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core: add nm_utils_10pow() utils

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This commit is contained in:
Thomas Haller 2017-03-23 16:01:07 +01:00
parent d628ada05a
commit 25654cfa31
3 changed files with 85 additions and 0 deletions
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31
src/nm-core-utils.c
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@ -155,6 +155,37 @@ _nm_singleton_instance_register_destruction (GObject *instance)
/*****************************************************************************/
static double
_10pow (guint16 ex)
{
double v;
if (ex == 0)
return 1.0;
v = _10pow (ex / 2);
v = v * v;
if (ex % 2)
v *= 10;
return v;
}
/*/
* nm_utils_10pow:
* @ex: the exponent
*
* Returns: 10^ex or pow(10, ex)
*/
double
nm_utils_10pow (gint16 ex)
{
if (ex >= 0)
return _10pow (ex);
return 1.0 / _10pow (- ((gint32) ex));
}
/*****************************************************************************/
/*
* nm_ethernet_address_is_valid:
* @addr: pointer to a binary or ASCII Ethernet address

2
src/nm-core-utils.h
View file

@ -97,6 +97,8 @@ in_addr_t nm_utils_ip4_address_clear_host_address (in_addr_t addr, guint8 plen);
const struct in6_addr *nm_utils_ip6_address_clear_host_address (struct in6_addr *dst, const struct in6_addr *src, guint8 plen);
gboolean nm_utils_ip6_address_same_prefix (const struct in6_addr *addr_a, const struct in6_addr *addr_b, guint8 plen);
double nm_utils_10pow (gint16 e);
/**
* nm_utils_ip6_route_metric_normalize:
* @metric: the route metric

52
src/tests/test-general.c
View file

@ -23,6 +23,9 @@
#include <string.h>
#include <errno.h>
/* need math.h for isinf() and INFINITY. No need to link with -lm */
#include <math.h>
#include "NetworkManagerUtils.h"
#include "nm-core-internal.h"
@ -1653,6 +1656,53 @@ test_stable_id_generated_complete (void)
/*****************************************************************************/
static void
test_nm_utils_10pow (void)
{
#define FLOAT_CMP(a, b) \
G_STMT_START { \
double _a = (a); \
double _b = (b); \
\
if (isinf (_b)) \
g_assert (isinf (_a)); \
else if (_b >= 0.0 && _b <= 0.0) \
g_assert (_a >= 0.0 && _a <= 0.0); \
else { \
double _x = (_a) - (_b); \
g_assert (_b > 0.0); \
if (_x < 0.0) \
_x = -_x; \
g_assert (_x / _b < 1E-10); \
} \
} G_STMT_END
FLOAT_CMP (nm_utils_10pow (G_MININT16), 0.0);
FLOAT_CMP (nm_utils_10pow (-310), 0.0);
FLOAT_CMP (nm_utils_10pow (-309), 0.0);
FLOAT_CMP (nm_utils_10pow (-308), 1e-308);
FLOAT_CMP (nm_utils_10pow (-307), 1e-307);
FLOAT_CMP (nm_utils_10pow (-1), 1e-1);
FLOAT_CMP (nm_utils_10pow (-2), 1e-2);
FLOAT_CMP (nm_utils_10pow (0), 1e0);
FLOAT_CMP (nm_utils_10pow (1), 1e1);
FLOAT_CMP (nm_utils_10pow (2), 1e2);
FLOAT_CMP (nm_utils_10pow (3), 1e3);
FLOAT_CMP (nm_utils_10pow (4), 1e4);
FLOAT_CMP (nm_utils_10pow (5), 1e5);
FLOAT_CMP (nm_utils_10pow (6), 1e6);
FLOAT_CMP (nm_utils_10pow (7), 1e7);
FLOAT_CMP (nm_utils_10pow (122), 1e122);
FLOAT_CMP (nm_utils_10pow (200), 1e200);
FLOAT_CMP (nm_utils_10pow (307), 1e307);
FLOAT_CMP (nm_utils_10pow (308), 1e308);
FLOAT_CMP (nm_utils_10pow (309), INFINITY);
FLOAT_CMP (nm_utils_10pow (310), INFINITY);
FLOAT_CMP (nm_utils_10pow (G_MAXINT16), INFINITY);
}
/*****************************************************************************/
NMTST_DEFINE ();
int
@ -1666,6 +1716,8 @@ main (int argc, char **argv)
g_test_add_func ("/general/nm_utils_ip6_address_same_prefix", test_nm_utils_ip6_address_same_prefix);
g_test_add_func ("/general/nm_utils_log_connection_diff", test_nm_utils_log_connection_diff);
g_test_add_func ("/general/10pow", test_nm_utils_10pow);
g_test_add_func ("/general/connection-match/basic", test_connection_match_basic);
g_test_add_func ("/general/connection-match/ip6-method", test_connection_match_ip6_method);
g_test_add_func ("/general/connection-match/ip6-method-ignore", test_connection_match_ip6_method_ignore);