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If len == 0, then the result must be 0 regardless of the other arguments.

This commit is contained in:
mycroft 1994-11-24 16:36:35 +00:00
parent 9e809275c9
commit fcc40a849d
1 changed files with 4 additions and 3 deletions
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7
lib/libc/arch/i386/string/memchr.S
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@ -27,13 +27,13 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: memchr.S,v 1.5 1994/03/12 01:40:01 jtc Exp $
* $Id: memchr.S,v 1.6 1994/11/24 16:36:35 mycroft Exp $
*/
#include <machine/asm.h>
#if defined(LIBC_SCCS)
RCSID("$Id: memchr.S,v 1.5 1994/03/12 01:40:01 jtc Exp $")
RCSID("$Id: memchr.S,v 1.6 1994/11/24 16:36:35 mycroft Exp $")
#endif
/*
@ -49,7 +49,8 @@ ENTRY(memchr)
movl 8(%esp),%edi /* string address */
movl 12(%esp),%eax /* set character to search for */
movl 16(%esp),%ecx /* set length of search */
testl %eax,%eax /* clear Z flag, for len == 0 */
testl %ecx,%ecx /* test for len == 0 */
jz L1
cld /* set search forward */
repne /* search! */
scasb