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// re2c $INPUT -o $OUTPUT -ci
#include <stdint.h>
#include <limits.h>
#include <assert.h>
static const uint64_t ERROR = UINT64_MAX;
/*!conditions:re2c*/
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;
int c = yycinit;
uint64_t u = 0;
/*!re2c
re2c:api:style = free-form;
re2c:define:YYCTYPE = char;
re2c:define:YYGETCONDITION = "c";
re2c:define:YYSETCONDITION = "c = @@;";
re2c:yyfill:enable = 0;
<*> * { return ERROR; }
<init> '0b' / [01] :=> bin
<init> "0" :=> oct
<init> "" / [1-9] :=> dec
<init> '0x' / [0-9a-fA-F] :=> hex
<bin, oct, dec, hex> "\x00" { return u; }
<bin> [01] { add<2>(u, YYCURSOR[-1] - '0'); goto yyc_bin; }
<oct> [0-7] { add<8>(u, YYCURSOR[-1] - '0'); goto yyc_oct; }
<dec> [0-9] { add<10>(u, YYCURSOR[-1] - '0'); goto yyc_dec; }
<hex> [0-9] { add<16>(u, YYCURSOR[-1] - '0'); goto yyc_hex; }
<hex> [a-f] { add<16>(u, YYCURSOR[-1] - 'a' + 10); goto yyc_hex; }
<hex> [A-F] { add<16>(u, YYCURSOR[-1] - 'A' + 10); goto yyc_hex; }
*/
}
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;
}