getch.c

一个实现基本功能的shell命令解释器

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

int getch(void)
{
	struct termios tm, tm_old;
	int fd = STDIN_FILENO;
	char c;
	if(tcgetattr(fd, &tm) < 0)
		printf("error!\n");
	if(tcgetattr(fd, &tm_old) < 0)
		printf("error!\n");
	cfmakeraw(&tm);
	if(tcsetattr(fd, TCSANOW, &tm) < 0)
		printf("error!\n");
	c = fgetc(stdin);
	if(tcsetattr(fd, TCSANOW, &tm_old) < 0)
		printf("error!\n");
	if(c == 0x38 || c == 0x32)
	{
		if(c == 0x38)
		{
			return -2;
		}
		else
		{
			return -1;
		}
	}
	else
	{
		return c;
	}
}