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 *__buf, int32_t *__result));
 376
 377 extern int srandom_r __P ((unsigned int __seed, struct random_data *__buf));
 378
 379 extern int initstate_r __P ((unsigned int __seed, __ptr_t __statebuf,
 380                              size_t __statelen, struct random_data *__buf));
 381
 382 extern int setstate_r __P ((__ptr_t __statebuf, struct random_data *__buf));
 383 # endif /* Use misc.  */
 384 #endif  /* Use SVID || extended X/Open.  */
 385
 386
 387 /* Return a random integer between 0 and RAND_MAX inclusive.  */
 388 extern int rand __P ((void));
 389 /* Seed the random number generator with the given number.  */
 390 extern void srand __P ((unsigned int __seed));
 391
 392 #ifdef __USE_POSIX
 393 /* Reentrant interface according to POSIX.1.  */
 394 extern int rand_r __P ((unsigned int *__seed));
 395 #endif
 396
 397
 398 #if defined __USE_SVID || defined __USE_XOPEN
 399 /* System V style 48-bit random number generator functions.  */
 400
 401 /* Return non-negative, double-precision floating-point value in [0.0,1.0).  */
 402 extern double drand48 __P ((void));
 403 extern double erand48 __P ((unsigned short int __xsubi[3]));
 404
 405 /* Return non-negative, long integer in [0,2^31).  */
 406 extern long int lrand48 __P ((void));
 407 extern long int nrand48 __P ((unsigned short int __xsubi[3]));
 408
 409 /* Return signed, long integers in [-2^31,2^31).  */
 410 extern long int mrand48 __P ((void));
 411 extern long int jrand48 __P ((unsigned short int __xsubi[3]));
 412
 413 /* Seed random number generator.  */
 414 extern void srand48 __P ((long int __seedval));
 415 extern unsigned short int *seed48 __P ((unsigned short int __seed16v[3]));
 416 extern void lcong48 __P ((unsigned short int __param[7]));
 417
 418 /* Data structure for communication with thread safe versions.  */
 419 struct drand48_data
 420   {
 421     unsigned short int x[3];    /* Current state.  */
 422     unsigned short int a[3];    /* Factor in congruential formula.  */
 423     unsigned short int c;       /* Additive const. in congruential formula.  */
 424     unsigned short int old_x[3]; /* Old state.  */
 425     int init;                   /* Flag for initializing.  */
 426   };
 427
 428 # ifdef __USE_MISC
 429 /* Return non-negative, double-precision floating-point value in [0.0,1.0).  */
 430 extern int drand48_r __P ((struct drand48_data *__buffer, double *__result));
 431 extern int erand48_r __P ((unsigned short int __xsubi[3],
 432                            struct drand48_data *__buffer, double *__result));
 433
 434 /* Return non-negative, long integer in [0,2^31).  */
 435 extern int lrand48_r __P ((struct drand48_data *__buffer, long int *__result));
 436 extern int nrand48_r __P ((unsigned short int __xsubi[3],
 437                            struct drand48_data *__buffer, long int *__result));
 438
 439 /* Return signed, long integers in [-2^31,2^31).  */
 440 extern int mrand48_r __P ((struct drand48_data *__buffer, long int *__result));
 441 extern int jrand48_r __P ((unsigned short int __xsubi[3],
 442                            struct drand48_data *__buffer, long int *__result));
 443
 444 /* Seed random number generator.  */
 445 extern int srand48_r __P ((long int __seedval, struct drand48_data *__buffer));
 446
 447 extern int seed48_r __P ((unsigned short int __seed16v[3],
 448                           struct drand48_data *__buffer));
 449
 450 extern int lcong48_r __P ((unsigned short int __param[7],
 451                            struct drand48_data *__buffer));
 452 # endif /* Use misc.  */
 453 #endif  /* Use SVID or X/Open.  */
 454
 455 #endif /* don't just need malloc and calloc */
 456
 457 #ifndef __malloc_and_calloc_defined
 458 #define __malloc_and_calloc_defined
 459 /* Allocate SIZE bytes of memory.  */
 460 extern __ptr_t malloc __P ((size_t __size));
 461 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
 462 extern __ptr_t calloc __P ((size_t __nmemb, size_t __size));
 463 #endif
 464
 465 #ifndef __need_malloc_and_calloc
 466 /* Re-allocate the previously allocated block
 467    in __ptr_t, making the new block SIZE bytes long.  */
 468 extern __ptr_t realloc __P ((__ptr_t __ptr, size_t __size));
 469 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
 470 extern void free __P ((__ptr_t __ptr));
 471
 472 #ifdef  __USE_MISC
 473 /* Free a block.  An alias for `free'.  (Sun Unices).  */
 474 extern void cfree __P ((__ptr_t __ptr));
 475 #endif /* Use misc.  */
 476
 477 #if defined __USE_GNU || defined __USE_BSD || defined __USE_MISC
 478 # include <alloca.h>
 479 #endif /* Use GNU, BSD, or misc.  */
 480
 481 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 482 /* Allocate SIZE bytes on a page boundary.  The storage cannot be freed.  */
 483 extern __ptr_t valloc __P ((size_t __size));
 484 #endif
 485
 486
 487 /* Abort execution and generate a core-dump.  */
 488 extern void abort __P ((void)) __attribute__ ((__noreturn__));
 489
 490
 491 /* Register a function to be called when `exit' is called.  */
 492 extern int atexit __P ((void (*__func) (void)));
 493
 494 #ifdef  __USE_MISC
 495 /* Register a function to be called with the status
 496    given to `exit' and the given argument.  */
 497 extern int __on_exit __P ((void (*__func) (int __status, __ptr_t __arg),
 498                            __ptr_t __arg));
 499 extern int on_exit __P ((void (*__func) (int __status, __ptr_t __arg),
 500                          __ptr_t __arg));
 501 #endif
 502
 503 /* Call all functions registered with `atexit' and `on_exit',
 504    in the reverse of the order in which they were registered
 505    perform stdio cleanup, and terminate program execution with STATUS.  */
 506 extern void exit __P ((int __status)) __attribute__ ((__noreturn__));
 507
 508
 509 /* Return the value of envariable NAME, or NULL if it doesn't exist.  */
 510 extern char *getenv __P ((__const char *__name));
 511
 512 /* This function is similar to the above but returns NULL if the
 513    programs is running with SUID or SGID enabled.  */
 514 extern char *__secure_getenv __P ((__const char *__name));
 515
 516 #if defined __USE_SVID || defined __USE_XOPEN
 517 /* The SVID says this is in <stdio.h>, but this seems a better place.   */
 518 /* Put STRING, which is of the form "NAME=VALUE", in the environment.
 519    If there is no `=', remove NAME from the environment.  */
 520 extern int putenv __P ((__const char *__string));
 521 #endif
 522
 523 #ifdef  __USE_BSD
 524 /* Set NAME to VALUE in the environment.
 525    If REPLACE is nonzero, overwrite an existing value.  */
 526 extern int setenv __P ((__const char *__name, __const char *__value,
 527                         int __replace));
 528
 529 /* Remove the variable NAME from the environment.  */
 530 extern void unsetenv __P ((__const char *__name));
 531 #endif
 532
 533 #ifdef  __USE_MISC
 534 /* The `clearenv' was planned to be added to POSIX.1 but probably
 535    never made it.  Nevertheless the POSIX.9 standard (POSIX bindings
 536    for Fortran 77) requires this function.  */
 537 extern int clearenv __P ((void));
 538 #endif
 539
 540
 541 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
 542 /* Generate a unique temporary file name from TEMPLATE.
 543    The last six characters of TEMPLATE must be "XXXXXX";
 544    they are replaced with a string that makes the file name unique.
 545    Returns TEMPLATE, or a null pointer if it cannot get a unique file name.  */
 546 extern char *mktemp __P ((char *__template));
 547
 548 /* Generate a unique temporary file name from TEMPLATE.
 549    The last six characters of TEMPLATE must be "XXXXXX";
 550    they are replaced with a string that makes the filename unique.
 551    Returns a file descriptor open on the file for reading and writing,
 552    or -1 if it cannot create a uniquely-named file.  */
 553 extern int mkstemp __P ((char *__template));
 554 #endif
 555
 556
 557 /* Execute the given line as a shell command.  */
 558 extern int system __P ((__const char *__command));
 559
 560
 561 #ifdef  __USE_GNU
 562 /* Return a malloc'd string containing the canonical absolute name of the
 563    named file.  The last file name component need not exist, and may be a
 564    symlink to a nonexistent file.  */
 565 extern char *canonicalize_file_name __P ((__const char *__name));
 566 #endif
 567
 568 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 569 /* Return the canonical absolute name of file NAME.  The last file name
 570    component need not exist, and may be a symlink to a nonexistent file.
 571    If RESOLVED is null, the result is malloc'd; otherwise, if the canonical
 572    name is PATH_MAX chars or more, returns null with `errno' set to
 573    ENAMETOOLONG; if the name fits in fewer than PATH_MAX chars, returns the
 574    name in RESOLVED.  */
 575 extern char *realpath __P ((__const char *__name, char *__resolved));
 576 #endif
 577
 578
 579 /* Shorthand for type of comparison functions.  */
 580 #ifndef __COMPAR_FN_T
 581 # define __COMPAR_FN_T
 582 typedef int (*__compar_fn_t) __PMT ((__const __ptr_t, __const __ptr_t));
 583
 584 # ifdef __USE_GNU
 585 typedef __compar_fn_t comparison_fn_t;
 586 # endif
 587 #endif
 588
 589 /* Do a binary search for KEY in BASE, which consists of NMEMB elements
 590    of SIZE bytes each, using COMPAR to perform the comparisons.  */
 591 extern __ptr_t bsearch __PMT ((__const __ptr_t __key, __const __ptr_t __base,
 592                                size_t __nmemb, size_t __size,
 593                                __compar_fn_t __compar));
 594
 595 /* Sort NMEMB elements of BASE, of SIZE bytes each,
 596    using COMPAR to perform the comparisons.  */
 597 extern void qsort __PMT ((__ptr_t __base, size_t __nmemb, size_t __size,
 598                           __compar_fn_t __compar));
 599
 600
 601 /* Return the absolute value of X.  */
 602 extern int abs __P ((int __x)) __attribute__ ((__const__));
 603 extern long int labs __P ((long int __x)) __attribute__ ((__const__));
 604 #ifdef __USE_ISOC9X
 605 __extension__ extern long long int llabs __P ((long long int __x))
 606      __attribute__ ((__const__));
 607 #endif
 608
 609
 610 /* Return the `div_t', `ldiv_t' or `lldiv_t' representation
 611    of the value of NUMER over DENOM. */
 612 /* GCC may have built-ins for these someday.  */
 613 extern div_t div __P ((int __numer, int __denom)) __attribute__ ((__const__));
 614 extern ldiv_t ldiv __P ((long int __numer, long int __denom))
 615      __attribute__ ((__const__));
 616 #ifdef __USE_ISOC9X
 617 __extension__ extern lldiv_t lldiv __P ((long long int __numer,
 618                                          long long int __denom))
 619      __attribute__ ((__const__));
 620 #endif
 621
 622
 623 #if defined __USE_SVID || defined __USE_XOPEN_EXTENDED
 624 /* Convert floating point numbers to strings.  The returned values are
 625    valid only until another call to the same function.  */
 626
 627 /* Convert VALUE to a string with NDIGIT digits and return a pointer to
 628    this.  Set *DECPT with the position of the decimal character and *SIGN
 629    with the sign of the number.  */
 630 extern char *ecvt __P ((double __value, int __ndigit, int *__decpt,
 631                         int *__sign));
 632
 633 /* Convert VALUE to a string rounded to NDIGIT decimal digits.  Set *DECPT
 634    with the position of the decimal character and *SIGN with the sign of
 635    the number.  */
 636 extern char *fcvt __P ((double __value, int __ndigit, int *__decpt,
 637                         int *__sign));
 638
 639 /* If possible convert VALUE to a string with NDIGIT significant digits.
 640    Otherwise use exponential representation.  The resulting string will
 641    be written to BUF.  */
 642 extern char *gcvt __P ((double __value, int __ndigit, char *__buf));
 643
 644 /* Long double versions of above functions.  */
 645 extern char *qecvt __P ((__long_double_t __value, int __ndigit, int *__decpt,
 646                          int *__sign));
 647 extern char *qfcvt __P ((__long_double_t __value, int __ndigit, int *__decpt,
 648                          int *__sign));
 649 extern char *qgcvt __P ((__long_double_t __value, int __ndigit, char *__buf));
 650
 651
 652 # ifdef __USE_MISC
 653 /* Reentrant version of the functions above which provide their own
 654    buffers.  */
 655 extern int ecvt_r __P ((double __value, int __ndigit, int *__decpt,
 656                         int *__sign, char *__buf, size_t __len));
 657 extern int fcvt_r __P ((double __value, int __ndigit, int *__decpt,
 658                         int *__sign, char *__buf, size_t __len));
 659
 660 extern int qecvt_r __P ((__long_double_t __value, int __ndigit, int *__decpt,
 661                          int *__sign, char *__buf, size_t __len));
 662 extern int qfcvt_r __P ((__long_double_t __value, int __ndigit, int *__decpt,
 663                          int *__sign, char *__buf, size_t __len));
 664 # endif /* misc */
 665 #endif  /* use MISC || use X/Open Unix */
 666
 667
 668 /* Return the length of the multibyte character
 669    in S, which is no longer than N.  */
 670 extern int mblen __P ((__const char *__s, size_t __n));
 671 /* Return the length of the given multibyte character,
 672    putting its `wchar_t' representation in *PWC.  */
 673 extern int mbtowc __P ((wchar_t *__restrict __pwc,
 674                         __const char *__restrict __s, size_t __n));
 675 /* Put the multibyte character represented
 676    by WCHAR in S, returning its length.  */
 677 extern int wctomb __P ((char *__s, wchar_t __wchar));
 678
 679
 680 /* Convert a multibyte string to a wide char string.  */
 681 extern size_t mbstowcs __P ((wchar_t *__restrict  __pwcs,
 682                              __const char *__restrict __s, size_t __n));
 683 /* Convert a wide char string to multibyte string.  */
 684 extern size_t wcstombs __P ((char *__restrict __s,
 685                              __const wchar_t *__restrict __pwcs, size_t __n));
 686
 687
 688 #ifdef __USE_SVID
 689 /* Determine whether the string value of RESPONSE matches the affirmation
 690    or negative response expression as specified by the LC_MESSAGES category
 691    in the program's current locale.  Returns 1 if affirmative, 0 if
 692    negative, and -1 if not matching.  */
 693 extern int rpmatch __P ((__const char *__response));
 694 #endif
 695
 696
 697 #ifdef __USE_XOPEN_EXTENDED
 698 /* Parse comma separated suboption from *OPTIONP and match against
 699    strings in TOKENS.  If found return index and set *VALUEP to
 700    optional value introduced by an equal sign.  If the suboption is
 701    not part of TOKENS return in *VALUEP beginning of unknown
 702    suboption.  On exit *OPTIONP is set to the beginning of the next
 703    token or at the terminating NUL character.  */
 704 extern int getsubopt __P ((char **__optionp, __const char *__const *__tokens,
 705                            char **__valuep));
 706 #endif
 707
 708
 709 #ifdef __USE_XOPEN
 710
 711 /* Setup DES tables according KEY.  */
 712 extern void setkey __P ((__const char *__key));
 713
 714 /* X/Open pseudo terminal handling.  */
 715
 716 /* The next four functions all take a master pseudo-tty fd and
 717    perform an operation on the associated slave:  */
 718
 719 /* Chown the slave to the calling user.  */
 720 extern int grantpt __P ((int __fd));
 721
 722 /* Release an internal lock so the slave can be opened.
 723    Call after grantpt().  */
 724 extern int unlockpt __P ((int __fd));
 725
 726 /* Return the pathname of the pseudo terminal slave assoicated with
 727    the master FD is open on, or NULL on errors.
 728    The returned storage is good until the next call to this function.  */
 729 extern char *ptsname __P ((int __fd));
 730 #endif
 731
 732 #ifdef __USE_GNU
 733 /* Store at most BUFLEN characters of the pathname of the slave pseudo
 734    terminal associated with the master FD is open on in BUF.
 735    Return 0 on success, otherwise an error number.  */
 736 extern int ptsname_r __P ((int __fd, char *__buf, size_t __buflen));
 737
 738 /* Open a master pseudo terminal and return its file descriptor.  */
 739 extern int getpt __P ((void));
 740 #endif
 741
 742 #endif /* don't just need malloc and calloc */
 743 #undef __need_malloc_and_calloc
 744
 745 __END_DECLS
 746
 747 #endif /* stdlib.h  */