stdio/stdio.h

   1 /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 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: 4.9 INPUT/OUTPUT        <stdio.h>
  21  */
  22
  23 #ifndef _STDIO_H
  24
  25 #if     !defined(__need_FILE)
  26 #define _STDIO_H        1
  27 #include <features.h>
  28
  29 __BEGIN_DECLS
  30
  31 #define __need_size_t
  32 #define __need_NULL
  33 #include <stddef.h>
  34
  35 #define __need___va_list
  36 #include <stdarg.h>
  37 #ifndef __GNUC_VA_LIST
  38 #define __gnuc_va_list  __ptr_t
  39 #endif
  40
  41 #include <bits/types.h>
  42 #endif /* Don't need FILE.  */
  43 #undef  __need_FILE
  44
  45
  46 #ifndef __FILE_defined
  47
  48 /* The opaque type of streams.  */
  49 typedef struct __stdio_file FILE;
  50
  51 #define __FILE_defined  1
  52 #endif /* FILE not defined.  */
  53
  54
  55 #ifdef  _STDIO_H
  56
  57 /* The type of the second argument to `fgetpos' and `fsetpos'.  */
  58 typedef __off_t fpos_t;
  59
  60 /* The mode of I/O, as given in the MODE argument to fopen, etc.  */
  61 typedef struct
  62 {
  63   unsigned int __read:1;        /* Open for reading.  */
  64   unsigned int __write:1;       /* Open for writing.  */
  65   unsigned int __append:1;      /* Open for appending.  */
  66   unsigned int __binary:1;      /* Opened binary.  */
  67   unsigned int __create:1;      /* Create the file.  */
  68   unsigned int __exclusive:1;   /* Error if it already exists.  */
  69   unsigned int __truncate:1;    /* Truncate the file on opening.  */
  70 } __io_mode;
  71
  72
  73 /* Functions to do I/O and file management for a stream.  */
  74
  75 /* Read NBYTES bytes from COOKIE into a buffer pointed to by BUF.
  76    Return number of bytes read.  */
  77 typedef __ssize_t __io_read_fn __P ((__ptr_t __cookie, char *__buf,
  78                                      size_t __nbytes));
  79
  80 /* Write N bytes pointed to by BUF to COOKIE.  Write all N bytes
  81    unless there is an error.  Return number of bytes written, or -1 if
  82    there is an error without writing anything.  If the file has been
  83    opened for append (__mode.__append set), then set the file pointer
  84    to the end of the file and then do the write; if not, just write at
  85    the current file pointer.  */
  86 typedef __ssize_t __io_write_fn __P ((__ptr_t __cookie, __const char *__buf,
  87                                       size_t __n));
  88
  89 /* Move COOKIE's file position to *POS bytes from the
  90    beginning of the file (if W is SEEK_SET),
  91    the current position (if W is SEEK_CUR),
  92    or the end of the file (if W is SEEK_END).
  93    Set *POS to the new file position.
  94    Returns zero if successful, nonzero if not.  */
  95 typedef int __io_seek_fn __P ((__ptr_t __cookie, fpos_t *__pos, int __w));
  96
  97 /* Close COOKIE.  */
  98 typedef int __io_close_fn __P ((__ptr_t __cookie));
  99
 100 /* Return the file descriptor associated with COOKIE,
 101    or -1 on error.  There need not be any associated file descriptor.  */
 102 typedef int __io_fileno_fn __P ((__ptr_t __cookie));
 103
 104 #ifdef __USE_GNU
 105 /* User-visible names for the above.  */
 106 typedef __io_read_fn cookie_read_function_t;
 107 typedef __io_write_fn cookie_write_function_t;
 108 typedef __io_seek_fn cookie_seek_function_t;
 109 typedef __io_close_fn cookie_close_function_t;
 110 typedef __io_fileno_fn cookie_fileno_function_t;
 111 #endif
 112
 113 /* Low level interface, independent of FILE representation.  */
 114 #if defined __USE_GNU && !defined _LIBC
 115 /* Define the user-visible type, with user-friendly member names.  */
 116 typedef struct
 117 {
 118   __io_read_fn *read;           /* Read bytes.  */
 119   __io_write_fn *write;         /* Write bytes.  */
 120   __io_seek_fn *seek;           /* Seek/tell file position.  */
 121   __io_close_fn *close;         /* Close file.  */
 122   __io_fileno_fn *fileno;       /* Return file descriptor.  */
 123 } cookie_io_functions_t;
 124 /* This name is still used in the prototypes in this file.  */
 125 typedef cookie_io_functions_t __io_functions;
 126 #else
 127 /* Stick to ANSI-safe names.  */
 128 typedef struct
 129 {
 130   __io_read_fn *__read;         /* Read bytes.  */
 131   __io_write_fn *__write;       /* Write bytes.  */
 132   __io_seek_fn *__seek;         /* Seek/tell file position.  */
 133   __io_close_fn *__close;       /* Close file.  */
 134   __io_fileno_fn *__fileno;     /* Return file descriptor.  */
 135 } __io_functions;
 136 #endif
 137
 138 /* Higher level interface, dependent on FILE representation.  */
 139 typedef struct
 140 {
 141   /* Make room in the input buffer.  */
 142   int (*__input) __P ((FILE *__stream));
 143   /* Make room in the output buffer.  */
 144   void (*__output) __P ((FILE *__stream, int __c));
 145 } __room_functions;
 146
 147 extern __const __io_functions __default_io_functions;
 148 extern __const __room_functions __default_room_functions;
 149
 150
 151 /* Default close function.  */
 152 extern __io_close_fn __stdio_close;
 153 /* Open FILE with mode M, store cookie in *COOKIEPTR.  */
 154 extern int __stdio_open __P ((__const char *__file, __io_mode __m,
 155                               __ptr_t *__cookieptr));
 156 /* Put out an error message for when stdio needs to die.  */
 157 extern void __stdio_errmsg __P ((__const char *__msg, size_t __len));
 158 /* Generate a unique file name (and possibly open it with mode "w+b").  */
 159 extern char *__stdio_gen_tempname __P ((char *__buf, size_t __bufsize,
 160                                         __const char *__dir,
 161                                         __const char *__pfx,
 162                                         int __dir_search,
 163                                         size_t *__lenptr,
 164                                         FILE **__streamptr,
 165                                         int __large_file));
 166
 167
 168 /* Print out MESSAGE on the error output and abort.  */
 169 extern void __libc_fatal __P ((__const char *__message))
 170      __attribute__ ((__noreturn__));
 171
 172
 173 /* For thread safe I/O functions we need a lock in each stream.  We
 174    keep the type opaque here.  */
 175 struct __stdio_lock;
 176
 177 /* The FILE structure.  */
 178 struct __stdio_file
 179 {
 180   /* Magic number for validation.  Must be negative in open streams
 181      for the glue to Unix stdio getc/putc to work.
 182      NOTE: stdio/glue.c has special knowledge of these first four members.  */
 183   int __magic;
 184 #define _IOMAGIC ((int) 0xfedabeeb)     /* Magic number to fill `__magic'.  */
 185 #define _GLUEMAGIC ((int) 0xfeedbabe)   /* Magic for glued Unix streams.  */
 186
 187   char *__bufp;                 /* Pointer into the buffer.  */
 188   char *__get_limit;            /* Reading limit.  */
 189   char *__put_limit;            /* Writing limit.  */
 190
 191   char *__buffer;               /* Base of buffer.  */
 192   size_t __bufsize;             /* Size of the buffer.  */
 193   __ptr_t __cookie;             /* Magic cookie.  */
 194   __io_mode __mode;             /* File access mode.  */
 195   __io_functions __io_funcs;    /* I/O functions.  */
 196   __room_functions __room_funcs;/* I/O buffer room functions.  */
 197   fpos_t __offset;              /* Current file position.  */
 198   fpos_t __target;              /* Target file position.  */
 199   FILE *__next;                 /* Next FILE in the linked list.  */
 200   char *__pushback_bufp;        /* Old bufp if char pushed back.  */
 201   unsigned char __pushback;     /* Pushed-back character.  */
 202   unsigned int __pushed_back:1; /* A char has been pushed back.  */
 203   unsigned int __eof:1;         /* End of file encountered.  */
 204   unsigned int __error:1;       /* Error encountered.  */
 205   unsigned int __userbuf:1;     /* Buffer from user (should not be freed).  */
 206   unsigned int __linebuf:1;     /* Flush on newline.  */
 207   unsigned int __linebuf_active:1; /* put_limit is not really in use.  */
 208   unsigned int __seen:1;        /* This stream has been seen.  */
 209   unsigned int __ispipe:1;      /* Nonzero if opened by popen.  */
 210   struct __stdio_lock *__lock;  /* Pointer to associated lock.  */
 211 };
 212
 213
 214 /* All macros used internally by other macros here and by stdio functions begin
 215    with `__'.  All of these may evaluate their arguments more than once.  */
 216
 217
 218 /* Nonzero if STREAM is a valid stream.
 219    STREAM must be a modifiable lvalue (wow, I got to use that term).
 220    See stdio/glue.c for what the confusing bit is about.  */
 221 #define __validfp(stream)                                                     \
 222   (stream != NULL &&                                                          \
 223    ({ if (stream->__magic == _GLUEMAGIC)                                      \
 224         stream = *((struct { int __magic; FILE **__p; } *) stream)->__p;      \
 225       stream->__magic == _IOMAGIC; }))
 226
 227 /* Clear the error and EOF indicators of STREAM.  */
 228 #define __clearerr(stream)      ((stream)->__error = (stream)->__eof = 0)
 229
 230 /* Nuke STREAM, making it unusable but available for reuse.  */
 231 extern void __invalidate __P ((FILE *__stream));
 232
 233 /* Make sure STREAM->__offset and STREAM->__target are initialized.
 234    Returns 0 if successful, or EOF on
 235    error (but doesn't set STREAM->__error).  */
 236 extern int __stdio_check_offset __P ((FILE *__stream));
 237
 238
 239 /* The possibilities for the third argument to `setvbuf'.  */
 240 #define _IOFBF  0x1             /* Full buffering.  */
 241 #define _IOLBF  0x2             /* Line buffering.  */
 242 #define _IONBF  0x4             /* No buffering.  */
 243
 244
 245 /* Default buffer size.  */
 246 #define BUFSIZ  1024
 247
 248
 249 /* End of file character.
 250    Some things throughout the library rely on this being -1.  */
 251 #define EOF     (-1)
 252
 253
 254 /* The possibilities for the third argument to `fseek'.
 255    These values should not be changed.  */
 256 #define SEEK_SET        0       /* Seek from beginning of file.  */
 257 #define SEEK_CUR        1       /* Seek from current position.  */
 258 #define SEEK_END        2       /* Seek from end of file.  */
 259
 260
 261 #ifdef  __USE_SVID
 262 /* Default path prefix for `tempnam' and `tmpnam'.  */
 263 #define P_tmpdir        "/usr/tmp"
 264 #endif
 265
 266
 267 /* Get the values:
 268    L_tmpnam     How long an array of chars must be to be passed to `tmpnam'.
 269    TMP_MAX      The minimum number of unique filenames generated by tmpnam
 270                 (and tempnam when it uses tmpnam's name space),
 271                 or tempnam (the two are separate).
 272    L_ctermid    How long an array to pass to `ctermid'.
 273    L_cuserid    How long an array to pass to `cuserid'.
 274    FOPEN_MAX    Minimum number of files that can be open at once.
 275    FILENAME_MAX Maximum length of a filename.  */
 276 #include <bits/stdio_lim.h>
 277
 278
 279 /* All the known streams are in a linked list
 280    linked by the `next' field of the FILE structure.  */
 281 extern FILE *__stdio_head;      /* Head of the list.  */
 282
 283 /* Standard streams.  */
 284 extern FILE *stdin, *stdout, *stderr;
 285 #ifdef __STRICT_ANSI__
 286 /* ANSI says these are macros; satisfy pedants.  */
 287 #define stdin   stdin
 288 #define stdout  stdout
 289 #define stderr  stderr
 290 #endif
 291
 292
 293 /* Remove file FILENAME.  */
 294 extern int remove __P ((__const char *__filename));
 295 /* Rename file OLD to NEW.  */
 296 extern int rename __P ((__const char *__old, __const char *__new));
 297
 298
 299 /* Create a temporary file and open it read/write.  */
 300 extern FILE *tmpfile __P ((void));
 301 #ifdef __USE_LARGEFILE64
 302 extern FILE *tmpfile64 __P ((void));
 303 #endif
 304 /* Generate a temporary filename.  */
 305 extern char *tmpnam __P ((char *__s));
 306
 307 #ifdef __USE_REENTRANT
 308 /* This is the reentrant variant of `tmpnam'.  The only difference is
 309    that it does not allow S to be NULL.  */
 310 extern char *tmpnam_r __P ((char *__s));
 311 #endif
 312
 313
 314 #if defined __USE_SVID || defined __USE_XOPEN
 315 /* Generate a unique temporary filename using up to five characters of PFX
 316    if it is not NULL.  The directory to put this file in is searched for
 317    as follows: First the environment variable "TMPDIR" is checked.
 318    If it contains the name of a writable directory, that directory is used.
 319    If not and if DIR is not NULL, that value is checked.  If that fails,
 320    P_tmpdir is tried and finally "/tmp".  The storage for the filename
 321    is allocated by `malloc'.  */
 322 extern char *tempnam __P ((__const char *__dir, __const char *__pfx));
 323 #endif
 324
 325
 326 /* This performs actual output when necessary, flushing
 327    STREAM's buffer and optionally writing another character.  */
 328 extern int __flshfp __P ((FILE *__stream, int __c));
 329
 330
 331 /* Close STREAM.  */
 332 extern int fclose __P ((FILE *__stream));
 333 /* Flush STREAM, or all streams if STREAM is NULL.  */
 334 extern int fflush __P ((FILE *__stream));
 335
 336 #ifdef __USE_GNU
 337 /* Close all streams.  */
 338 extern int __fcloseall __P ((void));
 339 extern int fcloseall __P ((void));
 340 #endif
 341
 342
 343 /* Open a file and create a new stream for it.  */
 344 extern FILE *fopen __P ((__const char *__filename, __const char *__modes));
 345 /* Open a file, replacing an existing stream with it. */
 346 extern FILE *freopen __P ((__const char *__restrict __filename,
 347                            __const char *__restrict __modes,
 348                            FILE *__restrict __stream));
 349
 350 /* Return a new, zeroed, stream.
 351    You must set its cookie and io_mode.
 352    The first operation will give it a buffer unless you do.
 353    It will also give it the default functions unless you set the `seen' flag.
 354    The offset is set to -1, meaning it will be determined by doing a
 355    stationary seek.  You can set it to avoid the initial tell call.
 356    The target is set to -1, meaning it will be set to the offset
 357    before the target is needed.
 358    Returns NULL if a stream can't be created.  */
 359 extern FILE *__newstream __P ((void));
 360
 361 #ifdef  __USE_POSIX
 362 /* Create a new stream that refers to an existing system file descriptor.  */
 363 extern FILE *fdopen __P ((int __fd, __const char *__modes));
 364 #endif
 365
 366 #ifdef  __USE_GNU
 367 /* Create a new stream that refers to the given magic cookie,
 368    and uses the given functions for input and output.  */
 369 extern FILE *fopencookie __P ((__ptr_t __magic_cookie, __const char *__modes,
 370                                __io_functions __io_funcs));
 371
 372 /* Create a new stream that refers to a memory buffer.  */
 373 extern FILE *fmemopen __P ((__ptr_t __s, size_t __len, __const char *__modes));
 374
 375 /* Open a stream that writes into a malloc'd buffer that is expanded as
 376    necessary.  *BUFLOC and *SIZELOC are updated with the buffer's location
 377    and the number of characters written on fflush or fclose.  */
 378 extern FILE *open_memstream __P ((char **__bufloc, size_t *__sizeloc));
 379 #endif
 380
 381
 382 /* If BUF is NULL, make STREAM unbuffered.
 383    Else make it use buffer BUF, of size BUFSIZ.  */
 384 extern void setbuf __P ((FILE *__restrict __stream, char *__restrict __buf));
 385 /* Make STREAM use buffering mode MODE.
 386    If BUF is not NULL, use N bytes of it for buffering;
 387    else allocate an internal buffer N bytes long.  */
 388 extern int setvbuf __P ((FILE *__restrict __stream, char *__restrict __buf,
 389                          int __modes, size_t __n));
 390
 391 #ifdef  __USE_BSD
 392 /* If BUF is NULL, make STREAM unbuffered.
 393    Else make it use SIZE bytes of BUF for buffering.  */
 394 extern void setbuffer __P ((FILE *__stream, char *__buf, size_t __size));
 395
 396 /* Make STREAM line-buffered.  */
 397 extern void setlinebuf __P ((FILE *__stream));
 398 #endif
 399
 400
 401 /* Write formatted output to STREAM.  */
 402 extern int fprintf __P ((FILE *__restrict __stream,
 403                          __const char *__restrict __format, ...));
 404 /* Write formatted output to stdout.  */
 405 extern int printf __P ((__const char *__restrict __format, ...));
 406 /* Write formatted output to S.  */
 407 extern int sprintf __P ((char *__restrict __s,
 408                          __const char *__restrict __format, ...));
 409
 410 /* Write formatted output to S from argument list ARG.  */
 411 extern int vfprintf __P ((FILE *__restrict __s,
 412                           __const char *__restrict __format,
 413                           __gnuc_va_list __arg));
 414 /* Write formatted output to stdout from argument list ARG.  */
 415 extern int vprintf __P ((__const char *__restrict __format,
 416                          __gnuc_va_list __arg));
 417 /* Write formatted output to S from argument list ARG.  */
 418 extern int vsprintf __P ((char *__restrict __s,
 419                           __const char *__restrict __format,
 420                           __gnuc_va_list __arg));
 421
 422 #ifdef  __OPTIMIZE__
 423 extern __inline int
 424 vprintf (const char *__restrict __fmt, __gnuc_va_list __arg)
 425 {
 426   return vfprintf (stdout, __fmt, __arg);
 427 }
 428 #endif /* Optimizing.  */
 429
 430 #if defined __USE_BSD || defined __USE_ISOC9X
 431 /* Maximum chars of output to write in MAXLEN.  */
 432 extern int __snprintf __P ((char *__s, size_t __maxlen,
 433                             __const char *__format, ...))
 434      __attribute__ ((__format__ (__printf__, 3, 4)));
 435 extern int snprintf __P ((char *__s, size_t __maxlen,
 436                           __const char *__format, ...))
 437      __attribute__ ((__format__ (__printf__, 3, 4)));
 438
 439 extern int __vsnprintf __P ((char *__s, size_t __maxlen,
 440                              __const char *__format, __gnuc_va_list __arg))
 441      __attribute__ ((__format__ (__printf__, 3, 0)));
 442 extern int vsnprintf __P ((char *__s, size_t __maxlen,
 443                            __const char *__format, __gnuc_va_list __arg))
 444      __attribute__ ((__format__ (__printf__, 3, 0)));
 445 #endif
 446
 447 #ifdef __USE_GNU
 448 /* Write formatted output to a string dynamically allocated with `malloc'.
 449    Store the address of the string in *PTR.  */
 450 extern int vasprintf __P ((char **__ptr, __const char *__f,
 451                            __gnuc_va_list __arg))
 452      __attribute__ ((__format__ (__printf__, 2, 0)));
 453 extern int asprintf __P ((char **__ptr, __const char *__fmt, ...))
 454      __attribute__ ((__format__ (__printf__, 2, 0)));
 455
 456 /* Write formatted output to a file descriptor.  */
 457 extern int vdprintf __P ((int __fd, __const char *__fmt,
 458                           __gnuc_va_list __arg))
 459      __attribute__ ((__format__ (__printf__, 2, 0)));
 460 extern int dprintf __P ((int __fd, __const char *__fmt, ...))
 461      __attribute__ ((__format__ (__printf__, 2, 0)));
 462 #endif
 463
 464
 465 /* Read formatted input from STREAM.  */
 466 extern int fscanf __P ((FILE *__restrict __stream,
 467                         __const char *__restrict __format, ...));
 468 /* Read formatted input from stdin.  */
 469 extern int scanf __P ((__const char *__restrict __format, ...));
 470 /* Read formatted input from S.  */
 471 extern int sscanf __P ((__const char *__restrict __s,
 472                         __const char *__restrict __format, ...));
 473
 474 #ifdef  __USE_GNU
 475 /* Read formatted input from S into argument list ARG.  */
 476 extern int __vfscanf __P ((FILE *__s, __const char *__format,
 477                            __gnuc_va_list __arg));
 478 extern int vfscanf __P ((FILE *__s, __const char *__format,
 479                          __gnuc_va_list __arg));
 480
 481 /* Read formatted input from stdin into argument list ARG.  */
 482 extern int __vscanf __P ((__const char *__format, __gnuc_va_list __arg));
 483 extern int vscanf __P ((__const char *__format, __gnuc_va_list __arg));
 484
 485 /* Read formatted input from S into argument list ARG.  */
 486 extern int __vsscanf __P ((__const char *__s, __const char *__format,
 487                            __gnuc_va_list __arg));
 488 extern int vsscanf __P ((__const char *__s, __const char *__format,
 489                          __gnuc_va_list __arg));
 490
 491
 492 #ifdef  __OPTIMIZE__
 493 extern __inline int
 494 vfscanf (FILE *__s, const char *__fmt, __gnuc_va_list __arg)
 495 {
 496   return __vfscanf (__s, __fmt, __arg);
 497 }
 498 extern __inline int
 499 vscanf (const char *__fmt, __gnuc_va_list __arg)
 500 {
 501   return __vfscanf (stdin, __fmt, __arg);
 502 }
 503 extern __inline int
 504 vsscanf (const char *__s, const char *__fmt, __gnuc_va_list __arg)
 505 {
 506   return __vsscanf (__s, __fmt, __arg);
 507 }
 508 #endif /* Optimizing.  */
 509 #endif /* Use GNU.  */
 510
 511
 512 /* This does actual reading when necessary, filling STREAM's
 513    buffer and returning the first character in it.  */
 514 extern int __fillbf __P ((FILE *__stream));
 515
 516
 517 /* Read a character from STREAM.  */
 518 extern int fgetc __P ((FILE *__stream));
 519 extern int getc __P ((FILE *__stream));
 520
 521 /* Read a character from stdin.  */
 522 extern int getchar __P ((void));
 523
 524 /* The C standard explicitly says this can
 525    re-evaluate its argument, so it does. */
 526 #define __getc(stream)                                                        \
 527   ((stream)->__bufp < (stream)->__get_limit ?                                 \
 528    (int) ((unsigned char) *(stream)->__bufp++) : __fillbf(stream))
 529
 530 /* The C standard explicitly says this is a macro,
 531    so we always do the optimization for it.  */
 532 #define getc(stream)    __getc(stream)
 533
 534 #ifdef  __OPTIMIZE__
 535 extern __inline int
 536 getchar (void)
 537 {
 538   return __getc (stdin);
 539 }
 540 #endif /* Optimizing.  */
 541
 542
 543 /* Write a character to STREAM.  */
 544 extern int fputc __P ((int __c, FILE *__stream));
 545 extern int putc __P ((int __c, FILE *__stream));
 546
 547 /* Write a character to stdout.  */
 548 extern int putchar __P ((int __c));
 549
 550
 551 /* The C standard explicitly says this can
 552    re-evaluate its arguments, so it does.  */
 553 #define __putc(c, stream)                                                     \
 554   ((stream)->__bufp < (stream)->__put_limit ?                                 \
 555    (int) (unsigned char) (*(stream)->__bufp++ = (unsigned char) (c)) :        \
 556    __flshfp ((stream), (unsigned char) (c)))
 557
 558 /* The C standard explicitly says this can be a macro,
 559    so we always do the optimization for it.  */
 560 #define putc(c, stream) __putc ((c), (stream))
 561
 562 #ifdef __OPTIMIZE__
 563 extern __inline int
 564 putchar (int __c)
 565 {
 566   return __putc (__c, stdout);
 567 }
 568 #endif
 569
 570
 571 #if defined __USE_SVID || defined __USE_MISC
 572 /* Get a word (int) from STREAM.  */
 573 extern int getw __P ((FILE *__stream));
 574
 575 /* Write a word (int) to STREAM.  */
 576 extern int putw __P ((int __w, FILE *__stream));
 577 #endif
 578
 579
 580 /* Get a newline-terminated string of finite length from STREAM.  */
 581 extern char *fgets __P ((char *__restrict __s, int __n,
 582                          FILE *__restrict __stream));
 583
 584 /* Get a newline-terminated string from stdin, removing the newline.
 585    DO NOT USE THIS FUNCTION!!  There is no limit on how much it will read.  */
 586 extern char *gets __P ((char *__s));
 587
 588
 589 #ifdef  __USE_GNU
 590 #include <sys/types.h>
 591
 592 /* Read up to (and including) a DELIMITER from STREAM into *LINEPTR
 593    (and null-terminate it). *LINEPTR is a pointer returned from malloc (or
 594    NULL), pointing to *N characters of space.  It is realloc'd as
 595    necessary.  Returns the number of characters read (not including the
 596    null terminator), or -1 on error or EOF.  */
 597 ssize_t __getdelim __P ((char **__lineptr, size_t *__n,
 598                          int __delimiter, FILE *__stream));
 599 ssize_t getdelim __P ((char **__lineptr, size_t *__n,
 600                        int __delimiter, FILE *__stream));
 601
 602 /* Like `getdelim', but reads up to a newline.  */
 603 ssize_t __getline __P ((char **__lineptr, size_t *__n, FILE *__stream));
 604 ssize_t getline __P ((char **__lineptr, size_t *__n, FILE *__stream));
 605
 606 #ifdef  __OPTIMIZE__
 607 extern __inline ssize_t
 608 getline (char **__lineptr, size_t *__n, FILE *__stream)
 609 {
 610   return __getdelim (__lineptr, __n, '\n', __stream);
 611 }
 612 #endif /* Optimizing.  */
 613 #endif
 614
 615
 616 /* Write a string to STREAM.  */
 617 extern int fputs __P ((__const char *__restrict __s,
 618                        FILE *__restrict __stream));
 619 /* Write a string, followed by a newline, to stdout.  */
 620 extern int puts __P ((__const char *__s));
 621
 622
 623 /* Push a character back onto the input buffer of STREAM.  */
 624 extern int ungetc __P ((int __c, FILE *__stream));
 625
 626
 627 /* Read chunks of generic data from STREAM.  */
 628 extern size_t fread __P ((__ptr_t __restrict __ptr, size_t __size,
 629                           size_t __n, FILE *__restrict __stream));
 630 /* Write chunks of generic data to STREAM.  */
 631 extern size_t fwrite __P ((__const __ptr_t __restrict __ptr, size_t __size,
 632                            size_t __n, FILE *__restrict __s));
 633
 634
 635 /* Seek to a certain position on STREAM.  */
 636 extern int fseek __P ((FILE *__stream, long int __off, int __whence));
 637 /* Return the current position of STREAM.  */
 638 extern long int ftell __P ((FILE *__stream));
 639 /* Rewind to the beginning of STREAM.  */
 640 extern void rewind __P ((FILE *__stream));
 641
 642 /* Get STREAM's position.  */
 643 extern int fgetpos __P ((FILE *__restrict __stream, fpos_t *__restrict __pos));
 644 /* Set STREAM's position.  */
 645 extern int fsetpos __P ((FILE *__stream, __const fpos_t *__pos));
 646
 647
 648 /* Clear the error and EOF indicators for STREAM.  */
 649 extern void clearerr __P ((FILE *__stream));
 650 /* Return the EOF indicator for STREAM.  */
 651 extern int feof __P ((FILE *__stream));
 652 /* Return the error indicator for STREAM.  */
 653 extern int ferror __P ((FILE *__stream));
 654
 655 #ifdef  __OPTIMIZE__
 656 #define feof(stream)    ((stream)->__eof != 0)
 657 #define ferror(stream)  ((stream)->__error != 0)
 658 #endif /* Optimizing.  */
 659
 660
 661 /* Print a message describing the meaning of the value of errno.  */
 662 extern void perror __P ((__const char *__s));
 663
 664 #ifdef  __USE_BSD
 665 extern int sys_nerr;
 666 extern const char *const sys_errlist[];
 667 #endif
 668 #ifdef  __USE_GNU
 669 extern int _sys_nerr;
 670 extern const char *const _sys_errlist[];
 671 #endif
 672
 673
 674 #ifdef  __USE_POSIX
 675 /* Return the system file descriptor for STREAM.  */
 676 extern int fileno __P ((FILE *__stream));
 677 #endif /* Use POSIX.  */
 678
 679
 680 #if (defined __USE_POSIX2 || defined __USE_SVID || defined __USE_BSD || \
 681      defined __USE_MISC)
 682 /* Create a new stream connected to a pipe running the given command.  */
 683 extern FILE *popen __P ((__const char *__command, __const char *__modes));
 684
 685 /* Close a stream opened by popen and return the status of its child.  */
 686 extern int pclose __P ((FILE *__stream));
 687 #endif
 688
 689
 690 #ifdef  __USE_POSIX
 691 /* Return the name of the controlling terminal.  */
 692 extern char *ctermid __P ((char *__s));
 693 #endif
 694
 695
 696 #ifdef __USE_XOPEN
 697 /* Return the name of the current user.  */
 698 extern char *cuserid __P ((char *__s));
 699 #endif
 700
 701
 702 #ifdef  __USE_GNU
 703 struct obstack;                 /* See <obstack.h>.  */
 704
 705 /* Open a stream that writes to OBSTACK.  */
 706 extern FILE *open_obstack_stream __P ((struct obstack *__obstack));
 707
 708 /* Write formatted output to an obstack.  */
 709 extern int obstack_printf __P ((struct obstack *__obstack,
 710                                 __const char *__format, ...));
 711 extern int obstack_vprintf __P ((struct obstack *__obstack,
 712                                  __const char *__format,
 713                                  __gnuc_va_list __args));
 714 #endif
 715
 716
 717 __END_DECLS
 718
 719 #endif /* <stdio.h> included.  */
 720
 721 #endif /* stdio.h  */