63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.h>
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#include <bio.h>
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int32_t
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Bgetrune(Biobufhdr *bp)
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{
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int c, i;
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Rune rune;
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char str[UTFmax];
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c = Bgetc(bp);
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if(c < Runeself) { /* one char */
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bp->runesize = 1;
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return c;
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}
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str[0] = c;
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bp->runesize = 0;
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for(i=1;;) {
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c = Bgetc(bp);
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if(c < 0)
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return c;
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if (i >= sizeof str)
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return Runeerror;
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str[i++] = c;
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if(fullrune(str, i)) {
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/* utf is long enough to be a rune, but could be bad. */
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bp->runesize = chartorune(&rune, str);
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if (rune == Runeerror)
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bp->runesize = 0; /* push back nothing */
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else
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/* push back bytes unconsumed by chartorune */
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for(; i > bp->runesize; i--)
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Bungetc(bp);
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return rune;
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}
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}
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}
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int
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Bungetrune(Biobufhdr *bp)
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{
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if(bp->state == Bracteof)
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bp->state = Bractive;
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if(bp->state != Bractive)
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return Beof;
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bp->icount -= bp->runesize;
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bp->runesize = 0;
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return 1;
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}
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