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79 lines
1.9 KiB
NASM
79 lines
1.9 KiB
NASM
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page ,132
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title strset - set all characters of string to character
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;***
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;strset.asm - sets all charcaters of string to given character
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;
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; Copyright (c) Microsoft Corporation. All rights reserved.
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;
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;Purpose:
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; defines _strset() - sets all of the characters in a string (except
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; the '\0') equal to a given character.
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;
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;*******************************************************************************
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.xlist
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include cruntime.inc
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.list
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page
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;***
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;char *_strset(string, val) - sets all of string to val
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;
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;Purpose:
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; Sets all of characters in string (except the terminating '/0'
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; character) equal to val.
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;
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; Algorithm:
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; char *
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; _strset (string, val)
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; char *string;
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; char val;
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; {
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; char *start = string;
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;
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; while (*string)
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; *string++ = val;
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; return(start);
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; }
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;
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;Entry:
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; char *string - string to modify
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; char val - value to fill string with
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;
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;Exit:
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; returns string -- now filled with val's
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;
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;Uses:
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;
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;Exceptions:
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;
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;*******************************************************************************
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CODESEG
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public _strset
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_strset proc \
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uses edi, \
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string:ptr byte, \
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val:byte
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mov edi,[string] ; di = string
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mov edx,edi ; dx=string addr; save return value
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xor eax,eax ; ax = 0
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or ecx,-1 ; cx = -1
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repne scasb ; scan string & count bytes
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add ecx,2 ; cx=-strlen
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neg ecx ; cx=strlen
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mov al,[val] ; al = byte value to store
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mov edi,edx ; di=string addr
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rep stosb
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mov eax,edx ; return value: string addr
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ret ; _cdecl return
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_strset endp
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end
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