自制操作系统Antz day11——实现shell(下)命令响应
本文共 10071 字，大约阅读时间需要 33 分钟。
我已经规范了系统代码风格，类似于按照linux分包，把各部分功能区分开了
在之前的任务中，我们已经通过直接操作显卡驱动完成了简单的图形化。
需要了解之前的部分：
直接操作显卡请参考day03
简单图形化的实现请参考day09
键盘按键中断响应请参考day10
Makefile
项目目录
一 . 如何实现命令缓存
在之前已经完成了键盘的响应工作，但这种响应却是有很大的问题，比如说对于一次按键的两次中断处理。后来我把两种中断都加入了响应判断中，这样就不会有之前第10天所提到的bug了。
* 在替换函数中完成识别。修改如下
char* replace_char(char s[40]){ char *chr = "$" ; if((strcmp(s,"1E")==0)||(strcmp(s,"9E")==0)){ chr = "a" ; }else if((strcmp(s,"30")==0)||(strcmp(s,"B0")==0)){ chr = "b" ; } ... // 省略 return chr ; * 这里是一些功能按键的识别修改
// Enter -> 回车键 响应之前缓存的命令 换行 if((strcmp(s,"1C")==0)||(strcmp(s,"9C")==0)){ action_command(binfo); //响应命令 write_x = 58 ; //下面是换行 write_y += 19 ; putfonts8_asc(binfo->vram, binfo->scrnx, 4, write_y, COL8_FFFFFF, "AntzOS>"); } // F1 -> 终端刷新 类似于clear命令 else if((strcmp(s,"3B")==0)||(strcmp(s,"BB")==0)){ //关于F1的响应中断 sprintf(command,"%s",""); // 命令缓存清空 flag = 0 ; // 按键模式回复默认，这个看第10天，本质目的是为了处理一次按键的两次终端 new_pe(binfo); // 通过操作显存直接刷新当前终端 putfonts8_asc(binfo->vram, binfo->scrnx, 4, write_y, COL8_FFFFFF, "AntzOS>"); } // Backspace -> 删格键 else if(strcmp(s,"0E")==0){ // 回退 write_x -= 8 ; boxfill8(binfo->vram, binfo->scrnx , COL8_000000, write_x, write_y, write_x+19, write_y+19); if(write_x<=58){ write_x = 146 ; write_y -= 19 ; } } 这些就是按键识别上目前修改的内容了。
接下来我们要添加一个功能，在每次按键之后，不但在屏幕上显示这个键，而且将他缓存在缓冲区，在下次回车的时候进行识别，并清空。
先来看一个简单的demo
// command数组就是命令缓存区char command[100] = "";void add_command(char *s) { sprintf(command,"%s%s",command,s); }void action_command(){ // 响应} 二 . 实现
command就是一个命令缓存数组，每次按键之后调用add_command()命令将这次的按键保存。
sprintf()这个函数是字符串格式化命令，主要功能是把格式化的数据写入某个字符串中。sprintf 是个变参函数。使用sprintf 对于写入buffer的字符数是没有限制的，这就存在了buffer溢出的可能性。
我们使用sprintf函数直接在command后面添加了s字符。
那么在下次按下Enter的时候，我们只需要调用action_command,并且在里面识别是什么命令，然后做出合适的响应即可。
来看看完整的命令缓冲区实现。
// 指令缓存，但是因为中断响应的时间问题，终端输入速度要非常慢char command[100] = "";void add_command(char *s) { if(strcmp(s," ")==0){ sprintf(command,"%s%s",command,""); }else if(strcmp(s,"$")){ //忽略这种错误输入 }else { sprintf(command,"%s%s",command,s); } }void action_command(struct BOOTINFO *binfo){ // action command 响应命令 // ls命令 // data命令 if(strcmp(command,"data")==0){ // get new data; write_y += 19 ; putfonts8_asc(binfo->vram, binfo->scrnx, 4, write_y, COL8_FFFFFF, "AntzOS in 2018"); }else if(strcmp(command,"cls")==0){ flag = 0 ; new_pe(binfo); }else if(strcmp(command,"version")==0){ write_y += 19 ; putfonts8_asc(binfo->vram, binfo->scrnx, 4, write_y, COL8_FFFFFF, "Antz.version.1.1"); }else if(strcmp(command,"help")==0){ // help内容过多，显示在图形化界面区域 }else if(sizeof(command)>=1){ write_y += 19 ; putfonts8_asc(binfo->vram, binfo->scrnx, 4, write_y, COL8_FFFFFF, "Not Found"); } // 命令缓存清除 sprintf(command,"%s","");} 现在使用Makefile来生成这个支持命令的img镜像。
make img
使用虚拟机打开镜像，结果如下
终端主要代码如下：
int write_x = 55 ;int write_y = 57 ;char* replace_char(char s[40]){ char *chr = "$" ; if((strcmp(s,"1E")==0)||(strcmp(s,"9E")==0)){ chr = "a" ; }else if((strcmp(s,"30")==0)||(strcmp(s,"B0")==0)){ chr = "b" ; }else if((strcmp(s,"2E")==0)||(strcmp(s,"AE")==0)){ chr = "c" ; }else if((strcmp(s,"20")==0)||(strcmp(s,"A0")==0)){ chr = "d" ; }else if((strcmp(s,"12")==0)||(strcmp(s,"92")==0)){ chr = "e" ; }else if((strcmp(s,"21")==0)||(strcmp(s,"A1")==0)){ chr = "f" ; }else if((strcmp(s,"22")==0)||(strcmp(s,"A2")==0)){ chr = "g" ; }else if((strcmp(s,"23")==0)||(strcmp(s,"A3")==0)){ chr = "h" ; }else if((strcmp(s,"17")==0)||(strcmp(s,"97")==0)){ chr = "i" ; }else if((strcmp(s,"24")==0)||(strcmp(s,"A4")==0)){ chr = "j" ; }else if((strcmp(s,"25")==0)||(strcmp(s,"A5")==0)){ chr = "k" ; }else if((strcmp(s,"26")==0)||(strcmp(s,"A6")==0)){ chr = "l" ; }else if((strcmp(s,"32")==0)||(strcmp(s,"B2")==0)){ chr = "m" ; }else if((strcmp(s,"31")==0)||(strcmp(s,"B1")==0)){ chr = "n" ; }else if((strcmp(s,"18")==0)||(strcmp(s,"98")==0)){ chr = "o" ; }else if((strcmp(s,"19")==0)||(strcmp(s,"99")==0)){ chr = "p" ; }else if((strcmp(s,"10")==0)||(strcmp(s,"90")==0)){ chr = "q" ; }else if((strcmp(s,"13")==0)||(strcmp(s,"93")==0)){ chr = "r" ; }else if((strcmp(s,"1F")==0)||(strcmp(s,"9F")==0)){ chr = "s" ; }else if((strcmp(s,"14")==0)||(strcmp(s,"94")==0)){ chr = "t" ; }else if((strcmp(s,"16")==0)||(strcmp(s,"96")==0)){ chr = "u" ; }else if((strcmp(s,"2F")==0)||(strcmp(s,"AF")==0)){ chr = "v" ; }else if((strcmp(s,"11")==0)||(strcmp(s,"91")==0)){ chr = "w" ; }else if((strcmp(s,"2D")==0)||(strcmp(s,"AD")==0)){ chr = "x" ; }else if((strcmp(s,"15")==0)||(strcmp(s,"95")==0)){ chr = "y" ; }else if((strcmp(s,"2C")==0)||(strcmp(s,"AC")==0)){ chr = "z" ; }else if((strcmp(s,"39")==0)||(strcmp(s,"B9")==0)){ chr = " " ; } return chr ;}int flag = 1 ;// 指令缓存，但是因为中断响应的时间问题，终端输入速度要非常慢char command[100] = "";void add_command(char *s) {/*if(strcmp(s," ")==0){ sprintf(command,"%s%s",command,"");}else if(strcmp(s,"$")){ //忽略这种错误输入 }else { }*/ sprintf(command,"%s%s",command,s);}void action_command(struct BOOTINFO *binfo){ // action command // ls // data if(strcmp(command,"data")==0){ // get new data; write_y += 19 ; putfonts8_asc(binfo->vram, binfo->scrnx, 4, write_y, COL8_FFFFFF, "AntzOS in 2018"); }else if(strcmp(command,"cls")==0){ flag = 0 ; new_pe(binfo); }else if(strcmp(command,"version")==0){ write_y += 19 ; putfonts8_asc(binfo->vram, binfo->scrnx, 4, write_y, COL8_FFFFFF, "Antz.version.1.1"); }else if(strcmp(command,"help")==0){ // help内容过多，显示在图形化界面区域 }else if(sizeof(command)>=1){ write_y += 19 ; putfonts8_asc(binfo->vram, binfo->scrnx, 4, write_y, COL8_FFFFFF, "Not Found"); } // 命令缓存清除 sprintf(command,"%s","");}void key(struct BOOTINFO *binfo,char s[40]){ if((strcmp(s,"1C")==0)||(strcmp(s,"9C")==0)){ action_command(binfo); write_x = 58 ; write_y += 19 ; putfonts8_asc(binfo->vram, binfo->scrnx, 4, write_y, COL8_FFFFFF, "AntzOS>"); }else if((strcmp(s,"3B")==0)||(strcmp(s,"BB")==0)){ //关于F1的响应中断 sprintf(command,"%s",""); flag = 0 ; new_pe(binfo); putfonts8_asc(binfo->vram, binfo->scrnx, 4, write_y, COL8_FFFFFF, "AntzOS>"); }else if(strcmp(s,"0E")==0){ // 回退 write_x -= 8 ; boxfill8(binfo->vram, binfo->scrnx , COL8_000000, write_x, write_y, write_x+19, write_y+19); if(write_x<=58){ write_x = 146 ; write_y -= 19 ; } }else { //putfonts8_asc(binfo->vram, binfo->scrnx, write_x, write_y, COL8_FFFFFF, s); putfonts8_asc(binfo->vram, binfo->scrnx, write_x, write_y, COL8_FFFFFF, replace_char(s)); add_command(replace_char(s)); write_x += 8 ; // 添加响应区 //清除 //boxfill8(binfo->vram, binfo->scrnx, COL8_008400 , 300 ,240 ,310 ,250); //打印字符 Only use debug //putfonts8_asc(binfo->vram, binfo->scrnx, 300, 240 ,COL8_000000, s) ; } if(write_x>148){ write_x = 58 ; write_y += 19 ; //putfonts8_asc(binfo->vram, binfo->scrnx, 4, 57, COL8_FFFFFF, "AntzOS>"); } if(write_y>180){ new_pe(binfo); putfonts8_asc(binfo->vram, binfo->scrnx, 4, write_y, COL8_FFFFFF, "AntzOS>"); }}void main(void){ struct BOOTINFO *binfo = (struct BOOTINFO *) ADR_BOOTINFO; char s[40], mcursor[256], keybuf[32], mousebuf[128]; int mx, my, i; init_gdtidt(); init_pic(); io_sti(); /* PIC的初始化已经完成*/ fifo8_init(&keyfifo, 32, keybuf); fifo8_init(&mousefifo, 128, mousebuf); io_out8(PIC0_IMR, 0xf9); /* 开放PIC1和键盘中断(11111001) */ io_out8(PIC1_IMR, 0xef); /* 开放鼠标中断(11101111) */ init_keyboard(); init_palette(); init_screen8(binfo->vram, binfo->scrnx, binfo->scrny); putfonts8_asc(binfo->vram, binfo->scrnx, 0, 0, COL8_FFFFFF, "Terminal-Antz"); putfonts8_asc(binfo->vram, binfo->scrnx, 0, 0, COL8_000000, "Terminal-Antz"); putfonts8_asc(binfo->vram, binfo->scrnx, 107, 0, COL8_000000, "|-|o|x|"); putfonts8_asc(binfo->vram, binfo->scrnx, 4, 19, COL8_FFFFFF, "AntzOS> SayHello()"); putfonts8_asc(binfo->vram, binfo->scrnx, 4, 38, COL8_FFFFFF, "Hello My AntzOs."); putfonts8_asc(binfo->vram, binfo->scrnx, 4, 57, COL8_FFFFFF, "AntzOS>_"); for (;;) { io_cli(); if (fifo8_status(&keyfifo) + fifo8_status(&mousefifo) == 0) { io_stihlt(); } else { if (fifo8_status(&keyfifo) != 0) { i = fifo8_get(&keyfifo); io_sti(); sprintf(s, "%02X", i); if (flag){ key(binfo,s); } if(flag==1){ flag = 0 ; }else { flag = 1 ; } } } }}void new_pe(struct BOOTINFO *binfo){ write_x = 58 ; write_y = 19 ; // 右边并没有保存 init_screen8(binfo->vram, binfo->scrnx, binfo->scrny); putfonts8_asc(binfo->vram, binfo->scrnx, 0, 0, COL8_FFFFFF, "Terminal-Antz"); putfonts8_asc(binfo->vram, binfo->scrnx, 0, 0, COL8_000000, "Terminal-Antz"); putfonts8_asc(binfo->vram, binfo->scrnx, 107, 0, COL8_000000, "|-|o|x|"); // 此处保留此输出，交给调用者自己 // putfonts8_asc(binfo->vram, binfo->scrnx, 4, write_y, COL8_FFFFFF, "AntzOS>");}
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