minix/lib/libcurses/newwin.c

144 lines
4.4 KiB
C

#include <stdlib.h>
#include <curses.h>
#include "curspriv.h"
/****************************************************************/
/* Makenew() allocates all data for a new window except the */
/* Actual lines themselves. */
/****************************************************************/
_PROTOTYPE(static WINDOW *makenew, (int nlines, int ncols, int begy,int begx));
static WINDOW *makenew(num_lines, num_columns, begy, begx)
int num_lines, num_columns, begy, begx;
{
int i;
WINDOW *win;
/* Allocate the window structure itself */
if ((win = (WINDOW *) malloc(sizeof(WINDOW))) == NULL)
return((WINDOW *) ERR);
/* Allocate the line pointer array */
if ((win->_line = (int **) calloc(num_lines, sizeof(int *))) == NULL) {
free(win);
return((WINDOW *) ERR);
}
/* Allocate the minchng and maxchng arrays */
if ((win->_minchng = (int *) calloc(num_lines, sizeof(int))) == NULL) {
free(win->_line);
free(win);
return((WINDOW *) ERR);
}
if ((win->_maxchng = (int *) calloc(num_lines, sizeof(int))) == NULL) {
free(win->_line);
free(win->_minchng);
free(win);
return((WINDOW *) ERR);
}
/* Initialize window variables */
win->_curx = 0;
win->_cury = 0;
win->_maxy = num_lines - 1;
win->_maxx = num_columns - 1;
win->_begy = begy;
win->_begx = begx;
win->_flags = 0;
win->_attrs = ATR_NRM;
win->_tabsize = 8;
win->_clear = FALSE;
win->_leave = FALSE;
win->_scroll = FALSE;
win->_nodelay = FALSE;
win->_keypad = FALSE;
win->_regtop = 0;
win->_regbottom = num_lines - 1;
/* Init to say window unchanged */
for (i = 0; i < num_lines; i++) {
win->_minchng[i] = 0;
win->_maxchng[i] = num_columns - 1;
}
/* Set flags for window properties */
if ((begy + num_lines) == LINES) {
win->_flags |= _ENDLINE;
if ((begx == 0) && (num_columns == COLS) && (begy == 0))
win->_flags |= _FULLWIN;
} /* if */
if (((begy + num_lines) == LINES) && ((begx + num_columns) == COLS))
win->_flags |= _SCROLLWIN;
return(win);
}
/****************************************************************/
/* Newwin() creates a new window with size num_lines * num_co- */
/* Lumns, and origin begx,begy relative to the SCREEN. Special */
/* Case: if num_lines and/or num_columns is 0, the remainder of */
/* The screen is used. */
/****************************************************************/
WINDOW *newwin(num_lines, num_columns, begy, begx)
int num_lines, num_columns, begy, begx;
{
WINDOW *win;
int *ptr;
int i, j;
if (num_lines == 0) num_lines = LINES - begy;
if (num_columns == 0) num_columns = COLS - begx;
if ((win = makenew(num_lines, num_columns, begy, begx)) == (WINDOW *) ERR)
return((WINDOW *) ERR);
for (i = 0; i < num_lines; i++) { /* make and clear the lines */
if ((win->_line[i] = (int *)calloc(num_columns, sizeof(int))) == NULL){
for (j = 0; j < i; j++) /* if error, free all the data */
free(win->_line[j]);
free(win->_minchng);
free(win->_maxchng);
free(win->_line);
free(win);
return((WINDOW *) ERR);
} else {
for (ptr = win->_line[i]; ptr < win->_line[i] + num_columns;)
*ptr++ = ' ' | ATR_NRM;
}
}
return(win);
}
/****************************************************************/
/* Subwin() creates a sub-window in the 'orig' window, with */
/* Size num_lines * num_columns, and with origin begx, begy */
/* Relative to the SCREEN. Special case: if num_lines and/or */
/* Num_columns is 0, the remainder of the original window is */
/* Used. The subwindow uses the original window's line buffers */
/* To store it's own lines. */
/****************************************************************/
WINDOW *subwin(orig, num_lines, num_columns, begy, begx)
WINDOW *orig;
int num_lines, num_columns, begy, begx;
{
WINDOW *win;
int i, j, k;
/* Make sure window fits inside the original one */
if (begy < orig->_begy || begx < orig->_begx ||
(begy + num_lines) > (orig->_begy + orig->_maxy) ||
(begx + num_columns) > (orig->_begx + orig->_maxx) )
return((WINDOW *) ERR);
if (num_lines == 0) num_lines = orig->_maxy - (begy - orig->_begy);
if (num_columns == 0) num_columns = orig->_maxx - (begx - orig->_begx);
if ((win = makenew(num_lines, num_columns, begy, begx)) == (WINDOW *) ERR)
return((WINDOW *) ERR);
/* Set line pointers the same as in the original window */
j = begy - orig->_begy;
k = begx - orig->_begx;
for (i = 0; i < num_lines; i++) win->_line[i] = (orig->_line[j++]) + k;
win->_flags |= _SUBWIN;
return(win);
}