mirror of https://github.com/bsnes-emu/bsnes.git
102 lines
2.3 KiB
C++
Executable File
102 lines
2.3 KiB
C++
Executable File
#ifndef NALL_ATOI_HPP
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#define NALL_ATOI_HPP
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namespace nall {
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//note: this header is intended to form the base for user-defined literals;
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//once they are supported by GCC. eg:
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//unsigned operator "" b(const char *s) { return binary(s); }
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//-> signed data = 1001b;
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//(0b1001 is nicer, but is not part of the C++ standard)
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constexpr inline uintmax_t binary_(const char *s, uintmax_t sum = 0) {
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return (
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*s == '0' || *s == '1' ? binary_(s + 1, (sum << 1) | *s - '0') :
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sum
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);
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}
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constexpr inline uintmax_t octal_(const char *s, uintmax_t sum = 0) {
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return (
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*s >= '0' && *s <= '7' ? octal_(s + 1, (sum << 3) | *s - '0') :
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sum
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);
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}
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constexpr inline uintmax_t decimal_(const char *s, uintmax_t sum = 0) {
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return (
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*s >= '0' && *s <= '9' ? decimal_(s + 1, (sum * 10) + *s - '0') :
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sum
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);
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}
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constexpr inline uintmax_t hex_(const char *s, uintmax_t sum = 0) {
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return (
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*s >= 'A' && *s <= 'F' ? hex_(s + 1, (sum << 4) | *s - 'A' + 10) :
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*s >= 'a' && *s <= 'f' ? hex_(s + 1, (sum << 4) | *s - 'a' + 10) :
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*s >= '0' && *s <= '9' ? hex_(s + 1, (sum << 4) | *s - '0') :
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sum
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);
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}
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//
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constexpr inline uintmax_t binary(const char *s) {
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return (
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*s == '0' && *(s + 1) == 'B' ? binary_(s + 2) :
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*s == '0' && *(s + 1) == 'b' ? binary_(s + 2) :
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*s == '%' ? binary_(s + 1) :
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binary_(s)
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);
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}
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constexpr inline uintmax_t octal(const char *s) {
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return (
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octal_(s)
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);
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}
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constexpr inline intmax_t integer(const char *s) {
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return (
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*s == '+' ? +decimal_(s + 1) :
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*s == '-' ? -decimal_(s + 1) :
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decimal_(s)
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);
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}
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constexpr inline uintmax_t decimal(const char *s) {
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return (
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decimal_(s)
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);
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}
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constexpr inline uintmax_t hex(const char *s) {
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return (
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*s == '0' && *(s + 1) == 'X' ? hex_(s + 2) :
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*s == '0' && *(s + 1) == 'x' ? hex_(s + 2) :
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*s == '$' ? hex_(s + 1) :
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hex_(s)
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);
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}
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constexpr inline intmax_t numeral(const char *s) {
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return (
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*s == '0' && *(s + 1) == 'X' ? hex_(s + 2) :
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*s == '0' && *(s + 1) == 'x' ? hex_(s + 2) :
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*s == '0' && *(s + 1) == 'B' ? binary_(s + 2) :
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*s == '0' && *(s + 1) == 'b' ? binary_(s + 2) :
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*s == '0' ? octal_(s + 1) :
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*s == '+' ? +decimal_(s + 1) :
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*s == '-' ? -decimal_(s + 1) :
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decimal_(s)
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);
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}
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inline double fp(const char *s) {
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return atof(s);
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}
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}
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#endif
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