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-rw-r--r--lib/common.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/lib/common.c b/lib/common.c
index 8041878..e278593 100644
--- a/lib/common.c
+++ b/lib/common.c
@@ -33,6 +33,9 @@
#include <stdlib.h>
#include <unistd.h>
#include "common.h"
+#include "libmtd.h"
+
+#define MTD_DEV_PATT "/dev/mtd%d"
/**
* get_multiplier - convert size specifier to an integer multiplier.
@@ -162,3 +165,46 @@ int util_srand(void)
srand(seed);
return 0;
}
+
+/**
+ * mtd_find_dev_node - Find the device node for an MTD
+ * @id: Identifier for the MTD. this can be the device node itself, or
+ * "mtd:<name>" to look up MTD by name
+ *
+ * This is a helper function to convert MTD device identifiers into their
+ * device node.
+ *
+ * Returns a pointer to a string containing the device node that must be
+ * free'd, or NULL on failure.
+ */
+char *mtd_find_dev_node(const char *id)
+{
+ struct mtd_dev_info info;
+ struct libmtd_t *lib_mtd;
+ char *node;
+ int ret;
+
+ if (strncmp(id, "mtd:", 4)) {
+ /* Assume @id is the device node */
+ return strdup(id);
+ }
+
+ /* Search for MTD matching name */
+ id += 4;
+
+ lib_mtd = libmtd_open();
+ if (!lib_mtd)
+ return NULL;
+
+ ret = mtd_get_dev_info2(lib_mtd, id, &info);
+ libmtd_close(lib_mtd);
+ if (ret < 0)
+ return NULL;
+
+ node = malloc(strlen(MTD_DEV_PATT) + 20);
+ if (!node)
+ return NULL;
+
+ sprintf(node, MTD_DEV_PATT, info.mtd_num);
+ return node;
+}