[aclug-L] Weekly C quiz

[Larry Bottorff <mrprenzl@xxxxxxxxxx>]

Here's the next installment of Larry's Weekly C Quiz. This week we're
looking at buffer overruns. Here's some code:

#define MAX_BUF 201
...
char buffer[MAX_BUF];
FILE *file_in;
...
while (fgets(buffer, sizeof(buffer), file_in) != NULL) {
....
}


If fgets returns a line from file_in's file bigger than MAX_BUF, buffer
is full at the maximun size, the rest not going into buffer: good. But
then the next fgets seems to fill buffer with the leftover from the
input file's last line. How can I "flush" fgets so a longer line's
leftover doesn't show up in the next fgets?

Larry

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