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Fix strVal to handle pointer-to-array types correctly

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- For pointer-to-array (*[N]u8), explicitly slice using @ptrCast
- Prevents returning dangling pointer to stack memory
This commit is contained in:
Ankit Patial
2026-01-22 11:13:43 +05:30
parent 654b45ee10
commit 0f2f19f9b1
1 changed files with 19 additions and 5 deletions
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24
src/build_templates.zig
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@@ -198,12 +198,26 @@ fn generateSingleFile(
\\
\\fn strVal(v: anytype) []const u8 {
\\ const T = @TypeOf(v);
\\ return switch (@typeInfo(T)) {
\\ .pointer => |p| if (p.size == .slice) v else @compileError("unsupported pointer type"),
\\ .int, .comptime_int => std.fmt.bufPrint(&int_buf, "{d}", .{v}) catch "0",
\\ .optional => if (v) |val| strVal(val) else "",
\\ switch (@typeInfo(T)) {
\\ .pointer => |p| switch (p.size) {
\\ .slice => return v,
\\ .one => {
\\ // For pointer-to-array, slice it
\\ const child_info = @typeInfo(p.child);
\\ if (child_info == .array) {
\\ const arr_info = child_info.array;
\\ const ptr: [*]const arr_info.child = @ptrCast(v);
\\ return ptr[0..arr_info.len];
\\ }
\\ return strVal(v.*);
\\ },
\\ else => @compileError("unsupported pointer type"),
\\ },
\\ .array => @compileError("arrays must be passed by pointer"),
\\ .int, .comptime_int => return std.fmt.bufPrint(&int_buf, "{d}", .{v}) catch "0",
\\ .optional => return if (v) |val| strVal(val) else "",
\\ else => @compileError("strVal: unsupported type " ++ @typeName(T)),
\\ };
\\ }
\\}
\\
\\// ─────────────────────────────────────────────────────────────────────────────