實現一個最簡單的VIM文字編輯器(可能有bug，隨便寫了一個)

簡單的寫了一個文字編輯器，功能很簡單，但足以把檔案IO相關的操作熟悉了，可能功能或者分配的大小還不夠完善。請參考參考：

#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};//退出文字編輯器int exit_editor(){    printf("exit editor!\n");    memset(buffer, 0,1024*1024);    system("cls");    return -1 ;}//文本編輯模式int text_editor_mode(){    int flag ;    char input_ch = 0 ;    flag = 0 ;    count = 0 ;    system("cls");    //進入編輯文字模式    printf("\a");    //清空數組    while(1)    {       input_ch = getch();       //ESC按鍵       if(input_ch == 0x1B)       {           printf("exit editor\n");           system("cls");           flag = 1 ;           return flag ;       }       //ENTER按鍵---->實現文字編輯器換行       if(input_ch == 0x0d)       {           putchar('\n');       }       //輸入的內容不是ESC按鍵的情況下就將文本資訊儲存到數組裡去       if(input_ch != 0x1B)       {           buffer[count] = input_ch ;           putchar(input_ch);           count++;       }    }}//文本儲存模式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 ;}//讀取一個檔案的資訊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 ;    //重新開始    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 ;}