symbol.c

c的编译器

#include "global.h"

#define STRMAX 999
#define SYMMAX 100

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

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

    return 0;
}

int insert(s, tok)
    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 += 1;
    symtable[lastentry].token = tok;
    symtable[lastentry].lexptr = &lexemex[lastchar + 1];
    lastchar = lastchar + len + 1;
    strcpy(symtable[lastentry].lexptr, s);
    return lastentry;
}