wmemchr
From cppreference.com
| Defined in header <wchar.h>
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| wchar_t *wmemchr( const wchar_t *ptr, wchar_t ch, size_t count ); |
(1) | (since C95) |
| /*QWchar_t*/ *wmemchr( /*Qwchar_t*/ *ptr, wchar_t ch, size_t count ); |
(2) | (since C23) |
1) Locates the first occurrence of wide character ch in the initial count wide characters of the wide character array or integer array of compatible type, pointed to by ptr.
2) Type-generic function equivalent to (1). Let
T be an unqualified wide character object type.
- If
ptris of type const T*, the return type is const wchar_t*. - Otherwise, if
ptris of type T*, the return type is wchar_t*. - Otherwise, the behavior is undefined.
- If
If count is zero, the function returns a null pointer.
Parameters
| ptr | - | pointer to the wide character array to be examined |
| ch | - | wide character to search for |
| count | - | number of wide characters to examine |
Return value
Pointer to the location of the wide character, or a null pointer if no such character is found.
Example
Run this code
#include <locale.h> #include <stdio.h> #include <wchar.h> int main(void) { wchar_t str[] = L"诺不轻信，故人不负我\0诺不轻许，故我不负人。"; size_t sz = sizeof str / sizeof *str; wchar_t target = L'许'; wchar_t* result = wmemchr(str, target, sz); if (result) { setlocale(LC_ALL, "en_US.utf8"); printf("Found '%lc' at position %td\n",target, result - str); } }
Possible output:
Found '许' at position 14
References
- C23 standard (ISO/IEC 9899:2023):
- 7.29.4.5.8 The wmemchr function (p: TBD)
- C17 standard (ISO/IEC 9899:2018):
- 7.29.4.5.8 The wmemchr function (p: TBD)
- C11 standard (ISO/IEC 9899:2011):
- 7.29.4.5.8 The wmemchr function (p: 438)
- C99 standard (ISO/IEC 9899:1999):
- 7.24.4.5.8 The wmemchr function (p: 384)
See also
| searches an array for the first occurrence of a character (function) | |
| (C95) |
finds the first occurrence of a wide character in a wide string (function) |