/* seq_read.h -- read the .mh_sequence file and
 *            -- initialize sequence information
 *
 * This code is Copyright (c) 2017, by the authors of nmh.  See the
 * COPYRIGHT file in the root directory of the nmh distribution for
 * complete copyright information. */

/*
 * Read the sequence files for the folder referenced in the given
 * struct msgs and populate the sequence entries in the struct msgs.
 *
 * Arguments:
 *
 * mp		- Folder structure to add sequence entries to
 * lockflag	- If true, obtain a write lock on the sequence file.
 *		  Additionally, the sequence file will remain open
 *		  and a pointer to the filehandle will be stored in
 *		  folder structure, where it will later be used by
 *		  seq_save().
 *
 * Return values:
 *     OK       - successfully read the sequence files, or they don't exist
 *     NOTOK    - failed to lock sequence file
 */
int seq_read(struct msgs *, int);