Overflow error

bug.c

/*
 * This program shows the typical programming error
 * to handle wrong the signess of a variable.
 *
 * When the variable increases and reaches its maximum
 * value it overflows and became negative.
 *
 *  $ gcc -Wall bug.c -o bug
 *  $ ./bug | head
 *   * sizeof: 2 -> max value: 65536
 *  1
 *  2
 *  3
 *  4
 *  5
 *  6
 *  7
 *  8
 *  9
 *
 * If we look at the program running we see that it doesn't
 * stop:
 *
 *  $ ./bug | grep -C 1 32768
 *  32767
 *  -32768
 *  -32767
 *  --
 *  32767
 *  -32768
 *  -32767
 *  --
 *
 * If the "cycle" variable was used in a "memcpy" then you can see
 * that is a security threat.
 *
 */
#include <stdio.h>

int main() {
    short cycle = 0;
    int size = sizeof(cycle);
    int max_size = 1 << (size*8);

    printf(" * sizeof: %d -> max value: %d\n", size, max_size);

    while (cycle < max_size) {
        printf("%d\n", cycle++);
    }

    return 0;
}