实现一个最简单的VIM文本编辑器(可能有bug，随便写了一个)

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
#include <fcntl.h>
int count ;
char ch = 0;
char file_name[20]={0};
char buffer[1024*1024]={0};
//退出文本编辑器
int exit_editor()
{
printf("exit editor!\n");
memset(buffer, 0,1024*1024);
system("cls");
return -1 ;
}
//文本编辑模式
int text_editor_mode()
{
int flag ;
char input_ch = 0 ;
flag = 0 ;
count = 0 ;
system("cls");
//进入编辑文本模式
printf("\a");
//清空数组
while(1)
{
input_ch = getch();
//ESC按键
if(input_ch == 0x1B)
{
printf("exit editor\n");
system("cls");
flag = 1 ;
return flag ;
}
//ENTER按键---->实现文本编辑器换行
if(input_ch == 0x0d)
{
putchar('\n');
}
//输入的内容不是ESC按键的情况下就将文本信息保存到数组里去
if(input_ch != 0x1B)
{
buffer[count] = input_ch ;
putchar(input_ch);
count++;
}
}
}

//文本保存模式
int save_text_mode()
{
int flag ;
flag = 0 ;
system("cls");
printf("plase input file name\n");
scanf("%s",file_name);
int openfd = open(file_name,O_CREAT | O_TRUNC | O_RDWR);
if(-1 == openfd){
printf("open file fair!\n");
memset(buffer, 0,1024*1024);
memset(file_name,0,20);
return -1 ;
}
write(openfd,buffer,count);
printf("save file success\n");
memset(buffer, 0,1024*1024);
memset(file_name,0,20);
close(openfd);
printf("file save success!file_name:%s\n",file_name);
system("cls");
flag = 1 ;
return flag ;
}

//读取一个文件的信息
int read_file()
{
char *file = NULL;
char *file_buffer = NULL ;
system("cls");
int fle_flag = 0 ;
int count_fd ;
file = malloc(20);
file_buffer = malloc(1024);
printf("please input file name!\n");
scanf("%s",file);
system("cls");
printf("please input file size!\n");
scanf("%d",&count_fd);
int fd = open(file,O_RDONLY);
if(-1 == fd)
fprintf(stderr,"open file error");
system("cls");
int i ;
read(fd,file_buffer,count_fd);
for(i = 0 ; i < count_fd ; i++)
{
printf("%c",file_buffer[i]);
}
while(1)
{
char rch = getch();
if(rch == 0x1B){
system("cls");
break ;
}
}
free(file);
free(file_buffer);
close(fd);
fle_flag = 1 ;
return fle_flag ;
}
int main(void)
{
int file_fd = -1;
int ret = 0;
int exit_ret = 0;
int save_ret = 0;
int read_ret = 0 ;
//重新开始
Rep:
printf("Welcome to yyx develop VIM-EDITUO\n");
printf("please input i to editor ,r to read ,  w to save , q to quit\n");
while(1)
{
ch = getch();
switch(ch)
{
case 'w':  save_ret = save_text_mode(); break ;
case 'i':  ret = text_editor_mode();    break ;
case 'q':  exit_ret = exit_editor();    break ;
case 'r':  read_ret = read_file();      break ;
}
if(ret == 1 || save_ret == 1 || read_ret == 1)
goto Rep ;
if(exit_ret == -1)
break ;
}
return 0 ;
}