Re: function Name

jscottkasten_at_yahoo.com
Date: 07/08/05

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    Date: 	Fri, 8 Jul 2005 07:48:22 -0700 (PDT)
To: raja <vnagaraju@effigent.net>

    --- raja <vnagaraju@effigent.net> wrote:

    > hi,
    > I am writing a function that takes the return
    > value of the another
    > function and gives the status of the function.
    > if
    > error("functionName",arguments)
    > here the function with Name "functionName " is to be
    > executed with the
    > corresponding argunents.But by knowing the function
    > name how can i get
    > the address if that function and how can i execute
    > the function with the
    > arguments.
    >

    Dude, this is not the right forum for these types of
    questions. You need to look at some good general
    texts. I don't know if you can get a copy of Steven's
    or other general Unix programming text, but that's
    what would help you the most. Anyway, here's an
    example for you. The C compiler in general treats a
    function name as a type of pointer, similar to an
    array base pointer in that you cannot modify it, but
    you can de-reference it.

    /* Crude demo program for calling a function
     * by indirect means and supplying arguments.
     *
     * Yes, it's GPL. :-)
     */

    #include <stdio.h>

    int foo(char *message)
    {
      int error = 0;

      if (message)
        printf("%s\n", message);
      else
        error = 1;

      return error;
    }

    int call_a_function(int (*func)(char *), char *arg)
    {
      return (*func)(arg);
    }

    int main(int argc, char *argv[])
    {
      int (*func)(char *);
      char *arg;

      if (argc == 2) {
        func = foo;
        arg = argv[1];
        return call_a_function(func, arg);
      } else {
        return 1;
      }
    }

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