+
+/*
+ * This function computes the length argument for the erase command.
+ * The length on which the command is to operate can be given in two forms:
+ * 1. <cmd> offset len - operate on <'offset', 'len')
+ * 2. <cmd> offset +len - operate on <'offset', 'round_up(len)')
+ * If the second form is used and the length doesn't fall on the
+ * sector boundary, than it will be adjusted to the next sector boundary.
+ * If it isn't in the flash, the function will fail (return -1).
+ * Input:
+ * arg: length specification (i.e. both command arguments)
+ * Output:
+ * len: computed length for operation
+ * Return:
+ * 1: success
+ * -1: failure (bad format, bad address).
+ */
+static int sf_parse_len_arg(char *arg, ulong *len)
+{
+ char *ep;
+ char round_up_len; /* indicates if the "+length" form used */
+ ulong len_arg;
+
+ round_up_len = 0;
+ if (*arg == '+') {
+ round_up_len = 1;
+ ++arg;
+ }
+
+ len_arg = simple_strtoul(arg, &ep, 16);
+ if (ep == arg || *ep != '\0')
+ return -1;
+
+ if (round_up_len && flash->sector_size > 0)
+ *len = ROUND(len_arg - 1, flash->sector_size);
+ else
+ *len = len_arg;
+
+ return 1;
+}
+