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string: fix vsnprintf on macOS

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vsnprintf_l and vswprintf_l mutate va_list parameter on some versions of macOS (11.7 Big Sur).
This makes it impossible to call printf multiple times with a growing buffer.

Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2024-02-08 14:16:36 +01:00
parent b5e35922f1
commit 5b80f24830
1 changed files with 6 additions and 2 deletions
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8
include/stdex/string.hpp
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@ -2328,7 +2328,9 @@ namespace stdex
#pragma warning(suppress: 4996) #pragma warning(suppress: 4996)
return _vsnprintf_l(str, capacity, format, locale, arg); return _vsnprintf_l(str, capacity, format, locale, arg);
#else #else
return ::vsnprintf_l(str, capacity, locale, format, arg); va_list arg_mutable;
va_copy(arg_mutable, arg);
return ::vsnprintf_l(str, capacity, locale, format, arg_mutable);
#endif #endif
} }
@ -2338,7 +2340,9 @@ namespace stdex
#pragma warning(suppress: 4996) #pragma warning(suppress: 4996)
return _vsnwprintf_l(str, capacity, format, locale, arg); return _vsnwprintf_l(str, capacity, format, locale, arg);
#else #else
return ::vswprintf_l(str, capacity, locale, format, arg); va_list arg_mutable;
va_copy(arg_mutable, arg);
return ::vswprintf_l(str, capacity, locale, format, arg_mutable);
#endif #endif
} }
/// \endcond /// \endcond