stdlib/stdlib.h

   1 /* Copyright (C) 1991-2014 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    <http://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      ISO C99 Standard: 7.20 General utilities        <stdlib.h>
  20  */
  21
  22 #ifndef _STDLIB_H
  23
  24 #include <features.h>
  25
  26 /* Get size_t, wchar_t and NULL from <stddef.h>.  */
  27 #define         __need_size_t
  28 #ifndef __need_malloc_and_calloc
  29 # define        __need_wchar_t
  30 # define        __need_NULL
  31 #endif
  32 #include <stddef.h>
  33
  34 __BEGIN_DECLS
  35
  36 #ifndef __need_malloc_and_calloc
  37 #define _STDLIB_H       1
  38
  39 #if (defined __USE_XOPEN || defined __USE_XOPEN2K8) && !defined _SYS_WAIT_H
  40 /* XPG requires a few symbols from <sys/wait.h> being defined.  */
  41 # include <bits/waitflags.h>
  42 # include <bits/waitstatus.h>
  43
  44 # ifdef __USE_BSD
  45
  46 /* Lots of hair to allow traditional BSD use of `union wait'
  47    as well as POSIX.1 use of `int' for the status word.  */
  48
  49 #  if defined __GNUC__ && !defined __cplusplus
  50 #   define __WAIT_INT(status) \
  51   (__extension__ (((union { __typeof(status) __in; int __i; }) \
  52                    { .__in = (status) }).__i))
  53 #  else
  54 #   define __WAIT_INT(status)   (*(int *) &(status))
  55 #  endif
  56
  57 /* This is the type of the argument to `wait'.  The funky union
  58    causes redeclarations with either `int *' or `union wait *' to be
  59    allowed without complaint.  __WAIT_STATUS_DEFN is the type used in
  60    the actual function definitions.  */
  61
  62 #  if !defined __GNUC__ || __GNUC__ < 2 || defined __cplusplus
  63 #   define __WAIT_STATUS        void *
  64 #   define __WAIT_STATUS_DEFN   void *
  65 #  else
  66 /* This works in GCC 2.6.1 and later.  */
  67 typedef union
  68   {
  69     union wait *__uptr;
  70     int *__iptr;
  71   } __WAIT_STATUS __attribute__ ((__transparent_union__));
  72 #   define __WAIT_STATUS_DEFN   int *
  73 #  endif
  74
  75 # else /* Don't use BSD.  */
  76
  77 #  define __WAIT_INT(status)    (status)
  78 #  define __WAIT_STATUS         int *
  79 #  define __WAIT_STATUS_DEFN    int *
  80
  81 # endif /* Use BSD.  */
  82
  83 /* Define the macros <sys/wait.h> also would define this way.  */
  84 # define WEXITSTATUS(status)    __WEXITSTATUS (__WAIT_INT (status))
  85 # define WTERMSIG(status)       __WTERMSIG (__WAIT_INT (status))
  86 # define WSTOPSIG(status)       __WSTOPSIG (__WAIT_INT (status))
  87 # define WIFEXITED(status)      __WIFEXITED (__WAIT_INT (status))
  88 # define WIFSIGNALED(status)    __WIFSIGNALED (__WAIT_INT (status))
  89 # define WIFSTOPPED(status)     __WIFSTOPPED (__WAIT_INT (status))
  90 # ifdef __WIFCONTINUED
  91 #  define WIFCONTINUED(status)  __WIFCONTINUED (__WAIT_INT (status))
  92 # endif
  93 #endif  /* X/Open or XPG7 and <sys/wait.h> not included.  */
  94
  95 __BEGIN_NAMESPACE_STD
  96 /* Returned by `div'.  */
  97 typedef struct
  98   {
  99     int quot;                   /* Quotient.  */
 100     int rem;                    /* Remainder.  */
 101   } div_t;
 102
 103 /* Returned by `ldiv'.  */
 104 #ifndef __ldiv_t_defined
 105 typedef struct
 106   {
 107     long int quot;              /* Quotient.  */
 108     long int rem;               /* Remainder.  */
 109   } ldiv_t;
 110 # define __ldiv_t_defined       1
 111 #endif
 112 __END_NAMESPACE_STD
 113
 114 #if defined __USE_ISOC99 && !defined __lldiv_t_defined
 115 __BEGIN_NAMESPACE_C99
 116 /* Returned by `lldiv'.  */
 117 __extension__ typedef struct
 118   {
 119     long long int quot;         /* Quotient.  */
 120     long long int rem;          /* Remainder.  */
 121   } lldiv_t;
 122 # define __lldiv_t_defined      1
 123 __END_NAMESPACE_C99
 124 #endif
 125
 126
 127 /* The largest number rand will return (same as INT_MAX).  */
 128 #define RAND_MAX        2147483647
 129
 130
 131 /* We define these the same for all machines.
 132    Changes from this to the outside world should be done in `_exit'.  */
 133 #define EXIT_FAILURE    1       /* Failing exit status.  */
 134 #define EXIT_SUCCESS    0       /* Successful exit status.  */
 135
 136
 137 /* Maximum length of a multibyte character in the current locale.  */
 138 #define MB_CUR_MAX      (__ctype_get_mb_cur_max ())
 139 extern size_t __ctype_get_mb_cur_max (void) __THROW __wur;
 140
 141
 142 __BEGIN_NAMESPACE_STD
 143 /* Convert a string to a floating-point number.  */
 144 extern double atof (const char *__nptr)
 145      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 146 /* Convert a string to an integer.  */
 147 extern int atoi (const char *__nptr)
 148      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 149 /* Convert a string to a long integer.  */
 150 extern long int atol (const char *__nptr)
 151      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 152 __END_NAMESPACE_STD
 153
 154 #if defined __USE_ISOC99 || defined __USE_MISC
 155 __BEGIN_NAMESPACE_C99
 156 /* Convert a string to a long long integer.  */
 157 __extension__ extern long long int atoll (const char *__nptr)
 158      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 159 __END_NAMESPACE_C99
 160 #endif
 161
 162 __BEGIN_NAMESPACE_STD
 163 /* Convert a string to a floating-point number.  */
 164 extern double strtod (const char *__restrict __nptr,
 165                       char **__restrict __endptr)
 166      __THROW __nonnull ((1));
 167 __END_NAMESPACE_STD
 168
 169 #ifdef  __USE_ISOC99
 170 __BEGIN_NAMESPACE_C99
 171 /* Likewise for `float' and `long double' sizes of floating-point numbers.  */
 172 extern float strtof (const char *__restrict __nptr,
 173                      char **__restrict __endptr) __THROW __nonnull ((1));
 174
 175 extern long double strtold (const char *__restrict __nptr,
 176                             char **__restrict __endptr)
 177      __THROW __nonnull ((1));
 178 __END_NAMESPACE_C99
 179 #endif
 180
 181 __BEGIN_NAMESPACE_STD
 182 /* Convert a string to a long integer.  */
 183 extern long int strtol (const char *__restrict __nptr,
 184                         char **__restrict __endptr, int __base)
 185      __THROW __nonnull ((1));
 186 /* Convert a string to an unsigned long integer.  */
 187 extern unsigned long int strtoul (const char *__restrict __nptr,
 188                                   char **__restrict __endptr, int __base)
 189      __THROW __nonnull ((1));
 190 __END_NAMESPACE_STD
 191
 192 #ifdef __USE_BSD
 193 /* Convert a string to a quadword integer.  */
 194 __extension__
 195 extern long long int strtoq (const char *__restrict __nptr,
 196                              char **__restrict __endptr, int __base)
 197      __THROW __nonnull ((1));
 198 /* Convert a string to an unsigned quadword integer.  */
 199 __extension__
 200 extern unsigned long long int strtouq (const char *__restrict __nptr,
 201                                        char **__restrict __endptr, int __base)
 202      __THROW __nonnull ((1));
 203 #endif /* Use BSD.  */
 204
 205 #if defined __USE_ISOC99 || defined __USE_MISC
 206 __BEGIN_NAMESPACE_C99
 207 /* Convert a string to a quadword integer.  */
 208 __extension__
 209 extern long long int strtoll (const char *__restrict __nptr,
 210                               char **__restrict __endptr, int __base)
 211      __THROW __nonnull ((1));
 212 /* Convert a string to an unsigned quadword integer.  */
 213 __extension__
 214 extern unsigned long long int strtoull (const char *__restrict __nptr,
 215                                         char **__restrict __endptr, int __base)
 216      __THROW __nonnull ((1));
 217 __END_NAMESPACE_C99
 218 #endif /* ISO C99 or use MISC.  */
 219
 220
 221 #ifdef __USE_GNU
 222 /* The concept of one static locale per category is not very well
 223    thought out.  Many applications will need to process its data using
 224    information from several different locales.  Another problem is
 225    the implementation of the internationalization handling in the
 226    ISO C++ standard library.  To support this another set of
 227    the functions using locale data exist which take an additional
 228    argument.
 229
 230    Attention: even though several *_l interfaces are part of POSIX:2008,
 231    these are not.  */
 232
 233 /* Structure for reentrant locale using functions.  This is an
 234    (almost) opaque type for the user level programs.  */
 235 # include <xlocale.h>
 236
 237 /* Special versions of the functions above which take the locale to
 238    use as an additional parameter.  */
 239 extern long int strtol_l (const char *__restrict __nptr,
 240                           char **__restrict __endptr, int __base,
 241                           __locale_t __loc) __THROW __nonnull ((1, 4));
 242
 243 extern unsigned long int strtoul_l (const char *__restrict __nptr,
 244                                     char **__restrict __endptr,
 245                                     int __base, __locale_t __loc)
 246      __THROW __nonnull ((1, 4));
 247
 248 __extension__
 249 extern long long int strtoll_l (const char *__restrict __nptr,
 250                                 char **__restrict __endptr, int __base,
 251                                 __locale_t __loc)
 252      __THROW __nonnull ((1, 4));
 253
 254 __extension__
 255 extern unsigned long long int strtoull_l (const char *__restrict __nptr,
 256                                           char **__restrict __endptr,
 257                                           int __base, __locale_t __loc)
 258      __THROW __nonnull ((1, 4));
 259
 260 extern double strtod_l (const char *__restrict __nptr,
 261                         char **__restrict __endptr, __locale_t __loc)
 262      __THROW __nonnull ((1, 3));
 263
 264 extern float strtof_l (const char *__restrict __nptr,
 265                        char **__restrict __endptr, __locale_t __loc)
 266      __THROW __nonnull ((1, 3));
 267
 268 extern long double strtold_l (const char *__restrict __nptr,
 269                               char **__restrict __endptr,
 270                               __locale_t __loc)
 271      __THROW __nonnull ((1, 3));
 272 #endif /* GNU */
 273
 274
 275 #ifdef __USE_EXTERN_INLINES
 276 __BEGIN_NAMESPACE_STD
 277 __extern_inline int
 278 __NTH (atoi (const char *__nptr))
 279 {
 280   return (int) strtol (__nptr, (char **) NULL, 10);
 281 }
 282 __extern_inline long int
 283 __NTH (atol (const char *__nptr))
 284 {
 285   return strtol (__nptr, (char **) NULL, 10);
 286 }
 287 __END_NAMESPACE_STD
 288
 289 # if defined __USE_MISC || defined __USE_ISOC99
 290 __BEGIN_NAMESPACE_C99
 291 __extension__ __extern_inline long long int
 292 __NTH (atoll (const char *__nptr))
 293 {
 294   return strtoll (__nptr, (char **) NULL, 10);
 295 }
 296 __END_NAMESPACE_C99
 297 # endif
 298 #endif /* Optimizing and Inlining.  */
 299
 300
 301 #if defined __USE_SVID || defined __USE_XOPEN_EXTENDED
 302 /* Convert N to base 64 using the digits "./0-9A-Za-z", least-significant
 303    digit first.  Returns a pointer to static storage overwritten by the
 304    next call.  */
 305 extern char *l64a (long int __n) __THROW __wur;
 306
 307 /* Read a number from a string S in base 64 as above.  */
 308 extern long int a64l (const char *__s)
 309      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 310
 311 #endif  /* Use SVID || extended X/Open.  */
 312
 313 #if defined __USE_SVID || defined __USE_XOPEN_EXTENDED || defined __USE_BSD
 314 # include <sys/types.h> /* we need int32_t... */
 315
 316 /* These are the functions that actually do things.  The `random', `srandom',
 317    `initstate' and `setstate' functions are those from BSD Unices.
 318    The `rand' and `srand' functions are required by the ANSI standard.
 319    We provide both interfaces to the same random number generator.  */
 320 /* Return a random long integer between 0 and RAND_MAX inclusive.  */
 321 extern long int random (void) __THROW;
 322
 323 /* Seed the random number generator with the given number.  */
 324 extern void srandom (unsigned int __seed) __THROW;
 325
 326 /* Initialize the random number generator to use state buffer STATEBUF,
 327    of length STATELEN, and seed it with SEED.  Optimal lengths are 8, 16,
 328    32, 64, 128 and 256, the bigger the better; values less than 8 will
 329    cause an error and values greater than 256 will be rounded down.  */
 330 extern char *initstate (unsigned int __seed, char *__statebuf,
 331                         size_t __statelen) __THROW __nonnull ((2));
 332
 333 /* Switch the random number generator to state buffer STATEBUF,
 334    which should have been previously initialized by `initstate'.  */
 335 extern char *setstate (char *__statebuf) __THROW __nonnull ((1));
 336
 337
 338 # ifdef __USE_MISC
 339 /* Reentrant versions of the `random' family of functions.
 340    These functions all use the following data structure to contain
 341    state, rather than global state variables.  */
 342
 343 struct random_data
 344   {
 345     int32_t *fptr;              /* Front pointer.  */
 346     int32_t *rptr;              /* Rear pointer.  */
 347     int32_t *state;             /* Array of state values.  */
 348     int rand_type;              /* Type of random number generator.  */
 349     int rand_deg;               /* Degree of random number generator.  */
 350     int rand_sep;               /* Distance between front and rear.  */
 351     int32_t *end_ptr;           /* Pointer behind state table.  */
 352   };
 353
 354 extern int random_r (struct random_data *__restrict __buf,
 355                      int32_t *__restrict __result) __THROW __nonnull ((1, 2));
 356
 357 extern int srandom_r (unsigned int __seed, struct random_data *__buf)
 358      __THROW __nonnull ((2));
 359
 360 extern int initstate_r (unsigned int __seed, char *__restrict __statebuf,
 361                         size_t __statelen,
 362                         struct random_data *__restrict __buf)
 363      __THROW __nonnull ((2, 4));
 364
 365 extern int setstate_r (char *__restrict __statebuf,
 366                        struct random_data *__restrict __buf)
 367      __THROW __nonnull ((1, 2));
 368 # endif /* Use misc.  */
 369 #endif  /* Use SVID || extended X/Open || BSD. */
 370
 371
 372 __BEGIN_NAMESPACE_STD
 373 /* Return a random integer between 0 and RAND_MAX inclusive.  */
 374 extern int rand (void) __THROW;
 375 /* Seed the random number generator with the given number.  */
 376 extern void srand (unsigned int __seed) __THROW;
 377 __END_NAMESPACE_STD
 378
 379 #ifdef __USE_POSIX
 380 /* Reentrant interface according to POSIX.1.  */
 381 extern int rand_r (unsigned int *__seed) __THROW;
 382 #endif
 383
 384
 385 #if defined __USE_SVID || defined __USE_XOPEN
 386 /* System V style 48-bit random number generator functions.  */
 387
 388 /* Return non-negative, double-precision floating-point value in [0.0,1.0).  */
 389 extern double drand48 (void) __THROW;
 390 extern double erand48 (unsigned short int __xsubi[3]) __THROW __nonnull ((1));
 391
 392 /* Return non-negative, long integer in [0,2^31).  */
 393 extern long int lrand48 (void) __THROW;
 394 extern long int nrand48 (unsigned short int __xsubi[3])
 395      __THROW __nonnull ((1));
 396
 397 /* Return signed, long integers in [-2^31,2^31).  */
 398 extern long int mrand48 (void) __THROW;
 399 extern long int jrand48 (unsigned short int __xsubi[3])
 400      __THROW __nonnull ((1));
 401
 402 /* Seed random number generator.  */
 403 extern void srand48 (long int __seedval) __THROW;
 404 extern unsigned short int *seed48 (unsigned short int __seed16v[3])
 405      __THROW __nonnull ((1));
 406 extern void lcong48 (unsigned short int __param[7]) __THROW __nonnull ((1));
 407
 408 # ifdef __USE_MISC
 409 /* Data structure for communication with thread safe versions.  This
 410    type is to be regarded as opaque.  It's only exported because users
 411    have to allocate objects of this type.  */
 412 struct drand48_data
 413   {
 414     unsigned short int __x[3];  /* Current state.  */
 415     unsigned short int __old_x[3]; /* Old state.  */
 416     unsigned short int __c;     /* Additive const. in congruential formula.  */
 417     unsigned short int __init;  /* Flag for initializing.  */
 418     __extension__ unsigned long long int __a;   /* Factor in congruential
 419                                                    formula.  */
 420   };
 421
 422 /* Return non-negative, double-precision floating-point value in [0.0,1.0).  */
 423 extern int drand48_r (struct drand48_data *__restrict __buffer,
 424                       double *__restrict __result) __THROW __nonnull ((1, 2));
 425 extern int erand48_r (unsigned short int __xsubi[3],
 426                       struct drand48_data *__restrict __buffer,
 427                       double *__restrict __result) __THROW __nonnull ((1, 2));
 428
 429 /* Return non-negative, long integer in [0,2^31).  */
 430 extern int lrand48_r (struct drand48_data *__restrict __buffer,
 431                       long int *__restrict __result)
 432      __THROW __nonnull ((1, 2));
 433 extern int nrand48_r (unsigned short int __xsubi[3],
 434                       struct drand48_data *__restrict __buffer,
 435                       long int *__restrict __result)
 436      __THROW __nonnull ((1, 2));
 437
 438 /* Return signed, long integers in [-2^31,2^31).  */
 439 extern int mrand48_r (struct drand48_data *__restrict __buffer,
 440                       long int *__restrict __result)
 441      __THROW __nonnull ((1, 2));
 442 extern int jrand48_r (unsigned short int __xsubi[3],
 443                       struct drand48_data *__restrict __buffer,
 444                       long int *__restrict __result)
 445      __THROW __nonnull ((1, 2));
 446
 447 /* Seed random number generator.  */
 448 extern int srand48_r (long int __seedval, struct drand48_data *__buffer)
 449      __THROW __nonnull ((2));
 450
 451 extern int seed48_r (unsigned short int __seed16v[3],
 452                      struct drand48_data *__buffer) __THROW __nonnull ((1, 2));
 453
 454 extern int lcong48_r (unsigned short int __param[7],
 455                       struct drand48_data *__buffer)
 456      __THROW __nonnull ((1, 2));
 457 # endif /* Use misc.  */
 458 #endif  /* Use SVID or X/Open.  */
 459
 460 #endif /* don't just need malloc and calloc */
 461
 462 #ifndef __malloc_and_calloc_defined
 463 # define __malloc_and_calloc_defined
 464 __BEGIN_NAMESPACE_STD
 465 /* Allocate SIZE bytes of memory.  */
 466 extern void *malloc (size_t __size) __THROW __attribute_malloc__ __wur;
 467 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
 468 extern void *calloc (size_t __nmemb, size_t __size)
 469      __THROW __attribute_malloc__ __wur;
 470 __END_NAMESPACE_STD
 471 #endif
 472
 473 #ifndef __need_malloc_and_calloc
 474 __BEGIN_NAMESPACE_STD
 475 /* Re-allocate the previously allocated block
 476    in PTR, making the new block SIZE bytes long.  */
 477 /* __attribute_malloc__ is not used, because if realloc returns
 478    the same pointer that was passed to it, aliasing needs to be allowed
 479    between objects pointed by the old and new pointers.  */
 480 extern void *realloc (void *__ptr, size_t __size)
 481      __THROW __attribute_warn_unused_result__;
 482 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
 483 extern void free (void *__ptr) __THROW;
 484 __END_NAMESPACE_STD
 485
 486 #ifdef  __USE_MISC
 487 /* Free a block.  An alias for `free'.  (Sun Unices).  */
 488 extern void cfree (void *__ptr) __THROW;
 489 #endif /* Use misc.  */
 490
 491 #if defined __USE_GNU || defined __USE_BSD || defined __USE_MISC
 492 # include <alloca.h>
 493 #endif /* Use GNU, BSD, or misc.  */
 494
 495 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K) \
 496     || defined __USE_BSD
 497 /* Allocate SIZE bytes on a page boundary.  The storage cannot be freed.  */
 498 extern void *valloc (size_t __size) __THROW __attribute_malloc__ __wur;
 499 #endif
 500
 501 #ifdef __USE_XOPEN2K
 502 /* Allocate memory of SIZE bytes with an alignment of ALIGNMENT.  */
 503 extern int posix_memalign (void **__memptr, size_t __alignment, size_t __size)
 504      __THROW __nonnull ((1)) __wur;
 505 #endif
 506
 507 #ifdef __USE_ISOC11
 508 /* ISO C variant of aligned allocation.  */
 509 extern void *aligned_alloc (size_t __alignment, size_t __size)
 510      __THROW __attribute_malloc__ __attribute_alloc_size__ ((2)) __wur;
 511 #endif
 512
 513 __BEGIN_NAMESPACE_STD
 514 /* Abort execution and generate a core-dump.  */
 515 extern void abort (void) __THROW __attribute__ ((__noreturn__));
 516
 517
 518 /* Register a function to be called when `exit' is called.  */
 519 extern int atexit (void (*__func) (void)) __THROW __nonnull ((1));
 520
 521 #if defined __USE_ISOC11 || defined __USE_ISOCXX11
 522 /* Register a function to be called when `quick_exit' is called.  */
 523 # ifdef __cplusplus
 524 extern "C++" int at_quick_exit (void (*__func) (void))
 525      __THROW __asm ("at_quick_exit") __nonnull ((1));
 526 # else
 527 extern int at_quick_exit (void (*__func) (void)) __THROW __nonnull ((1));
 528 # endif
 529 #endif
 530 __END_NAMESPACE_STD
 531
 532 #ifdef  __USE_MISC
 533 /* Register a function to be called with the status
 534    given to `exit' and the given argument.  */
 535 extern int on_exit (void (*__func) (int __status, void *__arg), void *__arg)
 536      __THROW __nonnull ((1));
 537 #endif
 538
 539 __BEGIN_NAMESPACE_STD
 540 /* Call all functions registered with `atexit' and `on_exit',
 541    in the reverse of the order in which they were registered,
 542    perform stdio cleanup, and terminate program execution with STATUS.  */
 543 extern void exit (int __status) __THROW __attribute__ ((__noreturn__));
 544
 545 #if defined __USE_ISOC11 || defined __USE_ISOCXX11
 546 /* Call all functions registered with `at_quick_exit' in the reverse
 547    of the order in which they were registered and terminate program
 548    execution with STATUS.  */
 549 extern void quick_exit (int __status) __THROW __attribute__ ((__noreturn__));
 550 #endif
 551 __END_NAMESPACE_STD
 552
 553 #ifdef __USE_ISOC99
 554 __BEGIN_NAMESPACE_C99
 555 /* Terminate the program with STATUS without calling any of the
 556    functions registered with `atexit' or `on_exit'.  */
 557 extern void _Exit (int __status) __THROW __attribute__ ((__noreturn__));
 558 __END_NAMESPACE_C99
 559 #endif
 560
 561
 562 __BEGIN_NAMESPACE_STD
 563 /* Return the value of envariable NAME, or NULL if it doesn't exist.  */
 564 extern char *getenv (const char *__name) __THROW __nonnull ((1)) __wur;
 565 __END_NAMESPACE_STD
 566
 567 #ifdef __USE_GNU
 568 /* This function is similar to the above but returns NULL if the
 569    programs is running with SUID or SGID enabled.  */
 570 extern char *secure_getenv (const char *__name)
 571      __THROW __nonnull ((1)) __wur;
 572 #endif
 573
 574 #if defined __USE_SVID || defined __USE_XOPEN
 575 /* The SVID says this is in <stdio.h>, but this seems a better place.   */
 576 /* Put STRING, which is of the form "NAME=VALUE", in the environment.
 577    If there is no `=', remove NAME from the environment.  */
 578 extern int putenv (char *__string) __THROW __nonnull ((1));
 579 #endif
 580
 581 #if defined __USE_BSD || defined __USE_XOPEN2K
 582 /* Set NAME to VALUE in the environment.
 583    If REPLACE is nonzero, overwrite an existing value.  */
 584 extern int setenv (const char *__name, const char *__value, int __replace)
 585      __THROW __nonnull ((2));
 586
 587 /* Remove the variable NAME from the environment.  */
 588 extern int unsetenv (const char *__name) __THROW __nonnull ((1));
 589 #endif
 590
 591 #ifdef  __USE_MISC
 592 /* The `clearenv' was planned to be added to POSIX.1 but probably
 593    never made it.  Nevertheless the POSIX.9 standard (POSIX bindings
 594    for Fortran 77) requires this function.  */
 595 extern int clearenv (void) __THROW;
 596 #endif
 597
 598
 599 #if defined __USE_MISC \
 600     || (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8)
 601 /* Generate a unique temporary file name from TEMPLATE.
 602    The last six characters of TEMPLATE must be "XXXXXX";
 603    they are replaced with a string that makes the file name unique.
 604    Always returns TEMPLATE, it's either a temporary file name or a null
 605    string if it cannot get a unique file name.  */
 606 extern char *mktemp (char *__template) __THROW __nonnull ((1));
 607 #endif
 608
 609 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED \
 610     || defined __USE_XOPEN2K8
 611 /* Generate a unique temporary file name from TEMPLATE.
 612    The last six characters of TEMPLATE must be "XXXXXX";
 613    they are replaced with a string that makes the filename unique.
 614    Returns a file descriptor open on the file for reading and writing,
 615    or -1 if it cannot create a uniquely-named file.
 616
 617    This function is a possible cancellation point and therefore not
 618    marked with __THROW.  */
 619 # ifndef __USE_FILE_OFFSET64
 620 extern int mkstemp (char *__template) __nonnull ((1)) __wur;
 621 # else
 622 #  ifdef __REDIRECT
 623 extern int __REDIRECT (mkstemp, (char *__template), mkstemp64)
 624      __nonnull ((1)) __wur;
 625 #  else
 626 #   define mkstemp mkstemp64
 627 #  endif
 628 # endif
 629 # ifdef __USE_LARGEFILE64
 630 extern int mkstemp64 (char *__template) __nonnull ((1)) __wur;
 631 # endif
 632 #endif
 633
 634 #ifdef __USE_MISC
 635 /* Similar to mkstemp, but the template can have a suffix after the
 636    XXXXXX.  The length of the suffix is specified in the second
 637    parameter.
 638
 639    This function is a possible cancellation point and therefore not
 640    marked with __THROW.  */
 641 # ifndef __USE_FILE_OFFSET64
 642 extern int mkstemps (char *__template, int __suffixlen) __nonnull ((1)) __wur;
 643 # else
 644 #  ifdef __REDIRECT
 645 extern int __REDIRECT (mkstemps, (char *__template, int __suffixlen),
 646                        mkstemps64) __nonnull ((1)) __wur;
 647 #  else
 648 #   define mkstemps mkstemps64
 649 #  endif
 650 # endif
 651 # ifdef __USE_LARGEFILE64
 652 extern int mkstemps64 (char *__template, int __suffixlen)
 653      __nonnull ((1)) __wur;
 654 # endif
 655 #endif
 656
 657 #if defined __USE_BSD || defined __USE_XOPEN2K8
 658 /* Create a unique temporary directory from TEMPLATE.
 659    The last six characters of TEMPLATE must be "XXXXXX";
 660    they are replaced with a string that makes the directory name unique.
 661    Returns TEMPLATE, or a null pointer if it cannot get a unique name.
 662    The directory is created mode 700.  */
 663 extern char *mkdtemp (char *__template) __THROW __nonnull ((1)) __wur;
 664 #endif
 665
 666 #ifdef __USE_GNU
 667 /* Generate a unique temporary file name from TEMPLATE similar to
 668    mkstemp.  But allow the caller to pass additional flags which are
 669    used in the open call to create the file..
 670
 671    This function is a possible cancellation point and therefore not
 672    marked with __THROW.  */
 673 # ifndef __USE_FILE_OFFSET64
 674 extern int mkostemp (char *__template, int __flags) __nonnull ((1)) __wur;
 675 # else
 676 #  ifdef __REDIRECT
 677 extern int __REDIRECT (mkostemp, (char *__template, int __flags), mkostemp64)
 678      __nonnull ((1)) __wur;
 679 #  else
 680 #   define mkostemp mkostemp64
 681 #  endif
 682 # endif
 683 # ifdef __USE_LARGEFILE64
 684 extern int mkostemp64 (char *__template, int __flags) __nonnull ((1)) __wur;
 685 # endif
 686
 687 /* Similar to mkostemp, but the template can have a suffix after the
 688    XXXXXX.  The length of the suffix is specified in the second
 689    parameter.
 690
 691    This function is a possible cancellation point and therefore not
 692    marked with __THROW.  */
 693 # ifndef __USE_FILE_OFFSET64
 694 extern int mkostemps (char *__template, int __suffixlen, int __flags)
 695      __nonnull ((1)) __wur;
 696 # else
 697 #  ifdef __REDIRECT
 698 extern int __REDIRECT (mkostemps, (char *__template, int __suffixlen,
 699                                    int __flags), mkostemps64)
 700      __nonnull ((1)) __wur;
 701 #  else
 702 #   define mkostemps mkostemps64
 703 #  endif
 704 # endif
 705 # ifdef __USE_LARGEFILE64
 706 extern int mkostemps64 (char *__template, int __suffixlen, int __flags)
 707      __nonnull ((1)) __wur;
 708 # endif
 709 #endif
 710
 711
 712 __BEGIN_NAMESPACE_STD
 713 /* Execute the given line as a shell command.
 714
 715    This function is a cancellation point and therefore not marked with
 716    __THROW.  */
 717 extern int system (const char *__command) __wur;
 718 __END_NAMESPACE_STD
 719
 720
 721 #ifdef  __USE_GNU
 722 /* Return a malloc'd string containing the canonical absolute name of the
 723    existing named file.  */
 724 extern char *canonicalize_file_name (const char *__name)
 725      __THROW __nonnull ((1)) __wur;
 726 #endif
 727
 728 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 729 /* Return the canonical absolute name of file NAME.  If RESOLVED is
 730    null, the result is malloc'd; otherwise, if the canonical name is
 731    PATH_MAX chars or more, returns null with `errno' set to
 732    ENAMETOOLONG; if the name fits in fewer than PATH_MAX chars,
 733    returns the name in RESOLVED.  */
 734 extern char *realpath (const char *__restrict __name,
 735                        char *__restrict __resolved) __THROW __wur;
 736 #endif
 737
 738
 739 /* Shorthand for type of comparison functions.  */
 740 #ifndef __COMPAR_FN_T
 741 # define __COMPAR_FN_T
 742 typedef int (*__compar_fn_t) (const void *, const void *);
 743
 744 # ifdef __USE_GNU
 745 typedef __compar_fn_t comparison_fn_t;
 746 # endif
 747 #endif
 748 #ifdef __USE_GNU
 749 typedef int (*__compar_d_fn_t) (const void *, const void *, void *);
 750 #endif
 751
 752 __BEGIN_NAMESPACE_STD
 753 /* Do a binary search for KEY in BASE, which consists of NMEMB elements
 754    of SIZE bytes each, using COMPAR to perform the comparisons.  */
 755 extern void *bsearch (const void *__key, const void *__base,
 756                       size_t __nmemb, size_t __size, __compar_fn_t __compar)
 757      __nonnull ((1, 2, 5)) __wur;
 758
 759 #ifdef __USE_EXTERN_INLINES
 760 # include <bits/stdlib-bsearch.h>
 761 #endif
 762
 763 /* Sort NMEMB elements of BASE, of SIZE bytes each,
 764    using COMPAR to perform the comparisons.  */
 765 extern void qsort (void *__base, size_t __nmemb, size_t __size,
 766                    __compar_fn_t __compar) __nonnull ((1, 4));
 767 #ifdef __USE_GNU
 768 extern void qsort_r (void *__base, size_t __nmemb, size_t __size,
 769                      __compar_d_fn_t __compar, void *__arg)
 770   __nonnull ((1, 4));
 771 #endif
 772
 773
 774 /* Return the absolute value of X.  */
 775 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
 776 extern long int labs (long int __x) __THROW __attribute__ ((__const__)) __wur;
 777 __END_NAMESPACE_STD
 778
 779 #ifdef __USE_ISOC99
 780 __extension__ extern long long int llabs (long long int __x)
 781      __THROW __attribute__ ((__const__)) __wur;
 782 #endif
 783
 784
 785 __BEGIN_NAMESPACE_STD
 786 /* Return the `div_t', `ldiv_t' or `lldiv_t' representation
 787    of the value of NUMER over DENOM. */
 788 /* GCC may have built-ins for these someday.  */
 789 extern div_t div (int __numer, int __denom)
 790      __THROW __attribute__ ((__const__)) __wur;
 791 extern ldiv_t ldiv (long int __numer, long int __denom)
 792      __THROW __attribute__ ((__const__)) __wur;
 793 __END_NAMESPACE_STD
 794
 795 #ifdef __USE_ISOC99
 796 __BEGIN_NAMESPACE_C99
 797 __extension__ extern lldiv_t lldiv (long long int __numer,
 798                                     long long int __denom)
 799      __THROW __attribute__ ((__const__)) __wur;
 800 __END_NAMESPACE_C99
 801 #endif
 802
 803
 804 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \
 805     || defined __USE_SVID
 806 /* Convert floating point numbers to strings.  The returned values are
 807    valid only until another call to the same function.  */
 808
 809 /* Convert VALUE to a string with NDIGIT digits and return a pointer to
 810    this.  Set *DECPT with the position of the decimal character and *SIGN
 811    with the sign of the number.  */
 812 extern char *ecvt (double __value, int __ndigit, int *__restrict __decpt,
 813                    int *__restrict __sign) __THROW __nonnull ((3, 4)) __wur;
 814
 815 /* Convert VALUE to a string rounded to NDIGIT decimal digits.  Set *DECPT
 816    with the position of the decimal character and *SIGN with the sign of
 817    the number.  */
 818 extern char *fcvt (double __value, int __ndigit, int *__restrict __decpt,
 819                    int *__restrict __sign) __THROW __nonnull ((3, 4)) __wur;
 820
 821 /* If possible convert VALUE to a string with NDIGIT significant digits.
 822    Otherwise use exponential representation.  The resulting string will
 823    be written to BUF.  */
 824 extern char *gcvt (double __value, int __ndigit, char *__buf)
 825      __THROW __nonnull ((3)) __wur;
 826 #endif
 827
 828 #ifdef __USE_MISC
 829 /* Long double versions of above functions.  */
 830 extern char *qecvt (long double __value, int __ndigit,
 831                     int *__restrict __decpt, int *__restrict __sign)
 832      __THROW __nonnull ((3, 4)) __wur;
 833 extern char *qfcvt (long double __value, int __ndigit,
 834                     int *__restrict __decpt, int *__restrict __sign)
 835      __THROW __nonnull ((3, 4)) __wur;
 836 extern char *qgcvt (long double __value, int __ndigit, char *__buf)
 837      __THROW __nonnull ((3)) __wur;
 838
 839
 840 /* Reentrant version of the functions above which provide their own
 841    buffers.  */
 842 extern int ecvt_r (double __value, int __ndigit, int *__restrict __decpt,
 843                    int *__restrict __sign, char *__restrict __buf,
 844                    size_t __len) __THROW __nonnull ((3, 4, 5));
 845 extern int fcvt_r (double __value, int __ndigit, int *__restrict __decpt,
 846                    int *__restrict __sign, char *__restrict __buf,
 847                    size_t __len) __THROW __nonnull ((3, 4, 5));
 848
 849 extern int qecvt_r (long double __value, int __ndigit,
 850                     int *__restrict __decpt, int *__restrict __sign,
 851                     char *__restrict __buf, size_t __len)
 852      __THROW __nonnull ((3, 4, 5));
 853 extern int qfcvt_r (long double __value, int __ndigit,
 854                     int *__restrict __decpt, int *__restrict __sign,
 855                     char *__restrict __buf, size_t __len)
 856      __THROW __nonnull ((3, 4, 5));
 857 #endif  /* misc */
 858
 859
 860 __BEGIN_NAMESPACE_STD
 861 /* Return the length of the multibyte character
 862    in S, which is no longer than N.  */
 863 extern int mblen (const char *__s, size_t __n) __THROW;
 864 /* Return the length of the given multibyte character,
 865    putting its `wchar_t' representation in *PWC.  */
 866 extern int mbtowc (wchar_t *__restrict __pwc,
 867                    const char *__restrict __s, size_t __n) __THROW;
 868 /* Put the multibyte character represented
 869    by WCHAR in S, returning its length.  */
 870 extern int wctomb (char *__s, wchar_t __wchar) __THROW;
 871
 872
 873 /* Convert a multibyte string to a wide char string.  */
 874 extern size_t mbstowcs (wchar_t *__restrict  __pwcs,
 875                         const char *__restrict __s, size_t __n) __THROW;
 876 /* Convert a wide char string to multibyte string.  */
 877 extern size_t wcstombs (char *__restrict __s,
 878                         const wchar_t *__restrict __pwcs, size_t __n)
 879      __THROW;
 880 __END_NAMESPACE_STD
 881
 882
 883 #ifdef __USE_SVID
 884 /* Determine whether the string value of RESPONSE matches the affirmation
 885    or negative response expression as specified by the LC_MESSAGES category
 886    in the program's current locale.  Returns 1 if affirmative, 0 if
 887    negative, and -1 if not matching.  */
 888 extern int rpmatch (const char *__response) __THROW __nonnull ((1)) __wur;
 889 #endif
 890
 891
 892 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
 893 /* Parse comma separated suboption from *OPTIONP and match against
 894    strings in TOKENS.  If found return index and set *VALUEP to
 895    optional value introduced by an equal sign.  If the suboption is
 896    not part of TOKENS return in *VALUEP beginning of unknown
 897    suboption.  On exit *OPTIONP is set to the beginning of the next
 898    token or at the terminating NUL character.  */
 899 extern int getsubopt (char **__restrict __optionp,
 900                       char *const *__restrict __tokens,
 901                       char **__restrict __valuep)
 902      __THROW __nonnull ((1, 2, 3)) __wur;
 903 #endif
 904
 905
 906 #ifdef __USE_XOPEN
 907 /* Setup DES tables according KEY.  */
 908 extern void setkey (const char *__key) __THROW __nonnull ((1));
 909 #endif
 910
 911
 912 /* X/Open pseudo terminal handling.  */
 913
 914 #ifdef __USE_XOPEN2KXSI
 915 /* Return a master pseudo-terminal handle.  */
 916 extern int posix_openpt (int __oflag) __wur;
 917 #endif
 918
 919 #ifdef __USE_XOPEN
 920 /* The next four functions all take a master pseudo-tty fd and
 921    perform an operation on the associated slave:  */
 922
 923 /* Chown the slave to the calling user.  */
 924 extern int grantpt (int __fd) __THROW;
 925
 926 /* Release an internal lock so the slave can be opened.
 927    Call after grantpt().  */
 928 extern int unlockpt (int __fd) __THROW;
 929
 930 /* Return the pathname of the pseudo terminal slave associated with
 931    the master FD is open on, or NULL on errors.
 932    The returned storage is good until the next call to this function.  */
 933 extern char *ptsname (int __fd) __THROW __wur;
 934 #endif
 935
 936 #ifdef __USE_GNU
 937 /* Store at most BUFLEN characters of the pathname of the slave pseudo
 938    terminal associated with the master FD is open on in BUF.
 939    Return 0 on success, otherwise an error number.  */
 940 extern int ptsname_r (int __fd, char *__buf, size_t __buflen)
 941      __THROW __nonnull ((2));
 942
 943 /* Open a master pseudo terminal and return its file descriptor.  */
 944 extern int getpt (void);
 945 #endif
 946
 947 #ifdef __USE_BSD
 948 /* Put the 1 minute, 5 minute and 15 minute load averages into the first
 949    NELEM elements of LOADAVG.  Return the number written (never more than
 950    three, but may be less than NELEM), or -1 if an error occurred.  */
 951 extern int getloadavg (double __loadavg[], int __nelem)
 952      __THROW __nonnull ((1));
 953 #endif
 954
 955 #include <bits/stdlib-float.h>
 956
 957 /* Define some macros helping to catch buffer overflows.  */
 958 #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
 959 # include <bits/stdlib.h>
 960 #endif
 961 #ifdef __LDBL_COMPAT
 962 # include <bits/stdlib-ldbl.h>
 963 #endif
 964
 965 #endif /* don't just need malloc and calloc */
 966 #undef __need_malloc_and_calloc
 967
 968 __END_DECLS
 969
 970 #endif /* stdlib.h  */