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	bgetrune.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	bgetrune.c (635B)
	---
	1 #include "lib9.h"
	2 #include <bio.h>
	3 #include <utf.h>
	4
	5 long
	6 Bgetrune(Biobuf *bp)
	7 {
	8 int c, i;
	9 Rune rune;
	10 char str[UTFmax];
	11
	12 c = Bgetc(bp);
	13 if(c < Runeself) { /* one char */
	14 bp->runesize = 1;
	15 return c;
	16 }
	17 str[0] = c;
	18
	19 for(i=1;;) {
	20 c = Bgetc(bp);
	21 if(c < 0)
	22 return c;
	23 str[i++] = c;
	24
	25 if(fullrune(str, i)) {
	26 bp->runesize = chartorune(&rune, str);
	27 while(i > bp->runesize) {
	28 Bungetc(bp);
	29 i--;
	30 }
	31 return rune;
	32 }
	33 }
	34 }
	35
	36 int
	37 Bungetrune(Biobuf *bp)
	38 {
	39
	40 if(bp->state == Bracteof)
	41 bp->state = Bractive;
	42 if(bp->state != Bractive)
	43 return Beof;
	44 bp->icount -= bp->runesize;
	45 bp->runesize = 0;
	46 return 1;
	47 }