stdlib/stdlib.h

   1 /* Copyright (C) 1991,92,93,94,95,96,97,98 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 /*
  20  *      ISO C Standard: 4.10 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 # define        __need_wchar_t
  31 # define        __need_NULL
  32 #endif
  33 #include <stddef.h>
  34
  35 __BEGIN_DECLS
  36
  37 #ifndef __need_malloc_and_calloc
  38 #define _STDLIB_H       1
  39
  40 /* Returned by `div'.  */
  41 typedef struct
  42   {
  43     int quot;                   /* Quotient.  */
  44     int rem;                    /* Remainder.  */
  45   } div_t;
  46
  47 /* Returned by `ldiv'.  */
  48 typedef struct
  49   {
  50     long int quot;              /* Quotient.  */
  51     long int rem;               /* Remainder.  */
  52   } ldiv_t;
  53
  54 #ifdef __USE_ISOC9X
  55 /* Returned by `lldiv'.  */
  56 __extension__ typedef struct
  57   {
  58     long long int quot;         /* Quotient.  */
  59     long long int rem;          /* Remainder.  */
  60   } lldiv_t;
  61 #endif
  62
  63
  64 /* The largest number rand will return (same as INT_MAX).  */
  65 #define RAND_MAX        2147483647
  66
  67
  68 /* We define these the same for all machines.
  69    Changes from this to the outside world should be done in `_exit'.  */
  70 #define EXIT_FAILURE    1       /* Failing exit status.  */
  71 #define EXIT_SUCCESS    0       /* Successful exit status.  */
  72
  73
  74 /* Maximum length of a multibyte character in the current locale.  */
  75 #define MB_CUR_MAX      (__ctype_get_mb_cur_max ())
  76 extern int __ctype_get_mb_cur_max __P ((void));
  77
  78
  79 /* Convert a string to a floating-point number.  */
  80 extern double atof __P ((__const char *__nptr));
  81 /* Convert a string to an integer.  */
  82 extern int atoi __P ((__const char *__nptr));
  83 /* Convert a string to a long integer.  */
  84 extern long int atol __P ((__const char *__nptr));
  85
  86 #if defined __USE_ISOC9X || (defined __GNUC__ && defined __USE_MISC)
  87 /* These functions will part of the standard C library in ISO C 9X.  */
  88 __extension__ extern long long int atoll __P ((__const char *__nptr));
  89 #endif
  90
  91 /* Convert a string to a floating-point number.  */
  92 extern double strtod __P ((__const char *__restrict __nptr,
  93                            char **__restrict __endptr));
  94
  95 #ifdef  __USE_ISOC9X
  96 /* Likewise for `float' and `long double' sizes of floating-point numbers.  */
  97 extern float strtof __P ((__const char *__restrict __nptr,
  98                           char **__restrict __endptr));
  99
 100 extern __long_double_t strtold __P ((__const char *__restrict __nptr,
 101                                      char **__restrict __endptr));
 102 #endif
 103
 104 /* Convert a string to a long integer.  */
 105 extern long int strtol __P ((__const char *__restrict __nptr,
 106                              char **__restrict __endptr, int __base));
 107 /* Convert a string to an unsigned long integer.  */
 108 extern unsigned long int strtoul __P ((__const char *__restrict __nptr,
 109                                        char **__restrict __endptr,
 110                                        int __base));
 111
 112 #if defined __GNUC__ && defined __USE_BSD
 113 /* Convert a string to a quadword integer.  */
 114 __extension__
 115 extern long long int strtoq __P ((__const char *__restrict __nptr,
 116                                   char **__restrict __endptr, int __base));
 117 /* Convert a string to an unsigned quadword integer.  */
 118 __extension__
 119 extern unsigned long long int strtouq __P ((__const char *__restrict __nptr,
 120                                             char **__restrict __endptr,
 121                                             int __base));
 122 #endif /* GCC and use BSD.  */
 123
 124 #if defined __USE_ISOC9X || (defined __GNUC__ && defined __USE_MISC)
 125 /* These functions will part of the standard C library in ISO C 9X.  */
 126
 127 /* Convert a string to a quadword integer.  */
 128 __extension__
 129 extern long long int strtoll __P ((__const char *__restrict __nptr,
 130                                    char **__restrict __endptr, int __base));
 131 /* Convert a string to an unsigned quadword integer.  */
 132 __extension__
 133 extern unsigned long long int strtoull __P ((__const char *__restrict __nptr,
 134                                              char **__restrict __endptr,
 135                                              int __base));
 136 #endif /* ISO C 9X or GCC and use MISC.  */
 137
 138
 139 #ifdef __USE_GNU
 140 /* The concept of one static locale per category is not very well
 141    thought out.  Many applications will need to process its data using
 142    information from several different locales.  Another application is
 143    the implementation of the internationalization handling in the
 144    upcoming ISO C++ standard library.  To support this another set of
 145    the functions using locale data exist which have an additional
 146    argument.
 147
 148    Attention: all these functions are *not* standardized in any form.
 149    This is a proof-of-concept implementation.  */
 150
 151 /* Structure for reentrant locale using functions.  This is an
 152    (almost) opaque type for the user level programs.  */
 153 # include <xlocale.h>
 154
 155 /* Special versions of the functions above which take the locale to
 156    use as an additional parameter.  */
 157 extern long int __strtol_l __P ((__const char *__restrict __nptr,
 158                                  char **__restrict __endptr, int __base,
 159                                  __locale_t __loc));
 160
 161 extern unsigned long int __strtoul_l __P ((__const char *__restrict __nptr,
 162                                            char **__restrict __endptr,
 163                                            int __base, __locale_t __loc));
 164
 165 __extension__
 166 extern long long int __strtoll_l __P ((__const char *__restrict __nptr,
 167                                        char **__restrict __endptr, int __base,
 168                                        __locale_t __loc));
 169
 170 __extension__
 171 extern unsigned long long int __strtoull_l __P ((__const char *__restrict
 172                                                  __nptr,
 173                                                  char **__restrict __endptr,
 174                                                  int __base,
 175                                                  __locale_t __loc));
 176
 177 extern double __strtod_l __P ((__const char *__restrict __nptr,
 178                                char **__restrict __endptr, __locale_t __loc));
 179
 180 extern float __strtof_l __P ((__const char *__restrict __nptr,
 181                               char **__restrict __endptr, __locale_t __loc));
 182
 183 extern __long_double_t __strtold_l __P ((__const char *__restrict __nptr,
 184                                          char **__restrict __endptr,
 185                                          __locale_t __loc));
 186 #endif /* GNU */
 187
 188
 189 /* The internal entry points for `strtoX' take an extra flag argument
 190    saying whether or not to parse locale-dependent number grouping.  */
 191
 192 extern double __strtod_internal __P ((__const char *__restrict __nptr,
 193                                       char **__restrict __endptr,
 194                                       int __group));
 195 extern float __strtof_internal __P ((__const char *__restrict __nptr,
 196                                      char **__restrict __endptr, int __group));
 197 extern __long_double_t __strtold_internal __P ((__const char *
 198                                                 __restrict __nptr,
 199                                                 char **__restrict __endptr,
 200                                                 int __group));
 201 #ifndef __strtol_internal_defined
 202 extern long int __strtol_internal __P ((__const char *__restrict __nptr,
 203                                         char **__restrict __endptr,
 204                                         int __base, int __group));
 205 # define __strtol_internal_defined      1
 206 #endif
 207 #ifndef __strtoul_internal_defined
 208 extern unsigned long int __strtoul_internal __P ((__const char *
 209                                                   __restrict __nptr,
 210                                                   char **__restrict __endptr,
 211                                                   int __base, int __group));
 212 # define __strtoul_internal_defined     1
 213 #endif
 214 #if defined __GNUC__ || defined __USE_ISOC9X
 215 # ifndef __strtoll_internal_defined
 216 __extension__
 217 extern long long int __strtoll_internal __P ((__const char *__restrict __nptr,
 218                                               char **__restrict __endptr,
 219                                               int __base, int __group));
 220 #  define __strtoll_internal_defined    1
 221 # endif
 222 # ifndef __strtoull_internal_defined
 223 __extension__
 224 extern unsigned long long int __strtoull_internal __P ((__const char *
 225                                                         __restrict __nptr,
 226                                                         char **
 227                                                         __restrict __endptr,
 228                                                         int __base,
 229                                                         int __group));
 230 #  define __strtoull_internal_defined   1
 231 # endif
 232 #endif /* GCC */
 233
 234 #if defined __OPTIMIZE__ && !defined __OPTIMIZE_SIZE__ \
 235     && defined __USE_EXTERN_INLINES
 236 /* Define inline functions which call the internal entry points.  */
 237
 238 extern __inline double
 239 strtod (__const char *__restrict __nptr, char **__restrict __endptr) __THROW
 240 {
 241   return __strtod_internal (__nptr, __endptr, 0);
 242 }
 243 extern __inline long int
 244 strtol (__const char *__restrict __nptr, char **__restrict __endptr,
 245         int __base) __THROW
 246 {
 247   return __strtol_internal (__nptr, __endptr, __base, 0);
 248 }
 249 extern __inline unsigned long int
 250 strtoul (__const char *__restrict __nptr, char **__restrict __endptr,
 251          int __base) __THROW
 252 {
 253   return __strtoul_internal (__nptr, __endptr, __base, 0);
 254 }
 255
 256 # ifdef __USE_ISOC9X
 257 extern __inline float
 258 strtof (__const char *__restrict __nptr, char **__restrict __endptr) __THROW
 259 {
 260   return __strtof_internal (__nptr, __endptr, 0);
 261 }
 262 extern __inline __long_double_t
 263 strtold (__const char *__restrict __nptr, char **__restrict __endptr) __THROW
 264 {
 265   return __strtold_internal (__nptr, __endptr, 0);
 266 }
 267 # endif
 268
 269 # ifdef __USE_BSD
 270 __extension__ extern __inline long long int
 271 strtoq (__const char *__restrict __nptr, char **__restrict __endptr,
 272         int __base) __THROW
 273 {
 274   return __strtoll_internal (__nptr, __endptr, __base, 0);
 275 }
 276 __extension__ extern __inline unsigned long long int
 277 strtouq (__const char *__restrict __nptr, char **__restrict __endptr,
 278          int __base) __THROW
 279 {
 280   return __strtoull_internal (__nptr, __endptr, __base, 0);
 281 }
 282 # endif
 283
 284 # if defined __USE_MISC || defined __USE_ISOC9X
 285 __extension__ extern __inline long long int
 286 strtoll (__const char *__restrict __nptr, char **__restrict __endptr,
 287          int __base) __THROW
 288 {
 289   return __strtoll_internal (__nptr, __endptr, __base, 0);
 290 }
 291 __extension__ extern __inline unsigned long long int
 292 strtoull (__const char * __restrict __nptr, char **__restrict __endptr,
 293           int __base) __THROW
 294 {
 295   return __strtoull_internal (__nptr, __endptr, __base, 0);
 296 }
 297 # endif
 298
 299 extern __inline double
 300 atof (__const char *__nptr) __THROW
 301 {
 302   return strtod (__nptr, (char **) NULL);
 303 }
 304 extern __inline int
 305 atoi (__const char *__nptr) __THROW
 306 {
 307   return (int) strtol (__nptr, (char **) NULL, 10);
 308 }
 309 extern __inline long int
 310 atol (__const char *__nptr) __THROW
 311 {
 312   return strtol (__nptr, (char **) NULL, 10);
 313 }
 314
 315 # if defined __USE_MISC || defined __USE_ISOC9X
 316 __extension__ extern __inline long long int
 317 atoll (__const char *__nptr) __THROW
 318 {
 319   return strtoll (__nptr, (char **) NULL, 10);
 320 }
 321 # endif
 322 #endif /* Optimizing and Inlining.  */
 323
 324
 325 #if defined __USE_SVID || defined __USE_XOPEN_EXTENDED
 326 /* Convert N to base 64 using the digits "./0-9A-Za-z", least-significant
 327    digit first.  Returns a pointer to static storage overwritten by the
 328    next call.  */
 329 extern char *l64a __P ((long int __n));
 330
 331 /* Read a number from a string S in base 64 as above.  */
 332 extern long int a64l __P ((__const char *__s));
 333
 334
 335 # include <sys/types.h> /* we need int32_t... */
 336
 337 /* These are the functions that actually do things.  The `random', `srandom',
 338    `initstate' and `setstate' functions are those from BSD Unices.
 339    The `rand' and `srand' functions are required by the ANSI standard.
 340    We provide both interfaces to the same random number generator.  */
 341 /* Return a random long integer between 0 and RAND_MAX inclusive.  */
 342 extern int32_t random __P ((void));
 343
 344 /* Seed the random number generator with the given number.  */
 345 extern void srandom __P ((unsigned int __seed));
 346
 347 /* Initialize the random number generator to use state buffer STATEBUF,
 348    of length STATELEN, and seed it with SEED.  Optimal lengths are 8, 16,
 349    32, 64, 128 and 256, the bigger the better; values less than 8 will
 350    cause an error and values greater than 256 will be rounded down.  */
 351 extern __ptr_t initstate __P ((unsigned int __seed, __ptr_t __statebuf,
 352                                size_t __statelen));
 353
 354 /* Switch the random number generator to state buffer STATEBUF,
 355    which should have been previously initialized by `initstate'.  */
 356 extern __ptr_t setstate __P ((__ptr_t __statebuf));
 357
 358
 359 # ifdef __USE_MISC
 360 /* Reentrant versions of the `random' family of functions.
 361    These functions all use the following data structure to contain
 362    state, rather than global state variables.  */
 363
 364 struct random_data
 365   {
 366     int32_t *fptr;              /* Front pointer.  */
 367     int32_t *rptr;              /* Rear pointer.  */
 368     int32_t *state;             /* Array of state values.  */
 369     int rand_type;              /* Type of random number generator.  */
 370     int rand_deg;               /* Degree of random number generator.  */
 371     int rand_sep;               /* Distance between front and rear.  */
 372     int32_t *end_ptr;           /* Pointer behind state table.  */
 373   };
 374
 375 extern int random_r __P ((struct random_data *__restrict __buf,
 376                           int32_t *__restrict __result));
 377
 378 extern int srandom_r __P ((unsigned int __seed, struct random_data *__buf));
 379
 380 extern int initstate_r __P ((unsigned int __seed,
 381                              __ptr_t __restrict __statebuf,
 382                              size_t __statelen,
 383                              struct random_data *__restrict __buf));
 384
 385 extern int setstate_r __P ((__ptr_t __restrict __statebuf,
 386                             struct random_data *__restrict __buf));
 387 # endif /* Use misc.  */
 388 #endif  /* Use SVID || extended X/Open.  */
 389
 390
 391 /* Return a random integer between 0 and RAND_MAX inclusive.  */
 392 extern int rand __P ((void));
 393 /* Seed the random number generator with the given number.  */
 394 extern void srand __P ((unsigned int __seed));
 395
 396 #ifdef __USE_POSIX
 397 /* Reentrant interface according to POSIX.1.  */
 398 extern int rand_r __P ((unsigned int *__seed));
 399 #endif
 400
 401
 402 #if defined __USE_SVID || defined __USE_XOPEN
 403 /* System V style 48-bit random number generator functions.  */
 404
 405 /* Return non-negative, double-precision floating-point value in [0.0,1.0).  */
 406 extern double drand48 __P ((void));
 407 extern double erand48 __P ((unsigned short int __xsubi[3]));
 408
 409 /* Return non-negative, long integer in [0,2^31).  */
 410 extern long int lrand48 __P ((void));
 411 extern long int nrand48 __P ((unsigned short int __xsubi[3]));
 412
 413 /* Return signed, long integers in [-2^31,2^31).  */
 414 extern long int mrand48 __P ((void));
 415 extern long int jrand48 __P ((unsigned short int __xsubi[3]));
 416
 417 /* Seed random number generator.  */
 418 extern void srand48 __P ((long int __seedval));
 419 extern unsigned short int *seed48 __P ((unsigned short int __seed16v[3]));
 420 extern void lcong48 __P ((unsigned short int __param[7]));
 421
 422 /* Data structure for communication with thread safe versions.  */
 423 struct drand48_data
 424   {
 425     unsigned short int x[3];    /* Current state.  */
 426     unsigned short int a[3];    /* Factor in congruential formula.  */
 427     unsigned short int c;       /* Additive const. in congruential formula.  */
 428     unsigned short int old_x[3]; /* Old state.  */
 429     int init;                   /* Flag for initializing.  */
 430   };
 431
 432 # ifdef __USE_MISC
 433 /* Return non-negative, double-precision floating-point value in [0.0,1.0).  */
 434 extern int drand48_r __P ((struct drand48_data *__restrict __buffer,
 435                            double *__restrict __result));
 436 extern int erand48_r __P ((unsigned short int __xsubi[3],
 437                            struct drand48_data *__restrict __buffer,
 438                            double *__restrict __result));
 439
 440 /* Return non-negative, long integer in [0,2^31).  */
 441 extern int lrand48_r __P ((struct drand48_data *__restrict __buffer,
 442                            long int *__restrict __result));
 443 extern int nrand48_r __P ((unsigned short int __xsubi[3],
 444                            struct drand48_data *__restrict __buffer,
 445                            long int *__restrict __result));
 446
 447 /* Return signed, long integers in [-2^31,2^31).  */
 448 extern int mrand48_r __P ((struct drand48_data *__restrict __buffer,
 449                            long int *__restrict __result));
 450 extern int jrand48_r __P ((unsigned short int __xsubi[3],
 451                            struct drand48_data *__restrict __buffer,
 452                            long int *__restrict __result));
 453
 454 /* Seed random number generator.  */
 455 extern int srand48_r __P ((long int __seedval, struct drand48_data *__buffer));
 456
 457 extern int seed48_r __P ((unsigned short int __seed16v[3],
 458                           struct drand48_data *__buffer));
 459
 460 extern int lcong48_r __P ((unsigned short int __param[7],
 461                            struct drand48_data *__buffer));
 462 # endif /* Use misc.  */
 463 #endif  /* Use SVID or X/Open.  */
 464
 465 #endif /* don't just need malloc and calloc */
 466
 467 #ifndef __malloc_and_calloc_defined
 468 #define __malloc_and_calloc_defined
 469 /* Allocate SIZE bytes of memory.  */
 470 extern __ptr_t malloc __P ((size_t __size));
 471 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
 472 extern __ptr_t calloc __P ((size_t __nmemb, size_t __size));
 473 #endif
 474
 475 #ifndef __need_malloc_and_calloc
 476 /* Re-allocate the previously allocated block
 477    in __ptr_t, making the new block SIZE bytes long.  */
 478 extern __ptr_t realloc __P ((__ptr_t __ptr, size_t __size));
 479 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
 480 extern void free __P ((__ptr_t __ptr));
 481
 482 #ifdef  __USE_MISC
 483 /* Free a block.  An alias for `free'.  (Sun Unices).  */
 484 extern void cfree __P ((__ptr_t __ptr));
 485 #endif /* Use misc.  */
 486
 487 #if defined __USE_GNU || defined __USE_BSD || defined __USE_MISC
 488 # include <alloca.h>
 489 #endif /* Use GNU, BSD, or misc.  */
 490
 491 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 492 /* Allocate SIZE bytes on a page boundary.  The storage cannot be freed.  */
 493 extern __ptr_t valloc __P ((size_t __size));
 494 #endif
 495
 496
 497 /* Abort execution and generate a core-dump.  */
 498 extern void abort __P ((void)) __attribute__ ((__noreturn__));
 499
 500
 501 /* Register a function to be called when `exit' is called.  */
 502 extern int atexit __P ((void (*__func) (void)));
 503
 504 #ifdef  __USE_MISC
 505 /* Register a function to be called with the status
 506    given to `exit' and the given argument.  */
 507 extern int __on_exit __P ((void (*__func) (int __status, __ptr_t __arg),
 508                            __ptr_t __arg));
 509 extern int on_exit __P ((void (*__func) (int __status, __ptr_t __arg),
 510                          __ptr_t __arg));
 511 #endif
 512
 513 /* Call all functions registered with `atexit' and `on_exit',
 514    in the reverse of the order in which they were registered
 515    perform stdio cleanup, and terminate program execution with STATUS.  */
 516 extern void exit __P ((int __status)) __attribute__ ((__noreturn__));
 517
 518
 519 /* Return the value of envariable NAME, or NULL if it doesn't exist.  */
 520 extern char *getenv __P ((__const char *__name));
 521
 522 /* This function is similar to the above but returns NULL if the
 523    programs is running with SUID or SGID enabled.  */
 524 extern char *__secure_getenv __P ((__const char *__name));
 525
 526 #if defined __USE_SVID || defined __USE_XOPEN
 527 /* The SVID says this is in <stdio.h>, but this seems a better place.   */
 528 /* Put STRING, which is of the form "NAME=VALUE", in the environment.
 529    If there is no `=', remove NAME from the environment.  */
 530 extern int putenv __P ((__const char *__string));
 531 #endif
 532
 533 #ifdef  __USE_BSD
 534 /* Set NAME to VALUE in the environment.
 535    If REPLACE is nonzero, overwrite an existing value.  */
 536 extern int setenv __P ((__const char *__name, __const char *__value,
 537                         int __replace));
 538
 539 /* Remove the variable NAME from the environment.  */
 540 extern void unsetenv __P ((__const char *__name));
 541 #endif
 542
 543 #ifdef  __USE_MISC
 544 /* The `clearenv' was planned to be added to POSIX.1 but probably
 545    never made it.  Nevertheless the POSIX.9 standard (POSIX bindings
 546    for Fortran 77) requires this function.  */
 547 extern int clearenv __P ((void));
 548 #endif
 549
 550
 551 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
 552 /* Generate a unique temporary file name from TEMPLATE.
 553    The last six characters of TEMPLATE must be "XXXXXX";
 554    they are replaced with a string that makes the file name unique.
 555    Returns TEMPLATE, or a null pointer if it cannot get a unique file name.  */
 556 extern char *mktemp __P ((char *__template));
 557
 558 /* Generate a unique temporary file name from TEMPLATE.
 559    The last six characters of TEMPLATE must be "XXXXXX";
 560    they are replaced with a string that makes the filename unique.
 561    Returns a file descriptor open on the file for reading and writing,
 562    or -1 if it cannot create a uniquely-named file.  */
 563 extern int mkstemp __P ((char *__template));
 564 #endif
 565
 566
 567 /* Execute the given line as a shell command.  */
 568 extern int system __P ((__const char *__command));
 569
 570
 571 #ifdef  __USE_GNU
 572 /* Return a malloc'd string containing the canonical absolute name of the
 573    named file.  The last file name component need not exist, and may be a
 574    symlink to a nonexistent file.  */
 575 extern char *canonicalize_file_name __P ((__const char *__name));
 576 #endif
 577
 578 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 579 /* Return the canonical absolute name of file NAME.  The last file name
 580    component need not exist, and may be a symlink to a nonexistent file.
 581    If RESOLVED is null, the result is malloc'd; otherwise, if the canonical
 582    name is PATH_MAX chars or more, returns null with `errno' set to
 583    ENAMETOOLONG; if the name fits in fewer than PATH_MAX chars, returns the
 584    name in RESOLVED.  */
 585 extern char *realpath __P ((__const char *__restrict __name,
 586                             char *__restrict __resolved));
 587 #endif
 588
 589
 590 /* Shorthand for type of comparison functions.  */
 591 #ifndef __COMPAR_FN_T
 592 # define __COMPAR_FN_T
 593 typedef int (*__compar_fn_t) __PMT ((__const __ptr_t, __const __ptr_t));
 594
 595 # ifdef __USE_GNU
 596 typedef __compar_fn_t comparison_fn_t;
 597 # endif
 598 #endif
 599
 600 /* Do a binary search for KEY in BASE, which consists of NMEMB elements
 601    of SIZE bytes each, using COMPAR to perform the comparisons.  */
 602 extern __ptr_t bsearch __PMT ((__const __ptr_t __key, __const __ptr_t __base,
 603                                size_t __nmemb, size_t __size,
 604                                __compar_fn_t __compar));
 605
 606 /* Sort NMEMB elements of BASE, of SIZE bytes each,
 607    using COMPAR to perform the comparisons.  */
 608 extern void qsort __PMT ((__ptr_t __base, size_t __nmemb, size_t __size,
 609                           __compar_fn_t __compar));
 610
 611
 612 /* Return the absolute value of X.  */
 613 extern int abs __P ((int __x)) __attribute__ ((__const__));
 614 extern long int labs __P ((long int __x)) __attribute__ ((__const__));
 615 #ifdef __USE_ISOC9X
 616 __extension__ extern long long int llabs __P ((long long int __x))
 617      __attribute__ ((__const__));
 618 #endif
 619
 620
 621 /* Return the `div_t', `ldiv_t' or `lldiv_t' representation
 622    of the value of NUMER over DENOM. */
 623 /* GCC may have built-ins for these someday.  */
 624 extern div_t div __P ((int __numer, int __denom)) __attribute__ ((__const__));
 625 extern ldiv_t ldiv __P ((long int __numer, long int __denom))
 626      __attribute__ ((__const__));
 627 #ifdef __USE_ISOC9X
 628 __extension__ extern lldiv_t lldiv __P ((long long int __numer,
 629                                          long long int __denom))
 630      __attribute__ ((__const__));
 631 #endif
 632
 633
 634 #if defined __USE_SVID || defined __USE_XOPEN_EXTENDED
 635 /* Convert floating point numbers to strings.  The returned values are
 636    valid only until another call to the same function.  */
 637
 638 /* Convert VALUE to a string with NDIGIT digits and return a pointer to
 639    this.  Set *DECPT with the position of the decimal character and *SIGN
 640    with the sign of the number.  */
 641 extern char *ecvt __P ((double __value, int __ndigit, int *__restrict __decpt,
 642                         int *__restrict __sign));
 643
 644 /* Convert VALUE to a string rounded to NDIGIT decimal digits.  Set *DECPT
 645    with the position of the decimal character and *SIGN with the sign of
 646    the number.  */
 647 extern char *fcvt __P ((double __value, int __ndigit, int *__restrict __decpt,
 648                         int *__restrict __sign));
 649
 650 /* If possible convert VALUE to a string with NDIGIT significant digits.
 651    Otherwise use exponential representation.  The resulting string will
 652    be written to BUF.  */
 653 extern char *gcvt __P ((double __value, int __ndigit, char *__buf));
 654
 655 /* Long double versions of above functions.  */
 656 extern char *qecvt __P ((__long_double_t __value, int __ndigit,
 657                          int *__restrict __decpt, int *__restrict __sign));
 658 extern char *qfcvt __P ((__long_double_t __value, int __ndigit,
 659                          int *__restrict __decpt, int *__restrict __sign));
 660 extern char *qgcvt __P ((__long_double_t __value, int __ndigit, char *__buf));
 661
 662
 663 # ifdef __USE_MISC
 664 /* Reentrant version of the functions above which provide their own
 665    buffers.  */
 666 extern int ecvt_r __P ((double __value, int __ndigit, int *__restrict __decpt,
 667                         int *__restrict __sign, char *__restrict __buf,
 668                         size_t __len));
 669 extern int fcvt_r __P ((double __value, int __ndigit, int *__restrict __decpt,
 670                         int *__restrict __sign, char *__restrict __buf,
 671                         size_t __len));
 672
 673 extern int qecvt_r __P ((__long_double_t __value, int __ndigit,
 674                          int *__restrict __decpt, int *__restrict __sign,
 675                          char *__restrict __buf, size_t __len));
 676 extern int qfcvt_r __P ((__long_double_t __value, int __ndigit,
 677                          int *__restrict __decpt, int *__restrict __sign,
 678                          char *__restrict __buf, size_t __len));
 679 # endif /* misc */
 680 #endif  /* use MISC || use X/Open Unix */
 681
 682
 683 /* Return the length of the multibyte character
 684    in S, which is no longer than N.  */
 685 extern int mblen __P ((__const char *__s, size_t __n));
 686 /* Return the length of the given multibyte character,
 687    putting its `wchar_t' representation in *PWC.  */
 688 extern int mbtowc __P ((wchar_t *__restrict __pwc,
 689                         __const char *__restrict __s, size_t __n));
 690 /* Put the multibyte character represented
 691    by WCHAR in S, returning its length.  */
 692 extern int wctomb __P ((char *__s, wchar_t __wchar));
 693
 694
 695 /* Convert a multibyte string to a wide char string.  */
 696 extern size_t mbstowcs __P ((wchar_t *__restrict  __pwcs,
 697                              __const char *__restrict __s, size_t __n));
 698 /* Convert a wide char string to multibyte string.  */
 699 extern size_t wcstombs __P ((char *__restrict __s,
 700                              __const wchar_t *__restrict __pwcs, size_t __n));
 701
 702
 703 #ifdef __USE_SVID
 704 /* Determine whether the string value of RESPONSE matches the affirmation
 705    or negative response expression as specified by the LC_MESSAGES category
 706    in the program's current locale.  Returns 1 if affirmative, 0 if
 707    negative, and -1 if not matching.  */
 708 extern int rpmatch __P ((__const char *__response));
 709 #endif
 710
 711
 712 #ifdef __USE_XOPEN_EXTENDED
 713 /* Parse comma separated suboption from *OPTIONP and match against
 714    strings in TOKENS.  If found return index and set *VALUEP to
 715    optional value introduced by an equal sign.  If the suboption is
 716    not part of TOKENS return in *VALUEP beginning of unknown
 717    suboption.  On exit *OPTIONP is set to the beginning of the next
 718    token or at the terminating NUL character.  */
 719 extern int getsubopt __P ((char **__restrict __optionp,
 720                            __const char *__const *__restrict __tokens,
 721                            char **__restrict __valuep));
 722 #endif
 723
 724
 725 #ifdef __USE_XOPEN
 726
 727 /* Setup DES tables according KEY.  */
 728 extern void setkey __P ((__const char *__key));
 729
 730 /* X/Open pseudo terminal handling.  */
 731
 732 /* The next four functions all take a master pseudo-tty fd and
 733    perform an operation on the associated slave:  */
 734
 735 /* Chown the slave to the calling user.  */
 736 extern int grantpt __P ((int __fd));
 737
 738 /* Release an internal lock so the slave can be opened.
 739    Call after grantpt().  */
 740 extern int unlockpt __P ((int __fd));
 741
 742 /* Return the pathname of the pseudo terminal slave assoicated with
 743    the master FD is open on, or NULL on errors.
 744    The returned storage is good until the next call to this function.  */
 745 extern char *ptsname __P ((int __fd));
 746 #endif
 747
 748 #ifdef __USE_GNU
 749 /* Store at most BUFLEN characters of the pathname of the slave pseudo
 750    terminal associated with the master FD is open on in BUF.
 751    Return 0 on success, otherwise an error number.  */
 752 extern int ptsname_r __P ((int __fd, char *__buf, size_t __buflen));
 753
 754 /* Open a master pseudo terminal and return its file descriptor.  */
 755 extern int getpt __P ((void));
 756 #endif
 757
 758 #endif /* don't just need malloc and calloc */
 759 #undef __need_malloc_and_calloc
 760
 761 __END_DECLS
 762
 763 #endif /* stdlib.h  */