Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!sppy00!dwb
From: dwb@sppy00.UUCP (David Burhans)
Newsgroups: comp.lang.c
Subject: Re: More gotos...
Keywords: Well, why not?
Message-ID: <539@sppy00.UUCP>
Date: 11 Sep 89 16:42:27 GMT
References: <10353@phoenix.Princeton.EDU>
Reply-To: dwb@sppy00.UUCP (David Burhans)
Organization: Online Computer Library Center, Dublin, Ohio.
Lines: 53

In article <10353@phoenix.Princeton.EDU> tbrakitz@phoenix.Princeton.EDU (Byron Rakitzis) writes:
>I came across what I thought was a good application for a goto:
>say you're scanning an input stream for tokens, and that you
>skip over whitespace. Furthermore, suppose that there is a pair
>of comment-delimiter characters. You also want to skip over comments.
>So:
>
>token_grabbing_function()
> {
>
> get_a_token:
>
>   while (is_white_space(c = getchar()); /* skip it */
>
>   /* So, c contains a non-whitespace character */
>
>   if (c == comment_delimiter)
>    { 
>    while (c = getchar() != other_comment_delimiter); /* skip it */
>    goto get_a_token;
>    }
>   else
>    {
>    deal_with_the_token_properly_and_return;
>    }
> }
>
>Can anyone see a goto-less version which is as concise?
>(I'm ignoring EOF errors and the like for the moment)

  How's this:

  token_grabbing_function()
  {
    while(1)
    {
      while(is_white_space(c = getchar()); /* skip it */

      if (c == comment_delimiter)
	while( (c = getchar()) != other_comment_delimiter);
      else
      {
	/* deal with token and return */
      }
    }
  }

  -DwB
-- 
dwb@sppy00	{att|killer|pyramid}!osu-cis!sppy00!dwb	
David Burhans/6565 Frantz Rd./Columbus, Oh 43017
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