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/ruby-redcarpet-3.5.0/ext/redcarpet/html.h
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/stack.h
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/stack.c
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/rc_markdown.c
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/redcarpet.h
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/html.c
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/houdini.h
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/autolink.c
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/houdini_href_e.c
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/buffer.h
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/html_blocks.h
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/markdown.c
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/buffer.c
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/markdown.h
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/rc_render.c
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/html_smartypants.c
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/houdini_html_e.c
Examining data/ruby-redcarpet-3.5.0/ext/redcarpet/autolink.h

FINAL RESULTS:

data/ruby-redcarpet-3.5.0/ext/redcarpet/buffer.c:38:25:  [4] (format) vsnprintf:
  If format strings can be influenced by an attacker, they can be exploited,
  and note that sprintf variations do not always \0-terminate (CWE-134). Use
  a constant for the format specification.
#	define _buf_vsnprintf vsnprintf
data/ruby-redcarpet-3.5.0/ext/redcarpet/buffer.h:82:73:  [4] (format) printf:
  If format strings can be influenced by an attacker, they can be exploited
  (CWE-134). Use a constant for the format specification.
void bufprintf(struct buf *, const char *, ...) __attribute__ ((format (printf, 2, 3)));
data/ruby-redcarpet-3.5.0/ext/redcarpet/html_smartypants.c:32:9:  [4] (format) snprintf:
  If format strings can be influenced by an attacker, they can be exploited,
  and note that sprintf variations do not always \0-terminate (CWE-134). Use
  a constant for the format specification.
#define snprintf	_snprintf
data/ruby-redcarpet-3.5.0/ext/redcarpet/html_smartypants.c:32:18:  [4] (format) _snprintf:
  If format strings can be influenced by an attacker, they can be exploited,
  and note that sprintf variations do not always \0-terminate (CWE-134). Use
  a constant for the format specification.
#define snprintf	_snprintf
data/ruby-redcarpet-3.5.0/ext/redcarpet/autolink.c:49:17:  [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.
			strncasecmp((char *)link, valid_uris[i], len) == 0 &&
data/ruby-redcarpet-3.5.0/ext/redcarpet/buffer.c:169:2:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
	memcpy(buf->data + buf->size, data, len);
data/ruby-redcarpet-3.5.0/ext/redcarpet/houdini_href_e.c:80:2:  [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 hex_str[3];
data/ruby-redcarpet-3.5.0/ext/redcarpet/html.c:782:2:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
	memcpy(callbacks, &cb_default, sizeof(struct sd_callbacks));
data/ruby-redcarpet-3.5.0/ext/redcarpet/html.c:833:2:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
	memcpy(callbacks, &cb_default, sizeof(struct sd_callbacks));
data/ruby-redcarpet-3.5.0/ext/redcarpet/html_blocks.h:37:17:  [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 unsigned char gperf_downcase[256] =
data/ruby-redcarpet-3.5.0/ext/redcarpet/html_smartypants.c:121:2:  [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 ent[8];
data/ruby-redcarpet-3.5.0/ext/redcarpet/markdown.c:2748:2:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
	memcpy(&md->cb, callbacks, sizeof(struct sd_callbacks));
data/ruby-redcarpet-3.5.0/ext/redcarpet/autolink.c:46:16:  [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).
		size_t len = strlen(valid_uris[i]);
data/ruby-redcarpet-3.5.0/ext/redcarpet/autolink.c:181:39:  [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 (size < 4 || memcmp(data, "www.", strlen("www.")) != 0)
data/ruby-redcarpet-3.5.0/ext/redcarpet/autolink.c:278:13:  [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).
	link_end = strlen("://");
data/ruby-redcarpet-3.5.0/ext/redcarpet/buffer.c:177:19:  [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).
	bufput(buf, str, strlen(str));
data/ruby-redcarpet-3.5.0/ext/redcarpet/html_smartypants.c:108:16:  [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).
		size_t len = strlen(*p);
data/ruby-redcarpet-3.5.0/ext/redcarpet/markdown.c:2094:20:  [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 tag_size = strlen(curtag);

ANALYSIS SUMMARY:

Hits = 18
Lines analyzed = 6553 in approximately 0.17 seconds (38163 lines/second)
Physical Source Lines of Code (SLOC) = 4522
Hits@level = [0]   1 [1]   6 [2]   8 [3]   0 [4]   4 [5]   0
Hits@level+ = [0+]  19 [1+]  18 [2+]  12 [3+]   4 [4+]   4 [5+]   0
Hits/KSLOC@level+ = [0+] 4.20168 [1+] 3.98054 [2+] 2.65369 [3+] 0.884564 [4+] 0.884564 [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.