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/aa3d-1.0/aa3d.c

FINAL RESULTS:

data/aa3d-1.0/aa3d.c:25:8:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
static char data[65536 / 2];
data/aa3d-1.0/aa3d.c:38:14:  [2] (integer) atol:
  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).
	    width = atol(argv[s + 1]), s++;
data/aa3d-1.0/aa3d.c:40:13:  [2] (integer) atol:
  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).
	    skip = atol(argv[s + 1]), s++;
data/aa3d-1.0/aa3d.c:44:10:  [2] (misc) fopen:
  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).
	    f = fopen(argv[s + 1], "r");
data/aa3d-1.0/aa3d.c:76:16:  [1] (buffer) getc:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
		    letter = getc(f);
data/aa3d-1.0/aa3d.c:84:7:  [1] (buffer) getc:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
		s = getc(stdin);
data/aa3d-1.0/aa3d.c:98:54:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
		s = string == NULL ? letter : string[(x + shift) % strlen(string)];
data/aa3d-1.0/aa3d.c:107:10:  [1] (buffer) getc:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
	    s = getc(stdin);
data/aa3d-1.0/aa3d.c:111:7:  [1] (buffer) getc:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
		s = getc(f);

ANALYSIS SUMMARY:

Hits = 9
Lines analyzed = 114 in approximately 0.01 seconds (9033 lines/second)
Physical Source Lines of Code (SLOC) = 92
Hits@level = [0]   2 [1]   5 [2]   4 [3]   0 [4]   0 [5]   0
Hits@level+ = [0+]  11 [1+]   9 [2+]   4 [3+]   0 [4+]   0 [5+]   0
Hits/KSLOC@level+ = [0+] 119.565 [1+] 97.8261 [2+] 43.4783 [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.