Merge branch 'kristate-std-fmt-hexToBytes'

1 files changed, 20 insertions, 1 deletions

diff --git a/std/fmt/index.zig b/std/fmt/index.zig
index f9b68d7941..80af750f3d 100644
--- a/std/fmt/index.zig
+++ b/std/fmt/index.zig
@@ -350,7 +350,7 @@ pub fn formatText(
             comptime var width = 0;
             if (fmt.len > 1) width = comptime (parseUnsigned(usize, fmt[1..], 10) catch unreachable);
             return formatBuf(bytes, width, context, Errors, output);
-        } else if ((fmt[0] == 'x') or (fmt[0] == 'X') ) {
+        } else if ((fmt[0] == 'x') or (fmt[0] == 'X')) {
             for (bytes) |c| {
                 try formatInt(c, 16, fmt[0] == 'X', 2, context, Errors, output);
             }
@@ -1331,3 +1331,22 @@ pub fn isWhiteSpace(byte: u8) bool {
         else => false,
     };
 }
+
+pub fn hexToBytes(out: []u8, input: []const u8) !void {
+    if (out.len * 2 < input.len)
+        return error.InvalidLength;
+
+    var in_i: usize = 0;
+    while (in_i != input.len) : (in_i += 2) {
+        const hi = try charToDigit(input[in_i], 16);
+        const lo = try charToDigit(input[in_i + 1], 16);
+        out[in_i / 2] = (hi << 4) | lo;
+    }
+}
+
+test "fmt.hexToBytes" {
+    const test_hex_str = "909A312BB12ED1F819B3521AC4C1E896F2160507FFC1C8381E3B07BB16BD1706";
+    var pb: [32]u8 = undefined;
+    try hexToBytes(pb[0..], test_hex_str);
+    try testFmt(test_hex_str, "{X}", pb);
+}