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;
/a><a href='/guix/refs/?id=88ad26487165b4829089e44beeeb0aa125bf185b'>refs</a><a class='active' href='/guix/log/gnu/services/audio.scm'>log</a><a href='/guix/tree/gnu/services/audio.scm?id=88ad26487165b4829089e44beeeb0aa125bf185b'>tree</a><a href='/guix/commit/gnu/services/audio.scm?id=88ad26487165b4829089e44beeeb0aa125bf185b'>commit</a><a href='/guix/diff/gnu/services/audio.scm?id=88ad26487165b4829089e44beeeb0aa125bf185b'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/services/audio.scm'>
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<div class='path'>path: <a href='/guix/log/?id=88ad26487165b4829089e44beeeb0aa125bf185b'>root</a>/<a href='/guix/log/gnu?id=88ad26487165b4829089e44beeeb0aa125bf185b'>gnu</a>/<a href='/guix/log/gnu/services?id=88ad26487165b4829089e44beeeb0aa125bf185b'>services</a>/<a href='/guix/log/gnu/services/audio.scm?id=88ad26487165b4829089e44beeeb0aa125bf185b'>audio.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/gnu/services/audio.scm?id=88ad26487165b4829089e44beeeb0aa125bf185b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-12-06 23:18:08 +0100'>2020-12-06</span></td><td><a href='/guix/commit/gnu/services/audio.scm?id=ce3b5e5a8d8566162201cb778c4586f94a626dfa'>services: mpd: Make /var/run/mpd/USER user-owned.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/44820&gt;.
Reported by Simon &lt;lists@netpanic.org&gt;.

This is a followup to bb124f6e9c0af0a23736f233c2ea2c9c9b4a40a6.

* gnu/services/audio.scm (mpd-service-activation): Chown the parent of
DIRECTORY as well.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-11-06 23:10:18 +0100'>2020-11-06</span></td><td><a href='/guix/commit/gnu/services/audio.scm?id=bb124f6e9c0af0a23736f233c2ea2c9c9b4a40a6'>services: mpd: Fix daemon startup.</a><span class='msg-avail'>...<span class='msg-tooltip'>Until now it would wait for a PID file that'd never come.

* gnu/services/audio.scm (mpd-shepherd-service): Add 'requirement'.
Remove #:pid-file from 'start'.
(mpd-service-activation): Create the ".mpd" directory since that's what
the daemon expects.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-11-06 22:59:19 +0100'>2020-11-06</span></td><td><a href='/guix/commit/gnu/services/audio.scm?id=7209d7cbc37c108ca1148561a681258bb2222ab1'>services: mpd: Always create the "mpd" user account.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/audio.scm (%mpd-accounts): New variable.
(mpd-service-type)[extensions]: Add ACCOUNT-SERVICE-TYPE extension.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-11-06 08:54:27 -0500'>2020-11-06</span></td><td><a href='/guix/commit/gnu/services/audio.scm?id=0c5d0c57d370b34f3ba677838deaa8baf7bca58a'>services: mpd: Do not eagerly look for a user.</a><span class='msg-avail'>...<span class='msg-tooltip'>Running 'guix system search mpd' would throw a backtrace because the
mpd-shepherd-service service start Gexp contained an unquoted call to
'getpwnam', which would look for a missing 'mpd' user and fail.

* gnu/services/audio.scm (mpd-shepherd-service): gexp-unquote only the
relevant variable rather than the whole expression.
</span></span></td><td>Maxim Cournoyer</td></tr>