Borrowed from Debian.

--- swish-e-2.4.7/src/parser.c	2009-04-05 03:58:32.000000000 +0200
+++ swish-e-2.4.7/src/parser.c	2013-06-11 13:53:08.196559035 +0200
@@ -1760,7 +1760,7 @@
     va_start(args, msg);
     vsnprintf(str, 1000, msg, args );
     va_end(args);
-    xmlParserError(parse_data->ctxt, str);
+    xmlParserError(parse_data->ctxt, "%s", str);
 }
 
 static void warning(void *data, const char *msg, ...)
@@ -1772,7 +1772,7 @@
     va_start(args, msg);
     vsnprintf(str, 1000, msg, args );
     va_end(args);
-    xmlParserWarning(parse_data->ctxt, str);
+    xmlParserWarning(parse_data->ctxt, "%s", str);
 }
 
 
--- swish-e-2.4.7/src/result_output.c	2009-04-05 03:58:32.000000000 +0200
+++ swish-e-2.4.7/src/result_output.c	2013-06-11 13:53:38.593550825 +0200
@@ -752,7 +752,7 @@
             s = (char *) emalloc(MAXWORDLEN + 1);
             n = strftime(s, (size_t) MAXWORDLEN, fmt, localtime(&(pv->value.v_date)));
             if (n && f)
-                fprintf(f, s);
+                fprintf(f, "%s", s);
             efree(s);
         }
         break;
ef='/guix/refs/?id=8e4d1493f1d56e29252eb7a36b3eee2a0e073ee4'>refs</a><a class='active' href='/guix/log/tests/channels.scm'>log</a><a href='/guix/tree/tests/channels.scm?id=8e4d1493f1d56e29252eb7a36b3eee2a0e073ee4'>tree</a><a href='/guix/commit/tests/channels.scm?id=8e4d1493f1d56e29252eb7a36b3eee2a0e073ee4'>commit</a><a href='/guix/diff/tests/channels.scm?id=8e4d1493f1d56e29252eb7a36b3eee2a0e073ee4'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/channels.scm'>
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<div class='path'>path: <a href='/guix/log/?id=8e4d1493f1d56e29252eb7a36b3eee2a0e073ee4'>root</a>/<a href='/guix/log/tests?id=8e4d1493f1d56e29252eb7a36b3eee2a0e073ee4'>tests</a>/<a href='/guix/log/tests/channels.scm?id=8e4d1493f1d56e29252eb7a36b3eee2a0e073ee4'>channels.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/channels.scm?id=8e4d1493f1d56e29252eb7a36b3eee2a0e073ee4&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-09-23 10:38:44 +0200'>2019-09-23</span></td><td><a href='/guix/commit/tests/channels.scm?id=9719e8d37aaa63e1c8f9d4ab1e28d49e2e56d85b'>channels: Allow news entries to refer to a tag.</a><span class='msg-avail'>...<span class='msg-tooltip'>Suggested by Ricardo Wurmus &lt;rekado@elephly.net&gt;.

* guix/channels.scm (&lt;channel-news-entry&gt;)[tag]: New field.
(sexp-&gt;channel-news-entry): Accept either 'commit' or 'tag' in 'entry'
forms.
(resolve-channel-news-entry-tag): New procedure.
(channel-news-for-commit): Move 'with-repository' form one level
higher.  Call 'resolve-channel-news-entry-tag' on all the news entries.
* guix/tests/git.scm (populate-git-repository): Add clause for 'tag'.
* tests/channels.scm ("channel-news, one entry"): Create a tag and add
an entry with a tag.  Check that the tag is resolved and also visible in
the &lt;channel-news-entry&gt; record.
* doc/guix.texi (Channels): Mention tags in news entries.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-09-23 10:38:44 +0200'>2019-09-23</span></td><td><a href='/guix/commit/tests/channels.scm?id=8ba7fd3cd6962f1c1aaaa5f71eed7f9222094f25'>channels: Add support for a news file.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/channels.scm (&lt;channel-metadata&gt;)[news-file]: New field.
(read-channel-metadata): Set the 'news-file' field.
(read-channel-metadata-from-source): Likewise.
(&lt;channel-news&gt;, &lt;channel-news-entry&gt;): New record types.
(sexp-&gt;channel-news-entry, read-channel-news)
(channel-news-for-commit): New procedures.
* guix/tests/git.scm (populate-git-repository): For 'add', allow
CONTENTS to be a procedure.
* tests/channels.scm ("channel-news, no news")
("channel-news, one entry"): New tests.
* doc/guix.texi (Channels): Document it.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-07-19 11:53:47 +0200'>2019-07-19</span></td><td><a href='/guix/commit/tests/channels.scm?id=ce5d9ec875156f3de7479e861731edf48c984c16'>channels: Always provide a &lt;channel-metadata&gt; record.</a><span class='msg-avail'>...<span class='msg-tooltip'>This simplifies the code since one no longer needs to think about
whether '.guix-channel' was present.

* guix/channels.scm (read-channel-metadata): Always pass a string as the
first argument to 'channel-metadata'.
(read-channel-metadata-from-source): Always return a &lt;channel-metadata&gt;
record.
(channel-instance-dependencies): Remove now unneeded 'match'.
(standard-module-derivation): Assume DIRECTORY is never #f and contains
a leading slash.
* tests/channels.scm (channel-metadata-directory)
(channel-metadata-dependencies): New procedures.
("channel-instance-metadata returns #f if .guix-channel does not
exist"): Remove.
("channel-instance-metadata returns default if .guix-channel does not
exist"): New test.
(make-instance): Use 'write' instead of 'display' when creating
'.guix-channel'.
(instance--no-deps): Remove dependencies.
(instance--sub-directory): New variable.
("channel-instance-metadata and default dependencies")
("channel-instance-metadata and directory"): New tests.
("latest-channel-instances excludes duplicate channel dependencies"):
Expect 'channel-commit' to return a string and adjust accordingly.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-07-19 11:53:47 +0200'>2019-07-19</span></td><td><a href='/guix/commit/tests/channels.scm?id=45b903323e0fecb7947926d2c14103d47fea624a'>channels: Strictly check the version of '.guix-channel'.</a><span class='msg-avail'>...<span class='msg-tooltip'>Until now the 'version' field in '.guix-channel' could be omitted, or it
could be any value.

* guix/channels.scm (read-channel-metadata): Rename to...
(channel-instance-metadata): ... this.
(channel-instance-dependencies): Adjust accordingly.
(read-channel-metadata): New procedure.  Use 'match'
to require a 'version' field.  Provide proper error handling when the
channel sexp is malformed or when given an unsupported version number.
(read-channel-metadata-from-source): Use 'catch' and
'system-error-errno' instead of 'file-exists?'.
* tests/channels.scm (instance--unsupported-version): New variable.
(read-channel-metadata): Rename to...
(channel-instance-metadata): ... this.  Rename tests accordingly.
("channel-instance-metadata rejects unsupported version"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>