case-insensitive touchstone file ending
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@ -145,10 +145,9 @@ Touchstone Touchstone::fromFile(string filename)
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// extract number of ports from filename
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auto index_extension = filename.find_last_of('.');
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if(filename[index_extension + 1] != 's'
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|| filename[index_extension+2] < '1'
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|| filename[index_extension+2] > '9'
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|| filename[index_extension+3] != 'p') {
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if((filename[index_extension + 1] != 's' && filename[index_extension + 1] != 'S')
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|| filename[index_extension+2] < '1' || filename[index_extension+2] > '9'
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|| (filename[index_extension+3] != 'p' && filename[index_extension+3] != 'P')) {
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throw runtime_error("Invalid filename extension");
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}
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unsigned int ports = filename[index_extension + 2] - '0';
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