| 1 | /* |
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| 2 | * (c) Copyright 1986 HEWLETT-PACKARD COMPANY |
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| 3 | * |
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| 4 | * To anyone who acknowledges that this file is provided "AS IS" |
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| 5 | * without any express or implied warranty: |
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| 6 | * permission to use, copy, modify, and distribute this file |
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| 7 | * for any purpose is hereby granted without fee, provided that |
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| 8 | * the above copyright notice and this notice appears in all |
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| 9 | * copies, and that the name of Hewlett-Packard Company not be |
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| 10 | * used in advertising or publicity pertaining to distribution |
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| 11 | * of the software without specific, written prior permission. |
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| 12 | * Hewlett-Packard Company makes no representations about the |
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| 13 | * suitability of this software for any purpose. |
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| 14 | */ |
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| 15 | |
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| 16 | /* SPECTRUM_ID: @(#)memchr.s 37.4 86/04/23 */ |
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| 17 | /* |
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| 18 | * memchr(s, c, n) |
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| 19 | * |
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| 20 | * returns pointer to first occurrence of char c |
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| 21 | * in first n characters of memory area s, |
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| 22 | * or null if c does not occur. |
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| 23 | */ |
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| 24 | |
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| 25 | #include "DEFS.h" |
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| 26 | |
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| 27 | #define FROM arg0 |
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| 28 | #define CHAR arg1 |
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| 29 | #define COUNT arg2 |
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| 30 | #define TEMP1 r19 |
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| 31 | |
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| 32 | ENTRY(memchr) |
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| 33 | comb,<= COUNT,r0,memchrexit /* return if count is zero */ |
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| 34 | copy r0,ret0 /* null if c not found in n chars */ |
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| 35 | depi 0,23,24,CHAR /* make char unsigned */ |
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| 36 | |
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| 37 | ldbs,ma 1(FROM),TEMP1 |
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| 38 | memchrloop: |
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| 39 | comb,=,n TEMP1,CHAR,memchrequal |
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| 40 | addib,<> -1,COUNT,memchrloop |
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| 41 | ldbs,ma 1(FROM),TEMP1 |
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| 42 | b,n memchrexit |
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| 43 | |
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| 44 | memchrequal: |
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| 45 | ldo -1(FROM),ret0 |
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| 46 | |
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| 47 | memchrexit: |
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| 48 | EXIT(memchr) |
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