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Diffstat (limited to '3rdparty/benchmark/src/commandlineflags.cc')
-rw-r--r-- | 3rdparty/benchmark/src/commandlineflags.cc | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/3rdparty/benchmark/src/commandlineflags.cc b/3rdparty/benchmark/src/commandlineflags.cc new file mode 100644 index 00000000000..3e9a37a71d6 --- /dev/null +++ b/3rdparty/benchmark/src/commandlineflags.cc @@ -0,0 +1,220 @@ +// Copyright 2015 Google Inc. All rights reserved. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +#include "commandlineflags.h" + +#include <cstdlib> +#include <cstring> +#include <iostream> +#include <limits> + +namespace benchmark { +// Parses 'str' for a 32-bit signed integer. If successful, writes +// the result to *value and returns true; otherwise leaves *value +// unchanged and returns false. +bool ParseInt32(const std::string& src_text, const char* str, int32_t* value) { + // Parses the environment variable as a decimal integer. + char* end = nullptr; + const long long_value = strtol(str, &end, 10); // NOLINT + + // Has strtol() consumed all characters in the string? + if (*end != '\0') { + // No - an invalid character was encountered. + std::cerr << src_text << " is expected to be a 32-bit integer, " + << "but actually has value \"" << str << "\".\n"; + return false; + } + + // Is the parsed value in the range of an Int32? + const int32_t result = static_cast<int32_t>(long_value); + if (long_value == std::numeric_limits<long>::max() || + long_value == std::numeric_limits<long>::min() || + // The parsed value overflows as a long. (strtol() returns + // LONG_MAX or LONG_MIN when the input overflows.) + result != long_value + // The parsed value overflows as an Int32. + ) { + std::cerr << src_text << " is expected to be a 32-bit integer, " + << "but actually has value \"" << str << "\", " + << "which overflows.\n"; + return false; + } + + *value = result; + return true; +} + +// Parses 'str' for a double. If successful, writes the result to *value and +// returns true; otherwise leaves *value unchanged and returns false. +bool ParseDouble(const std::string& src_text, const char* str, double* value) { + // Parses the environment variable as a decimal integer. + char* end = nullptr; + const double double_value = strtod(str, &end); // NOLINT + + // Has strtol() consumed all characters in the string? + if (*end != '\0') { + // No - an invalid character was encountered. + std::cerr << src_text << " is expected to be a double, " + << "but actually has value \"" << str << "\".\n"; + return false; + } + + *value = double_value; + return true; +} + +inline const char* GetEnv(const char* name) { +#if defined(__BORLANDC__) || defined(__SunOS_5_8) || defined(__SunOS_5_9) + // Environment variables which we programmatically clear will be set to the + // empty string rather than unset (nullptr). Handle that case. + const char* const env = getenv(name); + return (env != nullptr && env[0] != '\0') ? env : nullptr; +#else + return getenv(name); +#endif +} + +// Returns the name of the environment variable corresponding to the +// given flag. For example, FlagToEnvVar("foo") will return +// "BENCHMARK_FOO" in the open-source version. +static std::string FlagToEnvVar(const char* flag) { + const std::string flag_str(flag); + + std::string env_var; + for (size_t i = 0; i != flag_str.length(); ++i) + env_var += static_cast<char>(::toupper(flag_str.c_str()[i])); + + return "BENCHMARK_" + env_var; +} + +// Reads and returns the Boolean environment variable corresponding to +// the given flag; if it's not set, returns default_value. +// +// The value is considered true iff it's not "0". +bool BoolFromEnv(const char* flag, bool default_value) { + const std::string env_var = FlagToEnvVar(flag); + const char* const string_value = GetEnv(env_var.c_str()); + return string_value == nullptr ? default_value : strcmp(string_value, "0") != 0; +} + +// Reads and returns a 32-bit integer stored in the environment +// variable corresponding to the given flag; if it isn't set or +// doesn't represent a valid 32-bit integer, returns default_value. +int32_t Int32FromEnv(const char* flag, int32_t default_value) { + const std::string env_var = FlagToEnvVar(flag); + const char* const string_value = GetEnv(env_var.c_str()); + if (string_value == nullptr) { + // The environment variable is not set. + return default_value; + } + + int32_t result = default_value; + if (!ParseInt32(std::string("Environment variable ") + env_var, string_value, + &result)) { + std::cout << "The default value " << default_value << " is used.\n"; + return default_value; + } + + return result; +} + +// Reads and returns the string environment variable corresponding to +// the given flag; if it's not set, returns default_value. +const char* StringFromEnv(const char* flag, const char* default_value) { + const std::string env_var = FlagToEnvVar(flag); + const char* const value = GetEnv(env_var.c_str()); + return value == nullptr ? default_value : value; +} + +// Parses a string as a command line flag. The string should have +// the format "--flag=value". When def_optional is true, the "=value" +// part can be omitted. +// +// Returns the value of the flag, or nullptr if the parsing failed. +const char* ParseFlagValue(const char* str, const char* flag, + bool def_optional) { + // str and flag must not be nullptr. + if (str == nullptr || flag == nullptr) return nullptr; + + // The flag must start with "--". + const std::string flag_str = std::string("--") + std::string(flag); + const size_t flag_len = flag_str.length(); + if (strncmp(str, flag_str.c_str(), flag_len) != 0) return nullptr; + + // Skips the flag name. + const char* flag_end = str + flag_len; + + // When def_optional is true, it's OK to not have a "=value" part. + if (def_optional && (flag_end[0] == '\0')) return flag_end; + + // If def_optional is true and there are more characters after the + // flag name, or if def_optional is false, there must be a '=' after + // the flag name. + if (flag_end[0] != '=') return nullptr; + + // Returns the string after "=". + return flag_end + 1; +} + +bool ParseBoolFlag(const char* str, const char* flag, bool* value) { + // Gets the value of the flag as a string. + const char* const value_str = ParseFlagValue(str, flag, true); + + // Aborts if the parsing failed. + if (value_str == nullptr) return false; + + // Converts the string value to a bool. + *value = !(*value_str == '0' || *value_str == 'f' || *value_str == 'F'); + return true; +} + +bool ParseInt32Flag(const char* str, const char* flag, int32_t* value) { + // Gets the value of the flag as a string. + const char* const value_str = ParseFlagValue(str, flag, false); + + // Aborts if the parsing failed. + if (value_str == nullptr) return false; + + // Sets *value to the value of the flag. + return ParseInt32(std::string("The value of flag --") + flag, value_str, + value); +} + +bool ParseDoubleFlag(const char* str, const char* flag, double* value) { + // Gets the value of the flag as a string. + const char* const value_str = ParseFlagValue(str, flag, false); + + // Aborts if the parsing failed. + if (value_str == nullptr) return false; + + // Sets *value to the value of the flag. + return ParseDouble(std::string("The value of flag --") + flag, value_str, + value); +} + +bool ParseStringFlag(const char* str, const char* flag, std::string* value) { + // Gets the value of the flag as a string. + const char* const value_str = ParseFlagValue(str, flag, false); + + // Aborts if the parsing failed. + if (value_str == nullptr) return false; + + *value = value_str; + return true; +} + +bool IsFlag(const char* str, const char* flag) { + return (ParseFlagValue(str, flag, true) != nullptr); +} +} // end namespace benchmark |