summaryrefslogtreecommitdiff
path: root/src/sys/con_tty.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/sys/con_tty.c')
-rw-r--r--src/sys/con_tty.c440
1 files changed, 440 insertions, 0 deletions
diff --git a/src/sys/con_tty.c b/src/sys/con_tty.c
new file mode 100644
index 00000000..dd37c19c
--- /dev/null
+++ b/src/sys/con_tty.c
@@ -0,0 +1,440 @@
+/*
+===========================================================================
+Copyright (C) 1999-2005 Id Software, Inc.
+
+This file is part of Quake III Arena source code.
+
+Quake III Arena source code is free software; you can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation; either version 2 of the License,
+or (at your option) any later version.
+
+Quake III Arena source code is distributed in the hope that it will be
+useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Quake III Arena source code; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+===========================================================================
+*/
+
+#include "../qcommon/q_shared.h"
+#include "../qcommon/qcommon.h"
+
+#include <unistd.h>
+#include <signal.h>
+#include <termios.h>
+#include <fcntl.h>
+
+/*
+=============================================================
+tty console routines
+
+NOTE: if the user is editing a line when something gets printed to the early
+console then it won't look good so we provide CON_Hide and CON_Show to be
+called before and after a stdout or stderr output
+=============================================================
+*/
+
+// general flag to tell about tty console mode
+static qboolean ttycon_on = qfalse;
+static int ttycon_hide = 0;
+
+// some key codes that the terminal may be using, initialised on start up
+static int TTY_erase;
+static int TTY_eof;
+
+static struct termios TTY_tc;
+
+static field_t TTY_con;
+
+// This is somewhat of aduplicate of the graphical console history
+// but it's safer more modular to have our own here
+#define CON_HISTORY 32
+static field_t ttyEditLines[ CON_HISTORY ];
+static int hist_current = -1, hist_count = 0;
+
+/*
+==================
+CON_FlushIn
+
+Flush stdin, I suspect some terminals are sending a LOT of shit
+FIXME relevant?
+==================
+*/
+static void CON_FlushIn( void )
+{
+ char key;
+ while (read(0, &key, 1)!=-1);
+}
+
+/*
+==================
+CON_Back
+
+Output a backspace
+
+NOTE: it seems on some terminals just sending '\b' is not enough so instead we
+send "\b \b"
+(FIXME there may be a way to find out if '\b' alone would work though)
+==================
+*/
+static void CON_Back( void )
+{
+ char key;
+ key = '\b';
+ write(1, &key, 1);
+ key = ' ';
+ write(1, &key, 1);
+ key = '\b';
+ write(1, &key, 1);
+}
+
+/*
+==================
+CON_Hide
+
+Clear the display of the line currently edited
+bring cursor back to beginning of line
+==================
+*/
+void CON_Hide( void )
+{
+ if( ttycon_on )
+ {
+ int i;
+ if (ttycon_hide)
+ {
+ ttycon_hide++;
+ return;
+ }
+ if (TTY_con.cursor>0)
+ {
+ for (i=0; i<TTY_con.cursor; i++)
+ {
+ CON_Back();
+ }
+ }
+ CON_Back(); // Delete "]"
+ ttycon_hide++;
+ }
+}
+
+/*
+==================
+CON_Show
+
+Show the current line
+FIXME need to position the cursor if needed?
+==================
+*/
+void CON_Show( void )
+{
+ if( ttycon_on )
+ {
+ int i;
+
+ assert(ttycon_hide>0);
+ ttycon_hide--;
+ if (ttycon_hide == 0)
+ {
+ write( 1, "]", 1 );
+ if (TTY_con.cursor)
+ {
+ for (i=0; i<TTY_con.cursor; i++)
+ {
+ write(1, TTY_con.buffer+i, 1);
+ }
+ }
+ }
+ }
+}
+
+/*
+==================
+CON_Shutdown
+
+Never exit without calling this, or your terminal will be left in a pretty bad state
+==================
+*/
+void CON_Shutdown( void )
+{
+ if (ttycon_on)
+ {
+ CON_Back(); // Delete "]"
+ tcsetattr (0, TCSADRAIN, &TTY_tc);
+ }
+
+ // Restore blocking to stdin reads
+ fcntl( 0, F_SETFL, fcntl( 0, F_GETFL, 0 ) & ~O_NDELAY );
+}
+
+/*
+==================
+Hist_Add
+==================
+*/
+void Hist_Add(field_t *field)
+{
+ int i;
+ assert(hist_count <= CON_HISTORY);
+ assert(hist_count >= 0);
+ assert(hist_current >= -1);
+ assert(hist_current <= hist_count);
+ // make some room
+ for (i=CON_HISTORY-1; i>0; i--)
+ {
+ ttyEditLines[i] = ttyEditLines[i-1];
+ }
+ ttyEditLines[0] = *field;
+ if (hist_count<CON_HISTORY)
+ {
+ hist_count++;
+ }
+ hist_current = -1; // re-init
+}
+
+/*
+==================
+Hist_Prev
+==================
+*/
+field_t *Hist_Prev( void )
+{
+ int hist_prev;
+ assert(hist_count <= CON_HISTORY);
+ assert(hist_count >= 0);
+ assert(hist_current >= -1);
+ assert(hist_current <= hist_count);
+ hist_prev = hist_current + 1;
+ if (hist_prev >= hist_count)
+ {
+ return NULL;
+ }
+ hist_current++;
+ return &(ttyEditLines[hist_current]);
+}
+
+/*
+==================
+Hist_Next
+==================
+*/
+field_t *Hist_Next( void )
+{
+ assert(hist_count <= CON_HISTORY);
+ assert(hist_count >= 0);
+ assert(hist_current >= -1);
+ assert(hist_current <= hist_count);
+ if (hist_current >= 0)
+ {
+ hist_current--;
+ }
+ if (hist_current == -1)
+ {
+ return NULL;
+ }
+ return &(ttyEditLines[hist_current]);
+}
+
+/*
+==================
+CON_Init
+
+Initialize the console input (tty mode if possible)
+==================
+*/
+void CON_Init( void )
+{
+ struct termios tc;
+
+ // If the process is backgrounded (running non interactively)
+ // then SIGTTIN or SIGTOU is emitted, if not caught, turns into a SIGSTP
+ signal(SIGTTIN, SIG_IGN);
+ signal(SIGTTOU, SIG_IGN);
+
+ // Make stdin reads non-blocking
+ fcntl( 0, F_SETFL, fcntl( 0, F_GETFL, 0 ) | O_NDELAY );
+
+ if (isatty(STDIN_FILENO)!=1)
+ {
+ Com_Printf( "stdin is not a tty, tty console mode disabled\n");
+ ttycon_on = qfalse;
+ return;
+ }
+
+ Field_Clear(&TTY_con);
+ tcgetattr (0, &TTY_tc);
+ TTY_erase = TTY_tc.c_cc[VERASE];
+ TTY_eof = TTY_tc.c_cc[VEOF];
+ tc = TTY_tc;
+
+ /*
+ ECHO: don't echo input characters
+ ICANON: enable canonical mode. This enables the special
+ characters EOF, EOL, EOL2, ERASE, KILL, REPRINT,
+ STATUS, and WERASE, and buffers by lines.
+ ISIG: when any of the characters INTR, QUIT, SUSP, or
+ DSUSP are received, generate the corresponding sig­
+ nal
+ */
+ tc.c_lflag &= ~(ECHO | ICANON);
+
+ /*
+ ISTRIP strip off bit 8
+ INPCK enable input parity checking
+ */
+ tc.c_iflag &= ~(ISTRIP | INPCK);
+ tc.c_cc[VMIN] = 1;
+ tc.c_cc[VTIME] = 0;
+ tcsetattr (0, TCSADRAIN, &tc);
+ ttycon_on = qtrue;
+}
+
+/*
+==================
+CON_ConsoleInput
+==================
+*/
+char *CON_ConsoleInput( void )
+{
+ // we use this when sending back commands
+ static char text[256];
+ int avail;
+ char key;
+ field_t *history;
+
+ if( ttycon_on )
+ {
+ avail = read(0, &key, 1);
+ if (avail != -1)
+ {
+ // we have something
+ // backspace?
+ // NOTE TTimo testing a lot of values .. seems it's the only way to get it to work everywhere
+ if ((key == TTY_erase) || (key == 127) || (key == 8))
+ {
+ if (TTY_con.cursor > 0)
+ {
+ TTY_con.cursor--;
+ TTY_con.buffer[TTY_con.cursor] = '\0';
+ CON_Back();
+ }
+ return NULL;
+ }
+ // check if this is a control char
+ if ((key) && (key) < ' ')
+ {
+ if (key == '\n')
+ {
+ // push it in history
+ Hist_Add(&TTY_con);
+ strcpy(text, TTY_con.buffer);
+ Field_Clear(&TTY_con);
+ key = '\n';
+ write(1, &key, 1);
+ write( 1, "]", 1 );
+ return text;
+ }
+ if (key == '\t')
+ {
+ CON_Hide();
+ Field_AutoComplete( &TTY_con );
+ CON_Show();
+ return NULL;
+ }
+ avail = read(0, &key, 1);
+ if (avail != -1)
+ {
+ // VT 100 keys
+ if (key == '[' || key == 'O')
+ {
+ avail = read(0, &key, 1);
+ if (avail != -1)
+ {
+ switch (key)
+ {
+ case 'A':
+ history = Hist_Prev();
+ if (history)
+ {
+ CON_Hide();
+ TTY_con = *history;
+ CON_Show();
+ }
+ CON_FlushIn();
+ return NULL;
+ break;
+ case 'B':
+ history = Hist_Next();
+ CON_Hide();
+ if (history)
+ {
+ TTY_con = *history;
+ } else
+ {
+ Field_Clear(&TTY_con);
+ }
+ CON_Show();
+ CON_FlushIn();
+ return NULL;
+ break;
+ case 'C':
+ return NULL;
+ case 'D':
+ return NULL;
+ }
+ }
+ }
+ }
+ Com_DPrintf("droping ISCTL sequence: %d, TTY_erase: %d\n", key, TTY_erase);
+ CON_FlushIn();
+ return NULL;
+ }
+ // push regular character
+ TTY_con.buffer[TTY_con.cursor] = key;
+ TTY_con.cursor++;
+ // print the current line (this is differential)
+ write(1, &key, 1);
+ }
+
+ return NULL;
+ }
+ else
+ {
+ int len;
+ fd_set fdset;
+ struct timeval timeout;
+ static qboolean stdin_active;
+
+ if (!com_dedicated || !com_dedicated->value)
+ return NULL;
+
+ if (!stdin_active)
+ return NULL;
+
+ FD_ZERO(&fdset);
+ FD_SET(0, &fdset); // stdin
+ timeout.tv_sec = 0;
+ timeout.tv_usec = 0;
+ if (select (1, &fdset, NULL, NULL, &timeout) == -1 || !FD_ISSET(0, &fdset))
+ {
+ return NULL;
+ }
+
+ len = read (0, text, sizeof(text));
+ if (len == 0)
+ { // eof!
+ stdin_active = qfalse;
+ return NULL;
+ }
+
+ if (len < 1)
+ return NULL;
+ text[len-1] = 0; // rip off the /n and terminate
+
+ return text;
+ }
+}
generated by cgit (git 2.34.1) at 2024-12-24 18:11:05 +0000