* Copyright (c) 2026 Huawei Device Co., Ltd.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <string.h>
#include <wchar.h>
#include "test.h"
* @tc.name : wcsrchr_0100
* @tc.desc : Character at beginning of string
* @tc.level : Level 0
*/
void wcsrchr_0100(void)
{
wchar_t *ch = L"hello, world";
wchar_t *result = wcsrchr(ch, L'h');
if (result != ch) {
t_error("%s wcsrchr get result is %p, not %p (expected 'h' at start)\n",
__func__, (void*)result, (void*)ch);
}
}
* @tc.name : wcsrchr_0200
* @tc.desc : Character at end of string
* @tc.level : Level 0
*/
void wcsrchr_0200(void)
{
wchar_t *ch = L"hello, world";
wchar_t *result = wcsrchr(ch, L'd');
wchar_t *expected = ch + wcslen(ch) - 1;
if (result != expected) {
t_error("%s wcsrchr get result is %p, not %p (expected 'd' at end)\n",
__func__, (void*)result, (void*)expected);
}
}
* @tc.name : wcsrchr_0300
* @tc.desc : Character in middle, multiple occurrences
* @tc.level : Level 0
*/
void wcsrchr_0300(void)
{
wchar_t *ch = L"hello, world";
wchar_t *result = wcsrchr(ch, L'l');
wchar_t *expected = ch + 10;
if (result != expected) {
t_error("%s wcsrchr get result is %p, not %p (expected last 'l')\n",
__func__, (void*)result, (void*)expected);
}
}
* @tc.name : wcsrchr_0400
* @tc.desc : Character not found, should return NULL
* @tc.level : Level 0
*/
void wcsrchr_0400(void)
{
wchar_t *ch = L"hello, world";
wchar_t *result = wcsrchr(ch, L'x');
if (result != NULL) {
t_error("%s wcsrchr get result is %p, not NULL (character not found)\n",
__func__, (void*)result);
}
}
* @tc.name : wcsrchr_0500
* @tc.desc : Search for null terminator
* @tc.level : Level 1
*/
void wcsrchr_0500(void)
{
wchar_t *ch = L"hello";
wchar_t *result = wcsrchr(ch, L'\0');
wchar_t *expected = ch + wcslen(ch);
if (result != expected) {
t_error("%s wcsrchr get result is %p, not %p (expected null terminator)\n",
__func__, (void*)result, (void*)expected);
}
}
* @tc.name : wcsrchr_0600
* @tc.desc : Empty string, search for any character
* @tc.level : Level 1
*/
void wcsrchr_0600(void)
{
wchar_t *ch = L"";
wchar_t *result = wcsrchr(ch, L'a');
if (result != NULL) {
t_error("%s wcsrchr get result is %p, not NULL (empty string)\n",
__func__, (void*)result);
}
}
* @tc.name : wcsrchr_0700
* @tc.desc : Empty string, search for null terminator
* @tc.level : Level 1
*/
void wcsrchr_0700(void)
{
wchar_t *ch = L"";
wchar_t *result = wcsrchr(ch, L'\0');
if (result != ch) {
t_error("%s wcsrchr get result is %p, not %p (empty string null terminator)\n",
__func__, (void*)result, (void*)ch);
}
}
* @tc.name : wcsrchr_0800
* @tc.desc : Unicode character search
* @tc.level : Level 1
*/
void wcsrchr_0800(void)
{
wchar_t *ch = L"中文测试中文";
wchar_t *result = wcsrchr(ch, L'文');
wchar_t *expected = ch + 3;
if (result != expected) {
t_error("%s wcsrchr get result is %p, not %p (expected last Unicode char)\n",
__func__, (void*)result, (void*)expected);
}
}
* @tc.name : wcsrchr_0900
* @tc.desc : Search for control character
* @tc.level : Level 1
*/
void wcsrchr_0900(void)
{
wchar_t ch[] = L"hello\nworld\t";
wchar_t *result = wcsrchr(ch, L'\n');
wchar_t *expected = ch + 5;
if (result != expected) {
t_error("%s wcsrchr get result is %p, not %p (expected newline)\n",
__func__, (void*)result, (void*)expected);
}
}
* @tc.name : wcsrchr_1000
* @tc.desc : Single character string, search matches
* @tc.level : Level 1
*/
void wcsrchr_1000(void)
{
wchar_t *ch = L"a";
wchar_t *result = wcsrchr(ch, L'a');
if (result != ch) {
t_error("%s wcsrchr get result is %p, not %p (single char match)\n",
__func__, (void*)result, (void*)ch);
}
}
* @tc.name : wcsrchr_1100
* @tc.desc : Single character string, search doesn't match
* @tc.level : Level 1
*/
void wcsrchr_1100(void)
{
wchar_t *ch = L"a";
wchar_t *result = wcsrchr(ch, L'b');
if (result != NULL) {
t_error("%s wcsrchr get result is %p, not NULL (single char no match)\n",
__func__, (void*)result);
}
}
* @tc.name : wcsrchr_1200
* @tc.desc : Compare with wcschr (forward search)
* @tc.level : Level 2
*/
void wcsrchr_1200(void)
{
wchar_t ch[] = L"multiple l characters";
wchar_t *forward = wcschr(ch, L'l');
wchar_t *backward = wcsrchr(ch, L'l');
if (forward == backward) {
t_error("%s wcschr (%p) should not equal wcsrchr (%p) for multiple occurrences\n",
__func__, (void*)forward, (void*)backward);
}
if (forward != ch + 2) {
t_error("%s wcschr get result is %p, not %p\n",
__func__, (void*)forward, (void*)(ch + 2));
}
if (backward != ch + 20) {
t_error("%s wcsrchr get result is %p, not %p\n",
__func__, (void*)backward, (void*)(ch + 20));
}
}
* @tc.name : wcsrchr_1300
* @tc.desc : String with embedded null characters
* @tc.level : Level 2
*/
void wcsrchr_1300(void)
{
wchar_t ch[] = L"ab\0cd\0ef";
wchar_t *result = wcsrchr(ch, L'c');
if (result != NULL) {
t_error("%s wcsrchr get result is %p, not NULL (string with embedded null)\n",
__func__, (void*)result);
}
}
* @tc.name : wcsrchr_1400
* @tc.desc : Search for character equal to 0 (null)
* @tc.level : Level 1
*/
void wcsrchr_1400(void)
{
wchar_t *ch = L"hello";
wchar_t zero = 0;
wchar_t *result = wcsrchr(ch, zero);
wchar_t *expected = ch + wcslen(ch);
if (result != expected) {
t_error("%s wcsrchr get result is %p, not %p (search for zero)\n",
__func__, (void*)result, (void*)expected);
}
}
* @tc.name : wcsrchr_1500
* @tc.desc : Verify backward search from end
* @tc.level : Level 2
*/
void wcsrchr_1500(void)
{
wchar_t ch[] = L"aabbcc";
wchar_t *result1 = wcsrchr(ch, L'a');
if (result1 != ch + 1) {
t_error("%s wcsrchr for 'a' get result is %p, not %p\n",
__func__, (void*)result1, (void*)(ch + 1));
}
wchar_t *result2 = wcsrchr(ch, L'b');
if (result2 != ch + 3) {
t_error("%s wcsrchr for 'b' get result is %p, not %p\n",
__func__, (void*)result2, (void*)(ch + 3));
}
}
* @tc.name : wcsrchr_1600
* @tc.desc : Maximum wchar_t value search
* @tc.level : Level 2
*/
void wcsrchr_1600(void)
{
wchar_t max_char = (wchar_t)-1;
wchar_t ch[] = {L'a', max_char, L'b', L'\0'};
wchar_t *result = wcsrchr(ch, max_char);
if (result != ch + 1) {
t_error("%s wcsrchr get result is %p, not %p (max wchar_t)\n",
__func__, (void*)result, (void*)(ch + 1));
}
}
* @tc.name : wcsrchr_1700
* @tc.desc : Very long string
* @tc.level : Level 2
*/
void wcsrchr_1700(void)
{
wchar_t long_str[1000];
for (int i = 0; i < 999; i++) {
long_str[i] = L'A' + (i % 26);
}
long_str[999] = L'\0';
long_str[998] = L'Z';
long_str[500] = L'Z';
wchar_t *result = wcsrchr(long_str, L'Z');
wchar_t *expected = long_str + 998;
if (result != expected) {
t_error("%s wcsrchr get result is %p, not %p (long string)\n",
__func__, (void*)result, (void*)expected);
}
}
* @tc.name : wcsrchr_1800
* @tc.desc : Verify wcslen is used for initialization
* @tc.level : Level 2
*/
void wcsrchr_1800(void)
{
wchar_t ch[] = L"test";
wchar_t *start = ch;
wchar_t *end = ch + wcslen(ch);
wchar_t *result = wcsrchr(ch, L't');
wchar_t *expected = ch + 3;
if (result != expected) {
t_error("%s wcsrchr get result is %p, not %p (verify wcslen usage)\n",
__func__, (void*)result, (void*)expected);
}
}
* @tc.name : wcsrchr_1900
* @tc.desc : Character appears only once
* @tc.level : Level 1
*/
void wcsrchr_1900(void)
{
wchar_t *ch = L"unique";
wchar_t *result = wcsrchr(ch, L'u');
if (result != ch) {
t_error("%s wcsrchr get result is %p, not %p (single occurrence)\n",
__func__, (void*)result, (void*)ch);
}
}
int main(int argc, char *argv[])
{
wcsrchr_0100();
wcsrchr_0200();
wcsrchr_0300();
wcsrchr_0400();
wcsrchr_0500();
wcsrchr_0600();
wcsrchr_0700();
wcsrchr_0800();
wcsrchr_0900();
wcsrchr_1000();
wcsrchr_1100();
wcsrchr_1200();
wcsrchr_1300();
wcsrchr_1400();
return t_status;
}