From c8d4c99ecd84efb9f47d2af7ce52d5996d17d4a4 Mon Sep 17 00:00:00 2001 From: Masamichi Hosoda Date: Wed, 15 Aug 2018 08:39:22 +0900 Subject: [PATCH] Fix strtof ("-nan") returns positive NaN strtof ("-nan") returned positive NaN instead of negative NaN. strtod ("-nan") and strtold ("-nan") return negative NaN. Linux glibc has been fixed that strto{f|d|ld} ("-nan") returns negative NaN. https://sourceware.org/bugzilla/show_bug.cgi?id=23007 This commit makes strtof preserves the negative sign bit when parsing "-nan" like glibc. --- newlib/libc/stdlib/strtod.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/newlib/libc/stdlib/strtod.c b/newlib/libc/stdlib/strtod.c index 3164e307a..431d3ab07 100644 --- a/newlib/libc/stdlib/strtod.c +++ b/newlib/libc/stdlib/strtod.c @@ -1289,7 +1289,7 @@ strtof_l (const char *__restrict s00, char **__restrict se, locale_t loc) { double val = _strtod_l (_REENT, s00, se, loc); if (isnan (val)) - return nanf (NULL); + return signbit (val) ? -nanf (NULL) : nanf (NULL); float retval = (float) val; #ifndef NO_ERRNO if (isinf (retval) && !isinf (val)) @@ -1304,7 +1304,7 @@ strtof (const char *__restrict s00, { double val = _strtod_l (_REENT, s00, se, __get_current_locale ()); if (isnan (val)) - return nanf (NULL); + return signbit (val) ? -nanf (NULL) : nanf (NULL); float retval = (float) val; #ifndef NO_ERRNO if (isinf (retval) && !isinf (val))