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OUPCASE.ASM
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Assembly Source File
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1989-05-02
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1KB
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44 lines
; FILENAME: OUPCASE.ASM
; Copyright (c) 1988,1989 by Borland International, Inc.
;
; Description: This module implements the routine UpCase. The
; routine converts a letter to upper-case.
; This module uses MASM mode syntax and standard segment directives.
;
; ASSEMBLY INSTRUCTIONS: To assemble this module use the following
; TASM command line.
;
; TASM oupcase
include globals.inc
_TEXT segment
UpCase proc
; This function returns the corresponding upper-case letter for
; the lower-case letter passed in al.
;
; Input
; al - contains the ASCII value for an lower-case letter
; Output
; al - contains the ASCII value for the corresponding upper-case
; letter
; Registers modified
; al
; Convert the letter in AL to upper-case.
cmp al, 'a'
jb upcas1
cmp al, 'z'
ja upcas1
sub al, 'a'-'A'
upcas1:
ret
UpCase endp
_TEXT ends
end