libgfortran/io/io.h

   1 /* Copyright (C) 2002-2017 Free Software Foundation, Inc.
   2    Contributed by Andy Vaught
   3    F2003 I/O support contributed by Jerry DeLisle
   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_IO_H
  27 #define GFOR_IO_H
  28
  29 /* IO library include.  */
  30
  31 #include "libgfortran.h"
  32
  33 #include <gthr.h>
  34
  35
  36 /* POSIX 2008 specifies that the extended locale stuff is found in
  37    locale.h, but some systems have them in xlocale.h.  */
  38
  39 #include <locale.h>
  40
  41 #ifdef HAVE_XLOCALE_H
  42 #include <xlocale.h>
  43 #endif
  44
  45
  46 /* Forward declarations.  */
  47 struct st_parameter_dt;
  48 typedef struct stream stream;
  49 struct fbuf;
  50 struct format_data;
  51 typedef struct fnode fnode;
  52 struct gfc_unit;
  53
  54 #ifdef HAVE_NEWLOCALE
  55 /* We have POSIX 2008 extended locale stuff.  */
  56 extern locale_t c_locale;
  57 internal_proto(c_locale);
  58 #else
  59 extern char* old_locale;
  60 internal_proto(old_locale);
  61 extern int old_locale_ctr;
  62 internal_proto(old_locale_ctr);
  63 extern __gthread_mutex_t old_locale_lock;
  64 internal_proto(old_locale_lock);
  65 #endif
  66
  67
  68 /* Macros for testing what kinds of I/O we are doing.  */
  69
  70 #define is_array_io(dtp) ((dtp)->internal_unit_desc)
  71
  72 #define is_internal_unit(dtp) ((dtp)->u.p.current_unit->internal_unit_kind)
  73
  74 #define is_stream_io(dtp) ((dtp)->u.p.current_unit->flags.access == ACCESS_STREAM)
  75
  76 #define is_char4_unit(dtp) ((dtp)->u.p.current_unit->internal_unit_kind == 4)
  77
  78 /* The array_loop_spec contains the variables for the loops over index ranges
  79    that are encountered.  */
  80
  81 typedef struct array_loop_spec
  82 {
  83   /* Index counter for this dimension.  */
  84   index_type idx;
  85
  86   /* Start for the index counter.  */
  87   index_type start;
  88
  89   /* End for the index counter.  */
  90   index_type end;
  91
  92   /* Step for the index counter.  */
  93   index_type step;
  94 }
  95 array_loop_spec;
  96
  97 /* User defined input/output iomsg length. */
  98
  99 #define IOMSG_LEN 256
 100
 101 /* Subroutine formatted_dtio (struct, unit, iotype, v_list, iostat,
 102                               iomsg, (_iotype), (_iomsg))  */
 103 typedef void (*formatted_dtio)(void *, GFC_INTEGER_4 *, char *, gfc_array_i4 *,
 104                                GFC_INTEGER_4 *, char *,
 105                                gfc_charlen_type, gfc_charlen_type);
 106
 107 /* Subroutine unformatted_dtio (struct, unit, iostat, iomsg, (_iomsg))  */
 108 typedef void (*unformatted_dtio)(void *, GFC_INTEGER_4 *, GFC_INTEGER_4 *,
 109                                  char *, gfc_charlen_type);
 110
 111 /* The dtio calls for namelist require a CLASS object to be built.  */
 112 typedef struct gfc_class
 113 {
 114   void *data;
 115   void *vptr;
 116   index_type len;
 117 }
 118 gfc_class;
 119
 120
 121 /* A structure to build a hash table for format data.  */
 122
 123 #define FORMAT_HASH_SIZE 16
 124
 125 typedef struct format_hash_entry
 126 {
 127   char *key;
 128   gfc_charlen_type key_len;
 129   struct format_data *hashed_fmt;
 130 }
 131 format_hash_entry;
 132
 133 /* Representation of a namelist object in libgfortran
 134
 135    Namelist Records
 136       &GROUPNAME  OBJECT=value[s] [,OBJECT=value[s]].../
 137      or
 138       &GROUPNAME  OBJECT=value[s] [,OBJECT=value[s]]...&END
 139
 140    The object can be a fully qualified, compound name for an intrinsic
 141    type, derived types or derived type components.  So, a substring
 142    a(:)%b(4)%ch(2:4)(1:7) has to be treated correctly in namelist
 143    read. Hence full information about the structure of the object has
 144    to be available to list_read.c and write.
 145
 146    These requirements are met by the following data structures.
 147
 148    namelist_info type contains all the scalar information about the
 149    object and arrays of descriptor_dimension and array_loop_spec types for
 150    arrays.  */
 151
 152 typedef struct namelist_type
 153 {
 154   /* Object type.  */
 155   bt type;
 156
 157   /* Object name.  */
 158   char * var_name;
 159
 160   /* Address for the start of the object's data.  */
 161   void * mem_pos;
 162
 163   /* Address of specific DTIO subroutine.  */
 164   void * dtio_sub;
 165
 166   /* Address of vtable if dtio_sub non-null.  */
 167   void * vtable;
 168
 169   /* Flag to show that a read is to be attempted for this node.  */
 170   int touched;
 171
 172   /* Length of intrinsic type in bytes.  */
 173   int len;
 174
 175   /* Rank of the object.  */
 176   int var_rank;
 177
 178   /* Overall size of the object in bytes.  */
 179   index_type size;
 180
 181   /* Length of character string.  */
 182   index_type string_length;
 183
 184   descriptor_dimension * dim;
 185   array_loop_spec * ls;
 186   struct namelist_type * next;
 187 }
 188 namelist_info;
 189
 190 /* Options for the OPEN statement.  */
 191
 192 typedef enum
 193 { ACCESS_SEQUENTIAL, ACCESS_DIRECT, ACCESS_APPEND, ACCESS_STREAM,
 194   ACCESS_UNSPECIFIED
 195 }
 196 unit_access;
 197
 198 typedef enum
 199 { ACTION_READ, ACTION_WRITE, ACTION_READWRITE,
 200   ACTION_UNSPECIFIED
 201 }
 202 unit_action;
 203
 204 typedef enum
 205 { BLANK_NULL, BLANK_ZERO, BLANK_UNSPECIFIED }
 206 unit_blank;
 207
 208 typedef enum
 209 { DELIM_NONE, DELIM_APOSTROPHE, DELIM_QUOTE,
 210   DELIM_UNSPECIFIED
 211 }
 212 unit_delim;
 213
 214 typedef enum
 215 { FORM_FORMATTED, FORM_UNFORMATTED, FORM_UNSPECIFIED }
 216 unit_form;
 217
 218 typedef enum
 219 { POSITION_ASIS, POSITION_REWIND, POSITION_APPEND,
 220   POSITION_UNSPECIFIED
 221 }
 222 unit_position;
 223
 224 typedef enum
 225 { STATUS_UNKNOWN, STATUS_OLD, STATUS_NEW, STATUS_SCRATCH,
 226   STATUS_REPLACE, STATUS_UNSPECIFIED
 227 }
 228 unit_status;
 229
 230 typedef enum
 231 { PAD_YES, PAD_NO, PAD_UNSPECIFIED }
 232 unit_pad;
 233
 234 typedef enum
 235 { DECIMAL_POINT, DECIMAL_COMMA, DECIMAL_UNSPECIFIED }
 236 unit_decimal;
 237
 238 typedef enum
 239 { ENCODING_UTF8, ENCODING_DEFAULT, ENCODING_UNSPECIFIED }
 240 unit_encoding;
 241
 242 typedef enum
 243 { ROUND_UP = GFC_FPE_UPWARD,
 244   ROUND_DOWN = GFC_FPE_DOWNWARD,
 245   ROUND_ZERO = GFC_FPE_TOWARDZERO,
 246   ROUND_NEAREST = GFC_FPE_TONEAREST,
 247   ROUND_COMPATIBLE = 10, /* round away from zero.  */
 248   ROUND_PROCDEFINED, /* Here as ROUND_NEAREST. */
 249   ROUND_UNSPECIFIED /* Should never occur. */
 250 }
 251 unit_round;
 252
 253 /* NOTE: unit_sign must correspond with the sign_status enumerator in
 254    st_parameter_dt to not break the ABI.  */
 255 typedef enum
 256 { SIGN_PROCDEFINED, SIGN_SUPPRESS, SIGN_PLUS, SIGN_UNSPECIFIED }
 257 unit_sign;
 258
 259 typedef enum
 260 { ADVANCE_YES, ADVANCE_NO, ADVANCE_UNSPECIFIED }
 261 unit_advance;
 262
 263 typedef enum
 264 {READING, WRITING, LIST_READING, LIST_WRITING}
 265 unit_mode;
 266
 267 typedef enum
 268 { ASYNC_YES, ASYNC_NO, ASYNC_UNSPECIFIED }
 269 unit_async;
 270
 271 typedef enum
 272 { SHARE_DENYRW, SHARE_DENYNONE,
 273   SHARE_UNSPECIFIED
 274 }
 275 unit_share;
 276
 277 typedef enum
 278 { CC_LIST, CC_FORTRAN, CC_NONE,
 279   CC_UNSPECIFIED
 280 }
 281 unit_cc;
 282
 283 /* End-of-record types for CC_FORTRAN.  */
 284 typedef enum
 285 { CCF_DEFAULT=0x0,
 286   CCF_OVERPRINT=0x1,
 287   CCF_ONE_LF=0x2,
 288   CCF_TWO_LF=0x4,
 289   CCF_PAGE_FEED=0x8,
 290   CCF_PROMPT=0x10,
 291   CCF_OVERPRINT_NOA=0x20,
 292 } /* 6 bits */
 293 cc_fortran;
 294
 295 typedef enum
 296 { SIGN_S, SIGN_SS, SIGN_SP }
 297 unit_sign_s;
 298
 299 /* Make sure to keep st_parameter_* in sync with gcc/fortran/ioparm.def.  */
 300
 301 #define CHARACTER1(name) \
 302               char * name; \
 303               gfc_charlen_type name ## _len
 304 #define CHARACTER2(name) \
 305               gfc_charlen_type name ## _len; \
 306               char * name
 307
 308 typedef struct
 309 {
 310   st_parameter_common common;
 311   GFC_IO_INT recl_in;
 312   CHARACTER2 (file);
 313   CHARACTER1 (status);
 314   CHARACTER2 (access);
 315   CHARACTER1 (form);
 316   CHARACTER2 (blank);
 317   CHARACTER1 (position);
 318   CHARACTER2 (action);
 319   CHARACTER1 (delim);
 320   CHARACTER2 (pad);
 321   CHARACTER1 (convert);
 322   CHARACTER2 (decimal);
 323   CHARACTER1 (encoding);
 324   CHARACTER2 (round);
 325   CHARACTER1 (sign);
 326   CHARACTER2 (asynchronous);
 327   GFC_INTEGER_4 *newunit;
 328   GFC_INTEGER_4 readonly;
 329   CHARACTER2 (cc);
 330   CHARACTER1 (share);
 331 }
 332 st_parameter_open;
 333
 334 #define IOPARM_CLOSE_HAS_STATUS         (1 << 7)
 335
 336 typedef struct
 337 {
 338   st_parameter_common common;
 339   CHARACTER1 (status);
 340 }
 341 st_parameter_close;
 342
 343 typedef struct
 344 {
 345   st_parameter_common common;
 346 }
 347 st_parameter_filepos;
 348
 349 #define IOPARM_INQUIRE_HAS_EXIST        (1 << 7)
 350 #define IOPARM_INQUIRE_HAS_OPENED       (1 << 8)
 351 #define IOPARM_INQUIRE_HAS_NUMBER       (1 << 9)
 352 #define IOPARM_INQUIRE_HAS_NAMED        (1 << 10)
 353 #define IOPARM_INQUIRE_HAS_NEXTREC      (1 << 11)
 354 #define IOPARM_INQUIRE_HAS_RECL_OUT     (1 << 12)
 355 #define IOPARM_INQUIRE_HAS_STRM_POS_OUT (1 << 13)
 356 #define IOPARM_INQUIRE_HAS_FILE         (1 << 14)
 357 #define IOPARM_INQUIRE_HAS_ACCESS       (1 << 15)
 358 #define IOPARM_INQUIRE_HAS_FORM         (1 << 16)
 359 #define IOPARM_INQUIRE_HAS_BLANK        (1 << 17)
 360 #define IOPARM_INQUIRE_HAS_POSITION     (1 << 18)
 361 #define IOPARM_INQUIRE_HAS_ACTION       (1 << 19)
 362 #define IOPARM_INQUIRE_HAS_DELIM        (1 << 20)
 363 #define IOPARM_INQUIRE_HAS_PAD          (1 << 21)
 364 #define IOPARM_INQUIRE_HAS_NAME         (1 << 22)
 365 #define IOPARM_INQUIRE_HAS_SEQUENTIAL   (1 << 23)
 366 #define IOPARM_INQUIRE_HAS_DIRECT       (1 << 24)
 367 #define IOPARM_INQUIRE_HAS_FORMATTED    (1 << 25)
 368 #define IOPARM_INQUIRE_HAS_UNFORMATTED  (1 << 26)
 369 #define IOPARM_INQUIRE_HAS_READ         (1 << 27)
 370 #define IOPARM_INQUIRE_HAS_WRITE        (1 << 28)
 371 #define IOPARM_INQUIRE_HAS_READWRITE    (1 << 29)
 372 #define IOPARM_INQUIRE_HAS_CONVERT      (1 << 30)
 373 #define IOPARM_INQUIRE_HAS_FLAGS2       (1u << 31)
 374
 375 #define IOPARM_INQUIRE_HAS_ASYNCHRONOUS (1 << 0)
 376 #define IOPARM_INQUIRE_HAS_DECIMAL      (1 << 1)
 377 #define IOPARM_INQUIRE_HAS_ENCODING     (1 << 2)
 378 #define IOPARM_INQUIRE_HAS_ROUND        (1 << 3)
 379 #define IOPARM_INQUIRE_HAS_SIGN         (1 << 4)
 380 #define IOPARM_INQUIRE_HAS_PENDING      (1 << 5)
 381 #define IOPARM_INQUIRE_HAS_SIZE         (1 << 6)
 382 #define IOPARM_INQUIRE_HAS_ID           (1 << 7)
 383 #define IOPARM_INQUIRE_HAS_IQSTREAM     (1 << 8)
 384 #define IOPARM_INQUIRE_HAS_SHARE        (1 << 9)
 385 #define IOPARM_INQUIRE_HAS_CC           (1 << 10)
 386
 387 typedef struct
 388 {
 389   st_parameter_common common;
 390   GFC_INTEGER_4 *exist, *opened, *number, *named;
 391   GFC_IO_INT *nextrec, *recl_out, *strm_pos_out;
 392   CHARACTER1 (file);
 393   CHARACTER2 (access);
 394   CHARACTER1 (form);
 395   CHARACTER2 (blank);
 396   CHARACTER1 (position);
 397   CHARACTER2 (action);
 398   CHARACTER1 (delim);
 399   CHARACTER2 (pad);
 400   CHARACTER1 (name);
 401   CHARACTER2 (sequential);
 402   CHARACTER1 (direct);
 403   CHARACTER2 (formatted);
 404   CHARACTER1 (unformatted);
 405   CHARACTER2 (read);
 406   CHARACTER1 (write);
 407   CHARACTER2 (readwrite);
 408   CHARACTER1 (convert);
 409   GFC_INTEGER_4 flags2;
 410   CHARACTER1 (asynchronous);
 411   CHARACTER2 (decimal);
 412   CHARACTER1 (encoding);
 413   CHARACTER2 (round);
 414   CHARACTER1 (sign);
 415   GFC_INTEGER_4 *pending;
 416   GFC_IO_INT *size;
 417   GFC_INTEGER_4 *id;
 418   CHARACTER1 (iqstream);
 419   CHARACTER2 (share);
 420   CHARACTER1 (cc);
 421 }
 422 st_parameter_inquire;
 423
 424
 425 #define IOPARM_DT_LIST_FORMAT                   (1 << 7)
 426 #define IOPARM_DT_NAMELIST_READ_MODE            (1 << 8)
 427 #define IOPARM_DT_HAS_REC                       (1 << 9)
 428 #define IOPARM_DT_HAS_SIZE                      (1 << 10)
 429 #define IOPARM_DT_HAS_IOLENGTH                  (1 << 11)
 430 #define IOPARM_DT_HAS_FORMAT                    (1 << 12)
 431 #define IOPARM_DT_HAS_ADVANCE                   (1 << 13)
 432 #define IOPARM_DT_HAS_INTERNAL_UNIT             (1 << 14)
 433 #define IOPARM_DT_HAS_NAMELIST_NAME             (1 << 15)
 434 #define IOPARM_DT_HAS_ID                        (1 << 16)
 435 #define IOPARM_DT_HAS_POS                       (1 << 17)
 436 #define IOPARM_DT_HAS_ASYNCHRONOUS              (1 << 18)
 437 #define IOPARM_DT_HAS_BLANK                     (1 << 19)
 438 #define IOPARM_DT_HAS_DECIMAL                   (1 << 20)
 439 #define IOPARM_DT_HAS_DELIM                     (1 << 21)
 440 #define IOPARM_DT_HAS_PAD                       (1 << 22)
 441 #define IOPARM_DT_HAS_ROUND                     (1 << 23)
 442 #define IOPARM_DT_HAS_SIGN                      (1 << 24)
 443 #define IOPARM_DT_HAS_F2003                     (1 << 25)
 444 #define IOPARM_DT_HAS_UDTIO                     (1 << 26)
 445 #define IOPARM_DT_DEFAULT_EXP                   (1 << 27)
 446 /* Internal use bit.  */
 447 #define IOPARM_DT_IONML_SET                     (1u << 31)
 448
 449
 450 typedef struct st_parameter_dt
 451 {
 452   st_parameter_common common;
 453   GFC_IO_INT rec;
 454   GFC_IO_INT *size, *iolength;
 455   gfc_array_char *internal_unit_desc;
 456   CHARACTER1 (format);
 457   CHARACTER2 (advance);
 458   CHARACTER1 (internal_unit);
 459   CHARACTER2 (namelist_name);
 460   GFC_INTEGER_4 *id;
 461   GFC_IO_INT pos;
 462   CHARACTER1 (asynchronous);
 463   CHARACTER2 (blank);
 464   CHARACTER1 (decimal);
 465   CHARACTER2 (delim);
 466   CHARACTER1 (pad);
 467   CHARACTER2 (round);
 468   CHARACTER1 (sign);
 469   /* Private part of the structure.  The compiler just needs
 470      to reserve enough space.  */
 471   union
 472     {
 473       struct
 474         {
 475           void (*transfer) (struct st_parameter_dt *, bt, void *, int,
 476                             size_t, size_t);
 477           struct gfc_unit *current_unit;
 478           /* Item number in a formatted data transfer.  Also used in namelist
 479              read_logical as an index into line_buffer.  */
 480           int item_count;
 481           unit_mode mode;
 482           unit_blank blank_status;
 483           unit_sign sign_status;
 484           int scale_factor;
 485           /* Maximum righthand column written to.  */
 486           int max_pos;
 487           /* Number of skips + spaces to be done for T and X-editing.  */
 488           int skips;
 489           /* Number of spaces to be done for T and X-editing.  */
 490           int pending_spaces;
 491           /* Whether an EOR condition was encountered. Value is:
 492                0 if no EOR was encountered
 493                1 if an EOR was encountered due to a 1-byte marker (LF)
 494                2 if an EOR was encountered due to a 2-bytes marker (CRLF) */
 495           int sf_seen_eor;
 496           unit_advance advance_status;
 497           unsigned reversion_flag : 1; /* Format reversion has occurred.  */
 498           unsigned first_item : 1;
 499           unsigned seen_dollar : 1;
 500           unsigned eor_condition : 1;
 501           unsigned no_leading_blank : 1;
 502           unsigned char_flag : 1;
 503           unsigned input_complete : 1;
 504           unsigned at_eol : 1;
 505           unsigned comma_flag : 1;
 506           /* A namelist specific flag used in the list directed library
 507              to flag that calls are being made from namelist read (e.g. to
 508              ignore comments or to treat '/' as a terminator)  */
 509           unsigned namelist_mode : 1;
 510           /* A namelist specific flag used in the list directed library
 511              to flag read errors and return, so that an attempt can be
 512              made to read a new object name.  */
 513           unsigned nml_read_error : 1;
 514           /* A sequential formatted read specific flag used to signal that a
 515              character string is being read so don't use commas to shorten a
 516              formatted field width.  */
 517           unsigned sf_read_comma : 1;
 518           /* A namelist specific flag used to enable reading input from
 519              line_buffer for logical reads.  */
 520           unsigned line_buffer_enabled : 1;
 521           /* An internal unit specific flag used to identify that the associated
 522              unit is internal.  */
 523           unsigned unit_is_internal : 1;
 524           /* An internal unit specific flag to signify an EOF condition for list
 525              directed read.  */
 526           unsigned at_eof : 1;
 527           /* Used for g0 floating point output.  */
 528           unsigned g0_no_blanks : 1;
 529           /* Used to signal use of free_format_data.  */
 530           unsigned format_not_saved : 1;
 531           /* A flag used to identify when a non-standard expanded namelist read
 532              has occurred.  */
 533           unsigned expanded_read : 1;
 534           /* 13 unused bits.  */
 535
 536           int child_saved_iostat;
 537           int nml_delim;
 538           int repeat_count;
 539           int saved_length;
 540           int saved_used;
 541           bt saved_type;
 542           char *saved_string;
 543           char *scratch;
 544           char *line_buffer;
 545           struct format_data *fmt;
 546           namelist_info *ionml;
 547 #ifdef HAVE_NEWLOCALE
 548           locale_t old_locale;
 549 #endif
 550           /* Current position within the look-ahead line buffer.  */
 551           int line_buffer_pos;
 552           /* Storage area for values except for strings.  Must be
 553              large enough to hold a complex value (two reals) of the
 554              largest kind.  */
 555           char value[32];
 556           GFC_IO_INT not_used; /* Needed for alignment. */
 557           formatted_dtio fdtio_ptr;
 558           unformatted_dtio ufdtio_ptr;
 559           /* With CC_FORTRAN, the first character of a record determines the
 560              style of record end (and start) to use. We must mark down the type
 561              when we write first in write_a so we remember the end type later in
 562              next_record_w.  */
 563           struct
 564             {
 565               unsigned type : 6; /* See enum cc_fortran.  */
 566               unsigned len  : 2; /* Always 0, 1, or 2.  */
 567               /* The union is updated after start-of-record is written.  */
 568               union
 569                 {
 570                   char start; /* Output character for start of record.  */
 571                   char end;   /* Output character for end of record.  */
 572                 } u;
 573             } cc;
 574         } p;
 575       /* This pad size must be equal to the pad_size declared in
 576          trans-io.c (gfc_build_io_library_fndecls).  The above structure
 577          must be smaller or equal to this array.  */
 578       char pad[16 * sizeof (char *) + 32 * sizeof (int)];
 579     } u;
 580 }
 581 st_parameter_dt;
 582
 583 /* Ensure st_parameter_dt's u.pad is bigger or equal to u.p.  */
 584 extern char check_st_parameter_dt[sizeof (((st_parameter_dt *) 0)->u.pad)
 585                                   >= sizeof (((st_parameter_dt *) 0)->u.p)
 586                                   ? 1 : -1];
 587
 588 #define IOPARM_WAIT_HAS_ID              (1 << 7)
 589
 590 typedef struct
 591 {
 592   st_parameter_common common;
 593   CHARACTER1 (id);
 594 }
 595 st_parameter_wait;
 596
 597
 598 #undef CHARACTER1
 599 #undef CHARACTER2
 600
 601 typedef struct
 602 {
 603   unit_access access;
 604   unit_action action;
 605   unit_blank blank;
 606   unit_delim delim;
 607   unit_form form;
 608   int is_notpadded;
 609   unit_position position;
 610   unit_status status;
 611   unit_pad pad;
 612   unit_convert convert;
 613   int has_recl;
 614   unit_decimal decimal;
 615   unit_encoding encoding;
 616   unit_round round;
 617   unit_sign sign;
 618   unit_async async;
 619   unit_share share;
 620   unit_cc cc;
 621   int readonly;
 622 }
 623 unit_flags;
 624
 625
 626 typedef struct gfc_unit
 627 {
 628   int unit_number;
 629   stream *s;
 630
 631   /* Treap links.  */
 632   struct gfc_unit *left, *right;
 633   int priority;
 634
 635   int read_bad, current_record, saved_pos, previous_nonadvancing_write;
 636
 637   enum
 638   { NO_ENDFILE, AT_ENDFILE, AFTER_ENDFILE }
 639   endfile;
 640
 641   unit_mode mode;
 642   unit_flags flags;
 643   unit_pad pad_status;
 644   unit_decimal decimal_status;
 645   unit_delim delim_status;
 646   unit_round round_status;
 647
 648   /* recl                 -- Record length of the file.
 649      last_record          -- Last record number read or written
 650      maxrec               -- Maximum record number in a direct access file
 651      bytes_left           -- Bytes left in current record.
 652      strm_pos             -- Current position in file for STREAM I/O.
 653      recl_subrecord       -- Maximum length for subrecord.
 654      bytes_left_subrecord -- Bytes left in current subrecord.  */
 655   gfc_offset recl, last_record, maxrec, bytes_left, strm_pos,
 656     recl_subrecord, bytes_left_subrecord;
 657
 658   /* Set to 1 if we have read a subrecord.  */
 659
 660   int continued;
 661
 662   __gthread_mutex_t lock;
 663   /* Number of threads waiting to acquire this unit's lock.
 664      When non-zero, close_unit doesn't only removes the unit
 665      from the UNIT_ROOT tree, but doesn't free it and the
 666      last of the waiting threads will do that.
 667      This must be either atomically increased/decreased, or
 668      always guarded by UNIT_LOCK.  */
 669   int waiting;
 670   /* Flag set by close_unit if the unit as been closed.
 671      Must be manipulated under unit's lock.  */
 672   int closed;
 673
 674   /* For traversing arrays */
 675   array_loop_spec *ls;
 676   int rank;
 677
 678   /* Name of the file at the time OPEN was executed, as a
 679      null-terminated C string.  */
 680   char *filename;
 681
 682   /* The format hash table.  */
 683   struct format_hash_entry format_hash_table[FORMAT_HASH_SIZE];
 684
 685   /* Formatting buffer.  */
 686   struct fbuf *fbuf;
 687
 688   /* Function pointer, points to list_read worker functions.  */
 689   int (*next_char_fn_ptr) (st_parameter_dt *);
 690   void (*push_char_fn_ptr) (st_parameter_dt *, int);
 691
 692   /* Internal unit char string data.  */
 693   char * internal_unit;
 694   gfc_charlen_type internal_unit_len;
 695   gfc_array_char *string_unit_desc;
 696   int internal_unit_kind;
 697
 698   /* DTIO Parent/Child procedure, 0 = parent, >0 = child level.  */
 699   int child_dtio;
 700
 701   /* Used for ungetc() style functionality. Possible values
 702      are an unsigned char, EOF, or EOF - 1 used to mark the
 703      field as not valid.  */
 704   int last_char;
 705   bool has_size;
 706   GFC_IO_INT size_used;
 707 }
 708 gfc_unit;
 709
 710 typedef struct gfc_saved_unit
 711 {
 712   GFC_INTEGER_4 unit_number;
 713   gfc_unit *unit;
 714 }
 715 gfc_saved_unit;
 716
 717 /* TEMP_FAILURE_RETRY macro from glibc.  */
 718
 719 #ifndef TEMP_FAILURE_RETRY
 720 /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
 721    set to EINTR.  */
 722
 723 # define TEMP_FAILURE_RETRY(expression) \
 724   (__extension__                                                              \
 725     ({ long int __result;                                                     \
 726        do __result = (long int) (expression);                                 \
 727        while (__result == -1L && errno == EINTR);                             \
 728        __result; }))
 729 #endif
 730
 731
 732 /* unit.c */
 733
 734 /* Maximum file offset, computed at library initialization time.  */
 735 extern gfc_offset max_offset;
 736 internal_proto(max_offset);
 737
 738 /* Unit tree root.  */
 739 extern gfc_unit *unit_root;
 740 internal_proto(unit_root);
 741
 742 extern __gthread_mutex_t unit_lock;
 743 internal_proto(unit_lock);
 744
 745 extern int close_unit (gfc_unit *);
 746 internal_proto(close_unit);
 747
 748 extern gfc_unit *set_internal_unit (st_parameter_dt *, gfc_unit *, int);
 749 internal_proto(set_internal_unit);
 750
 751 extern void stash_internal_unit (st_parameter_dt *);
 752 internal_proto(stash_internal_unit);
 753
 754 extern gfc_unit *find_unit (int);
 755 internal_proto(find_unit);
 756
 757 extern gfc_unit *find_or_create_unit (int);
 758 internal_proto(find_or_create_unit);
 759
 760 extern gfc_unit *get_unit (st_parameter_dt *, int);
 761 internal_proto(get_unit);
 762
 763 extern void unlock_unit(gfc_unit *);
 764 internal_proto(unlock_unit);
 765
 766 extern void finish_last_advance_record (gfc_unit *u);
 767 internal_proto(finish_last_advance_record);
 768
 769 extern int unit_truncate(gfc_unit *, gfc_offset, st_parameter_common *);
 770 internal_proto(unit_truncate);
 771
 772 extern int newunit_alloc (void);
 773 internal_proto(newunit_alloc);
 774
 775 extern void newunit_free (int);
 776 internal_proto(newunit_free);
 777
 778
 779 /* open.c */
 780
 781 extern gfc_unit *new_unit (st_parameter_open *, gfc_unit *, unit_flags *);
 782 internal_proto(new_unit);
 783
 784
 785 /* transfer.c */
 786
 787 #define SCRATCH_SIZE 300
 788
 789 extern const char *type_name (bt);
 790 internal_proto(type_name);
 791
 792 extern void * read_block_form (st_parameter_dt *, int *);
 793 internal_proto(read_block_form);
 794
 795 extern void * read_block_form4 (st_parameter_dt *, int *);
 796 internal_proto(read_block_form4);
 797
 798 extern void *write_block (st_parameter_dt *, int);
 799 internal_proto(write_block);
 800
 801 extern gfc_offset next_array_record (st_parameter_dt *, array_loop_spec *,
 802                                      int*);
 803 internal_proto(next_array_record);
 804
 805 extern gfc_offset init_loop_spec (gfc_array_char *, array_loop_spec *,
 806                                   gfc_offset *);
 807 internal_proto(init_loop_spec);
 808
 809 extern void next_record (st_parameter_dt *, int);
 810 internal_proto(next_record);
 811
 812 extern void st_wait (st_parameter_wait *);
 813 export_proto(st_wait);
 814
 815 extern void hit_eof (st_parameter_dt *);
 816 internal_proto(hit_eof);
 817
 818 /* read.c */
 819
 820 extern void set_integer (void *, GFC_INTEGER_LARGEST, int);
 821 internal_proto(set_integer);
 822
 823 extern GFC_UINTEGER_LARGEST si_max (int);
 824 internal_proto(si_max);
 825
 826 extern int convert_real (st_parameter_dt *, void *, const char *, int);
 827 internal_proto(convert_real);
 828
 829 extern int convert_infnan (st_parameter_dt *, void *, const char *, int);
 830 internal_proto(convert_infnan);
 831
 832 extern void read_a (st_parameter_dt *, const fnode *, char *, int);
 833 internal_proto(read_a);
 834
 835 extern void read_a_char4 (st_parameter_dt *, const fnode *, char *, int);
 836 internal_proto(read_a);
 837
 838 extern void read_f (st_parameter_dt *, const fnode *, char *, int);
 839 internal_proto(read_f);
 840
 841 extern void read_l (st_parameter_dt *, const fnode *, char *, int);
 842 internal_proto(read_l);
 843
 844 extern void read_x (st_parameter_dt *, int);
 845 internal_proto(read_x);
 846
 847 extern void read_radix (st_parameter_dt *, const fnode *, char *, int, int);
 848 internal_proto(read_radix);
 849
 850 extern void read_decimal (st_parameter_dt *, const fnode *, char *, int);
 851 internal_proto(read_decimal);
 852
 853 extern void read_user_defined (st_parameter_dt *, void *);
 854 internal_proto(read_user_defined);
 855
 856 extern void read_user_defined (st_parameter_dt *, void *);
 857 internal_proto(read_user_defined);
 858
 859 /* list_read.c */
 860
 861 extern void list_formatted_read (st_parameter_dt *, bt, void *, int, size_t,
 862                                  size_t);
 863 internal_proto(list_formatted_read);
 864
 865 extern void finish_list_read (st_parameter_dt *);
 866 internal_proto(finish_list_read);
 867
 868 extern void namelist_read (st_parameter_dt *);
 869 internal_proto(namelist_read);
 870
 871 extern void namelist_write (st_parameter_dt *);
 872 internal_proto(namelist_write);
 873
 874 /* write.c */
 875
 876 extern void write_a (st_parameter_dt *, const fnode *, const char *, int);
 877 internal_proto(write_a);
 878
 879 extern void write_a_char4 (st_parameter_dt *, const fnode *, const char *, int);
 880 internal_proto(write_a_char4);
 881
 882 extern void write_b (st_parameter_dt *, const fnode *, const char *, int);
 883 internal_proto(write_b);
 884
 885 extern void write_d (st_parameter_dt *, const fnode *, const char *, int);
 886 internal_proto(write_d);
 887
 888 extern void write_e (st_parameter_dt *, const fnode *, const char *, int);
 889 internal_proto(write_e);
 890
 891 extern void write_en (st_parameter_dt *, const fnode *, const char *, int);
 892 internal_proto(write_en);
 893
 894 extern void write_es (st_parameter_dt *, const fnode *, const char *, int);
 895 internal_proto(write_es);
 896
 897 extern void write_f (st_parameter_dt *, const fnode *, const char *, int);
 898 internal_proto(write_f);
 899
 900 extern void write_i (st_parameter_dt *, const fnode *, const char *, int);
 901 internal_proto(write_i);
 902
 903 extern void write_l (st_parameter_dt *, const fnode *, char *, int);
 904 internal_proto(write_l);
 905
 906 extern void write_o (st_parameter_dt *, const fnode *, const char *, int);
 907 internal_proto(write_o);
 908
 909 extern void write_real (st_parameter_dt *, const char *, int);
 910 internal_proto(write_real);
 911
 912 extern void write_real_g0 (st_parameter_dt *, const char *, int, int);
 913 internal_proto(write_real_g0);
 914
 915 extern void write_x (st_parameter_dt *, int, int);
 916 internal_proto(write_x);
 917
 918 extern void write_z (st_parameter_dt *, const fnode *, const char *, int);
 919 internal_proto(write_z);
 920
 921 extern void write_user_defined (st_parameter_dt *, void *);
 922 internal_proto(write_user_defined);
 923
 924 extern void write_user_defined (st_parameter_dt *, void *);
 925 internal_proto(write_user_defined);
 926
 927 extern void list_formatted_write (st_parameter_dt *, bt, void *, int, size_t,
 928                                   size_t);
 929 internal_proto(list_formatted_write);
 930
 931 /* size_from_kind.c */
 932 extern size_t size_from_real_kind (int);
 933 internal_proto(size_from_real_kind);
 934
 935 extern size_t size_from_complex_kind (int);
 936 internal_proto(size_from_complex_kind);
 937
 938
 939 /* lock.c */
 940 extern void free_ionml (st_parameter_dt *);
 941 internal_proto(free_ionml);
 942
 943 static inline void
 944 inc_waiting_locked (gfc_unit *u)
 945 {
 946 #ifdef HAVE_SYNC_FETCH_AND_ADD
 947   (void) __sync_fetch_and_add (&u->waiting, 1);
 948 #else
 949   u->waiting++;
 950 #endif
 951 }
 952
 953 static inline int
 954 predec_waiting_locked (gfc_unit *u)
 955 {
 956 #ifdef HAVE_SYNC_FETCH_AND_ADD
 957   return __sync_add_and_fetch (&u->waiting, -1);
 958 #else
 959   return --u->waiting;
 960 #endif
 961 }
 962
 963 static inline void
 964 dec_waiting_unlocked (gfc_unit *u)
 965 {
 966 #ifdef HAVE_SYNC_FETCH_AND_ADD
 967   (void) __sync_fetch_and_add (&u->waiting, -1);
 968 #else
 969   __gthread_mutex_lock (&unit_lock);
 970   u->waiting--;
 971   __gthread_mutex_unlock (&unit_lock);
 972 #endif
 973 }
 974
 975
 976 static inline void
 977 memset4 (gfc_char4_t *p, gfc_char4_t c, int k)
 978 {
 979   int j;
 980   for (j = 0; j < k; j++)
 981     *p++ = c;
 982 }
 983
 984 #endif
 985