ini parser

ini.h

struct INIState {
	char *buffer, *section, *key, *value;
	size_t bytes, sectionBytes, keyBytes, valueBytes;
};

bool INIParse(INIState *s) {
#define INI_READ(destination, counter, c1, c2) \
	s->destination = s->buffer, s->counter = 0; \
	while (s->bytes && *s->buffer != c1 && *s->buffer != c2) s->counter++, s->buffer++, s->bytes--; \
	if (s->bytes && *s->buffer == c1) s->buffer++, s->bytes--;

	while (s->bytes) {
		char c = *s->buffer;

		if (c == ' ' || c == '\n' || c == '\r') { 
			s->buffer++, s->bytes--; 
			continue;
		} else if (c == ';') {
			s->valueBytes = 0;
			INI_READ(key, keyBytes, '\n', 0);
		} else if (c == '[') {
			s->keyBytes = s->valueBytes = 0;
			s->buffer++, s->bytes--;
			INI_READ(section, sectionBytes, ']', 0);
		} else {
			INI_READ(key, keyBytes, '=', '\n');
			INI_READ(value, valueBytes, '\n', 0);
		}

		// Optional! Zero terminate the output strings.
		if (s->sectionBytes) s->section[s->sectionBytes] = 0; else s->section = &emptyS
		if (s->keyBytes) s->key[s->keyBytes] = 0; else s->key = &emptyString;
		if (s->valueBytes) s->value[s->valueBytes] = 0; else s->value = &emptyString;

		return true;
	}

	return false;
}