strrchr, wcsrchr, _mbsrchr, _mbsrchr_l

Artigo
06/05/2017

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The latest version of this topic can be found at strrchr, wcsrchr, _mbsrchr, _mbsrchr_l.

Scans a string for the last occurrence of a character.

Important

_mbsrchr and _mbsrchr_l cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported with /ZW.

Syntax

char *strrchr(  
   const char *str,  
   int c   
); // C only  
char *strrchr(  
   char *str,  
   int c   
); // C++ only  
const char *strrchr(  
   const char *str,  
   int c   
); // C++ only  
wchar_t *wcsrchr(  
   const wchar_t *str,  
   wchar_t c   
); // C only  
wchar_t *wcsrchr(  
   wchar_t *str,  
   wchar_t c   
); // C++ only  
const wchar_t *wcsrchr(  
   const wchar_t *str,  
   wchar_t c   
); // C++ only  
unsigned char *_mbsrchr(  
   const unsigned char *str,  
   unsigned int c   
); // C only  
unsigned char *_mbsrchr(  
   unsigned char *str,  
   unsigned int c   
); // C++ only  
const unsigned char *_mbsrchr(  
   const unsigned char *str,  
   unsigned int c   
); // C++ only  
unsigned char *_mbsrchr_l(  
   const unsigned char *str,  
   unsigned int c,  
   _locale_t locale  
); // C only  
unsigned char *_mbsrchr_l(  
   unsigned char *str,  
   unsigned int c,  
   _locale_t locale  
); // C++ only  
const unsigned char *_mbsrchr_l(  
   const unsigned char *str,  
   unsigned int c,  
   _locale_t locale  
); // C++ only

Parameters

str
Null-terminated string to search.

c
Character to be located.

locale
Locale to use.

Return Value

Returns a pointer to the last occurrence of c in str, or NULL if c is not found.

Remarks

The strrchr function finds the last occurrence of c (converted to char) in str. The search includes the terminating null character.

wcsrchr and _mbsrchr are wide-character and multibyte-character versions of strrchr. The arguments and return value of wcsrchr are wide-character strings; those of _mbsrchr are multibyte-character strings.

In C, these functions take a const pointer for the first argument. In C++, two overloads are available. The overload taking a pointer to const returns a pointer to const; the version that takes a pointer to non-const returns a pointer to non-const. The macro _CONST_CORRECT_OVERLOADS is defined if both the const and non-const versions of these functions are available. If you require the non-const behavior for both C++ overloads, define the symbol _CONST_RETURN.

_mbsrchr validates its parameters. If str is NULL, the invalid parameter handler is invoked, as described in Parameter Validation. If execution is allowed to continue, errno is set to EINVAL and _mbsrchr returns 0. strrchr and wcsrchr do not validate their parameters. These three functions behave identically otherwise.

The output value is affected by the setting of the LC_CTYPE category setting of the locale; for more information, see setlocale. The versions of these functions without the _l suffix use the current locale for this locale-dependent behavior; the versions with the _l suffix are identical except that they use the locale parameter passed in instead. For more information, see Locale.

Generic-Text Routine Mappings

TCHAR.H routine	_UNICODE & _MBCS not defined	_MBCS defined	_UNICODE defined
`_tcsrchr`	`strrchr`	`_mbsrchr`	`wcsrchr`
n/a	n/a	`_mbsrchr_l`	n/a

Requirements

Routine	Required header
`strrchr`	<string.h>
`wcsrchr`	<string.h> or <wchar.h>
`_mbsrchr`, `_mbsrchr_l`	<mbstring.h>

For more information about compatibility, see Compatibility.

Example

For an example of using strrchr, see strchr.

.NET Framework Equivalent

System::String::LastIndexOf

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