Create procfs_utils.c; File missed from last commit; + remove warning from mm_memalign.c (how did this work before?)

include/nuttx/fs/procfs.h

@@ -134,7 +134,50 @@ extern "C" {
 #define EXTERN extern
 #endif
 
-/* Nothing here yet */
+/****************************************************************************
+ * Name: procfs_memcpy
+ *
+ * Description:
+ *   procfs/ file data may be read by the user with different user buffer
+ *   sizes to receive the data.  If the amount of data to be returned is
+ *   large or if the callers receive buffer is small, then multiple read
+ *   operations will be required.
+ *
+ *   If multiple read operations are required, then each read operation will
+ *   be identical accept that file position (f_pos) will be incremented with
+ *   each read:  f_pos must be incremented by the read method after each
+ *   read operation to provide the 'offset' for the next read.
+ *
+ *   procfs_memcpy() is a helper function.  Each read() method should
+ *   provide data in a local data buffer ('src' and 'srclen').  This
+ *   will transfer the data to the user receive buffer ('dest' and 'destlen'),
+ *   respecting both (1) the size of the destination buffer so that it will
+ *   write beyond the user receiver and (1) the file position, 'offset'.
+ *
+ *   This function will skip over data until the under of bytes specified
+ *   by 'offset' have been skipped.  Then it will transfer data from the
+ *   the procfs/ 'src' buffer into the user receive buffer.  No more than
+ *   'destlen' bytes will be transferred.
+ *
+ * Input Parameters:
+ *   src     - The address of the intermediate procfs/ buffer containing the
+ *             data to be returned.
+ *   srclen  - The number of bytes of data in the 'src' buffer
+ *   dest    - The address of the user's receive buffer.
+ *   destlen - The size (in bytes) of the user's receive buffer.
+ *   offset  - On input, this is the number of bytes to skip before returning
+ *             data;  If bytes were skipped, this offset will be decremented.
+ *             Data will not be transferred until this offset decrements to
+ *             zero.
+ *
+ * Returned Value:
+ *   The number of bytes actually transferred into the user's receive buffer.
+ *
+ ****************************************************************************/
+
+size_t procfs_memcpy(FAR const char *src, size_t srclen,
+                     FAR char *dest, size_t destlen,
+                     off_t *offset);
 
 #undef EXTERN
 #ifdef __cplusplus