usr/src/ucblib/libcurses/addch.c

   1 /*
   2  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
   7 /*        All Rights Reserved   */
   8
   9 /*
  10  * Copyright (c) 1980 Regents of the University of California.
  11  * All rights reserved.  The Berkeley software License Agreement
  12  * specifies the terms and conditions for redistribution.
  13  */
  14
  15 #pragma ident   "%Z%%M% %I%     %E% SMI"
  16
  17 #ifndef lint
  18 static char
  19 sccsid[] = "@(#)addch.c 1.6 88/02/08 SMI"; /* from UCB 5.1 85/06/07 */
  20 #endif  /* not lint */
  21
  22 #include        "curses.ext"
  23
  24 /* forward declaration */
  25 static void set_ch(WINDOW *, int, int, int);
  26
  27 /*
  28  *      This routine adds the character to the current position
  29  */
  30
  31 int
  32 waddch(WINDOW *win, char c)
  33 {
  34         int             x, y;
  35         int             newx;
  36
  37         x = win->_curx;
  38         y = win->_cury;
  39 #ifdef FULLDEBUG
  40         fprintf(outf, "ADDCH('%c') at (%d, %d)\n", c, y, x);
  41 #endif
  42         switch (c) {
  43         case '\t':
  44                 for (newx = x + (8 - (x & 07)); x < newx; x++)
  45                         if (waddch(win, ' ') == ERR)
  46                                 return (ERR);
  47                 return (OK);
  48
  49         default:
  50 #ifdef FULLDEBUG
  51                 fprintf(outf, "ADDCH: 1: y = %d, x = %d, firstch = %d,"
  52                     " lastch = %d\n", y, x, win->_firstch[y],
  53                     win->_lastch[y]);
  54 #endif
  55                 if (win->_flags & _STANDOUT)
  56                         c |= _STANDOUT;
  57                 set_ch(win, y, x, c);
  58                 win->_y[y][x++] = c;
  59                 if (x >= win->_maxx) {
  60                         x = 0;
  61 newline:
  62                         if (++y >= win->_maxy)
  63                                 if (win->_scroll) {
  64                                         (void) scroll(win);
  65                                         --y;
  66                                 }
  67                                 else
  68                                         return (ERR);
  69                 }
  70 #ifdef FULLDEBUG
  71                 fprintf(outf, "ADDCH: 2: y = %d, x = %d, firstch = %d,"
  72                     " lastch = %d\n", y, x, win->_firstch[y],
  73                     win->_lastch[y]);
  74 #endif
  75                 break;
  76         case '\n':
  77                 (void) wclrtoeol(win);
  78                 if (!NONL)
  79                         x = 0;
  80                 goto newline;
  81         case '\r':
  82                 x = 0;
  83                 break;
  84         case '\b':
  85                 if (--x < 0)
  86                         x = 0;
  87                 break;
  88         }
  89         win->_curx = (short)x;
  90         win->_cury = (short)y;
  91         return (OK);
  92 }
  93
  94 /*
  95  * set_ch:
  96  *      Set the first and last change flags for this window.
  97  */
  98
  99 static void
 100 set_ch(WINDOW *win, int y, int x, int ch)
 101 {
 102 #ifdef  FULLDEBUG
 103         fprintf(outf, "SET_CH(%0.2o, %d, %d)\n", win, y, x);
 104 #endif
 105         if (win->_y[y][x] != ch) {
 106                 x += win->_ch_off;
 107                 if (win->_firstch[y] == _NOCHANGE)
 108                         win->_firstch[y] = win->_lastch[y] = (short)x;
 109                 else if (x < win->_firstch[y])
 110                         win->_firstch[y] = (short)x;
 111                 else if (x > win->_lastch[y])
 112                         win->_lastch[y] = (short)x;
 113 #ifdef FULLDEBUG
 114                 fprintf(outf, "SET_CH: change gives f/l: %d/%d [%d/%d]\n",
 115                     win->_firstch[y], win->_lastch[y],
 116                     win->_firstch[y] - win->_ch_off,
 117                     win->_lastch[y] - win->_ch_off);
 118 #endif
 119         }
 120 }