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Diffstat (limited to 'ncurses/tinfo/setbuf.c')
| -rw-r--r-- | ncurses/tinfo/setbuf.c | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/ncurses/tinfo/setbuf.c b/ncurses/tinfo/setbuf.c deleted file mode 100644 index a2e2660..0000000 --- a/ncurses/tinfo/setbuf.c +++ /dev/null @@ -1,169 +0,0 @@ -/**************************************************************************** - * Copyright (c) 1998-2009,2010 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> * - * and: Thomas E. Dickey 1996-on * - * and: Juergen Pfeifer 2008 * - ****************************************************************************/ - -/* -** setbuf.c -** -** Support for set_term(), reset_shell_mode(), reset_prog_mode(). -** -*/ - -#include <curses.priv.h> - -MODULE_ID("$Id: setbuf.c,v 1.16 2010/08/28 21:08:31 tom Exp $") - -/* - * If the output file descriptor is connected to a tty (the typical case) it - * will probably be line-buffered. Keith Bostic pointed out that we don't want - * this; it hoses people running over networks by forcing out a bunch of small - * packets instead of one big one, so screen updates on ptys look jerky. - * Restore block buffering to prevent this minor lossage. - * - * The buffer size is a compromise. Ideally we'd like a buffer that can hold - * the maximum possible update size (the whole screen plus cup commands to - * change lines as it's painted). On a 66-line xterm this can become - * excessive. So we min it with the amount of data we think we can get through - * two Ethernet packets (maximum packet size - 100 for TCP/IP overhead). - * - * Why two ethernet packets? It used to be one, on the theory that said - * packets define the maximum size of atomic update. But that's less than the - * 2000 chars on a 25 x 80 screen, and we don't want local updates to flicker - * either. Two packet lengths will handle up to a 35 x 80 screen. - * - * The magic '6' is the estimated length of the end-of-line cup sequence to go - * to the next line. It's generous. We used to mess with the buffering in - * init_mvcur() after cost computation, but that lost the sequences emitted by - * init_acs() in setupscreen(). - * - * "The setvbuf function may be used only after the stream pointed to by stream - * has been associated with an open file and before any other operation is - * performed on the stream." (ISO 7.9.5.6.) - * - * Grrrr... - * - * On a lighter note, many implementations do in fact allow an application to - * reset the buffering after it has been written to. We try to do this because - * otherwise we leave stdout in buffered mode after endwin() is called. (This - * also happens with SVr4 curses). - * - * There are pros/cons: - * - * con: - * There is no guarantee that we can reestablish buffering once we've - * dropped it. - * - * We _may_ lose data if the implementation does not coordinate this with - * fflush. - * - * pro: - * An implementation is more likely to refuse to change the buffering than - * to do it in one of the ways mentioned above. - * - * The alternative is to have the application try to change buffering - * itself, which is certainly no improvement. - * - * Just in case it does not work well on a particular system, the calls to - * change buffering are all via the macro NC_BUFFERED. Some implementations - * do indeed get confused by changing setbuf on/off, and will overrun the - * buffer. So we disable this by default (there may yet be a workaround). - */ -NCURSES_EXPORT(void) -NCURSES_SP_NAME(_nc_set_buffer) (NCURSES_SP_DCLx FILE *ofp, bool buffered) -{ - int Cols; - int Lines; - - if (0 == SP_PARM) - return; - - Cols = *(ptrCols(SP_PARM)); - Lines = *(ptrLines(SP_PARM)); - - /* optional optimization hack -- do before any output to ofp */ -#if HAVE_SETVBUF || HAVE_SETBUFFER - if (SP_PARM->_buffered != buffered) { - unsigned buf_len; - char *buf_ptr; - - if (getenv("NCURSES_NO_SETBUF") != 0) - return; - - fflush(ofp); -#ifdef __DJGPP__ - setmode(ofp, O_BINARY); -#endif - if (buffered != 0) { - buf_len = (unsigned) min(Lines * (Cols + 6), 2800); - if ((buf_ptr = SP_PARM->_setbuf) == 0) { - if ((buf_ptr = typeMalloc(char, buf_len)) == NULL) - return; - SP_PARM->_setbuf = buf_ptr; - /* Don't try to free this! */ - } -#if !USE_SETBUF_0 - else - return; -#endif - } else { -#if !USE_SETBUF_0 - return; -#else - buf_len = 0; - buf_ptr = 0; -#endif - } - -#if HAVE_SETVBUF -#ifdef SETVBUF_REVERSED /* pre-svr3? */ - (void) setvbuf(ofp, buf_ptr, buf_len, buf_len ? _IOFBF : _IOLBF); -#else - (void) setvbuf(ofp, buf_ptr, buf_len ? _IOFBF : _IOLBF, buf_len); -#endif -#elif HAVE_SETBUFFER - (void) setbuffer(ofp, buf_ptr, (int) buf_len); -#endif - - SP_PARM->_buffered = buffered; - } -#endif /* HAVE_SETVBUF || HAVE_SETBUFFER */ -} - -#if NCURSES_SP_FUNCS -NCURSES_EXPORT(void) -_nc_set_buffer(FILE *ofp, bool buffered) -{ - NCURSES_SP_NAME(_nc_set_buffer) (CURRENT_SCREEN, ofp, buffered); -} -#endif |