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<HTML><HEAD><TITLE>Tcl Library Procedures - Tcl_Concat manual page</TITLE></HEAD><BODY>
<H3><A NAME="M2">NAME</A></H3>
Tcl_Concat - concatenate a collection of strings
<H3><A NAME="M3">SYNOPSIS</A></H3>
<B>#include &lt;tcl.h&gt;</B><BR>
char *<BR>
<B>Tcl_Concat</B>(<I>argc, argv</I>)<BR>
<H3><A NAME="M4">ARGUMENTS</A></H3>
<DL>
<P><DT>int <B>argc</B> (in)<DD>
Number of strings.
<P><DT>char <B>*argv[]</B> (in)<DD>
Array of strings to concatenate.  Must have <I>argc</I> entries.
<P></DL>
<H3><A NAME="M5">DESCRIPTION</A></H3>
<B>Tcl_Concat</B> is a utility procedure used by several of the
Tcl commands.  Given a collection of strings, it concatenates
them together into a single string, with the original strings
separated by spaces.  This procedure behaves differently than
<B><A HREF="../TclLib/SplitList.htm">Tcl_Merge</A></B>, in that the arguments are simply concatenated:
no effort is made to ensure proper list structure.
However, in most common usage the arguments will all be proper
lists themselves;  if this is true, then the result will also have
proper list structure.
<P>
<B>Tcl_Concat</B> eliminates leading and trailing white space as it
copies strings from <B>argv</B> to the result.  If an element of
<B>argv</B> consists of nothing but white space, then that string
is ignored entirely.  This white-space removal was added to make
the output of the <B><A HREF="../TclCmd/concat.htm">concat</A></B> command cleaner-looking.
<P>
The result string is dynamically allocated
using <B><A HREF="../TclLib/Alloc.htm">Tcl_Alloc</A></B>;  the caller must eventually release the space
by calling <B><A HREF="../TclLib/Alloc.htm">Tcl_Free</A></B>.
<H3><A NAME="M6">SEE ALSO</A></H3>
<B>Tcl_ConcatObj</B>
<H3><A NAME="M7">KEYWORDS</A></H3>
<A href="../Keywords/C.htm#concatenate">concatenate</A>, <A href="../Keywords/S.htm#strings">strings</A>
<HR><PRE>
<A HREF="../copyright.htm">Copyright</A> &#169; 1989-1993 The Regents of the University of California.
<A HREF="../copyright.htm">Copyright</A> &#169; 1994-1996 Sun Microsystems, Inc.
<A HREF="../copyright.htm">Copyright</A> &#169; 1995-1997 Roger E. Critchlow Jr.</PRE>
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