_strlwr, _wcslwr, _mbslwr

Convert a string to lowercase.

char*_strlwr(char*string);

wchar_t*_wcslwr(wchar_t*string);

unsignedchar*_mbslwr(unsignedchar*string);

For additional compatibility information, see Compatibility in the Introduction.

Libraries

Return Value

Each of these functions returns a pointer to the converted string. Because the modification is done in place, the pointer returned is the same as the pointer passed as the input argument. No return value is reserved to indicate an error.

Parameter

string

Null-terminated string to convert to lowercase

Remarks

The _strlwr function converts any uppercase letters in string to lowercase as determined by the LC_CTYPE category setting of the current locale. Other characters are not affected. For more information on LC_CTYPE, see setlocale.

The _wcslwr and _mbslwr functions are wide-character and multibyte-character versions of _strlwr. The argument and return value of _wcslwr are wide-character strings; those of _mbslwr are multibyte-character strings. These three functions behave identically otherwise.

Generic-Text Routine Mappings

Example

/* STRLWR.C: This program uses _strlwr and _strupr to create
 * uppercase and lowercase copies of a mixed-case string.
 */

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

void main( void )
{
   char string[100] = "The String to End All Strings!";
   char *copy1, *copy2;
   copy1 = _strlwr( _strdup( string ) );
   copy2 = _strupr( _strdup( string ) );
   printf( "Mixed: %s\n", string );
   printf( "Lower: %s\n", copy1 );
   printf( "Upper: %s\n", copy2 );
}

Output

Mixed: The String to End All Strings!
Lower: the string to end all strings!
Upper: THE STRING TO END ALL STRINGS!

String Manipulation Routines |  Locale Routines

See Also   _strupr