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*WordTable)<BR>{<BR>int i=0; /*ComBuf String pointer*/<BR>int
j=0; /*Length of Word */<BR>int k=-1; /*The number of
WordTable*/<BR>int StrFlag=0; /*There is "0-9/a-z/A-Z" before
" ,()"*/<BR>int SentenceEndFlag=0; /*Sentence end*/<BR>char
ch;</P>
<P>WordTable->Num=0;<BR>WordTable->LeftCurveNum=0;<BR>WordTable->RightCurveNum=0;</P>
<P>ch=ComBuf[0];<BR>while(!SentenceEndFlag&&i<MAXLENCOMBUF){<BR>
if((ch>='0'&&ch<='9')||(ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z')||(ch=='.')){<BR>if(StrFlag==0){<BR>StrFlag=1;k=k+1;j=0;<BR>if(k>=MaxLenWordTable)
return
0;<BR>WordTable->wt[k].Str[j]=ch;<BR>WordTable->Num=k+1;<BR>}<BR>else{<BR>j=j+1;<BR>if(j>=MaxLenWord)
return 0;<BR>WordTable->wt[k].Str[j]=ch;<BR>}<BR>}<BR>else
if(ch=='
'||ch==','||ch=='('||ch==')'||ch=='\0'){<BR>if(ch=='(')
WordTable->LeftCurveNum++;<BR>if(ch==')')
WordTable->RightCurveNum++;<BR>if(StrFlag==1){<BR>StrFlag=0;j=j+1;<BR>WordTable->wt[k].Str[j]='\0';<BR>WordTable->wt[k].Length=j;<BR>}<BR>if(ch=='\0')
SentenceEndFlag=1;<BR>}<BR>else{<BR>return
0;<BR>}<BR>i=i+1;<BR>ch=ComBuf[i];<BR>}<BR>if(i<MAXLENCOMBUF||COMBUF[MAXLENCOMBUF]=='\0'){<BR>
if(WordTable->LeftCurveNum==WordTable->RightCurveNum)
return 1;<BR>else return 0;<BR>}<BR>else{<BR>return
0;<BR>}<BR>}</P>
<P>输入回显和命令解释执行<BR>void yyshell(void *yydata)
reentrant<BR>{<BR>yydata=yydata;<BR>clrscr();<BR>PrintStr("\t\t***********************************************\n");<BR>PrintStr("\t\t*
Welcom to use this program *\n");<BR>PrintStr("\t\t*
Author:YangYi 20020715
*\n");<BR>PrintStr("\t\t***********************************************\n\n\n");<BR><BR>/*Login
& Password*/</P>
<P>PrintStr("% ");<BR>while(!ShellEnd){</P>
<P>switch(State){<BR>case
StatInputCom:{<BR>if(yygetch(&ch)){<BR>if(ch==13) /*Enter
return key*/<BR>{<BR>PrintStr("\n");<BR>ComBuf[i+1]='\0';
<BR>if(i+1==0) PrintStr("% ");<BR>else
<BR>State=StatExeCom;<BR>}<BR>else{<BR>i=i+1;<BR>if((i>=MaxLenComBuf)&&(ch!=8)){<BR>PrintChar(7);<BR>i=MaxLenComBuf-1;<BR>}<BR>else{<BR>if(ch==8){<BR>i=i-2;<BR>if(i<-1)
{i=-1;PrintChar(7);}<BR>else{<BR>PrintChar(8);<BR>PrintChar('
');<BR>PrintChar(8);<BR>}<BR>}<BR>else{<BR>PrintChar(ch);<BR>ComBuf[i]=ch;<BR>}<BR>}<BR>}<BR>break;<BR>}<BR>else{<BR>//OSTimeDly(10);<BR>break;<BR>}<BR>}<BR>case
StatExeCom:{<BR>if(GetWord(ComBuf,&WordTable)==1&&WordTable.Num!=0){<BR>yystrlwr(WordTable.wt[0].Str);<BR>for(tem=0;tem<MAXCOMNUM&&!COMMATCHFLAG;TEM++)<BR>
if(yystrcmp(WordTable.wt[0].Str,ComTable[tem])==0)
ComMatchFlag=1;<BR>if(ComMatchFlag){<BR>tem--;<BR>switch(tem){<BR>case
0:{DisplayTask(&WordTable);break;}<BR>case
1:{Kill(&WordTable);break;}<BR>case
2:{PingCommand(&WordTable);break;}<BR>case
3:{UDPCommand(&WordTable);break;}<BR>case
4:{CfgHost(&WordTable);break;}<BR>case
5:{CfgMask(&WordTable);break;}<BR>case
6:{CfgGateway(&WordTable);break;} <BR>case
7:{<BR>//ShellEnd=1;<BR>PrintStr("\n\tThis Command is
limited!\n\n");<BR>break;<BR>}<BR>case
8:{PrintConfig(&WordTable);break;}<BR>case
9:{clrscr();break;}<BR>case
10:{DisplayHelpMenu(&WordTable);break;}<BR>}
<BR>}<BR>else<BR>PrintStr(" Bad
command!\n\n");<BR>}<BR>else{<BR>if(WordTable.Num) PrintStr("
Bad command!\n\n");<BR>}</P>
<P>ComMatchFlag=0;<BR>State=StatInputCom;<BR>if(ShellEnd)
{PrintStr("\n\n");}<BR>else PrintStr("%
");<BR>i=-1;<BR>break;<BR>}<BR>default:{<BR>//ShellEnd=1;<BR>PrintStr("System
fatal
error!\n");<BR>PrintChar(7);PrintChar(7);PrintChar(7);<BR>}<BR>}<BR>}<BR>}</P>
<P>以上是我这次移植uCOS51的一些心得，写出来只是让准备在51上运行操作系统的同行们少走弯路并增强使用信心。我强烈推荐大家在自己的51系统中使用uCOS这个简单实用的自己的操作系统。它的大小应该不是问题，性能上的提高却是显著的。但愿此文能对朋友们有所帮助，错误在所难免，希望读者指正。</P>
<P>参考文献：<BR>1.邵贝贝译. μC/OS-II 源码公开的实时嵌入式操作系统 中国电力出版社</P>
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