char *explain_fgets_or_die(char *data, int data_size, FILE *fp);
DESCRIPTION
The explain_fgets_or_die function
is used to call the fgets(3) system
call. On failure an explanation will be
printed to stderr,
obtained from explain_fgets(3),
and then the process terminates
by calling exit(EXIT_FAILURE).
This function is intended to be used in a fashion
similar to the following example:
explain_fgets_or_die(data, data_size, fp);
data
The data, exactly as to be passed to the fgets(3) system call.
data_size
The data_size, exactly as to be passed to the fgets(3) system call.
fp
The fp, exactly as to be passed to the fgets(3) system call.
Returns:
This function only returns on success;
data when a line is read, or NULL on end-of-file.
On failure, prints an explanation and exits.