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/jester-1.0/jester.h
Examining data/jester-1.0/jester.c

FINAL RESULTS:

data/jester-1.0/jester.c:239:5:  [4] (buffer) strcpy:
  Does not check for buffer overflows when copying to destination [MS-banned]
  (CWE-120). Consider using snprintf, strcpy_s, or strlcpy (warning: strncpy
  easily misused).
    strcpy(rv, s);
data/jester-1.0/jester.c:895:3:  [4] (format) sprintf:
  Potential format string problem (CWE-134). Make format string constant.
  sprintf(text, format, white_pieces, black_pieces);
data/jester-1.0/jester.c:1252:5:  [4] (buffer) strcpy:
  Does not check for buffer overflows when copying to destination [MS-banned]
  (CWE-120). Consider using snprintf, strcpy_s, or strlcpy (warning: strncpy
  easily misused).
    strcpy(copy, s);
data/jester-1.0/jester.c:43:3:  [3] (random) srand:
  This function is not sufficiently random for security-related functions
  such as key and nonce creation (CWE-327). Use a more secure technique for
  acquiring random values.
  srand(time(NULL));
data/jester-1.0/jester.c:237:11:  [3] (buffer) getenv:
  Environment variables are untrustable input if they can be set by an
  attacker. They can have any content and length, and the same variable can
  be set more than once (CWE-807, CWE-20). Check environment variables
  carefully before using them.
     (s = getenv("DISPLAY"))) {
data/jester-1.0/jester.c:269:8:  [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).
  rv = atoi(s);
data/jester-1.0/jester.c:888:3:  [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 text[256];
data/jester-1.0/jester.c:1261:10:  [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).
    *x = atoi(p2);
data/jester-1.0/jester.c:1267:10:  [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).
    *y = atoi(p2);
data/jester-1.0/jester.c:238:25:  [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).
    rv = (char *)malloc(strlen(s) + 1);
data/jester-1.0/jester.c:799:8:  [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).
	      strlen(exit_text));
data/jester-1.0/jester.c:864:31:  [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).
  rv = XTextWidth(fstruct, s, strlen(s));
data/jester-1.0/jester.c:901:54:  [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).
  XDrawString(display, score_window, gc, x, y, text, strlen(text));
data/jester-1.0/jester.c:950:58:  [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).
  XDrawString(display, player_id_window, gc, x, y, text, strlen(text));
data/jester-1.0/jester.c:1251:27:  [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).
    copy = (char *)malloc(strlen(s) + 1);

ANALYSIS SUMMARY:

Hits = 15
Lines analyzed = 1437 in approximately 0.08 seconds (17651 lines/second)
Physical Source Lines of Code (SLOC) = 1127
Hits@level = [0]  10 [1]   6 [2]   4 [3]   2 [4]   3 [5]   0
Hits@level+ = [0+]  25 [1+]  15 [2+]   9 [3+]   5 [4+]   3 [5+]   0
Hits/KSLOC@level+ = [0+] 22.1828 [1+] 13.3097 [2+] 7.9858 [3+] 4.43656 [4+] 2.66193 [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.