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wcsrchr

From cppreference.com
< c‎ | string‎ | wide
Defined in header <wchar.h>
wchar_t *wcsrchr( const wchar_t *str, wchar_t ch );
(1) (since C95)
/*QWchar_t*/ *wcsrchr( /*QWchar_t*/ *str, wchar_t ch );
(2) (since C23)
1) Finds the last occurrence of the wide character ch in the wide string pointed to by str.
2) Type-generic function equivalent to (1). Let T be an unqualified wide character object type.
  • If str is of type const T*, the return type is const wchar_t*.
  • Otherwise, if str is of type T*, the return type is wchar_t*.
  • Otherwise, the behavior is undefined.
If a macro definition of each of these generic functions is suppressed to access an actual function (e.g. if (wcsrchr) or a function pointer is used), the actual function declaration (1) becomes visible.

Contents

[edit] Parameters

str - pointer to the null-terminated wide string to be analyzed
ch - wide character to search for

[edit] Return value

Pointer to the found character in str, or a null pointer if no such character is found.

[edit] Example

#include <locale.h>
#include <stdio.h>
#include <wchar.h>
 
int main(void)
{
    wchar_t arr[] = L"白猫 黒猫 кошки";
    wchar_t *cat = wcsrchr(arr, L'猫');
    wchar_t *dog = wcsrchr(arr, L'犬');
 
    setlocale(LC_ALL, "en_US.utf8");
 
    cat ? printf("The character 猫 found at position %td\n", cat - arr)
        : puts("The character 猫 not found");
 
    dog ? printf("The character 犬 found at position %td\n", dog - arr)
        : puts("The character 犬 not found");
}

Output:

The character 猫 found at position 4
The character 犬 not found

[edit] References

  • C23 standard (ISO/IEC 9899:2023):
  • 7.31.4.6.4 The wcsrchr function (p: TBD)
  • C17 standard (ISO/IEC 9899:2018):
  • 7.29.4.5.4 The wcsrchr function (p: 318)
  • C11 standard (ISO/IEC 9899:2011):
  • 7.29.4.5.4 The wcsrchr function (p: 436)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.24.4.5.4 The wcsrchr function (p: 382)

[edit] See also

(C95)
finds the first occurrence of a wide character in a wide string
(function) [edit]
finds the first location of any wide character in one wide string, in another wide string
(function) [edit]
C++ documentation for wcsrchr