libio/libio.h

   1 /*
   2 Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation
   3
   4 This file is part of the GNU IO Library.  This library is free
   5 software; you can redistribute it and/or modify it under the
   6 terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 This library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this library; see the file COPYING.  If not, write to the Free
  17 Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 As a special exception, if you link this library with files
  20 compiled with a GNU compiler to produce an executable, this does not cause
  21 the resulting executable to be covered by the GNU General Public License.
  22 This exception does not however invalidate any other reasons why
  23 the executable file might be covered by the GNU General Public License. */
  24
  25 /* This is part of the iostream library.  Written by Per Bothner. */
  26
  27 #ifndef _IO_STDIO_H
  28 #define _IO_STDIO_H
  29 #include <features.h>
  30
  31 #include <_G_config.h>
  32 #define _IO_pos_t _G_fpos_t /* obsolete */
  33 #define _IO_fpos_t _G_fpos_t
  34 #define _IO_size_t _G_size_t
  35 #define _IO_ssize_t _G_ssize_t
  36 #define _IO_off_t _G_off_t
  37 #define _IO_pid_t _G_pid_t
  38 #define _IO_uid_t _G_uid_t
  39 #define _IO_HAVE_SYS_WAIT _G_HAVE_SYS_WAIT
  40 #define _IO_HAVE_ST_BLKSIZE _G_HAVE_ST_BLKSIZE
  41 #define _IO_BUFSIZ _G_BUFSIZ
  42 #define _IO_va_list _G_va_list
  43
  44 #ifdef _G_NEED_STDARG_H
  45 /* This define avoids name pollution if we're using GNU stdarg.h */
  46 #define __need___va_list
  47 #include <stdarg.h>
  48 #ifdef __GNUC_VA_LIST
  49 #undef _IO_va_list
  50 #define _IO_va_list __gnuc_va_list
  51 #endif /* __GNUC_VA_LIST */
  52 #endif
  53
  54 #ifndef __P
  55 #ifdef __STDC__
  56 #define __P(protos) protos
  57 #else
  58 #define __P(protos) ()
  59 #endif
  60 #endif /*!__P*/
  61
  62 /* For backward compatibility */
  63 #ifndef _PARAMS
  64 #define _PARAMS(protos) __P(protos)
  65 #endif /*!_PARAMS*/
  66
  67 #ifndef __STDC__
  68 #define const
  69 #endif
  70 #define _IO_UNIFIED_JUMPTABLES 1
  71
  72 #if 0
  73 #ifdef _IO_NEED_STDARG_H
  74 #include <stdarg.h>
  75 #endif
  76 #endif
  77
  78 #ifndef EOF
  79 #define EOF (-1)
  80 #endif
  81 #ifndef NULL
  82 #if !defined(__cplusplus) || defined(__GNUC__)
  83 #define NULL ((void*)0)
  84 #else
  85 #define NULL (0)
  86 #endif
  87 #endif
  88
  89 #define _IOS_INPUT      1
  90 #define _IOS_OUTPUT     2
  91 #define _IOS_ATEND      4
  92 #define _IOS_APPEND     8
  93 #define _IOS_TRUNC      16
  94 #define _IOS_NOCREATE   32
  95 #define _IOS_NOREPLACE  64
  96 #define _IOS_BIN        128
  97
  98 /* Magic numbers and bits for the _flags field.
  99    The magic numbers use the high-order bits of _flags;
 100    the remaining bits are abailable for variable flags.
 101    Note: The magic numbers must all be negative if stdio
 102    emulation is desired. */
 103
 104 #define _IO_MAGIC 0xFBAD0000 /* Magic number */
 105 #define _OLD_STDIO_MAGIC 0xFABC0000 /* Emulate old stdio. */
 106 #define _IO_MAGIC_MASK 0xFFFF0000
 107 #define _IO_USER_BUF 1 /* User owns buffer; don't delete it on close. */
 108 #define _IO_UNBUFFERED 2
 109 #define _IO_NO_READS 4 /* Reading not allowed */
 110 #define _IO_NO_WRITES 8 /* Writing not allowd */
 111 #define _IO_EOF_SEEN 0x10
 112 #define _IO_ERR_SEEN 0x20
 113 #define _IO_DELETE_DONT_CLOSE 0x40 /* Don't call close(_fileno) on cleanup. */
 114 #define _IO_LINKED 0x80 /* Set if linked (using _chain) to streambuf::_list_all.*/
 115 #define _IO_IN_BACKUP 0x100
 116 #define _IO_LINE_BUF 0x200
 117 #define _IO_TIED_PUT_GET 0x400 /* Set if put and get pointer logicly tied. */
 118 #define _IO_CURRENTLY_PUTTING 0x800
 119 #define _IO_IS_APPENDING 0x1000
 120 #define _IO_IS_FILEBUF 0x2000
 121
 122 /* These are "formatting flags" matching the iostream fmtflags enum values. */
 123 #define _IO_SKIPWS 01
 124 #define _IO_LEFT 02
 125 #define _IO_RIGHT 04
 126 #define _IO_INTERNAL 010
 127 #define _IO_DEC 020
 128 #define _IO_OCT 040
 129 #define _IO_HEX 0100
 130 #define _IO_SHOWBASE 0200
 131 #define _IO_SHOWPOINT 0400
 132 #define _IO_UPPERCASE 01000
 133 #define _IO_SHOWPOS 02000
 134 #define _IO_SCIENTIFIC 04000
 135 #define _IO_FIXED 010000
 136 #define _IO_UNITBUF 020000
 137 #define _IO_STDIO 040000
 138 #define _IO_DONT_CLOSE 0100000
 139
 140
 141 struct _IO_jump_t;  struct _IO_FILE;
 142
 143 /* Define the user-visible type, with user-friendly member names.  */
 144 typedef struct
 145 {
 146   _IO_ssize_t (*read) __P ((struct _IO_FILE *, void *, _IO_ssize_t));
 147   _IO_ssize_t (*write) __P ((struct _IO_FILE *, const void *, _IO_ssize_t));
 148   _IO_fpos_t (*seek) __P ((struct _IO_FILE *, _IO_off_t, int));
 149   int (*close) __P ((struct _IO_FILE *));
 150 } _IO_cookie_io_functions_t;
 151
 152 /* Handle lock.  */
 153 #ifdef _IO_MTSAFE_IO
 154 #include <stdio-lock.h>
 155 #else
 156 typedef void _IO_lock_t;
 157 #endif
 158
 159
 160 /* A streammarker remembers a position in a buffer. */
 161
 162 struct _IO_marker {
 163   struct _IO_marker *_next;
 164   struct _IO_FILE *_sbuf;
 165   /* If _pos >= 0
 166  it points to _buf->Gbase()+_pos. FIXME comment */
 167   /* if _pos < 0, it points to _buf->eBptr()+_pos. FIXME comment */
 168   int _pos;
 169 #if 0
 170     void set_streampos(streampos sp) { _spos = sp; }
 171     void set_offset(int offset) { _pos = offset; _spos = (streampos)(-2); }
 172   public:
 173     streammarker(streambuf *sb);
 174     ~streammarker();
 175     int saving() { return  _spos == -2; }
 176     int delta(streammarker&);
 177     int delta();
 178 #endif
 179 };
 180
 181 struct _IO_FILE {
 182   int _flags;           /* High-order word is _IO_MAGIC; rest is flags. */
 183 #define _IO_file_flags _flags
 184
 185   /* The following pointers correspond to the C++ streambuf protocol. */
 186   char* _IO_read_ptr;   /* Current read pointer */
 187   char* _IO_read_end;   /* End of get area. */
 188   char* _IO_read_base;  /* Start of putback+get area. */
 189   char* _IO_write_base; /* Start of put area. */
 190   char* _IO_write_ptr;  /* Current put pointer. */
 191   char* _IO_write_end;  /* End of put area. */
 192   char* _IO_buf_base;   /* Start of reserve area. */
 193   char* _IO_buf_end;    /* End of reserve area. */
 194   /* The following fields are used to support backing up and undo. */
 195   char *_IO_save_base; /* Pointer to start of non-current get area. */
 196   char *_IO_backup_base;  /* Pointer to first valid character of backup area */
 197   char *_IO_save_end; /* Pointer to end of non-current get area. */
 198
 199   struct _IO_marker *_markers;
 200
 201   struct _IO_FILE *_chain;
 202
 203 #if  !_IO_UNIFIED_JUMPTABLES
 204   struct _IO_jump_t *_jumps; /* Jump table */
 205 #endif
 206
 207   int _fileno;
 208   int _blksize;
 209   _IO_off_t _offset;
 210
 211 #define __HAVE_COLUMN /* temporary */
 212   /* 1+column number of pbase(); 0 is unknown. */
 213   unsigned short _cur_column;
 214   char _unused;
 215   char _shortbuf[1];
 216
 217   /*  char* _save_gptr;  char* _save_egptr; */
 218
 219   _IO_lock_t *_lock;
 220 };
 221
 222 #ifndef __cplusplus
 223 typedef struct _IO_FILE _IO_FILE;
 224 #endif
 225
 226 struct _IO_FILE_plus;
 227 extern struct _IO_FILE_plus _IO_stdin_, _IO_stdout_, _IO_stderr_;
 228 #define _IO_stdin ((_IO_FILE*)(&_IO_stdin_))
 229 #define _IO_stdout ((_IO_FILE*)(&_IO_stdout_))
 230 #define _IO_stderr ((_IO_FILE*)(&_IO_stderr_))
 231
 232
 233 /* Special file type for fopencookie function.  */
 234 struct _IO_cookie_file {
 235   struct _IO_FILE file;
 236   const void *vtable;
 237   void *cookie;
 238   _IO_cookie_io_functions_t io_functions;
 239 };
 240
 241
 242 #ifdef __cplusplus
 243 extern "C" {
 244 #endif
 245
 246 extern int __underflow __P((_IO_FILE*));
 247 extern int __uflow __P((_IO_FILE*));
 248 extern int __overflow __P((_IO_FILE*, int));
 249
 250 #define _IO_getc_unlocked(_fp) \
 251        ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end ? __uflow(_fp) \
 252         : *(unsigned char*)(_fp)->_IO_read_ptr++)
 253 #define _IO_peekc_unlocked(_fp) \
 254        ((_fp)->_IO_read_ptr >= (_fp)->_IO_read_end \
 255           && __underflow(_fp) == EOF ? EOF \
 256         : *(unsigned char*)(_fp)->_IO_read_ptr)
 257
 258 #define _IO_putc_unlocked(_ch, _fp) \
 259    (((_fp)->_IO_write_ptr >= (_fp)->_IO_write_end) \
 260     ? __overflow(_fp, (unsigned char)(_ch)) \
 261     : (unsigned char)(*(_fp)->_IO_write_ptr++ = (_ch)))
 262
 263 #define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
 264 #define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)
 265
 266 extern int _IO_getc __P ((_IO_FILE *__fp));
 267 extern int _IO_putc __P ((int __c, _IO_FILE *__fp));
 268 extern int _IO_feof __P ((_IO_FILE *__fp));
 269 extern int _IO_ferror __P ((_IO_FILE *__fp));
 270
 271 extern int _IO_peekc_locked __P ((_IO_FILE *__fp));
 272
 273 /* This one is for Emacs. */
 274 #define _IO_PENDING_OUTPUT_COUNT(_fp)   \
 275         ((_fp)->_IO_write_ptr - (_fp)->_IO_write_base)
 276
 277 extern void _IO_flockfile __P ((_IO_FILE *));
 278 extern void _IO_funlockfile __P ((_IO_FILE *));
 279 extern int _IO_ftrylockfile __P ((_IO_FILE *));
 280
 281 #ifdef _IO_MTSAFE_IO
 282 weak_extern (_IO_flockfile)
 283 weak_extern (_IO_funlockfile)
 284 #else
 285 # define _IO_flockfile(_fp) /**/
 286 # define _IO_funlockfile(_fp) /**/
 287 # define _IO_ftrylockfile(_fp) /**/
 288 #endif /* !_IO_MTSAFE_IO */
 289
 290 #ifdef __USE_REENTRANT
 291 # define _IO_getc(_fp) _IO_getc (_fp)
 292 # define _IO_peekc(_fp) _IO_peekc_locked (_fp)
 293 # define _IO_putc(_ch, _fp) _IO_putc (_ch, _fp)
 294 # define _IO_feof(_fp) _IO_feof (_fp)
 295 # define _IO_ferror(_fp) _IO_ferror (_fp)
 296 #else
 297 # define _IO_getc(_fp) _IO_getc_unlocked (_fp)
 298 # define _IO_peekc(_fp) _IO_peekc_unlocked (_fp)
 299 # define _IO_putc(_ch, _fp) _IO_putc_unlocked (_ch, _fp)
 300 # define _IO_feof(_fp) _IO_feof_unlocked (_fp)
 301 # define _IO_ferror(_fp) _IO_ferror_unlocked (_fp)
 302 #endif
 303
 304 extern int _IO_vfscanf __P((_IO_FILE*, const char*, _IO_va_list, int*));
 305 extern int _IO_vfprintf __P((_IO_FILE*, const char*, _IO_va_list));
 306 extern _IO_ssize_t _IO_padn __P((_IO_FILE *, int, _IO_ssize_t));
 307 extern _IO_size_t _IO_sgetn __P((_IO_FILE *, void*, _IO_size_t));
 308
 309 extern void _IO_free_backup_area __P((_IO_FILE*));
 310
 311 #ifdef __cplusplus
 312 }
 313 #endif
 314
 315 #endif /* _IO_STDIO_H */