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+
+/***************************************************************************
+* COPYRIGHT NOTICE *
+****************************************************************************
+* ncurses is copyright (C) 1992-1995 *
+* Zeyd M. Ben-Halim *
+* zmbenhal@netcom.com *
+* Eric S. Raymond *
+* esr@snark.thyrsus.com *
+* *
+* Permission is hereby granted to reproduce and distribute ncurses *
+* by any means and for any fee, whether alone or as part of a *
+* larger distribution, in source or in binary form, PROVIDED *
+* this notice is included with any such distribution, and is not *
+* removed from any of its header files. Mention of ncurses in any *
+* applications linked with it is highly appreciated. *
+* *
+* ncurses comes AS IS with no warranty, implied or expressed. *
+* *
+***************************************************************************/
+
+
+/*
+ * raw.c
+ *
+ * Routines:
+ * raw()
+ * echo()
+ * nl()
+ * cbreak()
+ * noraw()
+ * noecho()
+ * nonl()
+ * nocbreak()
+ * qiflush()
+ * noqiflush()
+ * intrflush()
+ *
+ */
+
+#include "curses.priv.h"
+#include "term.h" /* cur_term */
+
+/*
+ * COOKED_INPUT defines the collection of input mode bits to be
+ * cleared when entering raw mode, then re-set by noraw().
+ *
+ * We used to clear ISTRIP and INPCK when going to raw mode. Keith
+ * Bostic says that's wrong, because those are hardware bits that the
+ * user has to get right in his/her initial environment -- he says
+ * curses can't do any good by clearing these, and may do harm. In
+ * 1995's world of 8N1 connections over error-correcting modems, all
+ * the parity-check stuff is pretty nearly irrelevant anyway.
+ *
+ * What's supposed to happen when noraw() executes has never been very
+ * well-defined. Yes, it should reset ISIG/ICANON/OPOST (historical
+ * practice is for it to attempt to take the driver back to cooked
+ * mode, rather going to some half-baked cbreak-like intermediate
+ * level).
+ *
+ * We make a design choice here to turn off CR/LF translation a la BSD
+ * when raw() is enabled, on the theory that a programmer requesting
+ * raw() ideally wants an 8-bit data stream that's been messed with as
+ * little as possible. The man pages document this.
+ *
+ * We originally opted for the simplest way to handle noraw(); just set all
+ * the flags we cleared. Unfortunately, having noraw() set IGNCR
+ * turned out to be too painful. So raw() now clears the COOKED_INPUT
+ * flags, but also clears (ICRNL|INLCR|IGNCR) which noraw() doesn't
+ * restore.
+ *
+ * Unfortunately, this means noraw() may still force some COOKED_INPUT
+ * flags on that the user had initially cleared via stty. It'll all
+ * come out in the wash when endwin() restores the user's original
+ * input bits (we hope...)
+ *
+ */
+#define COOKED_INPUT (IXON|IGNBRK|BRKINT|PARMRK)
+
+int raw(void)
+{
+ T(("raw() called"));
+
+ SP->_raw = TRUE;
+ SP->_cbreak = TRUE;
+
+#ifdef TERMIOS
+ cur_term->Nttyb.c_lflag &= ~(ICANON|ISIG|IEXTEN);
+ cur_term->Nttyb.c_iflag &= ~(COOKED_INPUT|ICRNL|INLCR|IGNCR);
+ cur_term->Nttyb.c_oflag &= ~(OPOST);
+ cur_term->Nttyb.c_cc[VMIN] = 1;
+ cur_term->Nttyb.c_cc[VTIME] = 0;
+ if((tcsetattr(cur_term->Filedes, TCSANOW, &cur_term->Nttyb)) == -1)
+ return ERR;
+ else
+ return OK;
+#else
+ cur_term->Nttyb.sg_flags |= RAW;
+ stty(cur_term->Filedes, &cur_term->Nttyb);
+ return OK;
+#endif
+}
+
+int cbreak(void)
+{
+ T(("cbreak() called"));
+
+ SP->_cbreak = TRUE;
+
+#ifdef TERMIOS
+ cur_term->Nttyb.c_lflag &= ~ICANON;
+ cur_term->Nttyb.c_lflag |= ISIG;
+ cur_term->Nttyb.c_cc[VMIN] = 1;
+ cur_term->Nttyb.c_cc[VTIME] = 0;
+ if((tcsetattr(cur_term->Filedes, TCSANOW, &cur_term->Nttyb)) == -1)
+ return ERR;
+ else
+ return OK;
+#else
+ cur_term->Nttyb.sg_flags |= CBREAK;
+ stty(cur_term->Filedes, &cur_term->Nttyb);
+ return OK;
+#endif
+}
+
+int echo(void)
+{
+ T(("echo() called"));
+
+ SP->_echo = TRUE;
+
+#ifdef TERMIOS
+ cur_term->Nttyb.c_lflag |= ECHO;
+ if((tcsetattr(cur_term->Filedes, TCSANOW, &cur_term->Nttyb)) == -1)
+ return ERR;
+ else
+ return OK;
+#else
+ cur_term->Nttyb.sg_flags |= ECHO;
+ stty(cur_term->Filedes, &cur_term->Nttyb);
+ return OK;
+#endif
+}
+
+
+int nl(void)
+{
+ T(("nl() called"));
+
+ SP->_nl = TRUE;
+
+#ifdef TERMIOS
+ /* the code used to set IXON|IXOFF here, Ghod knows why... */
+ cur_term->Nttyb.c_iflag |= ICRNL;
+ cur_term->Nttyb.c_oflag |= OPOST|ONLCR;
+ if((tcsetattr(cur_term->Filedes, TCSANOW, &cur_term->Nttyb)) == -1)
+ return ERR;
+ else
+ return OK;
+#else
+ cur_term->Nttyb.sg_flags |= CRMOD;
+ stty(cur_term->Filedes, &cur_term->Nttyb);
+ return OK;
+#endif
+}
+
+
+int qiflush(void)
+{
+ T(("qiflush() called"));
+
+ /*
+ * Note: this implementation may be wrong. See the comment under
+ * intrflush().
+ */
+
+#ifdef TERMIOS
+ cur_term->Nttyb.c_lflag &= ~(NOFLSH);
+ if((tcsetattr(cur_term->Filedes, TCSANOW, &cur_term->Nttyb)) == -1)
+ return ERR;
+ else
+ return OK;
+#else
+ return ERR;
+#endif
+}
+
+
+int noraw(void)
+{
+ T(("noraw() called"));
+
+ SP->_raw = FALSE;
+ SP->_cbreak = FALSE;
+
+#ifdef TERMIOS
+ cur_term->Nttyb.c_lflag |= ISIG|ICANON|IEXTEN;
+ cur_term->Nttyb.c_iflag |= COOKED_INPUT;
+ cur_term->Nttyb.c_oflag |= OPOST;
+ if((tcsetattr(cur_term->Filedes, TCSANOW, &cur_term->Nttyb)) == -1)
+ return ERR;
+ else
+ return OK;
+#else
+ cur_term->Nttyb.sg_flags &= ~(RAW|CBREAK);
+ stty(cur_term->Filedes, &cur_term->Nttyb);
+ return OK;
+#endif
+
+}
+
+
+int nocbreak(void)
+{
+ T(("nocbreak() called"));
+
+ SP->_cbreak = 0;
+
+#ifdef TERMIOS
+ cur_term->Nttyb.c_lflag |= ICANON;
+ if((tcsetattr(cur_term->Filedes, TCSANOW, &cur_term->Nttyb)) == -1)
+ return ERR;
+ else
+ return OK;
+#else
+ cur_term->Nttyb.sg_flags &= ~CBREAK;
+ stty(cur_term->Filedes, &cur_term->Nttyb);
+ return OK;
+#endif
+}
+
+int noecho(void)
+{
+ T(("noecho() called"));
+
+ SP->_echo = FALSE;
+
+#ifdef TERMIOS
+ /*
+ * Turn off ECHONL to avoid having \n still be echoed when
+ * cooked mode is in effect (that is, ICANON is on).
+ */
+ cur_term->Nttyb.c_lflag &= ~(ECHO|ECHONL);
+ if((tcsetattr(cur_term->Filedes, TCSANOW, &cur_term->Nttyb)) == -1)
+ return ERR;
+ else
+ return OK;
+#else
+ cur_term->Nttyb.sg_flags &= ~ECHO;
+ stty(cur_term->Filedes, &cur_term->Nttyb);
+ return OK;
+#endif
+}
+
+
+int nonl(void)
+{
+ T(("nonl() called"));
+
+ SP->_nl = FALSE;
+
+#ifdef TERMIOS
+ cur_term->Nttyb.c_iflag &= ~ICRNL;
+ cur_term->Nttyb.c_oflag &= ~ONLCR;
+ if((tcsetattr(cur_term->Filedes, TCSANOW, &cur_term->Nttyb)) == -1)
+ return ERR;
+ else
+ return OK;
+#else
+ cur_term->Nttyb.sg_flags &= ~CRMOD;
+ stty(cur_term->Filedes, &cur_term->Nttyb);
+ return OK;
+#endif
+}
+
+int noqiflush(void)
+{
+ T(("noqiflush() called"));
+
+ /*
+ * Note: this implementation may be wrong. See the comment under
+ * intrflush().
+ */
+
+#ifdef TERMIOS
+ cur_term->Nttyb.c_lflag |= NOFLSH;
+ if((tcsetattr(cur_term->Filedes, TCSANOW, &cur_term->Nttyb)) == -1)
+ return ERR;
+ else
+ return OK;
+#else
+ return ERR;
+#endif
+}
+
+int intrflush(WINDOW *win, bool flag)
+{
+ T(("intrflush() called"));
+
+ /*
+ * This call does the same thing as the qiflush()/noqiflush()
+ * pair. We know for certain that SVr3 intrflush() tweaks the
+ * NOFLSH bit; on the other hand, the match (in the SVr4 man
+ * pages) between the language describing NOFLSH in termio(7)
+ * and the language describing qiflush()/noqiflush() in
+ * curs_inopts(3x) is too exact to be coincidence.
+ */
+
+#ifdef TERMIOS
+ if (flag)
+ cur_term->Nttyb.c_lflag &= ~(NOFLSH);
+ else
+ cur_term->Nttyb.c_lflag |= (NOFLSH);
+ if((tcsetattr(cur_term->Filedes, TCSANOW, &cur_term->Nttyb)) == -1)
+ return ERR;
+ else
+ return OK;
+#else
+ return ERR;
+#endif
+}
+
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.