1 files changed, 117 insertions, 0 deletions
diff --git a/contrib/byacc/symtab.c b/contrib/byacc/symtab.c
new file mode 100644
index 0000000..9839180
--- /dev/null
+++ b/contrib/byacc/symtab.c
@@ -0,0 +1,117 @@
+/* $Id: symtab.c,v 1.10 2012/05/26 15:16:12 tom Exp $ */
+
+#include "defs.h"
+
+/* TABLE_SIZE is the number of entries in the symbol table. */
+/* TABLE_SIZE must be a power of two.			    */
+
+#define	TABLE_SIZE 1024
+
+static bucket **symbol_table = 0;
+bucket *first_symbol;
+bucket *last_symbol;
+
+static int
+hash(const char *name)
+{
+    const char *s;
+    int c, k;
+
+    assert(name && *name);
+    s = name;
+    k = *s;
+    while ((c = *++s) != 0)
+	k = (31 * k + c) & (TABLE_SIZE - 1);
+
+    return (k);
+}
+
+bucket *
+make_bucket(const char *name)
+{
+    bucket *bp;
+
+    assert(name != 0);
+
+    bp = TMALLOC(bucket, 1);
+    NO_SPACE(bp);
+
+    bp->link = 0;
+    bp->next = 0;
+
+    bp->name = TMALLOC(char, strlen(name) + 1);
+    NO_SPACE(bp->name);
+
+    bp->tag = 0;
+    bp->value = UNDEFINED;
+    bp->index = 0;
+    bp->prec = 0;
+    bp->class = UNKNOWN;
+    bp->assoc = TOKEN;
+    strcpy(bp->name, name);
+
+    return (bp);
+}
+
+bucket *
+lookup(const char *name)
+{
+    bucket *bp, **bpp;
+
+    bpp = symbol_table + hash(name);
+    bp = *bpp;
+
+    while (bp)
+    {
+	if (strcmp(name, bp->name) == 0)
+	    return (bp);
+	bpp = &bp->link;
+	bp = *bpp;
+    }
+
+    *bpp = bp = make_bucket(name);
+    last_symbol->next = bp;
+    last_symbol = bp;
+
+    return (bp);
+}
+
+void
+create_symbol_table(void)
+{
+    int i;
+    bucket *bp;
+
+    symbol_table = TMALLOC(bucket *, TABLE_SIZE);
+    NO_SPACE(symbol_table);
+
+    for (i = 0; i < TABLE_SIZE; i++)
+	symbol_table[i] = 0;
+
+    bp = make_bucket("error");
+    bp->index = 1;
+    bp->class = TERM;
+
+    first_symbol = bp;
+    last_symbol = bp;
+    symbol_table[hash("error")] = bp;
+}
+
+void
+free_symbol_table(void)
+{
+    FREE(symbol_table);
+    symbol_table = 0;
+}
+
+void
+free_symbols(void)
+{
+    bucket *p, *q;
+
+    for (p = first_symbol; p; p = q)
+    {
+	q = p->next;
+	FREE(p);
+    }
+}