putc.c

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#include <xinu.h>

syscall putc(did32 descrp, char ch)
{
    intmask mask;          /* Saved interrupt mask      */
    struct dentry *devptr; /* Entry in device switch table  */
    int32 retval;          /* Value to return to caller */

    mask = disable();
    if (isbaddev(descrp))
    {
        restore(mask);
        return SYSERR;
    }
    devptr = (struct dentry *)&devtab[descrp];
    retval = (*devptr->dvputc)(devptr, ch);
    restore(mask);
    return retval;
}