void getToken(){
char* p = currToken.mStr;
/* skip the blank */
while ((*p = getchar()) == ' '){};
if (isalnum(*p)){
/* copy string until find the next blank */
while(isalnum( *++p = getchar()));
ungetc(*p,stdin);
*p = '\0';
currToken.mType = classify_string();
return ;
}
/* the 'type' descriptor is follow with the '*' */
if(*p == '*'){
strcpy(currToken.mStr,"pointer to");
currToken.mType = *p;
return;
}
currToken.mStr[1] = '\0';
currToken.mType = *p;
return;
}
/*
Read the next token into this.string
if it is alphanumeric, classify_string
else it must be a single character token
this.type = the token itself; terminate this.string
with a nul.
*/
void get_token() {
char c = 'a';
while((c = getchar()) != EOF) {
if(isspace(c)) continue;
else break;
}
if(c == EOF) {
curr_token.type = END;
return;
}
if(isalnum(c) || c == '_') {
int i = 0;
while(isalnum(c) || c == '_') {
curr_token.string[i++] = c;
c = getchar();
}
curr_token.string[i] = 0;
ungetchar(c);
curr_token.type = classify_string();
return;
}
curr_token.type = c;
if(c == '*') {
strcpy(curr_token.string, "pointer to ");
}
else {
curr_token.string[0] = c;
curr_token.string[1] = 0;
}
}
void gettoken(void){
/* 读入下一个标记,保存在"cur"中 */
char *p = cur.string;
/* 略过所有空白符 */
while((*p = getchar()) == ' ');
if(isalnum(*p)){
/* 在标识符中读入a-z, 0-9开头 */
while(isalnum(*++p = getchar()));
ungetc(*p, stdin);
*p = '\0';
cur.type = classify_string();
return;
}
if(*p == '*'){
strcpy(cur.string, "pointer to ");
cur.type = '*';
return;
}
cur.string[1] = '\0';
cur.type = *p;
return;
}
