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iphlpapi: Clarify interface counting.

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This commit is contained in:
Mark Adams 2007-01-25 20:14:53 -05:00 committed by Alexandre Julliard
parent 267fcdd009
commit a91d69190e
1 changed files with 4 additions and 3 deletions
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7
dlls/iphlpapi/ifenum.c
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@ -673,14 +673,16 @@ static DWORD enumIPAddresses(PDWORD pcAddresses, struct ifconf *ifc)
int ioctlRet = 0;
DWORD guessedNumAddresses = 0, numAddresses = 0;
caddr_t ifPtr;
int lastlen;
ret = NO_ERROR;
ifc->ifc_len = 0;
ifc->ifc_buf = NULL;
/* there is no way to know the interface count beforehand,
so we need to loop again and again upping our max each time
until returned < max */
until returned is constant across 2 calls */
do {
lastlen = ifc->ifc_len;
HeapFree(GetProcessHeap(), 0, ifc->ifc_buf);
if (guessedNumAddresses == 0)
guessedNumAddresses = INITIAL_INTERFACES_ASSUMED;
@ -689,8 +691,7 @@ static DWORD enumIPAddresses(PDWORD pcAddresses, struct ifconf *ifc)
ifc->ifc_len = sizeof(struct ifreq) * guessedNumAddresses;
ifc->ifc_buf = HeapAlloc(GetProcessHeap(), 0, ifc->ifc_len);
ioctlRet = ioctl(fd, SIOCGIFCONF, ifc);
} while (ioctlRet == 0 &&
ifc->ifc_len > (sizeof(struct ifreq) * (guessedNumAddresses - 2)));
} while ((ioctlRet == 0) && (ifc->ifc_len != lastlen));
if (ioctlRet == 0) {
ifPtr = ifc->ifc_buf;