summaryrefslogtreecommitdiff
path: root/gnu/lib/libg++/g++-include/File.h
blob: ce9dbef8bf02d080e389fc6942cc7cf602d6d8e4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
// This may look like C code, but it is really -*- C++ -*-
/* 
Copyright (C) 1988 Free Software Foundation
    written by Doug Lea (dl@rocky.oswego.edu)

This file is part of GNU CC.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY.  No author or distributor
accepts responsibility to anyone for the consequences of using it
or for whether it serves any particular purpose or works at all,
unless he says so in writing.  Refer to the GNU CC General Public
License for full details.

Everyone is granted permission to copy, modify and redistribute
GNU CC, but only under the conditions described in the
GNU CC General Public License.   A copy of this license is
supposed to have been given to you along with GNU CC so you
can know your rights and responsibilities.  It should be in a
file named COPYING.  Among other things, the copyright notice
and this notice must be preserved on all copies.  
*/

#ifndef _File_h 
#ifdef __GNUG__
#pragma once
#pragma interface
#endif
#define _File_h 1

#include <builtin.h>
#include <stdio.h>
#include <stddef.h>

#include <Fmodes.h>

class Filebuf;

class File
{
  friend class  Filebuf;
protected:
  FILE*         fp;              // _iobuf file pointer
  char*         nm;              // file name (dynamically allocated)
  char          rw;              //  1 = read; 2 = write; 3 = readwrite
                                 //  bit 2 (4) means read/write into string
  state_value   state;           // _good/_eof/_fail/_bad
  long          stat;            // last read/write/... return value

  void          initialize();
  void          reinitialize(const char*);
  char         *readline (int chunk_number, char terminator);

public:
                File();
                File(const char* filename, io_mode m, access_mode a);
                File(const char* filename, const char* m);   
                File(int filedesc, io_mode m);
                File(FILE* fileptr);
                File(int sz, char* buf, io_mode m);

                ~File();

// binding, rebinding, unbinding to physical files

  File&         open(const char* filename, io_mode m, access_mode a);
  File&         open(const char* filename, const char* m);
  File&         open(int  filedesc, io_mode m);
  File&         open(FILE* fileptr);

  File&         close();
  File&         remove();

// class variable access

  int           filedesc();
  const char*   name();
  void          setname(const char* newname);
  int           iocount();

  int           rdstate();
  int           eof();
  int           fail();
  int           bad();
  int           good();

// other status queries

  int           readable();
  int           writable();
  int           is_open();

                operator void*();

// error handling

  void          error();
  void          clear(state_value f = _good); // poorly named
  void          set(state_value f); // set corresponding but
  void          unset(state_value f); // clear corresponding bit
  File&         failif(int cond);
  void          check_state();

// character IO

  File&         get(char& c);
  File&         put(char  c);
  File&         unget(char c);
  File&         putback(char c); // a synonym for unget

// char* IO

  File&         put(const char* s);
  File&         get    (char* s, int n, char terminator = '\n');
  File&         getline(char* s, int n, char terminator = '\n');
  File&         gets   (char **s, char terminator = '\n');

// binary IO

  File&         read(void* x, int sz, int n);
  File&         write(void* x, int sz, int n);

// formatted IO

  File&         form(const char* ...);
  File&         scan(const char* ...);

// buffer IO

  File&         flush();

// position control

  File&         seek(long pos, int seek_mode=0); // default seek mode=absolute
  long          tell();

// buffer control

  File&         setbuf(int buffer_kind); // legal vals: _IONBF, _IOFBF, _IOLBF
  File&         setbuf(int size, char* buf);
  File&         raw();
};


// error handlers

extern void  verbose_File_error_handler(const char*);
extern void  quiet_File_error_handler(const char*);
extern void  fatal_File_error_handler(const char*);
extern one_arg_error_handler_t File_error_handler;
extern one_arg_error_handler_t set_File_error_handler(one_arg_error_handler_t);

#if defined(__OPTIMIZE__) || defined(USE_LIBGXX_INLINES)



inline int File::filedesc()
{ 
  return fileno(fp);
}

inline const char* File::name()
{ 
  return nm; 
}

inline int File::iocount()
{ 
  return stat; 
}

inline void File::clear(state_value flag)
{ 
  state = flag;
}

inline void File::set(state_value flag)
{ 
  state = state_value(int(state) | int(flag));
}

inline void File::unset(state_value flag)
{ 
  state = state_value(int(state) & ~int(flag));
}

inline int File::readable()
{ 
  if (fp != 0) { if (feof(fp)) set(_eof); if (ferror(fp)) set(_bad);}
  return (state == _good && (rw & 01));
}

inline int File::writable()
{ 
  if (fp != 0 && ferror(fp)) set(_bad);
  return ((int(state) & (int(_fail)|int(_bad))) == 0 && (rw & 02));
}

inline int File::is_open()
{ 
  return (fp != 0);
}


inline File& File::raw()
{ 
  return this->File::setbuf(_IONBF); 
}


inline File& File::failif(int cond)
{ 
  if (cond) set(_fail);  return *this; 
}

inline File& File::get(char& c)
{ 
  if (readable())
  {
    int ch = getc(fp);
    c = ch;
    failif (ch == EOF);
  }
  return *this;
}

inline File& File::put(char  c) 
{ 
  return failif (!writable() ||  putc(c, fp) == EOF);
}

inline File& File::unget(char c)
{ 
  return failif(!is_open() || !(rw & 01) || ungetc(c, fp) == EOF);
} 

inline File& File::putback(char c)
{ 
  return failif (!is_open() || !(rw & 01) || ungetc(c, fp) == EOF);
}

inline File& File::read(void* x, int sz, int n)
{ 
  return failif (!readable() || (stat = fread(x, sz, n, fp)) != n);
} 

inline File& File::write(void* x, int sz, int n) 
{ 
  return failif (!writable() || (stat = fwrite(x, sz, n, fp)) != n);
}

inline File& File::flush()
{ 
  return failif(!is_open() || fflush(fp) == EOF);
}


inline File& File::seek(long pos, int seek_mode)
{ 
  return failif (!is_open() || fseek(fp, pos, seek_mode) < 0); 
}

inline long File::tell()
{ 
  failif (!is_open() || ((stat = ftell(fp)) < 0));
  return stat;
}

inline int File::rdstate()
{ 
  check_state();  return state; // check_state is necessary in rare but
}                               // possible circumstances

inline File::operator void*()
{ 
  check_state();  return (int(state) & (int(_bad)|int(_fail)))? 0 : this ; 
}

inline int File::eof()
{ 
  check_state(); return state & _eof; 
}

inline int File::fail()
{ 
  check_state(); return state & _fail; 
}

inline int File::bad()
{ 
  check_state(); return state & _bad; 
}

inline int File::good()
{ 
  check_state(); return rdstate() == _good; 
}


#endif

#endif