Clean up <stdlib.h> slightly.

Interestingly, this mostly involves cleaning up our implementation of
various <string.h> functions.

Change-Id: Ifaef49b5cb997134f7bc0cc31bdac844bdb9e089

3 files changed, 140 insertions, 17 deletions

diff --git a/libc/upstream-openbsd/lib/libc/string/memcpy.c b/libc/upstream-openbsd/lib/libc/string/memcpy.c
new file mode 100644
index 0000000..1b9715e
--- /dev/null
+++ b/libc/upstream-openbsd/lib/libc/string/memcpy.c
@@ -0,0 +1,99 @@
+/*	$OpenBSD: memcpy.c,v 1.1 2014/11/30 19:43:56 deraadt Exp $ */
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * 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. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <syslog.h>
+
+/*
+ * sizeof(word) MUST BE A POWER OF TWO
+ * SO THAT wmask BELOW IS ALL ONES
+ */
+typedef	long word;		/* "word" used for optimal copy speed */
+
+#define	wsize	sizeof(word)
+#define	wmask	(wsize - 1)
+
+/*
+ * Copy a block of memory, not handling overlap.
+ */
+void *
+memcpy(void *dst0, const void *src0, size_t length)
+{
+	char *dst = dst0;
+	const char *src = src0;
+	size_t t;
+
+	if (length == 0 || dst == src)		/* nothing to do */
+		goto done;
+
+	if ((dst < src && dst + length > src) ||
+	    (src < dst && src + length > dst)) {
+		struct syslog_data sdata = SYSLOG_DATA_INIT;
+
+		syslog_r(LOG_CRIT, &sdata, "backwards memcpy");
+		abort();
+	}
+
+	/*
+	 * Macros: loop-t-times; and loop-t-times, t>0
+	 */
+#define	TLOOP(s) if (t) TLOOP1(s)
+#define	TLOOP1(s) do { s; } while (--t)
+
+	/*
+	 * Copy forward.
+	 */
+	t = (long)src;	/* only need low bits */
+	if ((t | (long)dst) & wmask) {
+		/*
+		 * Try to align operands.  This cannot be done
+		 * unless the low bits match.
+		 */
+		if ((t ^ (long)dst) & wmask || length < wsize)
+			t = length;
+		else
+			t = wsize - (t & wmask);
+		length -= t;
+		TLOOP1(*dst++ = *src++);
+	}
+	/*
+	 * Copy whole words, then mop up any trailing bytes.
+	 */
+	t = length / wsize;
+	TLOOP(*(word *)dst = *(word *)src; src += wsize; dst += wsize);
+	t = length & wmask;
+	TLOOP(*dst++ = *src++);
+done:
+	return (dst0);
+}
diff --git a/libc/upstream-openbsd/lib/libc/string/bcopy.c b/libc/upstream-openbsd/lib/libc/string/memmove.c
index 4308c64..1baad53 100644
--- a/libc/upstream-openbsd/lib/libc/string/bcopy.c
+++ b/libc/upstream-openbsd/lib/libc/string/memmove.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bcopy.c,v 1.5 2005/08/08 08:05:37 espie Exp $ */
+/*	$OpenBSD: memmove.c,v 1.1 2014/11/30 19:43:56 deraadt Exp $ */
 /*-
  * Copyright (c) 1990 The Regents of the University of California.
  * All rights reserved.
@@ -44,21 +44,9 @@ typedef	long word;		/* "word" used for optimal copy speed */
 
 /*
  * Copy a block of memory, handling overlap.
- * This is the routine that actually implements
- * (the portable versions of) bcopy, memcpy, and memmove.
  */
-#ifdef MEMCOPY
-void *
-memcpy(void *dst0, const void *src0, size_t length)
-#else
-#ifdef MEMMOVE
 void *
 memmove(void *dst0, const void *src0, size_t length)
-#else
-void
-bcopy(const void *src0, void *dst0, size_t length)
-#endif
-#endif
 {
 	char *dst = dst0;
 	const char *src = src0;
@@ -120,9 +108,5 @@ bcopy(const void *src0, void *dst0, size_t length)
 		TLOOP(*--dst = *--src);
 	}
 done:
-#if defined(MEMCOPY) || defined(MEMMOVE)
 	return (dst0);
-#else
-	return;
-#endif
 }
diff --git a/libc/upstream-openbsd/lib/libc/string/wmemcpy.c b/libc/upstream-openbsd/lib/libc/string/wmemcpy.c
new file mode 100644
index 0000000..9bbd836
--- /dev/null
+++ b/libc/upstream-openbsd/lib/libc/string/wmemcpy.c
@@ -0,0 +1,40 @@
+/*	$OpenBSD: wmemcpy.c,v 1.3 2005/08/08 08:05:37 espie Exp $	*/
+/*	$NetBSD: wmemcpy.c,v 1.2 2001/01/03 14:29:37 lukem Exp $	*/
+
+/*-
+ * Copyright (c)1999 Citrus Project,
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ *	citrus Id: wmemcpy.c,v 1.2 2000/12/20 14:08:31 itojun Exp
+ */
+
+#include <string.h>
+#include <wchar.h>
+
+wchar_t *
+wmemcpy(wchar_t *d, const wchar_t *s, size_t n)
+{
+
+	return (wchar_t *)memcpy(d, s, n * sizeof(wchar_t));
+}