Visual Basic Source Code/Visual Basic Source Code.iso/vbsource/vbdatabs/terminal.cpp

C/C++ Source or Header | 1999-03-14 | 16.0 KB | 716 lines

// ------------------------------- //
// -------- Start of File -------- //
// ------------------------------- //
// ----------------------------------------------------------- //
// C++ Source Code File Name: terminal.cpp
// Compiler Used: MSVC40, DJGPP 2.7.2.1, GCC 2.7.2.1, HP CPP 10.24
// Produced By: Doug Gaer
// File Creation Date: 03/21/1997
// Date Last Modified: 03/15/1999
// Copyright (c) 1997 Douglas M. Gaer
// ----------------------------------------------------------- //
// ------------- Program Description and Details ------------- //
// ----------------------------------------------------------- //
/*
The VBD C++ classes are copyright (c) 1997, by Douglas M. Gaer.
All those who put this code or its derivatives in a commercial
product MUST mention this copyright in their documentation for
users of the products in which this code or its derivative
classes are used. Otherwise, you have the freedom to redistribute
verbatim copies of this source code, adapt it to your specific
needs, or improve the code and release your improvements to the
public provided that the modified files carry prominent notices
stating that you changed the files and the date of any change.

THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND.
THE ENTIRE RISK OF THE QUALITY AND PERFORMANCE OF THIS SOFTWARE
IS WITH YOU. SHOULD ANY ELEMENT OF THIS SOFTWARE PROVE DEFECTIVE,
YOU WILL ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR
CORRECTION.

This is a terminal interface designed to be portable between
DOS and UNIX systems. On UNIX systems the "curses" library is
used to create terminal independent code. On MSDOS/Windows95
systems the ANSI.SYS driver is used to simulate the basic
functions of the "curses" library.
*/
// ----------------------------------------------------------- //
#include <ctype.h>
#include <string.h>
#include "terminal.h"

#ifdef __DOS__
#include <iostream.h>
#include <iomanip.h>
#endif

#ifdef __UNIX__
#include <sys/time.h>
#include <termio.h>
#endif

Terminal I_TERM;              // Independent Teminal type object
Terminal *terminal = &I_TERM; // Global terminal pointer

void Terminal::GetString (char *string, int x, int y)
// This function allows the user to enter a single string.
// It was added to echo each character without having to
// to turn the echo on. This will allow the uesr to edit
// the entry using the backspace or other defined keys.
{
  char ch;
  int charcount = 0;

  if (x != -1) move (y, x);

  while (1) {
    ch = getch();
    if (ch == '\n' || ch == '\r' || ch == CONTROL('c')) {
      *string = 0;
      return;
    }

    if (ch == '\b' || ch == CONTROL('d')) { // Delete keys
      if (charcount > 0) {
    string--;
    charcount--;
    Write('\b');
    Write(' ');
    Write('\b');
      }
    }
    else {
      *string++ = ch;
      charcount++;
      Write(ch);
    }
    refresh();
  }
}

void Terminal::GetPassword (char *string, int x, int y)
// This function allows the user to enter a password
// and echo an asterisk for each character typed.
{
  char ch;
  int charcount = 0;

  if (x != -1) move (y, x);

  while (1) {
    ch = getch();
    if (ch == '\n' || ch == '\r' || ch == CONTROL('c')) {
      *string = 0;
      return;
    }

    if (ch == '\b' || ch == CONTROL('d')) { // Delete keys
      if (charcount > 0) {
    string--;
    charcount--;
    Write('\b');
    Write(' ');
    Write('\b');
      }
    }
    else {
      *string++ = ch;
      charcount++;
      Write('*');
    }
    refresh();
  }
}

int Terminal::GetInt(int x, int y)
// Get a signed int value.
{
  char buf[100];
  GetString(buf, x, y);
  return atoi(buf);
}

long Terminal::GetLong(int x, int y)
// Get a signed long value.
{
  char buf[100];
  GetString(buf, x, y);
  return atol(buf);
}

double Terminal::GetFloat(int x, int y)
// Get a floating point value
{
  char buf[100];
  GetString(buf, x, y);
  return atof(buf);
}

int Terminal::YesNo(int x, int y)
{
  if(x == -1)
    Write(" <Do you wish to continue (y/n)> "); // Same line message
  else
    Write("Do you wish to continue (y/n)...", x, y);

  char c = ' ';
  while (c != 'y' && c != 'n')    {
    c = GetChar();
    c = tolower(c);
  }
  return c == 'y' ? 1: 0; // return true if users answers yes
}

int Terminal::YesNo(const char *s, int x, int y)
{
  if(x == -1)
    Write(s); // Same line message
  else
    Write(s, x, y);

  char c = ' ';
  while (c != 'y' && c != 'n')    {
    c = GetChar();
    c = tolower(c);
  }
  return c == 'y' ? 1: 0; // return true if users answers yes
}

int Terminal::GetYesNo()
// Wait for y/n reply with no prompt.
{
  char c = ' ';
  while (c != 'y' && c != 'n')    {
    c = GetChar();
    c = tolower(c);
  }
  return c == 'y' ? 1: 0; // return true if users answers yes
}

void Terminal::PutBack(char c)
// Put back a keyboard character
{
  putback = c;
}

int Terminal::Center(const char *s) const
// Returns the center coordinate for a string.
{
  int len = strlen(s);
  if(len > MaxCols()-1) len = MaxCols()-1;
  int mid = MaxCols()/2 - 1;
  int half = len/2;
  return mid - half;
}

int Terminal::Center(char *s)
// Returns the center coordinate for a string.
{
  int len = strlen(s);
  if(len > MaxCols()-1) len = MaxCols()-1;
  int mid = MaxCols()/2 - 1;
  int half = len/2;
  return mid - half;
}

int Terminal::ScreenCenter(const int offset) const
// Returns the center coordinate for the screen.
{
  int buf = offset;
  if(buf > MaxLines()-1) buf = MaxLines()-1;
  int mid = MaxLines()/2 - 1;
  int half = buf/2;
  return mid - half;
}

int Terminal::ScreenCenter(int offset)
// Returns the center coordinate for the screen.
{
  if(offset > MaxLines()-1) offset = MaxLines()-1;
  int mid = MaxLines()/2 - 1;
  int half = offset/2;
  return mid - half;
}

int Terminal::Right(const char *s) const
// Returns the right justifed coordinate for a string.
{
  int len = strlen(s);
  if(len > MaxCols()-1) len = MaxCols()-1;
  int end = MaxCols()-1;
  return end - len;
}

int Terminal::Right(char *s)
// Returns the right justifed coordinate for a string.
{
  int len = strlen(s);
  if(len > MaxCols()-1) len = MaxCols()-1;
  int end = MaxCols()-1;
  return end - len;
}

void Terminal::StatusLine(const char *s) const
// Display a status line in normal text mode.
{
  Write(s, 0, MaxLines()-1);
  int len = strlen(s);
  while (len++ < MaxCols()-1) Write(' ');
}

void Terminal::StatusLine(char *s)
// Display a status line in normal text mode.
{
  Write(s, 0, MaxLines()-1);
  int len = strlen(s);
  while (len++ < MaxCols()-1) Write(' ');
}

void Terminal::ClearLine(int x, int y) const
{
  int i = 0;
  if(x == -1)
    while (i++ < MaxCols()-1) Write(' ');
  else {
    MoveCursor(x, y);
    while (i++ < MaxCols()-1) Write(' ');
  }
}

void Terminal::ClearLine(int x, int y)
{
  int i = 0;
  if(x == -1)
    while (i++ < MaxCols()-1) Write(' ');
  else {
    MoveCursor(x, y);
    while (i++ < MaxCols()-1) Write(' ');
  }
}

void Terminal::MoveCursor(int x, int y) const
{
  move(y, x);
  refresh();
}

void Terminal::MoveCursor(int x, int y)
{
  move(y, x);
  refresh();
}

void Terminal::ClearScreen() const
{
  clear();
}

void Terminal::ClearScreen()
{
  clear();
}

void Terminal::AnyKey(int x, int y)
// Prompt the user for any key to continue
{
  if(x == -1) {
    Write(" <Press any key to continue> "); // Same line message
    GetChar();
    return;
  }
  Write("Press any key to continue...", x, y);
  GetChar();
}

void Terminal::AnyKey(const char *s, int x, int y)
// Prompt the user for any key to continue
{
  if(x == -1) {
    Write(s); // Same line message
    GetChar();
    return;
  }
  Write(s, x, y);
  GetChar();
}

void Terminal::Write(const unsigned char c, int x, int y) const
// Write a unsigned character to the screen.
{
  if (x != -1) move (y, x);
  char s[1];
  s[0] = c;    // Copy char into a string buffer
  s[1] = '\0'; // Null terminate the string
  addstr(s);
  refresh();
}

void Terminal::Write(unsigned char c, int x, int y)
// Write a unsigned character to the screen.
{
  if (x != -1) move (y, x);
  char s[1];
  s[0] = c;    // Copy char into a string buffer
  s[1] = '\0'; // Null terminate the string
  addstr(s);
  refresh();
}

void Terminal::Write(const char c, int x, int y) const
// Write a signed character to the screen.
{
  if (x != -1) move (y, x);
  char s[1];
  s[0] = c;    // Copy char into a string buffer
  s[1] = '\0'; // Null terminate the string
  addstr(s);
  refresh();
}

void Terminal::Write(char c, int x, int y)
// Write a signed character to the screen.
{
  if (x != -1) move (y, x);
  char s[1];
  s[0] = c;    // Copy char into a string buffer
  s[1] = '\0'; // Null terminate the string
  addstr(s);
  refresh();
}

void Terminal::Write(const char *s, int x, int y) const
// Write a single string to the screen.
{
  if (x != -1) move (y, x);
  addstr(s);
  refresh();
}

void Terminal::Write(char *s, int x, int y)
// Write a single string to the screen.
{
  if (x != -1) move (y, x);
  addstr(s);
  refresh();
}

void Terminal::Write(const long val, int x, int y) const
// Write a signed long int to the screen.
{
  char buf[100];
  sprintf(buf, "%d", val);
  Write(buf, x, y);
}

void Terminal::Write(long val, int x, int y)
// Write a signed long int to the screen.
{
  char buf[100];
  sprintf(buf, "%d", val);
  Write(buf, x, y);
}

void Terminal::Write(const int val, int x, int y) const
// Write a signed int to the screen.
{
  char buf[100];
  sprintf(buf, "%d", val);
  Write(buf, x, y);
}

void Terminal::Write(int val, int x, int y)
// Write a signed int to the screen.
{
  char buf[100];
  sprintf(buf, "%d", val);
  Write(buf, x, y);
}

void Terminal::Write(const double val, int x, int y) const
// Write a floating point value to the screen.
{
  char buf[100];
  sprintf(buf, "%.2f", val);
  Write(buf, x, y);
}

void Terminal::Write(double val, int x, int y)
// Write a floating point value to the screen.
{
  char buf[100];
  sprintf(buf, "%.2f", val);
  Write(buf, x, y);
}

void Terminal::Write(const float val, int x, int y) const
// Write a floating point value to the screen.
{
  char buf[100];
  sprintf(buf, "%.2f", val);
  Write(buf, x, y);
}

void Terminal::Write(float val, int x, int y)
// Write a floating point value to the screen.
{
  char buf[100];
  sprintf(buf, "%.2f", val);
  Write(buf, x, y);
}

void Terminal::StandOut(const char *s, int x, int y) const
// Write text in stand out mode.
{
  if (x != -1) move (y, x);
  standout();
  addstr(s);
  standend();
  refresh();
}

void Terminal::StandOut(char *s, int x, int y)
// Write text in stand out mode.
{
  if (x != -1) move (y, x);
  standout();
  addstr(s);
  standend();
  refresh();
}

unsigned char Terminal::GetChar()
// Input a keyboard charater (unbuffered) with out waiting
// for the RETURN key.
{
  int c;
  if(putback) {
    c = putback;
    putback = 0;
  }
  else {
    c = getch();
    if (c == 0) // Convert function key
      c = getch() | 0x80;
    else // Strip scan code
      c &= 0xff;
  }
  return (unsigned char)(c);
}

int Terminal::KBWait() const
// Test for a keyboard character waiting. Continue processing until
// the user interrupts by hitting a key.
{
#ifdef __DOS__
  return kbhit();
#endif

#ifdef __UNIX__
  fd_set readfds, writefds, exceptfds;
  struct timeval timeout;
  static struct termio otty, ntty;
  int ret;

  // Create proper environment for select()
  FD_ZERO( &readfds );
  FD_ZERO( &writefds );
  FD_ZERO( &exceptfds );
  FD_SET( fileno(stdin), &readfds );

  // We shall specify 0.5 sec as the waiting time
  timeout.tv_sec  = 0;     // 0 seconds
  timeout.tv_usec = 500; // 500 microseconds

  int fd = 0;

  // Put tty in raw mode
  ioctl(fd, TCGETA, &otty);
  ntty = otty;
  ntty.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL);
  ntty.c_lflag &= ~ICANON;
  ntty.c_lflag |= ISIG;
  ntty.c_cflag &= ~(CSIZE|PARENB);
  ntty.c_cflag |= CS8;
  ntty.c_iflag &= (ICRNL|ISTRIP);
  ntty.c_cc[VMIN] = 1;
  ntty.c_cc[VTIME] = 1;
  ioctl(fd, TCSETAW, &ntty);

  // Do a select
  ret = select( 1, &readfds, &writefds, &exceptfds, &timeout );

  // Reset the tty back to its original mode
  ioctl(fd, TCSETAW, &otty);

  return( ret );
#endif
}

void Terminal::init()
{
#ifdef __UNIX__

// Removed: causes core dump if term varible is set incorrectly (ie: dec-vt320)
// newterm(getenv("TERM"), stdout, stdin);

  initscr();            // initialize the curses library
  keypad(stdscr, TRUE); // enable keyboard mapping
  idlok(stdscr, TRUE);  // enable terminal insert and delete line features
  nonl();               // tell curses not to do NL->CR/NL on output
  noecho();             // don't echo input
  raw();                // Allows the program to mask Ctrl-C

  // Curses input modes
  // cbreak();   // Send all characters to program except Ctrl-C,S,Q, and Z
  // nocbreak(); // Nothing is sent to the program until the users hits return
  // raw();      // All charaters are sent immediately to the program
  // noraw();    // Turn off raw mode

  maxcols = COLS;
  maxlines = LINES;

#endif

#ifdef __DOS__
  // Simulate an initscr() call
  cout << "\033[m"; // Normal text attributes
  cout.flush();
  clear();
  maxcols = COLS;
  maxlines = LINES;
  move(0, 0);
  refresh();
#endif
}

void Terminal::finish()
{
  clear();
  endwin();
}

void Terminal::SetMaxLines(int lines)
{
  if(lines > LINES)
    maxlines = LINES;
  else
    maxlines = lines;
}

void Terminal::SetMaxCols(int cols)
{
  if(cols > COLS)
    maxcols = COLS;
  else
    maxcols = cols;
}

#ifdef __DOS__
// ===============================================================
// Stand alone functions used to port this code from UNIX to DOS,
// Windows 3.11, and Windows 95. These functions are used to
// simulate the basic functionality of the vast CURSES library.
// All of these functions rely on the ANSI.SYS driver installed
// in the "config.sys" file: DEVICEHIGH=C:\WINDOWS\COMMAND\ANSI.SYS
// in Windows 95 or DEVICEHIGH=C:\DOS\ANSI.SYS in DOS/Windows 3.11.
// ===============================================================
int LINES = 25; // PC terminal the maximum screen height
int COLS  = 80; // PC terminal the maximum screen width

int addch(const chtype c)
{
  cout << (unsigned char)c;
  cout.flush();
  return OK;
}

int addstr(const char *s)
{
  if(s) cout << s;
  cout.flush();
  return OK;
}

int beep()
{
  cout << '\a';
  return OK;
}

int clear()
{
  cout << "\033[2J";
  cout.flush();
  return OK;
}

int endwin()
{
  cout << "\033[m"; // Normal text attributes
  cout.flush();
  clear();
  move(0, 0);
  return OK;
}

int move(int y, int x)
{
  cout << "\033[" << (y+1) << ';' << (x+1) << 'H';
  cout.flush();
  return OK;
}

int refresh()
{
  return OK;
}

int standend()
{
  cout << "\033[m"; // Normal text attributes
  cout.flush();
  return OK;
}

int standout()
{
  cout << "\033[7m"; // Reverse video text attribute
  cout.flush();
  return OK;
}
// ===============================================================
// The folling code is used for PC enhancements, used to emulate
// the effect of the video attribute functions in the curses library.
// All of the escape codes are compatible with vt100 terminals.

void UnderlineText()
{
  cout << "\033[4m";
  cout.flush();
}

void BoldText()
{
  cout << "\033[1m";
  cout.flush();
}

void ReverseVideo()
{
  cout << "\033[7m";
  cout.flush();
}

void NormalText()
{
  cout << "\033[m"; // Normal text attributes
  cout.flush();
}
// ===============================================================
#endif // __DOS__

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// ------------------------------- //
// --------- End of File --------- //
// ------------------------------- //