1 files changed, 63 insertions, 0 deletions
diff --git a/src/mcpp-runtime.c b/src/mcpp-runtime.c
index f498b20..592a342 100644
--- a/src/mcpp-runtime.c
+++ b/src/mcpp-runtime.c
@@ -76,6 +76,29 @@ path_join( const char *directory, const char *name )
 }
 
 
+static char *
+path_absolute( const char *path )
+{
+  char  cwd[PATH_MAX];
+  char *result;
+
+  if( path == NULL || *path == 0 )
+  {
+    errno = EINVAL;
+    return( NULL );
+  }
+
+  if( path[0] == '/' )
+    return( strdup(path) );
+
+  if( getcwd(cwd, sizeof(cwd)) == NULL )
+    return( NULL );
+
+  result = path_join( cwd, path );
+  return( result );
+}
+
+
 static int
 resolve_proc_self_exe( char path[PATH_MAX] )
 {
@@ -266,3 +289,43 @@ fail:
   free( system_include_path );
   return( -1 );
 }
+
+
+int
+mcpp_runtime_paths_set_root( mcpp_runtime_paths *paths, const char *root )
+{
+  char *installation_root;
+  char *config_file;
+  char *system_include_path;
+
+  if( paths == NULL || root == NULL || *root == 0 )
+  {
+    errno = EINVAL;
+    return( -1 );
+  }
+
+  installation_root = path_absolute( root );
+  if( installation_root == NULL )
+    return( -1 );
+
+  config_file = path_join( installation_root, "etc/mcpu-cpp.conf" );
+  if( config_file == NULL )
+    goto fail;
+
+  system_include_path = path_join( installation_root, "include" );
+  if( system_include_path == NULL )
+    goto fail;
+
+  free( paths->installation_root );
+  free( paths->config_file );
+  free( paths->system_include_path );
+  paths->installation_root = installation_root;
+  paths->config_file = config_file;
+  paths->system_include_path = system_include_path;
+  return( 0 );
+
+fail:
+  free( installation_root );
+  free( config_file );
+  return( -1 );
+}