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authorGabriel Ravier <gabravier@gmail.com>2023-01-04 16:07:19 +0100
committerRich Felker <dalias@aerifal.cx>2023-02-12 17:50:59 -0500
commit07616721f1fa6cb215ffbef23441cae80412484f (patch)
tree58c92a1039672246f43cc776bbbf5d93ad561169 /src/multibyte/mblen.c
parent35fdfe62a4ff471074ca53b7626ec80e83d244bd (diff)
downloadmusl-07616721f1fa6cb215ffbef23441cae80412484f.tar.gz
fix return value of wcs{,n}cmp for extreme wchar_t values
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.
Diffstat (limited to 'src/multibyte/mblen.c')
0 files changed, 0 insertions, 0 deletions