From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <ee9e417a050201170652f61fcd@mail.gmail.com>
Date: Tue,  1 Feb 2005 20:06:36 -0500
From: Russ Cox <russcox@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] Brdline
In-Reply-To: <dd5dca40f6611c422e2dcefcf37a3564@ar.aichi-u.ac.jp>
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References: <dd5dca40f6611c422e2dcefcf37a3564@ar.aichi-u.ac.jp>
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try using Brdstr instead.



On Wed, 2 Feb 2005 09:37:14 +0900, arisawa@ar.aichi-u.ac.jp
<arisawa@ar.aichi-u.ac.jp> wrote:
> Hello,
>
> The following program falls into endless loop if we execute
>         echo -n alice | 8.out
> Try.
>
> #include <u.h>
> #include <libc.h>
> #include <bio.h>
>
> void
> main()
> {       Biobuf in;
>         char *p;
>         int lines;
>         Binit(&in, 0, OREAD);
>         lines = 0;
>         for(;;){
>                 p = Brdline(&in, '\n');
>                 if(p == nil){
>                         if(Blinelen(&in) == 0)
>                                 break;
>                 }else
>                         lines++;
>         }
>         print("lines=%d\n",lines);
> }
>
> I have been desired to have such a Brdline
> that can work even if we execute:
>         echo -n alice | 8.out
>
> Current Brdline requires delim as second argument,
> and the worse the delim is left untouched *mostly*
> at Blinelen -1
> We must replace it using Blinelen by '\0' if we want the
> returned value to be used as string.
> This makes program difficult if input data doesn't have delim.
>
> My imagination of new Brdline (or some other name) is:
>
> void
> main()
> {       Biobuf in;
>         char *p;
>         Binit(&in,0,OREAD);
>         while((p = Brdline(&in)))
>                 print("%s", p);
> }
>
> '\n' is automatically replaced by '\0',
> and '\0' is automatically appended at EOF.
> p is nil only at EOF.
> some function will be required to detect buffer full.
> if buffer full the next Brdline should return the
> pointer of the character that is replaced by '\0'
> after fixing the value.
>
> Kenji Arisawa
>