NetBSD/lib/libc/arch/i386/string/index.S

/*
 * Written by J.T. Conklin <jtc@netbsd.org>.
 * Public domain.
 */

#include <machine/asm.h>

#if defined(LIBC_SCCS)
	RCSID("$NetBSD: index.S,v 1.8 1995/04/28 22:58:01 jtc Exp $")
#endif

#ifdef STRCHR
ENTRY(strchr)
#else
ENTRY(index)
#endif
	pushl	%ebx
	movl	8(%esp),%eax
	movb	12(%esp),%cl
	.align 2,0x90
L1:
	movb	(%eax),%bl
	cmpb	%bl,%cl			/* found char??? */
	je 	L2
	incl	%eax
	testb	%bl,%bl			/* null terminator??? */
	jnz	L1
	xorl	%eax,%eax
L2:
	popl	%ebx
	ret
make an arch directory in libc, and move all machine dirs into it 1993-10-07 03:17:24 +03:00			`/*`
Winning Strategies has placed this code into the Public Domain 1995-04-29 02:53:59 +04:00			`* Written by J.T. Conklin <jtc@netbsd.org>.`
			`* Public domain.`
make an arch directory in libc, and move all machine dirs into it 1993-10-07 03:17:24 +03:00			`*/`

Use RCSID macro for RCS ID's. 1994-03-12 04:39:55 +03:00			`#include <machine/asm.h>`

Change instances of LIBC_RCS back to LIBC_SCCS. If we are going to change th LIBC_RCS, the entire source tree should be updated at once. Remove && !defined(lint) from conditionals around rcs id's. No one is ever going to pass a *.s file through lint. 1993-10-21 04:39:55 +03:00			`#if defined(LIBC_SCCS)`
$Id: $ -> $NetBSD: $ 1995-04-29 02:57:54 +04:00			`RCSID("$NetBSD: index.S,v 1.8 1995/04/28 22:58:01 jtc Exp $")`
Change instances of LIBC_RCS back to LIBC_SCCS. If we are going to change th LIBC_RCS, the entire source tree should be updated at once. Remove && !defined(lint) from conditionals around rcs id's. No one is ever going to pass a *.s file through lint. 1993-10-21 04:39:55 +03:00			`#endif`
make an arch directory in libc, and move all machine dirs into it 1993-10-07 03:17:24 +03:00
No reason these can't share code... 1993-12-09 01:10:14 +03:00			`#ifdef STRCHR`
			`ENTRY(strchr)`
			`#else`
make an arch directory in libc, and move all machine dirs into it 1993-10-07 03:17:24 +03:00			`ENTRY(index)`
No reason these can't share code... 1993-12-09 01:10:14 +03:00			`#endif`
make an arch directory in libc, and move all machine dirs into it 1993-10-07 03:17:24 +03:00			`pushl %ebx`
			`movl 8(%esp),%eax`
			`movb 12(%esp),%cl`
			`.align 2,0x90`
			`L1:`
			`movb (%eax),%bl`
			`cmpb %bl,%cl /* found char??? */`
			`je L2`
			`incl %eax`
			`testb %bl,%bl /* null terminator??? */`
Style police. Use `je' and `jne' only on the result of an equality test; use `jz' and `jnz' in all other cases. 1994-02-14 23:05:52 +03:00			`jnz L1`
make an arch directory in libc, and move all machine dirs into it 1993-10-07 03:17:24 +03:00			`xorl %eax,%eax`
			`L2:`
			`popl %ebx`
			`ret`