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Don't call the driver if we don't have one loaded

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git-svn-id: svn://svn.cc65.org/cc65/trunk@1431 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz 2002-10-03 13:54:42 +00:00
parent 8b14f60e0d
commit 5fec8ac5c3
1 changed files with 6 additions and 3 deletions
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9
libsrc/tgi/tgi_geterror.s
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@ -11,11 +11,14 @@
.export _tgi_geterror
_tgi_geterror:
lda _tgi_drv ; Check if we have a driver
ora _tgi_drv+1
beq @L1
jsr tgi_geterror ; First call driver
ldx #$00 ; Clear high byte
@L1: ldx #$00 ; Clear high byte
ldy _tgi_error ; Test high level error code
beq @L1 ; Branch if no high level error code
beq @L2 ; Branch if no high level error code
tya ; Use high level code if we have one
stx _tgi_error ; Clear high level error code
@L1: rts
@L2: rts