John Andrew Owen mcjohnalds

How to report errors in C

C doesn't support exceptions, but we can store error messages in structs. This document compares 3 different strategies of error reporting.

typedef enum {
    FILE_NOT_FOUND_ERROR,
    INVALID_FILE_FORMAT_ERROR,
    ...

C doesn't support exceptions but GLib has its own error reporting system. It's kind of verbose but it works ok.

Let's pretend we were making a JSON parser library, here's how the error reporting would work. (This example was actually derived from json-glib).

First we create an enum to represent different error codes.

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	<script id="shader-vs" type="x-shader/x-vertex">
	attribute vec2 aPosition;

	void main(void) {
	gl_Position = vec4(aPosition, 0.0, 1.0);
	}
	</script>

	<script id="shader-fs" type="x-shader/x-fragment">
	void main(void) {