ttyputc.c File Reference

#include <xinu.h>

Include dependency graph for ttyputc.c:

Go to the source code of this file.

Functions
devcall	ttyputc (struct dentry *devptr, char ch)

Function Documentation

ttyputc()

devcall ttyputc	(	struct dentry *	devptr,
		char	ch
	)

Definition at line 9 of file ttyputc.c.

References dentry::dvcsr, dentry::dvminor, OK, ttykickout(), ttytab, TY_NEWLINE, TY_OBUFLEN, TY_RETURN, ttycblk::tyobuff, ttycblk::tyocrlf, ttycblk::tyosem, ttycblk::tyotail, and wait().

Referenced by ttywrite().

{
    struct  ttycblk *typtr;     /* Pointer to tty control block */

    typtr = &ttytab[devptr->dvminor];

    /* Handle output CRLF by sending CR first */

        if ( ch==TY_NEWLINE && typtr->tyocrlf ) {
                ttyputc(devptr, TY_RETURN);
    }

    wait(typtr->tyosem);        /* Wait for space in queue */
    *typtr->tyotail++ = ch;

    /* Wrap around to beginning of buffer, if needed */

    if (typtr->tyotail >= &typtr->tyobuff[TY_OBUFLEN]) {
        typtr->tyotail = typtr->tyobuff;
    }

    /* Start output in case device is idle */

    ttykickout((struct uart_csreg *)devptr->dvcsr);

    return OK;
}

Here is the call graph for this function:

Here is the caller graph for this function: