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/* Implementation of the GETENV g77, and
GET_ENVIRONMENT_VARIABLE F2003, intrinsics.
Copyright (C) 2004-2022 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 General Public
License as published by the Free Software Foundation; either
version 3 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 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>
/* 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 *, char *, gfc_charlen_type, gfc_charlen_type);
export_proto_np(PREFIX(getenv));
void
PREFIX(getenv) (char * name, char * value, gfc_charlen_type name_len,
gfc_charlen_type value_len)
{
char *name_nt;
char *res = NULL;
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. */
/* Make a null terminated copy of the string. */
name_nt = fc_strdup (name, name_len);
res = getenv(name_nt);
free (name_nt);
/* If res is NULL, it means that the environment variable didn't
exist, so just return. */
if (res == NULL)
return;
cf_strcpy (value, value_len, res);
}
/* GET_ENVIRONMENT_VARIABLE (name, [value, length, status, trim_name])
is a F2003 intrinsic for getting an environment variable. */
/* 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
extern void get_environment_variable_i4 (char *, char *, GFC_INTEGER_4 *,
GFC_INTEGER_4 *, GFC_LOGICAL_4 *,
gfc_charlen_type, gfc_charlen_type);
iexport_proto(get_environment_variable_i4);
void
get_environment_variable_i4 (char *name, char *value, GFC_INTEGER_4 *length,
GFC_INTEGER_4 *status, GFC_LOGICAL_4 *trim_name,
gfc_charlen_type name_len,
gfc_charlen_type value_len)
{
int stat = GFC_SUCCESS;
gfc_charlen_type res_len = 0;
char *name_nt;
char *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 > 0)
memset (value, ' ', value_len); /* Blank the string. */
}
if ((!trim_name) || *trim_name)
name_nt = fc_strdup (name, name_len);
else
name_nt = fc_strdup_notrim (name, name_len);
res = getenv(name_nt);
free (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 if (res_len > 0)
memcpy (value, res, res_len);
}
}
if (status != NULL)
*status = stat;
if (length != NULL)
*length = res_len;
}
iexport(get_environment_variable_i4);
/* INTEGER*8 wrapper for get_environment_variable. */
extern void get_environment_variable_i8 (char *, char *, GFC_INTEGER_8 *,
GFC_INTEGER_8 *, GFC_LOGICAL_8 *,
gfc_charlen_type, gfc_charlen_type);
export_proto(get_environment_variable_i8);
void
get_environment_variable_i8 (char *name, char *value, GFC_INTEGER_8 *length,
GFC_INTEGER_8 *status, GFC_LOGICAL_8 *trim_name,
gfc_charlen_type name_len,
gfc_charlen_type value_len)
{
GFC_INTEGER_4 length4, status4;
GFC_LOGICAL_4 trim_name4;
if (trim_name)
trim_name4 = *trim_name;
get_environment_variable_i4 (name, value, &length4, &status4,
trim_name ? &trim_name4 : NULL,
name_len, value_len);
if (length)
*length = length4;
if (status)
*status = status4;
}
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