Zig 0.17.0-dev (Split by item)

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parseScientific

Parse the scientific notation component of a float.

parse.parseScientific

fn parseScientific(stream: *FloatStream) ?i64

File

lib/std/fmt/parse_float/parse.zig:69

Code

fn parseScientific(stream: *FloatStream) ?i64 {
    var exponent: i64 = 0;
    var negative = false;

    if (stream.first()) |c| {
        negative = c == '-';
        if (c == '-' or c == '+') {
            stream.advance(1);
        }
    }
    if (stream.firstIsDigit(10)) {
        while (stream.scanDigit(10)) |digit| {
            // no overflows here, saturate well before overflow
            if (exponent < 0x1000_0000) {
                exponent = 10 * exponent + digit;
            }
        }

        return if (negative) -exponent else exponent;
    }

    return null;
}