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bd38edc817
Do not require that isinf, printf, etc. treat noncanonical values as NaNs. Instead, require only that they do not crash. Problem reported by Joseph Myers in: https://sourceware.org/ml/libc-alpha/2015-02/msg00244.html * doc/posix-functions/dprintf.texi (dprintf): * doc/posix-functions/fprintf.texi (fprintf): * doc/posix-functions/isfinite.texi (isfinite): * doc/posix-functions/isinf.texi (isinf): * doc/posix-functions/isnan.texi (isnan): * doc/posix-functions/printf.texi (printf): * doc/posix-functions/snprintf.texi (snprintf): * doc/posix-functions/sprintf.texi (sprintf): * doc/posix-functions/vdprintf.texi (vdprintf): * doc/posix-functions/vfprintf.texi (vfprintf): * doc/posix-functions/vprintf.texi (vprintf): * doc/posix-functions/vsnprintf.texi (vsnprintf): * doc/posix-functions/vsprintf.texi (vsprintf): Document this. * m4/isfinite.m4 (gl_ISFINITEL_WORKS): * m4/isinf.m4 (gl_ISINFL_WORKS): * m4/isnanl.m4 (gl_FUNC_ISNANL_WORKS): * m4/printf.m4 (gl_PRINTF_INFINITE_LONG_DOUBLE): * tests/test-isfinite.c (test_isfinitel): * tests/test-isinf.c (test_isinfl): * tests/test-isnan.c (test_long_double): * tests/test-isnanl.h (main): * tests/test-snprintf-posix.h (test_function): * tests/test-sprintf-posix.h (test_function): * tests/test-vasnprintf-posix.c (test_function): * tests/test-vasprintf-posix.c (test_function): o Test only that noncanonical values do not cause crashes, not that they are treated as NaNs. In some cases this means a larger output buffer is needed.
58 lines
1.8 KiB
Plaintext
58 lines
1.8 KiB
Plaintext
@node vdprintf
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@section @code{vdprintf}
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@findex vdprintf
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/vdprintf.html}
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Gnulib module: vdprintf or vdprintf-posix
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Portability problems fixed by either Gnulib module @code{vdprintf} or @code{vdprintf-posix}:
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@itemize
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@item
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This function is missing on some platforms:
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Mac OS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, Minix 3.1.8, AIX 5.1, HP-UX 11,
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IRIX 6.5, OSF/1 5.1, Solaris 11 2011-11, Cygwin 1.5.x, mingw, MSVC 9, Interix 3.5.
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@end itemize
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Portability problems fixed by Gnulib module @code{vdprintf-posix}:
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@itemize
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@item
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This function does not support size specifiers as in C99 (@code{hh}, @code{ll},
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@code{j}, @code{t}, @code{z}) on some platforms:
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BeOS.
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@item
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printf of @samp{long double} numbers is unsupported on some platforms:
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BeOS.
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@item
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This function does not support the @samp{a} and @samp{A} directives on some
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platforms:
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glibc-2.3.6, BeOS.
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@item
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This function does not support the @samp{F} directive on some platforms:
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BeOS.
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@item
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This function does not support format directives that access arguments in an
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arbitrary order, such as @code{"%2$s"}, on some platforms:
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BeOS.
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@item
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This function does not support precisions larger than 512 or 1024 in integer,
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floating-point and pointer output on some platforms:
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AIX 7.1, BeOS.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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Formatting noncanonical @samp{long double} numbers produces
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nonmeaningful results on some platforms:
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glibc and others, on x86, x86_64, IA-64 CPUs.
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@item
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When formatting an integer with grouping flag, this function inserts thousands
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separators even in the "C" locale on some platforms:
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NetBSD 5.1.
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@item
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On some platforms, this function does not set @code{errno} or the
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stream error indicator on attempts to write to a read-only stream:
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Cygwin 1.7.9.
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@end itemize
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