strcpy_naive.S revision 1.2.8.2
1 1.2.8.2 tls /*- 2 1.2.8.2 tls * Copyright (c) 2013 The NetBSD Foundation, Inc. 3 1.2.8.2 tls * All rights reserved. 4 1.2.8.2 tls * 5 1.2.8.2 tls * This code is derived from software contributed to The NetBSD Foundation 6 1.2.8.2 tls * by Matt Thomas of 3am Software Foundry. 7 1.2.8.2 tls * 8 1.2.8.2 tls * Redistribution and use in source and binary forms, with or without 9 1.2.8.2 tls * modification, are permitted provided that the following conditions 10 1.2.8.2 tls * are met: 11 1.2.8.2 tls * 1. Redistributions of source code must retain the above copyright 12 1.2.8.2 tls * notice, this list of conditions and the following disclaimer. 13 1.2.8.2 tls * 2. Redistributions in binary form must reproduce the above copyright 14 1.2.8.2 tls * notice, this list of conditions and the following disclaimer in the 15 1.2.8.2 tls * documentation and/or other materials provided with the distribution. 16 1.2.8.2 tls * 17 1.2.8.2 tls * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 18 1.2.8.2 tls * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 1.2.8.2 tls * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 1.2.8.2 tls * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 21 1.2.8.2 tls * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 1.2.8.2 tls * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 1.2.8.2 tls * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 1.2.8.2 tls * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 1.2.8.2 tls * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 1.2.8.2 tls * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 1.2.8.2 tls * POSSIBILITY OF SUCH DAMAGE. 28 1.2.8.2 tls */ 29 1.2.8.2 tls #include <machine/asm.h> 30 1.2.8.2 tls 31 1.2.8.2 tls RCSID("$NetBSD: strcpy_naive.S,v 1.2.8.2 2013/02/25 00:23:58 tls Exp $") 32 1.2.8.2 tls 33 1.2.8.2 tls #ifdef _LIBC 34 1.2.8.2 tls #ifdef STRLCPY 35 1.2.8.2 tls WEAK_ALIAS(strlcpy, _strlcpy) 36 1.2.8.2 tls #endif 37 1.2.8.2 tls #include "namespace.h" 38 1.2.8.2 tls #endif 39 1.2.8.2 tls 40 1.2.8.2 tls /* 41 1.2.8.2 tls * These are "naive" versions of the str*cpy routines designed to be simple 42 1.2.8.2 tls * and small. 43 1.2.8.2 tls */ 44 1.2.8.2 tls 45 1.2.8.2 tls #if defined(STRLCPY) 46 1.2.8.2 tls /* LINTSTUB: size_t strlcpy(char *, const char *, size_t) */ 47 1.2.8.2 tls ENTRY(strlcpy) 48 1.2.8.2 tls add ip, r1, #1 /* save src pointer (+ NUL) */ 49 1.2.8.2 tls subs r2, r2, #1 /* make sure there's room for a NUL */ 50 1.2.8.2 tls blt 3f /* no room, do the strlen */ 51 1.2.8.2 tls add r2, r2, r0 /* get end of dst */ 52 1.2.8.2 tls 1: cmp r0, r2 /* room for another char? */ 53 1.2.8.2 tls beq 2f /* no, write NUL and do the strlen */ 54 1.2.8.2 tls ldrb r3, [r1], #1 /* read a byte */ 55 1.2.8.2 tls strb r3, [r0], #1 /* write a byte */ 56 1.2.8.2 tls teq r3, #0 /* was it a NUL? */ 57 1.2.8.2 tls bne 1b /* no, do next byte */ 58 1.2.8.2 tls b 4f /* yes, end of string, so return */ 59 1.2.8.2 tls 2: mov r3, #0 /* NUL */ 60 1.2.8.2 tls strb r3, [r0], #1 /* write to end of string */ 61 1.2.8.2 tls 3: ldrb r3, [r1], #1 /* read a byte */ 62 1.2.8.2 tls teq r3, #0 /* was it a NUL? */ 63 1.2.8.2 tls bne 3b /* no, get next byte */ 64 1.2.8.2 tls 4: sub r0, r1, ip /* return length of src string */ 65 1.2.8.2 tls RET 66 1.2.8.2 tls END(strlcpy) 67 1.2.8.2 tls #elif defined(STRNCPY) 68 1.2.8.2 tls /* LINTSTUB: char * strncpy(char *, const char *, size_t) */ 69 1.2.8.2 tls ENTRY(strncpy) 70 1.2.8.2 tls mov ip, r0 /* we want to preserve r0 */ 71 1.2.8.2 tls add r2, r2, r0 /* get end of dst buffer */ 72 1.2.8.2 tls 1: cmp ip, r2 /* are at the end of dst already? */ 73 1.2.8.2 tls RETc(eq) /* yes, just return. */ 74 1.2.8.2 tls ldrb r3, [r1], #1 /* read a byte */ 75 1.2.8.2 tls strb r3, [ip], #1 /* write a byte */ 76 1.2.8.2 tls teq r3, #0 /* was it a NUL? */ 77 1.2.8.2 tls bne 1b /* no, try next byte */ 78 1.2.8.2 tls 2: cmp ip, r2 /* are at the end of dst already? */ 79 1.2.8.2 tls strltb r3, [ip], #1 /* no, write a NUL */ 80 1.2.8.2 tls blt 2b /* until dst is filled */ 81 1.2.8.2 tls 3: RET /* return dst pointer */ 82 1.2.8.2 tls END(strncpy) 83 1.2.8.2 tls #else 84 1.2.8.2 tls /* LINTSTUB: char * strcpy(char *, const char *) */ 85 1.2.8.2 tls ENTRY(strcpy) 86 1.2.8.2 tls mov ip, r0 /* we want to preserve r0 */ 87 1.2.8.2 tls 1: ldrb r3, [r1], #1 /* read a byte */ 88 1.2.8.2 tls strb r3, [ip], #1 /* write a byte */ 89 1.2.8.2 tls teq r3, #0 /* was it a NUL? */ 90 1.2.8.2 tls bne 1b /* no, try next byte */ 91 1.2.8.2 tls RET /* return dst pointer */ 92 1.2.8.2 tls END(strcpy) 93 1.2.8.2 tls #endif 94
Indexes created Fri Sep 26 20:09:58 GMT 2025