[librsvg] Export rsvg_xml_space_normalize() from Rust to C

[Federico Mena Quintero <federico src gnome org>]

commit 62a7689d17976e7aabcb5560422252d9713f39fa
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Dec 7 11:00:09 2017 -0600

    Export rsvg_xml_space_normalize() from Rust to C

 rsvg-text.c       |    9 +++++++++
 rust/src/lib.rs   |    4 ++++
 rust/src/space.rs |   11 +++++++++++
 3 files changed, 24 insertions(+), 0 deletions(-)
---
diff --git a/rsvg-text.c b/rsvg-text.c
index e0d56c9..1186a87 100644
--- a/rsvg-text.c
+++ b/rsvg-text.c
@@ -36,6 +36,15 @@
 /* what we use for text rendering depends on what cairo has to offer */
 #include <pango/pangocairo.h>
 
+/* Keep in sync with rust/src/space.rs:XmlSpace */
+typedef enum {
+    XML_SPACE_DEFAULT,
+    XML_SPACE_PRESERVE
+} XmlSpace;
+
+/* Implemented in rust/src/space.rs */
+extern char *rsvg_xml_space_normalize (XmlSpace mode, const char *s);
+
 typedef struct _RsvgNodeText RsvgNodeText;
 
 struct _RsvgNodeText {
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index e39726e..f3cd46e 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -117,6 +117,10 @@ pub use shapes::{
     rsvg_node_rect_new,
 };
 
+pub use space::{
+    rsvg_xml_space_normalize,
+};
+
 pub use stop::{
     rsvg_node_stop_new
 };
diff --git a/rust/src/space.rs b/rust/src/space.rs
index 56f7d2e..f1e5c1c 100644
--- a/rust/src/space.rs
+++ b/rust/src/space.rs
@@ -1,3 +1,7 @@
+use libc;
+use glib::translate::*;
+
+#[repr(C)]
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub enum XmlSpace {
     Default,
@@ -82,6 +86,13 @@ fn normalize_preserve(s: &str) -> String {
         .collect()
 }
 
+#[no_mangle]
+pub extern fn rsvg_xml_space_normalize(mode: XmlSpace, s: *const libc::c_char) -> *const libc::c_char {
+    let rs = unsafe { String::from_glib_none (s) };
+
+    xml_space_normalize(mode, &rs).to_glib_full()
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;