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util/OptionParser: collect remaining arguments 

Allow the caller to use a simple "for" loop without checking
arguments.
This commit is contained in:
Max Kellermann 2018-01-16 11:03:04 +01:00
parent 0066f7a818
commit 68f660dbcc
3 changed files with 13 additions and 10 deletions
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6
src/CommandLine.cxx
View File

@ -357,11 +357,9 @@ ParseCommandLine(int argc, char **argv, struct options *options)
// Second pass: find non-option parameters (i.e. config file)
const char *config_file = nullptr;
for (int i = 1; i < argc; ++i) {
if (OptionParser::IsOption(argv[i]))
continue;
for (const char *i : parser.GetRemaining()) {
if (config_file == nullptr) {
config_file = argv[i];
config_file = i;
continue;
}

2
src/util/OptionParser.cxx
View File

@ -53,7 +53,9 @@ OptionParser::ParseNext() noexcept
option_raw = arg;
return true;
}
option = nullptr;
option_raw = nullptr;
*remaining_tail++ = arg;
return false;
}

15
src/util/OptionParser.hxx
View File

@ -36,12 +36,16 @@ class OptionParser
const char *option_raw = nullptr;
bool is_long = false;
const char **const remaining_head, **remaining_tail;
public:
/**
* Constructs #OptionParser.
*/
constexpr OptionParser(int _argc, char *const*_argv) noexcept
:args(_argv + 1, _argc - 1) {}
constexpr 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.
@ -81,11 +85,10 @@ public:
bool ParseNext() noexcept;
/**
* Checks if specified string is a command line option.
* Returns the remaining non-option arguments.
*/
static bool IsOption(const char *s) noexcept {
assert(s != nullptr);
return s[0] == '-';
ConstBuffer<const char *> GetRemaining() const noexcept {
return {remaining_head, remaining_tail};
}
};