server: Move the functions to extend file to mapping.c since it's the only user.
diff --git a/server/mapping.c b/server/mapping.c
index a303111..39c7f50 100644
--- a/server/mapping.c
+++ b/server/mapping.c
@@ -126,6 +126,48 @@
#define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
+/* extend a file beyond the current end of file */
+static int extend_file( struct file *file, file_pos_t new_size )
+{
+ static const char zero;
+ int unix_fd = get_file_unix_fd( file );
+ off_t size = new_size;
+
+ if (unix_fd == -1) return 0;
+
+ if (sizeof(new_size) > sizeof(size) && size != new_size)
+ {
+ set_error( STATUS_INVALID_PARAMETER );
+ return 0;
+ }
+ /* extend the file one byte beyond the requested size and then truncate it */
+ /* this should work around ftruncate implementations that can't extend files */
+ if (pwrite( unix_fd, &zero, 1, size ) != -1)
+ {
+ ftruncate( unix_fd, size );
+ return 1;
+ }
+ file_set_error();
+ return 0;
+}
+
+/* try to grow the file to the specified size */
+static int grow_file( struct file *file, file_pos_t size )
+{
+ struct stat st;
+ int unix_fd = get_file_unix_fd( file );
+
+ if (unix_fd == -1) return 0;
+
+ if (fstat( unix_fd, &st ) == -1)
+ {
+ file_set_error();
+ return 0;
+ }
+ if (st.st_size >= size) return 1; /* already large enough */
+ return extend_file( file, size );
+}
+
/* find the shared PE mapping for a given mapping */
static struct file *get_shared_file( struct mapping *mapping )
{
