1 /****************************************************************************
2  * Copyright (c) 1998-2009,2010 Free Software Foundation, Inc.              *
3  *                                                                          *
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11  *                                                                          *
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14  *                                                                          *
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22  *                                                                          *
23  * Except as contained in this notice, the name(s) of the above copyright   *
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28 
29 /****************************************************************************
30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
32  *     and: Thomas E. Dickey                        2002                    *
33  *     and: Juergen Pfeifer                         2009                    *
34  ****************************************************************************/
35 
36 /*
37  *	lib_kernel.c
38  *
39  *	Misc. low-level routines:
40  *		erasechar()
41  *		killchar()
42  *		flushinp()
43  *
44  * The baudrate() and delay_output() functions could logically live here,
45  * but are in other modules to reduce the static-link size of programs
46  * that use only these facilities.
47  */
48 
49 #include <curses.priv.h>
50 
51 MODULE_ID("$Id: lib_kernel.c,v 1.31 2010/12/19 01:21:19 tom Exp $")
52 
53 static int
54 _nc_vdisable(void)
55 {
56     int value = -1;
57 #if defined(_POSIX_VDISABLE) && HAVE_UNISTD_H
58     value = _POSIX_VDISABLE;
59 #endif
60 #if defined(_PC_VDISABLE)
61     if (value == -1) {
62 	value = (int) fpathconf(0, _PC_VDISABLE);
63 	if (value == -1) {
64 	    value = 0377;
65 	}
66     }
67 #elif defined(VDISABLE)
68     if (value == -1)
69 	value = VDISABLE;
70 #endif
71     return value;
72 }
73 
74 /*
75  *	erasechar()
76  *
77  *	Return erase character as given in cur_term->Ottyb.
78  *
79  */
80 
81 NCURSES_EXPORT(char)
82 NCURSES_SP_NAME(erasechar) (NCURSES_SP_DCL0)
83 {
84     int result = ERR;
85     TERMINAL *termp = TerminalOf(SP_PARM);
86 
87     T((T_CALLED("erasechar(%p)"), (void *) SP_PARM));
88 
89     if (termp != 0) {
90 #ifdef TERMIOS
91 	result = termp->Ottyb.c_cc[VERASE];
92 	if (result == _nc_vdisable())
93 	    result = ERR;
94 #else
95 	result = termp->Ottyb.sg_erase;
96 #endif
97     }
98     returnChar((char) result);
99 }
100 
101 #if NCURSES_SP_FUNCS
102 NCURSES_EXPORT(char)
103 erasechar(void)
104 {
105     return NCURSES_SP_NAME(erasechar) (CURRENT_SCREEN);
106 }
107 #endif
108 
109 /*
110  *	killchar()
111  *
112  *	Return kill character as given in cur_term->Ottyb.
113  *
114  */
115 
116 NCURSES_EXPORT(char)
117 NCURSES_SP_NAME(killchar) (NCURSES_SP_DCL0)
118 {
119     int result = ERR;
120     TERMINAL *termp = TerminalOf(SP_PARM);
121 
122     T((T_CALLED("killchar(%p)"), (void *) SP_PARM));
123 
124     if (termp != 0) {
125 #ifdef TERMIOS
126 	result = termp->Ottyb.c_cc[VKILL];
127 	if (result == _nc_vdisable())
128 	    result = ERR;
129 #else
130 	result = termp->Ottyb.sg_kill;
131 #endif
132     }
133     returnChar((char) result);
134 }
135 
136 #if NCURSES_SP_FUNCS
137 NCURSES_EXPORT(char)
138 killchar(void)
139 {
140     return NCURSES_SP_NAME(killchar) (CURRENT_SCREEN);
141 }
142 #endif
143 
144 /*
145  *	flushinp()
146  *
147  *	Flush any input on cur_term->Filedes
148  *
149  */
150 
151 NCURSES_EXPORT(int)
152 NCURSES_SP_NAME(flushinp) (NCURSES_SP_DCL0)
153 {
154     TERMINAL *termp = TerminalOf(SP_PARM);
155 
156     T((T_CALLED("flushinp(%p)"), (void *) SP_PARM));
157 
158     if (termp != 0) {
159 #ifdef TERMIOS
160 	tcflush(termp->Filedes, TCIFLUSH);
161 #else
162 	errno = 0;
163 	do {
164 	    ioctl(termp->Filedes, TIOCFLUSH, 0);
165 	} while
166 	    (errno == EINTR);
167 #endif
168 	if (SP_PARM) {
169 	    SP_PARM->_fifohead = -1;
170 	    SP_PARM->_fifotail = 0;
171 	    SP_PARM->_fifopeek = 0;
172 	}
173 	returnCode(OK);
174     }
175     returnCode(ERR);
176 }
177 
178 #if NCURSES_SP_FUNCS
179 NCURSES_EXPORT(int)
180 flushinp(void)
181 {
182     return NCURSES_SP_NAME(flushinp) (CURRENT_SCREEN);
183 }
184 #endif
185