Line data Source code
1 : /*
2 : * Copyright 2006 The WebRTC Project Authors. All rights reserved.
3 : *
4 : * Use of this source code is governed by a BSD-style license
5 : * that can be found in the LICENSE file in the root of the source
6 : * tree. An additional intellectual property rights grant can be found
7 : * in the file PATENTS. All contributing project authors may
8 : * be found in the AUTHORS file in the root of the source tree.
9 : */
10 :
11 : #include "webrtc/base/flags.h"
12 :
13 : #include <stdio.h>
14 : #include <stdlib.h>
15 : #include <string.h>
16 :
17 : #include "webrtc/base/checks.h"
18 :
19 : #if defined(WEBRTC_WIN)
20 : #include "webrtc/base/win32.h"
21 : #include <shellapi.h>
22 : #endif
23 :
24 : namespace rtc {
25 : // -----------------------------------------------------------------------------
26 : // Implementation of Flag
27 :
28 0 : Flag::Flag(const char* file, const char* name, const char* comment,
29 0 : Type type, void* variable, FlagValue default__)
30 : : file_(file),
31 : name_(name),
32 : comment_(comment),
33 : type_(type),
34 : variable_(reinterpret_cast<FlagValue*>(variable)),
35 0 : default_(default__) {
36 0 : FlagList::Register(this);
37 0 : }
38 :
39 :
40 0 : void Flag::SetToDefault() {
41 : // Note that we cannot simply do '*variable_ = default_;' since
42 : // flag variables are not really of type FlagValue and thus may
43 : // be smaller! The FlagValue union is simply 'overlayed' on top
44 : // of a flag variable for convenient access. Since union members
45 : // are guarantee to be aligned at the beginning, this works.
46 0 : switch (type_) {
47 : case Flag::BOOL:
48 0 : variable_->b = default_.b;
49 0 : return;
50 : case Flag::INT:
51 0 : variable_->i = default_.i;
52 0 : return;
53 : case Flag::FLOAT:
54 0 : variable_->f = default_.f;
55 0 : return;
56 : case Flag::STRING:
57 0 : variable_->s = default_.s;
58 0 : return;
59 : }
60 0 : FATAL() << "unreachable code";
61 : }
62 :
63 :
64 0 : static const char* Type2String(Flag::Type type) {
65 0 : switch (type) {
66 0 : case Flag::BOOL: return "bool";
67 0 : case Flag::INT: return "int";
68 0 : case Flag::FLOAT: return "float";
69 0 : case Flag::STRING: return "string";
70 : }
71 0 : FATAL() << "unreachable code";
72 : }
73 :
74 :
75 0 : static void PrintFlagValue(Flag::Type type, FlagValue* p) {
76 0 : switch (type) {
77 : case Flag::BOOL:
78 0 : printf("%s", (p->b ? "true" : "false"));
79 0 : return;
80 : case Flag::INT:
81 0 : printf("%d", p->i);
82 0 : return;
83 : case Flag::FLOAT:
84 0 : printf("%f", p->f);
85 0 : return;
86 : case Flag::STRING:
87 0 : printf("%s", p->s);
88 0 : return;
89 : }
90 0 : FATAL() << "unreachable code";
91 : }
92 :
93 :
94 0 : void Flag::Print(bool print_current_value) {
95 0 : printf(" --%s (%s) type: %s default: ", name_, comment_,
96 0 : Type2String(type_));
97 0 : PrintFlagValue(type_, &default_);
98 0 : if (print_current_value) {
99 0 : printf(" current value: ");
100 0 : PrintFlagValue(type_, variable_);
101 : }
102 0 : printf("\n");
103 0 : }
104 :
105 :
106 : // -----------------------------------------------------------------------------
107 : // Implementation of FlagList
108 :
109 : Flag* FlagList::list_ = NULL;
110 :
111 :
112 0 : FlagList::FlagList() {
113 0 : list_ = NULL;
114 0 : }
115 :
116 0 : void FlagList::Print(const char* file, bool print_current_value) {
117 : // Since flag registration is likely by file (= C++ file),
118 : // we don't need to sort by file and still get grouped output.
119 0 : const char* current = NULL;
120 0 : for (Flag* f = list_; f != NULL; f = f->next()) {
121 0 : if (file == NULL || file == f->file()) {
122 0 : if (current != f->file()) {
123 0 : printf("Flags from %s:\n", f->file());
124 0 : current = f->file();
125 : }
126 0 : f->Print(print_current_value);
127 : }
128 : }
129 0 : }
130 :
131 :
132 0 : Flag* FlagList::Lookup(const char* name) {
133 0 : Flag* f = list_;
134 0 : while (f != NULL && strcmp(name, f->name()) != 0)
135 0 : f = f->next();
136 0 : return f;
137 : }
138 :
139 :
140 0 : void FlagList::SplitArgument(const char* arg,
141 : char* buffer, int buffer_size,
142 : const char** name, const char** value,
143 : bool* is_bool) {
144 0 : *name = NULL;
145 0 : *value = NULL;
146 0 : *is_bool = false;
147 :
148 0 : if (*arg == '-') {
149 : // find the begin of the flag name
150 0 : arg++; // remove 1st '-'
151 0 : if (*arg == '-')
152 0 : arg++; // remove 2nd '-'
153 0 : if (arg[0] == 'n' && arg[1] == 'o') {
154 0 : arg += 2; // remove "no"
155 0 : *is_bool = true;
156 : }
157 0 : *name = arg;
158 :
159 : // find the end of the flag name
160 0 : while (*arg != '\0' && *arg != '=')
161 0 : arg++;
162 :
163 : // get the value if any
164 0 : if (*arg == '=') {
165 : // make a copy so we can NUL-terminate flag name
166 0 : int n = static_cast<int>(arg - *name);
167 0 : RTC_CHECK_LT(n, buffer_size);
168 0 : memcpy(buffer, *name, n * sizeof(char));
169 0 : buffer[n] = '\0';
170 0 : *name = buffer;
171 : // get the value
172 0 : *value = arg + 1;
173 : }
174 : }
175 0 : }
176 :
177 :
178 0 : int FlagList::SetFlagsFromCommandLine(int* argc, const char** argv,
179 : bool remove_flags) {
180 : // parse arguments
181 0 : for (int i = 1; i < *argc; /* see below */) {
182 0 : int j = i; // j > 0
183 0 : const char* arg = argv[i++];
184 :
185 : // split arg into flag components
186 : char buffer[1024];
187 : const char* name;
188 : const char* value;
189 : bool is_bool;
190 0 : SplitArgument(arg, buffer, sizeof buffer, &name, &value, &is_bool);
191 :
192 0 : if (name != NULL) {
193 : // lookup the flag
194 0 : Flag* flag = Lookup(name);
195 0 : if (flag == NULL) {
196 0 : fprintf(stderr, "Error: unrecognized flag %s\n", arg);
197 0 : return j;
198 : }
199 :
200 : // if we still need a flag value, use the next argument if available
201 0 : if (flag->type() != Flag::BOOL && value == NULL) {
202 0 : if (i < *argc) {
203 0 : value = argv[i++];
204 : } else {
205 0 : fprintf(stderr, "Error: missing value for flag %s of type %s\n",
206 0 : arg, Type2String(flag->type()));
207 0 : return j;
208 : }
209 : }
210 :
211 : // set the flag
212 0 : char empty[] = { '\0' };
213 0 : char* endp = empty;
214 0 : switch (flag->type()) {
215 : case Flag::BOOL:
216 0 : *flag->bool_variable() = !is_bool;
217 0 : break;
218 : case Flag::INT:
219 0 : *flag->int_variable() = strtol(value, &endp, 10);
220 0 : break;
221 : case Flag::FLOAT:
222 0 : *flag->float_variable() = strtod(value, &endp);
223 0 : break;
224 : case Flag::STRING:
225 0 : *flag->string_variable() = value;
226 0 : break;
227 : }
228 :
229 : // handle errors
230 0 : if ((flag->type() == Flag::BOOL && value != NULL) ||
231 0 : (flag->type() != Flag::BOOL && is_bool) ||
232 0 : *endp != '\0') {
233 0 : fprintf(stderr, "Error: illegal value for flag %s of type %s\n",
234 0 : arg, Type2String(flag->type()));
235 0 : return j;
236 : }
237 :
238 : // remove the flag & value from the command
239 0 : if (remove_flags)
240 0 : while (j < i)
241 0 : argv[j++] = NULL;
242 : }
243 : }
244 :
245 : // shrink the argument list
246 0 : if (remove_flags) {
247 0 : int j = 1;
248 0 : for (int i = 1; i < *argc; i++) {
249 0 : if (argv[i] != NULL)
250 0 : argv[j++] = argv[i];
251 : }
252 0 : *argc = j;
253 : }
254 :
255 : // parsed all flags successfully
256 0 : return 0;
257 : }
258 :
259 0 : void FlagList::Register(Flag* flag) {
260 0 : RTC_DCHECK(flag);
261 0 : RTC_DCHECK_GT(strlen(flag->name()), 0);
262 : // NOTE: Don't call Lookup() within Register because it accesses the name_
263 : // of other flags in list_, and if the flags are coming from two different
264 : // compilation units, the initialization order between them is undefined, and
265 : // this will trigger an asan initialization-order-fiasco error.
266 0 : flag->next_ = list_;
267 0 : list_ = flag;
268 0 : }
269 :
270 : #if defined(WEBRTC_WIN)
271 : WindowsCommandLineArguments::WindowsCommandLineArguments() {
272 : // start by getting the command line.
273 : LPTSTR command_line = ::GetCommandLine();
274 : // now, convert it to a list of wide char strings.
275 : LPWSTR *wide_argv = ::CommandLineToArgvW(command_line, &argc_);
276 : // now allocate an array big enough to hold that many string pointers.
277 : argv_ = new char*[argc_];
278 :
279 : // iterate over the returned wide strings;
280 : for(int i = 0; i < argc_; ++i) {
281 : std::string s = rtc::ToUtf8(wide_argv[i], wcslen(wide_argv[i]));
282 : char *buffer = new char[s.length() + 1];
283 : rtc::strcpyn(buffer, s.length() + 1, s.c_str());
284 :
285 : // make sure the argv array has the right string at this point.
286 : argv_[i] = buffer;
287 : }
288 : LocalFree(wide_argv);
289 : }
290 :
291 : WindowsCommandLineArguments::~WindowsCommandLineArguments() {
292 : // need to free each string in the array, and then the array.
293 : for(int i = 0; i < argc_; i++) {
294 : delete[] argv_[i];
295 : }
296 :
297 : delete[] argv_;
298 : }
299 : #endif // WEBRTC_WIN
300 :
301 : } // namespace rtc
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