From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <22e43e02e32dd37beb7f8c52105e45b6@quintile.net>
From: "Steve Simon" <steve@quintile.net>
Date: Wed, 19 Sep 2012 09:48:51 +0100
To: 9fans@9fans.net
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Subject: [9fans] Brdline() and continuation lines
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Hi,

Anyone worked out an idiom that would allow me to
use Brdline()/Blinelen() to read a file which
contains continuation lines?

I want to read a text file which consists of lines terminated
by newlines, but lines with leading whitespace are considered
to be continuation lines.

Brdline() is very neat allowing me to parse input lines inside the
Biobuf buffer without copying them to "user space", however if I
do a Brdline(), get a line and then attempt to do another Brdline()
I am in danger of releaseing the buffer space used by the first read.

I am happy if the answer is "Brdline() cannot do this", I just feel like
I am missing a trick, and there is elegant solution.

-Steve



From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@quanstro.net>
Date: Wed, 19 Sep 2012 09:35:51 -0400
To: 9fans@9fans.net
Message-ID: <18674d790afd2a7602091b8d8e704712@brasstown.quanstro.net>
In-Reply-To: <22e43e02e32dd37beb7f8c52105e45b6@quintile.net>
References: <22e43e02e32dd37beb7f8c52105e45b6@quintile.net>
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Subject: Re: [9fans] Brdline() and continuation lines
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> Anyone worked out an idiom that would allow me to
> use Brdline()/Blinelen() to read a file which
> contains continuation lines?
>
> I want to read a text file which consists of lines terminated
> by newlines, but lines with leading whitespace are considered
> to be continuation lines.
>
> Brdline() is very neat allowing me to parse input lines inside the
> Biobuf buffer without copying them to "user space", however if I
> do a Brdline(), get a line and then attempt to do another Brdline()
> I am in danger of releaseing the buffer space used by the first read.
>
> I am happy if the answer is "Brdline() cannot do this", I just feel like
> I am missing a trick, and there is elegant solution.

/*
 * Bgetrune seems like overkill, but avoids passing up bad runes.
 */
int
Brdlinec(Biobuf *b, char *s, char *e)
{
	char *p;
	int x, slash;
	Rune r;

	for(p = s; e-p > UTFmax+1;){
		x = Bgetrune(b);
		if(x == -1)
			return -1;
		r = x;
		if(r == '\\'){
			x = Bgetrune(b);
			if(x == -1)
				return -1;
			if(x == '\n')
				continue;
			p += runetochar(p, &r);
			r = x;
		}else if(r == '\n')
			break;
		p += runetochar(p, r);
	}
	*p = 0;
	return p-e;
}




From mboxrd@z Thu Jan  1 00:00:00 1970
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References: <22e43e02e32dd37beb7f8c52105e45b6@quintile.net>
Date: Wed, 19 Sep 2012 14:49:25 +0100
Message-ID: <CAOw7k5g4JEeevnc2zY0yKFDfMA4LLETvPETOnHurp9QYoKgeXQ@mail.gmail.com>
From: Charles Forsyth <charles.forsyth@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] Brdline() and continuation lines
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I don't see how it can do it.

On 19 September 2012 09:48, Steve Simon <steve@quintile.net> wrote:

> I am happy if the answer is "Brdline() cannot do this", I just feel like
> I am missing a trick, and there is elegant solution.
>

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I don&#39;t see how it can do it.<div><br><div class="gmail_quote">On 19 September 2012 09:48, Steve Simon <span dir="ltr">&lt;<a href="mailto:steve@quintile.net" target="_blank">steve@quintile.net</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div id=":198">I am happy if the answer is &quot;Brdline() cannot do this&quot;, I just feel like<br>
I am missing a trick, and there is elegant solution.</div></blockquote></div><br></div>

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