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resize.c revision 1.5 
      1 /*	$NetBSD: resize.c,v 1.5 2002/12/23 12:18:53 jdc Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2001
      5  *	Brett Lymn.
      6  *
      7  * This code has been donated to The NetBSD Foundation by the Author.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Berkeley and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 #ifndef lint
     40 #if 0
     41 static char sccsid[] = "@(#)resize.c   blymn 2001/08/26";
     42 #else
     43 __RCSID("$NetBSD: resize.c,v 1.5 2002/12/23 12:18:53 jdc Exp $");
     44 #endif
     45 #endif				/* not lint */
     46 
     47 #include <stdlib.h>
     48 
     49 #include "curses.h"
     50 #include "curses_private.h"
     51 
     52 extern struct __winlist	*winlistp;
     53 
     54 static int __resizewin(WINDOW *win, int nlines, int ncols);
     55 
     56 /*
     57  * wresize --
     58  *	Resize the given window to the new size.
     59  */
     60 int
     61 wresize(WINDOW *win, int nlines, int ncols)
     62 {
     63 	__LINE *lp;
     64 	int     i, j;
     65 	__LDATA *sp;
     66 
     67 	if ((win == NULL) || (nlines < 0) || (ncols < 0))
     68 		return ERR;
     69 
     70 	if (win->orig == NULL) {
     71 		if (nlines == 0)
     72 			nlines = LINES - win->begy;
     73 		if (ncols == 0)
     74 			ncols = COLS - win->begx;
     75 	} else {
     76 		  /* subwins must fit inside the parent - check this */
     77 		if ((nlines == 0)
     78 		    || (nlines > (win->orig->maxy + win->orig->begy
     79 				  - win->begy)))
     80 			nlines = win->orig->maxy + win->orig->begy - win->begy;
     81 
     82 		if ((ncols == 0)
     83 		    || (ncols > (win->orig->maxx + win->orig->begx
     84 				 - win->begx)))
     85 			ncols = win->orig->maxx + win->orig->begx - win->begx;
     86 	}
     87 
     88 	if ((__resizewin(win, nlines, ncols)) == ERR)
     89 		return ERR;
     90 
     91 	  /*
     92 	   * we must zot the window contents otherwise lines may pick
     93 	   * up attributes from the previous line when the window is
     94 	   * made smaller.  The client will redraw the window anyway
     95 	   * so this is no big deal.
     96 	   */
     97 	for (i = 0; i < win->maxy; i++) {
     98 		lp = win->lines[i];
     99 		for (sp = lp->line, j = 0; j < win->maxx;
    100 		     j++, sp++) {
    101 			sp->ch = ' ';
    102 			sp->bch = ' ';
    103 			sp->attr = 0;
    104 			sp->battr = 0;
    105 		}
    106 		lp->hash = __hash((char *)(void *)lp->line,
    107 				  (size_t) (ncols * __LDATASIZE));
    108 	}
    109 
    110 	return OK;
    111 }
    112 
    113 /*
    114  * resizeterm --
    115  *      Resize the terminal window, resizing the dependent windows.
    116  */
    117 int
    118 resizeterm(int nlines, int ncols)
    119 {
    120 	WINDOW *win;
    121 	struct __winlist *list;
    122 	int newlines, newcols, ldelta, cdelta;
    123 
    124 	  /* don't worry if things have not changed... we would like to
    125 	     do this but some bastard programs update LINES and COLS before
    126 	     calling resizeterm thus negating it's effect.
    127 	if ((nlines == LINES) && (ncols == COLS))
    128 	return OK;*/
    129 
    130 #ifdef	DEBUG
    131 	__CTRACE("resizeterm: (%d, %d)\n", nlines, ncols);
    132 #endif
    133 
    134 	ldelta = nlines - __virtscr->maxy;
    135 	cdelta = ncols - __virtscr->maxx;
    136 
    137 	for (list = __winlistp; list != NULL; list = list->nextp) {
    138 		win = list->winp;
    139 		newlines = win->maxy;
    140 		newcols = win->maxx;
    141 
    142 		if (win->begy >= (nlines - 1)) {
    143 			win->begy = nlines - win->maxx - 1;
    144 			if (win->begy < 0)
    145 				win->begy = 0;
    146 		}
    147 
    148 
    149 		if ((newlines + win->begy + ldelta) == nlines)
    150 				newlines = nlines;
    151 
    152 		if (newlines > nlines) {
    153 			newlines = nlines - win->begy;
    154 			if (newlines < 0)
    155 				newlines = 1;
    156 		}
    157 
    158 		if ((newcols + win->begx + cdelta) == ncols)
    159 			newcols = ncols;
    160 
    161 		if (newcols > ncols) {
    162 			newcols = ncols - win->begx;
    163 			if (newcols < 0)
    164 				newcols = 1;
    165 		}
    166 
    167 		if (wresize(win, newlines, newcols) != OK)
    168 			return ERR;
    169 	}
    170 
    171 	LINES = nlines;
    172 	COLS = ncols;
    173 
    174 	  /* tweak the flags now that we have updated the LINES and COLS */
    175 	for (list = __winlistp; list != NULL; list = list->nextp) {
    176 		if (!win->flags & __ISPAD)
    177 			__swflags(list->winp);
    178 	}
    179 
    180 	wrefresh(curscr);
    181 	return OK;
    182 }
    183 
    184 /*
    185  * __resizewin --
    186  *	Resize the given window.
    187  */
    188 static int
    189 __resizewin(WINDOW *win, int nlines, int ncols)
    190 {
    191 	__LINE			*lp, *olp, **newlines, *newlspace;
    192 	__LDATA                 *newwspace;
    193 	int			 i;
    194 
    195 #ifdef	DEBUG
    196 	__CTRACE("resize: (%d, %d)\n", nlines, ncols);
    197 	__CTRACE("resize: win->wattr = %0.2o\n", win->wattr);
    198 	__CTRACE("resize: win->flags = %0.2o\n", win->flags);
    199 	__CTRACE("resize: win->maxy = %d\n", win->maxy);
    200 	__CTRACE("resize: win->maxx = %d\n", win->maxx);
    201 	__CTRACE("resize: win->begy = %d\n", win->begy);
    202 	__CTRACE("resize: win->begx = %d\n", win->begx);
    203 	__CTRACE("resize: win->scr_t = %d\n", win->scr_t);
    204 	__CTRACE("resize: win->scr_b = %d\n", win->scr_b);
    205 #endif
    206 
    207 	/* Reallocate line pointer array and line space. */
    208 	if ((newlines = realloc(win->lines,
    209 				nlines * sizeof(__LINE *))) == NULL) {
    210 		return ERR;
    211 	}
    212 	win->lines = newlines;
    213 
    214 	if ((newlspace = realloc(win->lspace,
    215 				 nlines * sizeof(__LINE))) == NULL) {
    216 		return ERR;
    217 	}
    218 	win->lspace = newlspace;
    219 
    220 	/* Don't allocate window and line space if it's a subwindow */
    221 	if (win->orig == NULL) {
    222 		/*
    223 		 * Allocate window space in one chunk.
    224 		 */
    225 		if ((newwspace =
    226 			realloc(win->wspace,
    227 				ncols * nlines * sizeof(__LDATA))) == NULL) {
    228 			return ERR;
    229 		}
    230 
    231 		win->wspace = newwspace;
    232 
    233 		/*
    234 		 * Point line pointers to line space, and lines themselves into
    235 		 * window space.
    236 		 */
    237 		for (lp = win->lspace, i = 0; i < nlines; i++, lp++) {
    238 			win->lines[i] = lp;
    239 			lp->line = &win->wspace[i * ncols];
    240 #ifdef DEBUG
    241 			lp->sentinel = SENTINEL_VALUE;
    242 #endif
    243 			lp->firstchp = &lp->firstch;
    244 			lp->lastchp = &lp->lastch;
    245 			lp->firstch = 0;
    246 			lp->lastch = ncols - 1;
    247 			lp->flags = __ISDIRTY;
    248 		}
    249 	} else {
    250 
    251 		win->ch_off = win->begx - win->orig->begx;
    252 		  /* Point line pointers to line space. */
    253 		for (lp = win->lspace, i = 0; i < nlines; i++, lp++) {
    254 			win->lines[i] = lp;
    255 			olp = win->orig->lines[i + win->begy
    256 					      - win->orig->begy];
    257 			lp->line = &olp->line[win->ch_off];
    258 			lp->firstchp = &olp->firstch;
    259 			lp->lastchp = &olp->lastch;
    260 			lp->hash = __hash((char *)(void *)lp->line,
    261 					  (size_t) (win->maxx * __LDATASIZE));
    262 			lp->flags = __ISDIRTY;
    263 		}
    264 	}
    265 
    266 
    267 	win->cury = win->curx = 0;
    268 	win->maxy = nlines;
    269 	win->maxx = ncols;
    270 	win->scr_b = win->maxy - 1;
    271 	__swflags(win);
    272 
    273 #ifdef DEBUG
    274 	__CTRACE("resize: win->wattr = %0.2o\n", win->wattr);
    275 	__CTRACE("resize: win->flags = %0.2o\n", win->flags);
    276 	__CTRACE("resize: win->maxy = %d\n", win->maxy);
    277 	__CTRACE("resize: win->maxx = %d\n", win->maxx);
    278 	__CTRACE("resize: win->begy = %d\n", win->begy);
    279 	__CTRACE("resize: win->begx = %d\n", win->begx);
    280 	__CTRACE("resize: win->scr_t = %d\n", win->scr_t);
    281 	__CTRACE("resize: win->scr_b = %d\n", win->scr_b);
    282 #endif
    283 	return OK;
    284 }
    285 
    286