diff options
Diffstat (limited to 'libc/src/__support/integer_literals.h')
| -rw-r--r-- | libc/src/__support/integer_literals.h | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/libc/src/__support/integer_literals.h b/libc/src/__support/integer_literals.h index de1f88fbd3f3..e99799c3512e 100644 --- a/libc/src/__support/integer_literals.h +++ b/libc/src/__support/integer_literals.h @@ -151,12 +151,15 @@ template <size_t N> struct Parser<LIBC_NAMESPACE::UInt<N>> { template <typename T> LIBC_INLINE constexpr T parse_with_prefix(const char *ptr) { using P = Parser<T>; - if (ptr[0] == '0' && ptr[1] == 'x') - return P::template parse<16>(ptr + 2); - else if (ptr[0] == '0' && ptr[1] == 'b') - return P::template parse<2>(ptr + 2); - else - return P::template parse<10>(ptr); + if (ptr == nullptr) + return T(); + if (ptr[0] == '0') { + if (ptr[1] == 'b') + return P::template parse<2>(ptr + 2); + if (ptr[1] == 'x') + return P::template parse<16>(ptr + 2); + } + return P::template parse<10>(ptr); } } // namespace internal @@ -169,6 +172,16 @@ LIBC_INLINE constexpr auto operator""_u256(const char *x) { return internal::parse_with_prefix<UInt<256>>(x); } +template <typename T> LIBC_INLINE constexpr T parse_bigint(const char *ptr) { + if (ptr == nullptr) + return T(); + if (ptr[0] == '-' || ptr[0] == '+') { + auto positive = internal::parse_with_prefix<T>(ptr + 1); + return ptr[0] == '-' ? -positive : positive; + } + return internal::parse_with_prefix<T>(ptr); +} + } // namespace LIBC_NAMESPACE #endif // LLVM_LIBC_SRC___SUPPORT_INTEGER_LITERALS_H |