### wcscspn -- Find Offset of First Wide-Character Match

Format

>     #include <wcstr.h>
>     size_t wcscspn(const wchar_t *string1, const wchar_t *string2);

Language Level: XPG4
wcscspn determines the number of wchar_t characters in the initial segment of the string pointed to by string1 that do not appear in the string pointed to by string2.

wcscspn operates on null-terminated wchar_t strings; string arguments to this function should contain a wchar_t null character marking the end of the string.

Return Value
wcscspn returns the number of wchar_t characters in the segment.

Example
This example uses wcscspn to find the first occurrence of any of the characters a, x, l, or e in string.

    #include <stdio.h>
    #include <wcstr.h>

    #define SIZE    40

    int main(void)
    {
      wchar_t string[ SIZE ] = L"This is the source string";
      wchar_t * substring = L"axle";

      printf( "The first %i characters in the string \"%ls\" are not in the "
              "string \"%ls\" \n", wcscspn( string, substring),
              string, substring );
      return 0;

      /****************************************************************************
         The output should be:

         The first 10 characters in the string "This is the source string" are
         not in the string "axle"
      ****************************************************************************/
    }

strcspn -- Compare Strings for Substrings
strspn -- Search Strings
wcsspn -- Search Wide-Character Strings
wcswcs -- Locate Wide-Character Substring
wcscat -- Concatenate Wide-Character Strings
wcschr -- Search for Wide Character
wcscmp -- Compare Wide-Character Strings
wcscpy -- Copy Wide-Character Strings
wcslen -- Calculate Length of Wide-Character String
<wcstr.h>