Thread: Continuous socket stream,

  1. #1
    Woof, woof! zacs7's Avatar
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    Continuous socket stream,

    Hello,

    Im writting a socket-based program that connects to a server, which sends a continous stream of data through a TCP socket... Which I which to read line-by-line.

    Now what is the best way I can read each line of this stream?

    I've thought of something like:
    Code:
    char c;
    char * line;
    unsigned long int totalSize = 0;
    /* while we're getting data */
    while(recv(sock, &c, 1, 0) > 0)
    {
        totalSize++;
        line = realloc(totalSize);
        /* add c to line */
       /* check for new line */
    }
    Or is there some other way, because memory usage could get very high if a new line never comes?

    Thanks in Advance
    Last edited by zacs7; 05-07-2007 at 10:29 PM.

  2. #2
    Hurry Slowly vart's Avatar
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    reading byte-byte and then calling realloc on each char - brrrr.... I wouldn't do it...

    I'd make a static buffer of say 2048 bytes...
    Read up to this limit, then look for the end-line char in the received data and process this part...
    the last part - without end-line I will move to some dynamically resizeing buffer.
    And repeate the read...

    This approach makes smaller number of IO operations and reallocations needed...
    All problems in computer science can be solved by another level of indirection,
    except for the problem of too many layers of indirection.
    David J. Wheeler

  3. #3
    Day Dreamer
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    reallocating each time!
    That definitely is not advisable.

  4. #4
    Woof, woof! zacs7's Avatar
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    I know, thats why I asked

    Thanks for the suggestion vart, works like a charm

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