1 /* Copyright (C) 2002-2003 Free Software Foundation, Inc.
2 Contributed by Andy Vaught
4 This file is part of the GNU Fortran 95 runtime library (libgfortran).
6 Libgfortran is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 Libgfortran is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with Libgfortran; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
27 #include "libgfortran.h"
30 /* read.c -- Deal with formatted reads */
32 /* set_integer()-- All of the integer assignments come here to
33 * actually place the value into memory. */
36 set_integer (void *dest
, int64_t value
, int length
)
42 *((int64_t *) dest
) = value
;
45 *((int32_t *) dest
) = value
;
48 *((int16_t *) dest
) = value
;
51 *((int8_t *) dest
) = value
;
54 internal_error ("Bad integer kind");
59 /* max_value()-- Given a length (kind), return the maximum signed or
63 max_value (int length
, int signed_flag
)
70 value
= signed_flag
? 0x7fffffffffffffff : 0xffffffffffffffff;
73 value
= signed_flag
? 0x7fffffff : 0xffffffff;
76 value
= signed_flag
? 0x7fff : 0xffff;
79 value
= signed_flag
? 0x7f : 0xff;
82 internal_error ("Bad integer kind");
89 /* convert_real()-- Convert a character representation of a floating
90 * point number to the machine number. Returns nonzero if there is a
91 * range problem during conversion. TODO: handle not-a-numbers and
92 * infinities. Handling of kind 4 is probably wrong because of double
96 convert_real (void *dest
, const char *buffer
, int length
)
104 *((float *) dest
) = (float) strtod (buffer
, NULL
);
107 *((double *) dest
) = strtod (buffer
, NULL
);
110 internal_error ("Bad real number kind");
115 generate_error (ERROR_READ_VALUE
,
116 "Range error during floating point read");
124 convert_precision_real (void *dest
, int sign
,
125 char *buffer
, int length
, int exponent
)
127 int w
, new_dp_pos
, i
, slen
, k
, dp
;
137 slen
= strlen (buffer
);
141 /* for (i = w - 1; i > 0; i --)
143 if (buffer[i] == '0' || buffer[i] == 0)
149 for (i
= 0; i
< w
; i
++)
151 if (buffer
[i
] == '.')
156 new_dp_pos
+= exponent
;
173 fval
= fval
* 10.0 + c
- '0';
194 i
= new_dp_pos
- slen
+ dp
;
219 *((float *) dest
) = (float)fval
;
222 *((double *) dest
) = fval
;
225 internal_error ("Bad real number kind");
232 /* read_l()-- Read a logical value */
235 read_l (fnode
* f
, char *dest
, int length
)
263 set_integer (dest
, 1, length
);
267 set_integer (dest
, 0, length
);
271 generate_error (ERROR_READ_VALUE
, "Bad value on logical read");
277 /* read_a()-- Read a character record. This one is pretty easy. */
280 read_a (fnode
* f
, char *p
, int length
)
286 if (w
== -1) /* '(A)' edit descriptor */
289 source
= read_block (&w
);
293 source
+= (w
- length
);
295 m
= (w
> length
) ? length
: w
;
296 memcpy (p
, source
, m
);
300 memset (p
+ m
, ' ', n
);
304 /* eat_leading_spaces()-- Given a character pointer and a width,
305 * ignore the leading spaces. */
308 eat_leading_spaces (int *width
, char *p
)
313 if (*width
== 0 || *p
!= ' ')
325 next_char (char **p
, int *w
)
340 if (g
.blank_status
== BLANK_ZERO
)
343 /* At this point, the rest of the field has to be trailing blanks */
357 /* read_decimal()-- Read a decimal integer value. The values here are
361 read_decimal (fnode
* f
, char *dest
, int length
)
363 unsigned value
, maxv
, maxv_10
;
372 p
= eat_leading_spaces (&w
, p
);
375 set_integer (dest
, 0, length
);
379 maxv
= max_value (length
, 1);
401 /* At this point we have a digit-string */
406 c
= next_char (&p
, &w
);
410 if (c
< '0' || c
> '9')
419 if (value
> maxv
- c
)
424 v
= (signed int) value
;
428 set_integer (dest
, v
, length
);
432 generate_error (ERROR_READ_VALUE
, "Bad value during integer read");
436 generate_error (ERROR_READ_OVERFLOW
,
437 "Value overflowed during integer read");
442 /* read_radix()-- This function reads values for non-decimal radixes.
443 * The difference here is that we treat the values here as unsigned
444 * values for the purposes of overflow. If minus sign is present and
445 * the top bit is set, the value will be incorrect. */
448 read_radix (fnode
* f
, char *dest
, int length
, int radix
)
450 unsigned value
, maxv
, maxv_r
;
459 p
= eat_leading_spaces (&w
, p
);
462 set_integer (dest
, 0, length
);
466 maxv
= max_value (length
, 0);
467 maxv_r
= maxv
/ radix
;
488 /* At this point we have a digit-string */
493 c
= next_char (&p
, &w
);
500 if (c
< '0' || c
> '1')
505 if (c
< '0' || c
> '7')
530 c
= c
- 'a' + '9' + 1;
539 c
= c
- 'A' + '9' + 1;
553 value
= radix
* value
;
555 if (maxv
- c
< value
)
560 v
= (signed int) value
;
564 set_integer (dest
, v
, length
);
568 generate_error (ERROR_READ_VALUE
, "Bad value during integer read");
572 generate_error (ERROR_READ_OVERFLOW
,
573 "Value overflowed during integer read");
578 /* read_f()-- Read a floating point number with F-style editing, which
579 * is what all of the other floating point descriptors behave as. The
580 * tricky part is that optional spaces are allowed after an E or D,
581 * and the implicit decimal point if a decimal point is not present in
585 read_f (fnode
* f
, char *dest
, int length
)
587 int w
, seen_dp
, exponent
;
588 int exponent_sign
, val_sign
;
589 char *p
, *buffer
, *n
;
598 p
= eat_leading_spaces (&w
, p
);
604 *((float *) dest
) = 0.0;
608 *((double *) dest
) = 0.0;
615 if (w
+ 2 < SCRATCH_SIZE
)
618 buffer
= get_mem (w
+ 2);
620 memset(buffer
, 0, w
+ 2);
626 if (*p
== '-' || *p
== '+')
638 /* A digit (or a '.') is required at this point */
640 if (!isdigit (*p
) && *p
!= '.')
671 if (g
.blank_status
== BLANK_ZERO
)
699 /* No exponent has been seen, so we use the current scale factor */
701 exponent
= -g
.scale_factor
;
705 generate_error (ERROR_READ_VALUE
, "Bad value during floating point read");
706 if (buffer
!= scratch
)
710 /* At this point the start of an exponent has been found */
713 while (w
> 0 && *p
== ' ')
734 /* At this point a digit string is required. We calculate the value
735 * of the exponent in order to take account of the scale factor and
736 * the d parameter before explict conversion takes place. */
746 while (w
> 0 && isdigit (*p
))
748 exponent
= 10 * exponent
+ *p
- '0';
749 if (exponent
> 999999)
756 /* Only allow trailing blanks */
766 exponent
= exponent
* exponent_sign
;
770 exponent
-= f
->u
.real
.d
;
772 /* The number is syntactically correct and ready for conversion.
773 * The only thing that can go wrong at this point is overflow or
776 convert_precision_real (dest
, val_sign
, buffer
, length
, exponent
);
778 if (buffer
!= scratch
)
785 /* read_x()-- Deal with the X/TR descriptor. We just read some data
786 * and never look at it. */