Subversion Repositories planix.SVN

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

long
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;
}