initial import of NetBSD tree

1 files changed, 123 insertions, 0 deletions

diff --git a/usr.bin/xlint/lint2/hash.c b/usr.bin/xlint/lint2/hash.c
new file mode 100644
index 00000000000..79018025c95
--- /dev/null
+++ b/usr.bin/xlint/lint2/hash.c
@@ -0,0 +1,123 @@
+/*	$NetBSD: hash.c,v 1.2 1995/07/03 21:24:47 cgd Exp $	*/
+
+/*
+ * Copyright (c) 1994, 1995 Jochen Pohl
+ * All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Jochen Pohl for
+ *	The NetBSD Project.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char rcsid[] = "$NetBSD: hash.c,v 1.2 1995/07/03 21:24:47 cgd Exp $";
+#endif
+
+#include <stddef.h>
+#include <string.h>
+#include <limits.h>
+
+#include "lint2.h"
+
+/* pointer to hash table, initialized in inithash() */
+static	hte_t	**htab;
+
+static	int	hash __P((const char *));
+
+/*
+ * Initialize hash table.
+ */
+void
+inithash()
+{
+	htab = xcalloc(HSHSIZ2, sizeof (hte_t *));
+}
+
+/*
+ * Compute hash value from a string.
+ */
+static int
+hash(s)
+	const	char *s;
+{
+	u_int	v;
+	const	u_char *us;
+
+	v = 0;
+	for (us = (const u_char *)s; *us != '\0'; us++) {
+		v = (v << sizeof (v)) + *us;
+		v ^= v >> (sizeof (v) * CHAR_BIT - sizeof (v));
+	}
+	return (v % HSHSIZ2);
+}
+
+/*
+ * Look for a hash table entry. If no hash table entry for the
+ * given name exists and mknew is set, create a new one.
+ */
+hte_t *
+hsearch(s, mknew)
+	const	char *s;
+	int	mknew;
+{
+	int	h;
+	hte_t	*hte;
+
+	h = hash(s);
+	for (hte = htab[h]; hte != NULL; hte = hte->h_link) {
+		if (strcmp(hte->h_name, s) == 0)
+			break;
+	}
+
+	if (hte != NULL || !mknew)
+		return (hte);
+
+	/* create a new hte */
+	hte = xalloc(sizeof (hte_t));
+	hte->h_name = xstrdup(s);
+	hte->h_lsym = &hte->h_syms;
+	hte->h_lcall = &hte->h_calls;
+	hte->h_lusym = &hte->h_usyms;
+	hte->h_link = htab[h];
+	htab[h] = hte;
+
+	return (hte);
+}
+
+/*
+ * Call function f for each name in the hash table.
+ */
+void
+forall(f)
+	void	(*f) __P((hte_t *));
+{
+	int	i;
+	hte_t	*hte;
+
+	for (i = 0; i < HSHSIZ2; i++) {
+		for (hte = htab[i]; hte != NULL; hte = hte->h_link)
+			(*f)(hte);
+	}
+}