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Re: how to do this?

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Ian Collins wrote:
> bilsch01 wrote:
>> I don't know how to write code to eliminate repetitiveness.  The program
>> below operates on four files, does several tasks for each.  I want to
>> learn a way to do the same thing with 1/4 of the code by having (a
>> macro?) substitute 1, 2, 3, 4 in the code where needed when the program
>> runs.
>
> The obvious starting point is to create a function to open and read the
> files with the necessary error checking.  Say:
>
> char*
> load( const char* filename )
> {
>     FILE* fp = fopen(filename, "r");
>
>     if( fp == NULL)
>     {
>       printf("\nerror opening file %s\n", filename );
>       return NULL;
>     }
>
>     const size_t buffSize = 2305;
>     char* buffer = malloc(buffSize);
>
>     if( (fread( buffer, buffSize-1, 1, fp )) != buffSize-1 )
>     {
>       printf("\nerror reading from file %s\n", filename );
>       free( buffer );
>       return NULL;
>     }
>
>     // What goes in the last character?
>
>     return buffer;
> }

Not forgetting to close the file....

-- 
Ian Collins

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Thread

how to do this? bilsch01 <king621@comcast.net> - 2015-11-14 12:09 -0800
  Re: how to do this? Rosario19 <Ros@invalid.invalid> - 2015-11-14 21:49 +0100
  Re: how to do this? Ian Collins <ian-news@hotmail.com> - 2015-11-15 10:02 +1300
    Re: how to do this? Ian Collins <ian-news@hotmail.com> - 2015-11-15 10:17 +1300
    Re: how to do this? bilsch01 <king621@comcast.net> - 2015-11-14 15:16 -0800
      Re: how to do this? James Kuyper <jameskuyper@verizon.net> - 2015-11-14 18:24 -0500
        Re: how to do this? bilsch01 <king621@comcast.net> - 2015-11-14 15:30 -0800
          Re: how to do this? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-11-14 19:01 -0500
          Re: how to do this? James Kuyper <jameskuyper@verizon.net> - 2015-11-14 19:07 -0500
  Re: how to do this? Ian Collins <ian-news@hotmail.com> - 2015-11-15 11:26 +1300
    Re: how to do this? bilsch01 <king621@comcast.net> - 2015-11-14 15:07 -0800
      Re: how to do this? James Kuyper <jameskuyper@verizon.net> - 2015-11-14 18:17 -0500
      Re: how to do this? bilsch01 <king621@comcast.net> - 2015-11-14 15:25 -0800
        Re: how to do this? Ian Collins <ian-news@hotmail.com> - 2015-11-15 13:10 +1300
          Re: how to do this? James Kuyper <jameskuyper@verizon.net> - 2015-11-14 19:21 -0500
            Re: how to do this? Ian Collins <ian-news@hotmail.com> - 2015-11-15 13:24 +1300
        Re: how to do this? James Kuyper <jameskuyper@verizon.net> - 2015-11-14 19:12 -0500
          Re: how to do this? Ian Collins <ian-news@hotmail.com> - 2015-11-15 13:18 +1300
            Re: how to do this? James Kuyper <jameskuyper@verizon.net> - 2015-11-14 19:23 -0500
  Re: how to do this? bilsch01 <king621@comcast.net> - 2015-11-14 15:18 -0800

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