Flawfinder version 2.0.10, (C) 2001-2019 David A. Wheeler.
Number of rules (primarily dangerous function names) in C/C++ ruleset: 223
Examining data/xcape-1.2/xcape.c

FINAL RESULTS:

data/xcape-1.2/xcape.c:113:18:  [3] (buffer) getopt:
  Some older implementations do not protect against internal buffer overflows
  (CWE-120, CWE-20). Check implementation on installation, or limit the size
  of all string inputs.
    while ((ch = getopt (argc, argv, "de:t:")) != -1)
data/xcape-1.2/xcape.c:125:26:  [2] (integer) atoi:
  Unless checked, the resulting number can exceed the expected range
  (CWE-190). If source untrusted, check both minimum and maximum, even if the
  input had no minus sign (large numbers can roll over into negative number;
  consider saving to an unsigned value if that is intended).
                int ms = atoi (optarg);

ANALYSIS SUMMARY:

Hits = 2
Lines analyzed = 575 in approximately 0.02 seconds (25173 lines/second)
Physical Source Lines of Code (SLOC) = 455
Hits@level = [0]  30 [1]   0 [2]   1 [3]   1 [4]   0 [5]   0
Hits@level+ = [0+]  32 [1+]   2 [2+]   2 [3+]   1 [4+]   0 [5+]   0
Hits/KSLOC@level+ = [0+] 70.3297 [1+] 4.3956 [2+] 4.3956 [3+] 2.1978 [4+]   0 [5+]   0
Dot directories skipped = 1 (--followdotdir overrides)
Minimum risk level = 1
Not every hit is necessarily a security vulnerability.
There may be other security vulnerabilities; review your code!
See 'Secure Programming HOWTO'
(https://dwheeler.com/secure-programs) for more information.