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83 lines
3.8 KiB
HTML
83 lines
3.8 KiB
HTML
15 years ago
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<head>
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<title>Looking Up or Entering a String - Untitled</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Untitled">
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<meta name="generator" content="makeinfo 4.7">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Hash-Tables.html#Hash-Tables" title="Hash Tables">
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<link rel="prev" href="Creating-and-Freeing-a-Hash-Table.html#Creating-and-Freeing-a-Hash-Table" title="Creating and Freeing a Hash Table">
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<link rel="next" href="Traversing-a-Hash-Table.html#Traversing-a-Hash-Table" title="Traversing a Hash Table">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the BFD library.
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Copyright (C) 1991, 2000, 2001, 2003, 2006, 2007 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.1 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``GNU General Public License'' and ``Funding
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Free Software'', the Front-Cover texts being (a) (see below), and with
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the Back-Cover Texts being (b) (see below). A copy of the license is
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included in the section entitled ``GNU Free Documentation License''.
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development.-->
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<style type="text/css"><!--
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span.roman { font-family: serif; font-weight: normal; }
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--></style>
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</head>
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<body>
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<div class="node">
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<p>
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<a name="Looking-Up-or-Entering-a-String"></a>Next: <a rel="next" accesskey="n" href="Traversing-a-Hash-Table.html#Traversing-a-Hash-Table">Traversing a Hash Table</a>,
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Previous: <a rel="previous" accesskey="p" href="Creating-and-Freeing-a-Hash-Table.html#Creating-and-Freeing-a-Hash-Table">Creating and Freeing a Hash Table</a>,
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Up: <a rel="up" accesskey="u" href="Hash-Tables.html#Hash-Tables">Hash Tables</a>
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<hr><br>
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</div>
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<h4 class="subsection">2.18.2 Looking up or entering a string</h4>
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<p><a name="index-bfd_005fhash_005flookup-1388"></a>The function <code>bfd_hash_lookup</code> is used both to look up a
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string in the hash table and to create a new entry.
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<p>If the <var>create</var> argument is <code>FALSE</code>, <code>bfd_hash_lookup</code>
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will look up a string. If the string is found, it will
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returns a pointer to a <code>struct bfd_hash_entry</code>. If the
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string is not found in the table <code>bfd_hash_lookup</code> will
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return <code>NULL</code>. You should not modify any of the fields in
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the returns <code>struct bfd_hash_entry</code>.
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<p>If the <var>create</var> argument is <code>TRUE</code>, the string will be
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entered into the hash table if it is not already there.
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Either way a pointer to a <code>struct bfd_hash_entry</code> will be
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returned, either to the existing structure or to a newly
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created one. In this case, a <code>NULL</code> return means that an
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error occurred.
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<p>If the <var>create</var> argument is <code>TRUE</code>, and a new entry is
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created, the <var>copy</var> argument is used to decide whether to
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copy the string onto the hash table objalloc or not. If
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<var>copy</var> is passed as <code>FALSE</code>, you must be careful not to
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deallocate or modify the string as long as the hash table
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exists.
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</body></html>
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