minix man page for onec_sum

ONE_CSUM(3)						     Library Functions Manual						       ONE_CSUM(3)

NAME
       oneC_sum - One's complement internet checksum

SYNOPSIS
       #define _MINIX_SOURCE 1
       #include <stddef.h>
       #include <sys/types.h>

       #include <net/gen/oneCsum.h>

       u16_t oneC_sum(u16_t prev, u16_t *data, size_t size)

DESCRIPTION
       OneC_sum  is used to calculate the one's complement checksum needed for IP network packets.  A good document about the Internet Checksum is
       RFC-1071 (Computing the Internet checksum).

       One_Csum expects three parameters:

       prev	 The checksum of previous blocks of data that are to be included in the checksum.  The value of prev in  first	call  to  oneC_sum
		 should be 0.

       data	 A  pointer  to the block of data.  The data is interpreted as a series of 16 bit numbers in network byte order, but an odd number
		 of bytes is also allowed.

       size	 The size of the data in bytes.

SEE ALSO
       ip(4).
       RFC-1071

AUTHOR
       Philip Homburg (philip@cs.vu.nl)

																       ONE_CSUM(3)