| File: | tools/lldb/source/Utility/Args.cpp |
| Warning: | line 723, column 5 Value stored to 'found_suffix' is never read |
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| 1 | //===-- Args.cpp ------------------------------------------------*- C++ -*-===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #include "lldb/Utility/Args.h" |
| 11 | #include "lldb/Utility/ConstString.h" |
| 12 | #include "lldb/Utility/FileSpec.h" |
| 13 | #include "lldb/Utility/Stream.h" |
| 14 | #include "lldb/Utility/StringList.h" |
| 15 | #include "llvm/ADT/StringSwitch.h" |
| 16 | |
| 17 | using namespace lldb; |
| 18 | using namespace lldb_private; |
| 19 | |
| 20 | // A helper function for argument parsing. |
| 21 | // Parses the initial part of the first argument using normal double quote |
| 22 | // rules: backslash escapes the double quote and itself. The parsed string is |
| 23 | // appended to the second argument. The function returns the unparsed portion |
| 24 | // of the string, starting at the closing quote. |
| 25 | static llvm::StringRef ParseDoubleQuotes(llvm::StringRef quoted, |
| 26 | std::string &result) { |
| 27 | // Inside double quotes, '\' and '"' are special. |
| 28 | static const char *k_escapable_characters = "\"\\"; |
| 29 | while (true) { |
| 30 | // Skip over over regular characters and append them. |
| 31 | size_t regular = quoted.find_first_of(k_escapable_characters); |
| 32 | result += quoted.substr(0, regular); |
| 33 | quoted = quoted.substr(regular); |
| 34 | |
| 35 | // If we have reached the end of string or the closing quote, we're done. |
| 36 | if (quoted.empty() || quoted.front() == '"') |
| 37 | break; |
| 38 | |
| 39 | // We have found a backslash. |
| 40 | quoted = quoted.drop_front(); |
| 41 | |
| 42 | if (quoted.empty()) { |
| 43 | // A lone backslash at the end of string, let's just append it. |
| 44 | result += '\\'; |
| 45 | break; |
| 46 | } |
| 47 | |
| 48 | // If the character after the backslash is not a whitelisted escapable |
| 49 | // character, we leave the character sequence untouched. |
| 50 | if (strchr(k_escapable_characters, quoted.front()) == nullptr) |
| 51 | result += '\\'; |
| 52 | |
| 53 | result += quoted.front(); |
| 54 | quoted = quoted.drop_front(); |
| 55 | } |
| 56 | |
| 57 | return quoted; |
| 58 | } |
| 59 | |
| 60 | static size_t ArgvToArgc(const char **argv) { |
| 61 | if (!argv) |
| 62 | return 0; |
| 63 | size_t count = 0; |
| 64 | while (*argv++) |
| 65 | ++count; |
| 66 | return count; |
| 67 | } |
| 68 | |
| 69 | // Trims all whitespace that can separate command line arguments from the left |
| 70 | // side of the string. |
| 71 | static llvm::StringRef ltrimForArgs(llvm::StringRef str) { |
| 72 | static const char *k_space_separators = " \t"; |
| 73 | return str.ltrim(k_space_separators); |
| 74 | } |
| 75 | |
| 76 | // A helper function for SetCommandString. Parses a single argument from the |
| 77 | // command string, processing quotes and backslashes in a shell-like manner. |
| 78 | // The function returns a tuple consisting of the parsed argument, the quote |
| 79 | // char used, and the unparsed portion of the string starting at the first |
| 80 | // unqouted, unescaped whitespace character. |
| 81 | static std::tuple<std::string, char, llvm::StringRef> |
| 82 | ParseSingleArgument(llvm::StringRef command) { |
| 83 | // Argument can be split into multiple discontiguous pieces, for example: |
| 84 | // "Hello ""World" |
| 85 | // this would result in a single argument "Hello World" (without the quotes) |
| 86 | // since the quotes would be removed and there is not space between the |
| 87 | // strings. |
| 88 | std::string arg; |
| 89 | |
| 90 | // Since we can have multiple quotes that form a single command in a command |
| 91 | // like: "Hello "world'!' (which will make a single argument "Hello world!") |
| 92 | // we remember the first quote character we encounter and use that for the |
| 93 | // quote character. |
| 94 | char first_quote_char = '\0'; |
| 95 | |
| 96 | bool arg_complete = false; |
| 97 | do { |
| 98 | // Skip over over regular characters and append them. |
| 99 | size_t regular = command.find_first_of(" \t\"'`\\"); |
| 100 | arg += command.substr(0, regular); |
| 101 | command = command.substr(regular); |
| 102 | |
| 103 | if (command.empty()) |
| 104 | break; |
| 105 | |
| 106 | char special = command.front(); |
| 107 | command = command.drop_front(); |
| 108 | switch (special) { |
| 109 | case '\\': |
| 110 | if (command.empty()) { |
| 111 | arg += '\\'; |
| 112 | break; |
| 113 | } |
| 114 | |
| 115 | // If the character after the backslash is not a whitelisted escapable |
| 116 | // character, we leave the character sequence untouched. |
| 117 | if (strchr(" \t\\'\"`", command.front()) == nullptr) |
| 118 | arg += '\\'; |
| 119 | |
| 120 | arg += command.front(); |
| 121 | command = command.drop_front(); |
| 122 | |
| 123 | break; |
| 124 | |
| 125 | case ' ': |
| 126 | case '\t': |
| 127 | // We are not inside any quotes, we just found a space after an argument. |
| 128 | // We are done. |
| 129 | arg_complete = true; |
| 130 | break; |
| 131 | |
| 132 | case '"': |
| 133 | case '\'': |
| 134 | case '`': |
| 135 | // We found the start of a quote scope. |
| 136 | if (first_quote_char == '\0') |
| 137 | first_quote_char = special; |
| 138 | |
| 139 | if (special == '"') |
| 140 | command = ParseDoubleQuotes(command, arg); |
| 141 | else { |
| 142 | // For single quotes, we simply skip ahead to the matching quote |
| 143 | // character (or the end of the string). |
| 144 | size_t quoted = command.find(special); |
| 145 | arg += command.substr(0, quoted); |
| 146 | command = command.substr(quoted); |
| 147 | } |
| 148 | |
| 149 | // If we found a closing quote, skip it. |
| 150 | if (!command.empty()) |
| 151 | command = command.drop_front(); |
| 152 | |
| 153 | break; |
| 154 | } |
| 155 | } while (!arg_complete); |
| 156 | |
| 157 | return std::make_tuple(arg, first_quote_char, command); |
| 158 | } |
| 159 | |
| 160 | Args::ArgEntry::ArgEntry(llvm::StringRef str, char quote) : quote(quote) { |
| 161 | size_t size = str.size(); |
| 162 | ptr.reset(new char[size + 1]); |
| 163 | |
| 164 | ::memcpy(data(), str.data() ? str.data() : "", size); |
| 165 | ptr[size] = 0; |
| 166 | ref = llvm::StringRef(c_str(), size); |
| 167 | } |
| 168 | |
| 169 | //---------------------------------------------------------------------- |
| 170 | // Args constructor |
| 171 | //---------------------------------------------------------------------- |
| 172 | Args::Args(llvm::StringRef command) { SetCommandString(command); } |
| 173 | |
| 174 | Args::Args(const Args &rhs) { *this = rhs; } |
| 175 | |
| 176 | Args::Args(const StringList &list) : Args() { |
| 177 | for (size_t i = 0; i < list.GetSize(); ++i) |
| 178 | AppendArgument(list[i]); |
| 179 | } |
| 180 | |
| 181 | Args &Args::operator=(const Args &rhs) { |
| 182 | Clear(); |
| 183 | |
| 184 | m_argv.clear(); |
| 185 | m_entries.clear(); |
| 186 | for (auto &entry : rhs.m_entries) { |
| 187 | m_entries.emplace_back(entry.ref, entry.quote); |
| 188 | m_argv.push_back(m_entries.back().data()); |
| 189 | } |
| 190 | m_argv.push_back(nullptr); |
| 191 | return *this; |
| 192 | } |
| 193 | |
| 194 | //---------------------------------------------------------------------- |
| 195 | // Destructor |
| 196 | //---------------------------------------------------------------------- |
| 197 | Args::~Args() {} |
| 198 | |
| 199 | void Args::Dump(Stream &s, const char *label_name) const { |
| 200 | if (!label_name) |
| 201 | return; |
| 202 | |
| 203 | int i = 0; |
| 204 | for (auto &entry : m_entries) { |
| 205 | s.Indent(); |
| 206 | s.Format("{0}[{1}]=\"{2}\"\n", label_name, i++, entry.ref); |
| 207 | } |
| 208 | s.Format("{0}[{1}]=NULL\n", label_name, i); |
| 209 | s.EOL(); |
| 210 | } |
| 211 | |
| 212 | bool Args::GetCommandString(std::string &command) const { |
| 213 | command.clear(); |
| 214 | |
| 215 | for (size_t i = 0; i < m_entries.size(); ++i) { |
| 216 | if (i > 0) |
| 217 | command += ' '; |
| 218 | command += m_entries[i].ref; |
| 219 | } |
| 220 | |
| 221 | return !m_entries.empty(); |
| 222 | } |
| 223 | |
| 224 | bool Args::GetQuotedCommandString(std::string &command) const { |
| 225 | command.clear(); |
| 226 | |
| 227 | for (size_t i = 0; i < m_entries.size(); ++i) { |
| 228 | if (i > 0) |
| 229 | command += ' '; |
| 230 | |
| 231 | if (m_entries[i].quote) { |
| 232 | command += m_entries[i].quote; |
| 233 | command += m_entries[i].ref; |
| 234 | command += m_entries[i].quote; |
| 235 | } else { |
| 236 | command += m_entries[i].ref; |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | return !m_entries.empty(); |
| 241 | } |
| 242 | |
| 243 | void Args::SetCommandString(llvm::StringRef command) { |
| 244 | Clear(); |
| 245 | m_argv.clear(); |
| 246 | |
| 247 | command = ltrimForArgs(command); |
| 248 | std::string arg; |
| 249 | char quote; |
| 250 | while (!command.empty()) { |
| 251 | std::tie(arg, quote, command) = ParseSingleArgument(command); |
| 252 | m_entries.emplace_back(arg, quote); |
| 253 | m_argv.push_back(m_entries.back().data()); |
| 254 | command = ltrimForArgs(command); |
| 255 | } |
| 256 | m_argv.push_back(nullptr); |
| 257 | } |
| 258 | |
| 259 | size_t Args::GetArgumentCount() const { return m_entries.size(); } |
| 260 | |
| 261 | const char *Args::GetArgumentAtIndex(size_t idx) const { |
| 262 | if (idx < m_argv.size()) |
| 263 | return m_argv[idx]; |
| 264 | return nullptr; |
| 265 | } |
| 266 | |
| 267 | char Args::GetArgumentQuoteCharAtIndex(size_t idx) const { |
| 268 | if (idx < m_entries.size()) |
| 269 | return m_entries[idx].quote; |
| 270 | return '\0'; |
| 271 | } |
| 272 | |
| 273 | char **Args::GetArgumentVector() { |
| 274 | assert(!m_argv.empty())((!m_argv.empty()) ? static_cast<void> (0) : __assert_fail ("!m_argv.empty()", "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Utility/Args.cpp" , 274, __PRETTY_FUNCTION__)); |
| 275 | // TODO: functions like execve and posix_spawnp exhibit undefined behavior |
| 276 | // when argv or envp is null. So the code below is actually wrong. However, |
| 277 | // other code in LLDB depends on it being null. The code has been acting |
| 278 | // this way for some time, so it makes sense to leave it this way until |
| 279 | // someone has the time to come along and fix it. |
| 280 | return (m_argv.size() > 1) ? m_argv.data() : nullptr; |
| 281 | } |
| 282 | |
| 283 | const char **Args::GetConstArgumentVector() const { |
| 284 | assert(!m_argv.empty())((!m_argv.empty()) ? static_cast<void> (0) : __assert_fail ("!m_argv.empty()", "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Utility/Args.cpp" , 284, __PRETTY_FUNCTION__)); |
| 285 | return (m_argv.size() > 1) ? const_cast<const char **>(m_argv.data()) |
| 286 | : nullptr; |
| 287 | } |
| 288 | |
| 289 | void Args::Shift() { |
| 290 | // Don't pop the last NULL terminator from the argv array |
| 291 | if (m_entries.empty()) |
| 292 | return; |
| 293 | m_argv.erase(m_argv.begin()); |
| 294 | m_entries.erase(m_entries.begin()); |
| 295 | } |
| 296 | |
| 297 | void Args::Unshift(llvm::StringRef arg_str, char quote_char) { |
| 298 | InsertArgumentAtIndex(0, arg_str, quote_char); |
| 299 | } |
| 300 | |
| 301 | void Args::AppendArguments(const Args &rhs) { |
| 302 | assert(m_argv.size() == m_entries.size() + 1)((m_argv.size() == m_entries.size() + 1) ? static_cast<void > (0) : __assert_fail ("m_argv.size() == m_entries.size() + 1" , "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Utility/Args.cpp" , 302, __PRETTY_FUNCTION__)); |
| 303 | assert(m_argv.back() == nullptr)((m_argv.back() == nullptr) ? static_cast<void> (0) : __assert_fail ("m_argv.back() == nullptr", "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Utility/Args.cpp" , 303, __PRETTY_FUNCTION__)); |
| 304 | m_argv.pop_back(); |
| 305 | for (auto &entry : rhs.m_entries) { |
| 306 | m_entries.emplace_back(entry.ref, entry.quote); |
| 307 | m_argv.push_back(m_entries.back().data()); |
| 308 | } |
| 309 | m_argv.push_back(nullptr); |
| 310 | } |
| 311 | |
| 312 | void Args::AppendArguments(const char **argv) { |
| 313 | size_t argc = ArgvToArgc(argv); |
| 314 | |
| 315 | assert(m_argv.size() == m_entries.size() + 1)((m_argv.size() == m_entries.size() + 1) ? static_cast<void > (0) : __assert_fail ("m_argv.size() == m_entries.size() + 1" , "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Utility/Args.cpp" , 315, __PRETTY_FUNCTION__)); |
| 316 | assert(m_argv.back() == nullptr)((m_argv.back() == nullptr) ? static_cast<void> (0) : __assert_fail ("m_argv.back() == nullptr", "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Utility/Args.cpp" , 316, __PRETTY_FUNCTION__)); |
| 317 | m_argv.pop_back(); |
| 318 | for (auto arg : llvm::makeArrayRef(argv, argc)) { |
| 319 | m_entries.emplace_back(arg, '\0'); |
| 320 | m_argv.push_back(m_entries.back().data()); |
| 321 | } |
| 322 | |
| 323 | m_argv.push_back(nullptr); |
| 324 | } |
| 325 | |
| 326 | void Args::AppendArgument(llvm::StringRef arg_str, char quote_char) { |
| 327 | InsertArgumentAtIndex(GetArgumentCount(), arg_str, quote_char); |
| 328 | } |
| 329 | |
| 330 | void Args::InsertArgumentAtIndex(size_t idx, llvm::StringRef arg_str, |
| 331 | char quote_char) { |
| 332 | assert(m_argv.size() == m_entries.size() + 1)((m_argv.size() == m_entries.size() + 1) ? static_cast<void > (0) : __assert_fail ("m_argv.size() == m_entries.size() + 1" , "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Utility/Args.cpp" , 332, __PRETTY_FUNCTION__)); |
| 333 | assert(m_argv.back() == nullptr)((m_argv.back() == nullptr) ? static_cast<void> (0) : __assert_fail ("m_argv.back() == nullptr", "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Utility/Args.cpp" , 333, __PRETTY_FUNCTION__)); |
| 334 | |
| 335 | if (idx > m_entries.size()) |
| 336 | return; |
| 337 | m_entries.emplace(m_entries.begin() + idx, arg_str, quote_char); |
| 338 | m_argv.insert(m_argv.begin() + idx, m_entries[idx].data()); |
| 339 | } |
| 340 | |
| 341 | void Args::ReplaceArgumentAtIndex(size_t idx, llvm::StringRef arg_str, |
| 342 | char quote_char) { |
| 343 | assert(m_argv.size() == m_entries.size() + 1)((m_argv.size() == m_entries.size() + 1) ? static_cast<void > (0) : __assert_fail ("m_argv.size() == m_entries.size() + 1" , "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Utility/Args.cpp" , 343, __PRETTY_FUNCTION__)); |
| 344 | assert(m_argv.back() == nullptr)((m_argv.back() == nullptr) ? static_cast<void> (0) : __assert_fail ("m_argv.back() == nullptr", "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Utility/Args.cpp" , 344, __PRETTY_FUNCTION__)); |
| 345 | |
| 346 | if (idx >= m_entries.size()) |
| 347 | return; |
| 348 | |
| 349 | if (arg_str.size() > m_entries[idx].ref.size()) { |
| 350 | m_entries[idx] = ArgEntry(arg_str, quote_char); |
| 351 | m_argv[idx] = m_entries[idx].data(); |
| 352 | } else { |
| 353 | const char *src_data = arg_str.data() ? arg_str.data() : ""; |
| 354 | ::memcpy(m_entries[idx].data(), src_data, arg_str.size()); |
| 355 | m_entries[idx].ptr[arg_str.size()] = 0; |
| 356 | m_entries[idx].ref = m_entries[idx].ref.take_front(arg_str.size()); |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | void Args::DeleteArgumentAtIndex(size_t idx) { |
| 361 | if (idx >= m_entries.size()) |
| 362 | return; |
| 363 | |
| 364 | m_argv.erase(m_argv.begin() + idx); |
| 365 | m_entries.erase(m_entries.begin() + idx); |
| 366 | } |
| 367 | |
| 368 | void Args::SetArguments(size_t argc, const char **argv) { |
| 369 | Clear(); |
| 370 | |
| 371 | auto args = llvm::makeArrayRef(argv, argc); |
| 372 | m_entries.resize(argc); |
| 373 | m_argv.resize(argc + 1); |
| 374 | for (size_t i = 0; i < args.size(); ++i) { |
| 375 | char quote = |
| 376 | ((args[i][0] == '\'') || (args[i][0] == '"') || (args[i][0] == '`')) |
| 377 | ? args[i][0] |
| 378 | : '\0'; |
| 379 | |
| 380 | m_entries[i] = ArgEntry(args[i], quote); |
| 381 | m_argv[i] = m_entries[i].data(); |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | void Args::SetArguments(const char **argv) { |
| 386 | SetArguments(ArgvToArgc(argv), argv); |
| 387 | } |
| 388 | |
| 389 | void Args::Clear() { |
| 390 | m_entries.clear(); |
| 391 | m_argv.clear(); |
| 392 | m_argv.push_back(nullptr); |
| 393 | } |
| 394 | |
| 395 | const char *Args::StripSpaces(std::string &s, bool leading, bool trailing, |
| 396 | bool return_null_if_empty) { |
| 397 | static const char *k_white_space = " \t\v"; |
| 398 | if (!s.empty()) { |
| 399 | if (leading) { |
| 400 | size_t pos = s.find_first_not_of(k_white_space); |
| 401 | if (pos == std::string::npos) |
| 402 | s.clear(); |
| 403 | else if (pos > 0) |
| 404 | s.erase(0, pos); |
| 405 | } |
| 406 | |
| 407 | if (trailing) { |
| 408 | size_t rpos = s.find_last_not_of(k_white_space); |
| 409 | if (rpos != std::string::npos && rpos + 1 < s.size()) |
| 410 | s.erase(rpos + 1); |
| 411 | } |
| 412 | } |
| 413 | if (return_null_if_empty && s.empty()) |
| 414 | return nullptr; |
| 415 | return s.c_str(); |
| 416 | } |
| 417 | |
| 418 | const char *Args::GetShellSafeArgument(const FileSpec &shell, |
| 419 | const char *unsafe_arg, |
| 420 | std::string &safe_arg) { |
| 421 | struct ShellDescriptor { |
| 422 | ConstString m_basename; |
| 423 | const char *m_escapables; |
| 424 | }; |
| 425 | |
| 426 | static ShellDescriptor g_Shells[] = {{ConstString("bash"), " '\"<>()&"}, |
| 427 | {ConstString("tcsh"), " '\"<>()&$"}, |
| 428 | {ConstString("sh"), " '\"<>()&"}}; |
| 429 | |
| 430 | // safe minimal set |
| 431 | const char *escapables = " '\""; |
| 432 | |
| 433 | if (auto basename = shell.GetFilename()) { |
| 434 | for (const auto &Shell : g_Shells) { |
| 435 | if (Shell.m_basename == basename) { |
| 436 | escapables = Shell.m_escapables; |
| 437 | break; |
| 438 | } |
| 439 | } |
| 440 | } |
| 441 | |
| 442 | safe_arg.assign(unsafe_arg); |
| 443 | size_t prev_pos = 0; |
| 444 | while (prev_pos < safe_arg.size()) { |
| 445 | // Escape spaces and quotes |
| 446 | size_t pos = safe_arg.find_first_of(escapables, prev_pos); |
| 447 | if (pos != std::string::npos) { |
| 448 | safe_arg.insert(pos, 1, '\\'); |
| 449 | prev_pos = pos + 2; |
| 450 | } else |
| 451 | break; |
| 452 | } |
| 453 | return safe_arg.c_str(); |
| 454 | } |
| 455 | |
| 456 | lldb::Encoding Args::StringToEncoding(llvm::StringRef s, |
| 457 | lldb::Encoding fail_value) { |
| 458 | return llvm::StringSwitch<lldb::Encoding>(s) |
| 459 | .Case("uint", eEncodingUint) |
| 460 | .Case("sint", eEncodingSint) |
| 461 | .Case("ieee754", eEncodingIEEE754) |
| 462 | .Case("vector", eEncodingVector) |
| 463 | .Default(fail_value); |
| 464 | } |
| 465 | |
| 466 | uint32_t Args::StringToGenericRegister(llvm::StringRef s) { |
| 467 | if (s.empty()) |
| 468 | return LLDB_INVALID_REGNUM(4294967295U); |
| 469 | uint32_t result = llvm::StringSwitch<uint32_t>(s) |
| 470 | .Case("pc", LLDB_REGNUM_GENERIC_PC0) |
| 471 | .Case("sp", LLDB_REGNUM_GENERIC_SP1) |
| 472 | .Case("fp", LLDB_REGNUM_GENERIC_FP2) |
| 473 | .Cases("ra", "lr", LLDB_REGNUM_GENERIC_RA3) |
| 474 | .Case("flags", LLDB_REGNUM_GENERIC_FLAGS4) |
| 475 | .Case("arg1", LLDB_REGNUM_GENERIC_ARG15) |
| 476 | .Case("arg2", LLDB_REGNUM_GENERIC_ARG26) |
| 477 | .Case("arg3", LLDB_REGNUM_GENERIC_ARG37) |
| 478 | .Case("arg4", LLDB_REGNUM_GENERIC_ARG48) |
| 479 | .Case("arg5", LLDB_REGNUM_GENERIC_ARG59) |
| 480 | .Case("arg6", LLDB_REGNUM_GENERIC_ARG610) |
| 481 | .Case("arg7", LLDB_REGNUM_GENERIC_ARG711) |
| 482 | .Case("arg8", LLDB_REGNUM_GENERIC_ARG812) |
| 483 | .Default(LLDB_INVALID_REGNUM(4294967295U)); |
| 484 | return result; |
| 485 | } |
| 486 | |
| 487 | void Args::EncodeEscapeSequences(const char *src, std::string &dst) { |
| 488 | dst.clear(); |
| 489 | if (src) { |
| 490 | for (const char *p = src; *p != '\0'; ++p) { |
| 491 | size_t non_special_chars = ::strcspn(p, "\\"); |
| 492 | if (non_special_chars > 0) { |
| 493 | dst.append(p, non_special_chars); |
| 494 | p += non_special_chars; |
| 495 | if (*p == '\0') |
| 496 | break; |
| 497 | } |
| 498 | |
| 499 | if (*p == '\\') { |
| 500 | ++p; // skip the slash |
| 501 | switch (*p) { |
| 502 | case 'a': |
| 503 | dst.append(1, '\a'); |
| 504 | break; |
| 505 | case 'b': |
| 506 | dst.append(1, '\b'); |
| 507 | break; |
| 508 | case 'f': |
| 509 | dst.append(1, '\f'); |
| 510 | break; |
| 511 | case 'n': |
| 512 | dst.append(1, '\n'); |
| 513 | break; |
| 514 | case 'r': |
| 515 | dst.append(1, '\r'); |
| 516 | break; |
| 517 | case 't': |
| 518 | dst.append(1, '\t'); |
| 519 | break; |
| 520 | case 'v': |
| 521 | dst.append(1, '\v'); |
| 522 | break; |
| 523 | case '\\': |
| 524 | dst.append(1, '\\'); |
| 525 | break; |
| 526 | case '\'': |
| 527 | dst.append(1, '\''); |
| 528 | break; |
| 529 | case '"': |
| 530 | dst.append(1, '"'); |
| 531 | break; |
| 532 | case '0': |
| 533 | // 1 to 3 octal chars |
| 534 | { |
| 535 | // Make a string that can hold onto the initial zero char, up to 3 |
| 536 | // octal digits, and a terminating NULL. |
| 537 | char oct_str[5] = {'\0', '\0', '\0', '\0', '\0'}; |
| 538 | |
| 539 | int i; |
| 540 | for (i = 0; (p[i] >= '0' && p[i] <= '7') && i < 4; ++i) |
| 541 | oct_str[i] = p[i]; |
| 542 | |
| 543 | // We don't want to consume the last octal character since the main |
| 544 | // for loop will do this for us, so we advance p by one less than i |
| 545 | // (even if i is zero) |
| 546 | p += i - 1; |
| 547 | unsigned long octal_value = ::strtoul(oct_str, nullptr, 8); |
| 548 | if (octal_value <= UINT8_MAX(255)) { |
| 549 | dst.append(1, (char)octal_value); |
| 550 | } |
| 551 | } |
| 552 | break; |
| 553 | |
| 554 | case 'x': |
| 555 | // hex number in the format |
| 556 | if (isxdigit(p[1])) { |
| 557 | ++p; // Skip the 'x' |
| 558 | |
| 559 | // Make a string that can hold onto two hex chars plus a |
| 560 | // NULL terminator |
| 561 | char hex_str[3] = {*p, '\0', '\0'}; |
| 562 | if (isxdigit(p[1])) { |
| 563 | ++p; // Skip the first of the two hex chars |
| 564 | hex_str[1] = *p; |
| 565 | } |
| 566 | |
| 567 | unsigned long hex_value = strtoul(hex_str, nullptr, 16); |
| 568 | if (hex_value <= UINT8_MAX(255)) |
| 569 | dst.append(1, (char)hex_value); |
| 570 | } else { |
| 571 | dst.append(1, 'x'); |
| 572 | } |
| 573 | break; |
| 574 | |
| 575 | default: |
| 576 | // Just desensitize any other character by just printing what came |
| 577 | // after the '\' |
| 578 | dst.append(1, *p); |
| 579 | break; |
| 580 | } |
| 581 | } |
| 582 | } |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | void Args::ExpandEscapedCharacters(const char *src, std::string &dst) { |
| 587 | dst.clear(); |
| 588 | if (src) { |
| 589 | for (const char *p = src; *p != '\0'; ++p) { |
| 590 | if (isprint(*p)) |
| 591 | dst.append(1, *p); |
| 592 | else { |
| 593 | switch (*p) { |
| 594 | case '\a': |
| 595 | dst.append("\\a"); |
| 596 | break; |
| 597 | case '\b': |
| 598 | dst.append("\\b"); |
| 599 | break; |
| 600 | case '\f': |
| 601 | dst.append("\\f"); |
| 602 | break; |
| 603 | case '\n': |
| 604 | dst.append("\\n"); |
| 605 | break; |
| 606 | case '\r': |
| 607 | dst.append("\\r"); |
| 608 | break; |
| 609 | case '\t': |
| 610 | dst.append("\\t"); |
| 611 | break; |
| 612 | case '\v': |
| 613 | dst.append("\\v"); |
| 614 | break; |
| 615 | case '\'': |
| 616 | dst.append("\\'"); |
| 617 | break; |
| 618 | case '"': |
| 619 | dst.append("\\\""); |
| 620 | break; |
| 621 | case '\\': |
| 622 | dst.append("\\\\"); |
| 623 | break; |
| 624 | default: { |
| 625 | // Just encode as octal |
| 626 | dst.append("\\0"); |
| 627 | char octal_str[32]; |
| 628 | snprintf(octal_str, sizeof(octal_str), "%o", *p); |
| 629 | dst.append(octal_str); |
| 630 | } break; |
| 631 | } |
| 632 | } |
| 633 | } |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | std::string Args::EscapeLLDBCommandArgument(const std::string &arg, |
| 638 | char quote_char) { |
| 639 | const char *chars_to_escape = nullptr; |
| 640 | switch (quote_char) { |
| 641 | case '\0': |
| 642 | chars_to_escape = " \t\\'\"`"; |
| 643 | break; |
| 644 | case '\'': |
| 645 | chars_to_escape = ""; |
| 646 | break; |
| 647 | case '"': |
| 648 | chars_to_escape = "$\"`\\"; |
| 649 | break; |
| 650 | default: |
| 651 | assert(false && "Unhandled quote character")((false && "Unhandled quote character") ? static_cast <void> (0) : __assert_fail ("false && \"Unhandled quote character\"" , "/build/llvm-toolchain-snapshot-8~svn345461/tools/lldb/source/Utility/Args.cpp" , 651, __PRETTY_FUNCTION__)); |
| 652 | } |
| 653 | |
| 654 | std::string res; |
| 655 | res.reserve(arg.size()); |
| 656 | for (char c : arg) { |
| 657 | if (::strchr(chars_to_escape, c)) |
| 658 | res.push_back('\\'); |
| 659 | res.push_back(c); |
| 660 | } |
| 661 | return res; |
| 662 | } |
| 663 | |
| 664 | OptionsWithRaw::OptionsWithRaw(llvm::StringRef arg_string) { |
| 665 | SetFromString(arg_string); |
| 666 | } |
| 667 | |
| 668 | void OptionsWithRaw::SetFromString(llvm::StringRef arg_string) { |
| 669 | const llvm::StringRef original_args = arg_string; |
| 670 | |
| 671 | arg_string = ltrimForArgs(arg_string); |
| 672 | std::string arg; |
| 673 | char quote; |
| 674 | |
| 675 | // If the string doesn't start with a dash, we just have no options and just |
| 676 | // a raw part. |
| 677 | if (!arg_string.startswith("-")) { |
| 678 | m_suffix = original_args; |
| 679 | return; |
| 680 | } |
| 681 | |
| 682 | bool found_suffix = false; |
| 683 | |
| 684 | while (!arg_string.empty()) { |
| 685 | // The length of the prefix before parsing. |
| 686 | std::size_t prev_prefix_length = original_args.size() - arg_string.size(); |
| 687 | |
| 688 | // Parse the next argument from the remaining string. |
| 689 | std::tie(arg, quote, arg_string) = ParseSingleArgument(arg_string); |
| 690 | |
| 691 | // If we get an unquoted '--' argument, then we reached the suffix part |
| 692 | // of the command. |
| 693 | Args::ArgEntry entry(arg, quote); |
| 694 | if (!entry.IsQuoted() && arg == "--") { |
| 695 | // The remaining line is the raw suffix, and the line we parsed so far |
| 696 | // needs to be interpreted as arguments. |
| 697 | m_has_args = true; |
| 698 | m_suffix = arg_string; |
| 699 | found_suffix = true; |
| 700 | |
| 701 | // The length of the prefix after parsing. |
| 702 | std::size_t prefix_length = original_args.size() - arg_string.size(); |
| 703 | |
| 704 | // Take the string we know contains all the arguments and actually parse |
| 705 | // it as proper arguments. |
| 706 | llvm::StringRef prefix = original_args.take_front(prev_prefix_length); |
| 707 | m_args = Args(prefix); |
| 708 | m_arg_string = prefix; |
| 709 | |
| 710 | // We also record the part of the string that contains the arguments plus |
| 711 | // the delimiter. |
| 712 | m_arg_string_with_delimiter = original_args.take_front(prefix_length); |
| 713 | |
| 714 | // As the rest of the string became the raw suffix, we are done here. |
| 715 | break; |
| 716 | } |
| 717 | |
| 718 | arg_string = ltrimForArgs(arg_string); |
| 719 | } |
| 720 | |
| 721 | // If we didn't find a suffix delimiter, the whole string is the raw suffix. |
| 722 | if (!found_suffix) { |
| 723 | found_suffix = true; |
Value stored to 'found_suffix' is never read | |
| 724 | m_suffix = original_args; |
| 725 | } |
| 726 | } |