/**** symbol. c ********************************************/

#include "global.h"

#define STRMAX 999 
#define SYMMAX 100

/* size of lexemes array /* size of symtable */


char lexemes[STRMAX];
int lastchar = - 1; 		/* last used position in lexemes*/
struct entry symtable[SYMMAX];
int lastentry = 0; 		/* last used position in symtable */

int lookup(char s[])		/* returns position of entry for s */
{
    int p;
    for (p = lastentry; p > 0; p = p - 1)
	if (strcmp(symtable[p].lexptr, s) == 0)
	    return p;
    return 0;
}




int insert(char s[ ], int tok)	/* returns position of entry for s */
{
    int len;
    len = strlen(s); 		/* strlen computes length of 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;
}