+ // If `input' ended with non-delim char, then we'll get here with
+ // the last word of `input' in `work'; copy it now.
+ if (!work.empty ()) {
+ output.push_back (strdup (work.c_str ()));
+ }
+}
+
+/// ParseEnvironmentOptions - An alternative entry point to the
+/// CommandLine library, which allows you to read the program's name
+/// from the caller (as PROGNAME) and its command-line arguments from
+/// an environment variable (whose name is given in ENVVAR).
+///
+void cl::ParseEnvironmentOptions(const char *progName, const char *envVar,
+ const char *Overview, bool ReadResponseFiles) {
+ // Check args.
+ assert(progName && "Program name not specified");
+ assert(envVar && "Environment variable name missing");
+
+ // Get the environment variable they want us to parse options out of.
+ const char *envValue = getenv(envVar);
+ if (!envValue)
+ return;
+
+ // Get program's "name", which we wouldn't know without the caller
+ // telling us.
+ std::vector<char*> newArgv;
+ newArgv.push_back(strdup(progName));
+
+ // Parse the value of the environment variable into a "command line"
+ // and hand it off to ParseCommandLineOptions().
+ ParseCStringVector(newArgv, envValue);
+ int newArgc = static_cast<int>(newArgv.size());
+ ParseCommandLineOptions(newArgc, &newArgv[0], Overview, ReadResponseFiles);
+
+ // Free all the strdup()ed strings.
+ for (std::vector<char*>::iterator i = newArgv.begin(), e = newArgv.end();
+ i != e; ++i)
+ free (*i);
+}
+
+
+/// ExpandResponseFiles - Copy the contents of argv into newArgv,
+/// substituting the contents of the response files for the arguments
+/// of type @file.
+static void ExpandResponseFiles(int argc, char** argv,
+ std::vector<char*>& newArgv) {
+ for (int i = 1; i != argc; ++i) {
+ char* arg = argv[i];
+
+ if (arg[0] == '@') {
+
+ sys::PathWithStatus respFile(++arg);
+
+ // Check that the response file is not empty (mmap'ing empty
+ // files can be problematic).
+ const sys::FileStatus *FileStat = respFile.getFileStatus();
+ if (FileStat && FileStat->getSize() != 0) {
+
+ // Mmap the response file into memory.
+ OwningPtr<MemoryBuffer>
+ respFilePtr(MemoryBuffer::getFile(respFile.c_str()));
+
+ // If we could open the file, parse its contents, otherwise
+ // pass the @file option verbatim.
+
+ // TODO: we should also support recursive loading of response files,
+ // since this is how gcc behaves. (From their man page: "The file may
+ // itself contain additional @file options; any such options will be
+ // processed recursively.")
+
+ if (respFilePtr != 0) {
+ ParseCStringVector(newArgv, respFilePtr->getBufferStart());
+ continue;
+ }
+ }
+ }
+ newArgv.push_back(strdup(arg));
+ }