icu collator lt

/*
collator sample:
https://github.com/unicode-org/icu/tree/master/icu4c/source/samples/coll

collation examples:
http://userguide.icu-project.org/collation/examples

rules:
https://unicode.org/repos/cldr/trunk/common/collation/lt.xml

build:
gcc -Wall -Wextra -Wpedantic -c -o main.o main.c
gcc -o test_icu_collator main.o `icu-config --ldflags`

 */

#include <stdio.h>
#include <stdlib.h>

#include <unicode/utypes.h>
#include <unicode/ucol.h>
#include <unicode/ustring.h>

void swap(char** a, char** b)
{
    char* tmp;

    tmp = *a;
    *a = *b;
    *b = tmp;

}

int sCmp(UCollator *coll, char* str2, char* str1)
{
    UChar str1Unsc[128];
    UChar str2Unsc[128];

    u_unescape(str1, str1Unsc, 128);
    u_unescape(str2, str2Unsc, 128);

    UCollationResult result = ucol_strcoll(coll, str1Unsc, -1, str2Unsc, -1);

    if (result == UCOL_LESS) return -1;
    else if (result == UCOL_GREATER) return 1;

    return 0;
}

int main (int argc, char **argv)
{

    UErrorCode status = U_ZERO_ERROR;

    UChar rulesUnsc[128];

    char strRules[]={"&A<<ą<<<Ą&C<č<<<Č&E<<ę<<<Ę<<ė<<<Ė&I<<į<<<Į<<y<<<Y&S<š<<<Š&U<<ų<<<Ų<<ū<<<Ū&Z<ž<<<Ž"};

    char *strArr[] = {"Žuvis","Arbūzas","Eglė","Klaviatūra","žvejys","klaviatūra","arbūzas","fabrikas","Fabrikas","Ąsotis"};

    uint32_t i, j;


    u_unescape(strRules, rulesUnsc, 128);

    UCollator *coll = ucol_openRules(rulesUnsc, -1, UCOL_OFF, UCOL_TERTIARY, NULL, &status);

    if(!U_SUCCESS(status))
    {
        printf("ERROR: ucol_open failed.\n");
        return -1;
    }

    ucol_setAttribute(coll, UCOL_CASE_FIRST, UCOL_UPPER_FIRST, &status);

    uint32_t arrSize = sizeof(strArr)/sizeof(strArr[0]);

    for(i=0;i<arrSize;i++) printf("[%s] ",strArr[i]);
    printf("\n");

    for(i=arrSize-1; i>=1; i--)
    {
        for(j=0; j<i; j++)
        {
            if(sCmp(coll, strArr[j], strArr[j+1]) == -1)
            {

                swap(&strArr[j], &strArr[j+1]);

                //char* tmp = strArr[j];
                //strArr[j] = strArr[j+1];
                //strArr[j+1] = tmp;

            }
        }
    }

    for(i=0;i<arrSize;i++) printf("[%s] ",strArr[i]);
    printf("\n");

    ucol_close(coll);

    return 0;
}

/*
output:

[Žuvis] [Arbūzas] [Eglė] [Klaviatūra] [žvejys] [klaviatūra] [arbūzas] [fabrikas] [Fabrikas] [Ąsotis]
[Arbūzas] [arbūzas] [Ąsotis] [Eglė] [Fabrikas] [fabrikas] [Klaviatūra] [klaviatūra] [Žuvis] [žvejys]

 */