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* [gcc r13-7706] libstdc++: Fix std::format for localized floats [PR110968]
@ 2023-08-11 0:03 Jonathan Wakely
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From: Jonathan Wakely @ 2023-08-11 0:03 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:15b3fc6c1c5296662d0ffd7d3cfb8b669421e5ea
commit r13-7706-g15b3fc6c1c5296662d0ffd7d3cfb8b669421e5ea
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Thu Aug 10 14:33:44 2023 +0100
libstdc++: Fix std::format for localized floats [PR110968]
The __formatter_fp::_M_localize function just returns an empty string if
the formatting locale is the C locale, as there is nothing to do. But
the caller was assuming that the returned string contains the localized
string. The caller should use the original string if _M_localize returns
an empty string.
libstdc++-v3/ChangeLog:
PR libstdc++/110968
* include/std/format (__formatter_fp::format): Check return
value of _M_localize.
* testsuite/std/format/functions/format.cc: Check classic
locale.
(cherry picked from commit f48a5423964f72e2e1ba0ad6a14d9d1464a78bed)
Diff:
---
libstdc++-v3/include/std/format | 5 +++--
libstdc++-v3/testsuite/std/format/functions/format.cc | 3 +++
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/libstdc++-v3/include/std/format b/libstdc++-v3/include/std/format
index 96bf17e2aa17..8d6df7452fd7 100644
--- a/libstdc++-v3/include/std/format
+++ b/libstdc++-v3/include/std/format
@@ -1608,8 +1608,8 @@ namespace __format
_Optional_locale __loc;
- basic_string_view<_CharT> __str;
basic_string<_CharT> __wstr;
+ basic_string_view<_CharT> __str;
if constexpr (is_same_v<_CharT, char>)
__str = __narrow_str;
else
@@ -1632,7 +1632,8 @@ namespace __format
__wstr = _M_localize(__str, __expc, __fc.locale());
else
__wstr = _M_localize(__str, __expc, __loc.value());
- __str = __wstr;
+ if (!__wstr.empty())
+ __str = __wstr;
}
size_t __width = _M_spec._M_get_width(__fc);
diff --git a/libstdc++-v3/testsuite/std/format/functions/format.cc b/libstdc++-v3/testsuite/std/format/functions/format.cc
index 3485535e3cba..ba9403be79e3 100644
--- a/libstdc++-v3/testsuite/std/format/functions/format.cc
+++ b/libstdc++-v3/testsuite/std/format/functions/format.cc
@@ -193,6 +193,9 @@ test_locale()
s = std::format(eloc, "{0:#Lg} {0:+#.3Lg} {0:#08.4Lg}", -1234.);
VERIFY( s == "-1.234,00 -1,23e+03 -01.234," );
+ s = std::format(cloc, "{:05L}", -1.0); // PR libstdc++/110968
+ VERIFY( s == "-0001" );
+
// Restore
std::locale::global(cloc);
}
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