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Tech Arsenal 1
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strlibs.zip
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STREND.ASM
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Assembly Source File
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1993-01-04
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1KB
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49 lines
; Static Name Aliases
;
TITLE strend
; NAME strend.C
; strend(s) returns a character pointer to the NUL which ends s. That
; is, strend(s)-s == strlen(s). This is useful for adding things at
; the end of strings. It is redundant, because strchr(s,'\0') could
; be used instead, but this is clearer and faster.
.287
_TEXT SEGMENT BYTE PUBLIC 'CODE'
_TEXT ENDS
_DATA SEGMENT WORD PUBLIC 'DATA'
_DATA ENDS
CONST SEGMENT WORD PUBLIC 'CONST'
CONST ENDS
_BSS SEGMENT WORD PUBLIC 'BSS'
_BSS ENDS
DGROUP GROUP CONST, _BSS, _DATA
ASSUME CS: _TEXT, DS: DGROUP, SS: DGROUP, ES: DGROUP
EXTRN __chkstk:NEAR
_TEXT SEGMENT
PUBLIC _strend
_strend PROC NEAR
push bp
mov bp,sp
push di
; s = 4
; register di = s
mov di,[bp+4] ;s
xor al,al
xor cx,cx
dec cx
repne scasb
mov ax,di
dec ax
pop di
mov sp,bp
pop bp
ret
_strend ENDP
_TEXT ENDS
END