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