1 /* Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
2 Contributed by Andy Vaught
3 Namelist transfer functions contributed by Paul Thomas
5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
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 2, or (at your option)
12 In addition to the permissions in the GNU General Public License, the
13 Free Software Foundation gives you unlimited permission to link the
14 compiled version of this file into combinations with other programs,
15 and to distribute those combinations without any restriction coming
16 from the use of this file. (The General Public License restrictions
17 do apply in other respects; for example, they cover modification of
18 the file, and distribution when not linked into a combine
21 Libgfortran is distributed in the hope that it will be useful,
22 but WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 GNU General Public License for more details.
26 You should have received a copy of the GNU General Public License
27 along with Libgfortran; see the file COPYING. If not, write to
28 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
29 Boston, MA 02110-1301, USA. */
32 /* transfer.c -- Top level handling of data transfer statements. */
37 #include "libgfortran.h"
41 /* Calling conventions: Data transfer statements are unlike other
42 library calls in that they extend over several calls.
44 The first call is always a call to st_read() or st_write(). These
45 subroutines return no status unless a namelist read or write is
46 being done, in which case there is the usual status. No further
47 calls are necessary in this case.
49 For other sorts of data transfer, there are zero or more data
50 transfer statement that depend on the format of the data transfer
59 These subroutines do not return status.
61 The last call is a call to st_[read|write]_done(). While
62 something can easily go wrong with the initial st_read() or
63 st_write(), an error inhibits any data from actually being
66 extern void transfer_integer (st_parameter_dt *, void *, int);
67 export_proto(transfer_integer);
69 extern void transfer_real (st_parameter_dt *, void *, int);
70 export_proto(transfer_real);
72 extern void transfer_logical (st_parameter_dt *, void *, int);
73 export_proto(transfer_logical);
75 extern void transfer_character (st_parameter_dt *, void *, int);
76 export_proto(transfer_character);
78 extern void transfer_complex (st_parameter_dt *, void *, int);
79 export_proto(transfer_complex);
81 extern void transfer_array (st_parameter_dt *, gfc_array_char *, int,
83 export_proto(transfer_array);
85 static const st_option advance_opt[] = {
93 { FORMATTED_SEQUENTIAL, UNFORMATTED_SEQUENTIAL,
94 FORMATTED_DIRECT, UNFORMATTED_DIRECT
100 current_mode (st_parameter_dt *dtp)
104 if (dtp->u.p.current_unit->flags.access == ACCESS_DIRECT)
106 m = dtp->u.p.current_unit->flags.form == FORM_FORMATTED ?
107 FORMATTED_DIRECT : UNFORMATTED_DIRECT;
111 m = dtp->u.p.current_unit->flags.form == FORM_FORMATTED ?
112 FORMATTED_SEQUENTIAL : UNFORMATTED_SEQUENTIAL;
119 /* Mid level data transfer statements. These subroutines do reading
120 and writing in the style of salloc_r()/salloc_w() within the
123 /* When reading sequential formatted records we have a problem. We
124 don't know how long the line is until we read the trailing newline,
125 and we don't want to read too much. If we read too much, we might
126 have to do a physical seek backwards depending on how much data is
127 present, and devices like terminals aren't seekable and would cause
130 Given this, the solution is to read a byte at a time, stopping if
131 we hit the newline. For small locations, we use a static buffer.
132 For larger allocations, we are forced to allocate memory on the
133 heap. Hopefully this won't happen very often. */
136 read_sf (st_parameter_dt *dtp, int *length)
139 int n, readlen, crlf;
142 if (*length > SCRATCH_SIZE)
143 dtp->u.p.line_buffer = get_mem (*length);
144 p = base = dtp->u.p.line_buffer;
146 /* If we have seen an eor previously, return a length of 0. The
147 caller is responsible for correctly padding the input field. */
148 if (dtp->u.p.sf_seen_eor)
159 if (is_internal_unit (dtp))
161 /* readlen may be modified inside salloc_r if
162 is_internal_unit (dtp) is true. */
166 q = salloc_r (dtp->u.p.current_unit->s, &readlen);
170 /* If we have a line without a terminating \n, drop through to
172 if (readlen < 1 && n == 0)
174 generate_error (&dtp->common, ERROR_END, NULL);
178 if (readlen < 1 || *q == '\n' || *q == '\r')
180 /* Unexpected end of line. */
182 /* If we see an EOR during non-advancing I/O, we need to skip
183 the rest of the I/O statement. Set the corresponding flag. */
184 if (dtp->u.p.advance_status == ADVANCE_NO || dtp->u.p.seen_dollar)
185 dtp->u.p.eor_condition = 1;
188 /* If we encounter a CR, it might be a CRLF. */
189 if (*q == '\r') /* Probably a CRLF */
192 pos = stream_offset (dtp->u.p.current_unit->s);
193 q = salloc_r (dtp->u.p.current_unit->s, &readlen);
194 if (*q != '\n' && readlen == 1) /* Not a CRLF after all. */
195 sseek (dtp->u.p.current_unit->s, pos);
200 /* Without padding, terminate the I/O statement without assigning
201 the value. With padding, the value still needs to be assigned,
202 so we can just continue with a short read. */
203 if (dtp->u.p.current_unit->flags.pad == PAD_NO)
205 generate_error (&dtp->common, ERROR_EOR, NULL);
210 dtp->u.p.sf_seen_eor = (crlf ? 2 : 1);
213 /* Short circuit the read if a comma is found during numeric input.
214 The flag is set to zero during character reads so that commas in
215 strings are not ignored */
217 if (dtp->u.p.sf_read_comma == 1)
219 notify_std (GFC_STD_GNU, "Comma in formatted numeric read.");
226 dtp->u.p.sf_seen_eor = 0;
229 dtp->u.p.current_unit->bytes_left -= *length;
231 if ((dtp->common.flags & IOPARM_DT_HAS_SIZE) != 0)
232 *dtp->size += *length;
238 /* Function for reading the next couple of bytes from the current
239 file, advancing the current position. We return a pointer to a
240 buffer containing the bytes. We return NULL on end of record or
243 If the read is short, then it is because the current record does not
244 have enough data to satisfy the read request and the file was
245 opened with PAD=YES. The caller must assume tailing spaces for
249 read_block (st_parameter_dt *dtp, int *length)
254 if (dtp->u.p.current_unit->bytes_left < *length)
256 if (dtp->u.p.current_unit->flags.pad == PAD_NO)
258 generate_error (&dtp->common, ERROR_EOR, NULL);
259 /* Not enough data left. */
263 *length = dtp->u.p.current_unit->bytes_left;
266 if (dtp->u.p.current_unit->flags.form == FORM_FORMATTED &&
267 dtp->u.p.current_unit->flags.access == ACCESS_SEQUENTIAL)
268 return read_sf (dtp, length); /* Special case. */
270 dtp->u.p.current_unit->bytes_left -= *length;
273 source = salloc_r (dtp->u.p.current_unit->s, &nread);
275 if ((dtp->common.flags & IOPARM_DT_HAS_SIZE) != 0)
278 if (nread != *length)
279 { /* Short read, this shouldn't happen. */
280 if (dtp->u.p.current_unit->flags.pad == PAD_YES)
284 generate_error (&dtp->common, ERROR_EOR, NULL);
293 /* Reads a block directly into application data space. */
296 read_block_direct (st_parameter_dt *dtp, void *buf, size_t *nbytes)
302 if (dtp->u.p.current_unit->bytes_left < *nbytes)
304 if (dtp->u.p.current_unit->flags.pad == PAD_NO)
306 /* Not enough data left. */
307 generate_error (&dtp->common, ERROR_EOR, NULL);
311 *nbytes = dtp->u.p.current_unit->bytes_left;
314 if (dtp->u.p.current_unit->flags.form == FORM_FORMATTED &&
315 dtp->u.p.current_unit->flags.access == ACCESS_SEQUENTIAL)
317 length = (int *) nbytes;
318 data = read_sf (dtp, length); /* Special case. */
319 memcpy (buf, data, (size_t) *length);
323 dtp->u.p.current_unit->bytes_left -= *nbytes;
326 if (sread (dtp->u.p.current_unit->s, buf, &nread) != 0)
328 generate_error (&dtp->common, ERROR_OS, NULL);
332 if ((dtp->common.flags & IOPARM_DT_HAS_SIZE) != 0)
333 *dtp->size += (GFC_INTEGER_4) nread;
335 if (nread != *nbytes)
336 { /* Short read, e.g. if we hit EOF. */
337 if (dtp->u.p.current_unit->flags.pad == PAD_YES)
339 memset (((char *) buf) + nread, ' ', *nbytes - nread);
343 generate_error (&dtp->common, ERROR_EOR, NULL);
348 /* Function for writing a block of bytes to the current file at the
349 current position, advancing the file pointer. We are given a length
350 and return a pointer to a buffer that the caller must (completely)
351 fill in. Returns NULL on error. */
354 write_block (st_parameter_dt *dtp, int length)
358 if (dtp->u.p.current_unit->bytes_left < length)
360 generate_error (&dtp->common, ERROR_EOR, NULL);
364 dtp->u.p.current_unit->bytes_left -= (gfc_offset) length;
365 dest = salloc_w (dtp->u.p.current_unit->s, &length);
369 generate_error (&dtp->common, ERROR_END, NULL);
373 if ((dtp->common.flags & IOPARM_DT_HAS_SIZE) != 0)
374 *dtp->size += length;
380 /* Writes a block directly without necessarily allocating space in a
384 write_block_direct (st_parameter_dt *dtp, void *buf, size_t *nbytes)
386 if (dtp->u.p.current_unit->bytes_left < *nbytes)
387 generate_error (&dtp->common, ERROR_EOR, NULL);
389 dtp->u.p.current_unit->bytes_left -= (gfc_offset) *nbytes;
391 if (swrite (dtp->u.p.current_unit->s, buf, nbytes) != 0)
392 generate_error (&dtp->common, ERROR_OS, NULL);
394 if ((dtp->common.flags & IOPARM_DT_HAS_SIZE) != 0)
395 *dtp->size += (GFC_INTEGER_4) *nbytes;
399 /* Master function for unformatted reads. */
402 unformatted_read (st_parameter_dt *dtp, bt type,
403 void *dest, int kind,
404 size_t size, size_t nelems)
406 /* Currently, character implies size=1. */
407 if (dtp->u.p.current_unit->flags.convert == CONVERT_NATIVE
408 || size == 1 || type == BT_CHARACTER)
411 read_block_direct (dtp, dest, &size);
419 /* Break up complex into its constituent reals. */
420 if (type == BT_COMPLEX)
427 /* By now, all complex variables have been split into their
428 constituent reals. For types with padding, we only need to
429 read kind bytes. We don't care about the contents
433 for (i=0; i<nelems; i++)
435 read_block_direct (dtp, buffer, &sz);
436 reverse_memcpy (p, buffer, sz);
443 /* Master function for unformatted writes. */
446 unformatted_write (st_parameter_dt *dtp, bt type,
447 void *source, int kind,
448 size_t size, size_t nelems)
450 if (dtp->u.p.current_unit->flags.convert == CONVERT_NATIVE ||
451 size == 1 || type == BT_CHARACTER)
455 write_block_direct (dtp, source, &size);
463 /* Break up complex into its constituent reals. */
464 if (type == BT_COMPLEX)
472 /* By now, all complex variables have been split into their
473 constituent reals. For types with padding, we only need to
474 read kind bytes. We don't care about the contents
478 for (i=0; i<nelems; i++)
480 reverse_memcpy(buffer, p, size);
482 write_block_direct (dtp, buffer, &sz);
488 /* Return a pointer to the name of a type. */
513 internal_error (NULL, "type_name(): Bad type");
520 /* Write a constant string to the output.
521 This is complicated because the string can have doubled delimiters
522 in it. The length in the format node is the true length. */
525 write_constant_string (st_parameter_dt *dtp, const fnode *f)
527 char c, delimiter, *p, *q;
530 length = f->u.string.length;
534 p = write_block (dtp, length);
541 for (; length > 0; length--)
544 if (c == delimiter && c != 'H' && c != 'h')
545 q++; /* Skip the doubled delimiter. */
550 /* Given actual and expected types in a formatted data transfer, make
551 sure they agree. If not, an error message is generated. Returns
552 nonzero if something went wrong. */
555 require_type (st_parameter_dt *dtp, bt expected, bt actual, const fnode *f)
559 if (actual == expected)
562 st_sprintf (buffer, "Expected %s for item %d in formatted transfer, got %s",
563 type_name (expected), dtp->u.p.item_count, type_name (actual));
565 format_error (dtp, f, buffer);
570 /* This subroutine is the main loop for a formatted data transfer
571 statement. It would be natural to implement this as a coroutine
572 with the user program, but C makes that awkward. We loop,
573 processesing format elements. When we actually have to transfer
574 data instead of just setting flags, we return control to the user
575 program which calls a subroutine that supplies the address and type
576 of the next element, then comes back here to process it. */
579 formatted_transfer_scalar (st_parameter_dt *dtp, bt type, void *p, int len,
582 char scratch[SCRATCH_SIZE];
587 int consume_data_flag;
589 /* Change a complex data item into a pair of reals. */
591 n = (p == NULL) ? 0 : ((type != BT_COMPLEX) ? 1 : 2);
592 if (type == BT_COMPLEX)
598 /* If there's an EOR condition, we simulate finalizing the transfer
600 if (dtp->u.p.eor_condition)
603 /* Set this flag so that commas in reads cause the read to complete before
604 the entire field has been read. The next read field will start right after
605 the comma in the stream. (Set to 0 for character reads). */
606 dtp->u.p.sf_read_comma = 1;
608 dtp->u.p.line_buffer = scratch;
611 /* If reversion has occurred and there is another real data item,
612 then we have to move to the next record. */
613 if (dtp->u.p.reversion_flag && n > 0)
615 dtp->u.p.reversion_flag = 0;
616 next_record (dtp, 0);
619 consume_data_flag = 1 ;
620 if ((dtp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
623 f = next_format (dtp);
625 return; /* No data descriptors left (already raised). */
627 /* Now discharge T, TR and X movements to the right. This is delayed
628 until a data producing format to suppress trailing spaces. */
631 if (dtp->u.p.mode == WRITING && dtp->u.p.skips != 0
632 && ((n>0 && ( t == FMT_I || t == FMT_B || t == FMT_O
633 || t == FMT_Z || t == FMT_F || t == FMT_E
634 || t == FMT_EN || t == FMT_ES || t == FMT_G
635 || t == FMT_L || t == FMT_A || t == FMT_D))
638 if (dtp->u.p.skips > 0)
640 write_x (dtp, dtp->u.p.skips, dtp->u.p.pending_spaces);
641 dtp->u.p.max_pos = (int)(dtp->u.p.current_unit->recl
642 - dtp->u.p.current_unit->bytes_left);
644 if (dtp->u.p.skips < 0)
646 move_pos_offset (dtp->u.p.current_unit->s, dtp->u.p.skips);
647 dtp->u.p.current_unit->bytes_left -= (gfc_offset) dtp->u.p.skips;
649 dtp->u.p.skips = dtp->u.p.pending_spaces = 0;
652 bytes_used = (int)(dtp->u.p.current_unit->recl - dtp->u.p.current_unit->bytes_left);
659 if (require_type (dtp, BT_INTEGER, type, f))
662 if (dtp->u.p.mode == READING)
663 read_decimal (dtp, f, p, len);
665 write_i (dtp, f, p, len);
672 if (require_type (dtp, BT_INTEGER, type, f))
675 if (dtp->u.p.mode == READING)
676 read_radix (dtp, f, p, len, 2);
678 write_b (dtp, f, p, len);
686 if (dtp->u.p.mode == READING)
687 read_radix (dtp, f, p, len, 8);
689 write_o (dtp, f, p, len);
697 if (dtp->u.p.mode == READING)
698 read_radix (dtp, f, p, len, 16);
700 write_z (dtp, f, p, len);
708 if (dtp->u.p.mode == READING)
709 read_a (dtp, f, p, len);
711 write_a (dtp, f, p, len);
719 if (dtp->u.p.mode == READING)
720 read_l (dtp, f, p, len);
722 write_l (dtp, f, p, len);
729 if (require_type (dtp, BT_REAL, type, f))
732 if (dtp->u.p.mode == READING)
733 read_f (dtp, f, p, len);
735 write_d (dtp, f, p, len);
742 if (require_type (dtp, BT_REAL, type, f))
745 if (dtp->u.p.mode == READING)
746 read_f (dtp, f, p, len);
748 write_e (dtp, f, p, len);
754 if (require_type (dtp, BT_REAL, type, f))
757 if (dtp->u.p.mode == READING)
758 read_f (dtp, f, p, len);
760 write_en (dtp, f, p, len);
767 if (require_type (dtp, BT_REAL, type, f))
770 if (dtp->u.p.mode == READING)
771 read_f (dtp, f, p, len);
773 write_es (dtp, f, p, len);
780 if (require_type (dtp, BT_REAL, type, f))
783 if (dtp->u.p.mode == READING)
784 read_f (dtp, f, p, len);
786 write_f (dtp, f, p, len);
793 if (dtp->u.p.mode == READING)
797 read_decimal (dtp, f, p, len);
800 read_l (dtp, f, p, len);
803 read_a (dtp, f, p, len);
806 read_f (dtp, f, p, len);
815 write_i (dtp, f, p, len);
818 write_l (dtp, f, p, len);
821 write_a (dtp, f, p, len);
824 write_d (dtp, f, p, len);
828 internal_error (&dtp->common,
829 "formatted_transfer(): Bad type");
835 consume_data_flag = 0 ;
836 if (dtp->u.p.mode == READING)
838 format_error (dtp, f, "Constant string in input format");
841 write_constant_string (dtp, f);
844 /* Format codes that don't transfer data. */
847 consume_data_flag = 0 ;
849 pos = bytes_used + f->u.n + dtp->u.p.skips;
850 dtp->u.p.skips = f->u.n + dtp->u.p.skips;
851 dtp->u.p.pending_spaces = pos - dtp->u.p.max_pos;
853 /* Writes occur just before the switch on f->format, above, so
854 that trailing blanks are suppressed, unless we are doing a
855 non-advancing write in which case we want to output the blanks
857 if (dtp->u.p.mode == WRITING
858 && dtp->u.p.advance_status == ADVANCE_NO)
860 write_x (dtp, dtp->u.p.skips, dtp->u.p.pending_spaces);
861 dtp->u.p.skips = dtp->u.p.pending_spaces = 0;
863 if (dtp->u.p.mode == READING)
864 read_x (dtp, f->u.n);
870 if (f->format == FMT_TL)
873 /* Handle the special case when no bytes have been used yet.
874 Cannot go below zero. */
877 dtp->u.p.pending_spaces -= f->u.n;
878 dtp->u.p.pending_spaces = dtp->u.p.pending_spaces < 0 ? 0
879 : dtp->u.p.pending_spaces;
880 dtp->u.p.skips -= f->u.n;
881 dtp->u.p.skips = dtp->u.p.skips < 0 ? 0 : dtp->u.p.skips;
884 pos = bytes_used - f->u.n;
888 consume_data_flag = 0;
892 /* Standard 10.6.1.1: excessive left tabbing is reset to the
893 left tab limit. We do not check if the position has gone
894 beyond the end of record because a subsequent tab could
895 bring us back again. */
896 pos = pos < 0 ? 0 : pos;
898 dtp->u.p.skips = dtp->u.p.skips + pos - bytes_used;
899 dtp->u.p.pending_spaces = dtp->u.p.pending_spaces
900 + pos - dtp->u.p.max_pos;
902 if (dtp->u.p.skips == 0)
905 /* Writes occur just before the switch on f->format, above, so that
906 trailing blanks are suppressed. */
907 if (dtp->u.p.mode == READING)
909 /* Adjust everything for end-of-record condition */
910 if (dtp->u.p.sf_seen_eor && !is_internal_unit (dtp))
912 if (dtp->u.p.sf_seen_eor == 2)
914 /* The EOR was a CRLF (two bytes wide). */
915 dtp->u.p.current_unit->bytes_left -= 2;
920 /* The EOR marker was only one byte wide. */
921 dtp->u.p.current_unit->bytes_left--;
925 dtp->u.p.sf_seen_eor = 0;
927 if (dtp->u.p.skips < 0)
929 move_pos_offset (dtp->u.p.current_unit->s, dtp->u.p.skips);
930 dtp->u.p.current_unit->bytes_left
931 -= (gfc_offset) dtp->u.p.skips;
932 dtp->u.p.skips = dtp->u.p.pending_spaces = 0;
935 read_x (dtp, dtp->u.p.skips);
941 consume_data_flag = 0 ;
942 dtp->u.p.sign_status = SIGN_S;
946 consume_data_flag = 0 ;
947 dtp->u.p.sign_status = SIGN_SS;
951 consume_data_flag = 0 ;
952 dtp->u.p.sign_status = SIGN_SP;
956 consume_data_flag = 0 ;
957 dtp->u.p.blank_status = BLANK_NULL;
961 consume_data_flag = 0 ;
962 dtp->u.p.blank_status = BLANK_ZERO;
966 consume_data_flag = 0 ;
967 dtp->u.p.scale_factor = f->u.k;
971 consume_data_flag = 0 ;
972 dtp->u.p.seen_dollar = 1;
976 consume_data_flag = 0 ;
977 dtp->u.p.skips = dtp->u.p.pending_spaces = 0;
978 next_record (dtp, 0);
982 /* A colon descriptor causes us to exit this loop (in
983 particular preventing another / descriptor from being
984 processed) unless there is another data item to be
986 consume_data_flag = 0 ;
992 internal_error (&dtp->common, "Bad format node");
995 /* Free a buffer that we had to allocate during a sequential
996 formatted read of a block that was larger than the static
999 if (dtp->u.p.line_buffer != scratch)
1001 free_mem (dtp->u.p.line_buffer);
1002 dtp->u.p.line_buffer = scratch;
1005 /* Adjust the item count and data pointer. */
1007 if ((consume_data_flag > 0) && (n > 0))
1010 p = ((char *) p) + size;
1013 if (dtp->u.p.mode == READING)
1016 pos = (int)(dtp->u.p.current_unit->recl - dtp->u.p.current_unit->bytes_left);
1017 dtp->u.p.max_pos = (dtp->u.p.max_pos > pos) ? dtp->u.p.max_pos : pos;
1023 /* Come here when we need a data descriptor but don't have one. We
1024 push the current format node back onto the input, then return and
1025 let the user program call us back with the data. */
1027 unget_format (dtp, f);
1031 formatted_transfer (st_parameter_dt *dtp, bt type, void *p, int kind,
1032 size_t size, size_t nelems)
1039 /* Big loop over all the elements. */
1040 for (elem = 0; elem < nelems; elem++)
1042 dtp->u.p.item_count++;
1043 formatted_transfer_scalar (dtp, type, tmp + size*elem, kind, size);
1049 /* Data transfer entry points. The type of the data entity is
1050 implicit in the subroutine call. This prevents us from having to
1051 share a common enum with the compiler. */
1054 transfer_integer (st_parameter_dt *dtp, void *p, int kind)
1056 if ((dtp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
1058 dtp->u.p.transfer (dtp, BT_INTEGER, p, kind, kind, 1);
1063 transfer_real (st_parameter_dt *dtp, void *p, int kind)
1066 if ((dtp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
1068 size = size_from_real_kind (kind);
1069 dtp->u.p.transfer (dtp, BT_REAL, p, kind, size, 1);
1074 transfer_logical (st_parameter_dt *dtp, void *p, int kind)
1076 if ((dtp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
1078 dtp->u.p.transfer (dtp, BT_LOGICAL, p, kind, kind, 1);
1083 transfer_character (st_parameter_dt *dtp, void *p, int len)
1085 if ((dtp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
1087 /* Currently we support only 1 byte chars, and the library is a bit
1088 confused of character kind vs. length, so we kludge it by setting
1090 dtp->u.p.transfer (dtp, BT_CHARACTER, p, len, len, 1);
1095 transfer_complex (st_parameter_dt *dtp, void *p, int kind)
1098 if ((dtp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
1100 size = size_from_complex_kind (kind);
1101 dtp->u.p.transfer (dtp, BT_COMPLEX, p, kind, size, 1);
1106 transfer_array (st_parameter_dt *dtp, gfc_array_char *desc, int kind,
1107 gfc_charlen_type charlen)
1109 index_type count[GFC_MAX_DIMENSIONS];
1110 index_type extent[GFC_MAX_DIMENSIONS];
1111 index_type stride[GFC_MAX_DIMENSIONS];
1112 index_type stride0, rank, size, type, n;
1117 if ((dtp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
1120 type = GFC_DESCRIPTOR_TYPE (desc);
1121 size = GFC_DESCRIPTOR_SIZE (desc);
1123 /* FIXME: What a kludge: Array descriptors and the IO library use
1124 different enums for types. */
1127 case GFC_DTYPE_UNKNOWN:
1128 iotype = BT_NULL; /* Is this correct? */
1130 case GFC_DTYPE_INTEGER:
1131 iotype = BT_INTEGER;
1133 case GFC_DTYPE_LOGICAL:
1134 iotype = BT_LOGICAL;
1136 case GFC_DTYPE_REAL:
1139 case GFC_DTYPE_COMPLEX:
1140 iotype = BT_COMPLEX;
1142 case GFC_DTYPE_CHARACTER:
1143 iotype = BT_CHARACTER;
1144 /* FIXME: Currently dtype contains the charlen, which is
1145 clobbered if charlen > 2**24. That's why we use a separate
1146 argument for the charlen. However, if we want to support
1147 non-8-bit charsets we need to fix dtype to contain
1148 sizeof(chartype) and fix the code below. */
1152 case GFC_DTYPE_DERIVED:
1153 internal_error (&dtp->common,
1154 "Derived type I/O should have been handled via the frontend.");
1157 internal_error (&dtp->common, "transfer_array(): Bad type");
1160 if (desc->dim[0].stride == 0)
1161 desc->dim[0].stride = 1;
1163 rank = GFC_DESCRIPTOR_RANK (desc);
1164 for (n = 0; n < rank; n++)
1167 stride[n] = desc->dim[n].stride;
1168 extent[n] = desc->dim[n].ubound + 1 - desc->dim[n].lbound;
1170 /* If the extent of even one dimension is zero, then the entire
1171 array section contains zero elements, so we return. */
1176 stride0 = stride[0];
1178 /* If the innermost dimension has stride 1, we can do the transfer
1179 in contiguous chunks. */
1185 data = GFC_DESCRIPTOR_DATA (desc);
1189 dtp->u.p.transfer (dtp, iotype, data, kind, size, tsize);
1190 data += stride0 * size * tsize;
1193 while (count[n] == extent[n])
1196 data -= stride[n] * extent[n] * size;
1206 data += stride[n] * size;
1213 /* Preposition a sequential unformatted file while reading. */
1216 us_read (st_parameter_dt *dtp)
1222 n = sizeof (gfc_offset);
1223 p = salloc_r (dtp->u.p.current_unit->s, &n);
1226 return; /* end of file */
1228 if (p == NULL || n != sizeof (gfc_offset))
1230 generate_error (&dtp->common, ERROR_BAD_US, NULL);
1234 /* Only CONVERT_NATIVE and CONVERT_SWAP are valid here. */
1235 if (dtp->u.p.current_unit->flags.convert == CONVERT_NATIVE)
1236 memcpy (&i, p, sizeof (gfc_offset));
1238 reverse_memcpy (&i, p, sizeof (gfc_offset));
1240 dtp->u.p.current_unit->bytes_left = i;
1244 /* Preposition a sequential unformatted file while writing. This
1245 amount to writing a bogus length that will be filled in later. */
1248 us_write (st_parameter_dt *dtp)
1253 length = sizeof (gfc_offset);
1254 p = salloc_w (dtp->u.p.current_unit->s, &length);
1258 generate_error (&dtp->common, ERROR_OS, NULL);
1262 memset (p, '\0', sizeof (gfc_offset)); /* Bogus value for now. */
1263 if (sfree (dtp->u.p.current_unit->s) == FAILURE)
1264 generate_error (&dtp->common, ERROR_OS, NULL);
1266 /* For sequential unformatted, we write until we have more bytes than
1267 can fit in the record markers. If disk space runs out first, it will
1268 error on the write. */
1269 dtp->u.p.current_unit->recl = max_offset;
1271 dtp->u.p.current_unit->bytes_left = dtp->u.p.current_unit->recl;
1275 /* Position to the next record prior to transfer. We are assumed to
1276 be before the next record. We also calculate the bytes in the next
1280 pre_position (st_parameter_dt *dtp)
1282 if (dtp->u.p.current_unit->current_record)
1283 return; /* Already positioned. */
1285 switch (current_mode (dtp))
1287 case UNFORMATTED_SEQUENTIAL:
1288 if (dtp->u.p.mode == READING)
1295 case FORMATTED_SEQUENTIAL:
1296 case FORMATTED_DIRECT:
1297 case UNFORMATTED_DIRECT:
1298 dtp->u.p.current_unit->bytes_left = dtp->u.p.current_unit->recl;
1302 dtp->u.p.current_unit->current_record = 1;
1306 /* Initialize things for a data transfer. This code is common for
1307 both reading and writing. */
1310 data_transfer_init (st_parameter_dt *dtp, int read_flag)
1312 unit_flags u_flags; /* Used for creating a unit if needed. */
1313 GFC_INTEGER_4 cf = dtp->common.flags;
1314 namelist_info *ionml;
1316 ionml = ((cf & IOPARM_DT_IONML_SET) != 0) ? dtp->u.p.ionml : NULL;
1317 memset (&dtp->u.p, 0, sizeof (dtp->u.p));
1318 dtp->u.p.ionml = ionml;
1319 dtp->u.p.mode = read_flag ? READING : WRITING;
1321 if ((cf & IOPARM_DT_HAS_SIZE) != 0)
1322 *dtp->size = 0; /* Initialize the count. */
1324 dtp->u.p.current_unit = get_unit (dtp, 1);
1325 if (dtp->u.p.current_unit->s == NULL)
1326 { /* Open the unit with some default flags. */
1327 st_parameter_open opp;
1328 if (dtp->common.unit < 0)
1330 close_unit (dtp->u.p.current_unit);
1331 dtp->u.p.current_unit = NULL;
1332 generate_error (&dtp->common, ERROR_BAD_OPTION,
1333 "Bad unit number in OPEN statement");
1336 memset (&u_flags, '\0', sizeof (u_flags));
1337 u_flags.access = ACCESS_SEQUENTIAL;
1338 u_flags.action = ACTION_READWRITE;
1340 /* Is it unformatted? */
1341 if (!(cf & (IOPARM_DT_HAS_FORMAT | IOPARM_DT_LIST_FORMAT
1342 | IOPARM_DT_IONML_SET)))
1343 u_flags.form = FORM_UNFORMATTED;
1345 u_flags.form = FORM_UNSPECIFIED;
1347 u_flags.delim = DELIM_UNSPECIFIED;
1348 u_flags.blank = BLANK_UNSPECIFIED;
1349 u_flags.pad = PAD_UNSPECIFIED;
1350 u_flags.status = STATUS_UNKNOWN;
1351 opp.common = dtp->common;
1352 opp.common.flags &= IOPARM_COMMON_MASK;
1353 dtp->u.p.current_unit = new_unit (&opp, dtp->u.p.current_unit, &u_flags);
1354 dtp->common.flags &= ~IOPARM_COMMON_MASK;
1355 dtp->common.flags |= (opp.common.flags & IOPARM_COMMON_MASK);
1356 if (dtp->u.p.current_unit == NULL)
1360 /* Check the action. */
1362 if (read_flag && dtp->u.p.current_unit->flags.action == ACTION_WRITE)
1363 generate_error (&dtp->common, ERROR_BAD_ACTION,
1364 "Cannot read from file opened for WRITE");
1366 if (!read_flag && dtp->u.p.current_unit->flags.action == ACTION_READ)
1367 generate_error (&dtp->common, ERROR_BAD_ACTION,
1368 "Cannot write to file opened for READ");
1370 if ((dtp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
1373 dtp->u.p.first_item = 1;
1375 /* Check the format. */
1377 if ((cf & IOPARM_DT_HAS_FORMAT) != 0)
1380 if ((dtp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
1383 if (dtp->u.p.current_unit->flags.form == FORM_UNFORMATTED
1384 && (cf & (IOPARM_DT_HAS_FORMAT | IOPARM_DT_LIST_FORMAT))
1386 generate_error (&dtp->common, ERROR_OPTION_CONFLICT,
1387 "Format present for UNFORMATTED data transfer");
1389 if ((cf & IOPARM_DT_HAS_NAMELIST_NAME) != 0 && dtp->u.p.ionml != NULL)
1391 if ((cf & IOPARM_DT_HAS_FORMAT) != 0)
1392 generate_error (&dtp->common, ERROR_OPTION_CONFLICT,
1393 "A format cannot be specified with a namelist");
1395 else if (dtp->u.p.current_unit->flags.form == FORM_FORMATTED &&
1396 !(cf & (IOPARM_DT_HAS_FORMAT | IOPARM_DT_LIST_FORMAT)))
1397 generate_error (&dtp->common, ERROR_OPTION_CONFLICT,
1398 "Missing format for FORMATTED data transfer");
1401 if (is_internal_unit (dtp)
1402 && dtp->u.p.current_unit->flags.form == FORM_UNFORMATTED)
1403 generate_error (&dtp->common, ERROR_OPTION_CONFLICT,
1404 "Internal file cannot be accessed by UNFORMATTED data transfer");
1406 /* Check the record number. */
1408 if (dtp->u.p.current_unit->flags.access == ACCESS_DIRECT
1409 && (cf & IOPARM_DT_HAS_REC) == 0)
1411 generate_error (&dtp->common, ERROR_MISSING_OPTION,
1412 "Direct access data transfer requires record number");
1416 if (dtp->u.p.current_unit->flags.access == ACCESS_SEQUENTIAL
1417 && (cf & IOPARM_DT_HAS_REC) != 0)
1419 generate_error (&dtp->common, ERROR_OPTION_CONFLICT,
1420 "Record number not allowed for sequential access data transfer");
1424 /* Process the ADVANCE option. */
1426 dtp->u.p.advance_status
1427 = !(cf & IOPARM_DT_HAS_ADVANCE) ? ADVANCE_UNSPECIFIED :
1428 find_option (&dtp->common, dtp->advance, dtp->advance_len, advance_opt,
1429 "Bad ADVANCE parameter in data transfer statement");
1431 if (dtp->u.p.advance_status != ADVANCE_UNSPECIFIED)
1433 if (dtp->u.p.current_unit->flags.access == ACCESS_DIRECT)
1434 generate_error (&dtp->common, ERROR_OPTION_CONFLICT,
1435 "ADVANCE specification conflicts with sequential access");
1437 if (is_internal_unit (dtp))
1438 generate_error (&dtp->common, ERROR_OPTION_CONFLICT,
1439 "ADVANCE specification conflicts with internal file");
1441 if ((cf & (IOPARM_DT_HAS_FORMAT | IOPARM_DT_LIST_FORMAT))
1442 != IOPARM_DT_HAS_FORMAT)
1443 generate_error (&dtp->common, ERROR_OPTION_CONFLICT,
1444 "ADVANCE specification requires an explicit format");
1449 if ((cf & IOPARM_EOR) != 0 && dtp->u.p.advance_status != ADVANCE_NO)
1450 generate_error (&dtp->common, ERROR_MISSING_OPTION,
1451 "EOR specification requires an ADVANCE specification of NO");
1453 if ((cf & IOPARM_DT_HAS_SIZE) != 0 && dtp->u.p.advance_status != ADVANCE_NO)
1454 generate_error (&dtp->common, ERROR_MISSING_OPTION,
1455 "SIZE specification requires an ADVANCE specification of NO");
1459 { /* Write constraints. */
1460 if ((cf & IOPARM_END) != 0)
1461 generate_error (&dtp->common, ERROR_OPTION_CONFLICT,
1462 "END specification cannot appear in a write statement");
1464 if ((cf & IOPARM_EOR) != 0)
1465 generate_error (&dtp->common, ERROR_OPTION_CONFLICT,
1466 "EOR specification cannot appear in a write statement");
1468 if ((cf & IOPARM_DT_HAS_SIZE) != 0)
1469 generate_error (&dtp->common, ERROR_OPTION_CONFLICT,
1470 "SIZE specification cannot appear in a write statement");
1473 if (dtp->u.p.advance_status == ADVANCE_UNSPECIFIED)
1474 dtp->u.p.advance_status = ADVANCE_YES;
1475 if ((dtp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
1478 /* Sanity checks on the record number. */
1480 if ((cf & IOPARM_DT_HAS_REC) != 0)
1484 generate_error (&dtp->common, ERROR_BAD_OPTION,
1485 "Record number must be positive");
1489 if (dtp->rec >= dtp->u.p.current_unit->maxrec)
1491 generate_error (&dtp->common, ERROR_BAD_OPTION,
1492 "Record number too large");
1496 /* Check to see if we might be reading what we wrote before */
1498 if (dtp->u.p.mode == READING && dtp->u.p.current_unit->mode == WRITING)
1499 flush(dtp->u.p.current_unit->s);
1501 /* Check whether the record exists to be read. Only
1502 a partial record needs to exist. */
1504 if (dtp->u.p.mode == READING && (dtp->rec -1)
1505 * dtp->u.p.current_unit->recl >= file_length (dtp->u.p.current_unit->s))
1507 generate_error (&dtp->common, ERROR_BAD_OPTION,
1508 "Non-existing record number");
1512 /* Position the file. */
1513 if (sseek (dtp->u.p.current_unit->s,
1514 (dtp->rec - 1) * dtp->u.p.current_unit->recl) == FAILURE)
1516 generate_error (&dtp->common, ERROR_OS, NULL);
1521 /* Overwriting an existing sequential file ?
1522 it is always safe to truncate the file on the first write */
1523 if (dtp->u.p.mode == WRITING
1524 && dtp->u.p.current_unit->flags.access == ACCESS_SEQUENTIAL
1525 && dtp->u.p.current_unit->last_record == 0 && !is_preconnected(dtp->u.p.current_unit->s))
1526 struncate(dtp->u.p.current_unit->s);
1528 /* Bugware for badly written mixed C-Fortran I/O. */
1529 flush_if_preconnected(dtp->u.p.current_unit->s);
1531 dtp->u.p.current_unit->mode = dtp->u.p.mode;
1533 /* Set the initial value of flags. */
1535 dtp->u.p.blank_status = dtp->u.p.current_unit->flags.blank;
1536 dtp->u.p.sign_status = SIGN_S;
1540 /* Set up the subroutine that will handle the transfers. */
1544 if (dtp->u.p.current_unit->flags.form == FORM_UNFORMATTED)
1545 dtp->u.p.transfer = unformatted_read;
1548 if ((cf & IOPARM_DT_LIST_FORMAT) != 0)
1549 dtp->u.p.transfer = list_formatted_read;
1551 dtp->u.p.transfer = formatted_transfer;
1556 if (dtp->u.p.current_unit->flags.form == FORM_UNFORMATTED)
1557 dtp->u.p.transfer = unformatted_write;
1560 if ((cf & IOPARM_DT_LIST_FORMAT) != 0)
1561 dtp->u.p.transfer = list_formatted_write;
1563 dtp->u.p.transfer = formatted_transfer;
1567 /* Make sure that we don't do a read after a nonadvancing write. */
1571 if (dtp->u.p.current_unit->read_bad)
1573 generate_error (&dtp->common, ERROR_BAD_OPTION,
1574 "Cannot READ after a nonadvancing WRITE");
1580 if (dtp->u.p.advance_status == ADVANCE_YES && !dtp->u.p.seen_dollar)
1581 dtp->u.p.current_unit->read_bad = 1;
1584 /* Start the data transfer if we are doing a formatted transfer. */
1585 if (dtp->u.p.current_unit->flags.form == FORM_FORMATTED
1586 && ((cf & (IOPARM_DT_LIST_FORMAT | IOPARM_DT_HAS_NAMELIST_NAME)) == 0)
1587 && dtp->u.p.ionml == NULL)
1588 formatted_transfer (dtp, 0, NULL, 0, 0, 1);
1591 /* Initialize an array_loop_spec given the array descriptor. The function
1592 returns the index of the last element of the array. */
1595 init_loop_spec (gfc_array_char *desc, array_loop_spec *ls)
1597 int rank = GFC_DESCRIPTOR_RANK(desc);
1602 for (i=0; i<rank; i++)
1605 ls[i].start = desc->dim[i].lbound;
1606 ls[i].end = desc->dim[i].ubound;
1607 ls[i].step = desc->dim[i].stride;
1609 index += (desc->dim[i].ubound - desc->dim[i].lbound)
1610 * desc->dim[i].stride;
1615 /* Determine the index to the next record in an internal unit array by
1616 by incrementing through the array_loop_spec. TODO: Implement handling
1617 negative strides. */
1620 next_array_record (st_parameter_dt *dtp, array_loop_spec *ls)
1628 for (i = 0; i < dtp->u.p.current_unit->rank; i++)
1633 if (ls[i].idx > ls[i].end)
1635 ls[i].idx = ls[i].start;
1641 index = index + (ls[i].idx - 1) * ls[i].step;
1646 /* Space to the next record for read mode. If the file is not
1647 seekable, we read MAX_READ chunks until we get to the right
1650 #define MAX_READ 4096
1653 next_record_r (st_parameter_dt *dtp)
1655 gfc_offset new, record;
1656 int bytes_left, rlength, length;
1659 switch (current_mode (dtp))
1661 case UNFORMATTED_SEQUENTIAL:
1663 /* Skip over tail */
1664 dtp->u.p.current_unit->bytes_left += sizeof (gfc_offset);
1666 /* Fall through... */
1668 case FORMATTED_DIRECT:
1669 case UNFORMATTED_DIRECT:
1670 if (dtp->u.p.current_unit->bytes_left == 0)
1673 if (is_seekable (dtp->u.p.current_unit->s))
1675 new = file_position (dtp->u.p.current_unit->s)
1676 + dtp->u.p.current_unit->bytes_left;
1678 /* Direct access files do not generate END conditions,
1680 if (sseek (dtp->u.p.current_unit->s, new) == FAILURE)
1681 generate_error (&dtp->common, ERROR_OS, NULL);
1685 { /* Seek by reading data. */
1686 while (dtp->u.p.current_unit->bytes_left > 0)
1688 rlength = length = (MAX_READ > dtp->u.p.current_unit->bytes_left) ?
1689 MAX_READ : dtp->u.p.current_unit->bytes_left;
1691 p = salloc_r (dtp->u.p.current_unit->s, &rlength);
1694 generate_error (&dtp->common, ERROR_OS, NULL);
1698 dtp->u.p.current_unit->bytes_left -= length;
1703 case FORMATTED_SEQUENTIAL:
1705 /* sf_read has already terminated input because of an '\n' */
1706 if (dtp->u.p.sf_seen_eor)
1708 dtp->u.p.sf_seen_eor = 0;
1712 if (is_internal_unit (dtp))
1714 if (is_array_io (dtp))
1716 record = next_array_record (dtp, dtp->u.p.current_unit->ls);
1718 /* Now seek to this record. */
1719 record = record * dtp->u.p.current_unit->recl;
1720 if (sseek (dtp->u.p.current_unit->s, record) == FAILURE)
1722 generate_error (&dtp->common, ERROR_INTERNAL_UNIT, NULL);
1725 dtp->u.p.current_unit->bytes_left = dtp->u.p.current_unit->recl;
1729 bytes_left = (int) dtp->u.p.current_unit->bytes_left;
1730 p = salloc_r (dtp->u.p.current_unit->s, &bytes_left);
1732 dtp->u.p.current_unit->bytes_left
1733 = dtp->u.p.current_unit->recl;
1739 p = salloc_r (dtp->u.p.current_unit->s, &length);
1743 generate_error (&dtp->common, ERROR_OS, NULL);
1749 dtp->u.p.current_unit->endfile = AT_ENDFILE;
1758 if (dtp->u.p.current_unit->flags.access == ACCESS_SEQUENTIAL)
1759 test_endfile (dtp->u.p.current_unit);
1763 /* Position to the next record in write mode. */
1766 next_record_w (st_parameter_dt *dtp, int done)
1768 gfc_offset c, m, record, max_pos;
1772 /* Zero counters for X- and T-editing. */
1773 max_pos = dtp->u.p.max_pos;
1774 dtp->u.p.max_pos = dtp->u.p.skips = dtp->u.p.pending_spaces = 0;
1776 switch (current_mode (dtp))
1778 case FORMATTED_DIRECT:
1779 if (dtp->u.p.current_unit->bytes_left == 0)
1782 length = dtp->u.p.current_unit->bytes_left;
1783 p = salloc_w (dtp->u.p.current_unit->s, &length);
1788 memset (p, ' ', dtp->u.p.current_unit->bytes_left);
1789 if (sfree (dtp->u.p.current_unit->s) == FAILURE)
1793 case UNFORMATTED_DIRECT:
1794 if (sfree (dtp->u.p.current_unit->s) == FAILURE)
1798 case UNFORMATTED_SEQUENTIAL:
1799 /* Bytes written. */
1800 m = dtp->u.p.current_unit->recl - dtp->u.p.current_unit->bytes_left;
1801 c = file_position (dtp->u.p.current_unit->s);
1803 length = sizeof (gfc_offset);
1805 /* Write the length tail. */
1807 p = salloc_w (dtp->u.p.current_unit->s, &length);
1811 /* Only CONVERT_NATIVE and CONVERT_SWAP are valid here. */
1812 if (dtp->u.p.current_unit->flags.convert == CONVERT_NATIVE)
1813 memcpy (p, &m, sizeof (gfc_offset));
1815 reverse_memcpy (p, &m, sizeof (gfc_offset));
1817 if (sfree (dtp->u.p.current_unit->s) == FAILURE)
1820 /* Seek to the head and overwrite the bogus length with the real
1823 p = salloc_w_at (dtp->u.p.current_unit->s, &length, c - m - length);
1825 generate_error (&dtp->common, ERROR_OS, NULL);
1827 /* Only CONVERT_NATIVE and CONVERT_SWAP are valid here. */
1828 if (dtp->u.p.current_unit->flags.convert == CONVERT_NATIVE)
1829 memcpy (p, &m, sizeof (gfc_offset));
1831 reverse_memcpy (p, &m, sizeof (gfc_offset));
1833 if (sfree (dtp->u.p.current_unit->s) == FAILURE)
1836 /* Seek past the end of the current record. */
1838 if (sseek (dtp->u.p.current_unit->s, c + sizeof (gfc_offset)) == FAILURE)
1843 case FORMATTED_SEQUENTIAL:
1845 if (dtp->u.p.current_unit->bytes_left == 0)
1848 if (is_internal_unit (dtp))
1850 if (is_array_io (dtp))
1852 length = (int) dtp->u.p.current_unit->bytes_left;
1854 /* If the farthest position reached is greater than current
1855 position, adjust the position and set length to pad out
1856 whats left. Otherwise just pad whats left.
1857 (for character array unit) */
1858 m = dtp->u.p.current_unit->recl
1859 - dtp->u.p.current_unit->bytes_left;
1862 length = (int) (max_pos - m);
1863 p = salloc_w (dtp->u.p.current_unit->s, &length);
1864 length = (int) (dtp->u.p.current_unit->recl - max_pos);
1867 p = salloc_w (dtp->u.p.current_unit->s, &length);
1870 generate_error (&dtp->common, ERROR_END, NULL);
1873 memset(p, ' ', length);
1875 /* Now that the current record has been padded out,
1876 determine where the next record in the array is. */
1877 record = next_array_record (dtp, dtp->u.p.current_unit->ls);
1879 /* Now seek to this record */
1880 record = record * dtp->u.p.current_unit->recl;
1882 if (sseek (dtp->u.p.current_unit->s, record) == FAILURE)
1884 generate_error (&dtp->common, ERROR_INTERNAL_UNIT, NULL);
1888 dtp->u.p.current_unit->bytes_left = dtp->u.p.current_unit->recl;
1894 /* If this is the last call to next_record move to the farthest
1895 position reached and set length to pad out the remainder
1896 of the record. (for character scaler unit) */
1899 m = dtp->u.p.current_unit->recl
1900 - dtp->u.p.current_unit->bytes_left;
1903 length = (int) (max_pos - m);
1904 p = salloc_w (dtp->u.p.current_unit->s, &length);
1905 length = (int) (dtp->u.p.current_unit->recl - max_pos);
1908 length = (int) dtp->u.p.current_unit->bytes_left;
1910 p = salloc_w (dtp->u.p.current_unit->s, &length);
1913 generate_error (&dtp->common, ERROR_END, NULL);
1916 memset (p, ' ', length);
1921 /* If this is the last call to next_record move to the farthest
1922 position reached in preparation for completing the record.
1926 m = dtp->u.p.current_unit->recl -
1927 dtp->u.p.current_unit->bytes_left;
1930 length = (int) (max_pos - m);
1931 p = salloc_w (dtp->u.p.current_unit->s, &length);
1939 p = salloc_w (dtp->u.p.current_unit->s, &length);
1941 { /* No new line for internal writes. */
1956 generate_error (&dtp->common, ERROR_OS, NULL);
1961 /* Position to the next record, which means moving to the end of the
1962 current record. This can happen under several different
1963 conditions. If the done flag is not set, we get ready to process
1967 next_record (st_parameter_dt *dtp, int done)
1969 gfc_offset fp; /* File position. */
1971 dtp->u.p.current_unit->read_bad = 0;
1973 if (dtp->u.p.mode == READING)
1974 next_record_r (dtp);
1976 next_record_w (dtp, done);
1978 /* keep position up to date for INQUIRE */
1979 dtp->u.p.current_unit->flags.position = POSITION_ASIS;
1981 dtp->u.p.current_unit->current_record = 0;
1982 if (dtp->u.p.current_unit->flags.access == ACCESS_DIRECT)
1984 fp = file_position (dtp->u.p.current_unit->s);
1985 /* Calculate next record, rounding up partial records. */
1986 dtp->u.p.current_unit->last_record = (fp + dtp->u.p.current_unit->recl - 1)
1987 / dtp->u.p.current_unit->recl;
1990 dtp->u.p.current_unit->last_record++;
1997 /* Finalize the current data transfer. For a nonadvancing transfer,
1998 this means advancing to the next record. For internal units close the
1999 stream associated with the unit. */
2002 finalize_transfer (st_parameter_dt *dtp)
2005 GFC_INTEGER_4 cf = dtp->common.flags;
2007 if (dtp->u.p.eor_condition)
2009 generate_error (&dtp->common, ERROR_EOR, NULL);
2013 if ((dtp->common.flags & IOPARM_LIBRETURN_MASK) != IOPARM_LIBRETURN_OK)
2016 if ((dtp->u.p.ionml != NULL)
2017 && (cf & IOPARM_DT_HAS_NAMELIST_NAME) != 0)
2019 if ((cf & IOPARM_DT_NAMELIST_READ_MODE) != 0)
2020 namelist_read (dtp);
2022 namelist_write (dtp);
2025 dtp->u.p.transfer = NULL;
2026 if (dtp->u.p.current_unit == NULL)
2029 dtp->u.p.eof_jump = &eof_jump;
2030 if (setjmp (eof_jump))
2032 generate_error (&dtp->common, ERROR_END, NULL);
2036 if ((cf & IOPARM_DT_LIST_FORMAT) != 0 && dtp->u.p.mode == READING)
2037 finish_list_read (dtp);
2040 dtp->u.p.current_unit->current_record = 0;
2041 if (dtp->u.p.advance_status == ADVANCE_NO || dtp->u.p.seen_dollar)
2043 /* Most systems buffer lines, so force the partial record
2044 to be written out. */
2045 flush (dtp->u.p.current_unit->s);
2046 dtp->u.p.seen_dollar = 0;
2050 next_record (dtp, 1);
2053 sfree (dtp->u.p.current_unit->s);
2055 if (is_internal_unit (dtp))
2057 if (is_array_io (dtp) && dtp->u.p.current_unit->ls != NULL)
2058 free_mem (dtp->u.p.current_unit->ls);
2059 sclose (dtp->u.p.current_unit->s);
2064 /* Transfer function for IOLENGTH. It doesn't actually do any
2065 data transfer, it just updates the length counter. */
2068 iolength_transfer (st_parameter_dt *dtp, bt type __attribute__((unused)),
2069 void *dest __attribute__ ((unused)),
2070 int kind __attribute__((unused)),
2071 size_t size, size_t nelems)
2073 if ((dtp->common.flags & IOPARM_DT_HAS_IOLENGTH) != 0)
2074 *dtp->iolength += (GFC_INTEGER_4) size * nelems;
2078 /* Initialize the IOLENGTH data transfer. This function is in essence
2079 a very much simplified version of data_transfer_init(), because it
2080 doesn't have to deal with units at all. */
2083 iolength_transfer_init (st_parameter_dt *dtp)
2085 if ((dtp->common.flags & IOPARM_DT_HAS_IOLENGTH) != 0)
2088 memset (&dtp->u.p, 0, sizeof (dtp->u.p));
2090 /* Set up the subroutine that will handle the transfers. */
2092 dtp->u.p.transfer = iolength_transfer;
2096 /* Library entry point for the IOLENGTH form of the INQUIRE
2097 statement. The IOLENGTH form requires no I/O to be performed, but
2098 it must still be a runtime library call so that we can determine
2099 the iolength for dynamic arrays and such. */
2101 extern void st_iolength (st_parameter_dt *);
2102 export_proto(st_iolength);
2105 st_iolength (st_parameter_dt *dtp)
2107 library_start (&dtp->common);
2108 iolength_transfer_init (dtp);
2111 extern void st_iolength_done (st_parameter_dt *);
2112 export_proto(st_iolength_done);
2115 st_iolength_done (st_parameter_dt *dtp __attribute__((unused)))
2118 if (dtp->u.p.scratch != NULL)
2119 free_mem (dtp->u.p.scratch);
2124 /* The READ statement. */
2126 extern void st_read (st_parameter_dt *);
2127 export_proto(st_read);
2130 st_read (st_parameter_dt *dtp)
2133 library_start (&dtp->common);
2135 data_transfer_init (dtp, 1);
2137 /* Handle complications dealing with the endfile record. It is
2138 significant that this is the only place where ERROR_END is
2139 generated. Reading an end of file elsewhere is either end of
2140 record or an I/O error. */
2142 if (dtp->u.p.current_unit->flags.access == ACCESS_SEQUENTIAL)
2143 switch (dtp->u.p.current_unit->endfile)
2149 if (!is_internal_unit (dtp))
2151 generate_error (&dtp->common, ERROR_END, NULL);
2152 dtp->u.p.current_unit->endfile = AFTER_ENDFILE;
2153 dtp->u.p.current_unit->current_record = 0;
2158 generate_error (&dtp->common, ERROR_ENDFILE, NULL);
2159 dtp->u.p.current_unit->current_record = 0;
2164 extern void st_read_done (st_parameter_dt *);
2165 export_proto(st_read_done);
2168 st_read_done (st_parameter_dt *dtp)
2170 finalize_transfer (dtp);
2171 free_format_data (dtp);
2173 if (dtp->u.p.scratch != NULL)
2174 free_mem (dtp->u.p.scratch);
2175 if (dtp->u.p.current_unit != NULL)
2176 unlock_unit (dtp->u.p.current_unit);
2180 extern void st_write (st_parameter_dt *);
2181 export_proto(st_write);
2184 st_write (st_parameter_dt *dtp)
2186 library_start (&dtp->common);
2187 data_transfer_init (dtp, 0);
2190 extern void st_write_done (st_parameter_dt *);
2191 export_proto(st_write_done);
2194 st_write_done (st_parameter_dt *dtp)
2196 finalize_transfer (dtp);
2198 /* Deal with endfile conditions associated with sequential files. */
2200 if (dtp->u.p.current_unit != NULL && dtp->u.p.current_unit->flags.access == ACCESS_SEQUENTIAL)
2201 switch (dtp->u.p.current_unit->endfile)
2203 case AT_ENDFILE: /* Remain at the endfile record. */
2207 dtp->u.p.current_unit->endfile = AT_ENDFILE; /* Just at it now. */
2211 if (dtp->u.p.current_unit->current_record > dtp->u.p.current_unit->last_record)
2213 /* Get rid of whatever is after this record. */
2214 if (struncate (dtp->u.p.current_unit->s) == FAILURE)
2215 generate_error (&dtp->common, ERROR_OS, NULL);
2218 dtp->u.p.current_unit->endfile = AT_ENDFILE;
2222 free_format_data (dtp);
2224 if (dtp->u.p.scratch != NULL)
2225 free_mem (dtp->u.p.scratch);
2226 if (dtp->u.p.current_unit != NULL)
2227 unlock_unit (dtp->u.p.current_unit);
2231 /* Receives the scalar information for namelist objects and stores it
2232 in a linked list of namelist_info types. */
2234 extern void st_set_nml_var (st_parameter_dt *dtp, void *, char *,
2235 GFC_INTEGER_4, gfc_charlen_type, GFC_INTEGER_4);
2236 export_proto(st_set_nml_var);
2240 st_set_nml_var (st_parameter_dt *dtp, void * var_addr, char * var_name,
2241 GFC_INTEGER_4 len, gfc_charlen_type string_length,
2242 GFC_INTEGER_4 dtype)
2244 namelist_info *t1 = NULL;
2247 nml = (namelist_info*) get_mem (sizeof (namelist_info));
2249 nml->mem_pos = var_addr;
2251 nml->var_name = (char*) get_mem (strlen (var_name) + 1);
2252 strcpy (nml->var_name, var_name);
2254 nml->len = (int) len;
2255 nml->string_length = (index_type) string_length;
2257 nml->var_rank = (int) (dtype & GFC_DTYPE_RANK_MASK);
2258 nml->size = (index_type) (dtype >> GFC_DTYPE_SIZE_SHIFT);
2259 nml->type = (bt) ((dtype & GFC_DTYPE_TYPE_MASK) >> GFC_DTYPE_TYPE_SHIFT);
2261 if (nml->var_rank > 0)
2263 nml->dim = (descriptor_dimension*)
2264 get_mem (nml->var_rank * sizeof (descriptor_dimension));
2265 nml->ls = (array_loop_spec*)
2266 get_mem (nml->var_rank * sizeof (array_loop_spec));
2276 if ((dtp->common.flags & IOPARM_DT_IONML_SET) == 0)
2278 dtp->common.flags |= IOPARM_DT_IONML_SET;
2279 dtp->u.p.ionml = nml;
2283 for (t1 = dtp->u.p.ionml; t1->next; t1 = t1->next);
2288 /* Store the dimensional information for the namelist object. */
2289 extern void st_set_nml_var_dim (st_parameter_dt *, GFC_INTEGER_4,
2290 GFC_INTEGER_4, GFC_INTEGER_4,
2292 export_proto(st_set_nml_var_dim);
2295 st_set_nml_var_dim (st_parameter_dt *dtp, GFC_INTEGER_4 n_dim,
2296 GFC_INTEGER_4 stride, GFC_INTEGER_4 lbound,
2297 GFC_INTEGER_4 ubound)
2299 namelist_info * nml;
2304 for (nml = dtp->u.p.ionml; nml->next; nml = nml->next);
2306 nml->dim[n].stride = (ssize_t)stride;
2307 nml->dim[n].lbound = (ssize_t)lbound;
2308 nml->dim[n].ubound = (ssize_t)ubound;
2311 /* Reverse memcpy - used for byte swapping. */
2313 void reverse_memcpy (void *dest, const void *src, size_t n)
2319 s = (char *) src + n - 1;
2321 /* Write with ascending order - this is likely faster
2322 on modern architectures because of write combining. */