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Improve handling of char in printf.

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This commit is contained in:
Victor Zverovich 2014-08-19 08:14:21 -07:00
parent f2be7851cc
commit c4a4a05d12
2 changed files with 35 additions and 4 deletions
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30
format.cc
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@ -270,6 +270,21 @@ class ArgConverter : public fmt::internal::ArgVisitor<ArgConverter<T>, void> {
}
};
// Converts an integer argument to char.
class CharConverter : public fmt::internal::ArgVisitor<CharConverter, void> {
private:
fmt::internal::Arg &arg_;
public:
explicit CharConverter(fmt::internal::Arg &arg) : arg_(arg) {}
template <typename T>
void visit_any_int(T value) {
arg_.type = Arg::CHAR;
arg_.int_value = static_cast<char>(value);
}
};
// This function template is used to prevent compile errors when handling
// incompatible string arguments, e.g. handling a wide string in a narrow
// string formatter.
@ -954,7 +969,8 @@ void fmt::internal::PrintfFormatter<Char>::format(
ArgConverter<ptrdiff_t>(arg, *s).visit(arg);
break;
case 'L':
// TODO: handle length
// printf produces garbage when 'L' is omitted for long double, no
// need to do the same.
break;
default:
--s;
@ -966,9 +982,17 @@ void fmt::internal::PrintfFormatter<Char>::format(
if (error_)
throw FormatError(error_);
spec.type_ = static_cast<char>(*s++);
if (arg.type <= Arg::LAST_INTEGER_TYPE &&
(spec.type_ == 'i' || spec.type_ == 'u')) {
if (arg.type <= Arg::LAST_INTEGER_TYPE) {
// Normalize type.
switch (spec.type_) {
case 'i': case 'u':
spec.type_ = 'd';
break;
case 'c':
// TODO: handle wchar_t
CharConverter(arg).visit(arg);
break;
}
}
start = s;

9
test/printf-test.cc
View File

@ -368,7 +368,14 @@ TEST(PrintfTest, Length) {
long double max = std::numeric_limits<long double>::max();
EXPECT_PRINTF(fmt::format("{}", max), "%g", max);
EXPECT_PRINTF(fmt::format("{}", max), "%Lg", max);
// TODO: test char, string
}
TEST(PrintfTest, Char) {
EXPECT_PRINTF("x", "%c", 'x');
int max = std::numeric_limits<int>::max();
EXPECT_PRINTF(fmt::format("{}", static_cast<char>(max)), "%c", max);
// TODO: test wchar_t
}
// TODO: test type specifier
// TODO: test char, string