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_strrev, _wcsrev, _mbsrev

Visual Studio .NET 2003

Reverse characters of a string.

char *_strrev(
   char *string 
);
wchar_t *_wcsrev(
   wchar_t *string 
);
unsigned char *_mbsrev(
   unsigned char *string 
);

Parameter

string: Null-terminated string to reverse.

Return Value

Returns a pointer to the altered string. No return value is reserved to indicate an error.

Remarks

The _strrev function reverses the order of the characters in string. The terminating null character remains in place. _wcsrev and _mbsrev are wide-character and multibyte-character versions of _strrev. The arguments and return value of _wcsrev are wide-character strings; those of _mbsrev are multibyte-character strings. For _mbsrev, the order of bytes in each multibyte character in string is not changed. These three functions behave identically otherwise.

Security Note These functions incur a potential threat brought about by a buffer overrun problem. Buffer overrun problems are a frequent method of system attack, resulting in an unwarranted elevation of privilege. For more information, see Avoiding Buffer Overruns.

Generic-Text Routine Mappings

TCHAR.H routine	_UNICODE & _MBCS not defined	_MBCS defined	_UNICODE defined
_tcsrev	_strrev	_mbsrev	_wcsrev

Requirements

Routine	Required header	Compatibility
_strrev	<string.h>	Win 98, Win Me, Win NT, Win 2000, Win XP
_wcsrev	<string.h> or <wchar.h>	Win 98, Win Me, Win NT, Win 2000, Win XP
_mbsrev	<mbstring.h>	Win 98, Win Me, Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

Example

// crt_strrev.c
/* This program checks a string to see
 * whether it is a palindrome: that is, whether
 * it reads the same forward and backward.
 */

#include <string.h>
#include <stdio.h>

int main( void )
{
   char* string = "Able was I ere I saw Elba";
   int result;

   /* Reverse string and compare (ignore case): */
   result = _stricmp( string, _strrev( _strdup( string ) ) );
   if( result == 0 )
      printf( "The string \"%s\" is a palindrome\n", string );
   else
      printf( "The string \"%s\" is not a palindrome\n", string );
}

Output

The string "Able was I ere I saw Elba" is a palindrome