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| author | Joseph Myers <joseph@codesourcery.com> | 2023-06-19 19:40:34 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2023-06-19 19:40:34 +0000 |
| commit | 2d88df541132f09454d947c498103aa7be76b652 (patch) | |
| tree | 93e7cc592019cda92c8edb9a30ac4f1c2757386c /stdlib | |
| parent | 5f83b2674e42cd74257731b281f66d0442bf045f (diff) | |
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C2x scanf %b support
ISO C2x defines scanf %b for input of binary integers (with an
optional 0b or 0B prefix). Implement such support, along with the
corresponding SCNb* macros in <inttypes.h>. Unlike the support for
binary integers with 0b or 0B prefix with scanf %i, this is supported
in all versions of scanf (independent of the standards mode used for
compilation), because there are no backwards compatibility concerns
(%b wasn't previously a supported format) the way there were for %i.
Tested for x86_64 and x86.
Diffstat (limited to 'stdlib')
| -rw-r--r-- | stdlib/inttypes.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/stdlib/inttypes.h b/stdlib/inttypes.h index 8f0fa8ab9f..42ecf681cc 100644 --- a/stdlib/inttypes.h +++ b/stdlib/inttypes.h @@ -302,6 +302,28 @@ typedef wchar_t __gwchar_t; # define SCNxPTR __PRIPTR_PREFIX "x" +/* Binary notation. */ +# if __GLIBC_USE (ISOC2X) +# define SCNb8 "hhb" +# define SCNb16 "hb" +# define SCNb32 "b" +# define SCNb64 __PRI64_PREFIX "b" + +# define SCNbLEAST8 "hhb" +# define SCNbLEAST16 "hb" +# define SCNbLEAST32 "b" +# define SCNbLEAST64 __PRI64_PREFIX "b" + +# define SCNbFAST8 "hhb" +# define SCNbFAST16 __PRIPTR_PREFIX "b" +# define SCNbFAST32 __PRIPTR_PREFIX "b" +# define SCNbFAST64 __PRI64_PREFIX "b" + +# define SCNbMAX __PRI64_PREFIX "b" +# define SCNbPTR __PRIPTR_PREFIX "b" +# endif + + __BEGIN_DECLS #if __WORDSIZE == 64 |