initial import

1 files changed, 113 insertions, 0 deletions

diff --git a/sysdeps/vax/strstr.s b/sysdeps/vax/strstr.s
new file mode 100644
index 0000000..2e53375
--- /dev/null
+++ b/sysdeps/vax/strstr.s
@@ -0,0 +1,113 @@
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * 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 the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+	.asciz "@(#)strstr.s	5.2 (Berkeley) 8/21/90"
+#endif /* LIBC_SCCS and not lint */
+
+/*
+ * Find the first occurrence of s2 as a substring in s1.
+ * If s2 is empty, return s1.
+ *
+ * char *strstr(s1, s2)
+ *	const char *s1, *s2;
+ */
+#include "DEFS.h"
+
+ENTRY(strstr, 0)
+	movq	4(ap),r3	/* r3 = s1, r4 = s2 */
+	movzwl	$65535,r2	/* r2 = locc/matchc limit */
+	locc	$0,r2,(r4)	/* find '\0' in s2 */
+	beql	4f
+	subl3	r4,r1,r5	/* r5 = strlen(s2) */
+	beql	1f		/* if r5 == 0, return s1 */
+
+	/*
+	 * s2 is short enough to apply matchc.
+	 * If s1 is long, we have to do it in stages.
+	 */
+0:	locc	$0,r2,(r3)	/* find '\0' in s1 */
+	beql	3f
+
+	/*
+	 * Both strings are `short'; we can use matchc directly.
+	 */
+	subl3	r3,r1,r1	/* r1 = strlen(s1) */
+	matchc	r5,(r4),r1,(r3)	/* find substring */
+	bneq	2f
+
+	/*
+	 * r3 points r5 bytes past match.  Return the match.
+	 */
+1:	subl3	r5,r3,r0	/* return (byte_past_match - strlen(s2)) */
+	ret
+
+	/*
+	 * There is no matching substring.
+	 */
+2:	clrl	r0		/* return NULL */
+	ret
+
+	/*
+	 * s1 is too long (> 65535 bytes) to apply matchc directly,
+	 * but s2 is short enough.  Apply s2 to s1, then (if not
+	 * found yet) advancing s1 by (65536-strlen(s2)) bytes and
+	 * loop.
+	 */
+3:	matchc	r5,(r4),r2,(r3)	/* search */
+	beql	1b		/* if found, go return it */
+	decw	r2		/* from 0 to 65535 */
+	incl	r3		/* already advanced 65535, now 65536 */
+	subl2	r5,r3		/* ... minus strlen(s2) */
+	brb	0b
+
+	/*
+	 * s2 is too long (> 65535 bytes) to bother with matchc.
+	 */
+4:	locc	$0,r2,(r1)	/* continue working on strlen(s2) */
+	beql	4b
+	subl3	r1,r4,r5	/* r5 = strlen(s2) */
+	movb	(r4)+,r2	/* r2 = *s2++ */
+	decl	r5		/* fix up length */
+5:	movb	(r3)+,r0	/* r0 = *s1++ */
+	beql	2b		/* if '\0', return NULL */
+	cmpb	r0,r2
+	bneq	5b		/* loop until first char found */
+	pushr	R5|R4|R3|R2	/* save c, s1, s2, n */
+	pushr	R5|R4|R3	/* strncmp(s1, s2, n) */
+	calls	$3,_strncmp
+	popr	R2|R3|R4|R5	/* restore */
+	tstl	r0
+	bneq	5b		/* loop until strncmp says rest same too */
+	subl3	$1,r3,r0	/* return previous s1 */
+	ret