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C!T ROM 2
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ctrom_ii_b
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PROGRAM
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C
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AECUR101
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NEWWIN.C
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C/C++ Source or Header
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1990-03-08
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4KB
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159 lines
/*------------------------------------------------------------
*
* newwin.c
*
* copyright (c) 1987,88,89,90 J. Alan Eldridge
*
* create new windows and subwindows
*
* NOTE: SUB-WINDOWS MUST BE WHOLLY CONTAINED WITHIN THEIR
* PARENT WINDOWS OR ALLOCATION FAILS!
*
*----------------------------------------------------------*/
#include "curses.h"
WINDOW *
newwin(r,c,y,x)
{
WINDOW *win;
void *ptrs[4];
int row;
VIDCHR fillch;
if (r == 0)
r = LINES - y;
if (c == 0)
c = COLS - x;
ptrs[0] = calloc(1, sizeof(WINDOW));
ptrs[1] = calloc(r, sizeof(VIDCHR *));
ptrs[2] = calloc(r, sizeof(int));
ptrs[3] = calloc(r, sizeof(int));
if (!ptrs[0] || !ptrs[1] || !ptrs[2] || !ptrs[3]) {
int n;
for (n = 0; n < 4; n++)
if (ptrs[n])
free(ptrs[n]);
return NULL;
}
win = ptrs[0];
win->buf = ptrs[1];
win->firstx = ptrs[2];
win->lastx = ptrs[3];
for (row = 0; row < r; row++) {
win->buf[row] = calloc(c, sizeof(VIDCHR));
if (!win->buf[row])
break;
}
if (row < r) {
int n;
/* almost made it */
while (--row >= 0)
free(win->buf[row]);
for (n = 0; n < 4; n++)
free(ptrs[n]);
return NULL;
}
fillch.chr = ' ';
fillch.att = __DEFNORM;
for (row = 0; row < r; row++)
memsetw(win->buf[row], &fillch, c);
win->orgy = y;
win->orgx = x;
win->maxy = r - 1;
win->maxx = c - 1;
win->n_attr = win->attrib = __DEFNORM;
win->s_attr = __DEFSTAND;
win->b_attr = __DEFBRIGHT;
win->flags |= (_WWRAP | _WSCROLL);
if (r >= LINES && c >= COLS)
win->flags |= _WFULLWIN;
touchwin(win);
return win;
}
/*
r, c are scaled to fit if they are 0
y, x are relative to the screen, NOT the parent window
*/
WINDOW *
subwin(win, r, c, y, x)
WINDOW *win;
{
WINDOW *sub;
int yoffs, xoffs, row, col;
void *ptrs[4];
yoffs = y - win->orgy;
xoffs = x - win->orgx;
if (yoffs < 0 || xoffs < 0) /* out of bounds */
return 0;
row = win->maxy - yoffs + 1;
col = win->maxx - xoffs + 1;
if (row < 1 || col < 1) /* out of bounds */
return 0;
if (r == 0) /* set max rows */
r = row;
else if (r > row) /* too tall */
return 0;
if (c == 0) /* set max cols */
c = col;
else if (c > col) /* too wide */
return 0;
ptrs[0] = calloc(1, sizeof(WINDOW));
ptrs[1] = calloc(r, sizeof(VIDCHR *));
ptrs[2] = calloc(r, sizeof(int));
ptrs[3] = calloc(r, sizeof(int));
if (!ptrs[0] || !ptrs[1] || !ptrs[2] || !ptrs[3]) {
int n;
for (n = 0; n < 4; n++)
if (ptrs[n])
free(ptrs[n]);
return NULL;
}
sub = ptrs[0];
sub->buf = ptrs[1];
sub->firstx = ptrs[2];
sub->lastx = ptrs[3];
for (row = 0; row < r; row++)
sub->buf[row] = win->buf[row + yoffs] + xoffs;
sub->orgy = y;
sub->orgx = x;
sub->maxy = r - 1;
sub->maxx = c - 1;
sub->attrib = win->attrib;
sub->n_attr = win->n_attr;
sub->s_attr = win->s_attr;
sub->b_attr = win->b_attr;
sub->flags = win->flags | _WSUBWIN;
if (r < LINES || c < COLS)
sub->flags &= ~_WFULLWIN;
touchwin(sub);
return sub;
}