musl - musl - an implementation of the standard library for Linux-based systems

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/string/wcscmp.c')

1 files changed, 1 insertions, 1 deletions