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https://github.com/autc04/Retro68.git
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49 lines
1.3 KiB
ArmAsm
49 lines
1.3 KiB
ArmAsm
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/*
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* (c) Copyright 1986 HEWLETT-PACKARD COMPANY
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*
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* To anyone who acknowledges that this file is provided "AS IS"
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* without any express or implied warranty:
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* permission to use, copy, modify, and distribute this file
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* for any purpose is hereby granted without fee, provided that
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* the above copyright notice and this notice appears in all
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* copies, and that the name of Hewlett-Packard Company not be
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* used in advertising or publicity pertaining to distribution
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* of the software without specific, written prior permission.
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* Hewlett-Packard Company makes no representations about the
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* suitability of this software for any purpose.
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*/
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/* SPECTRUM_ID: @(#)memchr.s 37.4 86/04/23 */
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/*
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* memchr(s, c, n)
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*
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* returns pointer to first occurrence of char c
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* in first n characters of memory area s,
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* or null if c does not occur.
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*/
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#include "DEFS.h"
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#define FROM arg0
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#define CHAR arg1
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#define COUNT arg2
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#define TEMP1 r19
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ENTRY(memchr)
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comb,<= COUNT,r0,memchrexit /* return if count is zero */
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copy r0,ret0 /* null if c not found in n chars */
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depi 0,23,24,CHAR /* make char unsigned */
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ldbs,ma 1(FROM),TEMP1
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memchrloop:
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comb,=,n TEMP1,CHAR,memchrequal
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addib,<> -1,COUNT,memchrloop
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ldbs,ma 1(FROM),TEMP1
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b,n memchrexit
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memchrequal:
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ldo -1(FROM),ret0
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memchrexit:
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EXIT(memchr)
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