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// re2c $INPUT -o $OUTPUT -i #include <stdint.h> #include <limits.h> #include <assert.h> static const uint64_t ERROR = UINT64_MAX; template<int BASE> static void add(uint64_t &u, char d) { u = u * BASE + d; if (u > UINT32_MAX) u = ERROR; } static uint64_t parse_u32(const char *s) { const char *YYCURSOR = s, *YYMARKER; uint64_t u = 0; /*!re2c re2c:yyfill:enable = 0; re2c:define:YYCTYPE = char; end = "\x00"; '0b' / [01] { goto bin; } "0" { goto oct; } "" / [1-9] { goto dec; } '0x' / [0-9a-fA-F] { goto hex; } * { return ERROR; } */ bin: /*!re2c end { return u; } [01] { add<2>(u, YYCURSOR[-1] - '0'); goto bin; } * { return ERROR; } */ oct: /*!re2c end { return u; } [0-7] { add<8>(u, YYCURSOR[-1] - '0'); goto oct; } * { return ERROR; } */ dec: /*!re2c end { return u; } [0-9] { add<10>(u, YYCURSOR[-1] - '0'); goto dec; } * { return ERROR; } */ hex: /*!re2c end { return u; } [0-9] { add<16>(u, YYCURSOR[-1] - '0'); goto hex; } [a-f] { add<16>(u, YYCURSOR[-1] - 'a' + 10); goto hex; } [A-F] { add<16>(u, YYCURSOR[-1] - 'A' + 10); goto hex; } * { return ERROR; } */ } int main() { assert(parse_u32("") == ERROR); assert(parse_u32("1234567890") == 1234567890); assert(parse_u32("0b1101") == 13); assert(parse_u32("0x7Fe") == 2046); assert(parse_u32("0644") == 420); assert(parse_u32("9999999999") == ERROR); return 0; }