Format
#include <wchar.h>
int wcsncmp(const wchar_t *string1, const wchar_t *string2, size_t count);Language Level: XPG4
Threadsafe: Yes.
Wide Character Function: See Wide Characters for more information.
Description
The wcsncmp() function compares up to count wide characters in string1 to string2.
The wcsncmp() function operates on null-ended wide-character strings; string arguments to this function should contain a wchar_t null character marking the end of the string.
Return Value
The wcsncmp() function returns a value indicating the relationship between the two strings, as follows:
Example that uses wcsncmp()
This example demonstrates the difference between the wcscmp() function, which compares the entire strings, and the wcsncmp() function, which compares only a specified number of wide characters in the strings.
#include <stdio.h>
#include <wchar.h>
#define SIZE 10
int main(void)
{
int result;
int index = 3;
wchar_t buffer1[SIZE] = L"abcdefg";
wchar_t buffer2[SIZE] = L"abcfg";
void print_result( int, wchar_t *, wchar_t * );
result = wcscmp( buffer1, buffer2 );
printf( "Comparison of each character\n" );
printf( " wcscmp: " );
print_result( result, buffer1, buffer2 );
result = wcsncmp( buffer1, buffer2, index);
printf( "\nComparison of only the first %i characters\n", index );
printf( " wcsncmp: " );
print_result( result, buffer1, buffer2 );
}
void print_result( int res, wchar_t * p_buffer1, wchar_t * p_buffer2 )
{
if ( res == 0 )
printf( "\"%ls\" is identical to \"%ls\"\n", p_buffer1, p_buffer2);
else if ( res < 0 )
printf( "\"%ls\" is less than \"%ls\"\n", p_buffer1, p_buffer2 );
else
printf( "\"%ls\" is greater than \"%ls\"\n", p_buffer1, p_buffer2 );
}
/**************** Output should be similar to: ******************
Comparison of each character
wcscmp: "abcdefg" is less than "abcfg"
Comparison of only the first 3 characters
wcsncmp: "abcdefg" is identical to "abcfg"
*/Related Information