libgfortran/io/unix.h

   1 /* Copyright (C) 2009, 2010
   2    Free Software Foundation, Inc.
   3    Contributed by Janne Blomqvist
   4
   5 This file is part of the GNU Fortran runtime library (libgfortran).
   6
   7 Libgfortran is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 Libgfortran is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #ifndef GFOR_UNIX_H
  27 #define GFOR_UNIX_H
  28
  29 #include "io.h"
  30
  31
  32 struct stream
  33 {
  34   ssize_t (*read) (struct stream *, void *, ssize_t);
  35   ssize_t (*write) (struct stream *, const void *, ssize_t);
  36   gfc_offset (*seek) (struct stream *, gfc_offset, int);
  37   gfc_offset (*tell) (struct stream *);
  38   /* Avoid keyword truncate due to AIX namespace collision.  */
  39   int (*trunc) (struct stream *, gfc_offset);
  40   int (*flush) (struct stream *);
  41   int (*close) (struct stream *);
  42 };
  43
  44
  45 typedef struct
  46 {
  47   stream st;
  48
  49   gfc_offset buffer_offset;     /* File offset of the start of the buffer */
  50   gfc_offset physical_offset;   /* Current physical file offset */
  51   gfc_offset logical_offset;    /* Current logical file offset */
  52   gfc_offset file_length;       /* Length of the file, -1 if not seekable. */
  53
  54   char *buffer;                 /* Pointer to the buffer.  */
  55   int fd;                       /* The POSIX file descriptor.  */
  56
  57   int active;                   /* Length of valid bytes in the buffer */
  58
  59   int prot;
  60   int ndirty;                   /* Dirty bytes starting at buffer_offset */
  61
  62   int special_file;             /* =1 if the fd refers to a special file */
  63 }
  64 unix_stream;
  65
  66
  67 /* Inline functions for doing file I/O given a stream.  */
  68 static inline ssize_t
  69 sread (stream * s, void * buf, ssize_t nbyte)
  70 {
  71   return s->read (s, buf, nbyte);
  72 }
  73
  74 static inline ssize_t
  75 swrite (stream * s, const void * buf, ssize_t nbyte)
  76 {
  77   return s->write (s, buf, nbyte);
  78 }
  79
  80 static inline gfc_offset
  81 sseek (stream * s, gfc_offset offset, int whence)
  82 {
  83   return s->seek (s, offset, whence);
  84 }
  85
  86 static inline gfc_offset
  87 stell (stream * s)
  88 {
  89   return s->tell (s);
  90 }
  91
  92 static inline int
  93 struncate (stream * s, gfc_offset length)
  94 {
  95   return s->trunc (s, length);
  96 }
  97
  98 static inline int
  99 sflush (stream * s)
 100 {
 101   return s->flush (s);
 102 }
 103
 104 static inline int
 105 sclose (stream * s)
 106 {
 107   return s->close (s);
 108 }
 109
 110
 111 extern int compare_files (stream *, stream *);
 112 internal_proto(compare_files);
 113
 114 extern stream *open_external (st_parameter_open *, unit_flags *);
 115 internal_proto(open_external);
 116
 117 extern stream *open_internal (char *, int, gfc_offset);
 118 internal_proto(open_internal);
 119
 120 extern stream *open_internal4 (char *, int, gfc_offset);
 121 internal_proto(open_internal4);
 122
 123 extern char * mem_alloc_w (stream *, int *);
 124 internal_proto(mem_alloc_w);
 125
 126 extern char * mem_alloc_r (stream *, int *);
 127 internal_proto(mem_alloc_r);
 128
 129 extern gfc_char4_t * mem_alloc_w4 (stream *, int *);
 130 internal_proto(mem_alloc_w4);
 131
 132 extern char * mem_alloc_r4 (stream *, int *);
 133 internal_proto(mem_alloc_r4);
 134
 135 extern stream *input_stream (void);
 136 internal_proto(input_stream);
 137
 138 extern stream *output_stream (void);
 139 internal_proto(output_stream);
 140
 141 extern stream *error_stream (void);
 142 internal_proto(error_stream);
 143
 144 extern int compare_file_filename (gfc_unit *, const char *, int);
 145 internal_proto(compare_file_filename);
 146
 147 extern gfc_unit *find_file (const char *file, gfc_charlen_type file_len);
 148 internal_proto(find_file);
 149
 150 extern int delete_file (gfc_unit *);
 151 internal_proto(delete_file);
 152
 153 extern int file_exists (const char *file, gfc_charlen_type file_len);
 154 internal_proto(file_exists);
 155
 156 extern GFC_IO_INT file_size (const char *file, gfc_charlen_type file_len);
 157 internal_proto(file_size);
 158
 159 extern const char *inquire_sequential (const char *, int);
 160 internal_proto(inquire_sequential);
 161
 162 extern const char *inquire_direct (const char *, int);
 163 internal_proto(inquire_direct);
 164
 165 extern const char *inquire_formatted (const char *, int);
 166 internal_proto(inquire_formatted);
 167
 168 extern const char *inquire_unformatted (const char *, int);
 169 internal_proto(inquire_unformatted);
 170
 171 extern const char *inquire_read (const char *, int);
 172 internal_proto(inquire_read);
 173
 174 extern const char *inquire_write (const char *, int);
 175 internal_proto(inquire_write);
 176
 177 extern const char *inquire_readwrite (const char *, int);
 178 internal_proto(inquire_readwrite);
 179
 180 extern gfc_offset file_length (stream *);
 181 internal_proto(file_length);
 182
 183 extern int is_seekable (stream *);
 184 internal_proto(is_seekable);
 185
 186 extern int is_special (stream *);
 187 internal_proto(is_special);
 188
 189 extern void flush_if_preconnected (stream *);
 190 internal_proto(flush_if_preconnected);
 191
 192 extern void empty_internal_buffer(stream *);
 193 internal_proto(empty_internal_buffer);
 194
 195 extern int stream_isatty (stream *);
 196 internal_proto(stream_isatty);
 197
 198 extern char * stream_ttyname (stream *);
 199 internal_proto(stream_ttyname);
 200
 201 extern int unpack_filename (char *, const char *, int);
 202 internal_proto(unpack_filename);
 203
 204
 205 #endif