Source
pub fn parse(buf: []const u8, port: u16) IPv4ParseError!Ip4Address {
var result: Ip4Address = .{
.sa = .{
.port = mem.nativeToBig(u16, port),
.addr = undefined,
},
};
const out_ptr = mem.asBytes(&result.sa.addr);
var x: u8 = 0;
var index: u8 = 0;
var saw_any_digits = false;
var has_zero_prefix = false;
for (buf) |c| {
if (c == '.') {
if (!saw_any_digits) {
return error.InvalidCharacter;
}
if (index == 3) {
return error.InvalidEnd;
}
out_ptr[index] = x;
index += 1;
x = 0;
saw_any_digits = false;
has_zero_prefix = false;
} else if (c >= '0' and c <= '9') {
if (c == '0' and !saw_any_digits) {
has_zero_prefix = true;
} else if (has_zero_prefix) {
return error.NonCanonical;
}
saw_any_digits = true;
x = try std.math.mul(u8, x, 10);
x = try std.math.add(u8, x, c - '0');
} else {
return error.InvalidCharacter;
}
}
if (index == 3 and saw_any_digits) {
out_ptr[index] = x;
return result;
}
return error.Incomplete;
}