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/unhtml-2.3.9/esc.c
Examining data/unhtml-2.3.9/esc.h
Examining data/unhtml-2.3.9/ops.c
Examining data/unhtml-2.3.9/ops.h
Examining data/unhtml-2.3.9/unhtml.c

FINAL RESULTS:

data/unhtml-2.3.9/esc.c:17:8:  [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 bff[MXBF];
data/unhtml-2.3.9/unhtml.c:76:21:  [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).
    if ((inStream = fopen (argv[1], "r")) == NULL) {
data/unhtml-2.3.9/esc.c:23:12:  [1] (buffer) getchar:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
while( (ch=getchar()) != EOF)
data/unhtml-2.3.9/ops.c:146:10:  [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).
   len = strlen(tag) + 1;
data/unhtml-2.3.9/unhtml.c:92:10:  [1] (buffer) fgetc:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
    ch = fgetc (inStream);
data/unhtml-2.3.9/unhtml.c:146:12:  [1] (buffer) fgetc:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
      ch = fgetc (inStream);
data/unhtml-2.3.9/unhtml.c:184:14:  [1] (buffer) fgetc:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
        ch = fgetc (inStream);
data/unhtml-2.3.9/unhtml.c:190:18:  [1] (buffer) fgetc:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
            ch = fgetc (inStream);
data/unhtml-2.3.9/unhtml.c:209:14:  [1] (buffer) fgetc:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
        ch = fgetc (inStream);
data/unhtml-2.3.9/unhtml.c:227:16:  [1] (buffer) fgetc:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
          ch = fgetc (inStream);

ANALYSIS SUMMARY:

Hits = 10
Lines analyzed = 772 in approximately 0.05 seconds (15686 lines/second)
Physical Source Lines of Code (SLOC) = 486
Hits@level = [0]  17 [1]   8 [2]   2 [3]   0 [4]   0 [5]   0
Hits@level+ = [0+]  27 [1+]  10 [2+]   2 [3+]   0 [4+]   0 [5+]   0
Hits/KSLOC@level+ = [0+] 55.5556 [1+] 20.5761 [2+] 4.11523 [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.