180 lines
5 KiB
C
180 lines
5 KiB
C
/* Implementation of the GETENV g77, and
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GET_ENVIRONMENT_VARIABLE F2003, intrinsics.
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Copyright (C) 2004-2022 Free Software Foundation, Inc.
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Contributed by Janne Blomqvist.
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This file is part of the GNU Fortran 95 runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#include <string.h>
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/* GETENV (NAME, VALUE), g77 intrinsic for retrieving the value of
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an environment variable. The name of the variable is specified in
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NAME, and the result is stored into VALUE. */
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void PREFIX(getenv) (char *, char *, gfc_charlen_type, gfc_charlen_type);
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export_proto_np(PREFIX(getenv));
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void
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PREFIX(getenv) (char * name, char * value, gfc_charlen_type name_len,
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gfc_charlen_type value_len)
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{
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char *name_nt;
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char *res = NULL;
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if (name == NULL || value == NULL)
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runtime_error ("Both arguments to getenv are mandatory.");
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if (value_len < 1 || name_len < 1)
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runtime_error ("Zero length string(s) passed to getenv.");
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else
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memset (value, ' ', value_len); /* Blank the string. */
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/* Make a null terminated copy of the string. */
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name_nt = fc_strdup (name, name_len);
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res = getenv(name_nt);
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free (name_nt);
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/* If res is NULL, it means that the environment variable didn't
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exist, so just return. */
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if (res == NULL)
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return;
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cf_strcpy (value, value_len, res);
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}
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/* GET_ENVIRONMENT_VARIABLE (name, [value, length, status, trim_name])
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is a F2003 intrinsic for getting an environment variable. */
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/* Status codes specifyed by the standard. */
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#define GFC_SUCCESS 0
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#define GFC_VALUE_TOO_SHORT -1
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#define GFC_NAME_DOES_NOT_EXIST 1
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/* This is also specified by the standard and means that the
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processor doesn't support environment variables. At the moment,
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gfortran doesn't use it. */
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#define GFC_NOT_SUPPORTED 2
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/* Processor-specific failure code. */
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#define GFC_FAILURE 42
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extern void get_environment_variable_i4 (char *, char *, GFC_INTEGER_4 *,
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GFC_INTEGER_4 *, GFC_LOGICAL_4 *,
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gfc_charlen_type, gfc_charlen_type);
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iexport_proto(get_environment_variable_i4);
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void
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get_environment_variable_i4 (char *name, char *value, GFC_INTEGER_4 *length,
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GFC_INTEGER_4 *status, GFC_LOGICAL_4 *trim_name,
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gfc_charlen_type name_len,
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gfc_charlen_type value_len)
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{
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int stat = GFC_SUCCESS;
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gfc_charlen_type res_len = 0;
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char *name_nt;
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char *res;
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if (name == NULL)
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runtime_error ("Name is required for get_environment_variable.");
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if (value == NULL && length == NULL && status == NULL && trim_name == NULL)
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return;
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if (name_len < 1)
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runtime_error ("Zero-length string passed as name to "
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"get_environment_variable.");
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if (value != NULL)
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{
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if (value_len > 0)
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memset (value, ' ', value_len); /* Blank the string. */
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}
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if ((!trim_name) || *trim_name)
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name_nt = fc_strdup (name, name_len);
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else
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name_nt = fc_strdup_notrim (name, name_len);
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res = getenv(name_nt);
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free (name_nt);
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if (res == NULL)
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stat = GFC_NAME_DOES_NOT_EXIST;
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else
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{
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res_len = strlen(res);
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if (value != NULL)
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{
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if (value_len < res_len)
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{
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memcpy (value, res, value_len);
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stat = GFC_VALUE_TOO_SHORT;
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}
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else if (res_len > 0)
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memcpy (value, res, res_len);
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}
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}
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if (status != NULL)
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*status = stat;
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if (length != NULL)
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*length = res_len;
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}
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iexport(get_environment_variable_i4);
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/* INTEGER*8 wrapper for get_environment_variable. */
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extern void get_environment_variable_i8 (char *, char *, GFC_INTEGER_8 *,
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GFC_INTEGER_8 *, GFC_LOGICAL_8 *,
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gfc_charlen_type, gfc_charlen_type);
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export_proto(get_environment_variable_i8);
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void
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get_environment_variable_i8 (char *name, char *value, GFC_INTEGER_8 *length,
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GFC_INTEGER_8 *status, GFC_LOGICAL_8 *trim_name,
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gfc_charlen_type name_len,
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gfc_charlen_type value_len)
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{
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GFC_INTEGER_4 length4, status4;
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GFC_LOGICAL_4 trim_name4;
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if (trim_name)
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trim_name4 = *trim_name;
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get_environment_variable_i4 (name, value, &length4, &status4,
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trim_name ? &trim_name4 : NULL,
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name_len, value_len);
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if (length)
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*length = length4;
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if (status)
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*status = status4;
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}
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