allow flash/nand banks commands to accept names

Add get_flash_bank_by_name (and get_nand_device_by_name) helpers
to retrieves struct flash_bank * (struct nand_device *) given a
driver name and an (optional) driver-specific bank index.

These are used to extend flash_command_get_bank_by_num (and
nand_command_get_device_by_num) to allow all flash (nand) commands to
reference defined banks by name, not just by number.

To avoid some code duplication, add the flash/common.[ch] files to hold
functionality common to both types driver.  The first two methods are
helpers for the above routines to find a bank specified by a "name" or
"name.index" string.  get_flash_name_index() finds the '.index' portion,
while flash_driver_name_matches() performs the string portion matching.

1 files changed, 46 insertions, 0 deletions

diff --git a/src/flash/common.c b/src/flash/common.c
new file mode 100644
index 00000000..253ed9d8
--- /dev/null
+++ b/src/flash/common.c
@@ -0,0 +1,46 @@
+/***************************************************************************
+ *   Copyright (C) 2009 by Zachary T Welch <zw@superlucidity.net>          *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "common.h"
+#include "log.h"
+
+unsigned get_flash_name_index(const char *name)
+{
+	const char *index = strchr(name, '.');
+	if (NULL == index)
+		return 0;
+	unsigned requested;
+	int retval = parse_uint(index + 1, &requested);
+	// detect parsing error by forcing past end of bank list
+	return (ERROR_OK == retval) ? requested : ~0U;
+}
+
+bool flash_driver_name_matches(const char *name, const char *expected)
+{
+	unsigned blen = strlen(name);
+	// only match up to the length of the driver name...
+	if (strncmp(name, expected, blen) != 0)
+		return false;
+
+	// ...then check that name terminates at this spot.
+	return expected[blen] == '.' || expected[blen] == '\0';
+}