[PATCH] Suppress XML preamble in CSV export

[Sergey Starosek]

To obey <xsl:output omit-xml-declaration="yes"/> element
one should rely on libxslt to do its job instead of writing
document himself.

Discussion on this subject can be found at
http://comments.gmane.org/gmane.comp.gnome.lib.xslt/3839

Signed-off-by: Sergey Starosek <sergey.starosek at gmail.com>
---
 dive.h     |  1 +
 save-xml.c | 18 ++++++++++--------
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/dive.h b/dive.h
index 4978f4f..70d6f53 100644
--- a/dive.h
+++ b/dive.h
@@ -36,6 +36,7 @@ static inline char *copy_string(const char *s)
 
 #include <libxml/tree.h>
 #include <libxslt/transform.h>
+#include <libxslt/xsltutils.h>
 
 #include "sha1.h"
 #include "units.h"
diff --git a/save-xml.c b/save-xml.c
index 0a76753..20714c3 100644
--- a/save-xml.c
+++ b/save-xml.c
@@ -618,18 +618,20 @@ int export_dives_xslt(const char *filename, const bool selected, const char *exp
 		return report_error("Failed to open export conversion stylesheet");
 
 	transformed = xsltApplyStylesheet(xslt, doc, NULL);
-	xsltFreeStylesheet(xslt);
 	xmlFreeDoc(doc);
 
 	/* Write the transformed export to file */
 	f = subsurface_fopen(filename, "w");
-	if (!f)
-		return report_error("Failed to open %s for writing (%s)", filename, strerror(errno));
-
-	xmlDocFormatDump(f, transformed, 1);
+	int res = 0;
+	if (f) {
+		xsltSaveResultToFile(f, transformed, xslt);
+		fclose(f);
+		/* Check write errors? */
+	} else {
+		res = report_error("Failed to open %s for writing (%s)", filename, strerror(errno));
+	}
+	xsltFreeStylesheet(xslt);
 	xmlFreeDoc(transformed);
 
-	fclose(f);
-	/* Check write errors? */
-	return 0;
+	return res;
 }
-- 
1.8.5.5