add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/block/partitions/efi.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /************************************************************
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  * EFI GUID Partition Table handling
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  *
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@@ -6,21 +7,6 @@
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  *
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  * efi.[ch] by Matt Domsch <Matt_Domsch@dell.com>
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  *   Copyright 2000,2001,2002,2004 Dell Inc.
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- *
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- *  This program is free software; you can redistribute it and/or modify
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- *  it under the terms of the GNU General Public License as published by
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- *  the Free Software Foundation; either version 2 of the License, or
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- *  (at your option) any later version.
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- *
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- *  This program is distributed in the hope that it will be useful,
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- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *  GNU General Public License for more details.
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- *
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- *  You should have received a copy of the GNU General Public License
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- *  along with this program; if not, write to the Free Software
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- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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- *
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  *
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  * TODO:
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  *
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@@ -671,6 +657,31 @@
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 }
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 /**
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+ * utf16_le_to_7bit(): Naively converts a UTF-16LE string to 7-bit ASCII characters
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+ * @in: input UTF-16LE string
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+ * @size: size of the input string
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+ * @out: output string ptr, should be capable to store @size+1 characters
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+ *
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+ * Description: Converts @size UTF16-LE symbols from @in string to 7-bit
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+ * ASCII characters and stores them to @out. Adds trailing zero to @out array.
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+ */
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+static void utf16_le_to_7bit(const __le16 *in, unsigned int size, u8 *out)
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+{
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+	unsigned int i = 0;
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+
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+	out[size] = 0;
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+
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+	while (i < size) {
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+		u8 c = le16_to_cpu(in[i]) & 0xff;
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+
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+		if (c && !isprint(c))
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+			c = '!';
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+		out[i] = c;
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+		i++;
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+	}
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+}
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+
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+/**
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  * efi_partition(struct parsed_partitions *state)
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  * @state: disk parsed partitions
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  *
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@@ -706,7 +717,6 @@
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 	for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) {
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 		struct partition_meta_info *info;
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-		unsigned label_count = 0;
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 		unsigned label_max;
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 		u64 start = le64_to_cpu(ptes[i].starting_lba);
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 		u64 size = le64_to_cpu(ptes[i].ending_lba) -
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@@ -727,14 +737,7 @@
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 		/* Naively convert UTF16-LE to 7 bits. */
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 		label_max = min(ARRAY_SIZE(info->volname) - 1,
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 				ARRAY_SIZE(ptes[i].partition_name));
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-		info->volname[label_max] = 0;
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-		while (label_count < label_max) {
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-			u8 c = ptes[i].partition_name[label_count] & 0xff;
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-			if (c && !isprint(c))
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-				c = '!';
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-			info->volname[label_count] = c;
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-			label_count++;
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-		}
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+		utf16_le_to_7bit(ptes[i].partition_name, label_max, info->volname);
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 		state->parts[i + 1].has_info = true;
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 	}
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 	kfree(ptes);