diff options
Diffstat (limited to 'newlib/libc/stdio/getwchar.c')
| -rw-r--r-- | newlib/libc/stdio/getwchar.c | 41 |
1 files changed, 37 insertions, 4 deletions
diff --git a/newlib/libc/stdio/getwchar.c b/newlib/libc/stdio/getwchar.c index f559c76..7ab230a 100644 --- a/newlib/libc/stdio/getwchar.c +++ b/newlib/libc/stdio/getwchar.c @@ -26,34 +26,65 @@ /* FUNCTION -<<getwchar>>---read a wide character from standard input +<<getwchar>>, <<getwchar_unlocked>>---read a wide character from standard input INDEX getwchar INDEX + getwchar_unlocked +INDEX _getwchar_r +INDEX + _getwchar_unlocked_r ANSI_SYNOPSIS #include <wchar.h> wint_t getwchar(void); + #define _GNU_SOURCE + #include <wchar.h> + wint_t getwchar_unlocked(void); + + #include <wchar.h> wint_t _getwchar_r(struct _reent *<[reent]>); + #include <wchar.h> + wint_t _getwchar_unlocked_r(struct _reent *<[reent]>); + TRAD_SYNOPSIS #include <wchar.h> wint_t getwchar(); + #define _GNU_SOURCE + #include <wchar.h> + wint_t getwchar_unlocked(); + + #include <wchar.h> wint_t _getwchar_r(<[reent]>) char * <[reent]>; + #include <wchar.h> + wint_t _getwchar_unlocked_r(<[reent]>) + char * <[reent]>; + DESCRIPTION <<getwchar>> function or macro is the wide character equivalent of the <<getchar>> function. You can use <<getwchar>> to get the next wide character from the standard input stream. As a side effect, <<getwchar>> advances the standard input's current position indicator. -The alternate function <<_getwchar_r>> is a reentrant version. The -extra argument <[reent]> is a pointer to a reentrancy structure. +<<getwchar_unlocked>> is a non-thread-safe version of <<getwchar>>. +<<getwchar_unlocked>> may only safely be used within a scope +protected by flockfile() (or ftrylockfile()) and funlockfile(). This +function may safely be used in a multi-threaded program if and only +if they are called while the invoking thread owns the (FILE *) +object, as is the case after a successful call to the flockfile() or +ftrylockfile() functions. If threads are disabled, then +<<getwchar_unlocked>> is equivalent to <<getwchar>>. + +The alternate functions <<_getwchar_r>> and <<_getwchar_unlocked_r>> are +reentrant versions of the above. The extra argument <[reent]> is a pointer to +a reentrancy structure. RETURNS The next wide character cast to <<wint_t>>, unless there is no more @@ -64,7 +95,9 @@ You can distinguish the two situations that cause an <<WEOF>> result by using `<<ferror(stdin)>>' and `<<feof(stdin)>>'. PORTABILITY -C99 +<<getwchar>> is required by C99. + +<<getwchar_unlocked>> is a GNU extension. */ #include <_ansi.h> |