1/* Implementation of the GETENV g77, and 2 GET_ENVIRONMENT_VARIABLE F2003, intrinsics. 3 Copyright (C) 2004-2020 Free Software Foundation, Inc. 4 Contributed by Janne Blomqvist. 5 6This file is part of the GNU Fortran 95 runtime library (libgfortran). 7 8Libgfortran is free software; you can redistribute it and/or 9modify it under the terms of the GNU General Public 10License as published by the Free Software Foundation; either 11version 3 of the License, or (at your option) any later version. 12 13Libgfortran is distributed in the hope that it will be useful, 14but WITHOUT ANY WARRANTY; without even the implied warranty of 15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16GNU General Public License for more details. 17 18Under Section 7 of GPL version 3, you are granted additional 19permissions described in the GCC Runtime Library Exception, version 203.1, as published by the Free Software Foundation. 21 22You should have received a copy of the GNU General Public License and 23a copy of the GCC Runtime Library Exception along with this program; 24see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 25<http://www.gnu.org/licenses/>. */ 26 27#include "libgfortran.h" 28#include <string.h> 29 30 31/* GETENV (NAME, VALUE), g77 intrinsic for retrieving the value of 32 an environment variable. The name of the variable is specified in 33 NAME, and the result is stored into VALUE. */ 34 35void PREFIX(getenv) (char *, char *, gfc_charlen_type, gfc_charlen_type); 36export_proto_np(PREFIX(getenv)); 37 38void 39PREFIX(getenv) (char * name, char * value, gfc_charlen_type name_len, 40 gfc_charlen_type value_len) 41{ 42 char *name_nt; 43 char *res = NULL; 44 45 if (name == NULL || value == NULL) 46 runtime_error ("Both arguments to getenv are mandatory."); 47 48 if (value_len < 1 || name_len < 1) 49 runtime_error ("Zero length string(s) passed to getenv."); 50 else 51 memset (value, ' ', value_len); /* Blank the string. */ 52 53 /* Make a null terminated copy of the string. */ 54 name_nt = fc_strdup (name, name_len); 55 56 res = getenv(name_nt); 57 58 free (name_nt); 59 60 /* If res is NULL, it means that the environment variable didn't 61 exist, so just return. */ 62 if (res == NULL) 63 return; 64 65 cf_strcpy (value, value_len, res); 66} 67 68 69/* GET_ENVIRONMENT_VARIABLE (name, [value, length, status, trim_name]) 70 is a F2003 intrinsic for getting an environment variable. */ 71 72/* Status codes specifyed by the standard. */ 73#define GFC_SUCCESS 0 74#define GFC_VALUE_TOO_SHORT -1 75#define GFC_NAME_DOES_NOT_EXIST 1 76 77/* This is also specified by the standard and means that the 78 processor doesn't support environment variables. At the moment, 79 gfortran doesn't use it. */ 80#define GFC_NOT_SUPPORTED 2 81 82/* Processor-specific failure code. */ 83#define GFC_FAILURE 42 84 85extern void get_environment_variable_i4 (char *, char *, GFC_INTEGER_4 *, 86 GFC_INTEGER_4 *, GFC_LOGICAL_4 *, 87 gfc_charlen_type, gfc_charlen_type); 88iexport_proto(get_environment_variable_i4); 89 90void 91get_environment_variable_i4 (char *name, char *value, GFC_INTEGER_4 *length, 92 GFC_INTEGER_4 *status, GFC_LOGICAL_4 *trim_name, 93 gfc_charlen_type name_len, 94 gfc_charlen_type value_len) 95{ 96 int stat = GFC_SUCCESS; 97 gfc_charlen_type res_len = 0; 98 char *name_nt; 99 char *res; 100 101 if (name == NULL) 102 runtime_error ("Name is required for get_environment_variable."); 103 104 if (value == NULL && length == NULL && status == NULL && trim_name == NULL) 105 return; 106 107 if (name_len < 1) 108 runtime_error ("Zero-length string passed as name to " 109 "get_environment_variable."); 110 111 if (value != NULL) 112 { 113 if (value_len > 0) 114 memset (value, ' ', value_len); /* Blank the string. */ 115 } 116 117 if ((!trim_name) || *trim_name) 118 name_nt = fc_strdup (name, name_len); 119 else 120 name_nt = fc_strdup_notrim (name, name_len); 121 122 res = getenv(name_nt); 123 124 free (name_nt); 125 126 if (res == NULL) 127 stat = GFC_NAME_DOES_NOT_EXIST; 128 else 129 { 130 res_len = strlen(res); 131 if (value != NULL) 132 { 133 if (value_len < res_len) 134 { 135 memcpy (value, res, value_len); 136 stat = GFC_VALUE_TOO_SHORT; 137 } 138 else if (res_len > 0) 139 memcpy (value, res, res_len); 140 } 141 } 142 143 if (status != NULL) 144 *status = stat; 145 146 if (length != NULL) 147 *length = res_len; 148} 149iexport(get_environment_variable_i4); 150 151 152/* INTEGER*8 wrapper for get_environment_variable. */ 153 154extern void get_environment_variable_i8 (char *, char *, GFC_INTEGER_8 *, 155 GFC_INTEGER_8 *, GFC_LOGICAL_8 *, 156 gfc_charlen_type, gfc_charlen_type); 157export_proto(get_environment_variable_i8); 158 159void 160get_environment_variable_i8 (char *name, char *value, GFC_INTEGER_8 *length, 161 GFC_INTEGER_8 *status, GFC_LOGICAL_8 *trim_name, 162 gfc_charlen_type name_len, 163 gfc_charlen_type value_len) 164{ 165 GFC_INTEGER_4 length4, status4; 166 GFC_LOGICAL_4 trim_name4; 167 168 if (trim_name) 169 trim_name4 = *trim_name; 170 171 get_environment_variable_i4 (name, value, &length4, &status4, 172 trim_name ? &trim_name4 : NULL, 173 name_len, value_len); 174 175 if (length) 176 *length = length4; 177 178 if (status) 179 *status = status4; 180} 181