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| author | Bruno Haible <bruno@clisp.org> | 2023-03-25 19:36:31 +0100 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2023-03-25 19:49:21 +0100 |
| commit | eb8da36e0b3a667444707fb7d0182e54bb2130d0 (patch) | |
| tree | 2456cce91815d62e13640cffa4e786fecdfb87d4 /lib/stdio.in.h | |
| parent | fdae921011d0233db99799edbf4a858596265392 (diff) | |
| download | gnulib-eb8da36e0b3a667444707fb7d0182e54bb2130d0.tar.gz | |
stdio: ISO C 23: Define _PRINTF_NAN_LEN_MAX.
* lib/stdio.in.h (_PRINTF_NAN_LEN_MAX): New macro.
* m4/stdio_h.m4 (gl_STDIO_H): Invoke gl_MUSL_LIBC.
* modules/stdio (Files): Add m4/musl.m4.
* tests/test-stdio.c: Check that _PRINTF_NAN_LEN_MAX is defined.
Include nan.h, macros.h.
(main): Check the value of _PRINTF_NAN_LEN_MAX.
* modules/stdio-tests (Files): Add tests/nan.h, tests/macros.h,
m4/exponentd.m4.
(configure.ac): Invoke gl_DOUBLE_EXPONENT_LOCATION.
Diffstat (limited to 'lib/stdio.in.h')
| -rw-r--r-- | lib/stdio.in.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/lib/stdio.in.h b/lib/stdio.in.h index 098f841738..0ed3e7595c 100644 --- a/lib/stdio.in.h +++ b/lib/stdio.in.h @@ -204,6 +204,37 @@ # undef putc_unlocked #endif + +/* Maximum number of characters produced by printing a NaN value. */ +#ifndef _PRINTF_NAN_LEN_MAX +# if defined __FreeBSD__ || defined __DragonFly__ \ + || defined __NetBSD__ \ + || defined __OpenBSD__ \ + || (defined __APPLE__ && defined __MACH__) +/* On BSD systems, a NaN value prints as just "nan", without a sign. */ +# define _PRINTF_NAN_LEN_MAX 3 +# elif (__GLIBC__ >= 2) || MUSL_LIBC || defined __sun || defined __CYGWIN__ +/* glibc, musl libc, Solaris libc, and Cygwin produce "[-]nan". */ +# define _PRINTF_NAN_LEN_MAX 4 +# elif defined _AIX +/* AIX produces "[-]NaNQ". */ +# define _PRINTF_NAN_LEN_MAX 5 +# elif defined _WIN32 && !defined __CYGWIN__ +/* On native Windows, the output can be: + - with MSVC ucrt: "[-]nan" or "[-]nan(ind)" or "[-]nan(snan)", + - with mingw: "[-]1.#IND" or "[-]1.#QNAN". */ +# define _PRINTF_NAN_LEN_MAX 10 +# elif defined __sgi +/* On IRIX, the output typically is "[-]nan0xNNNNNNNN" with 8 hexadecimal + digits. */ +# define _PRINTF_NAN_LEN_MAX 14 +# else +/* We don't know, but 32 should be a safe maximum. */ +# define _PRINTF_NAN_LEN_MAX 32 +# endif +#endif + + #if @GNULIB_DPRINTF@ # if @REPLACE_DPRINTF@ # if !(defined __cplusplus && defined GNULIB_NAMESPACE) |