musl/src/string/wcscmp.c, branch master musl - an implementation of the standard library for Linux-based systems fix return value of wcs{,n}cmp for extreme wchar_t values 2023年02月12日T22:50:59+00:00 Gabriel Ravier gabravier@gmail.com 2023年01月04日T15:07:19+00:00 07616721f1fa6cb215ffbef23441cae80412484f As a result of using simple subtraction to implement the return values for wcscmp and wcsncmp, integer overflow can occur (producing undefined behavior, and in practice, a wrong comparison result). This does not occur for meaningful character values (21-bit range) but the functions are specified to work on arbitrary wchar_t arrays. This patch replaces the subtraction with a little bit of code that orders the characters correctly, returning -1 if the character from the first string is smaller than the one from the second, 0 if they are equal and 1 if the character from the first string is larger than the one from the second. 
As a result of using simple subtraction to implement the return values
for wcscmp and wcsncmp, integer overflow can occur (producing
undefined behavior, and in practice, a wrong comparison result). This
does not occur for meaningful character values (21-bit range) but the
functions are specified to work on arbitrary wchar_t arrays.
This patch replaces the subtraction with a little bit of code that
orders the characters correctly, returning -1 if the character from
the first string is smaller than the one from the second, 0 if they
are equal and 1 if the character from the first string is larger than
the one from the second.
initial check-in, version 0.5.0 2011年02月12日T05:22:29+00:00 Rich Felker dalias@aerifal.cx 2011年02月12日T05:22:29+00:00 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01

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