Berkeley CSUA MOTD:Entry 39858
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2025/07/16 [General] UID:1000 Activity:popular
7/16    

2005/9/24-28 [Computer/SW/OS/FreeBSD, Computer/SW/Languages] UID:39858 Activity:low
9/24    Hi, I'm finding myself having to convert network order
        to host order for uint_16 as follows, is there a cleaner way?
            src = buffer[2];
            src = src << 8;
            src += buffer[1];
        \_ man htons
        \_ Uhm, I don't think your way is even correct.
           1. Do you really mean to use 1-based array indices?
           2. You're always storing the most-significant-byte in the
              position of the least-significant-byte. (Note that this is
              irrelevant to whether your host is big- or little-endian.)
              Simply writing src = buffer[0] << 8 | buffer[1] should be
              sufficient.
              \_ I thought network order was LSB first?  So it should be:
                 src = buffer[1] << 8 | buffer[0]
                 \_ You thought wrong.  Do some homework.
           \_ If you are overlaying a buffer onto the short, that is
              inherently endian-dependent. Use htons, duh.
              \_ He's not overlaying a buffer onto a short.  He's reading it
                 into a buffer first.  When he reads it out of the buffer
                 with shift and bitwise operators, the endianness of the host
                 is irrelevant. (And I'm not suggesting not to use htos, I'm
                 just saying that what he wrote originally was wrong.)
                 \- "is there a cleaner way" ... gee, ya think?
                    if this is for work, have them buy you all the stevens
                    books. if they will only buy you one, probably get
                    STEVENS: Network Programming v1. I have the 2nd ed but
                    I am sure the edition++ is fine if not better eventhough
                    STEVENS -> dead. This is "the standard". oktnx. --psb
                    STEVENS -> dead. Like VAX BSD 4.2/4.3, this is "the
                    standard".  oktnx. --psb
2025/07/16 [General] UID:1000 Activity:popular
7/16    

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