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add fmt.parseInt

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This commit is contained in:
Andrew Kelley 2017-09-26 19:40:51 -04:00
parent 768af66977
commit 224cd8a01e
1 changed files with 20 additions and 0 deletions
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20
std/fmt/index.zig
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@ -364,6 +364,26 @@ fn formatIntCallback(context: &FormatIntBuf, bytes: []const u8) -> bool {
return true;
}
pub fn parseInt(comptime T: type, buf: []const u8, radix: u8) -> %T {
if (!T.is_signed)
return parseUnsigned(T, buf, radix);
if (buf.len == 0)
return T(0);
if (buf[0] == '-') {
return math.negate(%return parseUnsigned(T, buf[1..], radix));
} else if (buf[0] == '+') {
return parseUnsigned(T, buf[1..], radix);
} else {
return parseUnsigned(T, buf, radix);
}
}
test "fmt.parseInt" {
assert(%%parseInt(i32, "-10", 10) == -10);
assert(%%parseInt(i32, "+10", 10) == 10);
assert(if (parseInt(i32, " 10", 10)) |_| false else |err| err == error.InvalidChar);
}
pub fn parseUnsigned(comptime T: type, buf: []const u8, radix: u8) -> %T {
var x: T = 0;