1 /**************************************************************************** 2 * Copyright 2020 Thomas E. Dickey * 3 * Copyright 1998-2009,2010 Free Software Foundation, Inc. * 4 * * 5 * Permission is hereby granted, free of charge, to any person obtaining a * 6 * copy of this software and associated documentation files (the * 7 * "Software"), to deal in the Software without restriction, including * 8 * without limitation the rights to use, copy, modify, merge, publish, * 9 * distribute, distribute with modifications, sublicense, and/or sell * 10 * copies of the Software, and to permit persons to whom the Software is * 11 * furnished to do so, subject to the following conditions: * 12 * * 13 * The above copyright notice and this permission notice shall be included * 14 * in all copies or substantial portions of the Software. * 15 * * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 23 * * 24 * Except as contained in this notice, the name(s) of the above copyright * 25 * holders shall not be used in advertising or otherwise to promote the * 26 * sale, use or other dealings in this Software without prior written * 27 * authorization. * 28 ****************************************************************************/ 29 30 /**************************************************************************** 31 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 32 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 33 * and: Thomas E. Dickey 2002 * 34 * and: Juergen Pfeifer 2009 * 35 ****************************************************************************/ 36 37 /* 38 * lib_kernel.c 39 * 40 * Misc. low-level routines: 41 * erasechar() 42 * killchar() 43 * flushinp() 44 * 45 * The baudrate() and delay_output() functions could logically live here, 46 * but are in other modules to reduce the static-link size of programs 47 * that use only these facilities. 48 */ 49 50 #include <curses.priv.h> 51 52 MODULE_ID("$Id: lib_kernel.c,v 1.32 2020/02/02 23:34:34 tom Exp $") 53 54 static int 55 _nc_vdisable(void) 56 { 57 int value = -1; 58 #if defined(_POSIX_VDISABLE) && HAVE_UNISTD_H 59 value = _POSIX_VDISABLE; 60 #endif 61 #if defined(_PC_VDISABLE) 62 if (value == -1) { 63 value = (int) fpathconf(0, _PC_VDISABLE); 64 if (value == -1) { 65 value = 0377; 66 } 67 } 68 #elif defined(VDISABLE) 69 if (value == -1) 70 value = VDISABLE; 71 #endif 72 return value; 73 } 74 75 /* 76 * erasechar() 77 * 78 * Return erase character as given in cur_term->Ottyb. 79 * 80 */ 81 82 NCURSES_EXPORT(char) 83 NCURSES_SP_NAME(erasechar) (NCURSES_SP_DCL0) 84 { 85 int result = ERR; 86 TERMINAL *termp = TerminalOf(SP_PARM); 87 88 T((T_CALLED("erasechar(%p)"), (void *) SP_PARM)); 89 90 if (termp != 0) { 91 #ifdef TERMIOS 92 result = termp->Ottyb.c_cc[VERASE]; 93 if (result == _nc_vdisable()) 94 result = ERR; 95 #else 96 result = termp->Ottyb.sg_erase; 97 #endif 98 } 99 returnChar((char) result); 100 } 101 102 #if NCURSES_SP_FUNCS 103 NCURSES_EXPORT(char) 104 erasechar(void) 105 { 106 return NCURSES_SP_NAME(erasechar) (CURRENT_SCREEN); 107 } 108 #endif 109 110 /* 111 * killchar() 112 * 113 * Return kill character as given in cur_term->Ottyb. 114 * 115 */ 116 117 NCURSES_EXPORT(char) 118 NCURSES_SP_NAME(killchar) (NCURSES_SP_DCL0) 119 { 120 int result = ERR; 121 TERMINAL *termp = TerminalOf(SP_PARM); 122 123 T((T_CALLED("killchar(%p)"), (void *) SP_PARM)); 124 125 if (termp != 0) { 126 #ifdef TERMIOS 127 result = termp->Ottyb.c_cc[VKILL]; 128 if (result == _nc_vdisable()) 129 result = ERR; 130 #else 131 result = termp->Ottyb.sg_kill; 132 #endif 133 } 134 returnChar((char) result); 135 } 136 137 #if NCURSES_SP_FUNCS 138 NCURSES_EXPORT(char) 139 killchar(void) 140 { 141 return NCURSES_SP_NAME(killchar) (CURRENT_SCREEN); 142 } 143 #endif 144 145 /* 146 * flushinp() 147 * 148 * Flush any input on cur_term->Filedes 149 * 150 */ 151 152 NCURSES_EXPORT(int) 153 NCURSES_SP_NAME(flushinp) (NCURSES_SP_DCL0) 154 { 155 TERMINAL *termp = TerminalOf(SP_PARM); 156 157 T((T_CALLED("flushinp(%p)"), (void *) SP_PARM)); 158 159 if (termp != 0) { 160 #ifdef TERMIOS 161 tcflush(termp->Filedes, TCIFLUSH); 162 #else 163 errno = 0; 164 do { 165 ioctl(termp->Filedes, TIOCFLUSH, 0); 166 } while 167 (errno == EINTR); 168 #endif 169 if (SP_PARM) { 170 SP_PARM->_fifohead = -1; 171 SP_PARM->_fifotail = 0; 172 SP_PARM->_fifopeek = 0; 173 } 174 returnCode(OK); 175 } 176 returnCode(ERR); 177 } 178 179 #if NCURSES_SP_FUNCS 180 NCURSES_EXPORT(int) 181 flushinp(void) 182 { 183 return NCURSES_SP_NAME(flushinp) (CURRENT_SCREEN); 184 } 185 #endif 186