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lib: fix type-punning in ip_masklen()

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ip_masklen() was likely to return incorrect results after being compiled
with -fstrict-aliasing (-O2, -O3, -Os)
This commit is contained in:
Denis Ovsienko 2011-12-16 16:25:02 +04:00
parent d171bf58ef
commit 2654e43ca2
1 changed files with 7 additions and 2 deletions
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9
lib/prefix.c
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@ -2592,8 +2592,13 @@ masklen2ip (const int masklen, struct in_addr *netmask)
u_char
ip_masklen (struct in_addr netmask)
{
u_int16_t * int16 = (u_int16_t *) &netmask.s_addr;
return map64kto17_nbo[int16[0]] + map64kto17_nbo[int16[1]];
union
{
u_int32_t int32;
u_int16_t int16[2];
} u;
u.int32 = netmask.s_addr;
return map64kto17_nbo[u.int16[0]] + map64kto17_nbo[u.int16[1]];
}
/* Apply mask to IPv4 prefix (network byte order). */