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tests: utils: Allow NULL strings to be equal to empty file in virTestCompareToFile
Treat an NULL string equivalent to an empty string in virTestCompareToFile so that callers don't need to add additional logic in case when a test produces no output.
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@ -777,6 +777,8 @@ int virTestDifferenceBin(FILE *stream,
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/*
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* @param strcontent: String input content
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* @param filename: File to compare strcontent against
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*
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* If @strcontent is NULL, it's treated as an empty string.
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*/
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int
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virTestCompareToFile(const char *strcontent,
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@ -787,6 +789,9 @@ virTestCompareToFile(const char *strcontent,
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char *fixedcontent = NULL;
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const char *cmpcontent = strcontent;
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if (!cmpcontent)
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cmpcontent = "";
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if (virTestLoadFile(filename, &filecontent) < 0 && !virTestGetRegenerate())
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goto failure;
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