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fgets - design deficiency: no efficient way of finding last character read

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Hello,

The last character read from fgets(buf, sizeof(buf), inputstream) is:
'\n'
OR
any character x, when no '\n' was encountered in sizeof(buf)-1
consecutive chars, or when x is the last char of the inputstream

***How can one EFFICIENTLY determine if the last character is '\n'??
"Efficiently" means: don't use strlen!!!

I only come up with the strlen method, which - to me - says that fgets
has a bad design.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char *argv[])
{
  char buf[6];
  FILE *fp = stdin;
  while (fgets(buf, sizeof(buf), fp)) {
    printf((buf[strlen(buf)-1] == '\n') ? "Got a line which ends with
newline: %s" : "no newline: %s", buf);
  }


  return EXIT_SUCCESS;
}



A well-designed fgets function should return the length of characters
read, should it not??

Please surprise me, that there is a way of efficiently determining the
number of characters read. ;)
I've thought of ftell, but I think that does not work with stdin.

Because right now, I think that fgets really seems useless.
Why is the standard C library so inefficient?
Do I really have to go about designing my own library? ;)

Thanks for tipps and pointers

Regards,
J.

(PS: I've posted to comp.lang.c but don't see my post appearing, so
I'll try here instead)
-- 
comp.lang.c.moderated - moderation address: clcm@plethora.net -- you must
have an appropriate newsgroups line in your header for your mail to be seen,
or the newsgroup name in square brackets in the subject line.  Sorry.

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fgets - design deficiency: no efficient way of finding last character read John Reye <jononanon@googlemail.com> - 2012-04-23 08:33 -0500
  Re: fgets - design deficiency: no efficient way of finding last character read Barry Schwarz <schwarzb@dqel.com> - 2012-04-30 21:57 -0500
  Re: fgets - design deficiency: no efficient way of finding last character read Jasen Betts <jasen@xnet.co.nz> - 2012-04-30 21:59 -0500
  Re: fgets - design deficiency: no efficient way of finding last character read James Kuyper <jameskuyper@verizon.net> - 2012-04-30 21:57 -0500
  Re: fgets - design deficiency: no efficient way of finding last character read Dag-Erling Smørgrav <des@des.no> - 2012-04-30 21:57 -0500
  Re: fgets - design deficiency: no efficient way of finding last character read Thomas Richter <thor@math.tu-berlin.de> - 2012-04-30 21:58 -0500
  Re: fgets - design deficiency: no efficient way of finding last character read John Reye <jononanon@googlemail.com> - 2012-04-30 21:59 -0500

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