Merge tree-ssa-20020619-branch into mainline.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@81764 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 678 insertions, 0 deletions

diff --git a/libgfortran/runtime/environ.c b/libgfortran/runtime/environ.c
new file mode 100644
index 00000000000..71419616920
--- /dev/null
+++ b/libgfortran/runtime/environ.c
@@ -0,0 +1,678 @@
+/* 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);
+}