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/tty-clock-2.3/ttyclock.c
Examining data/tty-clock-2.3/ttyclock.h

FINAL RESULTS:

data/tty-clock-2.3/ttyclock.c:215:6:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
     sprintf(ttyclock->date.datestr, "%s%s", tmpstr, ttyclock->meridiem);
data/tty-clock-2.3/ttyclock.c:565:18:  [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 ((c = getopt(argc, argv, "iuvsScbtrhBxnDC:f:d:T:a:")) != -1)
data/tty-clock-2.3/ttyclock.c:43:20:  [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 *ftty = fopen(ttyclock->tty, "r+");
data/tty-clock-2.3/ttyclock.c:183:6:  [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 tmpstr[128];
data/tty-clock-2.3/ttyclock.c:617:19:  [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).
               if(atoi(optarg) >= 0 && atoi(optarg) < 8)
data/tty-clock-2.3/ttyclock.c:617:40:  [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).
               if(atoi(optarg) >= 0 && atoi(optarg) < 8)
data/tty-clock-2.3/ttyclock.c:618:46:  [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).
                    ttyclock->option.color = atoi(optarg);
data/tty-clock-2.3/ttyclock.c:630:19:  [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).
               if(atol(optarg) >= 0 && atol(optarg) < 100)
data/tty-clock-2.3/ttyclock.c:630:40:  [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).
               if(atol(optarg) >= 0 && atol(optarg) < 100)
data/tty-clock-2.3/ttyclock.c:631:46:  [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).
                    ttyclock->option.delay = atol(optarg);
data/tty-clock-2.3/ttyclock.c:640:19:  [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).
               if(atol(optarg) >= 0 && atol(optarg) < 1000000000)
data/tty-clock-2.3/ttyclock.c:640:40:  [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).
               if(atol(optarg) >= 0 && atol(optarg) < 1000000000)
data/tty-clock-2.3/ttyclock.c:641:48:  [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).
                    ttyclock->option.nsdelay = atol(optarg);
data/tty-clock-2.3/ttyclock.h:102:11:  [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 datestr[256];
data/tty-clock-2.3/ttyclock.c:117:43:  [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).
     ttyclock->datewin = newwin(DATEWINH, strlen(ttyclock->date.datestr) + 2,
data/tty-clock-2.3/ttyclock.c:120:34:  [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).
                                (strlen(ttyclock->date.datestr) / 2) - 1);
data/tty-clock-2.3/ttyclock.c:325:60:  [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).
                ttyclock->geo.y + (ttyclock->geo.w / 2) - (strlen(ttyclock->date.datestr) / 2) - 1);
data/tty-clock-2.3/ttyclock.c:326:48:  [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).
          wresize(ttyclock->datewin, DATEWINH, strlen(ttyclock->date.datestr) + 2);
data/tty-clock-2.3/ttyclock.c:555:6:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120). Risk is low because the source is a
  constant string.
     strncpy(ttyclock->option.format, "%F", 100);
data/tty-clock-2.3/ttyclock.c:627:16:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
               strncpy(ttyclock->option.format, optarg, 100);

ANALYSIS SUMMARY:

Hits = 20
Lines analyzed = 827 in approximately 0.05 seconds (16529 lines/second)
Physical Source Lines of Code (SLOC) = 609
Hits@level = [0]   5 [1]   6 [2]  12 [3]   1 [4]   1 [5]   0
Hits@level+ = [0+]  25 [1+]  20 [2+]  14 [3+]   2 [4+]   1 [5+]   0
Hits/KSLOC@level+ = [0+] 41.0509 [1+] 32.8407 [2+] 22.9885 [3+] 3.28407 [4+] 1.64204 [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.