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cc65/libsrc/common/islower.s
cuz ca815af077 iscntrl was not mentioned in the Makefile and therefor not built.
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
2000-06-08 18:35:04 +00:00

22 lines
300 B
ArmAsm

;
; Ullrich von Bassewitz, 02.06.1998
;
; int islower (int c);
;
.export _islower
.import __ctype
_islower:
cpx #$00 ; Char range ok?
bne @L1 ; Jump if no
tay
lda __ctype,y ; Get character classification
and #$01 ; Mask lower char bit
rts
@L1: lda #$00 ; Return false
tax
rts