stdio/stdio.h

   1 /* Copyright (C) 1991, 1992, 1993, 1994, 1995 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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 /*
  20  *      ANSI 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 <gnu/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 ((__const char *__dir,
 160                                         __const char *__pfx,
 161                                         int __dir_search,
 162                                         size_t *__lenptr,
 163                                         FILE **__streamptr));
 164
 165
 166 /* Print out MESSAGE on the error output and abort.  */
 167 extern void __libc_fatal __P ((__const char *__message))
 168      __attribute__ ((__noreturn__));
 169
 170
 171 /* The FILE structure.  */
 172 struct __stdio_file
 173 {
 174   /* Magic number for validation.  Must be negative in open streams
 175      for the glue to Unix stdio getc/putc to work.
 176      NOTE: stdio/glue.c has special knowledge of these first four members.  */
 177   int __magic;
 178 #define _IOMAGIC        0xfedabeeb      /* Magic number to fill `__magic'.  */
 179 #define _GLUEMAGIC      0xfeedbabe      /* Magic for glued Unix streams.  */
 180
 181   char *__bufp;                 /* Pointer into the buffer.  */
 182   char *__get_limit;            /* Reading limit.  */
 183   char *__put_limit;            /* Writing limit.  */
 184
 185   char *__buffer;               /* Base of buffer.  */
 186   size_t __bufsize;             /* Size of the buffer.  */
 187   __ptr_t __cookie;             /* Magic cookie.  */
 188   __io_mode __mode;             /* File access mode.  */
 189   __io_functions __io_funcs;    /* I/O functions.  */
 190   __room_functions __room_funcs;/* I/O buffer room functions.  */
 191   fpos_t __offset;              /* Current file position.  */
 192   fpos_t __target;              /* Target file position.  */
 193   FILE *__next;                 /* Next FILE in the linked list.  */
 194   char *__pushback_bufp;        /* Old bufp if char pushed back.  */
 195   unsigned char __pushback;     /* Pushed-back character.  */
 196   unsigned int __pushed_back:1; /* A char has been pushed back.  */
 197   unsigned int __eof:1;         /* End of file encountered.  */
 198   unsigned int __error:1;       /* Error encountered.  */
 199   unsigned int __userbuf:1;     /* Buffer from user (should not be freed).  */
 200   unsigned int __linebuf:1;     /* Flush on newline.  */
 201   unsigned int __linebuf_active:1; /* put_limit is not really in use.  */
 202   unsigned int __seen:1;        /* This stream has been seen.  */
 203   unsigned int __ispipe:1;      /* Nonzero if opened by popen.  */
 204 };
 205
 206
 207 /* All macros used internally by other macros here and by stdio functions begin
 208    with `__'.  All of these may evaluate their arguments more than once.  */
 209
 210
 211 /* Nonzero if STREAM is a valid stream.
 212    STREAM must be a modifiable lvalue (wow, I got to use that term).
 213    See stdio/glue.c for what the confusing bit is about.  */
 214 #define __validfp(stream)                                                     \
 215   (stream != NULL &&                                                          \
 216    ({ if (stream->__magic == _GLUEMAGIC)                                      \
 217         stream = *((struct { int __magic; FILE **__p; } *) stream)->__p;      \
 218       stream->__magic == _IOMAGIC; }))
 219
 220 /* Clear the error and EOF indicators of STREAM.  */
 221 #define __clearerr(stream)      ((stream)->__error = (stream)->__eof = 0)
 222
 223 /* Nuke STREAM, making it unusable but available for reuse.  */
 224 extern void __invalidate __P ((FILE *__stream));
 225
 226 /* Make sure STREAM->__offset and STREAM->__target are initialized.
 227    Returns 0 if successful, or EOF on
 228    error (but doesn't set STREAM->__error).  */
 229 extern int __stdio_check_offset __P ((FILE *__stream));
 230
 231
 232 /* The possibilities for the third argument to `setvbuf'.  */
 233 #define _IOFBF  0x1             /* Full buffering.  */
 234 #define _IOLBF  0x2             /* Line buffering.  */
 235 #define _IONBF  0x4             /* No buffering.  */
 236
 237
 238 /* Default buffer size.  */
 239 #define BUFSIZ  1024
 240
 241
 242 /* End of file character.
 243    Some things throughout the library rely on this being -1.  */
 244 #define EOF     (-1)
 245
 246
 247 /* The possibilities for the third argument to `fseek'.
 248    These values should not be changed.  */
 249 #define SEEK_SET        0       /* Seek from beginning of file.  */
 250 #define SEEK_CUR        1       /* Seek from current position.  */
 251 #define SEEK_END        2       /* Seek from end of file.  */
 252
 253
 254 #ifdef  __USE_SVID
 255 /* Default path prefix for `tempnam' and `tmpnam'.  */
 256 #define P_tmpdir        "/usr/tmp"
 257 #endif
 258
 259
 260 /* Get the values:
 261    L_tmpnam     How long an array of chars must be to be passed to `tmpnam'.
 262    TMP_MAX      The minimum number of unique filenames generated by tmpnam
 263                 (and tempnam when it uses tmpnam's name space),
 264                 or tempnam (the two are separate).
 265    L_ctermid    How long an array to pass to `ctermid'.
 266    L_cuserid    How long an array to pass to `cuserid'.
 267    FOPEN_MAX    Mininum number of files that can be open at once.
 268    FILENAME_MAX Maximum length of a filename.  */
 269 #include <stdio_lim.h>
 270
 271
 272 /* All the known streams are in a linked list
 273    linked by the `next' field of the FILE structure.  */
 274 extern FILE *__stdio_head;      /* Head of the list.  */
 275
 276 /* Standard streams.  */
 277 extern FILE *stdin, *stdout, *stderr;
 278 #ifdef __STRICT_ANSI__
 279 /* ANSI says these are macros; satisfy pedants.  */
 280 #define stdin   stdin
 281 #define stdout  stdout
 282 #define stderr  stderr
 283 #endif
 284
 285
 286 /* Remove file FILENAME.  */
 287 extern int remove __P ((__const char *__filename));
 288 /* Rename file OLD to NEW.  */
 289 extern int rename __P ((__const char *__old, __const char *__new));
 290
 291
 292 /* Create a temporary file and open it read/write.  */
 293 extern FILE *tmpfile __P ((void));
 294 /* Generate a temporary filename.  */
 295 extern char *tmpnam __P ((char *__s));
 296
 297
 298 #ifdef  __USE_SVID
 299 /* Generate a unique temporary filename using up to five characters of PFX
 300    if it is not NULL.  The directory to put this file in is searched for
 301    as follows: First the environment variable "TMPDIR" is checked.
 302    If it contains the name of a writable directory, that directory is used.
 303    If not and if DIR is not NULL, that value is checked.  If that fails,
 304    P_tmpdir is tried and finally "/tmp".  The storage for the filename
 305    is allocated by `malloc'.  */
 306 extern char *tempnam __P ((__const char *__dir, __const char *__pfx));
 307 #endif
 308
 309
 310 /* This performs actual output when necessary, flushing
 311    STREAM's buffer and optionally writing another character.  */
 312 extern int __flshfp __P ((FILE *__stream, int __c));
 313
 314
 315 /* Close STREAM, or all streams if STREAM is NULL.  */
 316 extern int fclose __P ((FILE *__stream));
 317 /* Flush STREAM, or all streams if STREAM is NULL.  */
 318 extern int fflush __P ((FILE *__stream));
 319
 320
 321 /* Open a file and create a new stream for it.  */
 322 extern FILE *fopen __P ((__const char *__filename, __const char *__modes));
 323 /* Open a file, replacing an existing stream with it. */
 324 extern FILE *freopen __P ((__const char *__filename,
 325                            __const char *__modes, FILE *__stream));
 326
 327 /* Return a new, zeroed, stream.
 328    You must set its cookie and io_mode.
 329    The first operation will give it a buffer unless you do.
 330    It will also give it the default functions unless you set the `seen' flag.
 331    The offset is set to -1, meaning it will be determined by doing a
 332    stationary seek.  You can set it to avoid the initial tell call.
 333    The target is set to -1, meaning it will be set to the offset
 334    before the target is needed.
 335    Returns NULL if a stream can't be created.  */
 336 extern FILE *__newstream __P ((void));
 337
 338 #ifdef  __USE_POSIX
 339 /* Create a new stream that refers to an existing system file descriptor.  */
 340 extern FILE *fdopen __P ((int __fd, __const char *__modes));
 341 #endif
 342
 343 #ifdef  __USE_GNU
 344 /* Create a new stream that refers to the given magic cookie,
 345    and uses the given functions for input and output.  */
 346 extern FILE *fopencookie __P ((__ptr_t __magic_cookie, __const char *__modes,
 347                                __io_functions __io_funcs));
 348
 349 /* Create a new stream that refers to a memory buffer.  */
 350 extern FILE *fmemopen __P ((__ptr_t __s, size_t __len, __const char *__modes));
 351
 352 /* Open a stream that writes into a malloc'd buffer that is expanded as
 353    necessary.  *BUFLOC and *SIZELOC are updated with the buffer's location
 354    and the number of characters written on fflush or fclose.  */
 355 extern FILE *open_memstream __P ((char **__bufloc, size_t *__sizeloc));
 356 #endif
 357
 358
 359 /* If BUF is NULL, make STREAM unbuffered.
 360    Else make it use buffer BUF, of size BUFSIZ.  */
 361 extern void setbuf __P ((FILE *__stream, char *__buf));
 362 /* Make STREAM use buffering mode MODE.
 363    If BUF is not NULL, use N bytes of it for buffering;
 364    else allocate an internal buffer N bytes long.  */
 365 extern int setvbuf __P ((FILE *__stream, char *__buf,
 366                          int __modes, size_t __n));
 367
 368 #ifdef  __USE_BSD
 369 /* If BUF is NULL, make STREAM unbuffered.
 370    Else make it use SIZE bytes of BUF for buffering.  */
 371 extern void setbuffer __P ((FILE *__stream, char *__buf, size_t __size));
 372
 373 /* Make STREAM line-buffered.  */
 374 extern void setlinebuf __P ((FILE *__stream));
 375 #endif
 376
 377
 378 /* Write formatted output to STREAM.  */
 379 extern int fprintf __P ((FILE *__stream, __const char *__format, ...));
 380 /* Write formatted output to stdout.  */
 381 extern int printf __P ((__const char *__format, ...));
 382 /* Write formatted output to S.  */
 383 extern int sprintf __P ((char *__s, __const char *__format, ...));
 384
 385 /* Write formatted output to S from argument list ARG.  */
 386 extern int vfprintf __P ((FILE *__s, __const char *__format,
 387                           __gnuc_va_list __arg));
 388 /* Write formatted output to stdout from argument list ARG.  */
 389 extern int vprintf __P ((__const char *__format, __gnuc_va_list __arg));
 390 /* Write formatted output to S from argument list ARG.  */
 391 extern int vsprintf __P ((char *__s, __const char *__format,
 392                           __gnuc_va_list __arg));
 393
 394 #ifdef  __OPTIMIZE__
 395 extern __inline int
 396 vprintf (const char *__fmt, __gnuc_va_list __arg)
 397 {
 398   return vfprintf (stdout, __fmt, __arg);
 399 }
 400 #endif /* Optimizing.  */
 401
 402 #ifdef  __USE_GNU
 403 /* Maximum chars of output to write in MAXLEN.  */
 404 extern int snprintf __P ((char *__s, size_t __maxlen,
 405                           __const char *__format, ...));
 406
 407 extern int vsnprintf __P ((char *__s, size_t __maxlen,
 408                            __const char *__format, __gnuc_va_list __arg));
 409
 410 /* Write formatted output to a string dynamically allocated with `malloc'.
 411    Store the address of the string in *PTR.  */
 412 extern int vasprintf __P ((char **__ptr, __const char *__f,
 413                            __gnuc_va_list __arg));
 414 extern int asprintf __P ((char **__ptr, __const char *__fmt, ...));
 415
 416 /* Write formatted output to a file descriptor.  */
 417 extern int vdprintf __P ((int __fd, __const char *__fmt,
 418                           __gnuc_va_list __arg));
 419 extern int dprintf __P ((int __fd, __const char *__fmt, ...));
 420 #endif
 421
 422
 423 /* Read formatted input from STREAM.  */
 424 extern int fscanf __P ((FILE *__stream, __const char *__format, ...));
 425 /* Read formatted input from stdin.  */
 426 extern int scanf __P ((__const char *__format, ...));
 427 /* Read formatted input from S.  */
 428 extern int sscanf __P ((__const char *__s, __const char *__format, ...));
 429
 430 #ifdef  __USE_GNU
 431 /* Read formatted input from S into argument list ARG.  */
 432 extern int __vfscanf __P ((FILE *__s, __const char *__format,
 433                            __gnuc_va_list __arg));
 434 extern int vfscanf __P ((FILE *__s, __const char *__format,
 435                          __gnuc_va_list __arg));
 436
 437 /* Read formatted input from stdin into argument list ARG.  */
 438 extern int vscanf __P ((__const char *__format, __gnuc_va_list __arg));
 439
 440 /* Read formatted input from S into argument list ARG.  */
 441 extern int __vsscanf __P ((__const char *__s, __const char *__format,
 442                            __gnuc_va_list __arg));
 443 extern int vsscanf __P ((__const char *__s, __const char *__format,
 444                          __gnuc_va_list __arg));
 445
 446
 447 #ifdef  __OPTIMIZE__
 448 extern __inline int
 449 vfscanf (FILE *__s, const char *__fmt, __gnuc_va_list __arg)
 450 {
 451   return __vfscanf (__s, __fmt, __arg);
 452 }
 453 extern __inline int
 454 vscanf (const char *__fmt, __gnuc_va_list __arg)
 455 {
 456   return __vfscanf (stdin, __fmt, __arg);
 457 }
 458 extern __inline int
 459 vsscanf (const char *__s, const char *__fmt, __gnuc_va_list __arg)
 460 {
 461   return __vsscanf (__s, __fmt, __arg);
 462 }
 463 #endif /* Optimizing.  */
 464 #endif /* Use GNU.  */
 465
 466
 467 /* This does actual reading when necessary, filling STREAM's
 468    buffer and returning the first character in it.  */
 469 extern int __fillbf __P ((FILE *__stream));
 470
 471
 472 /* Read a character from STREAM.  */
 473 extern int fgetc __P ((FILE *__stream));
 474 extern int getc __P ((FILE *__stream));
 475
 476 /* Read a character from stdin.  */
 477 extern int getchar __P ((void));
 478
 479 /* The C standard explicitly says this can
 480    re-evaluate its argument, so it does. */
 481 #define __getc(stream)                                                        \
 482   ((stream)->__bufp < (stream)->__get_limit ?                                 \
 483    (int) ((unsigned char) *(stream)->__bufp++) : __fillbf(stream))
 484
 485 /* The C standard explicitly says this is a macro,
 486    so we always do the optimization for it.  */
 487 #define getc(stream)    __getc(stream)
 488
 489 #ifdef  __OPTIMIZE__
 490 extern __inline int
 491 getchar (void)
 492 {
 493   return __getc (stdin);
 494 }
 495 #endif /* Optimizing.  */
 496
 497
 498 /* Write a character to STREAM.  */
 499 extern int fputc __P ((int __c, FILE *__stream));
 500 extern int putc __P ((int __c, FILE *__stream));
 501
 502 /* Write a character to stdout.  */
 503 extern int putchar __P ((int __c));
 504
 505
 506 /* The C standard explicitly says this can
 507    re-evaluate its arguments, so it does.  */
 508 #define __putc(c, stream)                                                     \
 509   ((stream)->__bufp < (stream)->__put_limit ?                                 \
 510    (int) (unsigned char) (*(stream)->__bufp++ = (unsigned char) (c)) :        \
 511    __flshfp ((stream), (unsigned char) (c)))
 512
 513 /* The C standard explicitly says this can be a macro,
 514    so we always do the optimization for it.  */
 515 #define putc(c, stream) __putc ((c), (stream))
 516
 517 #ifdef __OPTIMIZE__
 518 extern __inline int
 519 putchar (int __c)
 520 {
 521   return __putc (__c, stdout);
 522 }
 523 #endif
 524
 525
 526 #if defined(__USE_SVID) || defined(__USE_MISC)
 527 /* Get a word (int) from STREAM.  */
 528 extern int getw __P ((FILE *__stream));
 529
 530 /* Write a word (int) to STREAM.  */
 531 extern int putw __P ((int __w, FILE *__stream));
 532 #endif
 533
 534
 535 /* Get a newline-terminated string of finite length from STREAM.  */
 536 extern char *fgets __P ((char *__s, int __n, FILE *__stream));
 537
 538 /* Get a newline-terminated string from stdin, removing the newline.
 539    DO NOT USE THIS FUNCTION!!  There is no limit on how much it will read.  */
 540 extern char *gets __P ((char *__s));
 541
 542
 543 #ifdef  __USE_GNU
 544 #include <sys/types.h>
 545
 546 /* Read up to (and including) a DELIMITER from STREAM into *LINEPTR
 547    (and null-terminate it). *LINEPTR is a pointer returned from malloc (or
 548    NULL), pointing to *N characters of space.  It is realloc'd as
 549    necessary.  Returns the number of characters read (not including the
 550    null terminator), or -1 on error or EOF.  */
 551 ssize_t __getdelim __P ((char **__lineptr, size_t *__n,
 552                          int __delimiter, FILE *__stream));
 553 ssize_t getdelim __P ((char **__lineptr, size_t *__n,
 554                        int __delimiter, FILE *__stream));
 555
 556 /* Like `getdelim', but reads up to a newline.  */
 557 ssize_t __getline __P ((char **__lineptr, size_t *__n, FILE *__stream));
 558 ssize_t getline __P ((char **__lineptr, size_t *__n, FILE *__stream));
 559
 560 #ifdef  __OPTIMIZE__
 561 extern __inline ssize_t
 562 __getline (char **__lineptr, size_t *__n, FILE *__stream)
 563 {
 564   return __getdelim (__lineptr, __n, '\n', __stream);
 565 }
 566
 567 extern __inline ssize_t
 568 getdelim (char **__lineptr, size_t *__n, int __delimiter, FILE *__stream)
 569 {
 570   return __getdelim (__lineptr, __n, __delimiter, __stream);
 571 }
 572 extern __inline ssize_t
 573 getline (char **__lineptr, size_t *__n, FILE *__stream)
 574 {
 575   return __getline (__lineptr, __n, __stream);
 576 }
 577 #endif /* Optimizing.  */
 578 #endif
 579
 580
 581 /* Write a string to STREAM.  */
 582 extern int fputs __P ((__const char *__s, FILE *__stream));
 583 /* Write a string, followed by a newline, to stdout.  */
 584 extern int puts __P ((__const char *__s));
 585
 586
 587 /* Push a character back onto the input buffer of STREAM.  */
 588 extern int ungetc __P ((int __c, FILE *__stream));
 589
 590
 591 /* Read chunks of generic data from STREAM.  */
 592 extern size_t fread __P ((__ptr_t __ptr, size_t __size,
 593                           size_t __n, FILE *__stream));
 594 /* Write chunks of generic data to STREAM.  */
 595 extern size_t fwrite __P ((__const __ptr_t __ptr, size_t __size,
 596                            size_t __n, FILE *__s));
 597
 598
 599 /* Seek to a certain position on STREAM.  */
 600 extern int fseek __P ((FILE *__stream, long int __off, int __whence));
 601 /* Return the current position of STREAM.  */
 602 extern long int ftell __P ((FILE *__stream));
 603 /* Rewind to the beginning of STREAM.  */
 604 extern void rewind __P ((FILE *__stream));
 605
 606 /* Get STREAM's position.  */
 607 extern int fgetpos __P ((FILE *__stream, fpos_t *__pos));
 608 /* Set STREAM's position.  */
 609 extern int fsetpos __P ((FILE *__stream, __const fpos_t *__pos));
 610
 611
 612 /* Clear the error and EOF indicators for STREAM.  */
 613 extern void clearerr __P ((FILE *__stream));
 614 /* Return the EOF indicator for STREAM.  */
 615 extern int feof __P ((FILE *__stream));
 616 /* Return the error indicator for STREAM.  */
 617 extern int ferror __P ((FILE *__stream));
 618
 619 #ifdef  __OPTIMIZE__
 620 #define feof(stream)    ((stream)->__eof != 0)
 621 #define ferror(stream)  ((stream)->__error != 0)
 622 #endif /* Optimizing.  */
 623
 624
 625 /* Print a message describing the meaning of the value of errno.  */
 626 extern void perror __P ((__const char *__s));
 627
 628 #ifdef  __USE_BSD
 629 extern int sys_nerr;
 630 extern char *sys_errlist[];
 631 #endif
 632 #ifdef  __USE_GNU
 633 extern int _sys_nerr;
 634 extern char *_sys_errlist[];
 635 #endif
 636
 637
 638 #ifdef  __USE_POSIX
 639 /* Return the system file descriptor for STREAM.  */
 640 extern int fileno __P ((FILE *__stream));
 641 #endif /* Use POSIX.  */
 642
 643
 644 #if (defined (__USE_POSIX2) || defined(__USE_SVID) || defined(__USE_BSD) || \
 645      defined(__USE_MISC))
 646 /* Create a new stream connected to a pipe running the given command.  */
 647 extern FILE *popen __P ((__const char *__command, __const char *__modes));
 648
 649 /* Close a stream opened by popen and return the status of its child.  */
 650 extern int pclose __P ((FILE *__stream));
 651 #endif
 652
 653
 654 #ifdef  __USE_POSIX
 655 /* Return the name of the controlling terminal.  */
 656 extern char *ctermid __P ((char *__s));
 657 /* Return the name of the current user.  */
 658 extern char *cuserid __P ((char *__s));
 659 #endif
 660
 661
 662 #ifdef  __USE_GNU
 663 struct obstack;                 /* See <obstack.h>.  */
 664
 665 /* Open a stream that writes to OBSTACK.  */
 666 extern FILE *open_obstack_stream __P ((struct obstack *__obstack));
 667
 668 /* Write formatted output to an obstack.  */
 669 extern int obstack_printf __P ((struct obstack *__obstack,
 670                                 __const char *__format, ...));
 671 extern int obstack_vprintf __P ((struct obstack *__obstack,
 672                                  __const char *__format,
 673                                  __gnuc_va_list __args));
 674 #endif
 675
 676
 677 __END_DECLS
 678
 679 #endif /* <stdio.h> included.  */
 680
 681 #endif /* stdio.h  */