slhx agent
37 lines
1.4 KiB
Zig
37 lines
1.4 KiB
Zig
const std = @import("std");
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/// Materialize terminal control characters as visible glyphs for failure output.
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/// This is test/debug support only: product rendering still writes real CR/LF/ESC.
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pub fn visibleControlsAlloc(allocator: std.mem.Allocator, bytes: []const u8) ![]u8 {
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var out = std.ArrayList(u8).empty;
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errdefer out.deinit(allocator);
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for (bytes) |byte| switch (byte) {
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'\r' => try out.appendSlice(allocator, "␍"),
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'\n' => try out.appendSlice(allocator, "␊\n"),
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0x1b => try out.appendSlice(allocator, "␛"),
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'\t' => try out.appendSlice(allocator, "⇥"),
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else => if (byte < 0x20) {
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try out.appendSlice(allocator, "␀");
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} else try out.append(allocator, byte),
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};
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return out.toOwnedSlice(allocator);
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}
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pub fn hasBareLf(bytes: []const u8) bool {
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for (bytes, 0..) |byte, i| {
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if (byte == '\n' and (i == 0 or bytes[i - 1] != '\r')) return true;
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}
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return false;
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}
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test "regular: visible terminal controls expose newline and escape bytes" {
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const debug = try visibleControlsAlloc(std.testing.allocator, "a\nb\r\n\x1b[31m");
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defer std.testing.allocator.free(debug);
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try std.testing.expectEqualStrings("a␊\nb␍␊\n␛[31m", debug);
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}
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test "adversarial: bare LF detector catches raw-mode skew risk" {
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try std.testing.expect(hasBareLf("a\nb"));
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try std.testing.expect(!hasBareLf("a\r\nb"));
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}
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