Subversion Repositories openrisc

/* Copyright (C) 2002, 2003, 2005, 2007, 2009 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 3, or (at your option)

any later version.

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.

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 "libgfortran.h"

#include <string.h>

#include <stdlib.h>

#include <ctype.h>

/* Environment scanner.  Examine the environment for controlling minor

 * aspects of the program's execution.  Our philosophy here that the

 * environment should not prevent the program from running, so an

 * environment variable with a messed-up value will be interpreted in

 * the default way.

 *

 * Most of the environment is checked early in the startup sequence,

 * but other variables are checked during execution of the user's

 * program. */

options_t options;

typedef struct variable

{

  const char *name;

  int value, *var;

  void (*init) (struct variable *);

  void (*show) (struct variable *);

  const char *desc;

  int bad;

}

variable;

static void init_unformatted (variable *);

/* print_spaces()-- Print a particular number of spaces.  */

static void

print_spaces (int n)

{

  char buffer[80];

  int i;

  if (n <= 0)

    return;

  for (i = 0; i < n; i++)

    buffer[i] = ' ';

  buffer[i] = '\0';

  estr_write (buffer);

}

/* var_source()-- Return a string that describes where the value of a

 * variable comes from */

static const char *

var_source (variable * v)

{

  if (getenv (v->name) == NULL)

    return "Default";

  if (v->bad)

    return "Bad    ";

  return "Set    ";

}

/* init_integer()-- Initialize an integer environment variable.  */

static void

init_integer (variable * v)

{

  char *p, *q;

  p = getenv (v->name);

  if (p == NULL)

    goto set_default;

  for (q = p; *q; q++)

    if (!isdigit (*q) && (p != q || *q != '-'))

      {

        v->bad = 1;

        goto set_default;

      }

  *v->var = atoi (p);

  return;

 set_default:

  *v->var = v->value;

  return;

}

/* init_unsigned_integer()-- Initialize an integer environment variable

   which has to be positive.  */

static void

init_unsigned_integer (variable * v)

{

  char *p, *q;

  p = getenv (v->name);

  if (p == NULL)

    goto set_default;

  for (q = p; *q; q++)

    if (!isdigit (*q))

      {

        v->bad = 1;

        goto set_default;

      }

  *v->var = atoi (p);

  return;

 set_default:

  *v->var = v->value;

  return;

}

/* show_integer()-- Show an integer environment variable */

static void

show_integer (variable * v)

{

  st_printf ("%s  %d\n", var_source (v), *v->var);

}

/* init_boolean()-- Initialize a boolean environment variable.  We

 * only look at the first letter of the variable. */

static void

init_boolean (variable * v)

{

  char *p;

  p = getenv (v->name);

  if (p == NULL)

    goto set_default;

  if (*p == '1' || *p == 'Y' || *p == 'y')

    {

      *v->var = 1;

      return;

    }

  if (*p == '0' || *p == 'N' || *p == 'n')

    {

      *v->var = 0;

      return;

    }

  v->bad = 1;

set_default:

  *v->var = v->value;

  return;

}

/* show_boolean()-- Show a boolean environment variable */

static void

show_boolean (variable * v)

{

  st_printf ("%s  %s\n", var_source (v), *v->var ? "Yes" : "No");

}

static void

init_sep (variable * v)

{

  int seen_comma;

  char *p;

  p = getenv (v->name);

  if (p == NULL)

    goto set_default;

  v->bad = 1;

  options.separator = p;

  options.separator_len = strlen (p);

  /* Make sure the separator is valid */

  if (options.separator_len == 0)

    goto set_default;

  seen_comma = 0;

  while (*p)

    {

      if (*p == ',')

        {

          if (seen_comma)

            goto set_default;

          seen_comma = 1;

          p++;

          continue;

        }

      if (*p++ != ' ')

        goto set_default;

    }

  v->bad = 0;

  return;

set_default:

  options.separator = " ";

  options.separator_len = 1;

}

static void

show_sep (variable * v)

{

  st_printf ("%s  \"%s\"\n", var_source (v), options.separator);

}

static void

init_string (variable * v __attribute__ ((unused)))

{

}

static void

show_string (variable * v)

{

  const char *p;

  p = getenv (v->name);

  if (p == NULL)

    p = "";

  estr_write (var_source (v));

  estr_write ("  \"");

  estr_write (p);

  estr_write ("\"\n");

}

static variable variable_table[] = {

  {"GFORTRAN_STDIN_UNIT", GFC_STDIN_UNIT_NUMBER, &options.stdin_unit,

   init_integer, show_integer,

   "Unit number that will be preconnected to standard input\n"

   "(No preconnection if negative)", 0},

  {"GFORTRAN_STDOUT_UNIT", GFC_STDOUT_UNIT_NUMBER, &options.stdout_unit,

   init_integer, show_integer,

   "Unit number that will be preconnected to standard output\n"

   "(No preconnection if negative)", 0},

  {"GFORTRAN_STDERR_UNIT", GFC_STDERR_UNIT_NUMBER, &options.stderr_unit,

   init_integer, show_integer,

   "Unit number that will be preconnected to standard error\n"

   "(No preconnection if negative)", 0},

  {"GFORTRAN_TMPDIR", 0, NULL, init_string, show_string,

   "Directory for scratch files.  Overrides the TMP environment variable\n"

   "If TMP is not set " DEFAULT_TEMPDIR " is used.", 0},

  {"GFORTRAN_UNBUFFERED_ALL", 0, &options.all_unbuffered, init_boolean,

   show_boolean,

   "If TRUE, all output is unbuffered.  This will slow down large writes "

   "but can be\nuseful for forcing data to be displayed immediately.", 0},

  {"GFORTRAN_UNBUFFERED_PRECONNECTED", 0, &options.unbuffered_preconnected,

   init_boolean, show_boolean,

   "If TRUE, output to preconnected units is unbuffered.", 0},

  {"GFORTRAN_SHOW_LOCUS", 1, &options.locus, init_boolean, show_boolean,

   "If TRUE, print filename and line number where runtime errors happen.", 0},

  {"GFORTRAN_OPTIONAL_PLUS", 0, &options.optional_plus, init_boolean, show_boolean,

   "Print optional plus signs in numbers where permitted.  Default FALSE.", 0},

  {"GFORTRAN_DEFAULT_RECL", DEFAULT_RECL, &options.default_recl,

   init_unsigned_integer, show_integer,

   "Default maximum record length for sequential files.  Most useful for\n"

   "adjusting line length of preconnected units.  Default "

   stringize (DEFAULT_RECL), 0},

  {"GFORTRAN_LIST_SEPARATOR", 0, NULL, init_sep, show_sep,

   "Separator to use when writing list output.  May contain any number of "

   "spaces\nand at most one comma.  Default is a single space.", 0},

  /* GFORTRAN_CONVERT_UNIT - Set the default data conversion for

   unformatted I/O.  */

  {"GFORTRAN_CONVERT_UNIT", 0, 0, init_unformatted, show_string,

   "Set format for unformatted files", 0},

  {"GFORTRAN_ERROR_BACKTRACE", -1, &options.backtrace,

    init_boolean, show_boolean,

    "Print out a backtrace (if possible) on runtime error", -1},

  {NULL, 0, NULL, NULL, NULL, NULL, 0}

};

/* init_variables()-- Initialize most runtime variables from

 * environment variables. */

void

init_variables (void)

{

  variable *v;

  for (v = variable_table; v->name; v++)

    v->init (v);

}

void

show_variables (void)

{

  variable *v;

  int n;

  /* TODO: print version number.  */

  estr_write ("GNU Fortran runtime library version "

             "UNKNOWN" "\n\n");

  estr_write ("Environment variables:\n");

  estr_write ("----------------------\n");

  for (v = variable_table; v->name; v++)

    {

      n = estr_write (v->name);

      print_spaces (25 - n);

      if (v->show == show_integer)

        estr_write ("Integer ");

      else if (v->show == show_boolean)

        estr_write ("Boolean ");

      else

        estr_write ("String  ");

      v->show (v);

      estr_write (v->desc);

      estr_write ("\n\n");

    }

  /* System error codes */

  estr_write ("\nRuntime error codes:");

  estr_write ("\n--------------------\n");

  for (n = LIBERROR_FIRST + 1; n < LIBERROR_LAST; n++)

    if (n < 0 || n > 9)

      st_printf ("%d  %s\n", n, translate_error (n));

    else

      st_printf (" %d  %s\n", n, translate_error (n));

  estr_write ("\nCommand line arguments:\n");

  estr_write ("  --help               Print this list\n");

  exit (0);

}

/* This is the handling of the GFORTRAN_CONVERT_UNITS environment variable.

   It is called from environ.c to parse this variable, and from

   open.c to determine if the user specified a default for an

   unformatted file.

   The syntax of the environment variable is, in bison grammar:

   GFORTRAN_CONVERT_UNITS: mode | mode ';' exception ;

   mode: 'native' | 'swap' | 'big_endian' | 'little_endian' ;

   exception: mode ':' unit_list | unit_list ;

   unit_list: unit_spec | unit_list unit_spec ;

   unit_spec: INTEGER | INTEGER '-' INTEGER ;

*/

/* Defines for the tokens.  Other valid tokens are ',', ':', '-'.  */

#define NATIVE   257

#define SWAP     258

#define BIG      259

#define LITTLE   260

/* Some space for additional tokens later.  */

#define INTEGER  273

#define END      (-1)

#define ILLEGAL  (-2)

typedef struct

{

  int unit;

  unit_convert conv;

} exception_t;

static char *p;            /* Main character pointer for parsing.  */

static char *lastpos;      /* Auxiliary pointer, for backing up.  */

static int unit_num;       /* The last unit number read.  */

static int unit_count;     /* The number of units found. */

static int do_count;       /* Parsing is done twice - first to count the number

                              of units, then to fill in the table.  This

                              variable controls what to do.  */

static exception_t *elist; /* The list of exceptions to the default. This is

                              sorted according to unit number.  */

static int n_elist;        /* Number of exceptions to the default.  */

static unit_convert endian; /* Current endianness.  */

static unit_convert def; /* Default as specified (if any).  */

/* Search for a unit number, using a binary search.  The

   first argument is the unit number to search for.  The second argument

   is a pointer to an index.

   If the unit number is found, the function returns 1, and the index

   is that of the element.

   If the unit number is not found, the function returns 0, and the

   index is the one where the element would be inserted.  */

static int

search_unit (int unit, int *ip)

{

  int low, high, mid;

  low = -1;

  high = n_elist;

  while (high - low > 1)

    {

      mid = (low + high) / 2;

      if (unit <= elist[mid].unit)

        high = mid;

      else

        low = mid;

    }

  *ip = high;

  if (elist[high].unit == unit)

    return 1;

  else

    return 0;

}

/* This matches a keyword.  If it is found, return the token supplied,

   otherwise return ILLEGAL.  */

static int

match_word (const char *word, int tok)

{

  int res;

  if (strncasecmp (p, word, strlen (word)) == 0)

    {

      p += strlen (word);

      res = tok;

    }

  else

    res = ILLEGAL;

  return res;

}

/* Match an integer and store its value in unit_num.  This only works

   if p actually points to the start of an integer.  The caller has

   to ensure this.  */

static int

match_integer (void)

{

  unit_num = 0;

  while (isdigit (*p))

    unit_num = unit_num * 10 + (*p++ - '0');

  return INTEGER;

}

/* This reads the next token from the GFORTRAN_CONVERT_UNITS variable.

   Returned values are the different tokens.  */

static int

next_token (void)

{

  int result;

  lastpos = p;

  switch (*p)

    {

    case '\0':

      result = END;

      break;

    case ':':

    case ',':

    case '-':

    case ';':

      result = *p;

      p++;

      break;

    case 'b':

    case 'B':

      result = match_word ("big_endian", BIG);

      break;

    case 'l':

    case 'L':

      result = match_word ("little_endian", LITTLE);

      break;

    case 'n':

    case 'N':

      result = match_word ("native", NATIVE);

      break;

    case 's':

    case 'S':

      result = match_word ("swap", SWAP);

      break;

    case '1': case '2': case '3': case '4': case '5':

    case '6': case '7': case '8': case '9':

      result = match_integer ();

      break;

    default:

      result = ILLEGAL;

      break;

    }

  return result;

}

/* Back up the last token by setting back the character pointer.  */

static void

push_token (void)

{

  p = lastpos;

}

/* This is called when a unit is identified.  If do_count is nonzero,

   increment the number of units by one.  If do_count is zero,

   put the unit into the table.  */

static void

mark_single (int unit)

{

  int i,j;

  if (do_count)

    {

      unit_count++;

      return;

    }

  if (search_unit (unit, &i))

    {

      elist[unit].conv = endian;

    }

  else

    {

      for (j=n_elist; j>=i; j--)

        elist[j+1] = elist[j];

      n_elist += 1;

      elist[i].unit = unit;

      elist[i].conv = endian;

    }

}

/* This is called when a unit range is identified.  If do_count is

   nonzero, increase the number of units.  If do_count is zero,

   put the unit into the table.  */

static void

mark_range (int unit1, int unit2)

{

  int i;

  if (do_count)

    unit_count += abs (unit2 - unit1) + 1;

  else

    {

      if (unit2 < unit1)

        for (i=unit2; i<=unit1; i++)

          mark_single (i);

      else

        for (i=unit1; i<=unit2; i++)

          mark_single (i);

    }

}

/* Parse the GFORTRAN_CONVERT_UNITS variable.  This is called

   twice, once to count the units and once to actually mark them in

   the table.  When counting, we don't check for double occurrences

   of units.  */

static int

do_parse (void)

{

  int tok;

  int unit1;

  int continue_ulist;

  char *start;

  unit_count = 0;

  start = p;

  /* Parse the string.  First, let's look for a default.  */

  tok = next_token ();

  switch (tok)

    {

    case NATIVE:

      endian = GFC_CONVERT_NATIVE;

      break;

    case SWAP:

      endian = GFC_CONVERT_SWAP;

      break;

    case BIG:

      endian = GFC_CONVERT_BIG;

      break;

    case LITTLE:

      endian = GFC_CONVERT_LITTLE;

      break;

    case INTEGER:

      /* A leading digit means that we are looking at an exception.

         Reset the position to the beginning, and continue processing

         at the exception list.  */

      p = start;

      goto exceptions;

      break;

    case END:

      goto end;

      break;

    default:

      goto error;

      break;

    }

  tok = next_token ();

  switch (tok)

    {

    case ';':

      def = endian;

      break;

    case ':':

      /* This isn't a default after all.  Reset the position to the

         beginning, and continue processing at the exception list.  */

      p = start;

      goto exceptions;

      break;

    case END:

      def = endian;

      goto end;

      break;

    default:

      goto error;

      break;

    }

 exceptions:

  /* Loop over all exceptions.  */

  while(1)

    {

      tok = next_token ();

      switch (tok)

        {

        case NATIVE:

          if (next_token () != ':')

            goto error;

          endian = GFC_CONVERT_NATIVE;

          break;

        case SWAP:

          if (next_token () != ':')

            goto error;

          endian = GFC_CONVERT_SWAP;

          break;

        case LITTLE:

          if (next_token () != ':')

            goto error;

          endian = GFC_CONVERT_LITTLE;

          break;