symbol.c

简单编译器

char lexemes[STRMAX];
int lastchar = -1;
struct entry symtable[SYMMAX];
int lastentry = 0;

int lookup(char s[])
{
	int p,k=0,t;                    
	for (p= lastentry;p>0;p=p-1)
	     if (strcmp(s,symtable[p].lexptr) == 0)                                            // printf("\nthetable[%d] is %s<_>%s\n",p,symtable[p].lexptr,s);
  	         return p; 
     return 0;                                         //	t=strcmp(s,symtable[p].lexptr); printf("\n%d\n",t);             
 }   


int insert(char s[],int tok)
{
	int len;
	len = strlen(s);
	if(lastentry + 1>= SYMMAX)
		error("symbol table full");
	if(lastchar +len +1>=STRMAX)
		error("lexemes array full");
	lastentry = lastentry + 1;
	symtable[lastentry].token = tok;
	symtable[lastentry].lexptr = &lexemes[lastchar + 1];
	lastchar = lastchar +len +1;
	strcpy(symtable[lastentry].lexptr,s);
	return lastentry;
}