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Diffstat (limited to 'libgfortran/intrinsics/env.c')
| -rw-r--r-- | libgfortran/intrinsics/env.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/libgfortran/intrinsics/env.c b/libgfortran/intrinsics/env.c new file mode 100644 index 0000000000..f8e376e9df --- /dev/null +++ b/libgfortran/intrinsics/env.c @@ -0,0 +1,182 @@ +/* Implementation of the GETENV g77, and + GET_ENVIRONMENT_VARIABLE F2003, intrinsics. + Copyright (C) 2004-2017 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, 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 < 1) + runtime_error ("Zero-length string passed as value to " + "get_environment_variable."); + else + 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 + 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; +} |