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/ascii-3.18/ascii.c

FINAL RESULTS:

data/ascii-3.18/ascii.c:382:13:  [5] (buffer) strncat:
  Easily used incorrectly (e.g., incorrectly computing the correct maximum
  size to add) [MS-banned] (CWE-120). Consider strcat_s, strlcat, snprintf,
  or automatically resizing strings. Risk is high; the length parameter
  appears to be a constant, instead of computing the number of characters
  left.
            strncat(rep, "1", sizeof(rep));
data/ascii-3.18/ascii.c:384:13:  [5] (buffer) strncat:
  Easily used incorrectly (e.g., incorrectly computing the correct maximum
  size to add) [MS-banned] (CWE-120). Consider strcat_s, strlcat, snprintf,
  or automatically resizing strings. Risk is high; the length parameter
  appears to be a constant, instead of computing the number of characters
  left.
            strncat(rep, "0", sizeof(rep));
data/ascii-3.18/ascii.c:82:16:  [3] (buffer) getopt:
  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.
    while( (op=getopt(argc, argv, opt_string)) != -1) {
data/ascii-3.18/ascii.c:125:12:  [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	rep[BITSPERCHAR + 1];
data/ascii-3.18/ascii.c:344:2:  [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.
	char	canbuf[BUFSIZ], *ep;
data/ascii-3.18/ascii.c:373:12:  [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 rep[9];
data/ascii-3.18/ascii.c:179:9:  [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 (; strlen(*ptr) < 4 && isupper(**ptr); ptr++)
data/ascii-3.18/ascii.c:223:18:  [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).
    size_t len = strlen(str);
data/ascii-3.18/ascii.c:355:16:  [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).
	ep = canbuf + strlen(canbuf) - 4;
data/ascii-3.18/ascii.c:360:16:  [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).
	while (canbuf[strlen(canbuf) - 1] == ' ')
data/ascii-3.18/ascii.c:361:13:  [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).
	    canbuf[strlen(canbuf) - 1] = '\0';
data/ascii-3.18/ascii.c:407:25:  [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(name);

ANALYSIS SUMMARY:

Hits = 12
Lines analyzed = 441 in approximately 0.02 seconds (19614 lines/second)
Physical Source Lines of Code (SLOC) = 340
Hits@level = [0]  34 [1]   6 [2]   3 [3]   1 [4]   0 [5]   2
Hits@level+ = [0+]  46 [1+]  12 [2+]   6 [3+]   3 [4+]   2 [5+]   2
Hits/KSLOC@level+ = [0+] 135.294 [1+] 35.2941 [2+] 17.6471 [3+] 8.82353 [4+] 5.88235 [5+] 5.88235
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.