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libroot: Fix handling of n=0 in mbrtowc.

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Fixes #18350.
This commit is contained in:
Augustin Cavalier 2023-04-10 11:25:15 -04:00
parent f6395def52
commit 5cbb772a4d
1 changed files with 2 additions and 0 deletions
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src/system/libroot/posix/wchar/mbrtowc.cpp
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@ -34,6 +34,8 @@ __mbrtowc(wchar_t* pwc, const char* s, size_t n, mbstate_t* ps)
if (s == NULL)
return __mbrtowc(NULL, "", 1, ps);
if (n == 0)
return (size_t)-2;
LocaleBackend* backend = GetCurrentLocaleBackend();