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Annotation of lucent/sys/src/boot/pc/queue.c, revision 1.1

1.1     ! root        1: #include       "u.h"
        !             2: #include       "lib.h"
        !             3: #include       "mem.h"
        !             4: #include       "dat.h"
        !             5: #include       "fns.h"
        !             6: #include       "io.h"
        !             7: 
        !             8: int
        !             9: qgetc(IOQ *q)
        !            10: {
        !            11:        int c;
        !            12: 
        !            13:        if(q->in == q->out)
        !            14:                return -1;
        !            15:        c = *q->out;
        !            16:        if(q->out == q->buf+sizeof(q->buf)-1)
        !            17:                q->out = q->buf;
        !            18:        else
        !            19:                q->out++;
        !            20:        return c;
        !            21: }
        !            22: 
        !            23: static int
        !            24: qputc(IOQ *q, int c)
        !            25: {
        !            26:        uchar *nextin;
        !            27:        if(q->in >= &q->buf[sizeof(q->buf)-1])
        !            28:                nextin = q->buf;
        !            29:        else
        !            30:                nextin = q->in+1;
        !            31:        if(nextin == q->out)
        !            32:                return -1;
        !            33:        *q->in = c;
        !            34:        q->in = nextin;
        !            35:        return 0;
        !            36: }
        !            37: 
        !            38: void
        !            39: qinit(IOQ *q)
        !            40: {
        !            41:        q->in = q->out = q->buf;
        !            42:        q->getc = qgetc;
        !            43:        q->putc = qputc;
        !            44: }

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