What happens to return string pointer from file handler

[OsakiTsukiko]

I am using webui-zig and the signature for the file handler is fn my_files_handler(filename: []const u8) ?[]u8 and it seems to not be freed. Why is the return value not freed afterward? There is little purpose in having a filehandle that only returns static strings. Also, I can not see how this works in C, wouldn't local variables go out of scope? How do you send a char pointer to a locally defined variable?

[hassandraga]

Thank you for pointing this out. It seems the Zig example is missing some important comments. I will update it soon.

However, if you allocate memory using webui.malloc() then webui will take care of freeing this memory after sending data to the browser. You can check this C example's comments.

Zig Example:

fn my_files_handler(filename: []const u8) ?[]const u8 {
        const buffer = webui.malloc(1024 * 4);
        return buffer; // WebUI will automatically free buffer
}

[hassandraga]

Added (webui-dev/zig-webui@c571a0b).

[OsakiTsukiko]

oh, that's nice, thanks!