hex-to-number
gweimer/utils/hex-to-number
Convert a hex string (with leading 0x) into a number. A negative output indicates position of error on invalid input string.
hex-to-number
@/hex-to-number
Convert a hex string (with leading 0x) into a number. A negative output indicates position of error on invalid input string.
HEXstring
DECnumber
C++ implementation
struct State {
};
{{ GENERATED_CODE }}
void evaluate(Context ctx) {
auto hex = getValue<input_HEX>(ctx);
char valid[] = "0123456789ABCDEFabcdef";
int error = 0;
int i = 0; // Index for position in string
for (auto it = hex->iterate(); !error && it; ++it) {
i++;
if (i == 1) {
(char)*it == '0' || (error = -i);
} else if (i == 2) {
(char)*it == 'x' || (error = -i);
} else if (strchr(valid, (char)*it) == NULL) {
error = -i;
}
}
int dec;
if (error) {
dec = error;
} else {
char hexBuff[length(hex)+1] = { 0 }; // init with terminal zeros
dump(hex, hexBuff);
sscanf(hexBuff, "0x%x", &dec);
}
emitValue<output_DEC>(ctx, dec);
}