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//===-- runtime/environment.cpp ---------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "environment.h"
#include "tools.h"
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <limits>
namespace Fortran::runtime {
ExecutionEnvironment executionEnvironment;
std::optional<Convert> GetConvertFromString(const char *x, std::size_t n) {
static const char *keywords[]{
"UNKNOWN", "NATIVE", "LITTLE_ENDIAN", "BIG_ENDIAN", "SWAP", nullptr};
switch (IdentifyValue(x, n, keywords)) {
case 0:
return Convert::Unknown;
case 1:
return Convert::Native;
case 2:
return Convert::LittleEndian;
case 3:
return Convert::BigEndian;
case 4:
return Convert::Swap;
default:
return std::nullopt;
}
}
void ExecutionEnvironment::Configure(
int ac, const char *av[], const char *env[]) {
argc = ac;
argv = av;
envp = env;
listDirectedOutputLineLengthLimit = 79; // PGI default
defaultOutputRoundingMode =
decimal::FortranRounding::RoundNearest; // RP(==RN)
conversion = Convert::Unknown;
if (auto *x{std::getenv("FORT_FMT_RECL")}) {
char *end;
auto n{std::strtol(x, &end, 10)};
if (n > 0 && n < std::numeric_limits<int>::max() && *end == '\0') {
listDirectedOutputLineLengthLimit = n;
} else {
std::fprintf(
stderr, "Fortran runtime: FORT_FMT_RECL=%s is invalid; ignored\n", x);
}
}
if (auto *x{std::getenv("FORT_CONVERT")}) {
if (auto convert{GetConvertFromString(x, std::strlen(x))}) {
conversion = *convert;
} else {
std::fprintf(
stderr, "Fortran runtime: FORT_CONVERT=%s is invalid; ignored\n", x);
}
}
// TODO: Set RP/ROUND='PROCESSOR_DEFINED' from environment
}
} // namespace Fortran::runtime
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