xref: /illumos-gate/usr/src/common/util/memstr.c (revision 82333da9)
17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * CDDL HEADER START
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
57fad02eeSpetede  * Common Development and Distribution License (the "License").
67fad02eeSpetede  * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate  *
87c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate  * and limitations under the License.
127c478bd9Sstevel@tonic-gate  *
137c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate  *
197c478bd9Sstevel@tonic-gate  * CDDL HEADER END
207c478bd9Sstevel@tonic-gate  */
217c478bd9Sstevel@tonic-gate /*
22*82333da9SSurya Prakki  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
237c478bd9Sstevel@tonic-gate  */
257c478bd9Sstevel@tonic-gate #if defined(_BOOT)
267c478bd9Sstevel@tonic-gate #include <sys/salib.h>
277c478bd9Sstevel@tonic-gate #else
287c478bd9Sstevel@tonic-gate #include <sys/systm.h>
297c478bd9Sstevel@tonic-gate #endif
317c478bd9Sstevel@tonic-gate /*
327c478bd9Sstevel@tonic-gate  * Implementations of functions described in memory(3C).
337c478bd9Sstevel@tonic-gate  * These functions match the section 3C manpages.
347c478bd9Sstevel@tonic-gate  */
35*82333da9SSurya Prakki /*
36*82333da9SSurya Prakki  * The SunStudio compiler may generate calls to _memmove, _memset,
37*82333da9SSurya Prakki  * and _memcpy; So we need to make sure that the correct symbols
38*82333da9SSurya Prakki  * exist for these calls.
39*82333da9SSurya Prakki  */
40*82333da9SSurya Prakki #pragma weak _memmove = memmove
417c478bd9Sstevel@tonic-gate void *
memmove(void * s1,const void * s2,size_t n)427c478bd9Sstevel@tonic-gate memmove(void *s1, const void *s2, size_t n)
437c478bd9Sstevel@tonic-gate {
447c478bd9Sstevel@tonic-gate #if defined(_BOOT)
457c478bd9Sstevel@tonic-gate 	bcopy(s2, s1, n);
467c478bd9Sstevel@tonic-gate #else
477c478bd9Sstevel@tonic-gate 	ovbcopy(s2, s1, n);
487c478bd9Sstevel@tonic-gate #endif
497c478bd9Sstevel@tonic-gate 	return (s1);
507c478bd9Sstevel@tonic-gate }
52*82333da9SSurya Prakki #pragma weak _memset = memset
537c478bd9Sstevel@tonic-gate void *
memset(void * s,int c,size_t n)547c478bd9Sstevel@tonic-gate memset(void *s, int c, size_t n)
557c478bd9Sstevel@tonic-gate {
567c478bd9Sstevel@tonic-gate 	unsigned char *t;
587c478bd9Sstevel@tonic-gate 	if ((unsigned char)c == '\0')
597c478bd9Sstevel@tonic-gate 		bzero(s, n);
607c478bd9Sstevel@tonic-gate 	else {
617c478bd9Sstevel@tonic-gate 		for (t = (unsigned char *)s; n > 0; n--)
627c478bd9Sstevel@tonic-gate 			*t++ = (unsigned char)c;
637c478bd9Sstevel@tonic-gate 	}
647c478bd9Sstevel@tonic-gate 	return (s);
657c478bd9Sstevel@tonic-gate }
677c478bd9Sstevel@tonic-gate int
memcmp(const void * s1,const void * s2,size_t n)687c478bd9Sstevel@tonic-gate memcmp(const void *s1, const void *s2, size_t n)
697c478bd9Sstevel@tonic-gate {
707c478bd9Sstevel@tonic-gate 	const uchar_t *ps1 = s1;
717c478bd9Sstevel@tonic-gate 	const uchar_t *ps2 = s2;
737c478bd9Sstevel@tonic-gate 	if (s1 != s2 && n != 0) {
747c478bd9Sstevel@tonic-gate 		do {
757c478bd9Sstevel@tonic-gate 			if (*ps1++ != *ps2++)
767c478bd9Sstevel@tonic-gate 				return (ps1[-1] - ps2[-1]);
777c478bd9Sstevel@tonic-gate 		} while (--n != 0);
787c478bd9Sstevel@tonic-gate 	}
807c478bd9Sstevel@tonic-gate 	return (0);
817c478bd9Sstevel@tonic-gate }
837fad02eeSpetede #pragma weak _memcpy = memcpy
847c478bd9Sstevel@tonic-gate void *
memcpy(void * s1,const void * s2,size_t n)857c478bd9Sstevel@tonic-gate memcpy(void *s1, const void *s2, size_t n)
867c478bd9Sstevel@tonic-gate {
877c478bd9Sstevel@tonic-gate 	bcopy(s2, s1, n);
887c478bd9Sstevel@tonic-gate 	return (s1);
897c478bd9Sstevel@tonic-gate }
917c478bd9Sstevel@tonic-gate void *
memchr(const void * sptr,int c1,size_t n)927c478bd9Sstevel@tonic-gate memchr(const void *sptr, int c1, size_t n)
937c478bd9Sstevel@tonic-gate {
947c478bd9Sstevel@tonic-gate 	if (n != 0) {
957c478bd9Sstevel@tonic-gate 		unsigned char c = (unsigned char)c1;
967c478bd9Sstevel@tonic-gate 		const unsigned char *sp = sptr;
987c478bd9Sstevel@tonic-gate 		do {
997c478bd9Sstevel@tonic-gate 			if (*sp++ == c)
1007c478bd9Sstevel@tonic-gate 				return ((void *)--sp);
1017c478bd9Sstevel@tonic-gate 		} while (--n != 0);
1027c478bd9Sstevel@tonic-gate 	}
1037c478bd9Sstevel@tonic-gate 	return (NULL);
1047c478bd9Sstevel@tonic-gate }