diff options
| -rw-r--r-- | libio/iofwide.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/libio/iofwide.c b/libio/iofwide.c index 231cc56c34..2e2854aa62 100644 --- a/libio/iofwide.c +++ b/libio/iofwide.c @@ -36,6 +36,7 @@ # include <locale/localeinfo.h> # include <wcsmbs/wcsmbsload.h> # include <iconv/gconv_int.h> +# include <shlib-compat.h> #endif @@ -96,9 +97,20 @@ _IO_fwide (fp, mode) /* Normalize the value. */ mode = mode < 0 ? -1 : (mode == 0 ? 0 : 1); - if (mode == 0 || fp->_mode != 0) - /* The caller simply wants to know about the current orientation - or the orientation already has been determined. */ + if (mode == 0) + /* The caller simply wants to know about the current orientation. */ + return fp->_mode; + +#if defined SHARED && defined _LIBC \ + && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) + if (__builtin_expect (&_IO_stdin_used == NULL, 0) + && (fp == _IO_stdin || fp == _IO_stdout || fp == _IO_stderr)) + /* This is for a stream in the glibc 2.0 format. */ + return -1; +#endif + + if (fp->_mode != 0) + /* The orientation already has been determined. */ return fp->_mode; /* Set the orientation appropriately. */ |