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Mini Shell
Mini Shell
/* Generated by re2c */
// re2c $INPUT -o $OUTPUT -ci
#include <stdint.h>
#include <limits.h>
#include <assert.h>
static const uint64_t ERROR = UINT64_MAX;
enum YYCONDTYPE {
yycinit,
yycbin,
yycdec,
yychex,
yycoct,
};
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;
{
char yych;
switch (c) {
case yycinit: goto yyc_init;
case yycbin: goto yyc_bin;
case yycdec: goto yyc_dec;
case yychex: goto yyc_hex;
case yycoct: goto yyc_oct;
}
/* *********************************** */
yyc_init:
yych = *YYCURSOR;
switch (yych) {
case '0': goto yy2;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': goto yy4;
default: goto yy1;
}
yy1:
++YYCURSOR;
{ return ERROR; }
yy2:
yych = *(YYMARKER = ++YYCURSOR);
switch (yych) {
case 'B':
case 'b': goto yy5;
case 'X':
case 'x': goto yy7;
default: goto yy3;
}
yy3:
c = yycoct;
goto yyc_oct;
yy4:
++YYCURSOR;
YYCURSOR -= 1;
c = yycdec;
goto yyc_dec;
yy5:
yych = *++YYCURSOR;
switch (yych) {
case '0':
case '1': goto yy8;
default: goto yy6;
}
yy6:
YYCURSOR = YYMARKER;
goto yy3;
yy7:
yych = *++YYCURSOR;
switch (yych) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f': goto yy9;
default: goto yy6;
}
yy8:
++YYCURSOR;
YYCURSOR -= 1;
c = yycbin;
goto yyc_bin;
yy9:
++YYCURSOR;
YYCURSOR -= 1;
c = yychex;
goto yyc_hex;
/* *********************************** */
yyc_bin:
yych = *YYCURSOR;
switch (yych) {
case 0x00: goto yy11;
case '0':
case '1': goto yy13;
default: goto yy12;
}
yy11:
++YYCURSOR;
{ return u; }
yy12:
++YYCURSOR;
{ return ERROR; }
yy13:
++YYCURSOR;
{ add<2>(u, YYCURSOR[-1] - '0'); goto yyc_bin; }
/* *********************************** */
yyc_dec:
yych = *YYCURSOR;
switch (yych) {
case 0x00: goto yy15;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': goto yy17;
default: goto yy16;
}
yy15:
++YYCURSOR;
{ return u; }
yy16:
++YYCURSOR;
{ return ERROR; }
yy17:
++YYCURSOR;
{ add<10>(u, YYCURSOR[-1] - '0'); goto yyc_dec; }
/* *********************************** */
yyc_hex:
yych = *YYCURSOR;
switch (yych) {
case 0x00: goto yy19;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9': goto yy21;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F': goto yy22;
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f': goto yy23;
default: goto yy20;
}
yy19:
++YYCURSOR;
{ return u; }
yy20:
++YYCURSOR;
{ return ERROR; }
yy21:
++YYCURSOR;
{ add<16>(u, YYCURSOR[-1] - '0'); goto yyc_hex; }
yy22:
++YYCURSOR;
{ add<16>(u, YYCURSOR[-1] - 'A' + 10); goto yyc_hex; }
yy23:
++YYCURSOR;
{ add<16>(u, YYCURSOR[-1] - 'a' + 10); goto yyc_hex; }
/* *********************************** */
yyc_oct:
yych = *YYCURSOR;
switch (yych) {
case 0x00: goto yy25;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7': goto yy27;
default: goto yy26;
}
yy25:
++YYCURSOR;
{ return u; }
yy26:
++YYCURSOR;
{ return ERROR; }
yy27:
++YYCURSOR;
{ add<8>(u, YYCURSOR[-1] - '0'); goto yyc_oct; }
}
}
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;
}
Zerion Mini Shell 1.0