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cc65/libsrc/common/isprint.s
cuz def6300556 Use constants for the bits in the _ctype array.
git-svn-id: svn://svn.cc65.org/cc65/trunk@865 b7a2c559-68d2-44c3-8de9-860c34a00d81
2001-09-08 14:00:41 +00:00

23 lines
369 B
ArmAsm

;
; Ullrich von Bassewitz, 02.06.1998
;
; int isprint (int c);
;
.export _isprint
.include "ctype.inc"
_isprint:
cpx #$00 ; Char range ok?
bne @L1 ; Jump if no
tay
lda __ctype,y ; Get character classification
eor #CT_CTRL ; NOT a control char
and #CT_CTRL ; Mask control char bit
rts
@L1: lda #$00 ; Return false
tax
rts