Implement locking

This commit is contained in:
Victor Zverovich
2023-12-25 08:39:14 -08:00
parent c5a85f8d7d
commit e450b7aeb3
2 changed files with 48 additions and 3 deletions

View File

@@ -266,9 +266,20 @@ class file_scan_buffer : public scan_buffer {
public:
explicit file_scan_buffer(FILE* f)
: scan_buffer(nullptr, nullptr, false), file_(f) {
// TODO: lock file?
#ifndef _WIN32
flockfile(f);
#else
_lock_file(f);
#endif
fill();
}
~file_scan_buffer() {
#ifndef _WIN32
funlockfile(file_);
#else
_unlock_file(file_);
#endif
}
};
} // namespace detail
@@ -472,7 +483,6 @@ struct scan_handler : error_handler {
switch (arg_.type) {
case scan_type::int_type:
if (auto value = read_int()) *arg_.int_value = *value;
// TODO: stop on end of input
break;
case scan_type::uint_type:
if (auto value = read_uint()) *arg_.uint_value = *value;
@@ -512,6 +522,11 @@ struct scan_handler : error_handler {
arg_.custom.scan(arg_.custom.value, parse_ctx_, scan_ctx_);
return parse_ctx_.begin();
}
void on_error(const char* message) {
scan_ctx_.advance_to(scan_ctx_.end());
error_handler::on_error(message);
}
};
} // namespace detail
@@ -533,9 +548,10 @@ auto scan(string_view input, string_view fmt, T&... args)
return input.begin() + (buf.begin().base() - input.data());
}
template <typename... T> void scan(std::FILE* f, string_view fmt, T&... args) {
template <typename... T> bool scan(std::FILE* f, string_view fmt, T&... args) {
auto&& buf = detail::file_scan_buffer(f);
vscan(buf, fmt, make_scan_args(args...));
return buf.begin() != buf.end();
}
FMT_END_NAMESPACE