1 #include <u.h>
2 #include <libc.h>
3 #include "hoc.h"
4 #include "y.tab.h"
5 
6 static Symbol *symlist = 0;  /* symbol table: linked list */
7 
8 Symbol*
9 lookup(char* s)	/* find s in symbol table */
10 {
11 	Symbol *sp;
12 
13 	for (sp = symlist; sp != (Symbol *) 0; sp = sp->next)
14 		if (strcmp(sp->name, s) == 0)
15 			return sp;
16 	return 0;	/* 0 ==> not found */
17 }
18 
19 Symbol*
20 install(char* s, int t, double d)  /* install s in symbol table */
21 {
22 	Symbol *sp;
23 
24 	sp = emalloc(sizeof(Symbol));
25 	sp->name = emalloc(strlen(s)+1); /* +1 for '\0' */
26 	strcpy(sp->name, s);
27 	sp->type = t;
28 	sp->u.val = d;
29 	sp->next = symlist; /* put at front of list */
30 	symlist = sp;
31 	return sp;
32 }
33 
34 void*
35 emalloc(unsigned n)	/* check return from malloc */
36 {
37 	char *p;
38 
39 	p = malloc(n);
40 	if (p == 0)
41 		execerror("out of memory", (char *) 0);
42 	return p;
43 }
44 
45 Formal*
46 formallist(Symbol *formal, Formal *list)	/* add formal to list */
47 {
48 	Formal *f;
49 
50 	f = emalloc(sizeof(Formal));
51 	f->sym = formal;
52 	f->save = 0;
53 	f->next = list;
54 	return f;
55 }