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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- #include <u.h>
- #include <libc.h>
- #include <bio.h>
- int32_t
- Bgetrune(Biobufhdr *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(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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