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[unix-history] / usr / src / usr.bin / window / mloop.c

#ifndef lint
static  char *sccsid = "@(#)mloop.c     3.1 83/09/02";
#endif

#include "defs.h"

mloop()
{
       register n;
       register char *p;
       int imask;

       while (!quit) {
               if (!incmd && selwin->ww_state != WWS_HASPROC) {
                       incmd = 1;
                       error("Process died.");
               }
               if (incmd) {
                       docmd();
                       continue;
               }
               /*
                * Loop until we get some keyboard input.
                */
               while (ibufc == 0) {
                       wwcurtowin(selwin);
                       wwupdate();
                       wwflush();
                       while (imask = 1, wwforce(&imask) < 0)
                               ;
                       if ((imask & 1) == 0)
                               continue;
                       /* NOTE: ibufc == 0 */
                       ibufp = ibuf;
                       /* may block */
                       if ((ibufc = read(0, ibuf, sizeof ibuf)) < 0) {
                               ibufc = 0;
                               nreade++;
                       } else if (ibufc == 0)
                               nreadz++;
                       else
                               nreadc += ibufc;
                       nread++;
               }
               /*
                * Weird loop.  Copy the buffer to the pty
                * and stopping on the escape character
                * in a hopefully efficient way.
                * Probably a good thing to make ibufc == 1 a special
                * case.
                */
               for (p = ibufp, n = ibufc;;) {
                       if (--n < 0) {
                               (void) write(selwin->ww_pty, ibufp, ibufc);
                               ibufp = ibuf;
                               ibufc = 0;
                               break;
                       }
                       if (*p++ == escapec) {
                               if ((n = p - ibufp) > 1)
                                       (void) write(selwin->ww_pty,
                                               ibufp, n - 1);
                               ibufp = p;
                               ibufc -= n;
                               incmd = 1;
                               break;
                       }
               }
       }
}