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/simhash-0.0.20161225/crc.h
Examining data/simhash-0.0.20161225/simhash.c
Examining data/simhash-0.0.20161225/crc32.c
Examining data/simhash-0.0.20161225/heap.h
Examining data/simhash-0.0.20161225/hash.c
Examining data/simhash-0.0.20161225/hash.h
Examining data/simhash-0.0.20161225/heap.c

FINAL RESULTS:

data/simhash-0.0.20161225/simhash.c:206:2:  [4] (buffer) strcat:
  Does not check for buffer overflows when concatenating to destination
  [MS-banned] (CWE-120). Consider using strcat_s, strncat, strlcat, or
  snprintf (warning: strncat is easily misused).
	strcat(nambuf, SUFFIX);
data/simhash-0.0.20161225/simhash.c:443:9:  [3] (buffer) getopt_long:
  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.
	switch(getopt_long(argc, argv, "wmcs:f:d",
data/simhash-0.0.20161225/simhash.c:170:15:  [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).
    FILE *f = fopen(filename, "r");
data/simhash-0.0.20161225/simhash.c:195:12:  [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 nambuf[MAXPATHLEN + 1];
data/simhash-0.0.20161225/simhash.c:207:7:  [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).
	of = fopen(nambuf, "w");
data/simhash-0.0.20161225/simhash.c:265:15:  [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).
    FILE *f = fopen(name, "r");
data/simhash-0.0.20161225/simhash.c:455:17:  [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).
	    nshingle = atoi(optarg);
data/simhash-0.0.20161225/simhash.c:463:17:  [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).
	    nfeature = atoi(optarg);
data/simhash-0.0.20161225/simhash.c:112:11:  [1] (buffer) fgetc:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
	int ch = fgetc(f);
data/simhash-0.0.20161225/simhash.c:123:7:  [1] (buffer) fgetc:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
	ch = fgetc(f);
data/simhash-0.0.20161225/simhash.c:203:2:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
	strncpy(nambuf, argv[i],
data/simhash-0.0.20161225/simhash.c:394:10:  [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).
	int n = strlen(argv[i]);
data/simhash-0.0.20161225/simhash.c:414:11:  [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).
	for (j = strlen(argv[i]); j <= nfilename; j++)

ANALYSIS SUMMARY:

Hits = 13
Lines analyzed = 910 in approximately 0.04 seconds (25238 lines/second)
Physical Source Lines of Code (SLOC) = 684
Hits@level = [0]  35 [1]   5 [2]   6 [3]   1 [4]   1 [5]   0
Hits@level+ = [0+]  48 [1+]  13 [2+]   8 [3+]   2 [4+]   1 [5+]   0
Hits/KSLOC@level+ = [0+] 70.1754 [1+] 19.0058 [2+] 11.6959 [3+] 2.92398 [4+] 1.46199 [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.