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36 lines
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<TITLE>CLHS: Section 19.2.2.5</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="19_bbdg.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="19_bb.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="19_bc.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<H2>
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19.2.2.5 Restrictions on Constructing Pathnames</H2> <P>
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When constructing a <A REL=DEFINITION HREF="26_glo_p.htm#pathname"><I>pathname</I></A> from components, conforming programs must follow these rules: <P>
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<P><DL><P>
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<DT>* Any component can be <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A>. <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A> in the host might mean a default host rather than an actual <A REL=DEFINITION HREF="a_nil.htm#nil"><B>nil</B></A> in some implementations. <P><DD>
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<DT>* The host, device, directory, name, and type can be <A REL=DEFINITION HREF="26_glo_s.htm#string"><I>strings</I></A>. There are <A REL=DEFINITION HREF="26_glo_i.htm#implementation-dependent"><I>implementation-dependent</I></A> limits on the number and type of <A REL=DEFINITION HREF="26_glo_c.htm#character"><I>characters</I></A> in these <A REL=DEFINITION HREF="26_glo_s.htm#string"><I>strings</I></A>. <P><DD>
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<DT>* The directory can be a <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A> of <A REL=DEFINITION HREF="26_glo_s.htm#string"><I>strings</I></A> and <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbols</I></A>. There are <A REL=DEFINITION HREF="26_glo_i.htm#implementation-dependent"><I>implementation-dependent</I></A> limits on the <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A>'s length and contents. <P><DD>
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<DT>* The version can be <TT>:newest</TT>. <P><DD>
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<DT>* Any component can be taken from the corresponding component of another <A REL=DEFINITION HREF="26_glo_p.htm#pathname"><I>pathname</I></A>. When the two <A REL=DEFINITION HREF="26_glo_p.htm#pathname"><I>pathnames</I></A> are for different file systems (in implementations that support multiple file systems), an appropriate translation occurs. If no meaningful translation is possible, an error is signaled. The definitions of ``appropriate'' and ``meaningful'' are <A REL=DEFINITION HREF="26_glo_i.htm#implementation-dependent"><I>implementation-dependent</I></A>. <P><DD>
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<DT>* An implementation might support other values for some components, but a portable program cannot use those values. A conforming program can use <A REL=DEFINITION HREF="26_glo_i.htm#implementation-dependent"><I>implementation-dependent</I></A> values but this can make it non-portable; for example, it might work only with Unix file systems. <P><DD></DL><P>
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