Use C implementation of strncmp.

Add a new strncmp testcase.

libc/string/arm/strncmp.S

@@ -1,101 +0,0 @@
-/*
- * Copyright (c) 2002 ARM Ltd
- * 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. The name of the company may not be used to endorse or promote
- *    products derived from this software without specific prior written
- *    permission.
- *
- * THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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.
- *
- * Adapted for uClibc from NetBSD strncmp.S, version 1.2 2003/04/05
- * by Erik Andersen <andersen@codepoet.org>
- */
-
-#include <features.h>
-#include <bits/arm_asm.h>
-
-.text
-.global strncmp
-.type strncmp,%function
-.align 4
-
-#if defined(THUMB1_ONLY)
-.thumb_func
-strncmp:
-	/* if (len == 0) return 0 */
-	cmp	r2, #0
-	bne	1f
-	mov	r0, #0
-	bx	lr
-1:
-	push	{r4}
-
-	/* ip == last src address to compare */
-	add	r4, r0, r2
-2:
-	cmp	r4, r0
-	beq	3f
-	ldrb	r2, [r0]
-	add	r0, r0, #1
-	ldrb	r3, [r1]
-	add	r1, r1, #1
-	cmp	r2, #0
-	beq	3f
-	cmp	r2, r3
-	beq	2b
-3:
-	sub	r0, r2, r3
-	pop	{r4}
-	bx	lr
-#else
-strncmp:
-	/* if (len == 0) return 0 */
-	cmp	r2, #0
-	IT(tt, eq)
-	moveq	r0, #0
-#if defined(__USE_BX__)
-        bxeq    lr
-#else
-	moveq	pc, lr
-#endif
-	subs	r2, r2, #1
-
-	/* ip == last src address to compare */
-	add	ip, r0, r2
-1:
-	ldrb	r2, [r0], #1
-	ldrb	r3, [r1], #1
-	cmp	ip, r0
-	IT(tt, cs)
-	cmpcs	r2, #1
-	cmpcs	r2, r3
-	beq	1b
-	sub	r0, r2, r3
-#if defined(__USE_BX__)
-        bx      lr
-#else
-  	mov	pc, lr
-#endif
-#endif
-
-.size strncmp,.-strncmp
-
-libc_hidden_weak(strncmp)

test/string/tester.c

@@ -427,6 +427,7 @@ test_strncmp (void)
   check (strncmp ("abc", "def", 0) == 0, 13);	/* Zero count. */
   check (strncmp ("abc", "", (size_t)-1) > 0, 14);	/* set sign bit in count */
   check (strncmp ("abc", "abc", (size_t)-2) == 0, 15);
+  check (strncmp ("aa", "ab", (size_t)-1) < 0, 16);
 }
 
 static void