Source code of Windows XP (NT5)
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page ,132 title strset - set all characters of string to character;***;strset.asm - sets all charcaters of string to given character;; Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.;;Purpose:; defines _strset() - sets all of the characters in a string (except; the '\0') equal to a given character.;;Revision History:; 11-18-83 RN initial version; 05-18-88 SJM Add model-independent (large model) ifdef; 08-04-88 SJM convert to cruntime/ add 32-bit support; 08-23-88 JCR 386 cleanup; 10-26-88 JCR General cleanup for 386-only code; 03-26-90 GJF Changed to _stdcall. Also, fixed the copyright.; 01-18-91 GJF ANSI naming.; 05-10-91 GJF Back to _cdecl, sigh...;;*******************************************************************************
.xlist include cruntime.inc .list
page;***;char *_strset(string, val) - sets all of string to val;;Purpose:; Sets all of characters in string (except the terminating '/0'; character) equal to val.;; Algorithm:; char *; _strset (string, val); char *string;; char val;; {; char *start = string;;; while (*string); *string++ = val;; return(start);; };;Entry:; char *string - string to modify; char val - value to fill string with;;Exit:; returns string -- now filled with val's;;Uses:;;Exceptions:;;*******************************************************************************
CODESEG
public _strset_strset proc \ uses edi, \ string:ptr byte, \ val:byte
mov edi,[string] ; di = string mov edx,edi ; dx=string addr; save return value
xor eax,eax ; ax = 0 or ecx,-1 ; cx = -1repne scasb ; scan string & count bytes inc ecx inc ecx ; cx=-strlen neg ecx ; cx=strlen mov al,[val] ; al = byte value to store mov edi,edx ; di=string addrrep stosb
mov eax,edx ; return value: string addr
ifdef _STDCALL_ ret DPSIZE + ISIZE ; _stdcall returnelse ret ; _cdecl returnendif
_strset endp end
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