export factions, too

give this a header and some flags so we can choose in detail what to
export.

src/export.c

@@ -1,13 +1,20 @@
+#include <util/bool.h>
+#include <util/base36.h>
 #include <platform.h>
+
+#include "export.h"
+
 #include <kernel/types.h>
 #include <kernel/region.h>
+#include <kernel/faction.h>
 #include <kernel/terrain.h>
 #include <stream.h>
 #include "cJSON.h"
 
-void export_json(stream * out) {
-    region * r;
+void export_json(stream * out, unsigned int flags) {
     cJSON *json, *root = cJSON_CreateObject();
+    if (flags & EXPORT_REGIONS) {
+        region * r;
         cJSON_AddItemToObject(root, "regions", json = cJSON_CreateObject());
         for (r = regions; r; r = r->next) {
             char id[32];
@@ -18,7 +25,19 @@ void export_json(stream * out) {
             cJSON_AddNumberToObject(data, "y", r->y);
             cJSON_AddStringToObject(data, "type", r->terrain->_name);
         }
-    if (out) {
+    }
+    if (flags & EXPORT_FACTIONS) {
+        faction *f;
+        cJSON_AddItemToObject(root, "factions", json = cJSON_CreateObject());
+        for (f = factions; f; f = f->next) {
+            cJSON *data;
+            cJSON_AddItemToObject(json, itoa36(f->no), data = cJSON_CreateObject());
+            cJSON_AddStringToObject(data, "name", f->name);
+            cJSON_AddStringToObject(data, "email", f->email);
+            cJSON_AddNumberToObject(data, "score", f->score);
+        }
+    }
+    if (flags) {
         char *tok, *output;
         output = cJSON_Print(json);
         tok = strtok(output, "\n\r");
@@ -30,4 +49,5 @@ void export_json(stream * out) {
         }
         free(output);
     }
+    cJSON_Delete(root);
 }

src/export.h

@@ -0,0 +1,12 @@
+#pragma once
+#ifndef ERESSEA_EXPORT_H
+#define ERESSEA_EXPORT_H
+
+#define EXPORT_REGIONS  1<<0
+#define EXPORT_FACTIONS 1<<1
+#define EXPORT_UNITS    1<<2
+
+struct stream;
+void export_json(struct stream * out, unsigned int flags);
+
+#endif

src/kernel/region.h

@@ -22,6 +22,7 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 extern "C" {
 #endif
 
+#include <stddef.h>
 #include "types.h"
 
 /* FAST_CONNECT: regions are directly connected to neighbours, saves doing