ref: d3da2e1b89f30f404c3d11053680098f1b7bf677
dir: /libbio/bgetrune.c/
#include "lib9.h" #include <bio.h> long Bgetrune(Biobuf *bp) { int c, i; Rune rune; char str[UTFmax]; c = Bgetc(bp); if(c < Runeself) { /* one char */ bp->runesize = 1; return c; } str[0] = c; bp->runesize = 0; for(i=1;;) { c = Bgetc(bp); if(c < 0) return c; if (i >= sizeof str) return Runeerror; str[i++] = c; if(fullrune(str, i)) { /* utf is long enough to be a rune, but could be bad. */ bp->runesize = chartorune(&rune, str); if (rune == Runeerror) bp->runesize = 0; /* push back nothing */ else /* push back bytes unconsumed by chartorune */ for(; i > bp->runesize; i--) Bungetc(bp); return rune; } } } int Bungetrune(Biobuf *bp) { if(bp->state == Bracteof) bp->state = Bractive; if(bp->state != Bractive) return Beof; bp->icount -= bp->runesize; bp->runesize = 0; return 1; }