util/OptionParser: loop in ParseNext() until a new option is found

src/CommandLine.cxx

@@ -313,9 +313,7 @@ ParseCommandLine(int argc, char **argv, struct options *options)
 
 	// First pass: handle command line options
 	OptionParser parser(argc, argv);
-	while (parser.HasEntries()) {
-		if (!parser.ParseNext())
-			continue;
+	while (parser.ParseNext()) {
 		if (parser.CheckOption(opt_kill)) {
 			options->kill = true;
 			continue;

src/util/OptionDef.hxx

@@ -20,6 +20,8 @@
 #ifndef MPD_UTIL_OPTIONDEF_HXX
 #define MPD_UTIL_OPTIONDEF_HXX
 
+#include <assert.h>
+
 /**
  * Command line option definition.
  */

src/util/OptionParser.cxx

@@ -39,23 +39,23 @@ OptionParser::CheckOption(const OptionDef &opt) const noexcept
 bool
 OptionParser::ParseNext() noexcept
 {
-	assert(HasEntries());
-	const char *arg = args.shift();
-	if (arg[0] == '-') {
-		if (arg[1] == '-') {
-			option = arg + 2;
-			is_long = true;
+	while (!args.empty()) {
+		const char *arg = args.shift();
+		if (arg[0] == '-') {
+			if (arg[1] == '-') {
+				option = arg + 2;
+				is_long = true;
+			}
+			else {
+				option = arg + 1;
+				is_long = false;
+			}
+			option_raw = arg;
+			return true;
 		}
-		else {
-			option = arg + 1;
-			is_long = false;
-		}
-		option_raw = arg;
-		return true;
+
+		*remaining_tail++ = arg;
 	}
 
-	option = nullptr;
-	option_raw = nullptr;
-	*remaining_tail++ = arg;
 	return false;
 }

src/util/OptionParser.hxx

@@ -22,8 +22,6 @@
 
 #include "util/ConstBuffer.hxx"
 
-#include <assert.h>
-
 class OptionDef;
 
 /**
@@ -32,8 +30,8 @@ class OptionDef;
 class OptionParser
 {
 	ConstBuffer<const char *> args;
-	const char *option = nullptr;
-	const char *option_raw = nullptr;
+	const char *option;
+	const char *option_raw;
 	bool is_long = false;
 
 	const char **const remaining_head, **remaining_tail;
@@ -42,23 +40,15 @@ public:
 	/**
 	 * Constructs #OptionParser.
 	 */
-	constexpr OptionParser(int _argc, char **_argv) noexcept
+	OptionParser(int _argc, char **_argv) noexcept
 		:args(_argv + 1, _argc - 1),
 		 remaining_head(const_cast<const char **>(_argv + 1)),
 		 remaining_tail(remaining_head) {}
 
-	/**
-	 * Checks if there are command line entries to process.
-	 */
-	constexpr bool HasEntries() const noexcept {
-		return !args.empty();
-	}
-
 	/**
 	 * Gets the last parsed option.
 	 */
 	const char *GetOption() noexcept {
-		assert(option_raw != nullptr);
 		return option_raw;
 	}
 
@@ -78,9 +68,11 @@ public:
 
 	/**
 	 * Parses current command line entry.
-	 * Returns true on success, false otherwise.
 	 * Regardless of result, advances current position to the next
 	 * command line entry. 
+	 *
+	 * @return true if an option was found, false if there are no
+	 * more options
 	 */
 	bool ParseNext() noexcept;