Something

	size_t size = 0;
	char* line = malloc(size);
	char buf = ' ';
	char* tmp;
	
	while (((buf = fgetc(fp)) != '\n') && buf != EOF) {
		size++;
		tmp = realloc(line, size + 1);
		
		if (tmp == NULL) {
			tmp = malloc(size + 1);
			strcpy(tmp, line);
		}
		
		line = tmp;
		
		line[size - 2] = buf;
	}
	
	if (size >= 1) {
		line[size - 1] = '\0';
	}
	
	return line;
}