+/* Implementation of the GETENV g77, and
+ GET_ENVIRONMENT_VARIABLE F2003, intrinsics.
+ Copyright (C) 2004 Free Software Foundation, Inc.
+ Contributed by Janne Blomqvist.
+
+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 Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with libgfor; see the file COPYING.LIB. If not,
+write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+#include "config.h"
+#include <sys/types.h>
+#include <stdlib.h>
+#include <string.h>
+#include "libgfortran.h"
+
+
+/* GETENV (NAME, VALUE), g77 intrinsic for retrieving the value of
+ an environment variable. The name of the variable is specified in
+ NAME, and the result is stored into VALUE. */
+
+void
+prefix(getenv) (char * name,
+ char * value,
+ gfc_strlen_type name_len,
+ gfc_strlen_type value_len)
+{
+
+ /* Make a null-terminated copy of the name string so that c library
+ functions work correctly. This is a C99 VLA, which ought to be
+ faster than malloc and free. */
+
+ char name_nt[name_len+1];
+
+ char *res = NULL;
+ int res_len;
+
+ if (name == NULL || value == NULL)
+ runtime_error ("Both arguments to getenv are mandatory.");
+
+ if (value_len < 1 || name_len < 1)
+ runtime_error ("Zero length string(s) passed to getenv.");
+ else
+ memset (value, ' ', value_len); /* Blank the string. */
+
+ memcpy (name_nt, name, name_len);
+ memset (&name_nt[name_len], '\0', 1);
+
+ res = getenv(name_nt);
+
+ /* If res is NULL, it means that the environment variable didn't
+ exist, so just return. */
+ if (res == NULL)
+ return;
+
+ res_len = strlen(res);
+ if (value_len < res_len)
+ memcpy (value, res, value_len);
+ else
+ memcpy (value, res, res_len);
+}
+
+
+/* GET_ENVIRONMENT_VARIABLE (name, [value, length, status, trim_name])
+ is a F2003 intrinsic for getting an environment variable. Note that as
+ Un*x doesn't consider trailing blanks in environment variables to be
+ significant, the trim_name argument has no meaning. */
+
+/* Status codes specifyed by the standard. */
+#define GFC_SUCCESS 0
+#define GFC_VALUE_TOO_SHORT -1
+#define GFC_NAME_DOES_NOT_EXIST 1
+
+/* This is also specified by the standard and means that the
+ processor doesn't support environment variables. At the moment,
+ gfortran doesn't use it. */
+#define GFC_NOT_SUPPORTED 2
+
+/* Processor-specific failure code. */
+#define GFC_FAILURE 42
+
+void
+prefix(get_environment_variable_i4)
+ (
+ char *name,
+ char *value,
+ GFC_INTEGER_4 *length,
+ GFC_INTEGER_4 *status,
+ GFC_LOGICAL_4 *trim_name,
+ gfc_strlen_type name_len,
+ gfc_strlen_type value_len)
+{
+ int stat = GFC_SUCCESS, res_len = 0;
+ char name_nt[name_len+1], *res;
+
+ if (name == NULL)
+ runtime_error ("Name is required for get_environment_variable.");
+
+ if (value == NULL && length == NULL && status == NULL && trim_name == NULL)
+ return;
+
+ if (name_len < 1)
+ runtime_error ("Zero-length string passed as name to "
+ "get_environment_variable.");
+
+ if (value != NULL)
+ {
+ if (value_len < 1)
+ runtime_error ("Zero-length string passed as value to "
+ "get_environment_variable.");
+ else
+ memset (value, ' ', value_len); /* Blank the string. */
+ }
+
+ memcpy (name_nt, name, name_len);
+ memset (&name_nt[name_len], '\0', 1);
+
+ res = getenv(name_nt);
+
+ if (res == NULL)
+ stat = GFC_NAME_DOES_NOT_EXIST;
+ else
+ {
+ res_len = strlen(res);
+ if (value != NULL)
+ {
+ if (value_len < res_len)
+ {
+ memcpy (value, res, value_len);
+ stat = GFC_VALUE_TOO_SHORT;
+ }
+ else
+ memcpy (value, res, res_len);
+ }
+ }
+
+ if (status != NULL)
+ *status = stat;
+
+ if (length != NULL)
+ *length = res_len;
+}
+
+
+/* INTEGER*8 wrapper for get_environment_variable. */
+
+void
+prefix(get_environment_variable_i8)
+ (
+ char *name,
+ char *value,
+ GFC_INTEGER_8 *length,
+ GFC_INTEGER_8 *status,
+ GFC_LOGICAL_8 *trim_name,
+ gfc_strlen_type name_len,
+ gfc_strlen_type value_len)
+{
+ GFC_INTEGER_4 length4, status4;
+ GFC_LOGICAL_4 trim_name4;
+
+ prefix (get_environment_variable_i4) (name, value, &length4, &status4,
+ &trim_name4, name_len, value_len);
+
+ if (length)
+ *length = length4;
+
+ if (status)
+ *status = status4;
+}
OSDN Git Service
