strw_concatassign.c

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/* string concat and assign (s = s + expr) function */

#include "fb.h"

FBCALL FB_WCHAR *fb_WstrConcatAssign( FB_WCHAR *dst, ssize_t dst_chars, const FB_WCHAR *src )
{
        ssize_t src_len, dst_len;

        /* NULL? */
        if( (dst == NULL) || (src == NULL) )
                return dst;

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

        dst_len = fb_wstr_Len( dst );

        /* don't check ptr's */
        if( dst_chars > 0 )
        {
                --dst_chars;                                                    /* less the null-term */

                if( src_len > dst_chars - dst_len )
                        src_len = dst_chars - dst_len;
        }

        /* copy the null-term too */
        fb_wstr_Move( &dst[dst_len], src, src_len + 1 );

        return dst;
}