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/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
   Contributed by Andy Vaught
 
This file is part of the GNU Fortran 95 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)
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.  */
 
 
#include "config.h"
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include "libgfortran.h"
#include "io.h"
 
/* read.c -- Deal with formatted reads */
 
/* set_integer()-- All of the integer assignments come here to
 * actually place the value into memory.  */
 
void
set_integer (void *dest, GFC_INTEGER_LARGEST value, int length)
{
  switch (length)
    {
#ifdef HAVE_GFC_INTEGER_16
    case 16:
      {
        GFC_INTEGER_16 tmp = value;
        memcpy (dest, (void *) &tmp, length);
      }
      break;
#endif
    case 8:
      {
        GFC_INTEGER_8 tmp = value;
        memcpy (dest, (void *) &tmp, length);
      }
      break;
    case 4:
      {
        GFC_INTEGER_4 tmp = value;
        memcpy (dest, (void *) &tmp, length);
      }
      break;
    case 2:
      {
        GFC_INTEGER_2 tmp = value;
        memcpy (dest, (void *) &tmp, length);
      }
      break;
    case 1:
      {
        GFC_INTEGER_1 tmp = value;
        memcpy (dest, (void *) &tmp, length);
      }
      break;
    default:
      internal_error (NULL, "Bad integer kind");
    }
}
 
 
/* max_value()-- Given a length (kind), return the maximum signed or
 * unsigned value */
 
GFC_UINTEGER_LARGEST
max_value (int length, int signed_flag)
{
  GFC_UINTEGER_LARGEST value;
  int n;
 
  switch (length)
    {
#if defined HAVE_GFC_REAL_16 || defined HAVE_GFC_REAL_10
    case 16:
    case 10:
      value = 1;
      for (n = 1; n < 4 * length; n++)
        value = (value << 2) + 3;
      if (! signed_flag)
        value = 2*value+1;
      break;
#endif
    case 8:
      value = signed_flag ? 0x7fffffffffffffff : 0xffffffffffffffff;
      break;
    case 4:
      value = signed_flag ? 0x7fffffff : 0xffffffff;
      break;
    case 2:
      value = signed_flag ? 0x7fff : 0xffff;
      break;
    case 1:
      value = signed_flag ? 0x7f : 0xff;
      break;
    default:
      internal_error (NULL, "Bad integer kind");
    }
 
  return value;
}
 
 
/* convert_real()-- Convert a character representation of a floating
 * point number to the machine number.  Returns nonzero if there is a
 * range problem during conversion.  TODO: handle not-a-numbers and
 * infinities.  */
 
int
convert_real (st_parameter_dt *dtp, void *dest, const char *buffer, int length)
{
  errno = 0;
 
  switch (length)
    {
    case 4:
      {
        GFC_REAL_4 tmp =
#if defined(HAVE_STRTOF)
          strtof (buffer, NULL);
#else
          (GFC_REAL_4) strtod (buffer, NULL);
#endif
        memcpy (dest, (void *) &tmp, length);
      }
      break;
    case 8:
      {
        GFC_REAL_8 tmp = strtod (buffer, NULL);
        memcpy (dest, (void *) &tmp, length);
      }
      break;
#if defined(HAVE_GFC_REAL_10) && defined (HAVE_STRTOLD)
    case 10:
      {
        GFC_REAL_10 tmp = strtold (buffer, NULL);
        memcpy (dest, (void *) &tmp, length);
      }
      break;
#endif
#if defined(HAVE_GFC_REAL_16) && defined (HAVE_STRTOLD)
    case 16:
      {
        GFC_REAL_16 tmp = strtold (buffer, NULL);
        memcpy (dest, (void *) &tmp, length);
      }
      break;
#endif
    default:
      internal_error (&dtp->common, "Unsupported real kind during IO");
    }
 
  if (errno != 0 && errno != EINVAL)
    {
      generate_error (&dtp->common, ERROR_READ_VALUE,
                      "Range error during floating point read");
      return 1;
    }
 
  return 0;
}
 
 
/* read_l()-- Read a logical value */
 
void
read_l (st_parameter_dt *dtp, const fnode *f, char *dest, int length)
{
  char *p;
  int w;
 
  w = f->u.w;
  p = read_block (dtp, &w);
  if (p == NULL)
    return;
 
  while (*p == ' ')
    {
      if (--w == 0)
        goto bad;
      p++;
    }
 
  if (*p == '.')
    {
      if (--w == 0)
        goto bad;
      p++;
    }
 
  switch (*p)
    {
    case 't':
    case 'T':
      set_integer (dest, (GFC_INTEGER_LARGEST) 1, length);
      break;
    case 'f':
    case 'F':
      set_integer (dest, (GFC_INTEGER_LARGEST) 0, length);
      break;
    default:
    bad:
      generate_error (&dtp->common, ERROR_READ_VALUE,
                      "Bad value on logical read");
      break;
    }
}
 
 
/* read_a()-- Read a character record.  This one is pretty easy. */
 
void
read_a (st_parameter_dt *dtp, const fnode *f, char *p, int length)
{
  char *source;
  int w, m, n;
 
  w = f->u.w;
  if (w == -1) /* '(A)' edit descriptor  */
    w = length;
 
  dtp->u.p.sf_read_comma = 0;
  source = read_block (dtp, &w);
  dtp->u.p.sf_read_comma = 1;
  if (source == NULL)
    return;
  if (w > length)
     source += (w - length);
 
  m = (w > length) ? length : w;
  memcpy (p, source, m);
 
  n = length - w;
  if (n > 0)
    memset (p + m, ' ', n);
}
 
 
/* eat_leading_spaces()-- Given a character pointer and a width,
 * ignore the leading spaces.  */
 
static char *
eat_leading_spaces (int *width, char *p)
{
  for (;;)
    {
      if (*width == 0 || *p != ' ')
        break;
 
      (*width)--;
      p++;
    }
 
  return p;
}
 
 
static char
next_char (st_parameter_dt *dtp, char **p, int *w)
{
  char c, *q;
 
  if (*w == 0)
    return '\0';
 
  q = *p;
  c = *q++;
  *p = q;
 
  (*w)--;
 
  if (c != ' ')
    return c;
  if (dtp->u.p.blank_status != BLANK_UNSPECIFIED)
    return ' ';  /* return a blank to signal a null */
 
  /* At this point, the rest of the field has to be trailing blanks */
 
  while (*w > 0)
    {
      if (*q++ != ' ')
        return '?';
      (*w)--;
    }
 
  *p = q;
  return '\0';
}
 
 
/* read_decimal()-- Read a decimal integer value.  The values here are
 * signed values. */
 
void
read_decimal (st_parameter_dt *dtp, const fnode *f, char *dest, int length)
{
  GFC_UINTEGER_LARGEST value, maxv, maxv_10;
  GFC_INTEGER_LARGEST v;
  int w, negative;
  char c, *p;
 
  w = f->u.w;
  p = read_block (dtp, &w);
  if (p == NULL)
    return;
 
  p = eat_leading_spaces (&w, p);
  if (w == 0)
    {
      set_integer (dest, (GFC_INTEGER_LARGEST) 0, length);
      return;
    }
 
  maxv = max_value (length, 1);
  maxv_10 = maxv / 10;
 
  negative = 0;
  value = 0;
 
  switch (*p)
    {
    case '-':
      negative = 1;
      /* Fall through */
 
    case '+':
      p++;
      if (--w == 0)
        goto bad;
      /* Fall through */
 
    default:
      break;
    }
 
  /* At this point we have a digit-string */
  value = 0;
 
  for (;;)
    {
      c = next_char (dtp, &p, &w);
      if (c == '\0')
        break;
 
      if (c == ' ')
        {
          if (dtp->u.p.blank_status == BLANK_NULL) continue;
          if (dtp->u.p.blank_status == BLANK_ZERO) c = '0';
        }
 
      if (c < '0' || c > '9')
        goto bad;
 
      if (value > maxv_10)
        goto overflow;
 
      c -= '0';
      value = 10 * value;
 
      if (value > maxv - c)
        goto overflow;
      value += c;
    }
 
  v = value;
  if (negative)
    v = -v;
 
  set_integer (dest, v, length);
  return;
 
 bad:
  generate_error (&dtp->common, ERROR_READ_VALUE,
                  "Bad value during integer read");
  return;
 
 overflow:
  generate_error (&dtp->common, ERROR_READ_OVERFLOW,
                  "Value overflowed during integer read");
  return;
}
 
 
/* read_radix()-- This function reads values for non-decimal radixes.
 * The difference here is that we treat the values here as unsigned
 * values for the purposes of overflow.  If minus sign is present and
 * the top bit is set, the value will be incorrect. */
 
void
read_radix (st_parameter_dt *dtp, const fnode *f, char *dest, int length,
            int radix)
{
  GFC_UINTEGER_LARGEST value, maxv, maxv_r;
  GFC_INTEGER_LARGEST v;
  int w, negative;
  char c, *p;
 
  w = f->u.w;
  p = read_block (dtp, &w);
  if (p == NULL)
    return;
 
  p = eat_leading_spaces (&w, p);
  if (w == 0)
    {
      set_integer (dest, (GFC_INTEGER_LARGEST) 0, length);
      return;
    }
 
  maxv = max_value (length, 0);
  maxv_r = maxv / radix;
 
  negative = 0;
  value = 0;
 
  switch (*p)
    {
    case '-':
      negative = 1;
      /* Fall through */
 
    case '+':
      p++;
      if (--w == 0)
        goto bad;
      /* Fall through */
 
    default:
      break;
    }
 
  /* At this point we have a digit-string */
  value = 0;
 
  for (;;)
    {
      c = next_char (dtp, &p, &w);
      if (c == '\0')
        break;
      if (c == ' ')
        {
          if (dtp->u.p.blank_status == BLANK_NULL) continue;
          if (dtp->u.p.blank_status == BLANK_ZERO) c = '0';
        }
 
      switch (radix)
        {
        case 2:
          if (c < '0' || c > '1')
            goto bad;
          break;
 
        case 8:
          if (c < '0' || c > '7')
            goto bad;
          break;
 
        case 16:
          switch (c)
            {
            case '0':
            case '1':
            case '2':
            case '3':
            case '4':
            case '5':
            case '6':
            case '7':
            case '8':
            case '9':
              break;
 
            case 'a':
            case 'b':
            case 'c':
            case 'd':
            case 'e':
            case 'f':
              c = c - 'a' + '9' + 1;
              break;
 
            case 'A':
            case 'B':
            case 'C':
            case 'D':
            case 'E':
            case 'F':
              c = c - 'A' + '9' + 1;
              break;
 
            default:
              goto bad;
            }
 
          break;
        }
 
      if (value > maxv_r)
        goto overflow;
 
      c -= '0';
      value = radix * value;
 
      if (maxv - c < value)
        goto overflow;
      value += c;
    }
 
  v = value;
  if (negative)
    v = -v;
 
  set_integer (dest, v, length);
  return;
 
 bad:
  generate_error (&dtp->common, ERROR_READ_VALUE,
                  "Bad value during integer read");
  return;
 
 overflow:
  generate_error (&dtp->common, ERROR_READ_OVERFLOW,
                  "Value overflowed during integer read");
  return;
}
 
 
/* read_f()-- Read a floating point number with F-style editing, which
   is what all of the other floating point descriptors behave as.  The
   tricky part is that optional spaces are allowed after an E or D,
   and the implicit decimal point if a decimal point is not present in
   the input.  */
 
void
read_f (st_parameter_dt *dtp, const fnode *f, char *dest, int length)
{
  int w, seen_dp, exponent;
  int exponent_sign, val_sign;
  int ndigits;
  int edigits;
  int i;
  char *p, *buffer;
  char *digits;
  char scratch[SCRATCH_SIZE];
 
  val_sign = 1;
  seen_dp = 0;
  w = f->u.w;
  p = read_block (dtp, &w);
  if (p == NULL)
    return;
 
  p = eat_leading_spaces (&w, p);
  if (w == 0)
    goto zero;
 
  /* Optional sign */
 
  if (*p == '-' || *p == '+')
    {
      if (*p == '-')
        val_sign = -1;
      p++;
      w--;
    }
 
  exponent_sign = 1;
  p = eat_leading_spaces (&w, p);
  if (w == 0)
    goto zero;
 
  /* A digit, a '.' or a exponent character ('e', 'E', 'd' or 'D')
     is required at this point */
 
  if (!isdigit (*p) && *p != '.' && *p != 'd' && *p != 'D'
      && *p != 'e' && *p != 'E')
    goto bad_float;
 
  /* Remember the position of the first digit.  */
  digits = p;
  ndigits = 0;
 
  /* Scan through the string to find the exponent.  */
  while (w > 0)
    {
      switch (*p)
        {
        case '.':
          if (seen_dp)
            goto bad_float;
          seen_dp = 1;
          /* Fall through */
 
        case '0':
        case '1':
        case '2':
        case '3':
        case '4':
        case '5':
        case '6':
        case '7':
        case '8':
        case '9':
        case ' ':
          ndigits++;
          p++;
          w--;
          break;
 
        case '-':
          exponent_sign = -1;
          /* Fall through */
 
        case '+':
          p++;
          w--;
          goto exp2;
 
        case 'd':
        case 'e':
        case 'D':
        case 'E':
          p++;
          w--;
          goto exp1;
 
        default:
          goto bad_float;
        }
    }
 
  /* No exponent has been seen, so we use the current scale factor */
  exponent = -dtp->u.p.scale_factor;
  goto done;
 
 bad_float:
  generate_error (&dtp->common, ERROR_READ_VALUE,
                  "Bad value during floating point read");
  return;
 
  /* The value read is zero */
 zero:
  switch (length)
    {
      case 4:
        *((GFC_REAL_4 *) dest) = 0;
        break;
 
      case 8:
        *((GFC_REAL_8 *) dest) = 0;
        break;
 
#ifdef HAVE_GFC_REAL_10
      case 10:
        *((GFC_REAL_10 *) dest) = 0;
        break;
#endif
 
#ifdef HAVE_GFC_REAL_16
      case 16:
        *((GFC_REAL_16 *) dest) = 0;
        break;
#endif
 
      default:
        internal_error (&dtp->common, "Unsupported real kind during IO");
    }
  return;
 
  /* At this point the start of an exponent has been found */
 exp1:
  while (w > 0 && *p == ' ')
    {
      w--;
      p++;
    }
 
  switch (*p)
    {
    case '-':
      exponent_sign = -1;
      /* Fall through */
 
    case '+':
      p++;
      w--;
      break;
    }
 
  if (w == 0)
    goto bad_float;
 
  /* At this point a digit string is required.  We calculate the value
     of the exponent in order to take account of the scale factor and
     the d parameter before explict conversion takes place. */
 exp2:
  if (!isdigit (*p))
    goto bad_float;
 
  exponent = *p - '0';
  p++;
  w--;
 
  if (dtp->u.p.blank_status == BLANK_UNSPECIFIED) /* Normal processing of exponent */
    {
      while (w > 0 && isdigit (*p))
        {
          exponent = 10 * exponent + *p - '0';
          p++;
          w--;
        }
 
      /* Only allow trailing blanks */
 
      while (w > 0)
        {
          if (*p != ' ')
          goto bad_float;
          p++;
          w--;
        }
    }
  else  /* BZ or BN status is enabled */
    {
      while (w > 0)
        {
          if (*p == ' ')
            {
              if (dtp->u.p.blank_status == BLANK_ZERO) *p = '0';
              if (dtp->u.p.blank_status == BLANK_NULL)
                {
                  p++;
                  w--;
                  continue;
                }
            }
          else if (!isdigit (*p))
            goto bad_float;
 
          exponent = 10 * exponent + *p - '0';
          p++;
          w--;
        }
    }
 
  exponent = exponent * exponent_sign;
 
 done:
  /* Use the precision specified in the format if no decimal point has been
     seen.  */
  if (!seen_dp)
    exponent -= f->u.real.d;
 
  if (exponent > 0)
    {
      edigits = 2;
      i = exponent;
    }
  else
    {
      edigits = 3;
      i = -exponent;
    }
 
  while (i >= 10)
    {
      i /= 10;
      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 decimal point in place.  */
  p = buffer;
  if (val_sign < 0)
    *(p++) = '-';
  for (; ndigits > 0; ndigits--)
    {
      if (*digits == ' ')
        {
          if (dtp->u.p.blank_status == BLANK_ZERO) *digits = '0';
          if (dtp->u.p.blank_status == BLANK_NULL)
            {
              digits++;
              continue;
            }
        }
      *p = *digits;
      p++;
      digits++;
    }
  *(p++) = 'e';
  sprintf (p, "%d", exponent);
 
  /* Do the actual conversion.  */
  convert_real (dtp, 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 (st_parameter_dt *dtp, int n)
{
  if ((dtp->u.p.current_unit->flags.pad == PAD_NO || is_internal_unit (dtp))
      && dtp->u.p.current_unit->bytes_left < n)
    n = dtp->u.p.current_unit->bytes_left;
 
  dtp->u.p.sf_read_comma = 0;
  if (n > 0)
    read_sf (dtp, &n, 1);
  dtp->u.p.sf_read_comma = 1;
 
}

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[/] [scarts/] [trunk/] [toolchain/] [scarts-gcc/] [gcc-4.1.1/] [libgfortran/] [io/] [read.c] - Blame information for rev 14

Line No.	Rev	Author	Line
1	14	jlechner	`/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.`
2			`Contributed by Andy Vaught`
3
4			`This file is part of the GNU Fortran 95 runtime library (libgfortran).`
5
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)`
9			`any later version.`
10
11			`In addition to the permissions in the GNU General Public License, the`
12			`Free Software Foundation gives you unlimited permission to link the`
13			`compiled version of this file into combinations with other programs,`
14			`and to distribute those combinations without any restriction coming`
15			`from the use of this file. (The General Public License restrictions`
16			`do apply in other respects; for example, they cover modification of`
17			`the file, and distribution when not linked into a combine`
18			`executable.)`
19
20			`Libgfortran is distributed in the hope that it will be useful,`
21			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
22			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
23			`GNU General Public License for more details.`
24
25			`You should have received a copy of the GNU General Public License`
26			`along with Libgfortran; see the file COPYING. If not, write to`
27			`the Free Software Foundation, 51 Franklin Street, Fifth Floor,`
28			`Boston, MA 02110-1301, USA. */`
29
30
31			`#include "config.h"`
32			`#include <string.h>`
33			`#include <errno.h>`
34			`#include <ctype.h>`
35			`#include <stdlib.h>`
36			`#include <stdio.h>`
37			`#include "libgfortran.h"`
38			`#include "io.h"`
39
40			`/* read.c -- Deal with formatted reads */`
41
42			`/* set_integer()-- All of the integer assignments come here to`
43			`* actually place the value into memory. */`
44
45			`void`
46			`set_integer (void *dest, GFC_INTEGER_LARGEST value, int length)`
47			`{`
48			`switch (length)`
49			`{`
50			`#ifdef HAVE_GFC_INTEGER_16`
51			`case 16:`
52			`{`
53			`GFC_INTEGER_16 tmp = value;`
54			`memcpy (dest, (void *) &tmp, length);`
55			`}`
56			`break;`
57			`#endif`
58			`case 8:`
59			`{`
60			`GFC_INTEGER_8 tmp = value;`
61			`memcpy (dest, (void *) &tmp, length);`
62			`}`
63			`break;`
64			`case 4:`
65			`{`
66			`GFC_INTEGER_4 tmp = value;`
67			`memcpy (dest, (void *) &tmp, length);`
68			`}`
69			`break;`
70			`case 2:`
71			`{`
72			`GFC_INTEGER_2 tmp = value;`
73			`memcpy (dest, (void *) &tmp, length);`
74			`}`
75			`break;`
76			`case 1:`
77			`{`
78			`GFC_INTEGER_1 tmp = value;`
79			`memcpy (dest, (void *) &tmp, length);`
80			`}`
81			`break;`
82			`default:`
83			`internal_error (NULL, "Bad integer kind");`
84			`}`
85			`}`
86
87
88			`/* max_value()-- Given a length (kind), return the maximum signed or`
89			`* unsigned value */`
90
91			`GFC_UINTEGER_LARGEST`
92			`max_value (int length, int signed_flag)`
93			`{`
94			`GFC_UINTEGER_LARGEST value;`
95			`int n;`
96
97			`switch (length)`
98			`{`
99			`#if defined HAVE_GFC_REAL_16 \|\| defined HAVE_GFC_REAL_10`
100			`case 16:`
101			`case 10:`
102			`value = 1;`
103			`for (n = 1; n < 4 * length; n++)`
104			`value = (value << 2) + 3;`
105			`if (! signed_flag)`
106			`value = 2*value+1;`
107			`break;`
108			`#endif`
109			`case 8:`
110			`value = signed_flag ? 0x7fffffffffffffff : 0xffffffffffffffff;`
111			`break;`
112			`case 4:`
113			`value = signed_flag ? 0x7fffffff : 0xffffffff;`
114			`break;`
115			`case 2:`
116			`value = signed_flag ? 0x7fff : 0xffff;`
117			`break;`
118			`case 1:`
119			`value = signed_flag ? 0x7f : 0xff;`
120			`break;`
121			`default:`
122			`internal_error (NULL, "Bad integer kind");`
123			`}`
124
125			`return value;`
126			`}`
127
128
129			`/* convert_real()-- Convert a character representation of a floating`
130			`* point number to the machine number. Returns nonzero if there is a`
131			`* range problem during conversion. TODO: handle not-a-numbers and`
132			`* infinities. */`
133
134			`int`
135			`convert_real (st_parameter_dt dtp, void dest, const char *buffer, int length)`
136			`{`
137			`errno = 0;`
138
139			`switch (length)`
140			`{`
141			`case 4:`
142			`{`
143			`GFC_REAL_4 tmp =`
144			`#if defined(HAVE_STRTOF)`
145			`strtof (buffer, NULL);`
146			`#else`
147			`(GFC_REAL_4) strtod (buffer, NULL);`
148			`#endif`
149			`memcpy (dest, (void *) &tmp, length);`
150			`}`
151			`break;`
152			`case 8:`
153			`{`
154			`GFC_REAL_8 tmp = strtod (buffer, NULL);`
155			`memcpy (dest, (void *) &tmp, length);`
156			`}`
157			`break;`
158			`#if defined(HAVE_GFC_REAL_10) && defined (HAVE_STRTOLD)`
159			`case 10:`
160			`{`
161			`GFC_REAL_10 tmp = strtold (buffer, NULL);`
162			`memcpy (dest, (void *) &tmp, length);`
163			`}`
164			`break;`
165			`#endif`
166			`#if defined(HAVE_GFC_REAL_16) && defined (HAVE_STRTOLD)`
167			`case 16:`
168			`{`
169			`GFC_REAL_16 tmp = strtold (buffer, NULL);`
170			`memcpy (dest, (void *) &tmp, length);`
171			`}`
172			`break;`
173			`#endif`
174			`default:`
175			`internal_error (&dtp->common, "Unsupported real kind during IO");`
176			`}`
177
178			`if (errno != 0 && errno != EINVAL)`
179			`{`
180			`generate_error (&dtp->common, ERROR_READ_VALUE,`
181			`"Range error during floating point read");`
182			`return 1;`
183			`}`
184
185			`return 0;`
186			`}`
187
188
189			`/* read_l()-- Read a logical value */`
190
191			`void`
192			`read_l (st_parameter_dt dtp, const fnode f, char *dest, int length)`
193			`{`
194			`char *p;`
195			`int w;`
196
197			`w = f->u.w;`
198			`p = read_block (dtp, &w);`
199			`if (p == NULL)`
200			`return;`
201
202			`while (*p == ' ')`
203			`{`
204			`if (--w == 0)`
205			`goto bad;`
206			`p++;`
207			`}`
208
209			`if (*p == '.')`
210			`{`
211			`if (--w == 0)`
212			`goto bad;`
213			`p++;`
214			`}`
215
216			`switch (*p)`
217			`{`
218			`case 't':`
219			`case 'T':`
220			`set_integer (dest, (GFC_INTEGER_LARGEST) 1, length);`
221			`break;`
222			`case 'f':`
223			`case 'F':`
224			`set_integer (dest, (GFC_INTEGER_LARGEST) 0, length);`
225			`break;`
226			`default:`
227			`bad:`
228			`generate_error (&dtp->common, ERROR_READ_VALUE,`
229			`"Bad value on logical read");`
230			`break;`
231			`}`
232			`}`
233
234
235			`/* read_a()-- Read a character record. This one is pretty easy. */`
236
237			`void`
238			`read_a (st_parameter_dt dtp, const fnode f, char *p, int length)`
239			`{`
240			`char *source;`
241			`int w, m, n;`
242
243			`w = f->u.w;`
244			`if (w == -1) /* '(A)' edit descriptor */`
245			`w = length;`
246
247			`dtp->u.p.sf_read_comma = 0;`
248			`source = read_block (dtp, &w);`
249			`dtp->u.p.sf_read_comma = 1;`
250			`if (source == NULL)`
251			`return;`
252			`if (w > length)`
253			`source += (w - length);`
254
255			`m = (w > length) ? length : w;`
256			`memcpy (p, source, m);`
257
258			`n = length - w;`
259			`if (n > 0)`
260			`memset (p + m, ' ', n);`
261			`}`
262
263
264			`/* eat_leading_spaces()-- Given a character pointer and a width,`
265			`* ignore the leading spaces. */`
266
267			`static char *`
268			`eat_leading_spaces (int width, char p)`
269			`{`
270			`for (;;)`
271			`{`
272			`if (width == 0 \|\| p != ' ')`
273			`break;`
274
275			`(*width)--;`
276			`p++;`
277			`}`
278
279			`return p;`
280			`}`
281
282
283			`static char`
284			`next_char (st_parameter_dt dtp, char p, int w)`
285			`{`
286			`char c, *q;`
287
288			`if (*w == 0)`
289			`return '\0';`
290
291			`q = *p;`
292			`c = *q++;`
293			`*p = q;`
294
295			`(*w)--;`
296
297			`if (c != ' ')`
298			`return c;`
299			`if (dtp->u.p.blank_status != BLANK_UNSPECIFIED)`
300			`return ' '; /* return a blank to signal a null */`
301
302			`/* At this point, the rest of the field has to be trailing blanks */`
303
304			`while (*w > 0)`
305			`{`
306			`if (*q++ != ' ')`
307			`return '?';`
308			`(*w)--;`
309			`}`
310
311			`*p = q;`
312			`return '\0';`
313			`}`
314
315
316			`/* read_decimal()-- Read a decimal integer value. The values here are`
317			`* signed values. */`
318
319			`void`
320			`read_decimal (st_parameter_dt dtp, const fnode f, char *dest, int length)`
321			`{`
322			`GFC_UINTEGER_LARGEST value, maxv, maxv_10;`
323			`GFC_INTEGER_LARGEST v;`
324			`int w, negative;`
325			`char c, *p;`
326
327			`w = f->u.w;`
328			`p = read_block (dtp, &w);`
329			`if (p == NULL)`
330			`return;`
331
332			`p = eat_leading_spaces (&w, p);`
333			`if (w == 0)`
334			`{`
335			`set_integer (dest, (GFC_INTEGER_LARGEST) 0, length);`
336			`return;`
337			`}`
338
339			`maxv = max_value (length, 1);`
340			`maxv_10 = maxv / 10;`
341
342			`negative = 0;`
343			`value = 0;`
344
345			`switch (*p)`
346			`{`
347			`case '-':`
348			`negative = 1;`
349			`/* Fall through */`
350
351			`case '+':`
352			`p++;`
353			`if (--w == 0)`
354			`goto bad;`
355			`/* Fall through */`
356
357			`default:`
358			`break;`
359			`}`
360
361			`/* At this point we have a digit-string */`
362			`value = 0;`
363
364			`for (;;)`
365			`{`
366			`c = next_char (dtp, &p, &w);`
367			`if (c == '\0')`
368			`break;`
369
370			`if (c == ' ')`
371			`{`
372			`if (dtp->u.p.blank_status == BLANK_NULL) continue;`
373			`if (dtp->u.p.blank_status == BLANK_ZERO) c = '0';`
374			`}`
375
376			`if (c < '0' \|\| c > '9')`
377			`goto bad;`
378
379			`if (value > maxv_10)`
380			`goto overflow;`
381
382			`c -= '0';`
383			`value = 10 * value;`
384
385			`if (value > maxv - c)`
386			`goto overflow;`
387			`value += c;`
388			`}`
389
390			`v = value;`
391			`if (negative)`
392			`v = -v;`
393
394			`set_integer (dest, v, length);`
395			`return;`
396
397			`bad:`
398			`generate_error (&dtp->common, ERROR_READ_VALUE,`
399			`"Bad value during integer read");`
400			`return;`
401
402			`overflow:`
403			`generate_error (&dtp->common, ERROR_READ_OVERFLOW,`
404			`"Value overflowed during integer read");`
405			`return;`
406			`}`
407
408
409			`/* read_radix()-- This function reads values for non-decimal radixes.`
410			`* The difference here is that we treat the values here as unsigned`
411			`* values for the purposes of overflow. If minus sign is present and`
412			`* the top bit is set, the value will be incorrect. */`
413
414			`void`
415			`read_radix (st_parameter_dt dtp, const fnode f, char *dest, int length,`
416			`int radix)`
417			`{`
418			`GFC_UINTEGER_LARGEST value, maxv, maxv_r;`
419			`GFC_INTEGER_LARGEST v;`
420			`int w, negative;`
421			`char c, *p;`
422
423			`w = f->u.w;`
424			`p = read_block (dtp, &w);`
425			`if (p == NULL)`
426			`return;`
427
428			`p = eat_leading_spaces (&w, p);`
429			`if (w == 0)`
430			`{`
431			`set_integer (dest, (GFC_INTEGER_LARGEST) 0, length);`
432			`return;`
433			`}`
434
435			`maxv = max_value (length, 0);`
436			`maxv_r = maxv / radix;`
437
438			`negative = 0;`
439			`value = 0;`
440
441			`switch (*p)`
442			`{`
443			`case '-':`
444			`negative = 1;`
445			`/* Fall through */`
446
447			`case '+':`
448			`p++;`
449			`if (--w == 0)`
450			`goto bad;`
451			`/* Fall through */`
452
453			`default:`
454			`break;`
455			`}`
456
457			`/* At this point we have a digit-string */`
458			`value = 0;`
459
460			`for (;;)`
461			`{`
462			`c = next_char (dtp, &p, &w);`
463			`if (c == '\0')`
464			`break;`
465			`if (c == ' ')`
466			`{`
467			`if (dtp->u.p.blank_status == BLANK_NULL) continue;`
468			`if (dtp->u.p.blank_status == BLANK_ZERO) c = '0';`
469			`}`
470
471			`switch (radix)`
472			`{`
473			`case 2:`
474			`if (c < '0' \|\| c > '1')`
475			`goto bad;`
476			`break;`
477
478			`case 8:`
479			`if (c < '0' \|\| c > '7')`
480			`goto bad;`
481			`break;`
482
483			`case 16:`
484			`switch (c)`
485			`{`
486			`case '0':`
487			`case '1':`
488			`case '2':`
489			`case '3':`
490			`case '4':`
491			`case '5':`
492			`case '6':`
493			`case '7':`
494			`case '8':`
495			`case '9':`
496			`break;`
497
498			`case 'a':`
499			`case 'b':`
500			`case 'c':`
501			`case 'd':`
502			`case 'e':`
503			`case 'f':`
504			`c = c - 'a' + '9' + 1;`
505			`break;`
506
507			`case 'A':`
508			`case 'B':`
509			`case 'C':`
510			`case 'D':`
511			`case 'E':`
512			`case 'F':`
513			`c = c - 'A' + '9' + 1;`
514			`break;`
515
516			`default:`
517			`goto bad;`
518			`}`
519
520			`break;`
521			`}`
522
523			`if (value > maxv_r)`
524			`goto overflow;`
525
526			`c -= '0';`
527			`value = radix * value;`
528
529			`if (maxv - c < value)`
530			`goto overflow;`
531			`value += c;`
532			`}`
533
534			`v = value;`
535			`if (negative)`
536			`v = -v;`
537
538			`set_integer (dest, v, length);`
539			`return;`
540
541			`bad:`
542			`generate_error (&dtp->common, ERROR_READ_VALUE,`
543			`"Bad value during integer read");`
544			`return;`
545
546			`overflow:`
547			`generate_error (&dtp->common, ERROR_READ_OVERFLOW,`
548			`"Value overflowed during integer read");`
549			`return;`
550			`}`
551
552
553			`/* read_f()-- Read a floating point number with F-style editing, which`
554			`is what all of the other floating point descriptors behave as. The`
555			`tricky part is that optional spaces are allowed after an E or D,`
556			`and the implicit decimal point if a decimal point is not present in`
557			`the input. */`
558
559			`void`
560			`read_f (st_parameter_dt dtp, const fnode f, char *dest, int length)`
561			`{`
562			`int w, seen_dp, exponent;`
563			`int exponent_sign, val_sign;`
564			`int ndigits;`
565			`int edigits;`
566			`int i;`
567			`char p, buffer;`
568			`char *digits;`
569			`char scratch[SCRATCH_SIZE];`
570
571			`val_sign = 1;`
572			`seen_dp = 0;`
573			`w = f->u.w;`
574			`p = read_block (dtp, &w);`
575			`if (p == NULL)`
576			`return;`
577
578			`p = eat_leading_spaces (&w, p);`
579			`if (w == 0)`
580			`goto zero;`
581
582			`/* Optional sign */`
583
584			`if (p == '-' \|\| p == '+')`
585			`{`
586			`if (*p == '-')`
587			`val_sign = -1;`
588			`p++;`
589			`w--;`
590			`}`
591
592			`exponent_sign = 1;`
593			`p = eat_leading_spaces (&w, p);`
594			`if (w == 0)`
595			`goto zero;`
596
597			`/* A digit, a '.' or a exponent character ('e', 'E', 'd' or 'D')`
598			`is required at this point */`
599
600			`if (!isdigit (p) && p != '.' && p != 'd' && p != 'D'`
601			`&& p != 'e' && p != 'E')`
602			`goto bad_float;`
603
604			`/* Remember the position of the first digit. */`
605			`digits = p;`
606			`ndigits = 0;`
607
608			`/* Scan through the string to find the exponent. */`
609			`while (w > 0)`
610			`{`
611			`switch (*p)`
612			`{`
613			`case '.':`
614			`if (seen_dp)`
615			`goto bad_float;`
616			`seen_dp = 1;`
617			`/* Fall through */`
618
619			`case '0':`
620			`case '1':`
621			`case '2':`
622			`case '3':`
623			`case '4':`
624			`case '5':`
625			`case '6':`
626			`case '7':`
627			`case '8':`
628			`case '9':`
629			`case ' ':`
630			`ndigits++;`
631			`p++;`
632			`w--;`
633			`break;`
634
635			`case '-':`
636			`exponent_sign = -1;`
637			`/* Fall through */`
638
639			`case '+':`
640			`p++;`
641			`w--;`
642			`goto exp2;`
643
644			`case 'd':`
645			`case 'e':`
646			`case 'D':`
647			`case 'E':`
648			`p++;`
649			`w--;`
650			`goto exp1;`
651
652			`default:`
653			`goto bad_float;`
654			`}`
655			`}`
656
657			`/* No exponent has been seen, so we use the current scale factor */`
658			`exponent = -dtp->u.p.scale_factor;`
659			`goto done;`
660
661			`bad_float:`
662			`generate_error (&dtp->common, ERROR_READ_VALUE,`
663			`"Bad value during floating point read");`
664			`return;`
665
666			`/* The value read is zero */`
667			`zero:`
668			`switch (length)`
669			`{`
670			`case 4:`
671			`((GFC_REAL_4 ) dest) = 0;`
672			`break;`
673
674			`case 8:`
675			`((GFC_REAL_8 ) dest) = 0;`
676			`break;`
677
678			`#ifdef HAVE_GFC_REAL_10`
679			`case 10:`
680			`((GFC_REAL_10 ) dest) = 0;`
681			`break;`
682			`#endif`
683
684			`#ifdef HAVE_GFC_REAL_16`
685			`case 16:`
686			`((GFC_REAL_16 ) dest) = 0;`
687			`break;`
688			`#endif`
689
690			`default:`
691			`internal_error (&dtp->common, "Unsupported real kind during IO");`
692			`}`
693			`return;`
694
695			`/* At this point the start of an exponent has been found */`
696			`exp1:`
697			`while (w > 0 && *p == ' ')`
698			`{`
699			`w--;`
700			`p++;`
701			`}`
702
703			`switch (*p)`
704			`{`
705			`case '-':`
706			`exponent_sign = -1;`
707			`/* Fall through */`
708
709			`case '+':`
710			`p++;`
711			`w--;`
712			`break;`
713			`}`
714
715			`if (w == 0)`
716			`goto bad_float;`
717
718			`/* At this point a digit string is required. We calculate the value`
719			`of the exponent in order to take account of the scale factor and`
720			`the d parameter before explict conversion takes place. */`
721			`exp2:`
722			`if (!isdigit (*p))`
723			`goto bad_float;`
724
725			`exponent = *p - '0';`
726			`p++;`
727			`w--;`
728
729			`if (dtp->u.p.blank_status == BLANK_UNSPECIFIED) /* Normal processing of exponent */`
730			`{`
731			`while (w > 0 && isdigit (*p))`
732			`{`
733			`exponent = 10 * exponent + *p - '0';`
734			`p++;`
735			`w--;`
736			`}`
737
738			`/* Only allow trailing blanks */`
739
740			`while (w > 0)`
741			`{`
742			`if (*p != ' ')`
743			`goto bad_float;`
744			`p++;`
745			`w--;`
746			`}`
747			`}`
748			`else /* BZ or BN status is enabled */`
749			`{`
750			`while (w > 0)`
751			`{`
752			`if (*p == ' ')`
753			`{`
754			`if (dtp->u.p.blank_status == BLANK_ZERO) *p = '0';`
755			`if (dtp->u.p.blank_status == BLANK_NULL)`
756			`{`
757			`p++;`
758			`w--;`
759			`continue;`
760			`}`
761			`}`
762			`else if (!isdigit (*p))`
763			`goto bad_float;`
764
765			`exponent = 10 * exponent + *p - '0';`
766			`p++;`
767			`w--;`
768			`}`
769			`}`
770
771			`exponent = exponent * exponent_sign;`
772
773			`done:`
774			`/* Use the precision specified in the format if no decimal point has been`
775			`seen. */`
776			`if (!seen_dp)`
777			`exponent -= f->u.real.d;`
778
779			`if (exponent > 0)`
780			`{`
781			`edigits = 2;`
782			`i = exponent;`
783			`}`
784			`else`
785			`{`
786			`edigits = 3;`
787			`i = -exponent;`
788			`}`
789
790			`while (i >= 10)`
791			`{`
792			`i /= 10;`
793			`edigits++;`
794			`}`
795
796			`i = ndigits + edigits + 1;`
797			`if (val_sign < 0)`
798			`i++;`
799
800			`if (i < SCRATCH_SIZE)`
801			`buffer = scratch;`
802			`else`
803			`buffer = get_mem (i);`
804
805			`/* Reformat the string into a temporary buffer. As we're using atof it's`
806			`easiest to just leave the decimal point in place. */`
807			`p = buffer;`
808			`if (val_sign < 0)`
809			`*(p++) = '-';`
810			`for (; ndigits > 0; ndigits--)`
811			`{`
812			`if (*digits == ' ')`
813			`{`
814			`if (dtp->u.p.blank_status == BLANK_ZERO) *digits = '0';`
815			`if (dtp->u.p.blank_status == BLANK_NULL)`
816			`{`
817			`digits++;`
818			`continue;`
819			`}`
820			`}`
821			`p = digits;`
822			`p++;`
823			`digits++;`
824			`}`
825			`*(p++) = 'e';`
826			`sprintf (p, "%d", exponent);`
827
828			`/* Do the actual conversion. */`
829			`convert_real (dtp, dest, buffer, length);`
830
831			`if (buffer != scratch)`
832			`free_mem (buffer);`
833
834			`return;`
835			`}`
836
837
838			`/* read_x()-- Deal with the X/TR descriptor. We just read some data`
839			`* and never look at it. */`
840
841			`void`
842			`read_x (st_parameter_dt *dtp, int n)`
843			`{`
844			`if ((dtp->u.p.current_unit->flags.pad == PAD_NO \|\| is_internal_unit (dtp))`
845			`&& dtp->u.p.current_unit->bytes_left < n)`
846			`n = dtp->u.p.current_unit->bytes_left;`
847
848			`dtp->u.p.sf_read_comma = 0;`
849			`if (n > 0)`
850			`read_sf (dtp, &n, 1);`
851			`dtp->u.p.sf_read_comma = 1;`
852
853			`}`