do not put '\n' characters into the screen data structures

[unix-history] / usr / src / lib / libcurses / addbytes.c

/*
* Copyright (c) 1987 Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)addbytes.c  5.19 (Berkeley) %G%";
#endif  /* not lint */

#include <curses.h>
#include <termios.h>

#define SYNCH_IN        {y = win->cury; x = win->curx;}
#define SYNCH_OUT       {win->cury = y; win->curx = x;}

int
waddbytes(win, bytes, count)
       WINDOW *win;
       const char *bytes;
       int count;
{
       __waddbytes(win, bytes, count, 0);
}

/*
* waddbytes --
*      Add the character to the current position in the given window.
*/
int
__waddbytes(win, bytes, count, so)
       register WINDOW *win;
       register const char *bytes;
       register int count;
       int so;
{
       static char blanks[] = "        ";
       register int c, newx, x, y;
       char stand;
       __LINE *lp;

       SYNCH_IN;

#ifdef DEBUG
       __TRACE("ADDBYTES('%c') at (%d, %d)\n", c, y, x);
#endif
       while (count--) {
               c = *bytes++;
               switch (c) {
               case '\t':
                       SYNCH_OUT;
                       if (waddbytes(win, blanks, 8 - (x % 8)) == ERR)
                               return (ERR);
                       SYNCH_IN;
                       break;

               default:
#ifdef DEBUG
       __TRACE("ADDBYTES(%0.2o, %d, %d)\n", win, y, x);
#endif
                       
                       lp = win->lines[y];
                       if (lp->flags & __ISPASTEOL) {
                               lp->flags &= ~__ISPASTEOL;
newline:                        if (y == win->maxy - 1) {
                                       if (win->flags & __SCROLLOK) {
                                               SYNCH_OUT;
                                               scroll(win);
                                               SYNCH_IN;
                                               lp = win->lines[y];
                                               x = 0;
                                       } 
                               } else {
                                       y++;
                                       lp = win->lines[y];
                                       x = 0;
                               }
                               if (c == '\n')
                                       break;
                       }
                               
                       stand = '\0';
                       if (win->flags & __WSTANDOUT || so)
                               stand |= __STANDOUT;
#ifdef DEBUG
       __TRACE("ADDBYTES: 1: y = %d, x = %d, firstch = %d, lastch = %d\n",
           y, x, *win->lines[y]->firstchp, *win->lines[y]->lastchp);
#endif
                       if (lp->line[x].ch != c || 
                           !(lp->line[x].attr & stand)) {
                               newx = x + win->ch_off;
                               if (!(lp->flags & __ISDIRTY)) {
                                       lp->flags |= __ISDIRTY;
                                       *lp->firstchp = *lp->lastchp = newx;
                               }
                               else if (newx < *lp->firstchp)
                                       *lp->firstchp = newx;
                               else if (newx > *lp->lastchp)
                                       *lp->lastchp = newx;
#ifdef DEBUG
       __TRACE("ADDBYTES: change gives f/l: %d/%d [%d/%d]\n",
           *lp->firstchp, *lp->lastchp,
           *lp->firstchp - win->ch_off,
           *lp->lastchp - win->ch_off);
#endif
                       }
                       lp->line[x].ch = c;
                       if (stand)
                               lp->line[x].attr |= __STANDOUT;
                       else
                               lp->line[x].attr &= ~__STANDOUT;
                       if (x == win->maxx - 1)
                               lp->flags |= __ISPASTEOL;
                       else
                               x++;
#ifdef DEBUG
       __TRACE("ADDBYTES: 2: y = %d, x = %d, firstch = %d, lastch = %d\n",
           y, x, *win->lines[y]->firstchp, *win->lines[y]->lastchp);
#endif
                       break;
               case '\n':
                       SYNCH_OUT;
                       wclrtoeol(win);
                       SYNCH_IN;
                       if (__orig_termios.c_oflag & ONLCR)
                               x = 0;
                       goto newline;
               case '\r':
                       x = 0;
                       break;
               case '\b':
                       if (--x < 0)
                               x = 0;
                       break;
               }
       }
       SYNCH_OUT;
       return (OK);
}