apache / apr - Conditional Complexity

Intro

Conditional complexity (also called cyclomatic complexity) is a term used to measure the complexity of software. The term refers to the number of possible paths through a program function. A higher value ofter means higher maintenance and testing costs (infosecinstitute.com).
Conditional complexity is calculated by counting all conditions in the program that can affect the execution path (e.g. if statement, loops, switches, and/or operators, try and catch blocks...).
Conditional complexity is measured at the unit level (methods, functions...).
Units are classified in four categories based on the measured McCabe index: 1-5 (simple units), 6-10 (medium complex units), 11-25 (complex units), 26+ (very complex units).

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Conditional Complexity Overall

There are 1,224 units with 30,523 lines of code in units (32.0% of code).

4 very complex units (826 lines of code)
28 complex units (3,767 lines of code)
128 medium complex units (8,318 lines of code)
191 simple units (6,673 lines of code)
873 very simple units (10,939 lines of code)

Legend:

51+

26-50

11-25

6-10

1-5

Alternative Visuals

3D view of all units

Conditional Complexity per Extension

51+

26-50

11-25

6-10

1-5

Conditional Complexity per Logical Component

primary logical decomposition

51+

26-50

11-25

6-10

1-5

Most Complex Units

Top 50 most complex units

Unit	# lines	McCabe index	# params
static apr_status_t apr_json_decode_string() in json/apr_json_decode.c	254	104	2
static APR_INLINE int fnmatch_ch() in strings/apr_fnmatch.c	79	53	3
apr_status_t apr_socket_opt_set() in network_io/unix/sockopt.c	212	51	3
apr_status_t apr_jose_decode_json_jwe() in jose/apr_jose_decode.c	281	51	10
static apr_status_t dbd_mysql_datum_get() in dbd/apr_dbd_mysql.c	145	49	4
static apr_status_t dbd_oracle_datum_get() in dbd/apr_dbd_oracle.c	156	44	4
apr_status_t apr_jose_decode_json_jws() in jose/apr_jose_decode.c	246	43	10
static apr_status_t proc_mutex_choose_method() in locks/unix/proc_mutex.c	169	42	3
void post_parse_fixup() in build/aplibtool.c	84	41	1
static apr_status_t apr_json_decode_number() in json/apr_json_decode.c	124	39	2
sub fixcwd() in build/fixwin32mak.pl	115	39	0
static apr_status_t apr_ldap_status() in ldap/apr_ldap.c	98	38	1
static apr_status_t crypto_key() in crypto/apr_crypto_nss.c	198	37	4
apr_status_t apr_socket_sendfile() in network_io/unix/sendrecv.c	117	35	6
apr_status_t more_finfo() in file_io/win32/filestat.c	94	32	4
static int readExports() in dso/aix/dso.c	134	31	1
static apr_status_t crypto_make() in crypto/apr_crypto_openssl.c	159	31	4
static apr_status_t crypto_key() in crypto/apr_crypto_openssl.c	144	31	4
static int dbd_pgsql_select() in dbd/apr_dbd_pgsql.c	136	30	5
static int dbd_pgsql_pselect_internal() in dbd/apr_dbd_pgsql.c	159	30	8
static apr_status_t crypto_digest_final() in crypto/apr_crypto_openssl.c	110	29	1
static void dbd_mysql_bbind() in dbd/apr_dbd_mysql.c	127	29	4
static int dbd_pgsql_prepare() in dbd/apr_dbd_pgsql.c	119	29	8
apr_status_t apr_socket_sendfile() in network_io/unix/sendrecv.c	107	27	6
static apr_status_t apr_json_encode_string() in json/apr_json_encode.c	97	27	2
int run_mode() in build/jlibtool.c	144	27	1
static apr_status_t crypto_key() in crypto/apr_crypto_commoncrypto.c	109	26	4
static apr_status_t crypto_digest_final() in crypto/apr_crypto_nss.c	109	26	1
static SQLRETURN odbc_set_result_column() in dbd/apr_dbd_odbc.c	83	26	3
static int outputParams() in dbd/apr_dbd_oracle.c	143	26	2
static void dbd_oracle_bbind() in dbd/apr_dbd_oracle.c	211	26	2
static apr_status_t apr_jose_encode_json_jwe() in jose/apr_jose_encode.c	130	26	6
apr_status_t apr_dir_read() in file_io/unix/dir.c	96	25	3
int main() in tools/gen_test_char.c	68	25	2
apr_status_t apr_socket_sendfile() in network_io/unix/sendrecv.c	110	25	6
static void dbd_pgsql_bbind() in dbd/apr_dbd_pgsql.c	71	25	6
static apr_status_t dbd_sqlite3_datum_get() in dbd/apr_dbd_sqlite3.c	74	25	4
static void dbd_sqlite3_bbind() in dbd/apr_dbd_sqlite3.c	72	25	2
static apr_status_t odbc_parse_params() in dbd/apr_dbd_odbc.c	88	25	10
static apr_status_t dbd_sqlite_datum_get() in dbd/apr_dbd_sqlite2.c	73	25	4
static apr_size_t elem_size() in xml/apr_xml.c	73	25	4
static apr_status_t proc_mutex_pthread_acquire_ex() in locks/unix/proc_mutex.c	138	25	2
static apr_status_t read_with_timeout() in file_io/win32/readwrite.c	77	24	4
static apr_status_t dbd_pgsql_datum_get() in dbd/apr_dbd_pgsql.c	71	24	4
static apr_status_t apr_jose_encode_json_jws() in jose/apr_jose_encode.c	120	24	6
apr_status_t apr_socket_sendfile() in network_io/unix/sendrecv.c	87	23	6
static apr_status_t crypto_digest_final() in crypto/apr_crypto_commoncrypto.c	93	23	1
int parse_input_file_name() in build/jlibtool.c	114	23	2
static void start_handler() in xml/apr_xml.c	112	23	3
apr_status_t apr_jose_decode_compact() in jose/apr_jose_decode.c	110	23	7