If you still need to find line breaks, you could search for the appropiate line break control characters (CR & LF) in your STRING:

Code:
char *char_array = your_string->chars;
int i;
	
for (i = 0; char_array[i]; i++)
{
	if ((char_array[i] == 13) && (char_array[i + 1] == 10))
	{
		printf("line break found at position %i", i + 1);
		i++;
	}
}