strw_midassign.c

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/* midw$ statement */

#include "fb.h"

FBCALL void fb_WstrAssignMid
        (
                FB_WCHAR *dst,
                ssize_t dst_len,
                ssize_t start,
                ssize_t len,
                const FB_WCHAR *src
        )
{
        ssize_t src_len;

    if( (dst == NULL) || (src == NULL) )
        return;

    src_len = fb_wstr_Len( src );
    if( src_len == 0 )
        return;

    if( dst_len == 0 )
    {
        /* it's a pointer, assume it's large enough */
        dst_len = fb_wstr_Len( dst ) + src_len;
    }

    if( (start > 0) && (start <= dst_len) )
    {
                --start;

        if( (len < 1) || (len > src_len) )
                        len = src_len;

        if( start + len > dst_len )
                len = (dst_len - start) - 1;

                /* without the null-term */
                fb_wstr_Move( &dst[start], src, len );
    }
}