libgfortran/io/io.h

   1 /* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
   2    Contributed by Andy Vaught
   3
   4 This file is part of the GNU Fortran 95 runtime library (libgfortran).
   5
   6 Libgfortran is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 Libgfortran is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with Libgfortran; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef GFOR_IO_H
  22 #define GFOR_IO_H
  23
  24 /* IO library include.  */
  25
  26 #include <setjmp.h>
  27 #include "libgfortran.h"
  28 #define DEFAULT_TEMPDIR "/var/tmp"
  29
  30 /* Basic types used in data transfers.  */
  31
  32 typedef enum
  33 { BT_NULL, BT_INTEGER, BT_LOGICAL, BT_CHARACTER, BT_REAL,
  34   BT_COMPLEX
  35 }
  36 bt;
  37
  38
  39 typedef enum
  40 { SUCCESS = 1, FAILURE }
  41 try;
  42
  43 typedef struct stream
  44 {
  45   char *(*alloc_w_at) (struct stream *, int *, gfc_offset);
  46   char *(*alloc_r_at) (struct stream *, int *, gfc_offset);
  47     try (*sfree) (struct stream *);
  48     try (*close) (struct stream *);
  49     try (*seek) (struct stream *, gfc_offset);
  50     try (*truncate) (struct stream *);
  51 }
  52 stream;
  53
  54
  55 /* Macros for doing file I/O given a stream.  */
  56
  57 #define sfree(s) ((s)->sfree)(s)
  58 #define sclose(s) ((s)->close)(s)
  59
  60 #define salloc_r(s, len) ((s)->alloc_r_at)(s, len, -1)
  61 #define salloc_w(s, len) ((s)->alloc_w_at)(s, len, -1)
  62
  63 #define salloc_r_at(s, len, where) ((s)->alloc_r_at)(s, len, where)
  64 #define salloc_w_at(s, len, where) ((s)->alloc_w_at)(s, len, where)
  65
  66 #define sseek(s, pos) ((s)->seek)(s, pos)
  67 #define struncate(s) ((s)->truncate)(s)
  68
  69 /* Namelist represent object */
  70 /*
  71    Namelist Records
  72        &groupname  object=value [,object=value].../
  73      or
  74        &groupname  object=value [,object=value]...&groupname
  75
  76   Even more complex, during the execution of a program containing a
  77   namelist READ statement, you can specify a question mark character(?)
  78   or a question mark character preceded by an equal sign(=?) to get
  79   the information of the namelist group. By '?', the name of variables
  80   in the namelist will be displayed, by '=?', the name and value of
  81   variables will be displayed.
  82
  83   All these requirements need a new data structure to record all info
  84   about the namelist.
  85 */
  86
  87 typedef struct namelist_type
  88 {
  89   char * var_name;
  90   void * mem_pos;
  91   int  value_acquired;
  92   int len;
  93   int string_length;
  94   bt type;
  95   struct namelist_type * next;
  96 }
  97 namelist_info;
  98
  99 /* Options for the OPEN statement.  */
 100
 101 typedef enum
 102 { ACCESS_SEQUENTIAL, ACCESS_DIRECT,
 103   ACCESS_UNSPECIFIED
 104 }
 105 unit_access;
 106
 107 typedef enum
 108 { ACTION_READ, ACTION_WRITE, ACTION_READWRITE,
 109   ACTION_UNSPECIFIED
 110 }
 111 unit_action;
 112
 113 typedef enum
 114 { BLANK_NULL, BLANK_ZERO, BLANK_UNSPECIFIED }
 115 unit_blank;
 116
 117 typedef enum
 118 { DELIM_NONE, DELIM_APOSTROPHE, DELIM_QUOTE,
 119   DELIM_UNSPECIFIED
 120 }
 121 unit_delim;
 122
 123 typedef enum
 124 { FORM_FORMATTED, FORM_UNFORMATTED, FORM_UNSPECIFIED }
 125 unit_form;
 126
 127 typedef enum
 128 { POSITION_ASIS, POSITION_REWIND, POSITION_APPEND,
 129   POSITION_UNSPECIFIED
 130 }
 131 unit_position;
 132
 133 typedef enum
 134 { STATUS_UNKNOWN, STATUS_OLD, STATUS_NEW, STATUS_SCRATCH,
 135   STATUS_REPLACE, STATUS_UNSPECIFIED
 136 }
 137 unit_status;
 138
 139 typedef enum
 140 { PAD_YES, PAD_NO, PAD_UNSPECIFIED }
 141 unit_pad;
 142
 143 typedef enum
 144 { ADVANCE_YES, ADVANCE_NO, ADVANCE_UNSPECIFIED }
 145 unit_advance;
 146
 147 typedef enum
 148 {READING, WRITING}
 149 unit_mode;
 150
 151 /* Statement parameters.  These are all the things that can appear in
 152    an I/O statement.  Some are inputs and some are outputs, but none
 153    are both.  All of these values are initially zeroed and are zeroed
 154    at the end of a library statement.  The relevant values need to be
 155    set before entry to an I/O statement.  This structure needs to be
 156    duplicated by the back end.  */
 157
 158 typedef struct
 159 {
 160   int unit;
 161   int err, end, eor, list_format;       /* These are flags, not values.  */
 162
 163 /* Return values from library statements.  These are returned only if
 164    the labels are specified in the statement itself and the condition
 165    occurs.  In most cases, none of the labels are specified and the
 166    return value does not have to be checked.  Must be consistent with
 167    the front end.  */
 168
 169   enum
 170   {
 171     LIBRARY_OK = 0,
 172     LIBRARY_ERROR,
 173     LIBRARY_END,
 174     LIBRARY_EOR
 175   }
 176   library_return;
 177
 178   int *iostat, *exist, *opened, *number, *named, rec, *nextrec, *size;
 179
 180   int recl_in;
 181   int *recl_out;
 182
 183   int *iolength;
 184
 185   char *file;
 186   int file_len;
 187   char *status;
 188   int status_len;
 189   char *access;
 190   int access_len;
 191   char *form;
 192   int form_len;
 193   char *blank;
 194   int blank_len;
 195   char *position;
 196   int position_len;
 197   char *action;
 198   int action_len;
 199   char *delim;
 200   int delim_len;
 201   char *pad;
 202   int pad_len;
 203   char *format;
 204   int format_len;
 205   char *advance;
 206   int advance_len;
 207   char *name;
 208   int name_len;
 209   char *internal_unit;
 210   int internal_unit_len;
 211   char *sequential;
 212   int sequential_len;
 213   char *direct;
 214   int direct_len;
 215   char *formatted;
 216   int formatted_len;
 217   char *unformatted;
 218   int unformatted_len;
 219   char *read;
 220   int read_len;
 221   char *write;
 222   int write_len;
 223   char *readwrite;
 224   int readwrite_len;
 225
 226 /* namelist related data */
 227   char * namelist_name;
 228   int namelist_name_len;
 229   int namelist_read_mode;
 230 }
 231 st_parameter;
 232
 233
 234
 235 #define ioparm prefix(ioparm)
 236 extern st_parameter ioparm;
 237
 238 #define ionml prefix(ionml)
 239 extern namelist_info * ionml;
 240
 241 typedef struct
 242 {
 243   unit_access access;
 244   unit_action action;
 245   unit_blank blank;
 246   unit_delim delim;
 247   unit_form form;
 248   int is_notpadded;
 249   unit_position position;
 250   unit_status status;
 251   unit_pad pad;
 252 }
 253 unit_flags;
 254
 255
 256 /* The default value of record length is defined here.  This value can
 257    be overriden by the OPEN statement or by an environment variable.  */
 258
 259 #define DEFAULT_RECL 10000
 260
 261
 262 typedef struct gfc_unit
 263 {
 264   int unit_number;
 265
 266   stream *s;
 267
 268   struct gfc_unit *left, *right;        /* Treap links.  */
 269   int priority;
 270
 271   int read_bad, current_record;
 272   enum
 273   { NO_ENDFILE, AT_ENDFILE, AFTER_ENDFILE }
 274   endfile;
 275
 276   unit_mode  mode;
 277   unit_flags flags;
 278   gfc_offset recl, last_record, maxrec, bytes_left;
 279
 280   /* recl           -- Record length of the file.
 281      last_record    -- Last record number read or written
 282      maxrec         -- Maximum record number in a direct access file
 283      bytes_left     -- Bytes left in current record.  */
 284
 285   int file_len;
 286   char file[1];       /* Filename is allocated at the end of the structure.  */
 287 }
 288 gfc_unit;
 289
 290 /* Global variables.  Putting these in a structure makes it easier to
 291    maintain, particularly with the constraint of a prefix.  */
 292
 293 typedef struct
 294 {
 295   int in_library;       /* Nonzero if a library call is being processed.  */
 296   int size;     /* Bytes processed by the current data-transfer statement.  */
 297   gfc_offset max_offset;        /* Maximum file offset.  */
 298   int item_count;       /* Item number in a formatted data transfer.  */
 299   int reversion_flag;   /* Format reversion has occurred.  */
 300   int first_item;
 301
 302   gfc_unit *unit_root;
 303   int seen_dollar;
 304
 305   unit_mode  mode;
 306
 307   unit_blank blank_status;
 308   enum {SIGN_S, SIGN_SS, SIGN_SP} sign_status;
 309   int scale_factor;
 310   jmp_buf eof_jump;
 311 }
 312 global_t;
 313
 314
 315 #define g prefix(g)
 316 extern global_t g;
 317
 318
 319 #define current_unit prefix(current_unit)
 320 extern gfc_unit *current_unit;
 321
 322 /* Format tokens.  Only about half of these can be stored in the
 323    format nodes.  */
 324
 325 typedef enum
 326 {
 327   FMT_NONE = 0, FMT_UNKNOWN, FMT_SIGNED_INT, FMT_ZERO, FMT_POSINT, FMT_PERIOD,
 328   FMT_COMMA, FMT_COLON, FMT_SLASH, FMT_DOLLAR, FMT_T, FMT_TR, FMT_TL,
 329   FMT_LPAREN, FMT_RPAREN, FMT_X, FMT_S, FMT_SS, FMT_SP, FMT_STRING,
 330   FMT_BADSTRING, FMT_P, FMT_I, FMT_B, FMT_BN, FMT_BZ, FMT_O, FMT_Z, FMT_F,
 331   FMT_E, FMT_EN, FMT_ES, FMT_G, FMT_L, FMT_A, FMT_D, FMT_H, FMT_END
 332 }
 333 format_token;
 334
 335
 336 /* Format nodes.  A format string is converted into a tree of these
 337    structures, which is traversed as part of a data transfer statement.  */
 338
 339 typedef struct fnode
 340 {
 341   format_token format;
 342   int repeat;
 343   struct fnode *next;
 344   char *source;
 345
 346   union
 347   {
 348     struct
 349     {
 350       int w, d, e;
 351     }
 352     real;
 353
 354     struct
 355     {
 356       int length;
 357       char *p;
 358     }
 359     string;
 360
 361     struct
 362     {
 363       int w, m;
 364     }
 365     integer;
 366
 367     int w;
 368     int k;
 369     int r;
 370     int n;
 371
 372     struct fnode *child;
 373   }
 374   u;
 375
 376   /* Members for traversing the tree during data transfer.  */
 377
 378   int count;
 379   struct fnode *current;
 380
 381 }
 382 fnode;
 383
 384
 385 /* unix.c */
 386
 387 #define sys_exit prefix(sys_exit)
 388 void sys_exit (int) __attribute__ ((noreturn));
 389
 390 #define move_pos_offset prefix(move_pos_offset)
 391 int move_pos_offset (stream *, int);
 392
 393 #define get_oserror prefix(get_oserror)
 394 const char *get_oserror (void);
 395
 396 #define compare_files prefix(compare_files)
 397 int compare_files (stream *, stream *);
 398
 399 #define init_error_stream prefix(init_error_stream)
 400 stream *init_error_stream (void);
 401
 402 #define open_external prefix(open_external)
 403 stream *open_external (unit_action, unit_status);
 404
 405 #define open_internal prefix(open_internal)
 406 stream *open_internal (char *, int);
 407
 408 #define input_stream prefix(input_stream)
 409 stream *input_stream (void);
 410
 411 #define output_stream prefix(output_stream)
 412 stream *output_stream (void);
 413
 414 #define compare_file_filename prefix(compare_file_filename)
 415 int compare_file_filename (stream *, const char *, int);
 416
 417 #define find_file prefix(find_file)
 418 gfc_unit *find_file (void);
 419
 420 #define stream_at_bof prefix(stream_at_bof)
 421 int stream_at_bof (stream *);
 422
 423 #define stream_at_eof prefix(stream_at_eof)
 424 int stream_at_eof (stream *);
 425
 426 #define delete_file prefix(delete_file)
 427 int delete_file (gfc_unit *);
 428
 429 #define file_exists prefix(file_exists)
 430 int file_exists (void);
 431
 432 #define inquire_sequential prefix(inquire_sequential)
 433 const char *inquire_sequential (const char *, int);
 434
 435 #define inquire_direct prefix(inquire_direct)
 436 const char *inquire_direct (const char *, int);
 437
 438 #define inquire_formatted prefix(inquire_formatted)
 439 const char *inquire_formatted (const char *, int);
 440
 441 #define inquire_unformatted prefix(inquire_unformatted)
 442 const char *inquire_unformatted (const char *, int);
 443
 444 #define inquire_read prefix(inquire_read)
 445 const char *inquire_read (const char *, int);
 446
 447 #define inquire_write prefix(inquire_write)
 448 const char *inquire_write (const char *, int);
 449
 450 #define inquire_readwrite prefix(inquire_readwrite)
 451 const char *inquire_readwrite (const char *, int);
 452
 453 #define file_length prefix(file_length)
 454 gfc_offset file_length (stream *);
 455
 456 #define file_position prefix(file_position)
 457 gfc_offset file_position (stream *);
 458
 459 #define is_seekable prefix(is_seekable)
 460 int is_seekable (stream *);
 461
 462 #define empty_internal_buffer prefix(empty_internal_buffer)
 463 void empty_internal_buffer(stream *);
 464
 465 #define flush prefix(flush)
 466 try flush (stream *);
 467
 468
 469 /* unit.c */
 470
 471 #define insert_unit prefix(insert_unix)
 472 void insert_unit (gfc_unit *);
 473
 474 #define close_unit prefix(close_unit)
 475 int close_unit (gfc_unit *);
 476
 477 #define is_internal_unit prefix(is_internal_unit)
 478 int is_internal_unit (void);
 479
 480 #define find_unit prefix(find_unit)
 481 gfc_unit *find_unit (int);
 482
 483 #define get_unit prefix(get_unit)
 484 gfc_unit *get_unit (int);
 485
 486 /* open.c */
 487
 488 #define test_endfile prefix(test_endfile)
 489 void test_endfile (gfc_unit *);
 490
 491 #define new_unit prefix(new_unit)
 492 void new_unit (unit_flags *);
 493
 494 /* format.c */
 495
 496 #define parse_format prefix(parse_format)
 497 void parse_format (void);
 498
 499 #define next_format prefix(next_format)
 500 fnode *next_format (void);
 501
 502 #define unget_format prefix(unget_format)
 503 void unget_format (fnode *);
 504
 505 #define format_error prefix(format_error)
 506 void format_error (fnode *, const char *);
 507
 508 #define free_fnodes prefix(free_fnodes)
 509 void free_fnodes (void);
 510
 511 /* transfer.c */
 512
 513 #define SCRATCH_SIZE 300
 514
 515 #define scratch prefix(scratch)
 516 extern char scratch[];
 517
 518 #define type_name prefix(type_name)
 519 const char *type_name (bt);
 520
 521 #define read_block prefix(read_block)
 522 void *read_block (int *);
 523
 524 #define write_block prefix(write_block)
 525 void *write_block (int);
 526
 527 #define transfer_integer prefix(transfer_integer)
 528 void transfer_integer (void *, int);
 529
 530 #define transfer_real prefix(transfer_real)
 531 void transfer_real (void *, int);
 532
 533 #define transfer_logical prefix(transfer_logical)
 534 void transfer_logical (void *, int);
 535
 536 #define transfer_character prefix(transfer_character)
 537 void transfer_character (void *, int);
 538
 539 #define transfer_complex prefix(transfer_complex)
 540 void transfer_complex (void *, int);
 541
 542 #define next_record prefix(next_record)
 543 void next_record (int);
 544
 545 #define st_set_nml_var_int prefix(st_set_nml_var_int)
 546 void st_set_nml_var_int (void * , char * , int , int );
 547
 548 #define st_set_nml_var_float prefix(st_set_nml_var_float)
 549 void st_set_nml_var_float (void * , char * , int , int );
 550
 551 #define st_set_nml_var_char prefix(st_set_nml_var_char)
 552 void st_set_nml_var_char (void * , char * , int , int, gfc_charlen_type);
 553
 554 #define st_set_nml_var_complex prefix(st_set_nml_var_complex)
 555 void st_set_nml_var_complex (void * , char * , int , int );
 556
 557 #define st_set_nml_var_log prefix(st_set_nml_var_log)
 558 void st_set_nml_var_log (void * , char * , int , int );
 559
 560 /* read.c */
 561
 562 #define set_integer prefix(set_integer)
 563 void set_integer (void *, int64_t, int);
 564
 565 #define max_value prefix(max_value)
 566 uint64_t max_value (int, int);
 567
 568 #define convert_real prefix(convert_real)
 569 int convert_real (void *, const char *, int);
 570
 571 #define read_a prefix(read_a)
 572 void read_a (fnode *, char *, int);
 573
 574 #define read_f prefix(read_f)
 575 void read_f (fnode *, char *, int);
 576
 577 #define read_l prefix(read_l)
 578 void read_l (fnode *, char *, int);
 579
 580 #define read_x prefix(read_x)
 581 void read_x (fnode *);
 582
 583 #define read_radix prefix(read_radix)
 584 void read_radix (fnode *, char *, int, int);
 585
 586 #define read_decimal prefix(read_decimal)
 587 void read_decimal (fnode *, char *, int);
 588
 589 /* list_read.c */
 590
 591 #define list_formatted_read prefix(list_formatted_read)
 592 void list_formatted_read (bt, void *, int);
 593
 594 #define finish_list_read prefix(finish_list_read)
 595 void finish_list_read (void);
 596
 597 #define init_at_eol prefix(init_at_eol)
 598 void init_at_eol();
 599
 600 #define namelist_read prefix(namelist_read)
 601 void namelist_read();
 602
 603 #define namelist_write prefix(namelist_write)
 604 void namelist_write();
 605
 606 /* write.c */
 607
 608 #define write_a prefix(write_a)
 609 void write_a (fnode *, const char *, int);
 610
 611 #define write_b prefix(write_b)
 612 void write_b (fnode *, const char *, int);
 613
 614 #define write_d prefix(write_d)
 615 void write_d (fnode *, const char *, int);
 616
 617 #define write_e prefix(write_e)
 618 void write_e (fnode *, const char *, int);
 619
 620 #define write_en prefix(write_en)
 621 void write_en (fnode *, const char *, int);
 622
 623 #define write_es prefix(write_es)
 624 void write_es (fnode *, const char *, int);
 625
 626 #define write_f prefix(write_f)
 627 void write_f (fnode *, const char *, int);
 628
 629 #define write_i prefix(write_i)
 630 void write_i (fnode *, const char *, int);
 631
 632 #define write_l prefix(write_l)
 633 void write_l (fnode *, char *, int);
 634
 635 #define write_o prefix(write_o)
 636 void write_o (fnode *, const char *, int);
 637
 638 #define write_x prefix(write_x)
 639 void write_x (fnode *);
 640
 641 #define write_z prefix(write_z)
 642 void write_z (fnode *, const char *, int);
 643
 644 #define list_formatted_write prefix(list_formatted_write)
 645 void list_formatted_write (bt, void *, int);
 646
 647
 648 #define st_open prefix(st_open)
 649 #define st_close prefix(st_close)
 650 #define st_inquire prefix(st_inquire)
 651 #define st_iolength prefix(st_iolength)
 652 #define st_iolength_done prefix(st_iolength_done)
 653 #define st_rewind prefix(st_rewind)
 654 #define st_read prefix(st_read)
 655 #define st_read_done prefix(st_read_done)
 656 #define st_write prefix(st_write)
 657 #define st_write_done prefix(st_write_done)
 658 #define st_backspace prefix(st_backspace)
 659 #define st_endfile prefix(st_endfile)
 660
 661
 662 void __MAIN (void);
 663
 664 #endif