wcsstr

wcsstr

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Searches a wide string for a replica of another wide string

 #include <wchar.h> wchar_t *wcsstr ( const wchar_t *s1 , const wchar_t *s2  ); 

The wcsstr( ) function searches the wide string addressed by s1 for the sequence of wide characters contained in s2, not counting the terminating null wide character. The return value is a pointer to the first wide character in the first occurrence in s1 of the sequence contained in s2, or a null pointer if there is no such occurrence. If s2 points to an empty wide string, then wcsstr( ) returns the value of its first argument, s1.

Example

This simple program prints each line in a file that contains a given keyword:

 #define MAX_LINE 1024 int main( int argc, char **argv ) {   FILE *fpIn = NULL;   wchar_t keyword[MAX_LINE] = { L'\0' };   wchar_t line[MAX_LINE] = { L'\0' };   if ( argc != 3 )   {     wprintf( L"Syntax: %s <keyword> <filename>\n", argv[0] );     return -1;   }   if (( fpIn = fopen( argv[2], "r" )) == NULL )     return -2;   else     fwide( fpIn, 1 );   if ( mbstowcs( keyword, argv[1], MAX_LINE ) == -1 )     return -3;   int count = 0;   while ( fgetws( line, MAX_LINE, fpIn ) != NULL )     if ( wcsstr( line, keyword ) != NULL )       {         ++count;         fputws( line, stdout );       }   if ( !feof( fpIn ))     return -4;   else     return count; } 

See Also

wcspbrk( ), wcsspn( ), wcscspn( ), wcschr( ), wcsrchr( ), strstr( ), strpbrk( ), strspn( ), strcspn( ), strchr( ), strrchr( )