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strerror_r(ev, tmp, 0) may return tmp

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This commit is contained in:
Peter Dimov
2024-06-02 23:03:24 +03:00
parent d1fb7554c5
commit 38d63aaf7c
1 changed files with 11 additions and 4 deletions
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15
include/boost/system/detail/generic_category_message.hpp
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@ -39,12 +39,19 @@ inline char const * strerror_r_helper( int r, char const * buffer ) noexcept
inline char const * generic_error_category_message( int ev, char * buffer, std::size_t len ) noexcept
{
if ( buffer != nullptr )
if( buffer != nullptr )
{
return strerror_r_helper( strerror_r( ev, buffer, len ), buffer );
}
else
{
// strerror_r requires non-null buffer pointer
// strerror_r requires non-null buffer pointer
char dummy_buffer[ 1 ];
return strerror_r_helper( strerror_r( ev, dummy_buffer, 0 ), buffer );
char tmp[ 1 ];
char const* r = strerror_r_helper( strerror_r( ev, tmp, 0 ), buffer );
return r == tmp? nullptr: r;
}
}
inline std::string generic_error_category_message( int ev )