From 6db1a2cdd3b96731f2e092d55d8c2136eabc52d0 Mon Sep 17 00:00:00 2001
From: Julian T <julian@jtle.dk>
Date: Tue, 11 Feb 2020 12:24:56 +0100
Subject: Rename and cleanup

---
 sem3/osc/mm11/regn/symtab.c | 50 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 sem3/osc/mm11/regn/symtab.c

(limited to 'sem3/osc/mm11/regn/symtab.c')

diff --git a/sem3/osc/mm11/regn/symtab.c b/sem3/osc/mm11/regn/symtab.c
new file mode 100644
index 0000000..8103203
--- /dev/null
+++ b/sem3/osc/mm11/regn/symtab.c
@@ -0,0 +1,50 @@
+#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;
+}
-- 
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