Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/rune4-bio/bgetrune.c.orig

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
Download the Plan 9 distribution.


#include	<u.h>
#include	<libc.h>
#include	<bio.h>

long
Bgetrune(Biobufhdr *bp)
{
	int c, i;
	Rune rune;
	char str[4];

	c = Bgetc(bp);
	if(c < Runeself) {		/* one char */
		bp->runesize = 1;
		return c;
	}
	str[0] = c;

	for(i=1;;) {
		c = Bgetc(bp);
		if(c < 0)
			return c;
		str[i++] = c;

		if(fullrune(str, i)) {
			bp->runesize = chartorune(&rune, str);
			while(i > bp->runesize) {
				Bungetc(bp);
				i--;
			}
			return rune;
		}
	}
}

int
Bungetrune(Biobufhdr *bp)
{

	if(bp->state == Bracteof)
		bp->state = Bractive;
	if(bp->state != Bractive)
		return Beof;
	bp->icount -= bp->runesize;
	bp->runesize = 0;
	return 1;
}

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