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This commit is contained in:
matt 2013-08-19 02:13:13 +00:00
parent 414db3a8ba
commit 8ba242506b
1 changed files with 16 additions and 1 deletions
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17
common/lib/libc/arch/arm/string/strlen_naive.S
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@ -28,16 +28,26 @@
*/
#include <machine/asm.h>
RCSID("$NetBSD: strlen_naive.S,v 1.6 2013/08/19 02:11:03 matt Exp $")
RCSID("$NetBSD: strlen_naive.S,v 1.7 2013/08/19 02:13:13 matt Exp $")
#ifdef STRNLEN
/* LINTSTUB: size_t strnlen(const char *, size_t) */
ENTRY(strnlen)
adds r3, r0, #1 /* start of src + NUL */
#ifdef __thumb__
adds r2, r0, r1 /* &src[maxlen] */
mov ip, r2
#else
adds ip, r0, r1 /* &src[maxlen] */
#endif
1: cmp r0, ip /* is this of string? */
beq 2f /* yes it is */
#ifdef __thumb__
ldrb r2, [r0] /* read a byte */
adds r0, r0, #1 /* advance to next byte */
#else
ldrb r2, [r0], #1 /* read a byte */
#endif
cmp r2, #0 /* is it a NUL? */
bne 1b /* no, get next byte */
subs r0, r0, r3 /* get difference between start and end */
@ -50,7 +60,12 @@ END(strnlen)
ENTRY(strlen)
adds r2, r0, #1 /* start of src + NUL */
1:
#ifdef __thumb__
ldrb r3, [r0] /* read a byte */
adds r0, r0, #1
#else
ldrb r3, [r0], #1 /* read a byte */
#endif
cmp r3, #0 /* is it a NUL? */
bne 1b /* no, get next byte */
subs r0, r0, r2 /* return difference between start and end */