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[libc] Ensure that error numbers from EUNIQ() have the correct type

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Error numbers are signed ints.  EUNIQ() should not allow implicit type
promotion based on the supplied error diambiguator, because this
causes problems with statements such as

  rc = ( condition ? -EUNIQ ( EBASE, disambiguator ) : -EBASE );

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2010-09-22 19:59:37 +01:00
parent a5a4dcd0c7
commit 2a92697bda
1 changed files with 1 additions and 1 deletions
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2
src/include/errno.h
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@ -201,7 +201,7 @@ extern char missing_errfile_declaration[] __attribute__ (( deprecated ));
*/
#define EUNIQ( errno, uniq, ... ) ( { \
euniq_discard ( 0, ##__VA_ARGS__); \
( (errno) | ( (uniq) << 8 ) ); } )
( ( int ) ( (errno) | ( (uniq) << 8 ) ) ); } )
static inline void euniq_discard ( int dummy __unused, ... ) {}
/**