strw_instr.c

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/* instrw function */

#include "fb.h"

FBCALL ssize_t fb_WstrInstr( ssize_t start, const FB_WCHAR *src, const FB_WCHAR *patt )
{
        ssize_t r;
        FB_WCHAR *p;

        if( (src == NULL) || (patt == NULL) )
                return 0;

        if( (start > 0) && (start <= fb_wstr_Len( src )) && (fb_wstr_Len( patt ) != 0 ))
        {
                p = fb_wstr_Instr( &src[start-1], patt );
                if( p != NULL )
                        r = fb_wstr_CalcDiff( src, p ) + 1;
                else
                        r = 0;
        }
        else
                r = 0;

        return r;
}