/usr/share/doc/isomaster/bkisofs/x674.html

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><A
NAME="AEN674"
>Casting</A
></H1
><P
>You can cast any <CODE
CLASS="CLASSNAME"
>BkFileBase</CODE
> to a more elaborate structure. First you use the macros from the previous section to find out what type the <CODE
CLASS="CLASSNAME"
>BkFileBase</CODE
> is and then you use the macros in this section to cast them.</P
><DIV
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><H2
CLASS="SECT2"
><A
NAME="AEN679"
><TT
CLASS="FUNCTION"
>BK_DIR_PTR()</TT
></A
></H2
><P
>Use this macro when you have a <CODE
CLASS="CLASSNAME"
>BkFileBase*</CODE
> that you're sure (having checked with <TT
CLASS="FUNCTION"
>IS_DIR()</TT
>) is a directory.</P
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><PRE
CLASS="PROGRAMLISTING"
>void printName(BkFileBase* base)
{
    if(IS_DIR(base-&#62;posixFileMode))
    {
        /* print name of the directory */
        printf("directory %s\n", base-&#62;name);
        
        /* print all the directory's children */
        BkFileBase* child = BK_DIR_PTR(base)-&#62;children;
        while(child != NULL)
        {
            printName(child);
            child = child-&#62;next;
        }
    }
}</PRE
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><H2
CLASS="SECT2"
><A
NAME="AEN687"
><TT
CLASS="FUNCTION"
>BK_FILE_PTR()</TT
></A
></H2
><P
>Use this macro when you have a <CODE
CLASS="CLASSNAME"
>BkFileBase*</CODE
> that you're sure (having checked with <TT
CLASS="FUNCTION"
>IS_REG_FILE()</TT
>) is a regular file.</P
><P
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><PRE
CLASS="PROGRAMLISTING"
>void printName(BkFileBase* base)
{
    if(IS_REG_FILE(base-&#62;posixFileMode))
    {
        /* print name and size of the file */
        printf("regular file %s, size %u\n", base-&#62;name, BK_FILE_PTR(base)-&#62;size);
    }
}</PRE
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><H2
CLASS="SECT2"
><A
NAME="AEN695"
><TT
CLASS="FUNCTION"
>BK_SYMLINK_PTR()</TT
></A
></H2
><P
>Use this macro when you have a <CODE
CLASS="CLASSNAME"
>BkFileBase*</CODE
> that you're sure (having checked with <TT
CLASS="FUNCTION"
>IS_SYMLINK()</TT
>) is a symbolic link.</P
><P
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><PRE
CLASS="PROGRAMLISTING"
>void printName(BkFileBase* base)
{
    if(IS_SYMLINK(base-&#62;posixFileMode))
    {
        /* print name and target of the symbolic link */
        printf("symbolic link %s -&#62; %s\n", base-&#62;name, BK_SYMLINK_PTR(base)-&#62;target);
    }
}</PRE
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><H2
CLASS="SECT2"
><A
NAME="AEN703"
><TT
CLASS="FUNCTION"
>BK_BASE_PTR()</TT
></A
></H2
><P
>Sometimes you may have a <CODE
CLASS="CLASSNAME"
>BkDir*</CODE
> or a <CODE
CLASS="CLASSNAME"
>BkFile*</CODE
> or a <CODE
CLASS="CLASSNAME"
>BkSymLink*</CODE
> and would like to use the <CODE
CLASS="CLASSNAME"
>BkFileBase*</CODE
> part of it. That's what this macro is for.</P
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><TD
><PRE
CLASS="PROGRAMLISTING"
>void printDirName(BkDir* dir)
{
    printf("%s\n", BK_FILE_BASE(dir)-&#62;name);
}</PRE
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