Utility function to compare strings lexicographically. Used internally in IupMatrixEx when sorting, but available in the main library.
This means that numbers and text in the string are sorted separately (for ex: A1 A2 A11 A30 B1). Also natural alphabetic order is used: 123...aAáÁ...bBcC... The comparison will work only for Latin-1 characters, even if UTF8MODE is Yes.
int IupStringCompare(const char* str1, const char* str2, int casesensitive, int lexicographic); [in C] iup.StringCompare(str1, str2: string[, casesensitive, lexicographic: number]) -> ret: integer [in Lua]
str1 and str2: strings to be compared.
casesensitive: flag to enable case sensitive compare. Can be 0 (disable) or 1 (enable). In Lua the default value is 0.
lexicographic: flag to enable lexicographic compare. Can be 0 (disable) or 1 (enable). When disabled the compare will only return if the strings are equal (0) or different (1). In Lua the default value is 1.
Returns: 0 if str1 == str2, -1 if str1<str2, 1 if str1 > str2 (same return values of the strcmp function).
The Alphanum Algorithm is discussed at http://www.DaveKoelle.com/alphanum.html.
This implementation is Copyright (c) 2008 Dirk Jagdmann <firstname.lastname@example.org>. It is a cleanroom implementation of the algorithm and not derived by other's works. In contrast to the versions written by Dave Koelle this source code is distributed with the libpng/zlib license.
The IUP implementation is based on the "alphanum.hpp" code downloaded from the Dave Koelle page and implemented by Dirk Jagdmann. It was modified to the C language and simplified to IUP needs.