/********************************************************************
 * COPYRIGHT: 
 * Copyright (c) 2004-2008, International Business Machines Corporation and
 * others. All Rights Reserved.
 ********************************************************************/
/********************************************************************************
*
* File reapits.c
*
*********************************************************************************/
/*C API TEST FOR Regular Expressions */
/**
*   This is an API test for ICU regular expressions in C.  It doesn't test very many cases, and doesn't
*   try to test the full functionality.  It just calls each function and verifies that it
*   works on a basic level.
*
*   More complete testing of regular expression functionality is done with the C++ tests.
**/

#include "unicode/utypes.h"

#if !UCONFIG_NO_REGULAR_EXPRESSIONS

#include <stdlib.h>
#include <string.h>
#include "unicode/uloc.h"
#include "unicode/uregex.h"
#include "unicode/ustring.h"
#include "cintltst.h"

#define TEST_ASSERT_SUCCESS(status) {if (U_FAILURE(status)) { \
log_err("Failure at file %s, line %d, error = %s\n", __FILE__, __LINE__, u_errorName(status));}}

#define TEST_ASSERT(expr) {if ((expr)==FALSE) { \
log_err("Test Failure at file %s, line %d\n", __FILE__, __LINE__);}}

/*
 *   TEST_SETUP and TEST_TEARDOWN
 *         macros to handle the boilerplate around setting up regex test cases.
 *         parameteres to setup:
 *              pattern:     The regex pattern, a (char *) null terminated C string.
 *              testString:  The string data, also a (char *) C string.
 *              flags:       Regex flags to set when compiling the pattern
 *
 *         Put arbitrary test code between SETUP and TEARDOWN.
 *         're" is the compiled, ready-to-go  regular expression.
 */
#define TEST_SETUP(pattern, testString, flags) {  \
    UChar   *srcString = NULL;  \
    status = U_ZERO_ERROR; \
    re = uregex_openC(pattern, flags, NULL, &status);  \
    TEST_ASSERT_SUCCESS(status);   \
    srcString = (UChar *)malloc((strlen(testString)+2)*sizeof(UChar)); \
    u_uastrncpy(srcString, testString,  strlen(testString)+1); \
    uregex_setText(re, srcString, -1, &status); \
    TEST_ASSERT_SUCCESS(status);  \
    if (U_SUCCESS(status)) {
    
#define TEST_TEARDOWN  \
    }  \
    TEST_ASSERT_SUCCESS(status);  \
    uregex_close(re);  \
    free(srcString);   \
    }


static void test_assert_string(const char *expected, const UChar *actual, UBool nulTerm, const char *file, int line) {
     char     buf_inside_macro[120];
     int32_t  len = (int32_t)strlen(expected);
     UBool    success;
     if (nulTerm) {
         u_austrncpy(buf_inside_macro, (actual), len+1);
         buf_inside_macro[len+2] = 0;
         success = (strcmp((expected), buf_inside_macro) == 0);
     } else {
         u_austrncpy(buf_inside_macro, (actual), len);
         buf_inside_macro[len+1] = 0;
         success = (strncmp((expected), buf_inside_macro, len) == 0);
     }
     if (success == FALSE) {
         log_err("Failure at file %s, line %d, expected \"%s\", got \"%s\"\n",
             file, line, (expected), buf_inside_macro);
     }
}

#define TEST_ASSERT_STRING(expected, actual, nulTerm) test_assert_string(expected, actual, nulTerm, __FILE__, __LINE__)
             

static void TestRegexCAPI(void);
static void TestBug4315(void);

void addURegexTest(TestNode** root);

void addURegexTest(TestNode** root)
{
    addTest(root, &TestRegexCAPI, "regex/TestRegexCAPI");
    addTest(root, &TestBug4315,   "regex/TestBug4315");
}

/*
 * Call back function and context struct used for testing
 *    regular expression user callbacks.  This test is mostly the same as
 *   the corresponding C++ test in intltest. 
 */
typedef struct callBackContext {
    int32_t          maxCalls;
    int32_t          numCalls;
    int32_t          lastSteps;
} callBackContext;

static UBool U_EXPORT2 U_CALLCONV
TestCallbackFn(const void *context, int32_t steps) {
  callBackContext  *info = (callBackContext *)context;
  if (info->lastSteps+1 != steps) {
      log_err("incorrect steps in callback.  Expected %d, got %d\n", info->lastSteps+1, steps);
  }
  info->lastSteps = steps;
  info->numCalls++;
  return (info->numCalls < info->maxCalls);
}

/*
 *   Regular Expression C API Tests
 */
static void TestRegexCAPI(void) {
    UErrorCode           status = U_ZERO_ERROR;
    URegularExpression  *re;
    UChar                pat[200];
    UChar               *minus1;

    memset(&minus1, -1, sizeof(minus1));

    /* Mimimalist open/close */
    u_uastrncpy(pat, "abc*", sizeof(pat)/2);
    re = uregex_open(pat, -1, 0, 0, &status);
    if (U_FAILURE(status)) {
         log_err("Failed to open regular expression, line %d, error is \"%s\"\n", __LINE__, u_errorName(status));
         return;
    }
    uregex_close(re);

    /* Open with all flag values set */
    status = U_ZERO_ERROR;
    re = uregex_open(pat, -1, 
        UREGEX_CASE_INSENSITIVE | UREGEX_COMMENTS | UREGEX_DOTALL | UREGEX_MULTILINE | UREGEX_UWORD,
        0, &status);
    TEST_ASSERT_SUCCESS(status);
    uregex_close(re);

    /* Open with an invalid flag */
    status = U_ZERO_ERROR;
    re = uregex_open(pat, -1, 0x40000000, 0, &status);
    TEST_ASSERT(status == U_REGEX_INVALID_FLAG);
    uregex_close(re);

    /* openC with an invalid parameter */
    status = U_ZERO_ERROR;
    re = uregex_openC(NULL,
        UREGEX_CASE_INSENSITIVE | UREGEX_COMMENTS | UREGEX_DOTALL | UREGEX_MULTILINE | UREGEX_UWORD, 0, &status);
    TEST_ASSERT(status == U_ILLEGAL_ARGUMENT_ERROR && re == NULL);

    /* openC with an invalid parameter */
    status = U_USELESS_COLLATOR_ERROR;
    re = uregex_openC(NULL,
        UREGEX_CASE_INSENSITIVE | UREGEX_COMMENTS | UREGEX_DOTALL | UREGEX_MULTILINE | UREGEX_UWORD, 0, &status);
    TEST_ASSERT(status == U_USELESS_COLLATOR_ERROR && re == NULL);

    /* openC   open from a C string */
    {
        const UChar   *p;
        int32_t  len;
        status = U_ZERO_ERROR;
        re = uregex_openC("abc*", 0, 0, &status);
        TEST_ASSERT_SUCCESS(status);
        p = uregex_pattern(re, &len, &status);
        TEST_ASSERT_SUCCESS(status);

        /* The TEST_ASSERT_SUCCESS above should change too... */
        if(U_SUCCESS(status)) {
            u_uastrncpy(pat, "abc*", sizeof(pat)/2);
            TEST_ASSERT(u_strcmp(pat, p) == 0);
            TEST_ASSERT(len==(int32_t)strlen("abc*"));
        }

        uregex_close(re);

        /*  TODO:  Open with ParseError parameter */
    }

    /*
     *  clone
     */
    {
        URegularExpression *clone1;
        URegularExpression *clone2;
        URegularExpression *clone3;
        UChar  testString1[30];
        UChar  testString2[30];
        UBool  result;


        status = U_ZERO_ERROR;
        re = uregex_openC("abc*", 0, 0, &status);
        TEST_ASSERT_SUCCESS(status);
        clone1 = uregex_clone(re, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT(clone1 != NULL);

        status = U_ZERO_ERROR;
        clone2 = uregex_clone(re, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT(clone2 != NULL);
        uregex_close(re);

        status = U_ZERO_ERROR;
        clone3 = uregex_clone(clone2, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT(clone3 != NULL);

        u_uastrncpy(testString1, "abcccd", sizeof(pat)/2);
        u_uastrncpy(testString2, "xxxabcccd", sizeof(pat)/2);

        status = U_ZERO_ERROR;
        uregex_setText(clone1, testString1, -1, &status);
        TEST_ASSERT_SUCCESS(status);
        result = uregex_lookingAt(clone1, 0, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT(result==TRUE);
        
        status = U_ZERO_ERROR;
        uregex_setText(clone2, testString2, -1, &status);
        TEST_ASSERT_SUCCESS(status);
        result = uregex_lookingAt(clone2, 0, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT(result==FALSE);
        result = uregex_find(clone2, 0, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT(result==TRUE);

        uregex_close(clone1);
        uregex_close(clone2);
        uregex_close(clone3);

    }

    /*
     *  pattern()
    */
    {
        const UChar  *resultPat;
        int32_t       resultLen;
        u_uastrncpy(pat, "hello", sizeof(pat)/2);
        status = U_ZERO_ERROR;
        re = uregex_open(pat, -1, 0, NULL, &status);
        resultPat = uregex_pattern(re, &resultLen, &status);
        TEST_ASSERT_SUCCESS(status);

        /* The TEST_ASSERT_SUCCESS above should change too... */
        if (U_SUCCESS(status)) {
            TEST_ASSERT(resultLen == -1);
            TEST_ASSERT(u_strcmp(resultPat, pat) == 0);
        }

        uregex_close(re);

        status = U_ZERO_ERROR;
        re = uregex_open(pat, 3, 0, NULL, &status);
        resultPat = uregex_pattern(re, &resultLen, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT_SUCCESS(status);

        /* The TEST_ASSERT_SUCCESS above should change too... */
        if (U_SUCCESS(status)) {
            TEST_ASSERT(resultLen == 3);
            TEST_ASSERT(u_strncmp(resultPat, pat, 3) == 0);
            TEST_ASSERT(u_strlen(resultPat) == 3);
        }

        uregex_close(re);
    }

    /*
     *  flags()
     */
    {
        int32_t  t;

        status = U_ZERO_ERROR;
        re = uregex_open(pat, -1, 0, NULL, &status);
        t  = uregex_flags(re, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT(t == 0);
        uregex_close(re);

        status = U_ZERO_ERROR;
        re = uregex_open(pat, -1, 0, NULL, &status);
        t  = uregex_flags(re, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT(t == 0);
        uregex_close(re);

        status = U_ZERO_ERROR;
        re = uregex_open(pat, -1, UREGEX_CASE_INSENSITIVE | UREGEX_DOTALL, NULL, &status);
        t  = uregex_flags(re, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT(t == (UREGEX_CASE_INSENSITIVE | UREGEX_DOTALL));
        uregex_close(re);
    }

    /*
     *  setText() and lookingAt()
     */
    {
        UChar  text1[50];
        UChar  text2[50];
        UBool  result;

        u_uastrncpy(text1, "abcccd",  sizeof(text1)/2);
        u_uastrncpy(text2, "abcccxd", sizeof(text2)/2);
        status = U_ZERO_ERROR;
        u_uastrncpy(pat, "abc*d", sizeof(pat)/2);
        re = uregex_open(pat, -1, 0, NULL, &status);
        TEST_ASSERT_SUCCESS(status);

        /* Operation before doing a setText should fail... */
        status = U_ZERO_ERROR;
        uregex_lookingAt(re, 0, &status);
        TEST_ASSERT( status== U_REGEX_INVALID_STATE);

        status = U_ZERO_ERROR;
        uregex_setText(re, text1, -1, &status);
        result = uregex_lookingAt(re, 0, &status);
        TEST_ASSERT(result == TRUE);
        TEST_ASSERT_SUCCESS(status);

        status = U_ZERO_ERROR;
        uregex_setText(re, text2, -1, &status);
        result = uregex_lookingAt(re, 0, &status);
        TEST_ASSERT(result == FALSE);
        TEST_ASSERT_SUCCESS(status);

        status = U_ZERO_ERROR;
        uregex_setText(re, text1, -1, &status);
        result = uregex_lookingAt(re, 0, &status);
        TEST_ASSERT(result == TRUE);
        TEST_ASSERT_SUCCESS(status);

        status = U_ZERO_ERROR;
        uregex_setText(re, text1, 5, &status);
        result = uregex_lookingAt(re, 0, &status);
        TEST_ASSERT(result == FALSE);
        TEST_ASSERT_SUCCESS(status);

        status = U_ZERO_ERROR;
        uregex_setText(re, text1, 6, &status);
        result = uregex_lookingAt(re, 0, &status);
        TEST_ASSERT(result == TRUE);
        TEST_ASSERT_SUCCESS(status);

        uregex_close(re);
    }


    /*
     *  getText() 
     */
    {
        UChar    text1[50];
        UChar    text2[50];
        const UChar   *result;
        int32_t  textLength;

        u_uastrncpy(text1, "abcccd",  sizeof(text1)/2);
        u_uastrncpy(text2, "abcccxd", sizeof(text2)/2);
        status = U_ZERO_ERROR;
        u_uastrncpy(pat, "abc*d", sizeof(pat)/2);
        re = uregex_open(pat, -1, 0, NULL, &status);

        uregex_setText(re, text1, -1, &status);
        result = uregex_getText(re, &textLength, &status);
        TEST_ASSERT(result == text1);
        TEST_ASSERT(textLength == -1);
        TEST_ASSERT_SUCCESS(status);

        status = U_ZERO_ERROR;
        uregex_setText(re, text2, 7, &status);
        result = uregex_getText(re, &textLength, &status);
        TEST_ASSERT(result == text2);
        TEST_ASSERT(textLength == 7);
        TEST_ASSERT_SUCCESS(status);

        status = U_ZERO_ERROR;
        uregex_setText(re, text2, 4, &status);
        result = uregex_getText(re, &textLength, &status);
        TEST_ASSERT(result == text2);
        TEST_ASSERT(textLength == 4);
        TEST_ASSERT_SUCCESS(status);
        uregex_close(re);
    }

    /*
     *  matches()
     */
    {
        UChar   text1[50];
        UBool   result;
        int     len;
        UChar   nullString[] = {0,0,0};

        u_uastrncpy(text1, "abcccde",  sizeof(text1)/2);
        status = U_ZERO_ERROR;
        u_uastrncpy(pat, "abc*d", sizeof(pat)/2);
        re = uregex_open(pat, -1, 0, NULL, &status);

        uregex_setText(re, text1, -1, &status);
        result = uregex_matches(re, 0, &status);
        TEST_ASSERT(result == FALSE);
        TEST_ASSERT_SUCCESS(status);

        status = U_ZERO_ERROR;
        uregex_setText(re, text1, 6, &status);
        result = uregex_matches(re, 0, &status);
        TEST_ASSERT(result == TRUE);
        TEST_ASSERT_SUCCESS(status);

        status = U_ZERO_ERROR;
        uregex_setText(re, text1, 6, &status);
        result = uregex_matches(re, 1, &status);
        TEST_ASSERT(result == FALSE);
        TEST_ASSERT_SUCCESS(status);
        uregex_close(re);

        status = U_ZERO_ERROR;
        re = uregex_openC(".?", 0, NULL, &status);
        uregex_setText(re, text1, -1, &status);
        len = u_strlen(text1);
        result = uregex_matches(re, len, &status);
        TEST_ASSERT(result == TRUE);
        TEST_ASSERT_SUCCESS(status);

        status = U_ZERO_ERROR;
        uregex_setText(re, nullString, -1, &status);
        TEST_ASSERT_SUCCESS(status);
        result = uregex_matches(re, 0, &status);
        TEST_ASSERT(result == TRUE);
        TEST_ASSERT_SUCCESS(status);
        uregex_close(re);
    }


    /*
     *  lookingAt()    Used in setText test.
     */


    /*
     *  find(), findNext, start, end, reset
     */
    {
        UChar    text1[50];
        UBool    result;
        u_uastrncpy(text1, "012rx5rx890rxrx...",  sizeof(text1)/2);
        status = U_ZERO_ERROR;
        re = uregex_openC("rx", 0, NULL, &status);

        uregex_setText(re, text1, -1, &status);
        result = uregex_find(re, 0, &status);
        TEST_ASSERT(result == TRUE);
        TEST_ASSERT(uregex_start(re, 0, &status) == 3);
        TEST_ASSERT(uregex_end(re, 0, &status) == 5);
        TEST_ASSERT_SUCCESS(status);

        result = uregex_find(re, 9, &status);
        TEST_ASSERT(result == TRUE);
        TEST_ASSERT(uregex_start(re, 0, &status) == 11);
        TEST_ASSERT(uregex_end(re, 0, &status) == 13);
        TEST_ASSERT_SUCCESS(status);

        result = uregex_find(re, 14, &status);
        TEST_ASSERT(result == FALSE);
        TEST_ASSERT_SUCCESS(status);

        status = U_ZERO_ERROR;
        uregex_reset(re, 0, &status);

        result = uregex_findNext(re, &status);
        TEST_ASSERT(result == TRUE);
        TEST_ASSERT(uregex_start(re, 0, &status) == 3);
        TEST_ASSERT(uregex_end(re, 0, &status) == 5);
        TEST_ASSERT_SUCCESS(status);

        result = uregex_findNext(re, &status);
        TEST_ASSERT(result == TRUE);
        TEST_ASSERT(uregex_start(re, 0, &status) == 6);
        TEST_ASSERT(uregex_end(re, 0, &status) == 8);
        TEST_ASSERT_SUCCESS(status);

        status = U_ZERO_ERROR;
        uregex_reset(re, 12, &status);

        result = uregex_findNext(re, &status);
        TEST_ASSERT(result == TRUE);
        TEST_ASSERT(uregex_start(re, 0, &status) == 13);
        TEST_ASSERT(uregex_end(re, 0, &status) == 15);
        TEST_ASSERT_SUCCESS(status);

        result = uregex_findNext(re, &status);
        TEST_ASSERT(result == FALSE);
        TEST_ASSERT_SUCCESS(status);

        uregex_close(re);
    }

    /*
     *  groupCount
     */
    {
        int32_t result;

        status = U_ZERO_ERROR;
        re = uregex_openC("abc", 0, NULL, &status);
        result = uregex_groupCount(re, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT(result == 0);
        uregex_close(re);

        status = U_ZERO_ERROR;
        re = uregex_openC("abc(def)(ghi(j))", 0, NULL, &status);
        result = uregex_groupCount(re, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT(result == 3);
        uregex_close(re);

    }


    /*
     *  group()
     */
    {
        UChar    text1[80];
        UChar    buf[80];
        UBool    result;
        int32_t  resultSz;
        u_uastrncpy(text1, "noise abc interior def, and this is off the end",  sizeof(text1)/2);

        status = U_ZERO_ERROR;
        re = uregex_openC("abc(.*?)def", 0, NULL, &status);
        TEST_ASSERT_SUCCESS(status);


        uregex_setText(re, text1, -1, &status);
        result = uregex_find(re, 0, &status);
        TEST_ASSERT(result==TRUE);

        /*  Capture Group 0, the full match.  Should succeed.  */
        status = U_ZERO_ERROR;
        resultSz = uregex_group(re, 0, buf, sizeof(buf)/2, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT_STRING("abc interior def", buf, TRUE);
        TEST_ASSERT(resultSz == (int32_t)strlen("abc interior def"));

        /*  Capture group #1.  Should succeed. */
        status = U_ZERO_ERROR;
        resultSz = uregex_group(re, 1, buf, sizeof(buf)/2, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT_STRING(" interior ", buf, TRUE);
        TEST_ASSERT(resultSz == (int32_t)strlen(" interior "));

        /*  Capture group out of range.  Error. */
        status = U_ZERO_ERROR;
        uregex_group(re, 2, buf, sizeof(buf)/2, &status);
        TEST_ASSERT(status == U_INDEX_OUTOFBOUNDS_ERROR);

        /* NULL buffer, pure pre-flight */
        status = U_ZERO_ERROR;
        resultSz = uregex_group(re, 0, NULL, 0, &status);
        TEST_ASSERT(status == U_BUFFER_OVERFLOW_ERROR);
        TEST_ASSERT(resultSz == (int32_t)strlen("abc interior def"));

        /* Too small buffer, truncated string */
        status = U_ZERO_ERROR;
        memset(buf, -1, sizeof(buf));
        resultSz = uregex_group(re, 0, buf, 5, &status);
        TEST_ASSERT(status == U_BUFFER_OVERFLOW_ERROR);
        TEST_ASSERT_STRING("abc i", buf, FALSE);
        TEST_ASSERT(buf[5] == (UChar)0xffff);
        TEST_ASSERT(resultSz == (int32_t)strlen("abc interior def"));

        /* Output string just fits buffer, no NUL term. */
        status = U_ZERO_ERROR;
        resultSz = uregex_group(re, 0, buf, (int32_t)strlen("abc interior def"), &status);
        TEST_ASSERT(status == U_STRING_NOT_TERMINATED_WARNING);
        TEST_ASSERT_STRING("abc interior def", buf, FALSE);
        TEST_ASSERT(resultSz == (int32_t)strlen("abc interior def"));
        TEST_ASSERT(buf[strlen("abc interior def")] == (UChar)0xffff);
        
        uregex_close(re);

    }
    
    /*
     *  Regions
     */
        
        
        /* SetRegion(), getRegion() do something  */
        TEST_SETUP(".*", "0123456789ABCDEF", 0)
        UChar resultString[40];
        TEST_ASSERT(uregex_regionStart(re, &status) == 0);
        TEST_ASSERT(uregex_regionEnd(re, &status) == 16);
        uregex_setRegion(re, 3, 6, &status);
        TEST_ASSERT(uregex_regionStart(re, &status) == 3);
        TEST_ASSERT(uregex_regionEnd(re, &status) == 6);
        TEST_ASSERT(uregex_findNext(re, &status));
        TEST_ASSERT(uregex_group(re, 0, resultString, sizeof(resultString)/2, &status) == 3)
        TEST_ASSERT_STRING("345", resultString, TRUE);
        TEST_TEARDOWN;
        
        /* find(start=-1) uses regions   */
        TEST_SETUP(".*", "0123456789ABCDEF", 0);
        uregex_setRegion(re, 4, 6, &status);
        TEST_ASSERT(uregex_find(re, -1, &status) == TRUE);
        TEST_ASSERT(uregex_start(re, 0, &status) == 4);
        TEST_ASSERT(uregex_end(re, 0, &status) == 6);
        TEST_TEARDOWN;
        
        /* find (start >=0) does not use regions   */
        TEST_SETUP(".*", "0123456789ABCDEF", 0);
        uregex_setRegion(re, 4, 6, &status);
        TEST_ASSERT(uregex_find(re, 0, &status) == TRUE);
        TEST_ASSERT(uregex_start(re, 0, &status) == 0);
        TEST_ASSERT(uregex_end(re, 0, &status) == 16);
        TEST_TEARDOWN;
         
        /* findNext() obeys regions    */
        TEST_SETUP(".", "0123456789ABCDEF", 0);
        uregex_setRegion(re, 4, 6, &status);
        TEST_ASSERT(uregex_findNext(re,&status) == TRUE);
        TEST_ASSERT(uregex_start(re, 0, &status) == 4);
        TEST_ASSERT(uregex_findNext(re, &status) == TRUE);
        TEST_ASSERT(uregex_start(re, 0, &status) == 5);
        TEST_ASSERT(uregex_findNext(re, &status) == FALSE);
        TEST_TEARDOWN;

        /* matches(start=-1) uses regions                                           */
        /*    Also, verify that non-greedy *? succeeds in finding the full match.   */
        TEST_SETUP(".*?", "0123456789ABCDEF", 0);
        uregex_setRegion(re, 4, 6, &status);
        TEST_ASSERT(uregex_matches(re, -1, &status) == TRUE);
        TEST_ASSERT(uregex_start(re, 0, &status) == 4);
        TEST_ASSERT(uregex_end(re, 0, &status) == 6);
        TEST_TEARDOWN;
        
        /* matches (start >=0) does not use regions       */
        TEST_SETUP(".*?", "0123456789ABCDEF", 0);
        uregex_setRegion(re, 4, 6, &status);
        TEST_ASSERT(uregex_matches(re, 0, &status) == TRUE);
        TEST_ASSERT(uregex_start(re, 0, &status) == 0);
        TEST_ASSERT(uregex_end(re, 0, &status) == 16);
        TEST_TEARDOWN;
        
        /* lookingAt(start=-1) uses regions                                         */
        /*    Also, verify that non-greedy *? finds the first (shortest) match.     */
        TEST_SETUP(".*?", "0123456789ABCDEF", 0);
        uregex_setRegion(re, 4, 6, &status);
        TEST_ASSERT(uregex_lookingAt(re, -1, &status) == TRUE);
        TEST_ASSERT(uregex_start(re, 0, &status) == 4);
        TEST_ASSERT(uregex_end(re, 0, &status) == 4);
        TEST_TEARDOWN;
        
        /* lookingAt (start >=0) does not use regions  */
        TEST_SETUP(".*?", "0123456789ABCDEF", 0);
        uregex_setRegion(re, 4, 6, &status);
        TEST_ASSERT(uregex_lookingAt(re, 0, &status) == TRUE);
        TEST_ASSERT(uregex_start(re, 0, &status) == 0);
        TEST_ASSERT(uregex_end(re, 0, &status) == 0);
        TEST_TEARDOWN;

        /* hitEnd()       */
        TEST_SETUP("[a-f]*", "abcdefghij", 0);
        TEST_ASSERT(uregex_find(re, 0, &status) == TRUE);
        TEST_ASSERT(uregex_hitEnd(re, &status) == FALSE);
        TEST_TEARDOWN;

        TEST_SETUP("[a-f]*", "abcdef", 0);
        TEST_ASSERT(uregex_find(re, 0, &status) == TRUE);
        TEST_ASSERT(uregex_hitEnd(re, &status) == TRUE);
        TEST_TEARDOWN;

        /* requireEnd   */
        TEST_SETUP("abcd", "abcd", 0);
        TEST_ASSERT(uregex_find(re, 0, &status) == TRUE);
        TEST_ASSERT(uregex_requireEnd(re, &status) == FALSE);
        TEST_TEARDOWN;

        TEST_SETUP("abcd$", "abcd", 0);
        TEST_ASSERT(uregex_find(re, 0, &status) == TRUE);
        TEST_ASSERT(uregex_requireEnd(re, &status) == TRUE);
        TEST_TEARDOWN;
        
        /* anchoringBounds        */
        TEST_SETUP("abc$", "abcdef", 0);
        TEST_ASSERT(uregex_hasAnchoringBounds(re, &status) == TRUE);
        uregex_useAnchoringBounds(re, FALSE, &status);
        TEST_ASSERT(uregex_hasAnchoringBounds(re, &status) == FALSE);
        
        TEST_ASSERT(uregex_find(re, -1, &status) == FALSE);
        uregex_useAnchoringBounds(re, TRUE, &status);
        uregex_setRegion(re, 0, 3, &status);
        TEST_ASSERT(uregex_find(re, -1, &status) == TRUE);
        TEST_ASSERT(uregex_end(re, 0, &status) == 3);
        TEST_TEARDOWN;
        
        /* Transparent Bounds      */
        TEST_SETUP("abc(?=def)", "abcdef", 0);
        TEST_ASSERT(uregex_hasTransparentBounds(re, &status) == FALSE);
        uregex_useTransparentBounds(re, TRUE, &status);
        TEST_ASSERT(uregex_hasTransparentBounds(re, &status) == TRUE);
        
        uregex_useTransparentBounds(re, FALSE, &status);
        TEST_ASSERT(uregex_find(re, -1, &status) == TRUE);    /* No Region */
        uregex_setRegion(re, 0, 3, &status);
        TEST_ASSERT(uregex_find(re, -1, &status) == FALSE);   /* with region, opaque bounds */
        uregex_useTransparentBounds(re, TRUE, &status);
        TEST_ASSERT(uregex_find(re, -1, &status) == TRUE);    /* with region, transparent bounds */
        TEST_ASSERT(uregex_end(re, 0, &status) == 3);
        TEST_TEARDOWN;
        

    /*
     *  replaceFirst()
     */
    {
        UChar    text1[80];
        UChar    text2[80];
        UChar    replText[80];
        UChar    buf[80];
        int32_t  resultSz;
        u_uastrncpy(text1, "Replace xaax x1x x...x.",  sizeof(text1)/2);
        u_uastrncpy(text2, "No match here.",  sizeof(text2)/2);
        u_uastrncpy(replText, "<$1>", sizeof(replText)/2);

        status = U_ZERO_ERROR;
        re = uregex_openC("x(.*?)x", 0, NULL, &status);
        TEST_ASSERT_SUCCESS(status);

        /*  Normal case, with match */
        uregex_setText(re, text1, -1, &status);
        resultSz = uregex_replaceFirst(re, replText, -1, buf, sizeof(buf)/2, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT_STRING("Replace <aa> x1x x...x.", buf, TRUE);
        TEST_ASSERT(resultSz == (int32_t)strlen("Replace xaax x1x x...x."));

        /* No match.  Text should copy to output with no changes.  */
        status = U_ZERO_ERROR;
        uregex_setText(re, text2, -1, &status);
        resultSz = uregex_replaceFirst(re, replText, -1, buf, sizeof(buf)/2, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT_STRING("No match here.", buf, TRUE);
        TEST_ASSERT(resultSz == (int32_t)strlen("No match here."));

        /*  Match, output just fills buffer, no termination warning. */
        status = U_ZERO_ERROR;
        uregex_setText(re, text1, -1, &status);
        memset(buf, -1, sizeof(buf));
        resultSz = uregex_replaceFirst(re, replText, -1, buf, strlen("Replace <aa> x1x x...x."), &status);
        TEST_ASSERT(status == U_STRING_NOT_TERMINATED_WARNING);
        TEST_ASSERT_STRING("Replace <aa> x1x x...x.", buf, FALSE);
        TEST_ASSERT(resultSz == (int32_t)strlen("Replace xaax x1x x...x."));
        TEST_ASSERT(buf[resultSz] == (UChar)0xffff);

        /* Do the replaceFirst again, without first resetting anything.
         *  Should give the same results.
         */
        status = U_ZERO_ERROR;
        memset(buf, -1, sizeof(buf));
        resultSz = uregex_replaceFirst(re, replText, -1, buf, strlen("Replace <aa> x1x x...x."), &status);
        TEST_ASSERT(status == U_STRING_NOT_TERMINATED_WARNING);
        TEST_ASSERT_STRING("Replace <aa> x1x x...x.", buf, FALSE);
        TEST_ASSERT(resultSz == (int32_t)strlen("Replace xaax x1x x...x."));
        TEST_ASSERT(buf[resultSz] == (UChar)0xffff);

        /* NULL buffer, zero buffer length */
        status = U_ZERO_ERROR;
        resultSz = uregex_replaceFirst(re, replText, -1, NULL, 0, &status);
        TEST_ASSERT(status == U_BUFFER_OVERFLOW_ERROR);
        TEST_ASSERT(resultSz == (int32_t)strlen("Replace xaax x1x x...x."));

        /* Buffer too small by one */
        status = U_ZERO_ERROR;
        memset(buf, -1, sizeof(buf));
        resultSz = uregex_replaceFirst(re, replText, -1, buf, strlen("Replace <aa> x1x x...x.")-1, &status);
        TEST_ASSERT(status == U_BUFFER_OVERFLOW_ERROR);
        TEST_ASSERT_STRING("Replace <aa> x1x x...x", buf, FALSE);
        TEST_ASSERT(resultSz == (int32_t)strlen("Replace xaax x1x x...x."));
        TEST_ASSERT(buf[resultSz] == (UChar)0xffff);

        uregex_close(re);
    }


    /*
     *  replaceAll()
     */
    {
        UChar    text1[80];
        UChar    text2[80];
        UChar    replText[80];
        UChar    buf[80];
        int32_t  resultSz;
        int32_t  expectedResultSize;
        int32_t  i;

        u_uastrncpy(text1, "Replace xaax x1x x...x.",  sizeof(text1)/2);
        u_uastrncpy(text2, "No match here.",  sizeof(text2)/2);
        u_uastrncpy(replText, "<$1>", sizeof(replText)/2);
        expectedResultSize = u_strlen(text1);

        status = U_ZERO_ERROR;
        re = uregex_openC("x(.*?)x", 0, NULL, &status);
        TEST_ASSERT_SUCCESS(status);

        /*  Normal case, with match */
        uregex_setText(re, text1, -1, &status);
        resultSz = uregex_replaceAll(re, replText, -1, buf, sizeof(buf)/2, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT_STRING("Replace <aa> <1> <...>.", buf, TRUE);
        TEST_ASSERT(resultSz == (int32_t)strlen("Replace xaax x1x x...x."));

        /* No match.  Text should copy to output with no changes.  */
        status = U_ZERO_ERROR;
        uregex_setText(re, text2, -1, &status);
        resultSz = uregex_replaceAll(re, replText, -1, buf, sizeof(buf)/2, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT_STRING("No match here.", buf, TRUE);
        TEST_ASSERT(resultSz == (int32_t)strlen("No match here."));

        /*  Match, output just fills buffer, no termination warning. */
        status = U_ZERO_ERROR;
        uregex_setText(re, text1, -1, &status);
        memset(buf, -1, sizeof(buf));
        resultSz = uregex_replaceAll(re, replText, -1, buf, strlen("Replace xaax x1x x...x."), &status);
        TEST_ASSERT(status == U_STRING_NOT_TERMINATED_WARNING);
        TEST_ASSERT_STRING("Replace <aa> <1> <...>.", buf, FALSE);
        TEST_ASSERT(resultSz == (int32_t)strlen("Replace <aa> <1> <...>."));
        TEST_ASSERT(buf[resultSz] == (UChar)0xffff);

        /* Do the replaceFirst again, without first resetting anything.
         *  Should give the same results.
         */
        status = U_ZERO_ERROR;
        memset(buf, -1, sizeof(buf));
        resultSz = uregex_replaceAll(re, replText, -1, buf, strlen("Replace xaax x1x x...x."), &status);
        TEST_ASSERT(status == U_STRING_NOT_TERMINATED_WARNING);
        TEST_ASSERT_STRING("Replace <aa> <1> <...>.", buf, FALSE);
        TEST_ASSERT(resultSz == (int32_t)strlen("Replace <aa> <1> <...>."));
        TEST_ASSERT(buf[resultSz] == (UChar)0xffff);

        /* NULL buffer, zero buffer length */
        status = U_ZERO_ERROR;
        resultSz = uregex_replaceAll(re, replText, -1, NULL, 0, &status);
        TEST_ASSERT(status == U_BUFFER_OVERFLOW_ERROR);
        TEST_ASSERT(resultSz == (int32_t)strlen("Replace <aa> <1> <...>."));

        /* Buffer too small.  Try every size, which will tickle edge cases
         * in uregex_appendReplacement (used by replaceAll)   */
        for (i=0; i<expectedResultSize; i++) {
            char  expected[80];
            status = U_ZERO_ERROR;
            memset(buf, -1, sizeof(buf));
            resultSz = uregex_replaceAll(re, replText, -1, buf, i, &status);
            TEST_ASSERT(status == U_BUFFER_OVERFLOW_ERROR);
            strcpy(expected, "Replace <aa> <1> <...>.");
            expected[i] = 0;
            TEST_ASSERT_STRING(expected, buf, FALSE);
            TEST_ASSERT(resultSz == expectedResultSize);
            TEST_ASSERT(buf[i] == (UChar)0xffff);
        }

        uregex_close(re);
    }


    /*
     *  appendReplacement()
     */
    {
        UChar    text[100];
        UChar    repl[100];
        UChar    buf[100];
        UChar   *bufPtr;
        int32_t  bufCap;


        status = U_ZERO_ERROR;
        re = uregex_openC(".*", 0, 0, &status);
        TEST_ASSERT_SUCCESS(status);

        u_uastrncpy(text, "whatever",  sizeof(text)/2);
        u_uastrncpy(repl, "some other", sizeof(repl)/2);
        uregex_setText(re, text, -1, &status);

        /* match covers whole target string */
        uregex_find(re, 0, &status);
        TEST_ASSERT_SUCCESS(status);
        bufPtr = buf;
        bufCap = sizeof(buf) / 2;
        uregex_appendReplacement(re, repl, -1, &bufPtr, &bufCap, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT_STRING("some other", buf, TRUE);

        /* Match has \u \U escapes */
        uregex_find(re, 0, &status);
        TEST_ASSERT_SUCCESS(status);
        bufPtr = buf;
        bufCap = sizeof(buf) / 2;
        u_uastrncpy(repl, "abc\\u0041\\U00000042 \\\\ $ \\abc", sizeof(repl)/2);
        uregex_appendReplacement(re, repl, -1, &bufPtr, &bufCap, &status);
        TEST_ASSERT_SUCCESS(status);
        TEST_ASSERT_STRING("abcAB \\ $ abc", buf, TRUE); 

        uregex_close(re);
    }


    /*
     *  appendTail().   Checked in ReplaceFirst(), replaceAll().
     */

    /*
     *  split()
     */
    {
        UChar    textToSplit[80];
        UChar    text2[80];
        UChar    buf[200];
        UChar    *fields[10];
        int32_t  numFields;
        int32_t  requiredCapacity;
        int32_t  spaceNeeded;
        int32_t  sz;

        u_uastrncpy(textToSplit, "first : second:  third",  sizeof(textToSplit)/2);
        u_uastrncpy(text2, "No match here.",  sizeof(text2)/2);

        status = U_ZERO_ERROR;
        re = uregex_openC(":", 0, NULL, &status);


        /*  Simple split */ 

        uregex_setText(re, textToSplit, -1, &status);
        TEST_ASSERT_SUCCESS(status);

        /* The TEST_ASSERT_SUCCESS call above should change too... */
        if (U_SUCCESS(status)) {
            memset(fields, -1, sizeof(fields));
            numFields = 
                uregex_split(re, buf, sizeof(buf)/2, &requiredCapacity, fields, 10, &status);
            TEST_ASSERT_SUCCESS(status);

            /* The TEST_ASSERT_SUCCESS call above should change too... */
            if(U_SUCCESS(status)) {
                TEST_ASSERT(numFields == 3);
                TEST_ASSERT_STRING("first ",  fields[0], TRUE);
                TEST_ASSERT_STRING(" second", fields[1], TRUE);
                TEST_ASSERT_STRING("  third", fields[2], TRUE);
                TEST_ASSERT(fields[3] == NULL);

                spaceNeeded = u_strlen(textToSplit) -
                            (numFields - 1)  +  /* Field delimiters do not appear in output */
                            numFields;          /* Each field gets a NUL terminator */ 

                TEST_ASSERT(spaceNeeded == requiredCapacity);
            }
        }

        uregex_close(re);

    
        /*  Split with too few output strings available */
        status = U_ZERO_ERROR;
        re = uregex_openC(":", 0, NULL, &status);
        uregex_setText(re, textToSplit, -1, &status);
        TEST_ASSERT_SUCCESS(status);

        /* The TEST_ASSERT_SUCCESS call above should change too... */
        if(U_SUCCESS(status)) {
            memset(fields, -1, sizeof(fields));
            numFields = 
                uregex_split(re, buf, sizeof(buf)/2, &requiredCapacity, fields, 2, &status);
            TEST_ASSERT_SUCCESS(status);

            /* The TEST_ASSERT_SUCCESS call above should change too... */
            if(U_SUCCESS(status)) {
                TEST_ASSERT(numFields == 2);
                TEST_ASSERT_STRING("first ",  fields[0], TRUE);
                TEST_ASSERT_STRING(" second:  third", fields[1], TRUE);
                TEST_ASSERT(!memcmp(&fields[2],&minus1,sizeof(UChar*)));

                spaceNeeded = u_strlen(textToSplit) -
                            (numFields - 1)  +  /* Field delimiters do not appear in output */
                            numFields;          /* Each field gets a NUL terminator */ 

                TEST_ASSERT(spaceNeeded == requiredCapacity);

                /* Split with a range of output buffer sizes.  */
                spaceNeeded = u_strlen(textToSplit) -
                    (numFields - 1)  +  /* Field delimiters do not appear in output */
                    numFields;          /* Each field gets a NUL terminator */ 
                        
                for (sz=0; sz < spaceNeeded+1; sz++) {
                    memset(fields, -1, sizeof(fields));
                    status = U_ZERO_ERROR;
                    numFields = 
                        uregex_split(re, buf, sz, &requiredCapacity, fields, 10, &status);
                    if (sz >= spaceNeeded) {
                        TEST_ASSERT_SUCCESS(status);
                        TEST_ASSERT_STRING("first ",  fields[0], TRUE);
                        TEST_ASSERT_STRING(" second", fields[1], TRUE);
                        TEST_ASSERT_STRING("  third", fields[2], TRUE);
                    } else {
                        TEST_ASSERT(status == U_BUFFER_OVERFLOW_ERROR);
                    }
                    TEST_ASSERT(numFields == 3);
                    TEST_ASSERT(fields[3] == NULL);
                    TEST_ASSERT(spaceNeeded == requiredCapacity);
                }
            }
        }

        uregex_close(re);
    }


    /* Split(), part 2.  Patterns with capture groups.  The capture group text
     *                   comes out as additional fields.  */
    {
        UChar    textToSplit[80];
        UChar    buf[200];
        UChar    *fields[10];
        int32_t  numFields;
        int32_t  requiredCapacity;
        int32_t  spaceNeeded;
        int32_t  sz;

        u_uastrncpy(textToSplit, "first <tag-a> second<tag-b>  third",  sizeof(textToSplit)/2);

        status = U_ZERO_ERROR;
        re = uregex_openC("<(.*?)>", 0, NULL, &status);

        uregex_setText(re, textToSplit, -1, &status);
        TEST_ASSERT_SUCCESS(status);

        /* The TEST_ASSERT_SUCCESS call above should change too... */
        if(U_SUCCESS(status)) {
            memset(fields, -1, sizeof(fields));
            numFields = 
                uregex_split(re, buf, sizeof(buf)/2, &requiredCapacity, fields, 10, &status);
            TEST_ASSERT_SUCCESS(status);

            /* The TEST_ASSERT_SUCCESS call above should change too... */
            if(U_SUCCESS(status)) {
                TEST_ASSERT(numFields == 5);
                TEST_ASSERT_STRING("first ",  fields[0], TRUE);
                TEST_ASSERT_STRING("tag-a",   fields[1], TRUE);
                TEST_ASSERT_STRING(" second", fields[2], TRUE);
                TEST_ASSERT_STRING("tag-b",   fields[3], TRUE);
                TEST_ASSERT_STRING("  third", fields[4], TRUE);
                TEST_ASSERT(fields[5] == NULL);
                spaceNeeded = strlen("first .tag-a. second.tag-b.  third.");  /* "." at NUL positions */
                TEST_ASSERT(spaceNeeded == requiredCapacity);
            }
        }
    
        /*  Split with too few output strings available (2) */
        status = U_ZERO_ERROR;
        memset(fields, -1, sizeof(fields));
        numFields = 
            uregex_split(re, buf, sizeof(buf)/2, &requiredCapacity, fields, 2, &status);
        TEST_ASSERT_SUCCESS(status);

        /* The TEST_ASSERT_SUCCESS call above should change too... */
        if(U_SUCCESS(status)) {
            TEST_ASSERT(numFields == 2);
            TEST_ASSERT_STRING("first ",  fields[0], TRUE);
            TEST_ASSERT_STRING(" second<tag-b>  third", fields[1], TRUE);
            TEST_ASSERT(!memcmp(&fields[2],&minus1,sizeof(UChar*)));

            spaceNeeded = strlen("first . second<tag-b>  third.");  /* "." at NUL positions */
            TEST_ASSERT(spaceNeeded == requiredCapacity);
        }

        /*  Split with too few output strings available (3) */
        status = U_ZERO_ERROR;
        memset(fields, -1, sizeof(fields));
        numFields = 
            uregex_split(re, buf, sizeof(buf)/2, &requiredCapacity, fields, 3, &status);
        TEST_ASSERT_SUCCESS(status);

        /* The TEST_ASSERT_SUCCESS call above should change too... */
        if(U_SUCCESS(status)) {
            TEST_ASSERT(numFields == 3);
            TEST_ASSERT_STRING("first ",  fields[0], TRUE);
            TEST_ASSERT_STRING("tag-a",   fields[1], TRUE);
            TEST_ASSERT_STRING(" second<tag-b>  third", fields[2], TRUE);
            TEST_ASSERT(!memcmp(&fields[3],&minus1,sizeof(UChar*)));

            spaceNeeded = strlen("first .tag-a. second<tag-b>  third.");  /* "." at NUL positions */
            TEST_ASSERT(spaceNeeded == requiredCapacity);
        }

        /*  Split with just enough output strings available (5) */
        status = U_ZERO_ERROR;
        memset(fields, -1, sizeof(fields));
        numFields = 
            uregex_split(re, buf, sizeof(buf)/2, &requiredCapacity, fields, 5, &status);
        TEST_ASSERT_SUCCESS(status);

        /* The TEST_ASSERT_SUCCESS call above should change too... */
        if(U_SUCCESS(status)) {
            TEST_ASSERT(numFields == 5);
            TEST_ASSERT_STRING("first ",  fields[0], TRUE);
            TEST_ASSERT_STRING("tag-a",   fields[1], TRUE);
            TEST_ASSERT_STRING(" second", fields[2], TRUE);
            TEST_ASSERT_STRING("tag-b",   fields[3], TRUE);
            TEST_ASSERT_STRING("  third", fields[4], TRUE);
            TEST_ASSERT(!memcmp(&fields[5],&minus1,sizeof(UChar*)));

            spaceNeeded = strlen("first .tag-a. second.tag-b.  third.");  /* "." at NUL positions */
            TEST_ASSERT(spaceNeeded == requiredCapacity);
        }

        /* Split, end of text is a field delimiter.   */
        status = U_ZERO_ERROR;
        sz = strlen("first <tag-a> second<tag-b>");
        uregex_setText(re, textToSplit, sz, &status);
        TEST_ASSERT_SUCCESS(status);

        /* The TEST_ASSERT_SUCCESS call above should change too... */
        if(U_SUCCESS(status)) {
            memset(fields, -1, sizeof(fields));
            numFields = 
                uregex_split(re, buf, sizeof(buf)/2, &requiredCapacity, fields, 9, &status);
            TEST_ASSERT_SUCCESS(status);

            /* The TEST_ASSERT_SUCCESS call above should change too... */
            if(U_SUCCESS(status)) {
                TEST_ASSERT(numFields == 4);
                TEST_ASSERT_STRING("first ",  fields[0], TRUE);
                TEST_ASSERT_STRING("tag-a",   fields[1], TRUE);
                TEST_ASSERT_STRING(" second", fields[2], TRUE);
                TEST_ASSERT_STRING("tag-b",   fields[3], TRUE);
                TEST_ASSERT(fields[4] == NULL);
                TEST_ASSERT(fields[8] == NULL);
                TEST_ASSERT(!memcmp(&fields[9],&minus1,sizeof(UChar*)));
                spaceNeeded = strlen("first .tag-a. second.tag-b.");  /* "." at NUL positions */
                TEST_ASSERT(spaceNeeded == requiredCapacity);
            }
        }

        uregex_close(re);
    }

    /*
     * set/getTimeLimit
     */
     TEST_SETUP("abc$", "abcdef", 0);
     TEST_ASSERT(uregex_getTimeLimit(re, &status) == 0);
     uregex_setTimeLimit(re, 1000, &status);
     TEST_ASSERT(uregex_getTimeLimit(re, &status) == 1000);
     TEST_ASSERT_SUCCESS(status);
     uregex_setTimeLimit(re, -1, &status);
     TEST_ASSERT(status == U_ILLEGAL_ARGUMENT_ERROR);
     status = U_ZERO_ERROR;
     TEST_ASSERT(uregex_getTimeLimit(re, &status) == 1000);
     TEST_TEARDOWN;

     /*
      * set/get Stack Limit
      */
     TEST_SETUP("abc$", "abcdef", 0);
     TEST_ASSERT(uregex_getStackLimit(re, &status) == 8000000);
     uregex_setStackLimit(re, 40000, &status);
     TEST_ASSERT(uregex_getStackLimit(re, &status) == 40000);
     TEST_ASSERT_SUCCESS(status);
     uregex_setStackLimit(re, -1, &status);
     TEST_ASSERT(status == U_ILLEGAL_ARGUMENT_ERROR);
     status = U_ZERO_ERROR;
     TEST_ASSERT(uregex_getStackLimit(re, &status) == 40000);
     TEST_TEARDOWN;
     
     
     /*
      * Get/Set callback functions
      *     This test is copied from intltest regex/Callbacks
      *     The pattern and test data will run long enough to cause the callback
      *       to be invoked.  The nested '+' operators give exponential time
      *       behavior with increasing string length.
      */
     TEST_SETUP("((.)+\\2)+x", "aaaaaaaaaaaaaaaaaaab", 0)
     callBackContext cbInfo = {4, 0, 0};
     const void     *pContext   = &cbInfo;
     URegexMatchCallback    *returnedFn = &TestCallbackFn;
     
     /*  Getting the callback fn when it hasn't been set must return NULL  */
     uregex_getMatchCallback(re, &returnedFn, &pContext, &status);
     TEST_ASSERT_SUCCESS(status);
     TEST_ASSERT(returnedFn == NULL);
     TEST_ASSERT(pContext == NULL);
     
     /* Set thecallback and do a match.                                   */
     /* The callback function should record that it has been called.      */
     uregex_setMatchCallback(re, &TestCallbackFn, &cbInfo, &status);
     TEST_ASSERT_SUCCESS(status);
     TEST_ASSERT(cbInfo.numCalls == 0);
     TEST_ASSERT(uregex_matches(re, -1, &status) == FALSE);
     TEST_ASSERT_SUCCESS(status);
     TEST_ASSERT(cbInfo.numCalls > 0);
     
     /* Getting the callback should return the values that were set above.  */
     uregex_getMatchCallback(re, &returnedFn, &pContext, &status);
     TEST_ASSERT(returnedFn == &TestCallbackFn);
     TEST_ASSERT(pContext == &cbInfo);

     TEST_TEARDOWN;
}


static void TestBug4315(void) {
    UErrorCode      theICUError = U_ZERO_ERROR;
    URegularExpression *theRegEx;
    UChar           *textBuff;
    const char      *thePattern;
    UChar            theString[100];
    UChar           *destFields[24];
    int32_t         neededLength1;
    int32_t         neededLength2;

    int32_t         wordCount = 0;
    int32_t         destFieldsSize = 24;

    thePattern  = "ck ";
    u_uastrcpy(theString, "The quick brown fox jumped over the slow black turtle.");

    /* open a regex */
    theRegEx = uregex_openC(thePattern, 0, NULL, &theICUError);
    TEST_ASSERT_SUCCESS(theICUError);

    /* set the input string */
    uregex_setText(theRegEx, theString, u_strlen(theString), &theICUError);
    TEST_ASSERT_SUCCESS(theICUError);

    /* split */
    /*explicitly pass NULL and 0 to force the overflow error -> this is where the
     *  error occurs! */
    wordCount = uregex_split(theRegEx, NULL, 0, &neededLength1, destFields,
        destFieldsSize, &theICUError);

    TEST_ASSERT(theICUError == U_BUFFER_OVERFLOW_ERROR);
    TEST_ASSERT(wordCount==3);

    if(theICUError == U_BUFFER_OVERFLOW_ERROR)
    {
        theICUError = U_ZERO_ERROR;
        textBuff = (UChar *) malloc(sizeof(UChar) * (neededLength1 + 1));
        wordCount = uregex_split(theRegEx, textBuff, neededLength1+1, &neededLength2,
            destFields, destFieldsSize, &theICUError);
        TEST_ASSERT(wordCount==3);
        TEST_ASSERT_SUCCESS(theICUError);
        TEST_ASSERT(neededLength1 == neededLength2);
        TEST_ASSERT_STRING("The qui", destFields[0], TRUE);
        TEST_ASSERT_STRING("brown fox jumped over the slow bla", destFields[1], TRUE);
        TEST_ASSERT_STRING("turtle.", destFields[2], TRUE);
        TEST_ASSERT(destFields[3] == NULL);
        free(textBuff);
    }
    uregex_close(theRegEx);
}

#endif   /*  !UCONFIG_NO_REGULAR_EXPRESSIONS */