW __nonnull ((1));
161#endif
162
163#if __HAVE_FLOAT64X && __GLIBC_USE (IEC_60559_TYPES_EXT)
164extern _Float64x strtof64x (const char *__restrict __nptr,
165 char **__restrict __endptr)
166 __THROW __nonnull ((1));
167#endif
168
169#if __HAVE_FLOAT128X && __GLIBC_USE (IEC_60559_TYPES_EXT)
170extern _Float128x strtof128x (const char *__restrict __nptr,
171 char **__restrict __endptr)
172 __THROW __nonnull ((1));
173#endif
174
175/* Convert a string to a long integer. */
176extern long int strtol (const char *__restrict __nptr,
177 char **__restrict __endptr, int __base)
178 __THROW __nonnull ((1));
179/* Convert a string to an unsigned long integer. */
180extern unsigned long int strtoul (const char *__restrict __nptr,
181 char **__restrict __endptr, int __base)
182 __THROW __nonnull ((1));
183
184#ifdef __USE_MISC
185/* Convert a string to a quadword integer. */
186__extension__
187extern long long int strtoq (const char *__restrict __nptr,
188 char **__restrict __endptr, int __base)
189 __THROW __nonnull ((1));
190/* Convert a string to an unsigned quadword integer. */
191__extension__
192extern unsigned long long int strtouq (const char *__restrict __nptr,
193 char **__restrict __endptr, int __base)
194 __THROW __nonnull ((1));
195#endif /* Use misc. */
196
197#ifdef __USE_ISOC99
198/* Convert a string to a quadword integer. */
199__extension__
200extern long long int strtoll (const char *__restrict __nptr,
201 char **__restrict __endptr, int __base)
202 __THROW __nonnull ((1));
203/* Convert a string to an unsigned quadword integer. */
204__extension__
205extern unsigned long long int strtoull (const char *__restrict __nptr,
206 char **__restrict __endptr, int __base)
207 __THROW __nonnull ((1));
208#endif /* ISO C99 or use MISC. */
209
210/* Convert a floating-point number to a string. */
211#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
212extern int strfromd (char *__dest, size_t __size, const char *__format,
213 double __f)
214 __THROW __nonnull ((3));
215
216extern int strfromf (char *__dest, size_t __size, const char *__format,
217 float __f)
218 __THROW __nonnull ((3));
219
220extern int strfroml (char *__dest, size_t __size, const char *__format,
221 long double __f)
222 __THROW __nonnull ((3));
223#endif
224
225#if __HAVE_FLOAT16 && __GLIBC_USE (IEC_60559_TYPES_EXT)
226extern int strfromf16 (char *__dest, size_t __size, const char * __format,
227 _Float16 __f)
228 __THROW __nonnull ((3));
229#endif
230
231#if __HAVE_FLOAT32 && __GLIBC_USE (IEC_60559_TYPES_EXT)
232extern int strfromf32 (char *__dest, size_t __size, const char * __format,
233 _Float32 __f)
234 __THROW __nonnull ((3));
235#endif
236
237#if __HAVE_FLOAT64 && __GLIBC_USE (IEC_60559_TYPES_EXT)
238extern int strfromf64 (char *__dest, size_t __size, const char * __format,
239 _Float64 __f)
240 __THROW __nonnull ((3));
241#endif
242
243#if __HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)
244extern int strfromf128 (char *__dest, size_t __size, const char * __format,
245 _Float128 __f)
246 __THROW __nonnull ((3));
247#endif
248
249#if __HAVE_FLOAT32X && __GLIBC_USE (IEC_60559_TYPES_EXT)
250extern int strfromf32x (char *__dest, size_t __size, const char * __format,
251 _Float32x __f)
252 __THROW __nonnull ((3));
253#endif
254
255#if __HAVE_FLOAT64X && __GLIBC_USE (IEC_60559_TYPES_EXT)
256extern int strfromf64x (char *__dest, size_t __size, const char * __format,
257 _Float64x __f)
258 __THROW __nonnull ((3));
259#endif
260
261#if __HAVE_FLOAT128X && __GLIBC_USE (IEC_60559_TYPES_EXT)
262extern int strfromf128x (char *__dest, size_t __size, const char * __format,
263 _Float128x __f)
264 __THROW __nonnull ((3));
265#endif
266
267
268#ifdef __USE_GNU
269/* Parallel versions of the functions above which take the locale to
270 use as an additional parameter. These are GNU extensions inspired
271 by the POSIX.1-2008 extended locale API. */
272# include <bits/types/locale_t.h>
273
274extern long int strtol_l (const char *__restrict __nptr,
275 char **__restrict __endptr, int __base,
276 locale_t __loc) __THROW __nonnull ((1, 4));
277
278extern unsigned long int strtoul_l (const char *__restrict __nptr,
279 char **__restrict __endptr,
280 int __base, locale_t __loc)
281 __THROW __nonnull ((1, 4));
282
283__extension__
284extern long long int strtoll_l (const char *__restrict __nptr,
285 char **__restrict __endptr, int __base,
286 locale_t __loc)
287 __THROW __nonnull ((1, 4));
288
289__extension__
290extern unsigned long long int strtoull_l (const char *__restrict __nptr,
291 char **__restrict __endptr,
292 int __base, locale_t __loc)
293 __THROW __nonnull ((1, 4));
294
295extern double strtod_l (const char *__restrict __nptr,
296 char **__restrict __endptr, locale_t __loc)
297 __THROW __nonnull ((1, 3));
298
299extern float strtof_l (const char *__restrict __nptr,
300 char **__restrict __endptr, locale_t __loc)
301 __THROW __nonnull ((1, 3));
302
303extern long double strtold_l (const char *__restrict __nptr,
304 char **__restrict __endptr,
305 locale_t __loc)
306 __THROW __nonnull ((1, 3));
307
308# if __HAVE_FLOAT16
309extern _Float16 strtof16_l (const char *__restrict __nptr,
310 char **__restrict __endptr,
311 locale_t __loc)
312 __THROW __nonnull ((1, 3));
313# endif
314
315# if __HAVE_FLOAT32
316extern _Float32 strtof32_l (const char *__restrict __nptr,
317 char **__restrict __endptr,
318 locale_t __loc)
319 __THROW __nonnull ((1, 3));
320# endif
321
322# if __HAVE_FLOAT64
323extern _Float64 strtof64_l (const char *__restrict __nptr,
324 char **__restrict __endptr,
325 locale_t __loc)
326 __THROW __nonnull ((1, 3));
327# endif
328
329# if __HAVE_FLOAT128
330extern _Float128 strtof128_l (const char *__restrict __nptr,
331 char **__restrict __endptr,
332 locale_t __loc)
333 __THROW __nonnull ((1, 3));
334# endif
335
336# if __HAVE_FLOAT32X
337extern _Float32x strtof32x_l (const char *__restrict __nptr,
338 char **__restrict __endptr,
339 locale_t __loc)
340 __THROW __nonnull ((1, 3));
341# endif
342
343# if __HAVE_FLOAT64X
344extern _Float64x strtof64x_l (const char *__restrict __nptr,
345 char **__restrict __endptr,
346 locale_t __loc)
347 __THROW __nonnull ((1, 3));
348# endif
349
350# if __HAVE_FLOAT128X
351extern _Float128x strtof128x_l (const char *__restrict __nptr,
352 char **__restrict __endptr,
353 locale_t __loc)
354 __THROW __nonnull ((1, 3));
355# endif
356#endif /* GNU */
357
358
359#ifdef __USE_EXTERN_INLINES
360__extern_inline int
361__NTH (atoi (const char *__nptr))
362{
363 return (int) strtol (__nptr, (char **) NULL, 10);
364}
365__extern_inline long int
366__NTH (atol (const char *__nptr))
367{
368 return strtol (__nptr, (char **) NULL, 10);
369}
370
371# ifdef __USE_ISOC99
372__extension__ __extern_inline long long int
373__NTH (atoll (const char *__nptr))
374{
375 return strtoll (__nptr, (char **) NULL, 10);
376}
377# endif
378#endif /* Optimizing and Inlining. */
379
380
381#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
382/* Convert N to base 64 using the digits "./0-9A-Za-z", least-significant
383 digit first. Returns a pointer to static storage overwritten by the
384 next call. */
385extern char *l64a (long int __n) __THROW __wur;
386
387/* Read a number from a string S in base 64 as above. */
388extern long int a64l (const char *__s)
389 __THROW __attribute_pure__ __nonnull ((1)) __wur;
390
391#endif /* Use misc || extended X/Open. */
392
393#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
394# include <sys/types.h> /* we need int32_t... */
395
396/* These are the functions that actually do things. The `random', `srandom',
397 `initstate' and `setstate' functions are those from BSD Unices.
398 The `rand' and `srand' functions are required by the ANSI standard.
399 We provide both interfaces to the same random number generator. */
400/* Return a random long integer between 0 and RAND_MAX inclusive. */
401extern long int random (void) __THROW;
402
403/* Seed the random number generator with the given number. */
404extern void srandom (unsigned int __seed) __THROW;
405
406/* Initialize the random number generator to use state buffer STATEBUF,
407 of length STATELEN, and seed it with SEED. Optimal lengths are 8, 16,
408 32, 64, 128 and 256, the bigger the better; values less than 8 will
409 cause an error and values greater than 256 will be rounded down. */
410extern char *initstate (unsigned int __seed, char *__statebuf,
411 size_t __statelen) __THROW __nonnull ((2));
412
413/* Switch the random number generator to state buffer STATEBUF,
414 which should have been previously initialized by `initstate'. */
415extern char *setstate (char *__statebuf) __THROW __nonnull ((1));
416
417
418# ifdef __USE_MISC
419/* Reentrant versions of the `random' family of functions.
420 These functions all use the following data structure to contain
421 state, rather than global state variables. */
422
423struct random_data
424 {
425 int32_t *fptr; /* Front pointer. */
426 int32_t *rptr; /* Rear pointer. */
427 int32_t *state; /* Array of state values. */
428 int rand_type; /* Type of random number generator. */
429 int rand_deg; /* Degree of random number generator. */
430 int rand_sep; /* Distance between front and rear. */
431 int32_t *end_ptr; /* Pointer behind state table. */
432 };
433
434extern int random_r (struct random_data *__restrict __buf,
435 int32_t *__restrict __result) __THROW __nonnull ((1, 2));
436
437extern int srandom_r (unsigned int __seed, struct random_data *__buf)
438 __THROW __nonnull ((2));
439
440extern int initstate_r (unsigned int __seed, char *__restrict __statebuf,
441 size_t __statelen,
442 struct random_data *__restrict __buf)
443 __THROW __nonnull ((2, 4));
444
445extern int setstate_r (char *__restrict __statebuf,
446 struct random_data *__restrict __buf)
447 __THROW __nonnull ((1, 2));
448# endif /* Use misc. */
449#endif /* Use extended X/Open || misc. */
450
451
452/* Return a random integer between 0 and RAND_MAX inclusive. */
453extern int rand (void) __THROW;
454/* Seed the random number generator with the given number. */
455extern void srand (unsigned int __seed) __THROW;
456
457#ifdef __USE_POSIX199506
458/* Reentrant interface according to POSIX.1. */
459extern int rand_r (unsigned int *__seed) __THROW;
460#endif
461
462
463#if defined __USE_MISC || defined __USE_XOPEN
464/* System V style 48-bit random number generator functions. */
465
466/* Return non-negative, double-precision floating-point value in [0.0,1.0). */
467extern double drand48 (void) __THROW;
468extern double erand48 (unsigned short int __xsubi[3]) __THROW __nonnull ((1));
469
470/* Return non-negative, long integer in [0,2^31). */
471extern long int lrand48 (void) __THROW;
472extern long int nrand48 (unsigned short int __xsubi[3])
473 __THROW __nonnull ((1));
474
475/* Return signed, long integers in [-2^31,2^31). */
476extern long int mrand48 (void) __THROW;
477extern long int jrand48 (unsigned short int __xsubi[3])
478 __THROW __nonnull ((1));
479
480/* Seed random number generator. */
481extern void srand48 (long int __seedval) __THROW;
482extern unsigned short int *seed48 (unsigned short int __seed16v[3])
483 __THROW __nonnull ((1));
484extern void lcong48 (unsigned short int __param[7]) __THROW __nonnull ((1));
485
486# ifdef __USE_MISC
487/* Data structure for communication with thread safe versions. This
488 type is to be regarded as opaque. It's only exported because users
489 have to allocate objects of this type. */
490struct drand48_data
491 {
492 unsigned short int __x[3]; /* Current state. */
493 unsigned short int __old_x[3]; /* Old state. */
494 unsigned short int __c; /* Additive const. in congruential formula. */
495 unsigned short int __init; /* Flag for initializing. */
496 __extension__ unsigned long long int __a; /* Factor in congruential
497 formula. */
498 };
499
500/* Return non-negative, double-precision floating-point value in [0.0,1.0). */
501extern int drand48_r (struct drand48_data *__restrict __buffer,
502 double *__restrict __result) __THROW __nonnull ((1, 2));
503extern int erand48_r (unsigned short int __xsubi[3],
504 struct drand48_data *__restrict __buffer,
505 double *__restrict __result) __THROW __nonnull ((1, 2));
506
507/* Return non-negative, long integer in [0,2^31). */
508extern int lrand48_r (struct drand48_data *__restrict __buffer,
509 long int *__restrict __result)
510 __THROW __nonnull ((1, 2));
511extern int nrand48_r (unsigned short int __xsubi[3],
512 struct drand48_data *__restrict __buffer,
513 long int *__restrict __result)
514 __THROW __nonnull ((1, 2));
515
516/* Return signed, long integers in [-2^31,2^31). */
517extern int mrand48_r (struct drand48_data *__restrict __buffer,
518 long int *__restrict __result)
519 __THROW __nonnull ((1, 2));
520extern int jrand48_r (unsigned short int __xsubi[3],
521 struct drand48_data *__restrict __buffer,
522 long int *__restrict __result)
523 __THROW __nonnull ((1, 2));
524
525/* Seed random number generator. */
526extern int srand48_r (long int __seedval, struct drand48_data *__buffer)
527 __THROW __nonnull ((2));
528
529extern int seed48_r (unsigned short int __seed16v[3],
530 struct drand48_data *__buffer) __THROW __nonnull ((1, 2));
531
532extern int lcong48_r (unsigned short int __param[7],
533 struct drand48_data *__buffer)
534 __THROW __nonnull ((1, 2));
535# endif /* Use misc. */
536#endif /* Use misc or X/Open. */
537
538/* Allocate SIZE bytes of memory. */
539extern void *malloc (size_t __size) __THROW __attribute_malloc__
540 __attribute_alloc_size__ ((1)) __wur;
541/* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */
542extern void *calloc (size_t __nmemb, size_t __size)
543 __THROW __attribute_malloc__ __attribute_alloc_size__ ((1, 2)) __wur;
544
545/* Re-allocate the previously allocated block
546 in PTR, making the new block SIZE bytes long. */
547/* __attribute_malloc__ is not used, because if realloc returns
548 the same pointer that was passed to it, aliasing needs to be allowed
549 between objects pointed by the old and new pointers. */
550extern void *realloc (void *__ptr, size_t __size)
551 __THROW __attribute_warn_unused_result__ __attribute_alloc_size__ ((2));
552
553#ifdef __USE_MISC
554/* Re-allocate the previously allocated block in PTR, making the new
555 block large enough for NMEMB elements of SIZE bytes each. */
556/* __attribute_malloc__ is not used, because if reallocarray returns
557 the same pointer that was passed to it, aliasing needs to be allowed
558 between objects pointed by the old and new pointers. */
559extern void *reallocarray (void *__ptr, size_t __nmemb, size_t __size)
560 __THROW __attribute_warn_unused_result__
561 __attribute_alloc_size__ ((2, 3));
562#endif
563
564/* Free a block allocated by `malloc', `realloc' or `calloc'. */
565extern void free (void *__ptr) __THROW;
566
567#ifdef __USE_MISC
568# include <alloca.h>
569#endif /* Use misc. */
570
571#if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K) \
572 || defined __USE_MISC
573/* Allocate SIZE bytes on a page boundary. The storage cannot be freed. */
574extern void *valloc (size_t __size) __THROW __attribute_malloc__
575 __attribute_alloc_size__ ((1)) __wur;
576#endif
577
578#ifdef __USE_XOPEN2K
579/* Allocate memory of SIZE bytes with an alignment of ALIGNMENT. */
580extern int posix_memalign (void **__memptr, size_t __alignment, size_t __size)
581 __THROW __nonnull ((1)) __wur;
582#endif
583
584#ifdef __USE_ISOC11
585/* ISO C variant of aligned allocation. */
586extern void *aligned_alloc (size_t __alignment, size_t __size)
587 __THROW __attribute_malloc__ __attribute_alloc_size__ ((2)) __wur;
588#endif
589
590/* Abort execution and generate a core-dump. */
591extern void abort (void) __THROW __attribute__ ((__noreturn__));
592
593
594/* Register a function to be called when `exit' is called. */
595extern int atexit (void (*__func) (void)) __THROW __nonnull ((1));
596
597#if defined __USE_ISOC11 || defined __USE_ISOCXX11
598/* Register a function to be called when `quick_exit' is called. */
599# ifdef __cplusplus
600extern "C++" int at_quick_exit (void (*__func) (void))
601 __THROW __asm ("at_quick_exit") __nonnull ((1));
602# else
603extern int at_quick_exit (void (*__func) (void)) __THROW __nonnull ((1));
604# endif
605#endif
606
607#ifdef __USE_MISC
608/* Register a function to be called with the status
609 given to `exit' and the given argument. */
610extern int on_exit (void (*__func) (int __status, void *__arg), void *__arg)
611 __THROW __nonnull ((1));
612#endif
613
614/* Call all functions registered with `atexit' and `on_exit',
615 in the reverse of the order in which they were registered,
616 perform stdio cleanup, and terminate program execution with STATUS. */
617extern void exit (int __status) __THROW __attribute__ ((__noreturn__));
618
619#if defined __USE_ISOC11 || defined __USE_ISOCXX11
620/* Call all functions registered with `at_quick_exit' in the reverse
621 of the order in which they were registered and terminate program
622 execution with STATUS. */
623extern void quick_exit (int __status) __THROW __attribute__ ((__noreturn__));
624#endif
625
626#ifdef __USE_ISOC99
627/* Terminate the program with STATUS without calling any of the
628 functions registered with `atexit' or `on_exit'. */
629extern void _Exit (int __status) __THROW __attribute__ ((__noreturn__));
630#endif
631
632
633/* Return the value of envariable NAME, or NULL if it doesn't exist. */
634extern char *getenv (const char *__name) __THROW __nonnull ((1)) __wur;
635
636#ifdef __USE_GNU
637/* This function is similar to the above but returns NULL if the
638 programs is running with SUID or SGID enabled. */
639extern char *secure_getenv (const char *__name)
640 __THROW __nonnull ((1)) __wur;
641#endif
642
643#if defined __USE_MISC || defined __USE_XOPEN
644/* The SVID says this is in <stdio.h>, but this seems a better place. */
645/* Put STRING, which is of the form "NAME=VALUE", in the environment.
646 If there is no `=', remove NAME from the environment. */
647extern int putenv (char *__string) __THROW __nonnull ((1));
648#endif
649
650#ifdef __USE_XOPEN2K
651/* Set NAME to VALUE in the environment.
652 If REPLACE is nonzero, overwrite an existing value. */
653extern int setenv (const char *__name, const char *__value, int __replace)
654 __THROW __nonnull ((2));
655
656/* Remove the variable NAME from the environment. */
657extern int unsetenv (const char *__name) __THROW __nonnull ((1));
658#endif
659
660#ifdef __USE_MISC
661/* The `clearenv' was planned to be added to POSIX.1 but probably
662 never made it. Nevertheless the POSIX.9 standard (POSIX bindings
663 for Fortran 77) requires this function. */
664extern int clearenv (void) __THROW;
665#endif
666
667
668#if defined __USE_MISC \
669 || (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8)
670/* Generate a unique temporary file name from TEMPLATE.
671 The last six characters of TEMPLATE must be "XXXXXX";
672 they are replaced with a string that makes the file name unique.
673 Always returns TEMPLATE, it's either a temporary file name or a null
674 string if it cannot get a unique file name. */
675extern char *mktemp (char *__template) __THROW __nonnull ((1));
676#endif
677
678#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
679/* Generate a unique temporary file name from TEMPLATE.
680 The last six characters of TEMPLATE must be "XXXXXX";
681 they are replaced with a string that makes the filename unique.
682 Returns a file descriptor open on the file for reading and writing,
683 or -1 if it cannot create a uniquely-named file.
684
685 This function is a possible cancellation point and therefore not
686 marked with __THROW. */
687# ifndef __USE_FILE_OFFSET64
688extern int mkstemp (char *__template) __nonnull ((1)) __wur;
689# else
690# ifdef __REDIRECT
691extern int __REDIRECT (mkstemp, (char *__template), mkstemp64)
692 __nonnull ((1)) __wur;
693# else
694# define mkstemp mkstemp64
695# endif
696# endif
697# ifdef __USE_LARGEFILE64
698extern int mkstemp64 (char *__template) __nonnull ((1)) __wur;
699# endif
700#endif
701
702#ifdef __USE_MISC
703/* Similar to mkstemp, but the template can have a suffix after the
704 XXXXXX. The length of the suffix is specified in the second
705 parameter.
706
707 This function is a possible cancellation point and therefore not
708 marked with __THROW. */
709# ifndef __USE_FILE_OFFSET64
710extern int mkstemps (char *__template, int __suffixlen) __nonnull ((1)) __wur;
711# else
712# ifdef __REDIRECT
713extern int __REDIRECT (mkstemps, (char *__template, int __suffixlen),
714 mkstemps64) __nonnull ((1)) __wur;
715# else
716# define mkstemps mkstemps64
717# endif
718# endif
719# ifdef __USE_LARGEFILE64
720extern int mkstemps64 (char *__template, int __suffixlen)
721 __nonnull ((1)) __wur;
722# endif
723#endif
724
725#ifdef __USE_XOPEN2K8
726/* Create a unique temporary directory from TEMPLATE.
727 The last six characters of TEMPLATE must be "XXXXXX";
728 they are replaced with a string that makes the directory name unique.
729 Returns TEMPLATE, or a null pointer if it cannot get a unique name.
730 The directory is created mode 700. */
731extern char *mkdtemp (char *__template) __THROW __nonnull ((1)) __wur;
732#endif
733
734#ifdef __USE_GNU
735/* Generate a unique temporary file name from TEMPLATE similar to
736 mkstemp. But allow the caller to pass additional flags which are
737 used in the open call to create the file..
738
739 This function is a possible cancellation point and therefore not
740 marked with __THROW. */
741# ifndef __USE_FILE_OFFSET64
742extern int mkostemp (char *__template, int __flags) __nonnull ((1)) __wur;
743# else
744# ifdef __REDIRECT
745extern int __REDIRECT (mkostemp, (char *__template, int __flags), mkostemp64)
746 __nonnull ((1)) __wur;
747# else
748# define mkostemp mkostemp64
749# endif
750# endif
751# ifdef __USE_LARGEFILE64
752extern int mkostemp64 (char *__template, int __flags) __nonnull ((1)) __wur;
753# endif
754
755/* Similar to mkostemp, but the template can have a suffix after the
756 XXXXXX. The length of the suffix is specified in the second
757 parameter.
758
759 This function is a possible cancellation point and therefore not
760 marked with __THROW. */
761# ifndef __USE_FILE_OFFSET64
762extern int mkostemps (char *__template, int __suffixlen, int __flags)
763 __nonnull ((1)) __wur;
764# else
765# ifdef __REDIRECT
766extern int __REDIRECT (mkostemps, (char *__template, int __suffixlen,
767 int __flags), mkostemps64)
768 __nonnull ((1)) __wur;
769# else
770# define mkostemps mkostemps64
771# endif
772# endif
773# ifdef __USE_LARGEFILE64
774extern int mkostemps64 (char *__template, int __suffixlen, int __flags)
775 __nonnull ((1)) __wur;
776# endif
777#endif
778
779
780/* Execute the given line as a shell command.
781
782 This function is a cancellation point and therefore not marked with
783 __THROW. */
784extern int system (const char *__command) __wur;
785
786
787#ifdef __USE_GNU
788/* Return a malloc'd string containing the canonical absolute name of the
789 existing named file. */
790extern char *canonicalize_file_name (const char *__name)
791 __THROW __nonnull ((1)) __wur;
792#endif
793
794#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
795/* Return the canonical absolute name of file NAME. If RESOLVED is
796 null, the result is malloc'd; otherwise, if the canonical name is
797 PATH_MAX chars or more, returns null with `errno' set to
798 ENAMETOOLONG; if the name fits in fewer than PATH_MAX chars,
799 returns the name in RESOLVED. */
800extern char *realpath (const char *__restrict __name,
801 char *__restrict __resolved) __THROW __wur;
802#endif
803
804
805/* Shorthand for type of comparison functions. */
806#ifndef __COMPAR_FN_T
807# define __COMPAR_FN_T
808typedef int (*__compar_fn_t) (const void *, const void *);
809
810# ifdef __USE_GNU
811typedef __compar_fn_t comparison_fn_t;
812# endif
813#endif
814#ifdef __USE_GNU
815typedef int (*__compar_d_fn_t) (const void *, const void *, void *);
816#endif
817
818/* Do a binary search for KEY in BASE, which consists of NMEMB elements
819 of SIZE bytes each, using COMPAR to perform the comparisons. */
820extern void *bsearch (const void *__key, const void *__base,
821 size_t __nmemb, size_t __size, __compar_fn_t __compar)
822 __nonnull ((1, 2, 5)) __wur;
823
824#ifdef __USE_EXTERN_INLINES
825# include <bits/stdlib-bsearch.h>
826#endif
827
828/* Sort NMEMB elements of BASE, of SIZE bytes each,
829 using COMPAR to perform the comparisons. */
830extern void qsort (void *__base, size_t __nmemb, size_t __size,
831 __compar_fn_t __compar) __nonnull ((1, 4));
832#ifdef __USE_GNU
833extern void qsort_r (void *__base, size_t __nmemb, size_t __size,
834 __compar_d_fn_t __compar, void *__arg)
835 __nonnull ((1, 4));
836#endif
837
838
839/* Return the absolute value of X. */
840extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
841extern long int labs (long int __x) __THROW __attribute__ ((__const__)) __wur;
842
843#ifdef __USE_ISOC99
844__extension__ extern long long int llabs (long long int __x)
845 __THROW __attribute__ ((__const__)) __wur;
846#endif
847
848
849/* Return the `div_t', `ldiv_t' or `lldiv_t' representation
850 of the value of NUMER over DENOM. */
851/* GCC may have built-ins for these someday. */
852extern div_t div (int __numer, int __denom)
853 __THROW __attribute__ ((__const__)) __wur;
854extern ldiv_t ldiv (long int __numer, long int __denom)
855 __THROW __attribute__ ((__const__)) __wur;
856
857#ifdef __USE_ISOC99
858__extension__ extern lldiv_t lldiv (long long int __numer,
859 long long int __denom)
860 __THROW __attribute__ ((__const__)) __wur;
861#endif
862
863
864#if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \
865 || defined __USE_MISC
866/* Convert floating point numbers to strings. The returned values are
867 valid only until another call to the same function. */
868
869/* Convert VALUE to a string with NDIGIT digits and return a pointer to
870 this. Set *DECPT with the position of the decimal character and *SIGN
871 with the sign of the number. */
872extern char *ecvt (double __value, int __ndigit, int *__restrict __decpt,
873 int *__restrict __sign) __THROW __nonnull ((3, 4)) __wur;
874
875/* Convert VALUE to a string rounded to NDIGIT decimal digits. Set *DECPT
876 with the position of the decimal character and *SIGN with the sign of
877 the number. */
878extern char *fcvt (double __value, int __ndigit, int *__restrict __decpt,
879 int *__restrict __sign) __THROW __nonnull ((3, 4)) __wur;
880
881/* If possible convert VALUE to a string with NDIGIT significant digits.
882 Otherwise use exponential representation. The resulting string will
883 be written to BUF. */
884extern char *gcvt (double __value, int __ndigit, char *__buf)
885 __THROW __nonnull ((3)) __wur;
886#endif
887
888#ifdef __USE_MISC
889/* Long double versions of above functions. */
890extern char *qecvt (long double __value, int __ndigit,
891 int *__restrict __decpt, int *__restrict __sign)
892 __THROW __nonnull ((3, 4)) __wur;
893extern char *qfcvt (long double __value, int __ndigit,
894 int *__restrict __decpt, int *__restrict __sign)
895 __THROW __nonnull ((3, 4)) __wur;
896extern char *qgcvt (long double __value, int __ndigit, char *__buf)
897 __THROW __nonnull ((3)) __wur;
898
899
900/* Reentrant version of the functions above which provide their own
901 buffers. */
902extern int ecvt_r (double __value, int __ndigit, int *__restrict __decpt,
903 int *__restrict __sign, char *__restrict __buf,
904 size_t __len) __THROW __nonnull ((3, 4, 5));
905extern int fcvt_r (double __value, int __ndigit, int *__restrict __decpt,
906 int *__restrict __sign, char *__restrict __buf,
907 size_t __len) __THROW __nonnull ((3, 4, 5));
908
909extern int qecvt_r (long double __value, int __ndigit,
910 int *__restrict __decpt, int *__restrict __sign,
911 char *__restrict __buf, size_t __len)
912 __THROW __nonnull ((3, 4, 5));
913extern int qfcvt_r (long double __value, int __ndigit,
914 int *__restrict __decpt, int *__restrict __sign,
915 char *__restrict __buf, size_t __len)
916 __THROW __nonnull ((3, 4, 5));
917#endif /* misc */
918
919
920/* Return the length of the multibyte character
921 in S, which is no longer than N. */
922extern int mblen (const char *__s, size_t __n) __THROW;
923/* Return the length of the given multibyte character,
924 putting its `wchar_t' representation in *PWC. */
925extern int mbtowc (wchar_t *__restrict __pwc,
926 const char *__restrict __s, size_t __n) __THROW;
927/* Put the multibyte character represented
928 by WCHAR in S, returning its length. */
929extern int wctomb (char *__s, wchar_t __wchar) __THROW;
930
931
932/* Convert a multibyte string to a wide char string. */
933extern size_t mbstowcs (wchar_t *__restrict __pwcs,
934 const char *__restrict __s, size_t __n) __THROW;
935/* Convert a wide char string to multibyte string. */
936extern size_t wcstombs (char *__restrict __s,
937 const wchar_t *__restrict __pwcs, size_t __n)
938 __THROW;
939
940
941#ifdef __USE_MISC
942/* Determine whether the string value of RESPONSE matches the affirmation
943 or negative response expression as specified by the LC_MESSAGES category
944 in the program's current locale. Returns 1 if affirmative, 0 if
945 negative, and -1 if not matching. */
946extern int rpmatch (const char *__response) __THROW __nonnull ((1)) __wur;
947#endif
948
949
950#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
951/* Parse comma separated suboption from *OPTIONP and match against
952 strings in TOKENS. If found return index and set *VALUEP to
953 optional value introduced by an equal sign. If the suboption is
954 not part of TOKENS return in *VALUEP beginning of unknown
955 suboption. On exit *OPTIONP is set to the beginning of the next
956 token or at the terminating NUL character. */
957extern int getsubopt (char **__restrict __optionp,
958 char *const *__restrict __tokens,
959 char **__restrict __valuep)
960 __THROW __nonnull ((1, 2, 3)) __wur;
961#endif
962
963
964/* X/Open pseudo terminal handling. */
965
966#ifdef __USE_XOPEN2KXSI
967/* Return a master pseudo-terminal handle. */
968extern int posix_openpt (int __oflag) __wur;
969#endif
970
971#ifdef __USE_XOPEN_EXTENDED
972/* The next four functions all take a master pseudo-tty fd and
973 perform an operation on the associated slave: */
974
975/* Chown the slave to the calling user. */
976extern int grantpt (int __fd) __THROW;
977
978/* Release an internal lock so the slave can be opened.
979 Call after grantpt(). */
980extern int unlockpt (int __fd) __THROW;
981
982/* Return the pathname of the pseudo terminal slave associated with
983 the master FD is open on, or NULL on errors.
984 The returned storage is good until the next call to this function. */
985extern char *ptsname (int __fd) __THROW __wur;
986#endif
987
988#ifdef __USE_GNU
989/* Store at most BUFLEN characters of the pathname of the slave pseudo
990 terminal associated with the master FD is open on in BUF.
991 Return 0 on success, otherwise an error number. */
992extern int ptsname_r (int __fd, char *__buf, size_t __buflen)
993 __THROW __nonnull ((2));
994
995/* Open a master pseudo terminal and return its file descriptor. */
996extern int getpt (void);
997#endif
998
999#ifdef __USE_MISC
1000/* Put the 1 minute, 5 minute and 15 minute load averages into the first
1001 NELEM elements of LOADAVG. Return the number written (never more than
1002 three, but may be less than NELEM), or -1 if an error occurred. */
1003extern int getloadavg (double __loadavg[], int __nelem)
1004 __THROW __nonnull ((1));
1005#endif
1006
1007#if defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K
1008/* Return the index into the active-logins file (utmp) for
1009 the controlling terminal. */
1010extern int ttyslot (void) __THROW;
1011#endif
1012
1013#include <bits/stdlib-float.h>
1014
1015/* Define some macros helping to catch buffer overflows. */
1016#if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
1017# include <bits/stdlib.h>
1018#endif
1019#ifdef __LDBL_COMPAT
1020# include <bits/stdlib-ldbl.h>
1021#endif
1022
1023__END_DECLS
1024
1025#endif /* stdlib.h */
1026

source code of include/stdlib.h