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More reliable way to determine if disk image has a .po file extension
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@ -65,16 +65,10 @@ int dsk2woz( const char * filename ) {
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fclose(dsk_file);
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// Determine from the filename whether to use Pro-DOS sector order.
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bool has_p = false;
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bool has_dot = false;
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const char *extension = filename + strlen(filename);
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do {
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has_p = *extension == 'p';
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has_dot = *extension == '.';
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--extension;
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} while(extension > filename && *extension != '/' && *extension != '.');
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const bool is_prodos = has_p && has_dot;
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const char *extension = filename + strlen(filename) - 3;
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// for some reason macos does not have stricmp, so we do it in a not-so-efficient way
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const bool is_prodos = (strcmp(extension, ".po") == 0) || (strcmp(extension, ".PO") == 0);
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// If the DSK image was too short, announce failure. Some DSK files
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// seem empirically to be too long, but it's unclear that the extra
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// bytes actually mean anything — they're usually not many.
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