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/dirdiff-2.1/filecmp.c

FINAL RESULTS:

data/dirdiff-2.1/filecmp.c:19:26:  [2] (buffer) bcopy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
#define memmove(t, f, n)	bcopy(f, t, n)
data/dirdiff-2.1/filecmp.c:270:15:  [2] (misc) open:
  Check when opening files - can an attacker redirect it (via symlinks),
  force the opening of special file type (e.g., device files), move things
  around to create a race condition, control its ancestors, or change its
  contents? (CWE-362).
    if ((f1 = open(argv[fi], O_RDONLY)) == -1) {
data/dirdiff-2.1/filecmp.c:275:15:  [2] (misc) open:
  Check when opening files - can an attacker redirect it (via symlinks),
  force the opening of special file type (e.g., device files), move things
  around to create a race condition, control its ancestors, or change its
  contents? (CWE-362).
    if ((f2 = open(argv[fi+1], O_RDONLY)) == -1) {
data/dirdiff-2.1/filecmp.c:344:5:  [2] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf. Risk is low because the source has a constant maximum length.
    sprintf(interp->result, "%d", same);
data/dirdiff-2.1/filecmp.c:293:11:  [1] (buffer) read:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
	    n1 = read(f1, b1 + k1, BSIZE - k1);
data/dirdiff-2.1/filecmp.c:305:11:  [1] (buffer) read:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
	    n2 = read(f2, b2 + k2, BSIZE - k2);

ANALYSIS SUMMARY:

Hits = 6
Lines analyzed = 354 in approximately 0.04 seconds (9727 lines/second)
Physical Source Lines of Code (SLOC) = 305
Hits@level = [0]   0 [1]   2 [2]   4 [3]   0 [4]   0 [5]   0
Hits@level+ = [0+]   6 [1+]   6 [2+]   4 [3+]   0 [4+]   0 [5+]   0
Hits/KSLOC@level+ = [0+] 19.6721 [1+] 19.6721 [2+] 13.1148 [3+]   0 [4+]   0 [5+]   0
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.