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Diffstat (limited to 'lib/libcurses/base/lib_addch.c')
| -rw-r--r-- | lib/libcurses/base/lib_addch.c | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/lib/libcurses/base/lib_addch.c b/lib/libcurses/base/lib_addch.c new file mode 100644 index 00000000000..cc22401c8ee --- /dev/null +++ b/lib/libcurses/base/lib_addch.c @@ -0,0 +1,295 @@ +/* $OpenBSD: lib_addch.c,v 1.1 1999/01/18 19:09:34 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 <zmbenhal@netcom.com> 1992,1995 * + * and: Eric S. Raymond <esr@snark.thyrsus.com> * + ****************************************************************************/ + +/* +** lib_addch.c +** +** The routine waddch(). +** +*/ + +#include <curses.priv.h> +#include <ctype.h> + +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); +} |