progress toward stack trace printing

1 files changed, 21 insertions, 0 deletions

diff --git a/std/endian.zig b/std/endian.zig
new file mode 100644
index 0000000000..dbf518d801
--- /dev/null
+++ b/std/endian.zig
@@ -0,0 +1,21 @@
+pub inline fn swapIfLe(inline T: type, x: T) -> T {
+    swapIf(false, T, x)
+}
+
+pub inline fn swapIfBe(inline T: type, x: T) -> T {
+    swapIf(true, T, x)
+}
+
+pub inline fn swapIf(is_be: bool, inline T: type, x: T) -> T {
+    if (@compileVar("is_big_endian") == is_be) swap(T, x) else x
+}
+
+pub fn swap(inline T: type, x: T) -> T {
+    const x_slice = ([]u8)((&const x)[0...1]);
+    var result: T = undefined;
+    const result_slice = ([]u8)((&result)[0...1]);
+    for (result_slice) |*b, i| {
+        *b = x_slice[@sizeOf(T) - i - 1];
+    }
+    return result;
+}