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fix zero flag for char types and make zero flag ignored if a precision is specified

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This commit is contained in:
rimathia 2020-05-23 17:21:32 +02:00 committed by Victor Zverovich
parent bc1b89da26
commit 8c8f74a870
2 changed files with 9 additions and 1 deletions
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5
include/fmt/printf.h
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@ -257,6 +257,7 @@ class printf_arg_formatter : public detail::arg_formatter_base<Range> {
return (*this)(static_cast<int>(value));
fmt_specs.sign = sign::none;
fmt_specs.alt = false;
fmt_specs.fill[0] = ' '; // Ignore '0' flag for char types.
// align::numeric needs to be overwritten here since the '0' flag is
// ignored for non-numeric types
if (fmt_specs.align == align::none || fmt_specs.align == align::numeric)
@ -508,6 +509,10 @@ OutputIt basic_printf_context<OutputIt, Char>::format() {
}
format_arg arg = get_arg(arg_index);
// For d, i, o, u, x, and X conversion specifiers, if a precision is
// specified, the '0' flag is ignored
if (specs.precision >= 0 && arg.is_integral())
specs.fill[0] = ' '; // Ignore '0' flag for non-numeric types or if '-' present.
if (specs.precision >= 0 && arg.type() == detail::type::cstring_type) {
auto str = visit_format_arg(detail::get_cstring<Char>(), arg);
auto str_end = str + specs.precision;

5
test/printf-test.cc
View File

@ -139,8 +139,11 @@ TEST(PrintfTest, ZeroFlag) {
EXPECT_PRINTF("+00042", "%00+6d", 42);
EXPECT_PRINTF(" 42", "%05.d", 42);
EXPECT_PRINTF(" 0042", "%05.4d", 42);
// '0' flag is ignored for non-numeric types.
EXPECT_PRINTF("0000x", "%05c", 'x');
EXPECT_PRINTF(" x", "%05c", 'x');
}
TEST(PrintfTest, PlusFlag) {