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/ruby-fast-xs-0.8.0/ext/fast_xs/gcc.h
Examining data/ruby-fast-xs-0.8.0/ext/fast_xs/fast_xs_type.h
Examining data/ruby-fast-xs-0.8.0/ext/fast_xs/ruby_1_9_compat.h
Examining data/ruby-fast-xs-0.8.0/ext/fast_xs/fast_xs.c
Examining data/ruby-fast-xs-0.8.0/ext/fast_xs_extra/fast_xs_extra.c

FINAL RESULTS:

data/ruby-fast-xs-0.8.0/ext/fast_xs/fast_xs.c:76:2:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
	memcpy(buf, x, sizeof(x) - 1); \
data/ruby-fast-xs-0.8.0/ext/fast_xs_extra/fast_xs_extra.c:8:16:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
	buf = (char *)memcpy(buf, x, sizeof(x) - 1) + sizeof(x) - 1; \

ANALYSIS SUMMARY:

Hits = 2
Lines analyzed = 423 in approximately 0.04 seconds (10055 lines/second)
Physical Source Lines of Code (SLOC) = 337
Hits@level = [0]   0 [1]   0 [2]   2 [3]   0 [4]   0 [5]   0
Hits@level+ = [0+]   2 [1+]   2 [2+]   2 [3+]   0 [4+]   0 [5+]   0
Hits/KSLOC@level+ = [0+] 5.93472 [1+] 5.93472 [2+] 5.93472 [3+]   0 [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.