blob: 35799a5524ca261e809e78d7935ac578a25ce9a7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
#include "symtab.h"
#include <stdlib.h>
#include <string.h>
unsigned int hash(char *s)
{
uint32_t hv = 0;
for ( int i = 0; s[i] != '\0'; i++ ) {
// take MSB 6 bits of hv and xors with LSB of s[i]
uint32_t v = ( hv >> 26 ) ^ (s[i] & 0x3f);
// Push those back on hv
hv = (hv << 4) | v;
}
// Return appropriate size
return hv % HASHSIZE;
}
symnode_t *sym_insert(char *var)
{
unsigned int index = hash(var);
// Save old value
symnode_t *oldSym = symbolarray[index];
// Make new
symbolarray[index] = malloc(sizeof(symnode_t));
if ( symbolarray[index] == NULL ) {
// If malloc failed
symbolarray[index] = oldSym;
return NULL;
}
// Link old one
symbolarray[index]->next = oldSym;
symbolarray[index]->name = var;
return symbolarray[index];
}
symnode_t *sym_lookup(char *var)
{
unsigned int index = hash(var);
symnode_t *n = symbolarray[index];
// Look trough list
while (n != NULL && strcmp(n->name, var) != 0) {
n = n->next;
}
return n;
}
|
