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bstr: fix possible undefined behavior with length 0 strings 

BSTR_P() passes the string length and start pointer to printf-like
functions. If the lenfth is 0, the pointer can be NULL, but we're
actually still not allowed to pass a NULL pointer in any case.

This is mostly a technically, because nobody in their right mind would
attempt to specifically break such cases. But it's still undefined
behavior, and some libcs might be strict about this.
This commit is contained in:
wm4 2015-01-12 14:43:52 +01:00
parent 8144d142e4
commit 4a7c6aaedf
1 changed files with 1 additions and 1 deletions
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misc/bstr.h
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@ -207,7 +207,7 @@ static inline int bstr_eatstart0(struct bstr *s, const char *prefix)
}
// create a pair (not single value!) for "%.*s" printf syntax
#define BSTR_P(bstr) (int)((bstr).len), (bstr).start
#define BSTR_P(bstr) (int)((bstr).len), ((bstr).start ? (char*)(bstr).start : "")
#define WHITESPACE " \f\n\r\t\v"