like editor

likeeditor.cpp

#include <iostream>
#include <string>
#include <cstdio>
#include <cstdlib>
#include <termios.h>
#include <unistd.h>
using namespace std;
static struct termios t_orig;

void begin_getch(void) 
{
  struct termios t;

  tcgetattr(0, &t);
  t_orig = t;
  t.c_lflag &= ~(ICANON | ECHO);
  t.c_cc[VMIN] = 0;
  t.c_cc[VTIME] = 0;
  tcsetattr(0, TCSANOW, &t);
  system("clear");
}


char getch(void) 
{
  char c;
  return (read(0, &c, 1) != 0) ? c : 0;
}


void putch(char c) 
{
  write(1, &c, 1);
}


void end_getch(void) 
{
  tcsetattr(0, TCSADRAIN, &t_orig);
}


int main() 
{
	string str;
	char c, cstr[0xFFFF] = { 0 };

	cout << "Things like Vim \nCopyright(C) 2015 MAEKAWATOSHIKI." << endl;
	getchar();
	system("clear");

	begin_getch();

	while(1) 
	{
		usleep(20000);
		if ( (c = getch()) != 0 )
		{
			if(c == 127)
			{
				if(str.size() != 0)
				{	
					str.erase(--str.end());
					system("clear");
					sprintf(cstr, "%s", str.c_str());
					write(1, &cstr, str.size()+1);
				}
			}
			else
			{
				str += c;
				sprintf(cstr, "%s", str.c_str());
				putch(c);
			}
		}
	}
	end_getch();
}