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util: string: Add helper to check whether string is empty
The helper checks whether a string contains only whitespace or is NULL.
This will be helpful to skip cases where a user string is optional, but
may be provided empty with the same meaning.
(cherry picked from commit 0eeafeedeb
)
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@ -1991,6 +1991,7 @@ virStrdup;
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virStringArrayHasString;
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virStringFreeList;
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virStringFreeListCount;
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virStringIsEmpty;
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virStringJoin;
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virStringListLength;
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virStringReplace;
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@ -633,6 +633,22 @@ virSkipSpacesBackwards(const char *str, char **endp)
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*endp = NULL;
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}
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/**
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* virStringIsEmpty:
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* @str: string to check
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*
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* Returns true if string is empty (may contain only whitespace) or NULL.
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*/
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bool
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virStringIsEmpty(const char *str)
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{
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if (!str)
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return true;
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virSkipSpaces(&str);
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return str[0] == '\0';
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}
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char *
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virArgvToString(const char *const *argv)
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{
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@ -107,6 +107,8 @@ void virTrimSpaces(char *str, char **endp) ATTRIBUTE_NONNULL(1);
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void virSkipSpacesBackwards(const char *str, char **endp)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
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bool virStringIsEmpty(const char *str);
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char *virStrncpy(char *dest, const char *src, size_t n, size_t destbytes)
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ATTRIBUTE_RETURN_CHECK;
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char *virStrcpy(char *dest, const char *src, size_t destbytes)
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