Question

char *getInput2(char *param) {
    int data_len;
    data_len=atoi(getenv("CONTENT_LENGTH"));
    char input[9];
    fgets(input, 9, stdin);

    return strdup (input+6);

}

and

char *getInput2(char *param) {

    char input[9];
    fgets(input, 9, stdin);

    return strdup (input+6);

}

why the ouptut of above functons are different?

for example the post value is
max_n=20

first functions output:”x_n”
second functions output:”20″

Answer 1

This functions is same, first getInput2 doing something more but result of this calculations is not usable in future instructions.

But when CONTENT_LENGHT not exists then you atoi gets NULL and her code was stop from Debug Assertion.

/* validation section */
if (endptr != NULL)
{
    /* store beginning of string in endptr */
    *endptr = (char *)nptr;
}
_VALIDATE_RETURN(nptr != NULL, EINVAL, 0L);
_VALIDATE_RETURN(ibase == 0 || (2 <= ibase && ibase <= 36), EINVAL, 0L);