Put library version in XML string

The context's library version is something that is not going to change
over time, and therefore it should be present in the XML representation
of the context.

Signed-off-by: Paul Cercueil <[email protected]>

context.c

@@ -24,7 +24,8 @@ static const char xml_header[] = "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
 "<!ELEMENT scan-element EMPTY>"
 "<!ELEMENT debug-attribute EMPTY>"
 "<!ELEMENT buffer-attribute EMPTY>"
-"<!ATTLIST context name CDATA #REQUIRED description CDATA #IMPLIED>"
+"<!ATTLIST context name CDATA #REQUIRED version-major CDATA #REQUIRED "
+"version-minor CDATA #REQUIRED version-git CDATA #REQUIRED description CDATA #IMPLIED>"
 "<!ATTLIST context-attribute name CDATA #REQUIRED value CDATA #REQUIRED>"
 "<!ATTLIST device id CDATA #REQUIRED name CDATA #IMPLIED label CDATA #IMPLIED>"
 "<!ATTLIST channel id CDATA #REQUIRED type (input|output) #REQUIRED name CDATA #IMPLIED>"
@@ -100,10 +101,17 @@ static ssize_t iio_snprintf_context_xml(char *ptr, ssize_t len,
 					const struct iio_context *ctx)
 {
 	ssize_t ret, alen = 0;
-	unsigned int i;
+	unsigned int i, major, minor;
+	char git_tag[64];
+
+	ret = iio_context_get_version(ctx, &major, &minor, git_tag);
+	if (ret < 0)
+		return ret;
 
-	ret = iio_snprintf(ptr, len, "%s<context name=\"%s\" ",
-			   xml_header, ctx->name);
+	ret = iio_snprintf(ptr, len,
+			   "%s<context name=\"%s\" version-major=\"%u\" "
+			   "version-minor=\"%u\" version-git=\"%s\" ",
+			   xml_header, ctx->name, major, minor, git_tag);
 	if (ret < 0)
 		return ret;