终端程序getchar改为getch

来源：互联网发布：nodejs mysql github 编辑：程序博客网时间：2024/06/05 00:25

#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

#define ESC_KEY 0x1b
char table[255];

static int getch();
int main(int argc, char **argv)
{
int ch;
unsigned int length=0;

memset(table,'\0',255);
printf("\r\n->");
while( 1 )
{
                //printf( "\r\nch_c=%c ,ch_x=%02x",ch,ch);
  ch = getch();
  if(ch == 0x08)
  {
   if(length > 0)
   {
    length--;
    printf("%c",ch);
    printf("%c",table[length] = 0x20);
    printf("%c",ch);
    printf("%c",table[length] = '\0');
   }
  }
  else
  {
   printf("%c",table[length] = ch);
   length++;
  }
}
return 0;
}

static int getch(void)
{
struct termios oldt,newt;
int ch;

        if (!isatty(STDIN_FILENO)) {
                fprintf(stderr, "this problem should be run at a terminal\n");
                exit(1);
        }
        // save terminal setting
        if(tcgetattr(STDIN_FILENO, &oldt) < 0) {
                perror("save the terminal setting");
                exit(1);
        }

        // set terminal as need
        newt = oldt;
        newt.c_lflag &= ~( ICANON | ECHO );
        if(tcsetattr(STDIN_FILENO,TCSANOW, &newt) < 0) {
                perror("set terminal");
                exit(1);
        }

ch = getchar();

        // restore termial setting
        if(tcsetattr(STDIN_FILENO,TCSANOW,&oldt) < 0) {
                perror("restore the termial setting");
                exit(1);
        }
        return ch;
}