| /* |
| * Copyright 2006 The WebRTC Project Authors. All rights reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "rtc_base/flags.h" |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "rtc_base/checks.h" |
| #include "rtc_base/stringutils.h" |
| |
| #if defined(WEBRTC_WIN) |
| #include <windows.h> |
| #include <shellapi.h> |
| #endif |
| |
| namespace rtc { |
| // ----------------------------------------------------------------------------- |
| // Implementation of Flag |
| |
| Flag::Flag(const char* file, const char* name, const char* comment, |
| Type type, void* variable, FlagValue default__) |
| : file_(file), |
| name_(name), |
| comment_(comment), |
| type_(type), |
| variable_(reinterpret_cast<FlagValue*>(variable)), |
| default_(default__) { |
| FlagList::Register(this); |
| } |
| |
| |
| void Flag::SetToDefault() { |
| // Note that we cannot simply do '*variable_ = default_;' since |
| // flag variables are not really of type FlagValue and thus may |
| // be smaller! The FlagValue union is simply 'overlayed' on top |
| // of a flag variable for convenient access. Since union members |
| // are guarantee to be aligned at the beginning, this works. |
| switch (type_) { |
| case Flag::BOOL: |
| variable_->b = default_.b; |
| return; |
| case Flag::INT: |
| variable_->i = default_.i; |
| return; |
| case Flag::FLOAT: |
| variable_->f = default_.f; |
| return; |
| case Flag::STRING: |
| variable_->s = default_.s; |
| return; |
| } |
| FATAL() << "unreachable code"; |
| } |
| |
| |
| static const char* Type2String(Flag::Type type) { |
| switch (type) { |
| case Flag::BOOL: return "bool"; |
| case Flag::INT: return "int"; |
| case Flag::FLOAT: return "float"; |
| case Flag::STRING: return "string"; |
| } |
| FATAL() << "unreachable code"; |
| } |
| |
| |
| static void PrintFlagValue(Flag::Type type, FlagValue* p) { |
| switch (type) { |
| case Flag::BOOL: |
| printf("%s", (p->b ? "true" : "false")); |
| return; |
| case Flag::INT: |
| printf("%d", p->i); |
| return; |
| case Flag::FLOAT: |
| printf("%f", p->f); |
| return; |
| case Flag::STRING: |
| printf("%s", p->s); |
| return; |
| } |
| FATAL() << "unreachable code"; |
| } |
| |
| |
| void Flag::Print(bool print_current_value) { |
| printf(" --%s (%s) type: %s default: ", name_, comment_, |
| Type2String(type_)); |
| PrintFlagValue(type_, &default_); |
| if (print_current_value) { |
| printf(" current value: "); |
| PrintFlagValue(type_, variable_); |
| } |
| printf("\n"); |
| } |
| |
| |
| // ----------------------------------------------------------------------------- |
| // Implementation of FlagList |
| |
| Flag* FlagList::list_ = nullptr; |
| |
| FlagList::FlagList() { |
| list_ = nullptr; |
| } |
| |
| void FlagList::Print(const char* file, bool print_current_value) { |
| // Since flag registration is likely by file (= C++ file), |
| // we don't need to sort by file and still get grouped output. |
| const char* current = nullptr; |
| for (Flag* f = list_; f != nullptr; f = f->next()) { |
| if (file == nullptr || file == f->file()) { |
| if (current != f->file()) { |
| printf("Flags from %s:\n", f->file()); |
| current = f->file(); |
| } |
| f->Print(print_current_value); |
| } |
| } |
| } |
| |
| |
| Flag* FlagList::Lookup(const char* name) { |
| Flag* f = list_; |
| while (f != nullptr && strcmp(name, f->name()) != 0) |
| f = f->next(); |
| return f; |
| } |
| |
| |
| void FlagList::SplitArgument(const char* arg, |
| char* buffer, int buffer_size, |
| const char** name, const char** value, |
| bool* is_bool) { |
| *name = nullptr; |
| *value = nullptr; |
| *is_bool = false; |
| |
| if (*arg == '-') { |
| // find the begin of the flag name |
| arg++; // remove 1st '-' |
| if (*arg == '-') |
| arg++; // remove 2nd '-' |
| if (arg[0] == 'n' && arg[1] == 'o' && Lookup(arg + 2)) { |
| arg += 2; // remove "no" |
| *is_bool = true; |
| } |
| *name = arg; |
| |
| // find the end of the flag name |
| while (*arg != '\0' && *arg != '=') |
| arg++; |
| |
| // get the value if any |
| if (*arg == '=') { |
| // make a copy so we can NUL-terminate flag name |
| int n = static_cast<int>(arg - *name); |
| RTC_CHECK_LT(n, buffer_size); |
| memcpy(buffer, *name, n * sizeof(char)); |
| buffer[n] = '\0'; |
| *name = buffer; |
| // get the value |
| *value = arg + 1; |
| } |
| } |
| } |
| |
| |
| int FlagList::SetFlagsFromCommandLine(int* argc, const char** argv, |
| bool remove_flags) { |
| // parse arguments |
| for (int i = 1; i < *argc; /* see below */) { |
| int j = i; // j > 0 |
| const char* arg = argv[i++]; |
| |
| // split arg into flag components |
| char buffer[1024]; |
| const char* name; |
| const char* value; |
| bool is_bool; |
| SplitArgument(arg, buffer, sizeof buffer, &name, &value, &is_bool); |
| |
| if (name != nullptr) { |
| // lookup the flag |
| Flag* flag = Lookup(name); |
| if (flag == nullptr) { |
| fprintf(stderr, "Error: unrecognized flag %s\n", arg); |
| return j; |
| } |
| |
| // if we still need a flag value, use the next argument if available |
| if (flag->type() != Flag::BOOL && value == nullptr) { |
| if (i < *argc) { |
| value = argv[i++]; |
| } else { |
| fprintf(stderr, "Error: missing value for flag %s of type %s\n", |
| arg, Type2String(flag->type())); |
| return j; |
| } |
| } |
| |
| // set the flag |
| char empty[] = { '\0' }; |
| char* endp = empty; |
| switch (flag->type()) { |
| case Flag::BOOL: |
| *flag->bool_variable() = !is_bool; |
| break; |
| case Flag::INT: |
| *flag->int_variable() = strtol(value, &endp, 10); |
| break; |
| case Flag::FLOAT: |
| *flag->float_variable() = strtod(value, &endp); |
| break; |
| case Flag::STRING: |
| *flag->string_variable() = value; |
| break; |
| } |
| |
| // handle errors |
| if ((flag->type() == Flag::BOOL && value != nullptr) || |
| (flag->type() != Flag::BOOL && is_bool) || *endp != '\0') { |
| fprintf(stderr, "Error: illegal value for flag %s of type %s\n", |
| arg, Type2String(flag->type())); |
| return j; |
| } |
| |
| // remove the flag & value from the command |
| if (remove_flags) |
| while (j < i) |
| argv[j++] = nullptr; |
| } |
| } |
| |
| // shrink the argument list |
| if (remove_flags) { |
| int j = 1; |
| for (int i = 1; i < *argc; i++) { |
| if (argv[i] != nullptr) |
| argv[j++] = argv[i]; |
| } |
| *argc = j; |
| } |
| |
| // parsed all flags successfully |
| return 0; |
| } |
| |
| void FlagList::Register(Flag* flag) { |
| RTC_DCHECK(flag); |
| RTC_DCHECK_GT(strlen(flag->name()), 0); |
| // NOTE: Don't call Lookup() within Register because it accesses the name_ |
| // of other flags in list_, and if the flags are coming from two different |
| // compilation units, the initialization order between them is undefined, and |
| // this will trigger an asan initialization-order-fiasco error. |
| flag->next_ = list_; |
| list_ = flag; |
| } |
| |
| #if defined(WEBRTC_WIN) |
| WindowsCommandLineArguments::WindowsCommandLineArguments() { |
| // start by getting the command line. |
| LPTSTR command_line = ::GetCommandLine(); |
| // now, convert it to a list of wide char strings. |
| LPWSTR *wide_argv = ::CommandLineToArgvW(command_line, &argc_); |
| // now allocate an array big enough to hold that many string pointers. |
| argv_ = new char*[argc_]; |
| |
| // iterate over the returned wide strings; |
| for(int i = 0; i < argc_; ++i) { |
| std::string s = rtc::ToUtf8(wide_argv[i], wcslen(wide_argv[i])); |
| char *buffer = new char[s.length() + 1]; |
| rtc::strcpyn(buffer, s.length() + 1, s.c_str()); |
| |
| // make sure the argv array has the right string at this point. |
| argv_[i] = buffer; |
| } |
| LocalFree(wide_argv); |
| } |
| |
| WindowsCommandLineArguments::~WindowsCommandLineArguments() { |
| // need to free each string in the array, and then the array. |
| for(int i = 0; i < argc_; i++) { |
| delete[] argv_[i]; |
| } |
| |
| delete[] argv_; |
| } |
| #endif // WEBRTC_WIN |
| |
| } // namespace rtc |