/* $OpenBSD: lib_addch.c,v 1.5 1998/07/23 21:18:25 millert Exp $ */ /**************************************************************************** * Copyright (c) 1998 Free Software Foundation, Inc. * * * * Permission is hereby granted, free of charge, to any person obtaining a * * copy of this software and associated documentation files (the * * "Software"), to deal in the Software without restriction, including * * without limitation the rights to use, copy, modify, merge, publish, * * distribute, distribute with modifications, sublicense, and/or sell * * copies of the Software, and to permit persons to whom the Software is * * furnished to do so, subject to the following conditions: * * * * The above copyright notice and this permission notice shall be included * * in all copies or substantial portions of the Software. * * * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * * * Except as contained in this notice, the name(s) of the above copyright * * holders shall not be used in advertising or otherwise to promote the * * sale, use or other dealings in this Software without prior written * * authorization. * ****************************************************************************/ /**************************************************************************** * Author: Zeyd M. Ben-Halim 1992,1995 * * and: Eric S. Raymond * ****************************************************************************/ /* ** lib_addch.c ** ** The routine waddch(). ** */ #include #include MODULE_ID("$From: lib_addch.c,v 1.41 1998/06/28 00:10:21 tom Exp $") /* * Ugly microtweaking alert. Everything from here to end of module is * likely to be speed-critical -- profiling data sure says it is! * Most of the important screen-painting functions are shells around * waddch(). So we make every effort to reduce function-call overhead * by inlining stuff, even at the cost of making wrapped copies for * export. Also we supply some internal versions that don't call the * window sync hook, for use by string-put functions. */ /* Return bit mask for clearing color pair number if given ch has color */ #define COLOR_MASK(ch) (~(chtype)((ch)&A_COLOR?A_COLOR:0)) static inline chtype render_char(WINDOW *win, chtype ch) /* compute a rendition of the given char correct for the current context */ { chtype a = win->_attrs; if (ch == ' ') { /* color in attrs has precedence over bkgd */ ch = a | (win->_bkgd & COLOR_MASK(a)); } else { /* color in attrs has precedence over bkgd */ a |= (win->_bkgd & A_ATTRIBUTES) & COLOR_MASK(a); /* color in ch has precedence */ ch |= (a & COLOR_MASK(ch)); } TR(TRACE_VIRTPUT, ("bkg = %lx, attrs = %lx -> ch = %lx", win->_bkgd, win->_attrs, ch)); return(ch); } chtype _nc_background(WINDOW *win) /* make render_char() visible while still allowing us to inline it below */ { return (win->_bkgd); } chtype _nc_render(WINDOW *win, chtype ch) /* make render_char() visible while still allowing us to inline it below */ { return render_char(win, ch); } /* check if position is legal; if not, return error */ #ifndef NDEBUG /* treat this like an assertion */ #define CHECK_POSITION(win, x, y) \ if (y > win->_maxy \ || x > win->_maxx \ || y < 0 \ || x < 0) { \ TR(TRACE_VIRTPUT, ("Alert! Win=%p _curx = %d, _cury = %d " \ "(_maxx = %d, _maxy = %d)", win, x, y, \ win->_maxx, win->_maxy)); \ return(ERR); \ } #else #define CHECK_POSITION(win, x, y) /* nothing */ #endif static inline int waddch_literal(WINDOW *win, chtype ch) { int x; struct ldat *line; x = win->_curx; CHECK_POSITION(win, x, win->_cury); /* * If we're trying to add a character at the lower-right corner more * than once, fail. (Moving the cursor will clear the flag). */ if (win->_flags & _WRAPPED) { if (x >= win->_maxx) return (ERR); win->_flags &= ~_WRAPPED; } ch = render_char(win, ch); TR(TRACE_VIRTPUT, ("win attr = %s", _traceattr(win->_attrs))); line = win->_line+win->_cury; CHANGED_CELL(line,x); line->text[x++] = ch; TR(TRACE_VIRTPUT, ("(%d, %d) = %s", win->_cury, x, _tracechtype(ch))); if (x > win->_maxx) { /* * The _WRAPPED flag is useful only for telling an application * that we've just wrapped the cursor. We don't do anything * with this flag except set it when wrapping, and clear it * whenever we move the cursor. If we try to wrap at the * lower-right corner of a window, we cannot move the cursor * (since that wouldn't be legal). So we return an error * (which is what SVr4 does). Unlike SVr4, we can successfully * add a character to the lower-right corner. */ win->_flags |= _WRAPPED; if (++win->_cury > win->_regbottom) { win->_cury = win->_regbottom; win->_curx = win->_maxx; if (!win->_scroll) return (ERR); scroll(win); } win->_curx = 0; return (OK); } win->_curx = x; return OK; } static inline int waddch_nosync(WINDOW *win, const chtype ch) /* the workhorse function -- add a character to the given window */ { int x, y; int t; const char *s; if ((ch & A_ALTCHARSET) || ((t = TextOf(ch)) > 127) || ((s = unctrl(t))[1] == 0)) return waddch_literal(win, ch); x = win->_curx; y = win->_cury; switch (t) { case '\t': x += (TABSIZE-(x%TABSIZE)); /* * Space-fill the tab on the bottom line so that we'll get the * "correct" cursor position. */ if ((! win->_scroll && (y == win->_regbottom)) || (x <= win->_maxx)) { chtype blank = (' ' | AttrOf(ch)); while (win->_curx < x) { if (waddch_literal(win, blank) == ERR) return(ERR); } break; } else { wclrtoeol(win); win->_flags |= _WRAPPED; if (++y > win->_regbottom) { x = win->_maxx; y--; if (win->_scroll) { scroll(win); x = 0; } } else { x = 0; } } break; case '\n': wclrtoeol(win); if (++y > win->_regbottom) { y--; if (win->_scroll) scroll(win); else return (ERR); } /* FALLTHRU */ case '\r': x = 0; win->_flags &= ~_WRAPPED; break; case '\b': if (x == 0) return (OK); x--; win->_flags &= ~_WRAPPED; break; default: while (*s) if (waddch_literal(win, (*s++)|AttrOf(ch)) == ERR) return ERR; return(OK); } win->_curx = x; win->_cury = y; return(OK); } int _nc_waddch_nosync(WINDOW *win, const chtype c) /* export copy of waddch_nosync() so the string-put functions can use it */ { return(waddch_nosync(win, c)); } /* * The versions below call _nc_synhook(). We wanted to avoid this in the * version exported for string puts; they'll call _nc_synchook once at end * of run. */ /* These are actual entry points */ int waddch(WINDOW *win, const chtype ch) { int code = ERR; TR(TRACE_VIRTPUT|TRACE_CCALLS, (T_CALLED("waddch(%p, %s)"), win, _tracechtype(ch))); if (win && (waddch_nosync(win, ch) != ERR)) { _nc_synchook(win); code = OK; } TR(TRACE_VIRTPUT|TRACE_CCALLS, (T_RETURN("%d"), code)); return(code); } int wechochar(WINDOW *win, const chtype ch) { int code = ERR; TR(TRACE_VIRTPUT|TRACE_CCALLS, (T_CALLED("wechochar(%p, %s)"), win, _tracechtype(ch))); if (win && (waddch_nosync(win, ch) != ERR)) { bool save_immed = win->_immed; win->_immed = TRUE; _nc_synchook(win); win->_immed = save_immed; code = OK; } TR(TRACE_VIRTPUT|TRACE_CCALLS, (T_RETURN("%d"), code)); return(code); }