From ae9d65b8a3f4a35bc01c8225f226e6420dfebe48 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@operamail.com>
Date: Sun, 30 Nov 2014 09:33:52 +0100
Subject: mds-kbdc: add support for empty files
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Signed-off-by: Mattias Andrée <maandree@operamail.com>
---
 src/mds-kbdc/make-tree.c                                 | 8 ++++++++
 src/mds-kbdc/mds-kbdc.c                                  | 5 +++--
 src/mds-kbdc/raw-data.c                                  | 3 ++-
 test-files/mds-kbdc/make-tree/valid/empty_file           | 5 +++++
 test-files/mds-kbdc/make-tree/valid/perfectly_empty_file | 0
 5 files changed, 18 insertions(+), 3 deletions(-)
 create mode 100644 test-files/mds-kbdc/make-tree/valid/empty_file
 create mode 100644 test-files/mds-kbdc/make-tree/valid/perfectly_empty_file

diff --git a/src/mds-kbdc/make-tree.c b/src/mds-kbdc/make-tree.c
index cdfae40..fab402b 100644
--- a/src/mds-kbdc/make-tree.c
+++ b/src/mds-kbdc/make-tree.c
@@ -1027,6 +1027,14 @@ int parse_to_tree(const char* restrict filename, mds_kbdc_parsed_t* restrict res
 	}
     }
   
+  /* Warn about empty files. */
+  if (result->tree == NULL)
+    {
+      char* line = NULL;
+      char* end = NULL;
+      NEW_ERROR(0, WARNING, "file is empty");
+    }
+  
   free(keyword_stack);
   free(tree_stack);
   return 0;
diff --git a/src/mds-kbdc/mds-kbdc.c b/src/mds-kbdc/mds-kbdc.c
index a2b5b70..318fc3c 100644
--- a/src/mds-kbdc/mds-kbdc.c
+++ b/src/mds-kbdc/mds-kbdc.c
@@ -20,6 +20,7 @@
 #include "globals.h"
 #include "make-tree.h"
 #include "simplify-tree.h"
+#include "process-includes.h"
 
 #include <libmdsserver/macros.h>
 
@@ -52,8 +53,8 @@ int main(int argc_, char** argv_)
   
   mds_kbdc_parsed_initialise(&result);
   process (parse_to_tree(argv[1], &result));
-  //process (simplify_tree(&result));
-  //process (process_includes(&result));
+  process (simplify_tree(&result));
+  process (process_includes(&result));
   /* TODO process (validate_tree(&result)); */
   /* TODO process (eliminate_dead_code(&result)); */
   /* TODO process (compile_layout(&result)); */
diff --git a/src/mds-kbdc/raw-data.c b/src/mds-kbdc/raw-data.c
index a1f8ec3..b0985fe 100644
--- a/src/mds-kbdc/raw-data.c
+++ b/src/mds-kbdc/raw-data.c
@@ -115,7 +115,8 @@ static char* read_file(const char* restrict pathname, size_t* restrict size)
     }
   
   /* Shrink the buffer so it is not excessively large. */
-  fail_if (xxrealloc(old, content, buf_ptr, char));
+  if (buf_ptr) /* Simplest way to handle empty files: let the have the initial allocation size.  */
+    fail_if (xxrealloc(old, content, buf_ptr, char));
   
   /* Close file decriptor for the file. */
   close(fd);
diff --git a/test-files/mds-kbdc/make-tree/valid/empty_file b/test-files/mds-kbdc/make-tree/valid/empty_file
new file mode 100644
index 0000000..e3fe2c3
--- /dev/null
+++ b/test-files/mds-kbdc/make-tree/valid/empty_file
@@ -0,0 +1,5 @@
+# prefectly_empty_file should yeild the same error message.
+
+# : warning: file is empty
+# 
+
diff --git a/test-files/mds-kbdc/make-tree/valid/perfectly_empty_file b/test-files/mds-kbdc/make-tree/valid/perfectly_empty_file
new file mode 100644
index 0000000..e69de29
-- 
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