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Learned the hard way that even meant-to-be-simple sample programs should contain some error checking.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@5546 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
ol.sc 2012-02-22 23:29:52 +00:00
parent 336e53348b
commit c3e5aa643b
1 changed files with 32 additions and 8 deletions
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40
samples/geos/overlay-demo.c
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@ -65,18 +65,27 @@ void foobar (void)
void main(int /*argc*/, char *argv[]) void main(int /*argc*/, char *argv[])
{ {
OpenRecordFile(argv[0]); if (OpenRecordFile(argv[0])) {
_poserror("OpenRecordFile");
return;
}
DlgBoxOk(CBOLDON "Overlay Demo - Main" CPLAINTEXT, DlgBoxOk(CBOLDON "Overlay Demo - Main" CPLAINTEXT,
"Click OK to call Overlay One."); "Click OK to call Overlay One.");
PointRecord(1); if (PointRecord(1)) {
_poserror("PointRecord.1");
return;
}
/* The macro definitions OVERLAY_ADDR and OVERLAY_SIZE were generated in /* The macro definitions OVERLAY_ADDR and OVERLAY_SIZE were generated in
* overlay-demores.h by grc65. They contain the overlay area address and * overlay-demores.h by grc65. They contain the overlay area address and
* size specific to a certain program. * size specific to a certain program.
*/ */
ReadRecord(OVERLAY_ADDR, OVERLAY_SIZE); if (ReadRecord(OVERLAY_ADDR, OVERLAY_SIZE)) {
_poserror("ReadRecord.1");
return;
}
/* The linker makes sure that the call to foo() ends up at the right mem /* The linker makes sure that the call to foo() ends up at the right mem
* addr. However it's up to user to make sure that the - right - overlay * addr. However it's up to user to make sure that the - right - overlay
@ -87,23 +96,38 @@ void main(int /*argc*/, char *argv[])
DlgBoxOk(CBOLDON "Overlay Demo - Main" CPLAINTEXT, DlgBoxOk(CBOLDON "Overlay Demo - Main" CPLAINTEXT,
"Click OK to call Overlay Two."); "Click OK to call Overlay Two.");
PointRecord(2); if (PointRecord(2)) {
_poserror("PointRecord.2");
return;
}
/* Replacing one overlay with another one can only happen from the main /* Replacing one overlay with another one can only happen from the main
* program. This implies that an overlay can never load another overlay. * program. This implies that an overlay can never load another overlay.
*/ */
ReadRecord(OVERLAY_ADDR, OVERLAY_SIZE); if (ReadRecord(OVERLAY_ADDR, OVERLAY_SIZE)) {
_poserror("ReadRecord.2");
return;
}
bar(); bar();
DlgBoxOk(CBOLDON "Overlay Demo - Main" CPLAINTEXT, DlgBoxOk(CBOLDON "Overlay Demo - Main" CPLAINTEXT,
"Click OK to call Overlay Three."); "Click OK to call Overlay Three.");
PointRecord(3); if (PointRecord(3)) {
_poserror("PointRecord.3");
return;
}
ReadRecord(OVERLAY_ADDR, OVERLAY_SIZE); if (ReadRecord(OVERLAY_ADDR, OVERLAY_SIZE)) {
_poserror("ReadRecord.3");
return;
}
foobar(); foobar();
CloseRecordFile(); if (CloseRecordFile()) {
_poserror("CloseRecordFile");
return;
}
} }