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