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<body class="article">
<div id="header">
<h1>string-list API</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>The string_list API offers a data structure and functions to handle
sorted and unsorted string lists. A "sorted" list is one whose
entries are sorted by string value in <code>strcmp()</code> order.</p></div>
<div class="paragraph"><p>The <em>string_list</em> struct used to be called <em>path_list</em>, but was renamed
because it is not specific to paths.</p></div>
<div class="paragraph"><p>The caller:</p></div>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
Allocates and clears a <code>struct string_list</code> variable.
</p>
</li>
<li>
<p>
Initializes the members. You might want to set the flag <code>strdup_strings</code>
if the strings should be strdup()ed. For example, this is necessary
when you add something like git_path("…"), since that function returns
a static buffer that will change with the next call to git_path().
</p>
<div class="paragraph"><p>If you need something advanced, you can manually malloc() the <code>items</code>
member (you need this if you add things later) and you should set the
<code>nr</code> and <code>alloc</code> members in that case, too.</p></div>
</li>
<li>
<p>
Adds new items to the list, using <code>string_list_append</code>,
<code>string_list_append_nodup</code>, <code>string_list_insert</code>,
<code>string_list_split</code>, and/or <code>string_list_split_in_place</code>.
</p>
</li>
<li>
<p>
Can check if a string is in the list using <code>string_list_has_string</code> or
<code>unsorted_string_list_has_string</code> and get it from the list using
<code>string_list_lookup</code> for sorted lists.
</p>
</li>
<li>
<p>
Can sort an unsorted list using <code>sort_string_list</code>.
</p>
</li>
<li>
<p>
Can remove duplicate items from a sorted list using
<code>string_list_remove_duplicates</code>.
</p>
</li>
<li>
<p>
Can remove individual items of an unsorted list using
<code>unsorted_string_list_delete_item</code>.
</p>
</li>
<li>
<p>
Can remove items not matching a criterion from a sorted or unsorted
list using <code>filter_string_list</code>, or remove empty strings using
<code>string_list_remove_empty_items</code>.
</p>
</li>
<li>
<p>
Finally it should free the list using <code>string_list_clear</code>.
</p>
</li>
</ol></div>
<div class="paragraph"><p>Example:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>struct string_list list = STRING_LIST_INIT_NODUP;
int i;
string_list_append(&list, "foo");
string_list_append(&list, "bar");
for (i = 0; i < list.nr; i++)
printf("%s\n", list.items[i].string)</code></pre>
</div></div>
<div class="admonitionblock">
<table><tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">It is more efficient to build an unsorted list and sort it
afterwards, instead of building a sorted list (<code>O(n log n)</code> instead of
<code>O(n^2)</code>).</td>
</tr></table>
</div>
<div class="paragraph"><p>+
However, if you use the list to check if a certain string was added
already, you should not do that (using unsorted_string_list_has_string()),
because the complexity would be quadratic again (but with a worse factor).</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_functions">Functions</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
General ones (works with sorted and unsorted lists as well)
</p>
<div class="dlist"><dl>
<dt class="hdlist1">
<code>filter_string_list</code>
</dt>
<dd>
<p>
Apply a function to each item in a list, retaining only the
items for which the function returns true. If free_util is
true, call free() on the util members of any items that have
to be deleted. Preserve the order of the items that are
retained.
</p>
</dd>
<dt class="hdlist1">
<code>string_list_remove_empty_items</code>
</dt>
<dd>
<p>
Remove any empty strings from the list. If free_util is true,
call free() on the util members of any items that have to be
deleted. Preserve the order of the items that are retained.
</p>
</dd>
<dt class="hdlist1">
<code>print_string_list</code>
</dt>
<dd>
<p>
Dump a string_list to stdout, useful mainly for debugging purposes. It
can take an optional header argument and it writes out the
string-pointer pairs of the string_list, each one in its own line.
</p>
</dd>
<dt class="hdlist1">
<code>string_list_clear</code>
</dt>
<dd>
<p>
Free a string_list. The <code>string</code> pointer of the items will be freed in
case the <code>strdup_strings</code> member of the string_list is set. The second
parameter controls if the <code>util</code> pointer of the items should be freed
or not.
</p>
</dd>
</dl></div>
</li>
<li>
<p>
Functions for sorted lists only
</p>
<div class="dlist"><dl>
<dt class="hdlist1">
<code>string_list_has_string</code>
</dt>
<dd>
<p>
Determine if the string_list has a given string or not.
</p>
</dd>
<dt class="hdlist1">
<code>string_list_insert</code>
</dt>
<dd>
<p>
Insert a new element to the string_list. The returned pointer can be
handy if you want to write something to the <code>util</code> pointer of the
string_list_item containing the just added string. If the given
string already exists the insertion will be skipped and the
pointer to the existing item returned.
</p>
<div class="paragraph"><p>Since this function uses xrealloc() (which die()s if it fails) if the
list needs to grow, it is safe not to check the pointer. I.e. you may
write <code>string_list_insert(...)->util = ...;</code>.</p></div>
</dd>
<dt class="hdlist1">
<code>string_list_lookup</code>
</dt>
<dd>
<p>
Look up a given string in the string_list, returning the containing
string_list_item. If the string is not found, NULL is returned.
</p>
</dd>
<dt class="hdlist1">
<code>string_list_remove_duplicates</code>
</dt>
<dd>
<p>
Remove all but the first of consecutive entries that have the
same string value. If free_util is true, call free() on the
util members of any items that have to be deleted.
</p>
</dd>
</dl></div>
</li>
<li>
<p>
Functions for unsorted lists only
</p>
<div class="dlist"><dl>
<dt class="hdlist1">
<code>string_list_append</code>
</dt>
<dd>
<p>
Append a new string to the end of the string_list. If
<code>strdup_string</code> is set, then the string argument is copied;
otherwise the new <code>string_list_entry</code> refers to the input
string.
</p>
</dd>
<dt class="hdlist1">
<code>string_list_append_nodup</code>
</dt>
<dd>
<p>
Append a new string to the end of the string_list. The new
<code>string_list_entry</code> always refers to the input string, even if
<code>strdup_string</code> is set. This function can be used to hand
ownership of a malloc()ed string to a <code>string_list</code> that has
<code>strdup_string</code> set.
</p>
</dd>
<dt class="hdlist1">
<code>sort_string_list</code>
</dt>
<dd>
<p>
Sort the list’s entries by string value in <code>strcmp()</code> order.
</p>
</dd>
<dt class="hdlist1">
<code>unsorted_string_list_has_string</code>
</dt>
<dd>
<p>
It’s like <code>string_list_has_string()</code> but for unsorted lists.
</p>
</dd>
<dt class="hdlist1">
<code>unsorted_string_list_lookup</code>
</dt>
<dd>
<p>
It’s like <code>string_list_lookup()</code> but for unsorted lists.
</p>
<div class="paragraph"><p>The above two functions need to look through all items, as opposed to their
counterpart for sorted lists, which performs a binary search.</p></div>
</dd>
<dt class="hdlist1">
<code>unsorted_string_list_delete_item</code>
</dt>
<dd>
<p>
Remove an item from a string_list. The <code>string</code> pointer of the items
will be freed in case the <code>strdup_strings</code> member of the string_list
is set. The third parameter controls if the <code>util</code> pointer of the
items should be freed or not.
</p>
</dd>
<dt class="hdlist1">
<code>string_list_split</code>
</dt>
<dt class="hdlist1">
<code>string_list_split_in_place</code>
</dt>
<dd>
<p>
Split a string into substrings on a delimiter character and
append the substrings to a <code>string_list</code>. If <code>maxsplit</code> is
non-negative, then split at most <code>maxsplit</code> times. Return the
number of substrings appended to the list.
</p>
<div class="paragraph"><p><code>string_list_split</code> requires a <code>string_list</code> that has <code>strdup_strings</code>
set to true; it leaves the input string untouched and makes copies of
the substrings in newly-allocated memory.
<code>string_list_split_in_place</code> requires a <code>string_list</code> that has
<code>strdup_strings</code> set to false; it splits the input string in place,
overwriting the delimiter characters with NULs and creating new
string_list_items that point into the original string (the original
string must therefore not be modified or freed while the <code>string_list</code>
is in use).</p></div>
</dd>
</dl></div>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_data_structures">Data structures</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
<code>struct string_list_item</code>
</p>
</li>
</ul></div>
<div class="paragraph"><p>Represents an item of the list. The <code>string</code> member is a pointer to the
string, and you may use the <code>util</code> member for any purpose, if you want.</p></div>
<div class="ulist"><ul>
<li>
<p>
<code>struct string_list</code>
</p>
</li>
</ul></div>
<div class="paragraph"><p>Represents the list itself.</p></div>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
The array of items are available via the <code>items</code> member.
</p>
</li>
<li>
<p>
The <code>nr</code> member contains the number of items stored in the list.
</p>
</li>
<li>
<p>
The <code>alloc</code> member is used to avoid reallocating at every insertion.
You should not tamper with it.
</p>
</li>
<li>
<p>
Setting the <code>strdup_strings</code> member to 1 will strdup() the strings
before adding them, see above.
</p>
</li>
</ol></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated 2013-06-10 20:01:55 UTC
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