file/fat: add utime function

This emulates the traditional utime function from UNIX clones to allow
for manual updates of the modification timestamp on files and directories.

This should only prove useful for non-native targets as those usually
have a libc version of utime.

Change-Id: Iea8a1d328e78b92c400d3354ee80689c7cf53af8

1 files changed, 38 insertions, 0 deletions

diff --git a/firmware/common/file.c b/firmware/common/file.c
index cb918c6eab..c090c40be5 100644
--- a/firmware/common/file.c
+++ b/firmware/common/file.c
@@ -1123,6 +1123,44 @@ file_error:
     return rc;
 }
 
+int utime(const char *path, const struct utimbuf* times)
+{
+    DEBUGF("utime(path=\"%s\",times->modtime=%u)\n", path, times->modtime);
+
+    int rc, open1rc = -1;
+    struct filestr_base pathstr;
+    struct path_component_info pathinfo;
+
+    file_internal_lock_WRITER();
+
+    if (!times)
+        FILE_ERROR(EINVAL, -1);
+
+    open1rc = open_stream_internal(path, FF_ANYTYPE | FF_PARENTINFO,
+                                   &pathstr, &pathinfo);
+    if (open1rc <= 0)
+    {
+        DEBUGF("Failed opening path: %d\n", open1rc);
+        if (open1rc == 0)
+            FILE_ERROR(ENOENT, -2);
+        else
+            FILE_ERROR(ERRNO, open1rc * 10 - 1);
+    }
+
+    rc = fat_utime(&pathinfo.parentinfo.fatfile, pathstr.fatstr.fatfilep,
+                   times);
+    if (rc < 0)
+    {
+        DEBUGF("I/O error during utime: %d\n", rc);
+        FILE_ERROR(ERRNO, rc * 10 - 2);
+    }
+
+file_error:
+    if (open1rc >= 0)
+        close_stream_internal(&pathstr);
+    file_internal_unlock_WRITER();
+    return rc;
+}
 
 /** Extensions **/