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- 8.3 overlay filenames - exit only after keypress git-svn-id: svn://svn.cc65.org/cc65/trunk@5740 b7a2c559-68d2-44c3-8de9-860c34a00d81
90 lines
1.5 KiB
C
90 lines
1.5 KiB
C
/*
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* Minimalistic overlay demo program.
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*
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* 2009-10-02, Oliver Schmidt (ol.sc@web.de)
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*
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*/
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#include <stdio.h>
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#include <conio.h>
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#include <fcntl.h>
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#include <unistd.h>
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extern void _OVERLAY1_LOAD__, _OVERLAY1_SIZE__;
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extern void _OVERLAY2_LOAD__, _OVERLAY2_SIZE__;
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extern void _OVERLAY3_LOAD__, _OVERLAY3_SIZE__;
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void log (char *msg)
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{
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printf ("Log: %s\n", msg);
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}
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#pragma code-name (push, "OVERLAY1");
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void foo (void)
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{
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log ("Calling main from overlay 1");
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}
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#pragma code-name (pop);
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#pragma code-name (push, "OVERLAY2");
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void bar (void)
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{
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log ("Calling main from overlay 2");
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}
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#pragma code-name (pop);
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#pragma code-name (push, "OVERLAY3");
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void foobar (void)
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{
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log ("Calling main from overlay 3");
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}
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#pragma code-name(pop);
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unsigned char loadfile (char *name, void *addr, void *size)
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{
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int file = open (name, O_RDONLY);
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if (file == -1) {
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log ("Opening overlay file failed");
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return 0;
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}
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read (file, addr, (unsigned) size);
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close (file);
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return 1;
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}
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void main (void)
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{
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log ("Calling overlay 1 from main");
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if (loadfile ("ovrldemo.1", &_OVERLAY1_LOAD__, &_OVERLAY1_SIZE__)) {
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foo ();
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}
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log ("Calling overlay 2 from main");
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if (loadfile ("ovrldemo.2", &_OVERLAY2_LOAD__, &_OVERLAY2_SIZE__)) {
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bar ();
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}
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log ("Calling overlay 3 from main");
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if (loadfile ("ovrldemo.3", &_OVERLAY3_LOAD__, &_OVERLAY3_SIZE__)) {
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foobar ();
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}
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cgetc ();
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}
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