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34 #include "talk/base/win32.h"
38 #include "talk/base/flags.h"
41 // -----------------------------------------------------------------------------
42 // Implementation of Flag
44 Flag::Flag(const char* file, const char* name, const char* comment,
45 Type type, void* variable, FlagValue default__)
50 variable_(reinterpret_cast<FlagValue*>(variable)),
52 FlagList::Register(this);
56 void Flag::SetToDefault() {
57 // Note that we cannot simply do '*variable_ = default_;' since
58 // flag variables are not really of type FlagValue and thus may
59 // be smaller! The FlagValue union is simply 'overlayed' on top
60 // of a flag variable for convenient access. Since union members
61 // are guarantee to be aligned at the beginning, this works.
64 variable_->b = default_.b;
67 variable_->i = default_.i;
70 variable_->f = default_.f;
73 variable_->s = default_.s;
80 static const char* Type2String(Flag::Type type) {
82 case Flag::BOOL: return "bool";
83 case Flag::INT: return "int";
84 case Flag::FLOAT: return "float";
85 case Flag::STRING: return "string";
92 static void PrintFlagValue(Flag::Type type, FlagValue* p) {
95 printf("%s", (p->b ? "true" : "false"));
111 void Flag::Print(bool print_current_value) {
112 printf(" --%s (%s) type: %s default: ", name_, comment_,
114 PrintFlagValue(type_, &default_);
115 if (print_current_value) {
116 printf(" current value: ");
117 PrintFlagValue(type_, variable_);
123 // -----------------------------------------------------------------------------
124 // Implementation of FlagList
126 Flag* FlagList::list_ = NULL;
129 FlagList::FlagList() {
133 void FlagList::Print(const char* file, bool print_current_value) {
134 // Since flag registration is likely by file (= C++ file),
135 // we don't need to sort by file and still get grouped output.
136 const char* current = NULL;
137 for (Flag* f = list_; f != NULL; f = f->next()) {
138 if (file == NULL || file == f->file()) {
139 if (current != f->file()) {
140 printf("Flags from %s:\n", f->file());
143 f->Print(print_current_value);
149 Flag* FlagList::Lookup(const char* name) {
151 while (f != NULL && strcmp(name, f->name()) != 0)
157 void FlagList::SplitArgument(const char* arg,
158 char* buffer, int buffer_size,
159 const char** name, const char** value,
166 // find the begin of the flag name
167 arg++; // remove 1st '-'
169 arg++; // remove 2nd '-'
170 if (arg[0] == 'n' && arg[1] == 'o') {
171 arg += 2; // remove "no"
176 // find the end of the flag name
177 while (*arg != '\0' && *arg != '=')
180 // get the value if any
182 // make a copy so we can NUL-terminate flag name
183 int n = static_cast<int>(arg - *name);
184 if (n >= buffer_size)
185 Fatal(__FILE__, __LINE__, "CHECK(%s) failed", "n < buffer_size");
186 memcpy(buffer, *name, n * sizeof(char));
196 int FlagList::SetFlagsFromCommandLine(int* argc, const char** argv,
199 for (int i = 1; i < *argc; /* see below */) {
201 const char* arg = argv[i++];
203 // split arg into flag components
208 SplitArgument(arg, buffer, sizeof buffer, &name, &value, &is_bool);
212 Flag* flag = Lookup(name);
214 fprintf(stderr, "Error: unrecognized flag %s\n", arg);
218 // if we still need a flag value, use the next argument if available
219 if (flag->type() != Flag::BOOL && value == NULL) {
223 fprintf(stderr, "Error: missing value for flag %s of type %s\n",
224 arg, Type2String(flag->type()));
230 char empty[] = { '\0' };
232 switch (flag->type()) {
234 *flag->bool_variable() = !is_bool;
237 *flag->int_variable() = strtol(value, &endp, 10);
240 *flag->float_variable() = strtod(value, &endp);
243 *flag->string_variable() = value;
248 if ((flag->type() == Flag::BOOL && value != NULL) ||
249 (flag->type() != Flag::BOOL && is_bool) ||
251 fprintf(stderr, "Error: illegal value for flag %s of type %s\n",
252 arg, Type2String(flag->type()));
256 // remove the flag & value from the command
263 // shrink the argument list
266 for (int i = 1; i < *argc; i++) {
273 // parsed all flags successfully
277 void FlagList::Register(Flag* flag) {
278 assert(flag != NULL && strlen(flag->name()) > 0);
279 if (Lookup(flag->name()) != NULL)
280 Fatal(flag->file(), 0, "flag %s declared twice", flag->name());
286 WindowsCommandLineArguments::WindowsCommandLineArguments() {
287 // start by getting the command line.
288 LPTSTR command_line = ::GetCommandLine();
289 // now, convert it to a list of wide char strings.
290 LPWSTR *wide_argv = ::CommandLineToArgvW(command_line, &argc_);
291 // now allocate an array big enough to hold that many string pointers.
292 argv_ = new char*[argc_];
294 // iterate over the returned wide strings;
295 for(int i = 0; i < argc_; ++i) {
296 std::string s = talk_base::ToUtf8(wide_argv[i], wcslen(wide_argv[i]));
297 char *buffer = new char[s.length() + 1];
298 talk_base::strcpyn(buffer, s.length() + 1, s.c_str());
300 // make sure the argv array has the right string at this point.
303 LocalFree(wide_argv);
306 WindowsCommandLineArguments::~WindowsCommandLineArguments() {
307 // need to free each string in the array, and then the array.
308 for(int i = 0; i < argc_; i++) {