include/stdlib.h

   1 /* Copyright (C) 1991-2007, 2009 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 /*
  20  *      ISO C99 Standard: 7.20 General utilities        <stdlib.h>
  21  */
  22
  23 #ifndef _STDLIB_H
  24
  25 #include <features.h>
  26
  27 /* Get size_t, wchar_t and NULL from <stddef.h>.  */
  28 #define         __need_size_t
  29 #ifndef __need_malloc_and_calloc
  30 # ifdef __UCLIBC_HAS_WCHAR__
  31 #  define       __need_wchar_t
  32 # endif
  33 # define        __need_NULL
  34 #endif
  35 #include <stddef.h>
  36
  37 __BEGIN_DECLS
  38
  39 #ifndef __need_malloc_and_calloc
  40 #define _STDLIB_H       1
  41
  42 #if defined __USE_XOPEN && !defined _SYS_WAIT_H
  43 /* XPG requires a few symbols from <sys/wait.h> being defined.  */
  44 # include <bits/waitflags.h>
  45 # include <bits/waitstatus.h>
  46
  47 # ifdef __USE_BSD
  48
  49 /* Lots of hair to allow traditional BSD use of `union wait'
  50    as well as POSIX.1 use of `int' for the status word.  */
  51
  52 #  if defined __GNUC__ && !defined __cplusplus
  53 #   define __WAIT_INT(status)                                                 \
  54   (__extension__ ({ union { __typeof(status) __in; int __i; } __u;            \
  55                     __u.__in = (status); __u.__i; }))
  56 #  else
  57 #   define __WAIT_INT(status)   (*(int *) &(status))
  58 #  endif
  59
  60 /* This is the type of the argument to `wait'.  The funky union
  61    causes redeclarations with either `int *' or `union wait *' to be
  62    allowed without complaint.  __WAIT_STATUS_DEFN is the type used in
  63    the actual function definitions.  */
  64
  65 #  if !defined __GNUC__ || __GNUC__ < 2 || defined __cplusplus
  66 #   define __WAIT_STATUS        void *
  67 #   define __WAIT_STATUS_DEFN   void *
  68 #  else
  69 /* This works in GCC 2.6.1 and later.  */
  70 typedef union
  71   {
  72     union wait *__uptr;
  73     int *__iptr;
  74   } __WAIT_STATUS __attribute__ ((__transparent_union__));
  75 #   define __WAIT_STATUS_DEFN   int *
  76 #  endif
  77
  78 # else /* Don't use BSD.  */
  79
  80 #  define __WAIT_INT(status)    (status)
  81 #  define __WAIT_STATUS         int *
  82 #  define __WAIT_STATUS_DEFN    int *
  83
  84 # endif /* Use BSD.  */
  85
  86 /* Define the macros <sys/wait.h> also would define this way.  */
  87 # define WEXITSTATUS(status)    __WEXITSTATUS (__WAIT_INT (status))
  88 # define WTERMSIG(status)       __WTERMSIG (__WAIT_INT (status))
  89 # define WSTOPSIG(status)       __WSTOPSIG (__WAIT_INT (status))
  90 # define WIFEXITED(status)      __WIFEXITED (__WAIT_INT (status))
  91 # define WIFSIGNALED(status)    __WIFSIGNALED (__WAIT_INT (status))
  92 # define WIFSTOPPED(status)     __WIFSTOPPED (__WAIT_INT (status))
  93 # ifdef __WIFCONTINUED
  94 #  define WIFCONTINUED(status)  __WIFCONTINUED (__WAIT_INT (status))
  95 # endif
  96 #endif  /* X/Open and <sys/wait.h> not included.  */
  97
  98 __BEGIN_NAMESPACE_STD
  99 /* Returned by `div'.  */
 100 typedef struct
 101   {
 102     int quot;                   /* Quotient.  */
 103     int rem;                    /* Remainder.  */
 104   } div_t;
 105
 106 /* Returned by `ldiv'.  */
 107 #ifndef __ldiv_t_defined
 108 typedef struct
 109   {
 110     long int quot;              /* Quotient.  */
 111     long int rem;               /* Remainder.  */
 112   } ldiv_t;
 113 # define __ldiv_t_defined       1
 114 #endif
 115 __END_NAMESPACE_STD
 116
 117 #if defined __USE_ISOC99 && !defined __lldiv_t_defined
 118 __BEGIN_NAMESPACE_C99
 119 /* Returned by `lldiv'.  */
 120 __extension__ typedef struct
 121   {
 122     long long int quot;         /* Quotient.  */
 123     long long int rem;          /* Remainder.  */
 124   } lldiv_t;
 125 # define __lldiv_t_defined      1
 126 __END_NAMESPACE_C99
 127 #endif
 128
 129
 130 /* The largest number rand will return (same as INT_MAX).  */
 131 #define RAND_MAX        2147483647
 132
 133
 134 /* We define these the same for all machines.
 135    Changes from this to the outside world should be done in `_exit'.  */
 136 #define EXIT_FAILURE    1       /* Failing exit status.  */
 137 #define EXIT_SUCCESS    0       /* Successful exit status.  */
 138
 139
 140 /* Maximum length of a multibyte character in the current locale.  */
 141 #if 0
 142 #define MB_CUR_MAX      (__ctype_get_mb_cur_max ())
 143 extern size_t __ctype_get_mb_cur_max (void) __THROW __wur;
 144 #else
 145 #ifdef __UCLIBC_HAS_WCHAR__
 146 #define MB_CUR_MAX      (_stdlib_mb_cur_max ())
 147 extern size_t _stdlib_mb_cur_max (void) __THROW __wur;
 148 libc_hidden_proto(_stdlib_mb_cur_max)
 149 #endif
 150 #endif
 151
 152
 153 __BEGIN_NAMESPACE_STD
 154 #ifdef __UCLIBC_HAS_FLOATS__
 155 /* Convert a string to a floating-point number.  */
 156 extern double atof (__const char *__nptr)
 157      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 158 #endif /* __UCLIBC_HAS_FLOATS__ */
 159 /* Convert a string to an integer.  */
 160 extern int atoi (__const char *__nptr)
 161      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 162 libc_hidden_proto(atoi)
 163 /* Convert a string to a long integer.  */
 164 extern long int atol (__const char *__nptr)
 165      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 166 libc_hidden_proto(atol)
 167 __END_NAMESPACE_STD
 168
 169 #if defined __USE_ISOC99 || defined __USE_MISC
 170 __BEGIN_NAMESPACE_C99
 171 /* Convert a string to a long long integer.  */
 172 __extension__ extern long long int atoll (__const char *__nptr)
 173      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 174 __END_NAMESPACE_C99
 175 #endif
 176
 177 #ifdef __UCLIBC_HAS_FLOATS__
 178 __BEGIN_NAMESPACE_STD
 179 /* Convert a string to a floating-point number.  */
 180 extern double strtod (__const char *__restrict __nptr,
 181                       char **__restrict __endptr)
 182      __THROW __nonnull ((1)) __wur;
 183 libc_hidden_proto(strtod)
 184 __END_NAMESPACE_STD
 185
 186 #ifdef  __USE_ISOC99
 187 __BEGIN_NAMESPACE_C99
 188 /* Likewise for `float' and `long double' sizes of floating-point numbers.  */
 189 extern float strtof (__const char *__restrict __nptr,
 190                      char **__restrict __endptr) __THROW __nonnull ((1)) __wur;
 191
 192 extern long double strtold (__const char *__restrict __nptr,
 193                             char **__restrict __endptr)
 194      __THROW __nonnull ((1)) __wur;
 195 __END_NAMESPACE_C99
 196 #endif
 197 #endif /* __UCLIBC_HAS_FLOATS__ */
 198
 199 __BEGIN_NAMESPACE_STD
 200 /* Convert a string to a long integer.  */
 201 extern long int strtol (__const char *__restrict __nptr,
 202                         char **__restrict __endptr, int __base)
 203      __THROW __nonnull ((1)) __wur;
 204 libc_hidden_proto(strtol)
 205 /* Convert a string to an unsigned long integer.  */
 206 extern unsigned long int strtoul (__const char *__restrict __nptr,
 207                                   char **__restrict __endptr, int __base)
 208      __THROW __nonnull ((1)) __wur;
 209 libc_hidden_proto(strtoul)
 210 __END_NAMESPACE_STD
 211
 212 #ifdef __USE_BSD
 213 #include <sys/types.h> /* for u_quad_t */
 214
 215 /* Convert a string to a quadword integer.  */
 216 __extension__
 217 extern long long int strtoq (__const char *__restrict __nptr,
 218                              char **__restrict __endptr, int __base)
 219      __THROW __nonnull ((1)) __wur;
 220 /* Convert a string to an unsigned quadword integer.  */
 221 __extension__
 222 extern u_quad_t strtouq (__const char *__restrict __nptr,
 223                                        char **__restrict __endptr, int __base)
 224      __THROW __nonnull ((1)) __wur;
 225 #endif /* GCC and use BSD.  */
 226
 227 #if defined __USE_ISOC99 || defined __USE_MISC
 228 __BEGIN_NAMESPACE_C99
 229 /* Convert a string to a quadword integer.  */
 230 __extension__
 231 extern long long int strtoll (__const char *__restrict __nptr,
 232                               char **__restrict __endptr, int __base)
 233      __THROW __nonnull ((1)) __wur;
 234 libc_hidden_proto(strtoll)
 235 /* Convert a string to an unsigned quadword integer.  */
 236 __extension__
 237 extern unsigned long long int strtoull (__const char *__restrict __nptr,
 238                                         char **__restrict __endptr, int __base)
 239      __THROW __nonnull ((1)) __wur;
 240 __END_NAMESPACE_C99
 241 #endif /* ISO C99 or GCC and use MISC.  */
 242
 243
 244 #if defined __USE_GNU && defined __UCLIBC_HAS_XLOCALE__
 245 /* The concept of one static locale per category is not very well
 246    thought out.  Many applications will need to process its data using
 247    information from several different locales.  Another application is
 248    the implementation of the internationalization handling in the
 249    upcoming ISO C++ standard library.  To support this another set of
 250    the functions using locale data exist which have an additional
 251    argument.
 252
 253    Attention: all these functions are *not* standardized in any form.
 254    This is a proof-of-concept implementation.  */
 255
 256 /* Structure for reentrant locale using functions.  This is an
 257    (almost) opaque type for the user level programs.  */
 258 # include <xlocale.h>
 259
 260 /* Special versions of the functions above which take the locale to
 261    use as an additional parameter.  */
 262 extern long int strtol_l (__const char *__restrict __nptr,
 263                           char **__restrict __endptr, int __base,
 264                           __locale_t __loc) __THROW __nonnull ((1, 4)) __wur;
 265 libc_hidden_proto(strtol_l)
 266
 267 extern unsigned long int strtoul_l (__const char *__restrict __nptr,
 268                                     char **__restrict __endptr,
 269                                     int __base, __locale_t __loc)
 270      __THROW __nonnull ((1, 4)) __wur;
 271 libc_hidden_proto(strtoul_l)
 272
 273 __extension__
 274 extern long long int strtoll_l (__const char *__restrict __nptr,
 275                                 char **__restrict __endptr, int __base,
 276                                 __locale_t __loc)
 277      __THROW __nonnull ((1, 4)) __wur;
 278
 279 __extension__
 280 extern unsigned long long int strtoull_l (__const char *__restrict __nptr,
 281                                           char **__restrict __endptr,
 282                                           int __base, __locale_t __loc)
 283      __THROW __nonnull ((1, 4)) __wur;
 284
 285 #ifdef __UCLIBC_HAS_FLOATS__
 286 extern double strtod_l (__const char *__restrict __nptr,
 287                         char **__restrict __endptr, __locale_t __loc)
 288      __THROW __nonnull ((1, 3)) __wur;
 289
 290 extern float strtof_l (__const char *__restrict __nptr,
 291                        char **__restrict __endptr, __locale_t __loc)
 292      __THROW __nonnull ((1, 3)) __wur;
 293
 294 extern long double strtold_l (__const char *__restrict __nptr,
 295                               char **__restrict __endptr,
 296                               __locale_t __loc)
 297      __THROW __nonnull ((1, 3)) __wur;
 298 #endif /* __UCLIBC_HAS_FLOATS__ */
 299 #endif /* GNU */
 300
 301
 302 #if defined __USE_SVID || defined __USE_XOPEN_EXTENDED
 303 /* Convert N to base 64 using the digits "./0-9A-Za-z", least-significant
 304    digit first.  Returns a pointer to static storage overwritten by the
 305    next call.  */
 306 extern char *l64a (long int __n) __THROW __wur;
 307
 308 /* Read a number from a string S in base 64 as above.  */
 309 extern long int a64l (__const char *__s)
 310      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 311
 312 #endif  /* Use SVID || extended X/Open.  */
 313
 314 #if defined __USE_SVID || defined __USE_XOPEN_EXTENDED || defined __USE_BSD
 315 # include <sys/types.h> /* we need int32_t... */
 316
 317 /* These are the functions that actually do things.  The `random', `srandom',
 318    `initstate' and `setstate' functions are those from BSD Unices.
 319    The `rand' and `srand' functions are required by the ANSI standard.
 320    We provide both interfaces to the same random number generator.  */
 321 /* Return a random long integer between 0 and RAND_MAX inclusive.  */
 322 extern long int random (void) __THROW;
 323 libc_hidden_proto(random)
 324
 325 /* Seed the random number generator with the given number.  */
 326 extern void srandom (unsigned int __seed) __THROW;
 327
 328 /* Initialize the random number generator to use state buffer STATEBUF,
 329    of length STATELEN, and seed it with SEED.  Optimal lengths are 8, 16,
 330    32, 64, 128 and 256, the bigger the better; values less than 8 will
 331    cause an error and values greater than 256 will be rounded down.  */
 332 extern char *initstate (unsigned int __seed, char *__statebuf,
 333                         size_t __statelen) __THROW __nonnull ((2));
 334
 335 /* Switch the random number generator to state buffer STATEBUF,
 336    which should have been previously initialized by `initstate'.  */
 337 extern char *setstate (char *__statebuf) __THROW __nonnull ((1));
 338
 339
 340 # ifdef __USE_MISC
 341 /* Reentrant versions of the `random' family of functions.
 342    These functions all use the following data structure to contain
 343    state, rather than global state variables.  */
 344
 345 struct random_data
 346   {
 347     int32_t *fptr;              /* Front pointer.  */
 348     int32_t *rptr;              /* Rear pointer.  */
 349     int32_t *state;             /* Array of state values.  */
 350     /* random_r.c, TYPE_x, DEG_x, SEP_x - small enough for int8_t */
 351     int8_t rand_type;           /* Type of random number generator.  */
 352     int8_t rand_deg;            /* Degree of random number generator.  */
 353     int8_t rand_sep;            /* Distance between front and rear.  */
 354     int32_t *end_ptr;           /* Pointer behind state table.  */
 355   };
 356
 357 extern int random_r (struct random_data *__restrict __buf,
 358                      int32_t *__restrict __result) __THROW __nonnull ((1, 2));
 359 libc_hidden_proto(random_r)
 360
 361 extern int srandom_r (unsigned int __seed, struct random_data *__buf)
 362      __THROW __nonnull ((2));
 363 libc_hidden_proto(srandom_r)
 364
 365 extern int initstate_r (unsigned int __seed, char *__restrict __statebuf,
 366                         size_t __statelen,
 367                         struct random_data *__restrict __buf)
 368      __THROW __nonnull ((2, 4));
 369 libc_hidden_proto(initstate_r)
 370
 371 extern int setstate_r (char *__restrict __statebuf,
 372                        struct random_data *__restrict __buf)
 373      __THROW __nonnull ((1, 2));
 374 libc_hidden_proto(setstate_r)
 375 # endif /* Use misc.  */
 376 #endif  /* Use SVID || extended X/Open || BSD. */
 377
 378
 379 __BEGIN_NAMESPACE_STD
 380 /* Return a random integer between 0 and RAND_MAX inclusive.  */
 381 extern int rand (void) __THROW;
 382 /* Seed the random number generator with the given number.  */
 383 extern void srand (unsigned int __seed) __THROW;
 384 __END_NAMESPACE_STD
 385
 386 #ifdef __USE_POSIX
 387 /* Reentrant interface according to POSIX.1.  */
 388 extern int rand_r (unsigned int *__seed) __THROW;
 389 #endif
 390
 391
 392 #if defined __USE_SVID || defined __USE_XOPEN
 393 /* System V style 48-bit random number generator functions.  */
 394
 395 #ifdef __UCLIBC_HAS_FLOATS__
 396 /* Return non-negative, double-precision floating-point value in [0.0,1.0).  */
 397 extern double drand48 (void) __THROW;
 398 extern double erand48 (unsigned short int __xsubi[3]) __THROW __nonnull ((1));
 399 #endif /* __UCLIBC_HAS_FLOATS__ */
 400
 401 /* Return non-negative, long integer in [0,2^31).  */
 402 extern long int lrand48 (void) __THROW;
 403 extern long int nrand48 (unsigned short int __xsubi[3])
 404      __THROW __nonnull ((1));
 405
 406 /* Return signed, long integers in [-2^31,2^31).  */
 407 extern long int mrand48 (void) __THROW;
 408 extern long int jrand48 (unsigned short int __xsubi[3])
 409      __THROW __nonnull ((1));
 410
 411 /* Seed random number generator.  */
 412 extern void srand48 (long int __seedval) __THROW;
 413 extern unsigned short int *seed48 (unsigned short int __seed16v[3])
 414      __THROW __nonnull ((1));
 415 extern void lcong48 (unsigned short int __param[7]) __THROW __nonnull ((1));
 416
 417 # ifdef __USE_MISC
 418 /* Data structure for communication with thread safe versions.  This
 419    type is to be regarded as opaque.  It's only exported because users
 420    have to allocate objects of this type.  */
 421 struct drand48_data
 422   {
 423     unsigned short int __x[3];  /* Current state.  */
 424     unsigned short int __old_x[3]; /* Old state.  */
 425     unsigned short int __c;     /* Additive const. in congruential formula.  */
 426     unsigned short int __init;  /* Flag for initializing.  */
 427     unsigned long long int __a; /* Factor in congruential formula.  */
 428   };
 429
 430 #ifdef __UCLIBC_HAS_FLOATS__
 431 /* Return non-negative, double-precision floating-point value in [0.0,1.0).  */
 432 extern int drand48_r (struct drand48_data *__restrict __buffer,
 433                       double *__restrict __result) __THROW __nonnull ((1, 2));
 434 extern int erand48_r (unsigned short int __xsubi[3],
 435                       struct drand48_data *__restrict __buffer,
 436                       double *__restrict __result) __THROW __nonnull ((1, 2));
 437 libc_hidden_proto(erand48_r)
 438 #endif /* __UCLIBC_HAS_FLOATS__ */
 439
 440 /* Return non-negative, long integer in [0,2^31).  */
 441 extern int lrand48_r (struct drand48_data *__restrict __buffer,
 442                       long int *__restrict __result)
 443      __THROW __nonnull ((1, 2));
 444 libc_hidden_proto(lrand48_r)
 445 extern int nrand48_r (unsigned short int __xsubi[3],
 446                       struct drand48_data *__restrict __buffer,
 447                       long int *__restrict __result)
 448      __THROW __nonnull ((1, 2));
 449 libc_hidden_proto(nrand48_r)
 450
 451 /* Return signed, long integers in [-2^31,2^31).  */
 452 extern int mrand48_r (struct drand48_data *__restrict __buffer,
 453                       long int *__restrict __result)
 454      __THROW __nonnull ((1, 2));
 455 extern int jrand48_r (unsigned short int __xsubi[3],
 456                       struct drand48_data *__restrict __buffer,
 457                       long int *__restrict __result)
 458      __THROW __nonnull ((1, 2));
 459 libc_hidden_proto(jrand48_r)
 460
 461 /* Seed random number generator.  */
 462 extern int srand48_r (long int __seedval, struct drand48_data *__buffer)
 463      __THROW __nonnull ((2));
 464 libc_hidden_proto(srand48_r)
 465
 466 extern int seed48_r (unsigned short int __seed16v[3],
 467                      struct drand48_data *__buffer) __THROW __nonnull ((1, 2));
 468 libc_hidden_proto(seed48_r)
 469
 470 extern int lcong48_r (unsigned short int __param[7],
 471                       struct drand48_data *__buffer)
 472      __THROW __nonnull ((1, 2));
 473 # endif /* Use misc.  */
 474 #endif  /* Use SVID or X/Open.  */
 475
 476 #endif /* don't just need malloc and calloc */
 477
 478 #ifndef __malloc_and_calloc_defined
 479 # define __malloc_and_calloc_defined
 480 __BEGIN_NAMESPACE_STD
 481 /* Allocate SIZE bytes of memory.  */
 482 extern void *malloc (size_t __size) __THROW __attribute_malloc__ __wur;
 483 /* We want the malloc symbols overridable at runtime
 484  * libc_hidden_proto(malloc) */
 485 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
 486 extern void *calloc (size_t __nmemb, size_t __size)
 487      __THROW __attribute_malloc__ __wur;
 488 __END_NAMESPACE_STD
 489 #endif
 490
 491 #ifndef __need_malloc_and_calloc
 492 __BEGIN_NAMESPACE_STD
 493 /* Re-allocate the previously allocated block
 494    in PTR, making the new block SIZE bytes long.  */
 495 /* __attribute_malloc__ is not used, because if realloc returns
 496    the same pointer that was passed to it, aliasing needs to be allowed
 497    between objects pointed by the old and new pointers.  */
 498 extern void *realloc (void *__ptr, size_t __size)
 499      __THROW __attribute_warn_unused_result__;
 500 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
 501 extern void free (void *__ptr) __THROW;
 502 __END_NAMESPACE_STD
 503
 504 #if 0 /*def     __USE_MISC*/
 505 /* Free a block.  An alias for `free'.  (Sun Unices).  */
 506 extern void cfree (void *__ptr) __THROW;
 507 #endif /* Use misc.  */
 508
 509 #if defined __USE_GNU || defined __USE_BSD || defined __USE_MISC
 510 # include <alloca.h>
 511 #endif /* Use GNU, BSD, or misc.  */
 512
 513 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 514 /* Allocate SIZE bytes on a page boundary.  The storage cannot be freed.  */
 515 extern void *valloc (size_t __size) __THROW __attribute_malloc__ __wur;
 516 #endif
 517
 518 #if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
 519 /* Allocate memory of SIZE bytes with an alignment of ALIGNMENT.  */
 520 extern int posix_memalign (void **__memptr, size_t __alignment, size_t __size)
 521      __THROW __nonnull ((1)) __wur;
 522 #endif
 523
 524 __BEGIN_NAMESPACE_STD
 525 /* Abort execution and generate a core-dump.  */
 526 extern void abort (void) __THROW __attribute__ ((__noreturn__));
 527 libc_hidden_proto(abort)
 528
 529
 530 /* Register a function to be called when `exit' is called.  */
 531 extern int atexit (void (*__func) (void)) __THROW __nonnull ((1));
 532 __END_NAMESPACE_STD
 533
 534 #ifdef  __USE_MISC
 535 /* Register a function to be called with the status
 536    given to `exit' and the given argument.  */
 537 extern int on_exit (void (*__func) (int __status, void *__arg), void *__arg)
 538      __THROW __nonnull ((1));
 539 #endif
 540
 541 __BEGIN_NAMESPACE_STD
 542 /* Call all functions registered with `atexit' and `on_exit',
 543    in the reverse of the order in which they were registered
 544    perform stdio cleanup, and terminate program execution with STATUS.  */
 545 extern void exit (int __status) __THROW __attribute__ ((__noreturn__));
 546 libc_hidden_proto(exit)
 547 __END_NAMESPACE_STD
 548
 549 #ifdef __USE_ISOC99
 550 __BEGIN_NAMESPACE_C99
 551 /* Terminate the program with STATUS without calling any of the
 552    functions registered with `atexit' or `on_exit'.  */
 553 extern void _Exit (int __status) __THROW __attribute__ ((__noreturn__));
 554 __END_NAMESPACE_C99
 555 #endif
 556
 557
 558 __BEGIN_NAMESPACE_STD
 559 /* Return the value of envariable NAME, or NULL if it doesn't exist.  */
 560 extern char *getenv (__const char *__name) __THROW __nonnull ((1)) __wur;
 561 libc_hidden_proto(getenv)
 562 __END_NAMESPACE_STD
 563
 564 #if 0
 565 /* This function is similar to the above but returns NULL if the
 566    programs is running with SUID or SGID enabled.  */
 567 extern char *__secure_getenv (__const char *__name)
 568      __THROW __nonnull ((1)) __wur;
 569 #endif
 570
 571 #if defined __USE_SVID || defined __USE_XOPEN
 572 /* The SVID says this is in <stdio.h>, but this seems a better place.   */
 573 /* Put STRING, which is of the form "NAME=VALUE", in the environment.
 574    If there is no `=', remove NAME from the environment.  */
 575 extern int putenv (char *__string) __THROW __nonnull ((1));
 576 #endif
 577
 578 #if defined __USE_BSD || defined __USE_XOPEN2K
 579 /* Set NAME to VALUE in the environment.
 580    If REPLACE is nonzero, overwrite an existing value.  */
 581 extern int setenv (__const char *__name, __const char *__value, int __replace)
 582      __THROW __nonnull ((2));
 583 libc_hidden_proto(setenv)
 584
 585 /* Remove the variable NAME from the environment.  */
 586 extern int unsetenv (__const char *__name) __THROW;
 587 libc_hidden_proto(unsetenv)
 588 #endif
 589
 590 /* The following is used by uClibc in atexit.c and sysconf.c */
 591 /* We have no limit when __UCLIBC_DYNAMIC_ATEXIT__ is enabled.  */
 592 #ifdef __UCLIBC_DYNAMIC_ATEXIT__
 593 # define __UCLIBC_MAX_ATEXIT     INT_MAX
 594 #else
 595 # define __UCLIBC_MAX_ATEXIT     20
 596 #endif
 597
 598
 599 #ifdef  __USE_MISC
 600 /* The `clearenv' was planned to be added to POSIX.1 but probably
 601    never made it.  Nevertheless the POSIX.9 standard (POSIX bindings
 602    for Fortran 77) requires this function.  */
 603 extern int clearenv (void) __THROW;
 604 #endif
 605
 606
 607 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
 608 # if defined __UCLIBC_SUSV3_LEGACY__
 609 /* Generate a unique temporary file name from TEMPLATE.
 610    The last six characters of TEMPLATE must be "XXXXXX";
 611    they are replaced with a string that makes the file name unique.
 612    Returns TEMPLATE, or a null pointer if it cannot get a unique file name.  */
 613 extern char *mktemp (char *__template) __THROW __nonnull ((1)) __wur;
 614 # endif
 615
 616 /* Generate a unique temporary file name from TEMPLATE.
 617    The last six characters of TEMPLATE must be "XXXXXX";
 618    they are replaced with a string that makes the filename unique.
 619    Returns a file descriptor open on the file for reading and writing,
 620    or -1 if it cannot create a uniquely-named file.
 621
 622    This function is a possible cancellation points and therefore not
 623    marked with __THROW.  */
 624 # ifndef __USE_FILE_OFFSET64
 625 extern int mkstemp (char *__template) __nonnull ((1)) __wur;
 626 # else
 627 #  ifdef __REDIRECT
 628 extern int __REDIRECT (mkstemp, (char *__template), mkstemp64)
 629      __nonnull ((1)) __wur;
 630 #  else
 631 #   define mkstemp mkstemp64
 632 #  endif
 633 # endif
 634 # ifdef __USE_LARGEFILE64
 635 extern int mkstemp64 (char *__template) __nonnull ((1)) __wur;
 636 # endif
 637 #endif
 638
 639 #ifdef __USE_BSD
 640 /* Create a unique temporary directory from TEMPLATE.
 641    The last six characters of TEMPLATE must be "XXXXXX";
 642    they are replaced with a string that makes the directory name unique.
 643    Returns TEMPLATE, or a null pointer if it cannot get a unique name.
 644    The directory is created mode 700.  */
 645 extern char *mkdtemp (char *__template) __THROW __nonnull ((1)) __wur;
 646 #endif
 647
 648
 649 __BEGIN_NAMESPACE_STD
 650 /* Execute the given line as a shell command.
 651
 652    This function is a cancellation point and therefore not marked with
 653    __THROW.  */
 654 extern int system (__const char *__command) __wur;
 655 __END_NAMESPACE_STD
 656
 657
 658 #if 0 /* def    __USE_GNU */
 659 /* Return a malloc'd string containing the canonical absolute name of the
 660    existing named file.  */
 661 extern char *canonicalize_file_name (__const char *__name)
 662      __THROW __nonnull ((1)) __wur;
 663 #endif
 664
 665 /* Return the canonical absolute name of file NAME.  If RESOLVED is
 666    null, the result is malloc'd; otherwise, if the canonical name is
 667    PATH_MAX chars or more, returns null with `errno' set to
 668    ENAMETOOLONG; if the name fits in fewer than PATH_MAX chars,
 669    returns the name in RESOLVED.  */
 670 /* we choose to handle __resolved==NULL as crash :) */
 671 extern char *realpath (__const char *__restrict __name,
 672                        char *__restrict __resolved) __THROW __wur;
 673
 674
 675 /* Shorthand for type of comparison functions.  */
 676 #ifndef __COMPAR_FN_T
 677 # define __COMPAR_FN_T
 678 typedef int (*__compar_fn_t) (__const void *, __const void *);
 679
 680 # ifdef __USE_GNU
 681 typedef __compar_fn_t comparison_fn_t;
 682 # endif
 683 #endif
 684
 685 __BEGIN_NAMESPACE_STD
 686 /* Do a binary search for KEY in BASE, which consists of NMEMB elements
 687    of SIZE bytes each, using COMPAR to perform the comparisons.  */
 688 extern void *bsearch (__const void *__key, __const void *__base,
 689                       size_t __nmemb, size_t __size, __compar_fn_t __compar)
 690      __nonnull ((1, 2, 5)) __wur;
 691
 692 /* Sort NMEMB elements of BASE, of SIZE bytes each,
 693    using COMPAR to perform the comparisons.  */
 694 extern void qsort (void *__base, size_t __nmemb, size_t __size,
 695                    __compar_fn_t __compar) __nonnull ((1, 4));
 696 libc_hidden_proto(qsort)
 697
 698
 699 /* Return the absolute value of X.  */
 700 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
 701 extern long int labs (long int __x) __THROW __attribute__ ((__const__)) __wur;
 702 __END_NAMESPACE_STD
 703
 704 #ifdef __USE_ISOC99
 705 __extension__ extern long long int llabs (long long int __x)
 706      __THROW __attribute__ ((__const__)) __wur;
 707 #endif
 708
 709
 710 __BEGIN_NAMESPACE_STD
 711 /* Return the `div_t', `ldiv_t' or `lldiv_t' representation
 712    of the value of NUMER over DENOM. */
 713 /* GCC may have built-ins for these someday.  */
 714 extern div_t div (int __numer, int __denom)
 715      __THROW __attribute__ ((__const__)) __wur;
 716 extern ldiv_t ldiv (long int __numer, long int __denom)
 717      __THROW __attribute__ ((__const__)) __wur;
 718 __END_NAMESPACE_STD
 719
 720 #ifdef __USE_ISOC99
 721 __BEGIN_NAMESPACE_C99
 722 __extension__ extern lldiv_t lldiv (long long int __numer,
 723                                     long long int __denom)
 724      __THROW __attribute__ ((__const__)) __wur;
 725 __END_NAMESPACE_C99
 726 #endif
 727
 728
 729 #if ( defined __USE_SVID || defined __USE_XOPEN_EXTENDED ) && defined __UCLIBC_HAS_FLOATS__
 730 /* Convert floating point numbers to strings.  The returned values are
 731    valid only until another call to the same function.  */
 732
 733 # ifdef __UCLIBC_SUSV3_LEGACY__
 734 #if 0
 735 /* Convert VALUE to a string with NDIGIT digits and return a pointer to
 736    this.  Set *DECPT with the position of the decimal character and *SIGN
 737    with the sign of the number.  */
 738 extern char *ecvt (double __value, int __ndigit, int *__restrict __decpt,
 739                    int *__restrict __sign) __THROW __nonnull ((3, 4)) __wur;
 740
 741 /* Convert VALUE to a string rounded to NDIGIT decimal digits.  Set *DECPT
 742    with the position of the decimal character and *SIGN with the sign of
 743    the number.  */
 744 extern char *fcvt (double __value, int __ndigit, int *__restrict __decpt,
 745                    int *__restrict __sign) __THROW __nonnull ((3, 4)) __wur;
 746 #endif
 747
 748 /* If possible convert VALUE to a string with NDIGIT significant digits.
 749    Otherwise use exponential representation.  The resulting string will
 750    be written to BUF.  */
 751 extern char *gcvt (double __value, int __ndigit, char *__buf)
 752      __THROW __nonnull ((3)) __wur;
 753 # endif /* __UCLIBC_SUSV3_LEGACY__ */
 754
 755
 756 # if 0 /*def __USE_MISC*/
 757 /* Long double versions of above functions.  */
 758 extern char *qecvt (long double __value, int __ndigit,
 759                     int *__restrict __decpt, int *__restrict __sign)
 760      __THROW __nonnull ((3, 4)) __wur;
 761 extern char *qfcvt (long double __value, int __ndigit,
 762                     int *__restrict __decpt, int *__restrict __sign)
 763      __THROW __nonnull ((3, 4)) __wur;
 764 extern char *qgcvt (long double __value, int __ndigit, char *__buf)
 765      __THROW __nonnull ((3)) __wur;
 766
 767
 768 /* Reentrant version of the functions above which provide their own
 769    buffers.  */
 770 extern int ecvt_r (double __value, int __ndigit, int *__restrict __decpt,
 771                    int *__restrict __sign, char *__restrict __buf,
 772                    size_t __len) __THROW __nonnull ((3, 4, 5));
 773 extern int fcvt_r (double __value, int __ndigit, int *__restrict __decpt,
 774                    int *__restrict __sign, char *__restrict __buf,
 775                    size_t __len) __THROW __nonnull ((3, 4, 5));
 776
 777 extern int qecvt_r (long double __value, int __ndigit,
 778                     int *__restrict __decpt, int *__restrict __sign,
 779                     char *__restrict __buf, size_t __len)
 780      __THROW __nonnull ((3, 4, 5));
 781 extern int qfcvt_r (long double __value, int __ndigit,
 782                     int *__restrict __decpt, int *__restrict __sign,
 783                     char *__restrict __buf, size_t __len)
 784      __THROW __nonnull ((3, 4, 5));
 785 # endif /* misc */
 786 #endif  /* use MISC || use X/Open Unix */
 787
 788
 789 #ifdef __UCLIBC_HAS_WCHAR__
 790 __BEGIN_NAMESPACE_STD
 791 /* Return the length of the multibyte character
 792    in S, which is no longer than N.  */
 793 extern int mblen (__const char *__s, size_t __n) __THROW __wur;
 794 /* Return the length of the given multibyte character,
 795    putting its `wchar_t' representation in *PWC.  */
 796 extern int mbtowc (wchar_t *__restrict __pwc,
 797                    __const char *__restrict __s, size_t __n) __THROW __wur;
 798 /* Put the multibyte character represented
 799    by WCHAR in S, returning its length.  */
 800 extern int wctomb (char *__s, wchar_t __wchar) __THROW __wur;
 801
 802
 803 /* Convert a multibyte string to a wide char string.  */
 804 extern size_t mbstowcs (wchar_t *__restrict  __pwcs,
 805                         __const char *__restrict __s, size_t __n) __THROW;
 806 /* Convert a wide char string to multibyte string.  */
 807 extern size_t wcstombs (char *__restrict __s,
 808                         __const wchar_t *__restrict __pwcs, size_t __n)
 809      __THROW;
 810 __END_NAMESPACE_STD
 811 #endif /* __UCLIBC_HAS_WCHAR__ */
 812
 813
 814 #if 0 /*def __USE_SVID*/
 815 /* Determine whether the string value of RESPONSE matches the affirmation
 816    or negative response expression as specified by the LC_MESSAGES category
 817    in the program's current locale.  Returns 1 if affirmative, 0 if
 818    negative, and -1 if not matching.  */
 819 extern int rpmatch (__const char *__response) __THROW __nonnull ((1)) __wur;
 820 #endif
 821
 822
 823 #ifdef __USE_XOPEN_EXTENDED
 824 /* Parse comma separated suboption from *OPTIONP and match against
 825    strings in TOKENS.  If found return index and set *VALUEP to
 826    optional value introduced by an equal sign.  If the suboption is
 827    not part of TOKENS return in *VALUEP beginning of unknown
 828    suboption.  On exit *OPTIONP is set to the beginning of the next
 829    token or at the terminating NUL character.  */
 830 extern int getsubopt (char **__restrict __optionp,
 831                       char *__const *__restrict __tokens,
 832                       char **__restrict __valuep)
 833      __THROW __nonnull ((1, 2, 3)) __wur;
 834 #endif
 835
 836
 837 #ifdef __USE_XOPEN
 838 # if defined __UCLIBC_HAS_CRYPT__
 839 /* Setup DES tables according KEY.  */
 840 extern void setkey (__const char *__key) __THROW __nonnull ((1));
 841 # endif /* __UCLIBC_HAS_CRYPT__ */
 842 #endif
 843
 844
 845 /* X/Open pseudo terminal handling.  */
 846
 847 #ifdef __USE_XOPEN2K
 848 /* Return a master pseudo-terminal handle.  */
 849 extern int posix_openpt (int __oflag) __wur;
 850 libc_hidden_proto(posix_openpt)
 851 #endif
 852
 853 #ifdef __USE_XOPEN
 854 /* The next four functions all take a master pseudo-tty fd and
 855    perform an operation on the associated slave:  */
 856 #ifdef __UCLIBC_HAS_PTY__
 857 /* Chown the slave to the calling user.  */
 858 extern int grantpt (int __fd) __THROW;
 859
 860 /* Release an internal lock so the slave can be opened.
 861    Call after grantpt().  */
 862 extern int unlockpt (int __fd) __THROW;
 863
 864 /* Return the pathname of the pseudo terminal slave assoicated with
 865    the master FD is open on, or NULL on errors.
 866    The returned storage is good until the next call to this function.  */
 867 extern char *ptsname (int __fd) __THROW __wur;
 868 #endif /* __UCLIBC_HAS_PTY__ */
 869 #endif
 870
 871 #ifdef __USE_GNU
 872 # if defined __UCLIBC_HAS_PTY__
 873 /* Store at most BUFLEN characters of the pathname of the slave pseudo
 874    terminal associated with the master FD is open on in BUF.
 875    Return 0 on success, otherwise an error number.  */
 876 extern int ptsname_r (int __fd, char *__buf, size_t __buflen)
 877      __THROW __nonnull ((2));
 878 libc_hidden_proto(ptsname_r)
 879 # endif
 880 # if defined __UCLIBC_HAS_GETPT__
 881 /* Open a master pseudo terminal and return its file descriptor.  */
 882 extern int getpt (void);
 883 # endif
 884 #endif
 885
 886 #if 0 /* def __USE_BSD */
 887 /* Put the 1 minute, 5 minute and 15 minute load averages into the first
 888    NELEM elements of LOADAVG.  Return the number written (never more than
 889    three, but may be less than NELEM), or -1 if an error occurred.  */
 890 extern int getloadavg (double __loadavg[], int __nelem)
 891      __THROW __nonnull ((1));
 892 #endif
 893
 894 #ifdef __UCLIBC_HAS_ARC4RANDOM__
 895 #include <stdint.h>
 896 extern uint32_t arc4random(void);
 897 extern void arc4random_stir(void);
 898 libc_hidden_proto(arc4random_stir)
 899 extern void arc4random_addrandom(unsigned char *, int);
 900 #endif
 901
 902 #endif /* don't just need malloc and calloc */
 903 #undef __need_malloc_and_calloc
 904
 905 __END_DECLS
 906
 907 #endif /* stdlib.h  */