1 /* Copyright (C) 1991-2021 Free Software Foundation, Inc.
2 Copyright The GNU Toolchain Authors.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 /*
20 * ISO C99 Standard: 7.20 General utilities <stdlib.h>
21 */
22
23 #ifndef _STDLIB_H
24
25 #define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
26 #include <bits/libc-header-start.h>
27
28 /* Get size_t, wchar_t and NULL from <stddef.h>. */
29 #define __need_size_t
30 #define __need_wchar_t
31 #define __need_NULL
32 #include <stddef.h>
33
34 __BEGIN_DECLS
35
36 #define _STDLIB_H 1
37
38 #if (defined __USE_XOPEN || defined __USE_XOPEN2K8) && !defined _SYS_WAIT_H
39 /* XPG requires a few symbols from <sys/wait.h> being defined. */
40 # include <bits/waitflags.h>
41 # include <bits/waitstatus.h>
42
43 /* Define the macros <sys/wait.h> also would define this way. */
44 # define WEXITSTATUS(status) __WEXITSTATUS (status)
45 # define WTERMSIG(status) __WTERMSIG (status)
46 # define WSTOPSIG(status) __WSTOPSIG (status)
47 # define WIFEXITED(status) __WIFEXITED (status)
48 # define WIFSIGNALED(status) __WIFSIGNALED (status)
49 # define WIFSTOPPED(status) __WIFSTOPPED (status)
50 # ifdef __WIFCONTINUED
51 # define WIFCONTINUED(status) __WIFCONTINUED (status)
52 # endif
53 #endif /* X/Open or XPG7 and <sys/wait.h> not included. */
54
55 /* _FloatN API tests for enablement. */
56 #include <bits/floatn.h>
57
58 /* Returned by `div'. */
59 typedef struct
60 {
61 int quot; /* Quotient. */
62 int rem; /* Remainder. */
63 } div_t;
64
65 /* Returned by `ldiv'. */
66 #ifndef __ldiv_t_defined
67 typedef struct
68 {
69 long int quot; /* Quotient. */
70 long int rem; /* Remainder. */
71 } ldiv_t;
72 # define __ldiv_t_defined 1
73 #endif
74
75 #if defined __USE_ISOC99 && !defined __lldiv_t_defined
76 /* Returned by `lldiv'. */
77 __extension__ typedef struct
78 {
79 long long int quot; /* Quotient. */
80 long long int rem; /* Remainder. */
81 } lldiv_t;
82 # define __lldiv_t_defined 1
83 #endif
84
85
86 /* The largest number rand will return (same as INT_MAX). */
87 #define RAND_MAX 2147483647
88
89
90 /* We define these the same for all machines.
91 Changes from this to the outside world should be done in `_exit'. */
92 #define EXIT_FAILURE 1 /* Failing exit status. */
93 #define EXIT_SUCCESS 0 /* Successful exit status. */
94
95
96 /* Maximum length of a multibyte character in the current locale. */
97 #define MB_CUR_MAX (__ctype_get_mb_cur_max ())
98 extern size_t __ctype_get_mb_cur_max (void) __THROW __wur;
99
100
101 /* Convert a string to a floating-point number. */
102 extern double atof (const char *__nptr)
103 __THROW __attribute_pure__ __nonnull ((1)) __wur;
104 /* Convert a string to an integer. */
105 extern int atoi (const char *__nptr)
106 __THROW __attribute_pure__ __nonnull ((1)) __wur;
107 /* Convert a string to a long integer. */
108 extern long int atol (const char *__nptr)
109 __THROW __attribute_pure__ __nonnull ((1)) __wur;
110
111 #ifdef __USE_ISOC99
112 /* Convert a string to a long long integer. */
113 __extension__ extern long long int atoll (const char *__nptr)
114 __THROW __attribute_pure__ __nonnull ((1)) __wur;
115 #endif
116
117 /* Convert a string to a floating-point number. */
118 extern double strtod (const char *__restrict __nptr,
119 char **__restrict __endptr)
120 __THROW __nonnull ((1));
121
122 #ifdef __USE_ISOC99
123 /* Likewise for `float' and `long double' sizes of floating-point numbers. */
124 extern float strtof (const char *__restrict __nptr,
125 char **__restrict __endptr) __THROW __nonnull ((1));
126
127 extern long double strtold (const char *__restrict __nptr,
128 char **__restrict __endptr)
129 __THROW __nonnull ((1));
130 #endif
131
132 /* Likewise for '_FloatN' and '_FloatNx'. */
133
134 #if __HAVE_FLOAT16 && __GLIBC_USE (IEC_60559_TYPES_EXT)
135 extern _Float16 strtof16 (const char *__restrict __nptr,
136 char **__restrict __endptr)
137 __THROW __nonnull ((1));
138 #endif
139
140 #if __HAVE_FLOAT32 && __GLIBC_USE (IEC_60559_TYPES_EXT)
141 extern _Float32 strtof32 (const char *__restrict __nptr,
142 char **__restrict __endptr)
143 __THROW __nonnull ((1));
144 #endif
145
146 #if __HAVE_FLOAT64 && __GLIBC_USE (IEC_60559_TYPES_EXT)
147 extern _Float64 strtof64 (const char *__restrict __nptr,
148 char **__restrict __endptr)
149 __THROW __nonnull ((1));
150 #endif
151
152 #if __HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)
153 extern _Float128 strtof128 (const char *__restrict __nptr,
154 char **__restrict __endptr)
155 __THROW __nonnull ((1));
156 #endif
157
158 #if __HAVE_FLOAT32X && __GLIBC_USE (IEC_60559_TYPES_EXT)
159 extern _Float32x strtof32x (const char *__restrict __nptr,
160 char **__restrict __endptr)
161 __THROW __nonnull ((1));
162 #endif
163
164 #if __HAVE_FLOAT64X && __GLIBC_USE (IEC_60559_TYPES_EXT)
165 extern _Float64x strtof64x (const char *__restrict __nptr,
166 char **__restrict __endptr)
167 __THROW __nonnull ((1));
168 #endif
169
170 #if __HAVE_FLOAT128X && __GLIBC_USE (IEC_60559_TYPES_EXT)
171 extern _Float128x strtof128x (const char *__restrict __nptr,
172 char **__restrict __endptr)
173 __THROW __nonnull ((1));
174 #endif
175
176 /* Convert a string to a long integer. */
177 extern long int strtol (const char *__restrict __nptr,
178 char **__restrict __endptr, int __base)
179 __THROW __nonnull ((1));
180 /* Convert a string to an unsigned long integer. */
181 extern unsigned long int strtoul (const char *__restrict __nptr,
182 char **__restrict __endptr, int __base)
183 __THROW __nonnull ((1));
184
185 #ifdef __USE_MISC
186 /* Convert a string to a quadword integer. */
187 __extension__
188 extern long long int strtoq (const char *__restrict __nptr,
189 char **__restrict __endptr, int __base)
190 __THROW __nonnull ((1));
191 /* Convert a string to an unsigned quadword integer. */
192 __extension__
193 extern unsigned long long int strtouq (const char *__restrict __nptr,
194 char **__restrict __endptr, int __base)
195 __THROW __nonnull ((1));
196 #endif /* Use misc. */
197
198 #ifdef __USE_ISOC99
199 /* Convert a string to a quadword integer. */
200 __extension__
201 extern long long int strtoll (const char *__restrict __nptr,
202 char **__restrict __endptr, int __base)
203 __THROW __nonnull ((1));
204 /* Convert a string to an unsigned quadword integer. */
205 __extension__
206 extern unsigned long long int strtoull (const char *__restrict __nptr,
207 char **__restrict __endptr, int __base)
208 __THROW __nonnull ((1));
209 #endif /* ISO C99 or use MISC. */
210
211 /* Convert a floating-point number to a string. */
212 #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
213 extern int strfromd (char *__dest, size_t __size, const char *__format,
214 double __f)
215 __THROW __nonnull ((3));
216
217 extern int strfromf (char *__dest, size_t __size, const char *__format,
218 float __f)
219 __THROW __nonnull ((3));
220
221 extern int strfroml (char *__dest, size_t __size, const char *__format,
222 long double __f)
223 __THROW __nonnull ((3));
224 #endif
225
226 #if __HAVE_FLOAT16 && __GLIBC_USE (IEC_60559_TYPES_EXT)
227 extern int strfromf16 (char *__dest, size_t __size, const char * __format,
228 _Float16 __f)
229 __THROW __nonnull ((3));
230 #endif
231
232 #if __HAVE_FLOAT32 && __GLIBC_USE (IEC_60559_TYPES_EXT)
233 extern int strfromf32 (char *__dest, size_t __size, const char * __format,
234 _Float32 __f)
235 __THROW __nonnull ((3));
236 #endif
237
238 #if __HAVE_FLOAT64 && __GLIBC_USE (IEC_60559_TYPES_EXT)
239 extern int strfromf64 (char *__dest, size_t __size, const char * __format,
240 _Float64 __f)
241 __THROW __nonnull ((3));
242 #endif
243
244 #if __HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)
245 extern int strfromf128 (char *__dest, size_t __size, const char * __format,
246 _Float128 __f)
247 __THROW __nonnull ((3));
248 #endif
249
250 #if __HAVE_FLOAT32X && __GLIBC_USE (IEC_60559_TYPES_EXT)
251 extern int strfromf32x (char *__dest, size_t __size, const char * __format,
252 _Float32x __f)
253 __THROW __nonnull ((3));
254 #endif
255
256 #if __HAVE_FLOAT64X && __GLIBC_USE (IEC_60559_TYPES_EXT)
257 extern int strfromf64x (char *__dest, size_t __size, const char * __format,
258 _Float64x __f)
259 __THROW __nonnull ((3));
260 #endif
261
262 #if __HAVE_FLOAT128X && __GLIBC_USE (IEC_60559_TYPES_EXT)
263 extern int strfromf128x (char *__dest, size_t __size, const char * __format,
264 _Float128x __f)
265 __THROW __nonnull ((3));
266 #endif
267
268
269 #ifdef __USE_GNU
270 /* Parallel versions of the functions above which take the locale to
271 use as an additional parameter. These are GNU extensions inspired
272 by the POSIX.1-2008 extended locale API. */
273 # include <bits/types/locale_t.h>
274
275 extern long int strtol_l (const char *__restrict __nptr,
276 char **__restrict __endptr, int __base,
277 locale_t __loc) __THROW __nonnull ((1, 4));
278
279 extern unsigned long int strtoul_l (const char *__restrict __nptr,
280 char **__restrict __endptr,
281 int __base, locale_t __loc)
282 __THROW __nonnull ((1, 4));
283
284 __extension__
285 extern long long int strtoll_l (const char *__restrict __nptr,
286 char **__restrict __endptr, int __base,
287 locale_t __loc)
288 __THROW __nonnull ((1, 4));
289
290 __extension__
291 extern unsigned long long int strtoull_l (const char *__restrict __nptr,
292 char **__restrict __endptr,
293 int __base, locale_t __loc)
294 __THROW __nonnull ((1, 4));
295
296 extern double strtod_l (const char *__restrict __nptr,
297 char **__restrict __endptr, locale_t __loc)
298 __THROW __nonnull ((1, 3));
299
300 extern float strtof_l (const char *__restrict __nptr,
301 char **__restrict __endptr, locale_t __loc)
302 __THROW __nonnull ((1, 3));
303
304 extern long double strtold_l (const char *__restrict __nptr,
305 char **__restrict __endptr,
306 locale_t __loc)
307 __THROW __nonnull ((1, 3));
308
309 # if __HAVE_FLOAT16
310 extern _Float16 strtof16_l (const char *__restrict __nptr,
311 char **__restrict __endptr,
312 locale_t __loc)
313 __THROW __nonnull ((1, 3));
314 # endif
315
316 # if __HAVE_FLOAT32
317 extern _Float32 strtof32_l (const char *__restrict __nptr,
318 char **__restrict __endptr,
319 locale_t __loc)
320 __THROW __nonnull ((1, 3));
321 # endif
322
323 # if __HAVE_FLOAT64
324 extern _Float64 strtof64_l (const char *__restrict __nptr,
325 char **__restrict __endptr,
326 locale_t __loc)
327 __THROW __nonnull ((1, 3));
328 # endif
329
330 # if __HAVE_FLOAT128
331 extern _Float128 strtof128_l (const char *__restrict __nptr,
332 char **__restrict __endptr,
333 locale_t __loc)
334 __THROW __nonnull ((1, 3));
335 # endif
336
337 # if __HAVE_FLOAT32X
338 extern _Float32x strtof32x_l (const char *__restrict __nptr,
339 char **__restrict __endptr,
340 locale_t __loc)
341 __THROW __nonnull ((1, 3));
342 # endif
343
344 # if __HAVE_FLOAT64X
345 extern _Float64x strtof64x_l (const char *__restrict __nptr,
346 char **__restrict __endptr,
347 locale_t __loc)
348 __THROW __nonnull ((1, 3));
349 # endif
350
351 # if __HAVE_FLOAT128X
352 extern _Float128x strtof128x_l (const char *__restrict __nptr,
353 char **__restrict __endptr,
354 locale_t __loc)
355 __THROW __nonnull ((1, 3));
356 # endif
357 #endif /* GNU */
358
359
360 #ifdef __USE_EXTERN_INLINES
361 __extern_inline int
__NTH(atoi (const char * __nptr))362 __NTH (atoi (const char *__nptr))
363 {
364 return (int) strtol (__nptr, (char **) NULL, 10);
365 }
366 __extern_inline long int
__NTH(atol (const char * __nptr))367 __NTH (atol (const char *__nptr))
368 {
369 return strtol (__nptr, (char **) NULL, 10);
370 }
371
372 # ifdef __USE_ISOC99
373 __extension__ __extern_inline long long int
__NTH(atoll (const char * __nptr))374 __NTH (atoll (const char *__nptr))
375 {
376 return strtoll (__nptr, (char **) NULL, 10);
377 }
378 # endif
379 #endif /* Optimizing and Inlining. */
380
381
382 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
383 /* Convert N to base 64 using the digits "./0-9A-Za-z", least-significant
384 digit first. Returns a pointer to static storage overwritten by the
385 next call. */
386 extern char *l64a (long int __n) __THROW __wur;
387
388 /* Read a number from a string S in base 64 as above. */
389 extern long int a64l (const char *__s)
390 __THROW __attribute_pure__ __nonnull ((1)) __wur;
391
392 #endif /* Use misc || extended X/Open. */
393
394 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
395 # include <sys/types.h> /* we need int32_t... */
396
397 /* These are the functions that actually do things. The `random', `srandom',
398 `initstate' and `setstate' functions are those from BSD Unices.
399 The `rand' and `srand' functions are required by the ANSI standard.
400 We provide both interfaces to the same random number generator. */
401 /* Return a random long integer between 0 and 2^31-1 inclusive. */
402 extern long int random (void) __THROW;
403
404 /* Seed the random number generator with the given number. */
405 extern void srandom (unsigned int __seed) __THROW;
406
407 /* Initialize the random number generator to use state buffer STATEBUF,
408 of length STATELEN, and seed it with SEED. Optimal lengths are 8, 16,
409 32, 64, 128 and 256, the bigger the better; values less than 8 will
410 cause an error and values greater than 256 will be rounded down. */
411 extern char *initstate (unsigned int __seed, char *__statebuf,
412 size_t __statelen) __THROW __nonnull ((2));
413
414 /* Switch the random number generator to state buffer STATEBUF,
415 which should have been previously initialized by `initstate'. */
416 extern char *setstate (char *__statebuf) __THROW __nonnull ((1));
417
418
419 # ifdef __USE_MISC
420 /* Reentrant versions of the `random' family of functions.
421 These functions all use the following data structure to contain
422 state, rather than global state variables. */
423
424 struct random_data
425 {
426 int32_t *fptr; /* Front pointer. */
427 int32_t *rptr; /* Rear pointer. */
428 int32_t *state; /* Array of state values. */
429 int rand_type; /* Type of random number generator. */
430 int rand_deg; /* Degree of random number generator. */
431 int rand_sep; /* Distance between front and rear. */
432 int32_t *end_ptr; /* Pointer behind state table. */
433 };
434
435 extern int random_r (struct random_data *__restrict __buf,
436 int32_t *__restrict __result) __THROW __nonnull ((1, 2));
437
438 extern int srandom_r (unsigned int __seed, struct random_data *__buf)
439 __THROW __nonnull ((2));
440
441 extern int initstate_r (unsigned int __seed, char *__restrict __statebuf,
442 size_t __statelen,
443 struct random_data *__restrict __buf)
444 __THROW __nonnull ((2, 4));
445
446 extern int setstate_r (char *__restrict __statebuf,
447 struct random_data *__restrict __buf)
448 __THROW __nonnull ((1, 2));
449 # endif /* Use misc. */
450 #endif /* Use extended X/Open || misc. */
451
452
453 /* Return a random integer between 0 and RAND_MAX inclusive. */
454 extern int rand (void) __THROW;
455 /* Seed the random number generator with the given number. */
456 extern void srand (unsigned int __seed) __THROW;
457
458 #ifdef __USE_POSIX199506
459 /* Reentrant interface according to POSIX.1. */
460 extern int rand_r (unsigned int *__seed) __THROW;
461 #endif
462
463
464 #if defined __USE_MISC || defined __USE_XOPEN
465 /* System V style 48-bit random number generator functions. */
466
467 /* Return non-negative, double-precision floating-point value in [0.0,1.0). */
468 extern double drand48 (void) __THROW;
469 extern double erand48 (unsigned short int __xsubi[3]) __THROW __nonnull ((1));
470
471 /* Return non-negative, long integer in [0,2^31). */
472 extern long int lrand48 (void) __THROW;
473 extern long int nrand48 (unsigned short int __xsubi[3])
474 __THROW __nonnull ((1));
475
476 /* Return signed, long integers in [-2^31,2^31). */
477 extern long int mrand48 (void) __THROW;
478 extern long int jrand48 (unsigned short int __xsubi[3])
479 __THROW __nonnull ((1));
480
481 /* Seed random number generator. */
482 extern void srand48 (long int __seedval) __THROW;
483 extern unsigned short int *seed48 (unsigned short int __seed16v[3])
484 __THROW __nonnull ((1));
485 extern void lcong48 (unsigned short int __param[7]) __THROW __nonnull ((1));
486
487 # ifdef __USE_MISC
488 /* Data structure for communication with thread safe versions. This
489 type is to be regarded as opaque. It's only exported because users
490 have to allocate objects of this type. */
491 struct drand48_data
492 {
493 unsigned short int __x[3]; /* Current state. */
494 unsigned short int __old_x[3]; /* Old state. */
495 unsigned short int __c; /* Additive const. in congruential formula. */
496 unsigned short int __init; /* Flag for initializing. */
497 __extension__ unsigned long long int __a; /* Factor in congruential
498 formula. */
499 };
500
501 /* Return non-negative, double-precision floating-point value in [0.0,1.0). */
502 extern int drand48_r (struct drand48_data *__restrict __buffer,
503 double *__restrict __result) __THROW __nonnull ((1, 2));
504 extern int erand48_r (unsigned short int __xsubi[3],
505 struct drand48_data *__restrict __buffer,
506 double *__restrict __result) __THROW __nonnull ((1, 2));
507
508 /* Return non-negative, long integer in [0,2^31). */
509 extern int lrand48_r (struct drand48_data *__restrict __buffer,
510 long int *__restrict __result)
511 __THROW __nonnull ((1, 2));
512 extern int nrand48_r (unsigned short int __xsubi[3],
513 struct drand48_data *__restrict __buffer,
514 long int *__restrict __result)
515 __THROW __nonnull ((1, 2));
516
517 /* Return signed, long integers in [-2^31,2^31). */
518 extern int mrand48_r (struct drand48_data *__restrict __buffer,
519 long int *__restrict __result)
520 __THROW __nonnull ((1, 2));
521 extern int jrand48_r (unsigned short int __xsubi[3],
522 struct drand48_data *__restrict __buffer,
523 long int *__restrict __result)
524 __THROW __nonnull ((1, 2));
525
526 /* Seed random number generator. */
527 extern int srand48_r (long int __seedval, struct drand48_data *__buffer)
528 __THROW __nonnull ((2));
529
530 extern int seed48_r (unsigned short int __seed16v[3],
531 struct drand48_data *__buffer) __THROW __nonnull ((1, 2));
532
533 extern int lcong48_r (unsigned short int __param[7],
534 struct drand48_data *__buffer)
535 __THROW __nonnull ((1, 2));
536 # endif /* Use misc. */
537 #endif /* Use misc or X/Open. */
538
539 /* Allocate SIZE bytes of memory. */
540 extern void *malloc (size_t __size) __THROW __attribute_malloc__
541 __attribute_alloc_size__ ((1)) __wur;
542 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0. */
543 extern void *calloc (size_t __nmemb, size_t __size)
544 __THROW __attribute_malloc__ __attribute_alloc_size__ ((1, 2)) __wur;
545
546 /* Re-allocate the previously allocated block
547 in PTR, making the new block SIZE bytes long. */
548 /* __attribute_malloc__ is not used, because if realloc returns
549 the same pointer that was passed to it, aliasing needs to be allowed
550 between objects pointed by the old and new pointers. */
551 extern void *realloc (void *__ptr, size_t __size)
552 __THROW __attribute_warn_unused_result__ __attribute_alloc_size__ ((2));
553
554 /* Free a block allocated by `malloc', `realloc' or `calloc'. */
555 extern void free (void *__ptr) __THROW;
556
557 #ifdef __USE_MISC
558 /* Re-allocate the previously allocated block in PTR, making the new
559 block large enough for NMEMB elements of SIZE bytes each. */
560 /* __attribute_malloc__ is not used, because if reallocarray returns
561 the same pointer that was passed to it, aliasing needs to be allowed
562 between objects pointed by the old and new pointers. */
563 extern void *reallocarray (void *__ptr, size_t __nmemb, size_t __size)
564 __THROW __attribute_warn_unused_result__
565 __attribute_alloc_size__ ((2, 3))
566 __attr_dealloc_free;
567
568 /* Add reallocarray as its own deallocator. */
569 extern void *reallocarray (void *__ptr, size_t __nmemb, size_t __size)
570 __THROW __attr_dealloc (reallocarray, 1);
571 #endif
572
573 #ifdef __USE_MISC
574 # include <alloca.h>
575 #endif /* Use misc. */
576
577 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K) \
578 || defined __USE_MISC
579 /* Allocate SIZE bytes on a page boundary. The storage cannot be freed. */
580 extern void *valloc (size_t __size) __THROW __attribute_malloc__
581 __attribute_alloc_size__ ((1)) __wur;
582 #endif
583
584 #ifdef __USE_XOPEN2K
585 /* Allocate memory of SIZE bytes with an alignment of ALIGNMENT. */
586 extern int posix_memalign (void **__memptr, size_t __alignment, size_t __size)
587 __THROW __nonnull ((1)) __wur;
588 #endif
589
590 #ifdef __USE_ISOC11
591 /* ISO C variant of aligned allocation. */
592 extern void *aligned_alloc (size_t __alignment, size_t __size)
593 __THROW __attribute_malloc__ __attribute_alloc_align__ ((1))
594 __attribute_alloc_size__ ((2)) __wur;
595 #endif
596
597 /* Abort execution and generate a core-dump. */
598 extern void abort (void) __THROW __attribute__ ((__noreturn__));
599
600
601 /* Register a function to be called when `exit' is called. */
602 extern int atexit (void (*__func) (void)) __THROW __nonnull ((1));
603
604 #if defined __USE_ISOC11 || defined __USE_ISOCXX11
605 /* Register a function to be called when `quick_exit' is called. */
606 # ifdef __cplusplus
607 extern "C++" int at_quick_exit (void (*__func) (void))
608 __THROW __asm ("at_quick_exit") __nonnull ((1));
609 # else
610 extern int at_quick_exit (void (*__func) (void)) __THROW __nonnull ((1));
611 # endif
612 #endif
613
614 #ifdef __USE_MISC
615 /* Register a function to be called with the status
616 given to `exit' and the given argument. */
617 extern int on_exit (void (*__func) (int __status, void *__arg), void *__arg)
618 __THROW __nonnull ((1));
619 #endif
620
621 /* Call all functions registered with `atexit' and `on_exit',
622 in the reverse of the order in which they were registered,
623 perform stdio cleanup, and terminate program execution with STATUS. */
624 extern void exit (int __status) __THROW __attribute__ ((__noreturn__));
625
626 #if defined __USE_ISOC11 || defined __USE_ISOCXX11
627 /* Call all functions registered with `at_quick_exit' in the reverse
628 of the order in which they were registered and terminate program
629 execution with STATUS. */
630 extern void quick_exit (int __status) __THROW __attribute__ ((__noreturn__));
631 #endif
632
633 #ifdef __USE_ISOC99
634 /* Terminate the program with STATUS without calling any of the
635 functions registered with `atexit' or `on_exit'. */
636 extern void _Exit (int __status) __THROW __attribute__ ((__noreturn__));
637 #endif
638
639
640 /* Return the value of envariable NAME, or NULL if it doesn't exist. */
641 extern char *getenv (const char *__name) __THROW __nonnull ((1)) __wur;
642
643 #ifdef __USE_GNU
644 /* This function is similar to the above but returns NULL if the
645 programs is running with SUID or SGID enabled. */
646 extern char *secure_getenv (const char *__name)
647 __THROW __nonnull ((1)) __wur;
648 #endif
649
650 #if defined __USE_MISC || defined __USE_XOPEN
651 /* The SVID says this is in <stdio.h>, but this seems a better place. */
652 /* Put STRING, which is of the form "NAME=VALUE", in the environment.
653 If there is no `=', remove NAME from the environment. */
654 extern int putenv (char *__string) __THROW __nonnull ((1));
655 #endif
656
657 #ifdef __USE_XOPEN2K
658 /* Set NAME to VALUE in the environment.
659 If REPLACE is nonzero, overwrite an existing value. */
660 extern int setenv (const char *__name, const char *__value, int __replace)
661 __THROW __nonnull ((2));
662
663 /* Remove the variable NAME from the environment. */
664 extern int unsetenv (const char *__name) __THROW __nonnull ((1));
665 #endif
666
667 #ifdef __USE_MISC
668 /* The `clearenv' was planned to be added to POSIX.1 but probably
669 never made it. Nevertheless the POSIX.9 standard (POSIX bindings
670 for Fortran 77) requires this function. */
671 extern int clearenv (void) __THROW;
672 #endif
673
674
675 #if defined __USE_MISC \
676 || (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8)
677 /* Generate a unique temporary file name from TEMPLATE.
678 The last six characters of TEMPLATE must be "XXXXXX";
679 they are replaced with a string that makes the file name unique.
680 Always returns TEMPLATE, it's either a temporary file name or a null
681 string if it cannot get a unique file name. */
682 extern char *mktemp (char *__template) __THROW __nonnull ((1));
683 #endif
684
685 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
686 /* Generate a unique temporary file name from TEMPLATE.
687 The last six characters of TEMPLATE must be "XXXXXX";
688 they are replaced with a string that makes the filename unique.
689 Returns a file descriptor open on the file for reading and writing,
690 or -1 if it cannot create a uniquely-named file.
691
692 This function is a possible cancellation point and therefore not
693 marked with __THROW. */
694 # ifndef __USE_FILE_OFFSET64
695 extern int mkstemp (char *__template) __nonnull ((1)) __wur;
696 # else
697 # ifdef __REDIRECT
698 extern int __REDIRECT (mkstemp, (char *__template), mkstemp64)
699 __nonnull ((1)) __wur;
700 # else
701 # define mkstemp mkstemp64
702 # endif
703 # endif
704 # ifdef __USE_LARGEFILE64
705 extern int mkstemp64 (char *__template) __nonnull ((1)) __wur;
706 # endif
707 #endif
708
709 #ifdef __USE_MISC
710 /* Similar to mkstemp, but the template can have a suffix after the
711 XXXXXX. The length of the suffix is specified in the second
712 parameter.
713
714 This function is a possible cancellation point and therefore not
715 marked with __THROW. */
716 # ifndef __USE_FILE_OFFSET64
717 extern int mkstemps (char *__template, int __suffixlen) __nonnull ((1)) __wur;
718 # else
719 # ifdef __REDIRECT
720 extern int __REDIRECT (mkstemps, (char *__template, int __suffixlen),
721 mkstemps64) __nonnull ((1)) __wur;
722 # else
723 # define mkstemps mkstemps64
724 # endif
725 # endif
726 # ifdef __USE_LARGEFILE64
727 extern int mkstemps64 (char *__template, int __suffixlen)
728 __nonnull ((1)) __wur;
729 # endif
730 #endif
731
732 #ifdef __USE_XOPEN2K8
733 /* Create a unique temporary directory from TEMPLATE.
734 The last six characters of TEMPLATE must be "XXXXXX";
735 they are replaced with a string that makes the directory name unique.
736 Returns TEMPLATE, or a null pointer if it cannot get a unique name.
737 The directory is created mode 700. */
738 extern char *mkdtemp (char *__template) __THROW __nonnull ((1)) __wur;
739 #endif
740
741 #ifdef __USE_GNU
742 /* Generate a unique temporary file name from TEMPLATE similar to
743 mkstemp. But allow the caller to pass additional flags which are
744 used in the open call to create the file..
745
746 This function is a possible cancellation point and therefore not
747 marked with __THROW. */
748 # ifndef __USE_FILE_OFFSET64
749 extern int mkostemp (char *__template, int __flags) __nonnull ((1)) __wur;
750 # else
751 # ifdef __REDIRECT
752 extern int __REDIRECT (mkostemp, (char *__template, int __flags), mkostemp64)
753 __nonnull ((1)) __wur;
754 # else
755 # define mkostemp mkostemp64
756 # endif
757 # endif
758 # ifdef __USE_LARGEFILE64
759 extern int mkostemp64 (char *__template, int __flags) __nonnull ((1)) __wur;
760 # endif
761
762 /* Similar to mkostemp, but the template can have a suffix after the
763 XXXXXX. The length of the suffix is specified in the second
764 parameter.
765
766 This function is a possible cancellation point and therefore not
767 marked with __THROW. */
768 # ifndef __USE_FILE_OFFSET64
769 extern int mkostemps (char *__template, int __suffixlen, int __flags)
770 __nonnull ((1)) __wur;
771 # else
772 # ifdef __REDIRECT
773 extern int __REDIRECT (mkostemps, (char *__template, int __suffixlen,
774 int __flags), mkostemps64)
775 __nonnull ((1)) __wur;
776 # else
777 # define mkostemps mkostemps64
778 # endif
779 # endif
780 # ifdef __USE_LARGEFILE64
781 extern int mkostemps64 (char *__template, int __suffixlen, int __flags)
782 __nonnull ((1)) __wur;
783 # endif
784 #endif
785
786
787 /* Execute the given line as a shell command.
788
789 This function is a cancellation point and therefore not marked with
790 __THROW. */
791 extern int system (const char *__command) __wur;
792
793
794 #ifdef __USE_GNU
795 /* Return a malloc'd string containing the canonical absolute name of the
796 existing named file. */
797 extern char *canonicalize_file_name (const char *__name)
798 __THROW __nonnull ((1)) __attribute_malloc__
799 __attr_dealloc_free __wur;
800 #endif
801
802 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
803 /* Return the canonical absolute name of file NAME. If RESOLVED is
804 null, the result is malloc'd; otherwise, if the canonical name is
805 PATH_MAX chars or more, returns null with `errno' set to
806 ENAMETOOLONG; if the name fits in fewer than PATH_MAX chars,
807 returns the name in RESOLVED. */
808 extern char *realpath (const char *__restrict __name,
809 char *__restrict __resolved) __THROW __wur;
810 #endif
811
812
813 /* Shorthand for type of comparison functions. */
814 #ifndef __COMPAR_FN_T
815 # define __COMPAR_FN_T
816 typedef int (*__compar_fn_t) (const void *, const void *);
817
818 # ifdef __USE_GNU
819 typedef __compar_fn_t comparison_fn_t;
820 # endif
821 #endif
822 #ifdef __USE_GNU
823 typedef int (*__compar_d_fn_t) (const void *, const void *, void *);
824 #endif
825
826 /* Do a binary search for KEY in BASE, which consists of NMEMB elements
827 of SIZE bytes each, using COMPAR to perform the comparisons. */
828 extern void *bsearch (const void *__key, const void *__base,
829 size_t __nmemb, size_t __size, __compar_fn_t __compar)
830 __nonnull ((1, 2, 5)) __wur;
831
832 #ifdef __USE_EXTERN_INLINES
833 # include <bits/stdlib-bsearch.h>
834 #endif
835
836 /* Sort NMEMB elements of BASE, of SIZE bytes each,
837 using COMPAR to perform the comparisons. */
838 extern void qsort (void *__base, size_t __nmemb, size_t __size,
839 __compar_fn_t __compar) __nonnull ((1, 4));
840 #ifdef __USE_GNU
841 extern void qsort_r (void *__base, size_t __nmemb, size_t __size,
842 __compar_d_fn_t __compar, void *__arg)
843 __nonnull ((1, 4));
844 #endif
845
846
847 /* Return the absolute value of X. */
848 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
849 extern long int labs (long int __x) __THROW __attribute__ ((__const__)) __wur;
850
851 #ifdef __USE_ISOC99
852 __extension__ extern long long int llabs (long long int __x)
853 __THROW __attribute__ ((__const__)) __wur;
854 #endif
855
856
857 /* Return the `div_t', `ldiv_t' or `lldiv_t' representation
858 of the value of NUMER over DENOM. */
859 /* GCC may have built-ins for these someday. */
860 extern div_t div (int __numer, int __denom)
861 __THROW __attribute__ ((__const__)) __wur;
862 extern ldiv_t ldiv (long int __numer, long int __denom)
863 __THROW __attribute__ ((__const__)) __wur;
864
865 #ifdef __USE_ISOC99
866 __extension__ extern lldiv_t lldiv (long long int __numer,
867 long long int __denom)
868 __THROW __attribute__ ((__const__)) __wur;
869 #endif
870
871
872 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \
873 || defined __USE_MISC
874 /* Convert floating point numbers to strings. The returned values are
875 valid only until another call to the same function. */
876
877 /* Convert VALUE to a string with NDIGIT digits and return a pointer to
878 this. Set *DECPT with the position of the decimal character and *SIGN
879 with the sign of the number. */
880 extern char *ecvt (double __value, int __ndigit, int *__restrict __decpt,
881 int *__restrict __sign) __THROW __nonnull ((3, 4)) __wur;
882
883 /* Convert VALUE to a string rounded to NDIGIT decimal digits. Set *DECPT
884 with the position of the decimal character and *SIGN with the sign of
885 the number. */
886 extern char *fcvt (double __value, int __ndigit, int *__restrict __decpt,
887 int *__restrict __sign) __THROW __nonnull ((3, 4)) __wur;
888
889 /* If possible convert VALUE to a string with NDIGIT significant digits.
890 Otherwise use exponential representation. The resulting string will
891 be written to BUF. */
892 extern char *gcvt (double __value, int __ndigit, char *__buf)
893 __THROW __nonnull ((3)) __wur;
894 #endif
895
896 #ifdef __USE_MISC
897 /* Long double versions of above functions. */
898 extern char *qecvt (long double __value, int __ndigit,
899 int *__restrict __decpt, int *__restrict __sign)
900 __THROW __nonnull ((3, 4)) __wur;
901 extern char *qfcvt (long double __value, int __ndigit,
902 int *__restrict __decpt, int *__restrict __sign)
903 __THROW __nonnull ((3, 4)) __wur;
904 extern char *qgcvt (long double __value, int __ndigit, char *__buf)
905 __THROW __nonnull ((3)) __wur;
906
907
908 /* Reentrant version of the functions above which provide their own
909 buffers. */
910 extern int ecvt_r (double __value, int __ndigit, int *__restrict __decpt,
911 int *__restrict __sign, char *__restrict __buf,
912 size_t __len) __THROW __nonnull ((3, 4, 5));
913 extern int fcvt_r (double __value, int __ndigit, int *__restrict __decpt,
914 int *__restrict __sign, char *__restrict __buf,
915 size_t __len) __THROW __nonnull ((3, 4, 5));
916
917 extern int qecvt_r (long double __value, int __ndigit,
918 int *__restrict __decpt, int *__restrict __sign,
919 char *__restrict __buf, size_t __len)
920 __THROW __nonnull ((3, 4, 5));
921 extern int qfcvt_r (long double __value, int __ndigit,
922 int *__restrict __decpt, int *__restrict __sign,
923 char *__restrict __buf, size_t __len)
924 __THROW __nonnull ((3, 4, 5));
925 #endif /* misc */
926
927
928 /* Return the length of the multibyte character
929 in S, which is no longer than N. */
930 extern int mblen (const char *__s, size_t __n) __THROW;
931 /* Return the length of the given multibyte character,
932 putting its `wchar_t' representation in *PWC. */
933 extern int mbtowc (wchar_t *__restrict __pwc,
934 const char *__restrict __s, size_t __n) __THROW;
935 /* Put the multibyte character represented
936 by WCHAR in S, returning its length. */
937 extern int wctomb (char *__s, wchar_t __wchar) __THROW;
938
939
940 /* Convert a multibyte string to a wide char string. */
941 extern size_t mbstowcs (wchar_t *__restrict __pwcs,
942 const char *__restrict __s, size_t __n) __THROW
943 __attr_access ((__read_only__, 2));
944 /* Convert a wide char string to multibyte string. */
945 extern size_t wcstombs (char *__restrict __s,
946 const wchar_t *__restrict __pwcs, size_t __n)
947 __THROW
948 __fortified_attr_access (__write_only__, 1, 3)
949 __attr_access ((__read_only__, 2));
950
951 #ifdef __USE_MISC
952 /* Determine whether the string value of RESPONSE matches the affirmation
953 or negative response expression as specified by the LC_MESSAGES category
954 in the program's current locale. Returns 1 if affirmative, 0 if
955 negative, and -1 if not matching. */
956 extern int rpmatch (const char *__response) __THROW __nonnull ((1)) __wur;
957 #endif
958
959
960 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
961 /* Parse comma separated suboption from *OPTIONP and match against
962 strings in TOKENS. If found return index and set *VALUEP to
963 optional value introduced by an equal sign. If the suboption is
964 not part of TOKENS return in *VALUEP beginning of unknown
965 suboption. On exit *OPTIONP is set to the beginning of the next
966 token or at the terminating NUL character. */
967 extern int getsubopt (char **__restrict __optionp,
968 char *const *__restrict __tokens,
969 char **__restrict __valuep)
970 __THROW __nonnull ((1, 2, 3)) __wur;
971 #endif
972
973
974 /* X/Open pseudo terminal handling. */
975
976 #ifdef __USE_XOPEN2KXSI
977 /* Return a master pseudo-terminal handle. */
978 extern int posix_openpt (int __oflag) __wur;
979 #endif
980
981 #ifdef __USE_XOPEN_EXTENDED
982 /* The next four functions all take a master pseudo-tty fd and
983 perform an operation on the associated slave: */
984
985 /* Chown the slave to the calling user. */
986 extern int grantpt (int __fd) __THROW;
987
988 /* Release an internal lock so the slave can be opened.
989 Call after grantpt(). */
990 extern int unlockpt (int __fd) __THROW;
991
992 /* Return the pathname of the pseudo terminal slave associated with
993 the master FD is open on, or NULL on errors.
994 The returned storage is good until the next call to this function. */
995 extern char *ptsname (int __fd) __THROW __wur;
996 #endif
997
998 #ifdef __USE_GNU
999 /* Store at most BUFLEN characters of the pathname of the slave pseudo
1000 terminal associated with the master FD is open on in BUF.
1001 Return 0 on success, otherwise an error number. */
1002 extern int ptsname_r (int __fd, char *__buf, size_t __buflen)
1003 __THROW __nonnull ((2)) __fortified_attr_access (__write_only__, 2, 3);
1004
1005 /* Open a master pseudo terminal and return its file descriptor. */
1006 extern int getpt (void);
1007 #endif
1008
1009 #ifdef __USE_MISC
1010 /* Put the 1 minute, 5 minute and 15 minute load averages into the first
1011 NELEM elements of LOADAVG. Return the number written (never more than
1012 three, but may be less than NELEM), or -1 if an error occurred. */
1013 extern int getloadavg (double __loadavg[], int __nelem)
1014 __THROW __nonnull ((1));
1015 #endif
1016
1017 #if defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K
1018 /* Return the index into the active-logins file (utmp) for
1019 the controlling terminal. */
1020 extern int ttyslot (void) __THROW;
1021 #endif
1022
1023 #include <bits/stdlib-float.h>
1024
1025 /* Define some macros helping to catch buffer overflows. */
1026 #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
1027 # include <bits/stdlib.h>
1028 #endif
1029
1030 #include <bits/floatn.h>
1031 #if defined __LDBL_COMPAT || __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
1032 # include <bits/stdlib-ldbl.h>
1033 #endif
1034
1035 __END_DECLS
1036
1037 #endif /* stdlib.h */
1038