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/ttylog-0.31/ttylog.c

FINAL RESULTS:

data/ttylog-0.31/ttylog.c:60:3:  [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 line[1024], modem_device[512];
data/ttylog-0.31/ttylog.c:157:19:  [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).
        int sec = atoi(argv[i + 1]);
data/ttylog-0.31/ttylog.c:163:37:  [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).
        new_value.it_value.tv_sec = atoi(argv[i + 1]);
data/ttylog-0.31/ttylog.c:178:13:  [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).
  logfile = fopen (modem_device, "rb");
data/ttylog-0.31/ttylog.c:134:13:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
            strncpy (modem_device, argv[i + 1], sizeof(modem_device)-1);
data/ttylog-0.31/ttylog.c:173:8:  [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).
  if (!strlen(modem_device)) {
data/ttylog-0.31/ttylog.c:227:23:  [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).
              timestr[strlen(timestr) - 1] = 0;

ANALYSIS SUMMARY:

Hits = 7
Lines analyzed = 242 in approximately 0.03 seconds (9164 lines/second)
Physical Source Lines of Code (SLOC) = 191
Hits@level = [0]  26 [1]   3 [2]   4 [3]   0 [4]   0 [5]   0
Hits@level+ = [0+]  33 [1+]   7 [2+]   4 [3+]   0 [4+]   0 [5+]   0
Hits/KSLOC@level+ = [0+] 172.775 [1+] 36.6492 [2+] 20.9424 [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.