Reading stream char by char

Reading stream char by char

I'm using this function to read, char by char, a text file or a stdin input
void readLine(FILE *stream, char **string) {
char c;
int counter = 0;
do {
c = fgetc(stream);
string[0] = (char *) realloc (string[0], (counter+1) * sizeof(char));
string[0][counter++] = c;
} while(c != ENTER && !feof(stream));
string[counter-1] = '\0';
}
But when I call it, my program crashed and I really don't know why,
because I don't forget the 0-terminator and I'm convinced that I stored
correctly the char sequence. I've verified the string length, but it
appears alright.