gcc/libgfortran/runtime/environ.c

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/* Copyright (C) 2002-2003 Free Software Foundation, Inc.
Contributed by Andy Vaught
This file is part of the GNU Fortran 95 runtime library (libgfor).
Libgfor 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.
Libgfor 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 libgfor; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "libgfortran.h"
#include "../io/io.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;
extern char **environ;
typedef struct variable
{
const char *name;
int value, *var;
void (*init) (struct variable *);
void (*show) (struct variable *);
const char *desc;
int bad;
}
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';
st_printf (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))
{
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");
}
/* init_mem()-- Initialize environment variables that have to do with
* how memory from an ALLOCATE statement is filled. A single flag
* enables filling and a second variable gives the value that is used
* to initialize the memory. */
static void
init_mem (variable * v)
{
int offset, n;
char *p;
p = getenv (v->name);
options.allocate_init_flag = 0; /* The default */
if (p == NULL)
return;
if (strcasecmp (p, "NONE") == 0)
return;
/* IEEE-754 Quiet Not-a-Number that will work for single and double
* precision. Look for the 'f95' mantissa in debug dumps. */
if (strcasecmp (p, "NaN") == 0)
{
options.allocate_init_flag = 1;
options.allocate_init_value = 0xfff80f95;
return;
}
/* Interpret the string as a hexadecimal constant */
n = 0;
while (*p)
{
if (!isxdigit (*p))
{
v->bad = 1;
return;
}
offset = '0';
if (islower (*p))
offset = 'a';
if (isupper (*p))
offset = 'A';
n = (n << 4) | (*p++ - offset);
}
options.allocate_init_flag = 1;
options.allocate_init_value = n;
}
static void
show_mem (variable * v)
{
char *p;
p = getenv (v->name);
st_printf ("%s ", var_source (v));
if (options.allocate_init_flag)
st_printf ("0x%x", options.allocate_init_value);
st_printf ("\n");
}
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)
{
}
static void
show_string (variable * v)
{
const char *p;
p = getenv (v->name);
if (p == NULL)
p = "";
st_printf ("%s \"%s\"\n", var_source (v), p);
}
/* Structure for associating names and values. */
typedef struct
{
const char *name;
int value;
}
choice;
enum
{ FP_ROUND_NEAREST, FP_ROUND_UP, FP_ROUND_DOWN, FP_ROUND_ZERO };
static choice rounding[] = {
{"NEAREST", FP_ROUND_NEAREST},
{"UP", FP_ROUND_UP},
{"DOWN", FP_ROUND_DOWN},
{"ZERO", FP_ROUND_ZERO},
{NULL}
}, precision[] =
{
{
"24", 1}
,
{
"53", 2}
,
{
"64", 0}
,
{
NULL}
}
, signal_choices[] =
{
{
"IGNORE", 1}
,
{
"ABORT", 0}
,
{
NULL}
};
static void
init_choice (variable * v, choice * c)
{
char *p;
p = getenv (v->name);
if (p == NULL)
goto set_default;
for (; c->name; c++)
if (strcasecmp (c->name, p) == 0)
break;
if (c->name == NULL)
{
v->bad = 1;
goto set_default;
}
*v->var = c->value;
return;
set_default:
*v->var = v->value;
}
static void
show_choice (variable * v, choice * c)
{
st_printf ("%s ", var_source (v));
for (; c->name; c++)
if (c->value == *v->var)
break;
if (c->name)
st_printf ("%s\n", c->name);
else
st_printf ("(Unknown)\n");
}
static void
init_round (variable * v)
{
init_choice (v, rounding);
}
static void
show_round (variable * v)
{
show_choice (v, rounding);
}
static void
init_precision (variable * v)
{
init_choice (v, precision);
}
static void
show_precision (variable * v)
{
show_choice (v, precision);
}
static void
init_signal (variable * v)
{
init_choice (v, signal_choices);
}
static void
show_signal (variable * v)
{
show_choice (v, signal_choices);
}
static variable variable_table[] = {
{"GFORTRAN_STDIN_UNIT", 5, &options.stdin_unit, init_integer, show_integer,
"Unit number that will be preconnected to standard input\n"
"(No preconnection if negative)"},
{"GFORTRAN_STDOUT_UNIT", 6, &options.stdout_unit, init_integer,
show_integer,
"Unit number that will be preconnected to standard output\n"
"(No preconnection if negative)"},
{"GFORTRAN_USE_STDERR", 1, &options.use_stderr, init_boolean,
show_boolean,
"Sends library output to standard error instead of standard output."},
{"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."},
{"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."},
{"GFORTRAN_SHOW_LOCUS", 1, &options.locus, init_boolean, show_boolean,
"If TRUE, print filename and line number where runtime errors happen."},
/* GFORTRAN_NAME_xx (where xx is a unit number) gives the names of files
* preconnected to those units. */
/* GFORTRAN_UNBUFFERED_xx (where xx is a unit number) gives a boolean that is used
* to turn off buffering for that unit. */
{"GFORTRAN_OPTIONAL_PLUS", 0, &options.optional_plus, init_boolean, show_boolean,
"Print optional plus signs in numbers where permitted. Default FALSE."},
{"GFORTRAN_DEFAULT_RECL", DEFAULT_RECL, &options.default_recl,
init_integer, show_integer,
"Default maximum record length for sequential files. Most useful for\n"
"adjusting line length of preconnected units. Default "
stringize (DEFAULT_RECL)},
{"GFORTRAN_LIST_SEPARATOR", 0, NULL, init_sep, show_sep,
"Separatator to use when writing list output. May contain any number of "
"spaces\nand at most one comma. Default is a single space."},
/* Memory related controls */
{"GFORTRAN_MEM_INIT", 0, NULL, init_mem, show_mem,
"How to initialize allocated memory. Default value is NONE for no "
"initialization\n(faster), NAN for a Not-a-Number with the mantissa "
"0x40f95 or a custom\nhexadecimal value"},
{"GFORTRAN_MEM_CHECK", 0, &options.mem_check, init_boolean, show_boolean,
"Whether memory still allocated will be reported when the program ends."},
/* Signal handling (Unix). */
{"GFORTRAN_SIGHUP", 0, &options.sighup, init_signal, show_signal,
"Whether the program will IGNORE or ABORT on SIGHUP."},
{"GFORTRAN_SIGINT", 0, &options.sigint, init_signal, show_signal,
"Whether the program will IGNORE or ABORT on SIGINT."},
/* Floating point control */
{"GFORTRAN_FPU_ROUND", 0, &options.fpu_round, init_round, show_round,
"Set floating point rounding. Values are NEAREST, UP, DOWN, ZERO."},
{"GFORTRAN_FPU_PRECISION", 0, &options.fpu_precision, init_precision,
show_precision,
"Precision of intermediate results. Values are 24, 53 and 64."},
{"GFORTRAN_FPU_INVALID", 1, &options.fpu_invalid, init_boolean,
show_boolean,
"Raise a floating point exception on invalid FP operation."},
{"GFORTRAN_FPU_DENORMAL", 1, &options.fpu_denormal, init_boolean,
show_boolean,
"Raise a floating point exception when denormal numbers are encountered."},
{"GFORTRAN_FPU_ZERO", 0, &options.fpu_zerodiv, init_boolean, show_boolean,
"Raise a floating point exception when dividing by zero."},
{"GFORTRAN_FPU_OVERFLOW", 0, &options.fpu_overflow, init_boolean,
show_boolean,
"Raise a floating point exception on overflow."},
{"GFORTRAN_FPU_UNDERFLOW", 0, &options.fpu_underflow, init_boolean,
show_boolean,
"Raise a floating point exception on underflow."},
{"GFORTRAN_FPU_PRECISION", 0, &options.fpu_precision_loss, init_boolean,
show_boolean,
"Raise a floating point exception on precision loss."},
{NULL}
};
/* 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);
}
/* check_buffered()-- Given an unit number n, determine if an override
* for the stream exists. Returns zero for unbuffered, one for
* buffered or two for not set. */
int
check_buffered (int n)
{
char name[40];
variable v;
int rv;
if (options.all_unbuffered)
return 0;
strcpy (name, "GFORTRAN_UNBUFFERED_");
strcat (name, itoa (n));
v.name = name;
v.value = 2;
v.var = &rv;
init_boolean (&v);
return rv;
}
/* pattern_scan()-- Given an environment string, check that the name
* has the same name as the pattern followed by an integer. On a
* match, a pointer to the value is returned and the integer pointed
* to by n is updated. Returns NULL on no match. */
static char *
pattern_scan (char *env, const char *pattern, int *n)
{
char *p;
size_t len;
len = strlen (pattern);
if (strncasecmp (env, pattern, len) != 0)
return NULL;
p = env + len;
if (!isdigit (*p))
return NULL;
while (isdigit (*p))
p++;
if (*p != '=')
return NULL;
*p = '\0';
*n = atoi (env + len);
*p++ = '=';
return p;
}
void
show_variables (void)
{
char *p, **e;
variable *v;
int n;
/* TODO: print version number. */
st_printf ("GNU Fortran 95 runtime library version "
"UNKNOWN" "\n\n");
st_printf ("Environment variables:\n");
st_printf ("----------------------\n");
for (v = variable_table; v->name; v++)
{
n = st_printf ("%s", v->name);
print_spaces (25 - n);
if (v->show == show_integer)
st_printf ("Integer ");
else if (v->show == show_boolean)
st_printf ("Boolean ");
else
st_printf ("String ");
v->show (v);
st_printf ("%s\n\n", v->desc);
}
st_printf ("\nDefault unit names (GFORTRAN_NAME_x):\n");
for (e = environ; *e; e++)
{
p = pattern_scan (*e, "GFORTRAN_NAME_", &n);
if (p == NULL)
continue;
st_printf ("GFORTRAN_NAME_%d %s\n", n, p);
}
st_printf ("\nUnit buffering overrides (GFORTRAN_UNBUFFERED_x):\n");
for (e = environ; *e; e++)
{
p = pattern_scan (*e, "GFORTRAN_UNBUFFERED_", &n);
if (p == NULL)
continue;
st_printf ("GFORTRAN_UNBUFFERED_%d = %s\n", n, p);
}
/* System error codes */
st_printf ("\nRuntime error codes:");
st_printf ("\n--------------------\n");
for (n = ERROR_FIRST + 1; n < ERROR_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));
st_printf ("\nCommand line arguments:\n");
st_printf (" --help Print this list\n");
/* st_printf(" --resume <dropfile> Resume program execution from dropfile\n"); */
sys_exit (0);
}