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Re: no error by fscanf on reading from output file

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On 10/31/11 01:11 AM, Eric Sosman wrote:
> On 10/30/2011 4:23 AM, Ian Collins wrote:
>> On 10/30/11 09:18 PM, Ike Naar wrote:
>>> On 2011-10-30, Ian Collins<ian-news@hotmail.com>  wrote:
>>>> On 10/30/11 07:59 PM, V.Subramanian, India wrote:
>>>>> if (fscanf(fp, "%d%d",&a,&b) == 2)
>>>>
>>>> You don't test the return of fscanf. Do so and see what happens.
>>>
>>> He does; he compares the return of fscanf with 2.
>>
>> Yes he does, but he does nothing if the test fails.
>
>       Perhaps your newsreader has lopped off part of the O.P.'s code.
> In the version I see, the "equals two" case goes down one path and
> the "else" does something entirely different.  Lightly edited:

Entirely different in the sense that it doesn't check why fscanf failed.

>   >  if (fscanf(fp, "%d%d",&a,&b) == 2) {
>   >      fprintf(stdout, "a = %d, b= %d\n", a, b);
>   >      fflush(stdout);
>   >      fclose(fp);
>   >      return EXIT_SUCCESS;
>   >  }
>   >  int err = errno;
>   >  if (ferror(fp)) {
>   >      fprintf(stderr, "Error encountered while reading input"
>   >                      " from file\n%s\n", strerror(err));
>   >      fclose(fp);
>   >      return EXIT_FAILURE;
>   >  }
>   >  fclose(fp);
>   >  return EXIT_SUCCESS;
>


-- 
Ian Collins

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no error by fscanf on reading from output file "V.Subramanian, India" <subramanian100in@yahoo.com> - 2011-10-29 23:59 -0700
  Re: no error by fscanf on reading from output file Ian Collins <ian-news@hotmail.com> - 2011-10-30 20:19 +1300
    Re: no error by fscanf on reading from output file Ike Naar <ike@iceland.freeshell.org> - 2011-10-30 08:18 +0000
      Re: no error by fscanf on reading from output file Ian Collins <ian-news@hotmail.com> - 2011-10-30 21:23 +1300
        Re: no error by fscanf on reading from output file Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-10-30 08:11 -0400
          Re: no error by fscanf on reading from output file Ian Collins <ian-news@hotmail.com> - 2011-10-31 07:38 +1300
            Re: no error by fscanf on reading from output file Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-10-30 19:40 +0000
              Re: no error by fscanf on reading from output file Ian Collins <ian-news@hotmail.com> - 2011-10-31 08:50 +1300
  Re: no error by fscanf on reading from output file "V.Subramanian, India" <subramanian100in@yahoo.com> - 2011-10-30 00:01 -0700
  Re: no error by fscanf on reading from output file Ike Naar <ike@iceland.freeshell.org> - 2011-10-30 08:39 +0000
  Re: no error by fscanf on reading from output file Carlo Dapor <catull@gmail.com> - 2011-10-30 19:16 -0700
    Re: no error by fscanf on reading from output file Ian Collins <ian-news@hotmail.com> - 2011-10-31 15:50 +1300
      Re: no error by fscanf on reading from output file "V.Subramanian, India" <subramanian100in@yahoo.com> - 2011-10-30 22:55 -0700
        Re: no error by fscanf on reading from output file pacman@kosh.dhis.org (Alan Curry) - 2011-10-31 07:14 +0000
          Re: no error by fscanf on reading from output file Ian Collins <ian-news@hotmail.com> - 2011-10-31 20:56 +1300
          Re: no error by fscanf on reading from output file Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-10-31 15:43 +0000
        Re: no error by fscanf on reading from output file Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-10-31 01:35 -0700
          Re: no error by fscanf on reading from output file Keith Thompson <kst-u@mib.org> - 2011-10-31 13:46 -0700
    Re: no error by fscanf on reading from output file Ike Naar <ike@iceland.freeshell.org> - 2011-10-31 07:02 +0000

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