Function getCwdAlloc [src]

Caller must free the returned memory. On Windows, the result is encoded as WTF-8. On other platforms, the result is an opaque sequence of bytes with no particular encoding.

Prototype

pub fn getCwdAlloc(allocator: Allocator) ![]u8

Parameters

allocator: Allocator

Example

 test getCwdAlloc {
    if (native_os == .wasi) return error.SkipZigTest;

    const cwd = try getCwdAlloc(testing.allocator);
    testing.allocator.free(cwd);
}

Source

  pub fn getCwdAlloc(allocator: Allocator) ![]u8 {
    // The use of max_path_bytes here is just a heuristic: most paths will fit
    // in stack_buf, avoiding an extra allocation in the common case.
    var stack_buf: [fs.max_path_bytes]u8 = undefined;
    var heap_buf: ?[]u8 = null;
    defer if (heap_buf) |buf| allocator.free(buf);

    var current_buf: []u8 = &stack_buf;
    while (true) {
        if (posix.getcwd(current_buf)) |slice| {
            return allocator.dupe(u8, slice);
        } else |err| switch (err) {
            error.NameTooLong => {
                // The path is too long to fit in stack_buf. Allocate geometrically
                // increasing buffers until we find one that works
                const new_capacity = current_buf.len * 2;
                if (heap_buf) |buf| allocator.free(buf);
                current_buf = try allocator.alloc(u8, new_capacity);
                heap_buf = current_buf;
            },
            else => |e| return e,
        }
    }
}  