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ca815af077
Change the isxxx functions to correctly handle values outside of character range. git-svn-id: svn://svn.cc65.org/cc65/trunk@33 b7a2c559-68d2-44c3-8de9-860c34a00d81
22 lines
310 B
ArmAsm
22 lines
310 B
ArmAsm
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; Ullrich von Bassewitz, 02.06.1998
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; int isupper (int c);
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;
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.export _isupper
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.import __ctype
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_isupper:
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cpx #$00 ; Char range ok?
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bne @L1 ; Jump if no
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tay
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lda __ctype,y ; Get character classification
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and #$02 ; Mask upper char bit
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rts
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@L1: lda #$00 ; Return false
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tax
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rts
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