henrike@webrtc.org | 0e118e7 | 2013-07-10 00:45:36 +0000 | [diff] [blame] | 1 | /* |
| 2 | * libjingle |
| 3 | * Copyright 2006, Google Inc. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions are met: |
| 7 | * |
| 8 | * 1. Redistributions of source code must retain the above copyright notice, |
| 9 | * this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * 3. The name of the author may not be used to endorse or promote products |
| 14 | * derived from this software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 18 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| 19 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 20 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 21 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| 22 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 23 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| 24 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 25 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #include <stdio.h> |
| 29 | #include <stdlib.h> |
| 30 | #include <string.h> |
| 31 | |
| 32 | |
| 33 | #ifdef WIN32 |
| 34 | #include "talk/base/win32.h" |
| 35 | #include <shellapi.h> |
| 36 | #endif |
| 37 | |
| 38 | #include "talk/base/flags.h" |
| 39 | |
| 40 | |
| 41 | // ----------------------------------------------------------------------------- |
| 42 | // Implementation of Flag |
| 43 | |
| 44 | Flag::Flag(const char* file, const char* name, const char* comment, |
| 45 | Type type, void* variable, FlagValue default__) |
| 46 | : file_(file), |
| 47 | name_(name), |
| 48 | comment_(comment), |
| 49 | type_(type), |
| 50 | variable_(reinterpret_cast<FlagValue*>(variable)), |
| 51 | default_(default__) { |
| 52 | FlagList::Register(this); |
| 53 | } |
| 54 | |
| 55 | |
| 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. |
| 62 | switch (type_) { |
| 63 | case Flag::BOOL: |
| 64 | variable_->b = default_.b; |
| 65 | return; |
| 66 | case Flag::INT: |
| 67 | variable_->i = default_.i; |
| 68 | return; |
| 69 | case Flag::FLOAT: |
| 70 | variable_->f = default_.f; |
| 71 | return; |
| 72 | case Flag::STRING: |
| 73 | variable_->s = default_.s; |
| 74 | return; |
| 75 | } |
| 76 | UNREACHABLE(); |
| 77 | } |
| 78 | |
| 79 | |
| 80 | static const char* Type2String(Flag::Type type) { |
| 81 | switch (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"; |
| 86 | } |
| 87 | UNREACHABLE(); |
| 88 | return NULL; |
| 89 | } |
| 90 | |
| 91 | |
| 92 | static void PrintFlagValue(Flag::Type type, FlagValue* p) { |
| 93 | switch (type) { |
| 94 | case Flag::BOOL: |
| 95 | printf("%s", (p->b ? "true" : "false")); |
| 96 | return; |
| 97 | case Flag::INT: |
| 98 | printf("%d", p->i); |
| 99 | return; |
| 100 | case Flag::FLOAT: |
| 101 | printf("%f", p->f); |
| 102 | return; |
| 103 | case Flag::STRING: |
| 104 | printf("%s", p->s); |
| 105 | return; |
| 106 | } |
| 107 | UNREACHABLE(); |
| 108 | } |
| 109 | |
| 110 | |
| 111 | void Flag::Print(bool print_current_value) { |
| 112 | printf(" --%s (%s) type: %s default: ", name_, comment_, |
| 113 | Type2String(type_)); |
| 114 | PrintFlagValue(type_, &default_); |
| 115 | if (print_current_value) { |
| 116 | printf(" current value: "); |
| 117 | PrintFlagValue(type_, variable_); |
| 118 | } |
| 119 | printf("\n"); |
| 120 | } |
| 121 | |
| 122 | |
| 123 | // ----------------------------------------------------------------------------- |
| 124 | // Implementation of FlagList |
| 125 | |
| 126 | Flag* FlagList::list_ = NULL; |
| 127 | |
| 128 | |
| 129 | FlagList::FlagList() { |
| 130 | list_ = NULL; |
| 131 | } |
| 132 | |
| 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()); |
| 141 | current = f->file(); |
| 142 | } |
| 143 | f->Print(print_current_value); |
| 144 | } |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | |
| 149 | Flag* FlagList::Lookup(const char* name) { |
| 150 | Flag* f = list_; |
| 151 | while (f != NULL && strcmp(name, f->name()) != 0) |
| 152 | f = f->next(); |
| 153 | return f; |
| 154 | } |
| 155 | |
| 156 | |
| 157 | void FlagList::SplitArgument(const char* arg, |
| 158 | char* buffer, int buffer_size, |
| 159 | const char** name, const char** value, |
| 160 | bool* is_bool) { |
| 161 | *name = NULL; |
| 162 | *value = NULL; |
| 163 | *is_bool = false; |
| 164 | |
| 165 | if (*arg == '-') { |
| 166 | // find the begin of the flag name |
| 167 | arg++; // remove 1st '-' |
| 168 | if (*arg == '-') |
| 169 | arg++; // remove 2nd '-' |
| 170 | if (arg[0] == 'n' && arg[1] == 'o') { |
| 171 | arg += 2; // remove "no" |
| 172 | *is_bool = true; |
| 173 | } |
| 174 | *name = arg; |
| 175 | |
| 176 | // find the end of the flag name |
| 177 | while (*arg != '\0' && *arg != '=') |
| 178 | arg++; |
| 179 | |
| 180 | // get the value if any |
| 181 | if (*arg == '=') { |
| 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)); |
| 187 | buffer[n] = '\0'; |
| 188 | *name = buffer; |
| 189 | // get the value |
| 190 | *value = arg + 1; |
| 191 | } |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | |
| 196 | int FlagList::SetFlagsFromCommandLine(int* argc, const char** argv, |
| 197 | bool remove_flags) { |
| 198 | // parse arguments |
| 199 | for (int i = 1; i < *argc; /* see below */) { |
| 200 | int j = i; // j > 0 |
| 201 | const char* arg = argv[i++]; |
| 202 | |
| 203 | // split arg into flag components |
| 204 | char buffer[1024]; |
| 205 | const char* name; |
| 206 | const char* value; |
| 207 | bool is_bool; |
| 208 | SplitArgument(arg, buffer, sizeof buffer, &name, &value, &is_bool); |
| 209 | |
| 210 | if (name != NULL) { |
| 211 | // lookup the flag |
| 212 | Flag* flag = Lookup(name); |
| 213 | if (flag == NULL) { |
| 214 | fprintf(stderr, "Error: unrecognized flag %s\n", arg); |
| 215 | return j; |
| 216 | } |
| 217 | |
| 218 | // if we still need a flag value, use the next argument if available |
| 219 | if (flag->type() != Flag::BOOL && value == NULL) { |
| 220 | if (i < *argc) { |
| 221 | value = argv[i++]; |
| 222 | } else { |
| 223 | fprintf(stderr, "Error: missing value for flag %s of type %s\n", |
| 224 | arg, Type2String(flag->type())); |
| 225 | return j; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | // set the flag |
| 230 | char empty[] = { '\0' }; |
| 231 | char* endp = empty; |
| 232 | switch (flag->type()) { |
| 233 | case Flag::BOOL: |
| 234 | *flag->bool_variable() = !is_bool; |
| 235 | break; |
| 236 | case Flag::INT: |
| 237 | *flag->int_variable() = strtol(value, &endp, 10); |
| 238 | break; |
| 239 | case Flag::FLOAT: |
| 240 | *flag->float_variable() = strtod(value, &endp); |
| 241 | break; |
| 242 | case Flag::STRING: |
| 243 | *flag->string_variable() = value; |
| 244 | break; |
| 245 | } |
| 246 | |
| 247 | // handle errors |
| 248 | if ((flag->type() == Flag::BOOL && value != NULL) || |
| 249 | (flag->type() != Flag::BOOL && is_bool) || |
| 250 | *endp != '\0') { |
| 251 | fprintf(stderr, "Error: illegal value for flag %s of type %s\n", |
| 252 | arg, Type2String(flag->type())); |
| 253 | return j; |
| 254 | } |
| 255 | |
| 256 | // remove the flag & value from the command |
| 257 | if (remove_flags) |
| 258 | while (j < i) |
| 259 | argv[j++] = NULL; |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | // shrink the argument list |
| 264 | if (remove_flags) { |
| 265 | int j = 1; |
| 266 | for (int i = 1; i < *argc; i++) { |
| 267 | if (argv[i] != NULL) |
| 268 | argv[j++] = argv[i]; |
| 269 | } |
| 270 | *argc = j; |
| 271 | } |
| 272 | |
| 273 | // parsed all flags successfully |
| 274 | return 0; |
| 275 | } |
| 276 | |
| 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()); |
| 281 | flag->next_ = list_; |
| 282 | list_ = flag; |
| 283 | } |
| 284 | |
| 285 | #ifdef WIN32 |
| 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_]; |
| 293 | |
| 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()); |
| 299 | |
| 300 | // make sure the argv array has the right string at this point. |
| 301 | argv_[i] = buffer; |
| 302 | } |
| 303 | LocalFree(wide_argv); |
| 304 | } |
| 305 | |
| 306 | WindowsCommandLineArguments::~WindowsCommandLineArguments() { |
| 307 | // need to free each string in the array, and then the array. |
| 308 | for(int i = 0; i < argc_; i++) { |
| 309 | delete[] argv_[i]; |
| 310 | } |
| 311 | |
| 312 | delete[] argv_; |
| 313 | } |
| 314 | #endif // WIN32 |
| 315 | |