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authorJoseph Myers <joseph@codesourcery.com>2021-09-30 20:53:34 +0000
committerJoseph Myers <joseph@codesourcery.com>2021-09-30 20:53:34 +0000
commit01d34e934a395675ba3c576f2a51f10b86efbc20 (patch)
tree0c45b06458f2458671ade0c404d41527c63bfefd /libio
parent52c057e37c3e0d1451f1c1cc0465eddee6cf236d (diff)
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Add C2X _PRINTF_NAN_LEN_MAX
C2X adds a macro _PRINTF_NAN_LEN_MAX to <stdio.h>, giving the maximum length of printf output for a NaN. glibc never includes an n-char-sequence in its printf output for NaNs, so the correct value for glibc is 4 ("-nan" or "-NAN"); define the macro accordingly. This patch makes the macro definition conditional on __GLIBC_USE (ISOC2X), as is generally done with features from new standard versions. The name is in the implementation namespace for older standards, so it would also be possible to define it unconditionally. Tested for x86_64.
Diffstat (limited to 'libio')
-rw-r--r--libio/stdio.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/libio/stdio.h b/libio/stdio.h
index 497da01..0a5c76b 100644
--- a/libio/stdio.h
+++ b/libio/stdio.h
@@ -133,6 +133,12 @@ typedef __fpos64_t fpos64_t;
#include <bits/stdio_lim.h>
+#if __GLIBC_USE (ISOC2X)
+/* Maximum length of printf output for a NaN. */
+# define _PRINTF_NAN_LEN_MAX 4
+#endif
+
+
/* Standard streams. */
extern FILE *stdin; /* Standard input stream. */
extern FILE *stdout; /* Standard output stream. */