add directory study

study/linux-travel/MINIX-1.5/1.5/Source/commands/ic/ic_input.c

@@ -0,0 +1,277 @@
+/****************************************************************/
+/*								*/
+/*	ic_input.c						*/
+/*								*/
+/*		Character input routines for the		*/
+/*		"Integer Calculator".				*/
+/*								*/
+/****************************************************************/
+/*  origination          1988-Apr-7         Terrence W. Holm	*/
+/*  added cmd line args  1988-May-13	    Terrence W. Holm	*/
+/****************************************************************/
+
+
+
+#include <stdio.h>
+#include <ctype.h>
+#include <sgtty.h>
+
+#include "ic.h"
+
+static struct sgttyb saved_mode;
+static struct tchars saved_chars;
+
+
+
+
+/****************************************************************/
+/*								*/
+/*	Save_Term()						*/
+/*								*/
+/*		Save the current terminal characteristics.	*/
+/*								*/
+/****************************************************************/
+
+
+Save_Term()
+
+  {
+  ioctl( 0, TIOCGETP, &saved_mode  );
+  ioctl( 0, TIOCGETC, (struct sgttyb *) &saved_chars );
+  }
+
+
+
+
+
+
+
+
+/****************************************************************/
+/*								*/
+/*	Set_Term()						*/
+/*								*/
+/*		Set up the terminal characteristics for ic.	*/
+/*								*/
+/****************************************************************/
+
+
+Set_Term()
+
+  {
+  struct sgttyb ic_mode;
+  struct tchars ic_chars;
+
+  ic_mode  = saved_mode;
+  ic_chars = saved_chars;
+
+
+  /*  No tab expansion, no echo, cbreak mode			*/
+
+  ic_mode.sg_flags = ic_mode.sg_flags & ~XTABS & ~ECHO  |  CBREAK;
+
+
+  /*  Change the interrupt character to ^C, ignore ^S & ^Q 	*/
+
+  ic_chars.t_intrc  = '\003';
+  ic_chars.t_startc = '\377';
+  ic_chars.t_stopc  = '\377';
+
+  ioctl( 0, TIOCSETP, &ic_mode  );
+  ioctl( 0, TIOCSETC, (struct sgttyb *) &ic_chars );
+  }
+
+
+
+
+
+
+
+
+/****************************************************************/
+/*								*/
+/*	Reset_Term()						*/
+/*								*/
+/*		Restore the terminal characteristics.		*/
+/*								*/
+/****************************************************************/
+
+
+Reset_Term()
+
+  {
+  ioctl( 0, TIOCSETP, &saved_mode  );
+  ioctl( 0, TIOCSETC, (struct sgttyb *) &saved_chars );
+  }
+
+
+
+
+
+
+
+
+/****************************************************************/
+/*								*/
+/*	Get_Char()						*/
+/*								*/
+/*		Return the next input character. Upper case	*/
+/*		is mapped to lower case. Escape sequences	*/
+/*		are mapped to special codes (msb set).		*/
+/*								*/
+/****************************************************************/
+
+
+int Get_Char()
+
+  {
+  int c;
+
+
+  /*  fflush() used because Minix does not automatically	*/
+  /*  flush the output.						*/
+
+  fflush( stdout );
+
+
+  if ( (c = Getc()) == EOF )
+    return( EOF );
+  
+  c &= 0x7f;
+
+
+  if ( isupper(c) )
+    return( tolower(c) );
+
+
+  if ( c == ESCAPE )
+    if ( (c=Getc()) != '[' )
+      {
+      ungetc( c, stdin );
+      return( ESCAPE );
+      }
+    else
+      {
+      c = Getc() | 0x80;
+
+      if (  c == ESC_HOME  ||  c == ESC_UP    ||  c == ESC_PGUP   ||
+	    c == ESC_LEFT  ||  c == ESC_5     ||  c == ESC_RIGHT  ||
+	    c == ESC_END   ||  c == ESC_DOWN  ||  c == ESC_PGDN   ||
+	    c == ESC_PLUS  ||  c == ESC_MINUS   )
+	return( c );
+      else
+	return( ESCAPE );
+      }
+
+
+  return( c );
+  }
+
+
+
+
+
+
+
+
+/****************************************************************/
+/*								*/
+/*	Init_Getc( argc, argv )					*/
+/*								*/
+/*		Give Getc() references to the command line	*/
+/*		arguments.					*/
+/*								*/
+/****************************************************************/
+
+
+
+static int    args_remaining;
+static char **args_pointer;
+static int    args_index;
+
+
+
+Init_Getc( argc, argv )
+  int   argc;
+  char *argv[];
+
+  {
+  args_remaining = argc - 1;
+  args_pointer   = &argv[1];
+  args_index     = 0;
+  }
+
+
+
+
+
+
+
+
+/****************************************************************/
+/*								*/
+/*	Getc()							*/
+/*								*/
+/*		Get the next input character from the command	*/
+/*		line if there is some more, else from stdin.	*/
+/*								*/
+/****************************************************************/
+
+
+int Getc()
+
+  {
+  int c;
+
+  if ( args_remaining > 0 )
+    if ( (c = args_pointer[ 0 ][ args_index++ ]) == '\0' )
+      {
+      --args_remaining;
+      ++args_pointer;
+      args_index = 0;
+
+      if ( args_remaining > 0 )
+        return( '\n' );
+      }
+    else
+      return( c );
+
+  return( getchar() );
+  }
+
+
+
+
+
+
+
+
+/****************************************************************/
+/*								*/
+/*	Get_Base( character )					*/
+/*								*/
+/*		Return an appropriate base number for the	*/
+/*		given character code. Used by 'i' and 'o'.	*/
+/*								*/
+/****************************************************************/
+
+
+int Get_Base( code )
+  char code;
+
+  {
+  switch ( code )
+    {
+    case 'h' :		return( HEXADECIMAL );
+
+    case 'd' :		return( DECIMAL     );
+
+    case 'o' :		return( OCTAL       );
+
+    case 'b' :		return( BINARY      );
+
+    case 'a' :  	return( ASCII       );
+
+    default  :		return( ERROR       );
+    }
+  }