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use some fancy compiler magic (thanks to Matthew Woehlke on the gcc-help mailing list) to restore type-safety to S_OR by going back to a macro, but preserve the side-effect-safe usage of the macro arguments

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@155967 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin P. Fleming
2008-11-11 17:57:20 +00:00
parent 7afa3746c3
commit 2872f82397
1 changed files with 2 additions and 8 deletions
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10
include/asterisk/strings.h
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@@ -52,19 +52,13 @@ static force_inline int ast_strlen_zero(const char *s)
/*! \brief returns the equivalent of logic or for strings: /*! \brief returns the equivalent of logic or for strings:
* first one if not empty, otherwise second one. * first one if not empty, otherwise second one.
*/ */
static force_inline char *S_OR(const char *a, const char *b) #define S_OR(a, b) ({typeof(&((a)[0])) __x = (a); ast_strlen_zero(__x) ? (b) : __x;})
{
return ast_strlen_zero(a) ? (char *) b : (char *) a;
}
/*! \brief returns the equivalent of logic or for strings, with an additional boolean check: /*! \brief returns the equivalent of logic or for strings, with an additional boolean check:
* second one if not empty and first one is true, otherwise third one. * second one if not empty and first one is true, otherwise third one.
* example: S_COR(usewidget, widget, "<no widget>") * example: S_COR(usewidget, widget, "<no widget>")
*/ */
static force_inline char *S_COR(unsigned char a, const char *b, const char *c) #define S_COR(a, b, c) ({typeof(&((b)[0])) __x = (b); (a) && !ast_strlen_zero(__x) ? (__x) : (c);})
{
return a && !ast_strlen_zero(b) ? (char *) b : (char *) c;
}
/*! /*!
\brief Gets a pointer to the first non-whitespace character in a string. \brief Gets a pointer to the first non-whitespace character in a string.