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