usr/src/ucblib/libcurses/newwin.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 /*LINTLIBRARY*/
  18
  19 #ifndef lint
  20 static char
  21 sccsid[] = "@(#)newwin.c 1.7 89/07/13 SMI"; /* from UCB 5.1 85/06/07 */
  22 #endif  /* not lint */
  23
  24 /*
  25  * allocate space for and set up defaults for a new window
  26  *
  27  */
  28
  29 #include        "curses.ext"
  30 #include        <malloc.h>
  31
  32 #define SMALLOC (short *)malloc
  33
  34 /* forward declaration */
  35 static WINDOW *makenew(int, int, int, int);
  36
  37 #undef          nl      /* don't need it here, and it interferes        */
  38
  39 WINDOW *
  40 newwin(int num_lines, int num_cols, int begy, int begx)
  41 {
  42         WINDOW  *win;
  43         char    *sp;
  44         int     i, by, bx, nl, nc;
  45         int     j;
  46
  47         by = begy;
  48         bx = begx;
  49         nl = num_lines;
  50         nc = num_cols;
  51
  52         if (nl == 0)
  53                 nl = LINES - by;
  54         if (nc == 0)
  55                 nc = COLS - bx;
  56         if ((win = makenew(nl, nc, by, bx)) == NULL)
  57                 return (ERR);
  58         if ((win->_firstch = SMALLOC(nl * sizeof (win->_firstch[0]))) == NULL) {
  59                 free(win->_y);
  60                 free(win);
  61                 return (NULL);
  62         }
  63         if ((win->_lastch = SMALLOC(nl * sizeof (win->_lastch[0]))) == NULL) {
  64                 free(win->_y);
  65                 free(win->_firstch);
  66                 free(win);
  67                 return (NULL);
  68         }
  69         win->_nextp = win;
  70         for (i = 0; i < nl; i++) {
  71                 win->_firstch[i] = _NOCHANGE;
  72                 win->_lastch[i] = _NOCHANGE;
  73         }
  74         for (i = 0; i < nl; i++)
  75                 if ((win->_y[i] = malloc(nc * sizeof (win->_y[0]))) == NULL) {
  76                         for (j = 0; j < i; j++)
  77                                 free(win->_y[j]);
  78                         free(win->_firstch);
  79                         free(win->_lastch);
  80                         free(win->_y);
  81                         free(win);
  82                         return (ERR);
  83                 }
  84                 else
  85                         for (sp = win->_y[i]; sp < win->_y[i] + nc; )
  86                                 *sp++ = ' ';
  87         win->_ch_off = 0;
  88 #ifdef DEBUG
  89         fprintf(outf, "NEWWIN: win->_ch_off = %d\n", win->_ch_off);
  90 #endif
  91         return (win);
  92 }
  93
  94 WINDOW *
  95 subwin(WINDOW *orig, int num_lines, int num_cols, int begy, int begx)
  96 {
  97         WINDOW  *win;
  98         int     by, bx, nl, nc;
  99
 100         by = begy;
 101         bx = begx;
 102         nl = num_lines;
 103         nc = num_cols;
 104
 105         /*
 106          * make sure window fits inside the original one
 107          */
 108 #ifdef  DEBUG
 109         fprintf(outf, "SUBWIN(%0.2o, %d, %d, %d, %d)\n", orig, nl, nc, by, bx);
 110 #endif
 111         if (by < orig->_begy || bx < orig->_begx ||
 112             by + nl > orig->_maxy + orig->_begy ||
 113             bx + nc > orig->_maxx + orig->_begx)
 114                 return (ERR);
 115         if (nl == 0)
 116                 nl = orig->_maxy + orig->_begy - by;
 117         if (nc == 0)
 118                 nc = orig->_maxx + orig->_begx - bx;
 119         if ((win = makenew(nl, nc, by, bx)) == NULL)
 120                 return (ERR);
 121         win->_nextp = orig->_nextp;
 122         orig->_nextp = win;
 123         win->_orig = orig;
 124         _set_subwin_(orig, win);
 125         return (win);
 126 }
 127
 128 /*
 129  * this code is shared with mvwin()
 130  */
 131
 132 void
 133 _set_subwin_(WINDOW *orig, WINDOW *win)
 134 {
 135         int     i, j, k;
 136
 137         j = win->_begy - orig->_begy;
 138         k = win->_begx - orig->_begx;
 139         win->_ch_off = (short)k;
 140 #ifdef DEBUG
 141         fprintf(outf, "_SET_SUBWIN_: win->_ch_off = %d\n", win->_ch_off);
 142 #endif
 143         win->_firstch = &orig->_firstch[j];
 144         win->_lastch = &orig->_lastch[j];
 145         for (i = 0; i < win->_maxy; i++, j++)
 146                 win->_y[i] = &orig->_y[j][k];
 147
 148 }
 149
 150 /*
 151  *      This routine sets up a window buffer and returns a pointer to it.
 152  */
 153
 154 static WINDOW *
 155 makenew(int num_lines, int num_cols, int begy, int begx)
 156 {
 157         WINDOW  *win;
 158         int     by, bx, nl, nc;
 159
 160         by = begy;
 161         bx = begx;
 162         nl = num_lines;
 163         nc = num_cols;
 164
 165 #ifdef  DEBUG
 166         fprintf(outf, "MAKENEW(%d, %d, %d, %d)\n", nl, nc, by, bx);
 167 #endif
 168         if ((win = (WINDOW *) malloc(sizeof (*win))) == NULL)
 169                 return (NULL);
 170 #ifdef DEBUG
 171         fprintf(outf, "MAKENEW: nl = %d\n", nl);
 172 #endif
 173         if ((win->_y = (char **)malloc(nl * sizeof (win->_y[0]))) == NULL) {
 174                 free(win);
 175                 return (NULL);
 176         }
 177 #ifdef DEBUG
 178         fprintf(outf, "MAKENEW: nc = %d\n", nc);
 179 #endif
 180         win->_cury = win->_curx = 0;
 181         win->_clear = FALSE;
 182         win->_maxy = (short)nl;
 183         win->_maxx = (short)nc;
 184         win->_begy = (short)by;
 185         win->_begx = (short)bx;
 186         win->_flags = 0;
 187         win->_scroll = win->_leave = FALSE;
 188         _swflags_(win);
 189         win->_orig = NULL;
 190 #ifdef DEBUG
 191         fprintf(outf, "MAKENEW: win->_clear = %d\n", win->_clear);
 192         fprintf(outf, "MAKENEW: win->_leave = %d\n", win->_leave);
 193         fprintf(outf, "MAKENEW: win->_scroll = %d\n", win->_scroll);
 194         fprintf(outf, "MAKENEW: win->_flags = %0.2o\n", win->_flags);
 195         fprintf(outf, "MAKENEW: win->_maxy = %d\n", win->_maxy);
 196         fprintf(outf, "MAKENEW: win->_maxx = %d\n", win->_maxx);
 197         fprintf(outf, "MAKENEW: win->_begy = %d\n", win->_begy);
 198         fprintf(outf, "MAKENEW: win->_begx = %d\n", win->_begx);
 199 #endif
 200         return (win);
 201 }
 202
 203 void
 204 _swflags_(WINDOW *win)
 205 {
 206         win->_flags &= ~(_ENDLINE|_FULLLINE|_FULLWIN|_SCROLLWIN);
 207         if (win->_begx + win->_maxx == COLS) {
 208                 win->_flags |= _ENDLINE;
 209                 if (win->_begx == 0) {
 210                         if (AL && DL)
 211                                 win->_flags |= _FULLLINE;
 212                         if (win->_maxy == LINES && win->_begy == 0)
 213                                 win->_flags |= _FULLWIN;
 214                 }
 215                 if (win->_begy + win->_maxy == LINES)
 216                         win->_flags |= _SCROLLWIN;
 217         }
 218 }