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Make ubsan happy on empty format specs (#2175)

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This commit is contained in:
Victor Zverovich
2021-03-12 09:13:47 -08:00
parent af567538a0
commit 8f9db3fcb8
1 changed files with 3 additions and 1 deletions
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4
include/fmt/format.h
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@ -3525,11 +3525,13 @@ struct formatter<T, Char,
// terminating '}'. // terminating '}'.
template <typename ParseContext> template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) { FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
auto begin = ctx.begin(), end = ctx.end();
if (begin == end) return begin;
using handler_type = detail::dynamic_specs_handler<ParseContext>; using handler_type = detail::dynamic_specs_handler<ParseContext>;
auto type = detail::type_constant<T, Char>::value; auto type = detail::type_constant<T, Char>::value;
detail::specs_checker<handler_type> handler(handler_type(specs_, ctx), detail::specs_checker<handler_type> handler(handler_type(specs_, ctx),
type); type);
auto it = parse_format_specs(ctx.begin(), ctx.end(), handler); auto it = parse_format_specs(begin, end, handler);
auto eh = ctx.error_handler(); auto eh = ctx.error_handler();
switch (type) { switch (type) {
case detail::type::none_type: case detail::type::none_type: