You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
110 lines
4.9 KiB
HTML
110 lines
4.9 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- This file documents the BFD library.
|
|
|
|
Copyright (C) 1991-2019 Free Software Foundation, Inc.
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
|
any later version published by the Free Software Foundation; with the
|
|
Invariant Sections being "GNU General Public License" and "Funding
|
|
Free Software", the Front-Cover texts being (a) (see below), and with
|
|
the Back-Cover Texts being (b) (see below). A copy of the license is
|
|
included in the section entitled "GNU Free Documentation License".
|
|
|
|
(a) The FSF's Front-Cover Text is:
|
|
|
|
A GNU Manual
|
|
|
|
(b) The FSF's Back-Cover Text is:
|
|
|
|
You have freedom to copy and modify this GNU Manual, like GNU
|
|
software. Copies published by the Free Software Foundation raise
|
|
funds for GNU development. -->
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>Looking Up or Entering a String (Untitled Document)</title>
|
|
|
|
<meta name="description" content="Looking Up or Entering a String (Untitled Document)">
|
|
<meta name="keywords" content="Looking Up or Entering a String (Untitled Document)">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<link href="index.html#Top" rel="start" title="Top">
|
|
<link href="BFD-Index.html#BFD-Index" rel="index" title="BFD Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="Hash-Tables.html#Hash-Tables" rel="up" title="Hash Tables">
|
|
<link href="Traversing-a-Hash-Table.html#Traversing-a-Hash-Table" rel="next" title="Traversing a Hash Table">
|
|
<link href="Creating-and-Freeing-a-Hash-Table.html#Creating-and-Freeing-a-Hash-Table" rel="prev" title="Creating and Freeing a Hash Table">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
div.smalllisp {margin-left: 3.2em}
|
|
kbd {font-style: oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
|
pre.smallexample {font-size: smaller}
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
|
pre.smalllisp {font-size: smaller}
|
|
span.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<a name="Looking-Up-or-Entering-a-String"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Traversing-a-Hash-Table.html#Traversing-a-Hash-Table" accesskey="n" rel="next">Traversing a Hash Table</a>, Previous: <a href="Creating-and-Freeing-a-Hash-Table.html#Creating-and-Freeing-a-Hash-Table" accesskey="p" rel="prev">Creating and Freeing a Hash Table</a>, Up: <a href="Hash-Tables.html#Hash-Tables" accesskey="u" rel="up">Hash Tables</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-Index" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
<hr>
|
|
<a name="Looking-up-or-entering-a-string"></a>
|
|
<h4 class="subsection">2.18.2 Looking up or entering a string</h4>
|
|
<a name="index-bfd_005fhash_005flookup"></a>
|
|
<p>The function <code>bfd_hash_lookup</code> is used both to look up a
|
|
string in the hash table and to create a new entry.
|
|
</p>
|
|
<p>If the <var>create</var> argument is <code>FALSE</code>, <code>bfd_hash_lookup</code>
|
|
will look up a string. If the string is found, it will
|
|
returns a pointer to a <code>struct bfd_hash_entry</code>. If the
|
|
string is not found in the table <code>bfd_hash_lookup</code> will
|
|
return <code>NULL</code>. You should not modify any of the fields in
|
|
the returns <code>struct bfd_hash_entry</code>.
|
|
</p>
|
|
<p>If the <var>create</var> argument is <code>TRUE</code>, the string will be
|
|
entered into the hash table if it is not already there.
|
|
Either way a pointer to a <code>struct bfd_hash_entry</code> will be
|
|
returned, either to the existing structure or to a newly
|
|
created one. In this case, a <code>NULL</code> return means that an
|
|
error occurred.
|
|
</p>
|
|
<p>If the <var>create</var> argument is <code>TRUE</code>, and a new entry is
|
|
created, the <var>copy</var> argument is used to decide whether to
|
|
copy the string onto the hash table objalloc or not. If
|
|
<var>copy</var> is passed as <code>FALSE</code>, you must be careful not to
|
|
deallocate or modify the string as long as the hash table
|
|
exists.
|
|
</p>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|