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core: add nm_utils_ip6_address_same_prefix_cmp() helper

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Useful for sorting/comparing.
This commit is contained in:
Thomas Haller 2017-07-26 10:58:39 +02:00
parent 8d03caf599
commit 54f8c2ac22
2 changed files with 36 additions and 17 deletions
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32
src/nm-core-utils.c
View file

@ -316,28 +316,28 @@ nm_utils_ip6_address_clear_host_address (struct in6_addr *dst, const struct in6_
return dst;
}
gboolean
nm_utils_ip6_address_same_prefix (const struct in6_addr *addr_a, const struct in6_addr *addr_b, guint8 plen)
int
nm_utils_ip6_address_same_prefix_cmp (const struct in6_addr *addr_a, const struct in6_addr *addr_b, guint8 plen)
{
int nbytes;
guint8 t, m;
guint8 va, vb, m;
if (plen >= 128)
return memcmp (addr_a, addr_b, sizeof (struct in6_addr)) == 0;
NM_CMP_DIRECT_MEMCMP (addr_a, addr_b, sizeof (struct in6_addr));
else {
nbytes = plen / 8;
if (nbytes)
NM_CMP_DIRECT_MEMCMP (addr_a, addr_b, nbytes);
nbytes = plen / 8;
if (nbytes) {
if (memcmp (addr_a, addr_b, nbytes) != 0)
return FALSE;
plen = plen % 8;
if (plen != 0) {
m = ~((1 << (8 - plen)) - 1);
va = ((((const guint8 *) addr_a))[nbytes]) & m;
vb = ((((const guint8 *) addr_b))[nbytes]) & m;
NM_CMP_DIRECT (va, vb);
}
}
plen = plen % 8;
if (plen == 0)
return TRUE;
m = ~((1 << (8 - plen)) - 1);
t = ((((const guint8 *) addr_a))[nbytes]) ^ ((((const guint8 *) addr_b))[nbytes]);
return (t & m) == 0;
return 0;
}
/*****************************************************************************/

21
src/nm-core-utils.h
View file

@ -122,7 +122,26 @@ gboolean nm_ethernet_address_is_valid (gconstpointer addr, gssize len);
gconstpointer nm_utils_ipx_address_clear_host_address (int family, gpointer dst, gconstpointer src, guint8 plen);
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);
int nm_utils_ip6_address_same_prefix_cmp (const struct in6_addr *addr_a, const struct in6_addr *addr_b, guint8 plen);
static inline gboolean
nm_utils_ip6_address_same_prefix (const struct in6_addr *addr_a, const struct in6_addr *addr_b, guint8 plen)
{
return nm_utils_ip6_address_same_prefix_cmp (addr_a, addr_b, plen) == 0;
}
#define NM_CMP_DIRECT_IN6ADDR_SAME_PREFIX(a, b, plen) \
NM_CMP_RETURN (nm_utils_ip6_address_same_prefix_cmp ((a), (b), (plen)))
#define NM_CMP_DIRECT_IN4ADDR_SAME_PREFIX(a, b, plen) \
G_STMT_START { \
const guint8 _plen = (plen); \
const in_addr_t _aa = (a); \
const in_addr_t _ab = (b); \
\
NM_CMP_DIRECT (htonl (nm_utils_ip4_address_clear_host_address (_aa, _plen)), \
htonl (nm_utils_ip4_address_clear_host_address (_ab, _plen))); \
} G_STMT_END
double nm_utils_exp10 (gint16 e);