eSNMP API Routines inst2ip

inst2ip

Returns an IP address derived from an OID instance.

Format

int inst2ip ( unsigned int *instance, int *length,

unsigned int *ipaddr, int *exact,

int *carry );

Arguments

instance

A pointer to an array of unsigned int containing the instance numbers returned by the oid2instance routine to be converted to an IP address.

The range for elements is between zero and 255. Using the EXACT mode, the routine returns 1 if an element is out of range. Using the NEXT mode, a value greater than 255 causes that element to overflow. In this case, the value is set to 0 and the next most significant element is incremented; therefore, it returns a lexically equivalent value of the next possible ipaddr.

length

The number of elements in the instance array. Instances beyond the fourth are ignored. If the length is less than four, the missing values are assumed to be zero. A negative length results in an ipaddr value of zero. For an exact match (such as Get), there must be exactly four elements.

ipAddr

A pointer indicating where to return the IP address value. This routine is in network byte order (the most significant element is first).

exact

Can either be TRUE or FALSE.

TRUE means do an EXACT match. If any element is greater than 255 or if there are not exactly four elements, a value of 1 is returned. The carry argument is ignored.

FALSE means do a NEXT match. That is, the lexically next IP address is returned, if the carry value is set and the length is at least four. If there are fewer than four elements, this function assumes the missing values are zero. If any one element contains a value greater than 255, the value is zeroed and the next most significant element is incremented. Returns a 1 (one) only when there is a carry from the most significant (the first) value.

carry

Adds to the IP address on a NEXT match. If you are trying to determine the next possible IP address, pass in a one. Otherwise, pass in a zero. A length of less than 4 cancels the carry.

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Compaq AAR04BCTE manual Inst2ip, ESNMP API Routines inst2ip

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