727 lines
12 KiB
C
727 lines
12 KiB
C
/* Copyright (C) 2002-2003 Free Software Foundation, Inc.
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Contributed by Andy Vaught
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This file is part of the GNU Fortran 95 runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Libgfortran; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "libgfortran.h"
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#include "io.h"
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/* read.c -- Deal with formatted reads */
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/* set_integer()-- All of the integer assignments come here to
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* actually place the value into memory. */
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void
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set_integer (void *dest, int64_t value, int length)
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{
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switch (length)
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{
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case 8:
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*((int64_t *) dest) = value;
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break;
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case 4:
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*((int32_t *) dest) = value;
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break;
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case 2:
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*((int16_t *) dest) = value;
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break;
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case 1:
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*((int8_t *) dest) = value;
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break;
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default:
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internal_error ("Bad integer kind");
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}
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}
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/* max_value()-- Given a length (kind), return the maximum signed or
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* unsigned value */
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uint64_t
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max_value (int length, int signed_flag)
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{
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uint64_t value;
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switch (length)
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{
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case 8:
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value = signed_flag ? 0x7fffffffffffffff : 0xffffffffffffffff;
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break;
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case 4:
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value = signed_flag ? 0x7fffffff : 0xffffffff;
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break;
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case 2:
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value = signed_flag ? 0x7fff : 0xffff;
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break;
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case 1:
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value = signed_flag ? 0x7f : 0xff;
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break;
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default:
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internal_error ("Bad integer kind");
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}
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return value;
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}
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/* convert_real()-- Convert a character representation of a floating
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* point number to the machine number. Returns nonzero if there is a
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* range problem during conversion. TODO: handle not-a-numbers and
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* infinities. */
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int
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convert_real (void *dest, const char *buffer, int length)
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{
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errno = 0;
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switch (length)
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{
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case 4:
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*((float *) dest) =
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#if defined(HAVE_STRTOF)
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strtof (buffer, NULL);
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#else
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(float) strtod (buffer, NULL);
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#endif
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break;
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case 8:
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*((double *) dest) = strtod (buffer, NULL);
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break;
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default:
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internal_error ("Unsupported real kind during IO");
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}
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if (errno != 0)
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{
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generate_error (ERROR_READ_VALUE,
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"Range error during floating point read");
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return 1;
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}
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return 0;
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}
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/* read_l()-- Read a logical value */
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void
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read_l (fnode * f, char *dest, int length)
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{
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char *p;
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int w;
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w = f->u.w;
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p = read_block (&w);
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if (p == NULL)
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return;
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while (*p == ' ')
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{
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if (--w == 0)
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goto bad;
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p++;
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}
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if (*p == '.')
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{
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if (--w == 0)
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goto bad;
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p++;
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}
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switch (*p)
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{
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case 't':
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case 'T':
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set_integer (dest, 1, length);
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break;
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case 'f':
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case 'F':
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set_integer (dest, 0, length);
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break;
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default:
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bad:
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generate_error (ERROR_READ_VALUE, "Bad value on logical read");
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break;
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}
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}
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/* read_a()-- Read a character record. This one is pretty easy. */
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void
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read_a (fnode * f, char *p, int length)
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{
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char *source;
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int w, m, n;
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w = f->u.w;
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if (w == -1) /* '(A)' edit descriptor */
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w = length;
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source = read_block (&w);
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if (source == NULL)
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return;
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if (w > length)
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source += (w - length);
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m = (w > length) ? length : w;
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memcpy (p, source, m);
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n = length - w;
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if (n > 0)
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memset (p + m, ' ', n);
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}
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/* eat_leading_spaces()-- Given a character pointer and a width,
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* ignore the leading spaces. */
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static char *
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eat_leading_spaces (int *width, char *p)
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{
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for (;;)
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{
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if (*width == 0 || *p != ' ')
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break;
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(*width)--;
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p++;
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}
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return p;
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}
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static char
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next_char (char **p, int *w)
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{
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char c, *q;
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if (*w == 0)
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return '\0';
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q = *p;
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c = *q++;
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*p = q;
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(*w)--;
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if (c != ' ')
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return c;
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if (g.blank_status == BLANK_ZERO)
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return '0';
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/* At this point, the rest of the field has to be trailing blanks */
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while (*w > 0)
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{
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if (*q++ != ' ')
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return '?';
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(*w)--;
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}
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*p = q;
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return '\0';
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}
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/* read_decimal()-- Read a decimal integer value. The values here are
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* signed values. */
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void
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read_decimal (fnode * f, char *dest, int length)
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{
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unsigned value, maxv, maxv_10;
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int v, w, negative;
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char c, *p;
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w = f->u.w;
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p = read_block (&w);
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if (p == NULL)
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return;
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p = eat_leading_spaces (&w, p);
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if (w == 0)
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{
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set_integer (dest, 0, length);
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return;
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}
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maxv = max_value (length, 1);
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maxv_10 = maxv / 10;
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negative = 0;
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value = 0;
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switch (*p)
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{
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case '-':
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negative = 1;
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/* Fall through */
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case '+':
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p++;
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if (--w == 0)
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goto bad;
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/* Fall through */
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default:
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break;
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}
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/* At this point we have a digit-string */
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value = 0;
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for (;;)
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{
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c = next_char (&p, &w);
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if (c == '\0')
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break;
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if (c < '0' || c > '9')
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goto bad;
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if (value > maxv_10)
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goto overflow;
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c -= '0';
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value = 10 * value;
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if (value > maxv - c)
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goto overflow;
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value += c;
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}
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v = (signed int) value;
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if (negative)
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v = -v;
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set_integer (dest, v, length);
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return;
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bad:
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generate_error (ERROR_READ_VALUE, "Bad value during integer read");
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return;
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overflow:
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generate_error (ERROR_READ_OVERFLOW,
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"Value overflowed during integer read");
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return;
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}
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/* read_radix()-- This function reads values for non-decimal radixes.
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* The difference here is that we treat the values here as unsigned
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* values for the purposes of overflow. If minus sign is present and
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* the top bit is set, the value will be incorrect. */
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void
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read_radix (fnode * f, char *dest, int length, int radix)
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{
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unsigned value, maxv, maxv_r;
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int v, w, negative;
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char c, *p;
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w = f->u.w;
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p = read_block (&w);
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if (p == NULL)
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return;
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p = eat_leading_spaces (&w, p);
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if (w == 0)
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{
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set_integer (dest, 0, length);
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return;
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}
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maxv = max_value (length, 0);
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maxv_r = maxv / radix;
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negative = 0;
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value = 0;
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switch (*p)
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{
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case '-':
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negative = 1;
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/* Fall through */
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case '+':
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p++;
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if (--w == 0)
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goto bad;
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/* Fall through */
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default:
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break;
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}
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/* At this point we have a digit-string */
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value = 0;
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for (;;)
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{
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c = next_char (&p, &w);
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if (c == '\0')
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break;
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switch (radix)
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{
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case 2:
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if (c < '0' || c > '1')
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goto bad;
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break;
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case 8:
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if (c < '0' || c > '7')
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goto bad;
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break;
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case 16:
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switch (c)
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{
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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break;
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case 'a':
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case 'b':
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case 'c':
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case 'd':
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case 'e':
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case 'f':
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c = c - 'a' + '9' + 1;
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break;
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case 'A':
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case 'B':
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case 'C':
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case 'D':
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case 'E':
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case 'F':
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c = c - 'A' + '9' + 1;
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break;
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default:
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goto bad;
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}
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break;
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}
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if (value > maxv_r)
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goto overflow;
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c -= '0';
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value = radix * value;
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if (maxv - c < value)
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goto overflow;
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value += c;
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}
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v = (signed int) value;
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if (negative)
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v = -v;
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set_integer (dest, v, length);
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return;
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bad:
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generate_error (ERROR_READ_VALUE, "Bad value during integer read");
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return;
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overflow:
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generate_error (ERROR_READ_OVERFLOW,
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"Value overflowed during integer read");
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return;
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}
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/* read_f()-- Read a floating point number with F-style editing, which
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is what all of the other floating point descriptors behave as. The
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tricky part is that optional spaces are allowed after an E or D,
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and the implicit decimal point if a decimal point is not present in
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the input. */
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void
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read_f (fnode * f, char *dest, int length)
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{
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int w, seen_dp, exponent;
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int exponent_sign, val_sign;
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int ndigits;
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int edigits;
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int i;
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char *p, *buffer;
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char *digits;
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val_sign = 1;
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seen_dp = 0;
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w = f->u.w;
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p = read_block (&w);
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if (p == NULL)
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return;
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p = eat_leading_spaces (&w, p);
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if (w == 0)
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{
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switch (length)
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{
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case 4:
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*((float *) dest) = 0.0f;
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break;
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case 8:
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*((double *) dest) = 0.0;
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break;
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default:
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internal_error ("Unsupported real kind during IO");
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}
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return;
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}
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/* Optional sign */
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if (*p == '-' || *p == '+')
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{
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if (*p == '-')
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val_sign = -1;
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p++;
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if (--w == 0)
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goto bad_float;
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}
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exponent_sign = 1;
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/* A digit (or a '.') is required at this point */
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if (!isdigit (*p) && *p != '.')
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goto bad_float;
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/* Remember the position of the first digit. */
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digits = p;
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ndigits = 0;
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/* Scan through the string to find the exponent. */
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while (w > 0)
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{
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switch (*p)
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{
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case '.':
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if (seen_dp)
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goto bad_float;
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seen_dp = 1;
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/* Fall through */
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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case ' ':
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ndigits++;
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*p++;
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w--;
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break;
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case '-':
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exponent_sign = -1;
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/* Fall through */
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case '+':
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p++;
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w--;
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goto exp2;
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case 'd':
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case 'e':
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case 'D':
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case 'E':
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p++;
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w--;
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goto exp1;
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default:
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goto bad_float;
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}
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}
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/* No exponent has been seen, so we use the current scale factor */
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exponent = -g.scale_factor;
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goto done;
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bad_float:
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generate_error (ERROR_READ_VALUE, "Bad value during floating point read");
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if (buffer != scratch)
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free_mem (buffer);
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return;
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/* At this point the start of an exponent has been found */
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exp1:
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while (w > 0 && *p == ' ')
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{
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w--;
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p++;
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}
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switch (*p)
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{
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case '-':
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exponent_sign = -1;
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/* Fall through */
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case '+':
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p++;
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w--;
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break;
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}
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if (w == 0)
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goto bad_float;
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/* At this point a digit string is required. We calculate the value
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of the exponent in order to take account of the scale factor and
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the d parameter before explict conversion takes place. */
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exp2:
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if (!isdigit (*p))
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goto bad_float;
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exponent = *p - '0';
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p++;
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w--;
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while (w > 0 && isdigit (*p))
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{
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exponent = 10 * exponent + *p - '0';
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p++;
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w--;
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}
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/* Only allow trailing blanks */
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while (w > 0)
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{
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if (*p != ' ')
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goto bad_float;
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p++;
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w--;
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}
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exponent = exponent * exponent_sign;
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done:
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/* Use the precision specified in the format if no decimal point has been
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seen. */
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if (!seen_dp)
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exponent -= f->u.real.d;
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if (exponent > 0)
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{
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edigits = 2;
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i = exponent;
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}
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else
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{
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edigits = 3;
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i = -exponent;
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}
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while (i >= 10)
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{
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i /= 10;
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edigits++;
|
|
}
|
|
|
|
i = ndigits + edigits + 1;
|
|
if (val_sign < 0)
|
|
i++;
|
|
|
|
if (i < SCRATCH_SIZE)
|
|
buffer = scratch;
|
|
else
|
|
buffer = get_mem (i);
|
|
|
|
/* Reformat the string into a temporary buffer. As we're using atof it's
|
|
easiest to just leave the dcimal point in place. */
|
|
p = buffer;
|
|
if (val_sign < 0)
|
|
*(p++) = '-';
|
|
for (; ndigits > 0; ndigits--)
|
|
{
|
|
if (*digits == ' ' && g.blank_status == BLANK_ZERO)
|
|
*p = '0';
|
|
else
|
|
*p = *digits;
|
|
p++;
|
|
digits++;
|
|
}
|
|
*(p++) = 'e';
|
|
sprintf (p, "%d", exponent);
|
|
|
|
/* Do the actual conversion. */
|
|
convert_real (dest, buffer, length);
|
|
|
|
if (buffer != scratch)
|
|
free_mem (buffer);
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
/* read_x()-- Deal with the X/TR descriptor. We just read some data
|
|
* and never look at it. */
|
|
|
|
void
|
|
read_x (fnode * f)
|
|
{
|
|
int n;
|
|
|
|
n = f->u.n;
|
|
read_block (&n);
|
|
}
|