2020-01-02 17:57:03 +00:00
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; isupper.s
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2000-05-28 13:40:48 +00:00
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;
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2020-01-02 17:57:03 +00:00
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; This file is part of
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; cc65 - a freeware C compiler for 6502 based systems
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;
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2020-02-02 17:21:25 +00:00
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; https://cc65.github.io
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2020-01-02 17:57:03 +00:00
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;
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; See "LICENSE" file for legal information.
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2000-05-28 13:40:48 +00:00
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;
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; int isupper (int c);
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;
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2013-05-09 11:56:54 +00:00
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.export _isupper
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.include "ctype.inc"
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2020-04-02 20:58:16 +00:00
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.import ctypemask
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2000-05-28 13:40:48 +00:00
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_isupper:
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2020-04-02 20:58:16 +00:00
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jsr ctypemask ; (always clears X)
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bcs @L1 ; out of range? (everything already clear -> false)
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and #CT_UPPER ; mask upper char bit
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2020-01-02 17:57:03 +00:00
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@L1: rts
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