-/* Copyright (C) 2002-2003, 2005, 2006 Free Software Foundation, Inc.
+/* Copyright (C) 2002-2003, 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
Contributed by Andy Vaught and Janne Blomqvist
This file is part of the GNU Fortran runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
+the Free Software Foundation; either version 3, or (at your option)
any later version.
-In addition to the permissions in the GNU General Public License, the
-Free Software Foundation gives you unlimited permission to link the
-compiled version of this file into combinations with other programs,
-and to distribute those combinations without any restriction coming
-from the use of this file. (The General Public License restrictions
-do apply in other respects; for example, they cover modification of
-the file, and distribution when not linked into a combine
-executable.)
-
Libgfortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with Libgfortran; see the file COPYING. If not, write to
-the Free Software Foundation, 51 Franklin Street, Fifth Floor,
-Boston, MA 02110-1301, USA. */
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
-#include "config.h"
-#include <string.h>
-#include "libgfortran.h"
#include "io.h"
+#include "fbuf.h"
+#include "unix.h"
+#include <string.h>
/* file_pos.c-- Implement the file positioning statements, i.e. BACKSPACE,
ENDFILE, and REWIND as well as the FLUSH statement. */
record, and we have to sift backwards to find the newline before
that or the start of the file, whichever comes first. */
-#define READ_CHUNK 4096
+static const int READ_CHUNK = 4096;
static void
formatted_backspace (st_parameter_filepos *fpp, gfc_unit *u)
{
gfc_offset base;
- char *p;
- int n;
+ char p[READ_CHUNK];
+ ssize_t n;
- base = file_position (u->s) - 1;
+ base = stell (u->s) - 1;
do
{
n = (base < READ_CHUNK) ? base : READ_CHUNK;
base -= n;
-
- p = salloc_r_at (u->s, &n, base);
- if (p == NULL)
+ if (sseek (u->s, base, SEEK_SET) < 0)
+ goto io_error;
+ if (sread (u->s, p, n) != n)
goto io_error;
/* We have moved backwards from the current position, it should
/* There is no memrchr() in the C library, so we have to do it
ourselves. */
- n--;
- while (n >= 0)
+ while (n > 0)
{
+ n--;
if (p[n] == '\n')
{
base += n + 1;
goto done;
}
- n--;
}
}
/* base is the new pointer. Seek to it exactly. */
done:
- if (sseek (u->s, base) == FAILURE)
+ if (sseek (u->s, base, SEEK_SET) < 0)
goto io_error;
u->last_record--;
u->endfile = NO_ENDFILE;
return;
io_error:
- generate_error (&fpp->common, ERROR_OS, NULL);
+ generate_error (&fpp->common, LIBERROR_OS, NULL);
}
/* unformatted_backspace(fpp) -- Move the file backwards for an unformatted
sequential file. We are guaranteed to be between records on entry and
- we have to shift to the previous record. */
+ we have to shift to the previous record. Loop over subrecords. */
static void
unformatted_backspace (st_parameter_filepos *fpp, gfc_unit *u)
{
- gfc_offset m, new;
- int length;
- char *p;
-
- length = sizeof (gfc_offset);
+ gfc_offset m, slen;
+ GFC_INTEGER_4 m4;
+ GFC_INTEGER_8 m8;
+ ssize_t length;
+ int continued;
+ char p[sizeof (GFC_INTEGER_8)];
+
+ if (compile_options.record_marker == 0)
+ length = sizeof (GFC_INTEGER_4);
+ else
+ length = compile_options.record_marker;
- p = salloc_r_at (u->s, &length,
- file_position (u->s) - length);
- if (p == NULL)
- goto io_error;
+ do
+ {
+ slen = - (gfc_offset) length;
+ if (sseek (u->s, slen, SEEK_CUR) < 0)
+ goto io_error;
+ if (sread (u->s, p, length) != length)
+ goto io_error;
+
+ /* Only GFC_CONVERT_NATIVE and GFC_CONVERT_SWAP are valid here. */
+ if (likely (u->flags.convert == GFC_CONVERT_NATIVE))
+ {
+ switch (length)
+ {
+ case sizeof(GFC_INTEGER_4):
+ memcpy (&m4, p, sizeof (m4));
+ m = m4;
+ break;
+
+ case sizeof(GFC_INTEGER_8):
+ memcpy (&m8, p, sizeof (m8));
+ m = m8;
+ break;
+
+ default:
+ runtime_error ("Illegal value for record marker");
+ break;
+ }
+ }
+ else
+ {
+ switch (length)
+ {
+ case sizeof(GFC_INTEGER_4):
+ reverse_memcpy (&m4, p, sizeof (m4));
+ m = m4;
+ break;
+
+ case sizeof(GFC_INTEGER_8):
+ reverse_memcpy (&m8, p, sizeof (m8));
+ m = m8;
+ break;
+
+ default:
+ runtime_error ("Illegal value for record marker");
+ break;
+ }
- /* Only CONVERT_NATIVE and CONVERT_SWAP are valid here. */
- if (u->flags.convert == CONVERT_NATIVE)
- memcpy (&m, p, sizeof (gfc_offset));
- else
- reverse_memcpy (&m, p, sizeof (gfc_offset));
+ }
- if ((new = file_position (u->s) - m - 2*length) < 0)
- new = 0;
+ continued = m < 0;
+ if (continued)
+ m = -m;
- if (sseek (u->s, new) == FAILURE)
- goto io_error;
+ if (sseek (u->s, -m -2 * length, SEEK_CUR) < 0)
+ goto io_error;
+ } while (continued);
u->last_record--;
return;
io_error:
- generate_error (&fpp->common, ERROR_OS, NULL);
+ generate_error (&fpp->common, LIBERROR_OS, NULL);
}
u = find_unit (fpp->common.unit);
if (u == NULL)
{
- generate_error (&fpp->common, ERROR_BAD_UNIT, NULL);
+ generate_error (&fpp->common, LIBERROR_BAD_UNIT, NULL);
goto done;
}
- /* Ignore direct access. Non-advancing I/O is only allowed for formatted
- sequential I/O and the next direct access transfer repositions the file
- anyway. */
+ /* Direct access is prohibited, and so is unformatted stream access. */
+
if (u->flags.access == ACCESS_DIRECT)
- goto done;
+ {
+ generate_error (&fpp->common, LIBERROR_OPTION_CONFLICT,
+ "Cannot BACKSPACE a file opened for DIRECT access");
+ goto done;
+ }
+ if (u->flags.access == ACCESS_STREAM && u->flags.form == FORM_UNFORMATTED)
+ {
+ generate_error (&fpp->common, LIBERROR_OPTION_CONFLICT,
+ "Cannot BACKSPACE an unformatted stream file");
+ goto done;
+ }
+
+ /* Make sure format buffer is flushed and reset. */
+ if (u->flags.form == FORM_FORMATTED)
+ {
+ int pos = fbuf_reset (u);
+ if (pos != 0)
+ sseek (u->s, pos, SEEK_CUR);
+ }
+
+
/* Check for special cases involving the ENDFILE record first. */
if (u->endfile == AFTER_ENDFILE)
{
u->endfile = AT_ENDFILE;
- flush (u->s);
- struncate (u->s);
+ u->flags.position = POSITION_APPEND;
+ sflush (u->s);
}
else
{
- if (file_position (u->s) == 0)
- goto done; /* Common special case */
+ if (stell (u->s) == 0)
+ {
+ u->flags.position = POSITION_REWIND;
+ goto done; /* Common special case */
+ }
if (u->mode == WRITING)
{
- flush (u->s);
- struncate (u->s);
+ /* If there are previously written bytes from a write with
+ ADVANCE="no", add a record marker before performing the
+ BACKSPACE. */
+
+ if (u->previous_nonadvancing_write)
+ finish_last_advance_record (u);
+
+ u->previous_nonadvancing_write = 0;
+
+ unit_truncate (u, stell (u->s), &fpp->common);
u->mode = READING;
}
else
unformatted_backspace (fpp, u);
+ u->flags.position = POSITION_UNSPECIFIED;
u->endfile = NO_ENDFILE;
u->current_record = 0;
u->bytes_left = 0;
u = find_unit (fpp->common.unit);
if (u != NULL)
{
+ if (u->flags.access == ACCESS_DIRECT)
+ {
+ generate_error (&fpp->common, LIBERROR_OPTION_CONFLICT,
+ "Cannot perform ENDFILE on a file opened"
+ " for DIRECT access");
+ goto done;
+ }
+
+ /* If there are previously written bytes from a write with ADVANCE="no",
+ add a record marker before performing the ENDFILE. */
+
+ if (u->previous_nonadvancing_write)
+ finish_last_advance_record (u);
+
+ u->previous_nonadvancing_write = 0;
+
if (u->current_record)
{
st_parameter_dt dtp;
next_record (&dtp, 1);
}
- flush (u->s);
- struncate (u->s);
+ unit_truncate (u, stell (u->s), &fpp->common);
u->endfile = AFTER_ENDFILE;
+ if (0 == stell (u->s))
+ u->flags.position = POSITION_REWIND;
+ done:
unlock_unit (u);
}
u = find_unit (fpp->common.unit);
if (u != NULL)
{
- if (u->flags.access != ACCESS_SEQUENTIAL)
- generate_error (&fpp->common, ERROR_BAD_OPTION,
+ if (u->flags.access == ACCESS_DIRECT)
+ generate_error (&fpp->common, LIBERROR_BAD_OPTION,
"Cannot REWIND a file opened for DIRECT access");
else
{
- /* Flush the buffers. If we have been writing to the file, the last
- written record is the last record in the file, so truncate the
- file now. Reset to read mode so two consecutive rewind
- statements do not delete the file contents. */
- flush (u->s);
- if (u->mode == WRITING)
- struncate (u->s);
+ /* If there are previously written bytes from a write with ADVANCE="no",
+ add a record marker before performing the ENDFILE. */
+
+ if (u->previous_nonadvancing_write)
+ finish_last_advance_record (u);
+
+ u->previous_nonadvancing_write = 0;
+
+ fbuf_reset (u);
- u->mode = READING;
u->last_record = 0;
- if (sseek (u->s, 0) == FAILURE)
- generate_error (&fpp->common, ERROR_OS, NULL);
- u->endfile = NO_ENDFILE;
+ if (sseek (u->s, 0, SEEK_SET) < 0)
+ generate_error (&fpp->common, LIBERROR_OS, NULL);
+
+ /* Handle special files like /dev/null differently. */
+ if (!is_special (u->s))
+ {
+ /* We are rewinding so we are not at the end. */
+ u->endfile = NO_ENDFILE;
+ }
+ else
+ {
+ /* Set this for compatibilty with g77 for /dev/null. */
+ if (file_length (u->s) == 0 && stell (u->s) == 0)
+ u->endfile = AT_ENDFILE;
+ /* Future refinements on special files can go here. */
+ }
+
u->current_record = 0;
- u->bytes_left = 0;
- test_endfile (u);
+ u->strm_pos = 1;
+ u->read_bad = 0;
}
/* Update position for INQUIRE. */
u->flags.position = POSITION_REWIND;
u = find_unit (fpp->common.unit);
if (u != NULL)
{
- flush (u->s);
+ /* Make sure format buffer is flushed. */
+ if (u->flags.form == FORM_FORMATTED)
+ fbuf_flush (u, u->mode);
+
+ sflush (u->s);
unlock_unit (u);
}
+ else
+ /* FLUSH on unconnected unit is illegal: F95 std., 9.3.5. */
+ generate_error (&fpp->common, LIBERROR_BAD_OPTION,
+ "Specified UNIT in FLUSH is not connected");
library_end ();
}
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