std/fmt/index.zig: #1358 allow bytes to be printed-out as hex;

Supports {x} for lowercase and {X} for uppercase;

1 files changed, 5 insertions, 0 deletions

diff --git a/std/fmt/index.zig b/std/fmt/index.zig
index 6d23eebd0b..a8ea5b4c5a 100644
--- a/std/fmt/index.zig
+++ b/std/fmt/index.zig
@@ -350,6 +350,11 @@ 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') ) {
+            for (bytes) |c| {
+                try formatInt(c, 16, fmt[0] == 'X', 0, context, Errors, output);
+            }
+            return;
         } else @compileError("Unknown format character: " ++ []u8{fmt[0]});
     }
     return output(context, bytes);