indigo. icu. ustring

int32_t function( UChar  * s1, int32_t  length1, UChar  * s2, int32_t  length2, UBool  codePointOrder ) u_strCompare

Compare two Unicode strings (binary order).  The comparison can be done in code unit order or in code point order.  They differ only in UTF-16 when comparing supplementary code points (U+10000..U+10ffff) to BMP code points near the end of the BMP (i.e., U+e000..U+ffff).  In code unit order, high BMP code points sort after supplementary code points because they are stored as pairs of surrogates which are at U+d800..U+dfff.

int32_t function( UChar  * s1, int32_t  length1, UChar  * s2, int32_t  length2, uint32_t  options, UErrorCode  * pErrorCode ) u_strCaseCompare

Compare two strings case-insensitively using full case folding.  The comparison can be done in UTF-16 code unit order or in code point order.  They differ only when comparing supplementary code points (U+10000..U+10ffff) to BMP code points near the end of the BMP (i.e.  U+e000..U+ffff).  In code unit order, high BMP code points sort after supplementary code points because they are stored as pairs of surrogates which are at U+d800..U+dfff.

int32_t function( UChar  * dest, int32_t  destCapacity, UChar  * src, int32_t  srcLength, char  * locale, UErrorCode  * pErrorCode ) u_strToUpper

Uppercase the characters in a string.  Casing is locale-dependent and context-sensitive.  The result may be longer or shorter than the original.  The source string and the destination buffer are allowed to overlap.

int32_t function( UChar  * dest, int32_t  destCapacity, UChar  * src, int32_t  srcLength, char  * locale, UErrorCode  * pErrorCode ) u_strToLower

Lowercase the characters in a string.  Casing is locale-dependent and context-sensitive.  The result may be longer or shorter than the original.  The source string and the destination buffer are allowed to overlap.