Add unsigned and signed generic print fns

Signed-off-by: Andrew Kelley <superjoe30@gmail.com>

1 files changed, 9 insertions, 4 deletions

diff --git a/std/io.zig b/std/io.zig
index be4320ad31..432600ee04 100644
--- a/std/io.zig
+++ b/std/io.zig
@@ -248,16 +248,19 @@ fn char_to_digit(c: u8) -> u8 {
     }
 }
 
-pub fn buf_print_i64(out_buf: []u8, x: i64) -> isize {
+pub fn buf_print_signed(T: type)(out_buf: []u8, x: T) -> isize {
+    const uint = @int_type(false, T.bit_count, false);
     if (x < 0) {
         out_buf[0] = '-';
-        return 1 + buf_print_u64(out_buf[1...], u64(-(x + 1)) + 1);
+        return 1 + buf_print_unsigned(uint)(out_buf[1...], uint(-(x + 1)) + 1);
     } else {
-        return buf_print_u64(out_buf, u64(x));
+        return buf_print_unsigned(uint)(out_buf, uint(x));
     }
 }
 
-pub fn buf_print_u64(out_buf: []u8, x: u64) -> isize {
+pub const buf_print_i64 = buf_print_signed(i64);
+
+pub fn buf_print_unsigned(T: type)(out_buf: []u8, x: T) -> isize {
     var buf: [max_u64_base10_digits]u8 = undefined;
     var a = x;
     var index: isize = buf.len;
@@ -278,6 +281,8 @@ pub fn buf_print_u64(out_buf: []u8, x: u64) -> isize {
     return len;
 }
 
+pub const buf_print_u64 = buf_print_unsigned(u64);
+
 pub fn buf_print_f64(out_buf: []u8, x: f64, decimals: isize) -> isize {
     const numExpBits = 11;
     const numRawSigBits = 52; // not including implicit 1 bit