c:string:strtrm

int lfttrm(char* str) {

   int len = 0;
   char* tmp;
   
   len = (int)strlen(str);
   if(0 == len) return len;
   
   tmp = str;
   while(len > 0){
        if(0x20 == *tmp){
                tmp++; len--;
        }
        else if(len > 1){
             if((char)0x81 == *tmp && (char)0x40 == *(tmp+1)){
                  tmp += 2; len -= 2;
             }
             else break;
        }
        else break;
   }    
   strcpy(str, tmp);
   
   return len;

} int rgttrm(char* str) {

   int len;
   char* tmp;
   
   len = (int)strlen(str);
   if(0 == len) return len;
   
   tmp = str+len-1;
   while(len > 0){
       if(0x20 == *tmp){
            *tmp = '\0';
            tmp--; len--;
       }
       else if(len > 1){
            if((char)0x40 == *tmp && (char)0x81 == *(tmp-1)){
                  *tmp = '\0'; *(tmp+1) = '\0';
                  tmp -= 2; len -= 2;
            }
            else break;
       }
       else break;
   }
   //strcpy(str, tmp);
   return len;

} char *strtrm(char* str) {

   int len;
   char ch;
   
   lfttrm(str);

   rgttrm(str);
   
   return str;
   

}