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/* This work is copyrighted. See COPYRIGHT.OLD & COPYRIGHT.NEW for *
* details. If they are missing then this copy is in violation of *
* the copyright conditions. */
/*
** lib_addch.c
**
** The routine waddch().
**
*/
#include "curses.priv.h"
#include "unctrl.h"
static inline chtype render_char(WINDOW *win, chtype ch)
/* compute a rendition of the given char correct for the current context */
{
if (TextOf(ch) == ' ')
ch = ch_or_attr(ch, win->_bkgd);
else if (!(ch & A_ATTRIBUTES))
ch = ch_or_attr(ch, (win->_bkgd & A_ATTRIBUTES));
TR(TRACE_CHARPUT, ("bkg = %#lx -> ch = %#lx", win->_bkgd, ch));
return(ch);
}
chtype _nc_background(WINDOW *win)
/* make render_char() visible while still allowing us to inline it below */
{
return(render_char(win, BLANK));
}
chtype _nc_render(WINDOW *win, chtype ch)
/* make render_char() visible while still allowing us to inline it below */
{
chtype c = render_char(win,ch);
return (ch_or_attr(c,win->_attrs));
}
static int
wladdch(WINDOW *win, chtype c, bool literal)
{
int x, y;
int newx;
chtype ch = c;
x = win->_curx;
y = win->_cury;
if (y > win->_maxy || x > win->_maxx || y < 0 || x < 0)
return(ERR);
/* ugly, but necessary --- and, bizarrely enough, even portable! */
if (literal)
goto noctrl;
switch (ch&A_CHARTEXT) {
case '\t':
for (newx = x + (8 - (x & 07)); x < newx; x++)
if (waddch(win, ' ') == ERR)
return(ERR);
return(OK);
case '\n':
wclrtoeol(win);
x = 0;
goto newline;
case '\r':
x = 0;
break;
case '\b':
if (--x < 0)
x = 0;
break;
default:
if (ch < ' ')
return(waddstr(win, unctrl(ch)));
/* FALL THROUGH */
noctrl:
T(("win attr = %x", win->_attrs));
ch = render_char(win, ch);
ch = ch_or_attr(ch,win->_attrs);
if (win->_line[y][x] != ch) {
if (win->_firstchar[y] == _NOCHANGE)
win->_firstchar[y] = win->_lastchar[y] = x;
else if (x < win->_firstchar[y])
win->_firstchar[y] = x;
else if (x > win->_lastchar[y])
win->_lastchar[y] = x;
}
T(("char %d of line %d is %x", x, y, ch));
win->_line[y][x++] = ch;
if (x > win->_maxx) {
x = 0;
newline:
y++;
if (y > win->_regbottom) {
y--;
if (win->_scroll)
scroll(win);
}
}
break;
}
win->_curx = x;
win->_cury = y;
return(OK);
}
int waddch(WINDOW *win, chtype ch)
{
TR(TRACE_CHARPUT, ("waddch(%x,%c (%x)) called", win, ch&A_CHARTEXT, ch));
return wladdch(win, ch, FALSE);
}
int wechochar(WINDOW *win, chtype ch)
{
T(("wechochar(%x,%c (%x)) called", win, ch&A_CHARTEXT, ch));
return wladdch(win, ch, TRUE);
}
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