[9fans] Brdline

[arisawa@ar.aichi-u.ac.jp]

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