LKML Archive on lore.kernel.org
 help / color / Atom feed
* [PATCH v5] vfat: Deduplicate hex2bin()
@ 2017-07-31 14:33 Andy Shevchenko
  2017-07-31 18:40 ` OGAWA Hirofumi
  0 siblings, 1 reply; 8+ messages in thread
From: Andy Shevchenko @ 2017-07-31 14:33 UTC (permalink / raw)
  To: OGAWA Hirofumi, linux-kernel, Joe Perches; +Cc: Andy Shevchenko

We may use hex2bin() instead of custom approach.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 This is blast from the past (2011). Instead of dirty looking bitwise
 types here, though __be16 would be correct, I decide to go with
 an array of two u8 items.

 This patch relies on
 http://marc.info/?l=linux-kernel&m=150150935411183&w=2 being applied,
 which is currently not.

 fs/fat/namei_vfat.c | 35 ++++++++++-------------------------
 1 file changed, 10 insertions(+), 25 deletions(-)

diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index 6a7152d0c250..56127f76c41f 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -17,6 +17,7 @@
 
 #include <linux/module.h>
 #include <linux/ctype.h>
+#include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/namei.h>
 #include "fat.h"
@@ -510,11 +511,10 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
 	     struct nls_table *nls)
 {
 	const unsigned char *ip;
-	unsigned char nc;
 	unsigned char *op;
-	unsigned int ec;
-	int i, k, fill;
+	int i, fill;
 	int charlen;
+	u8 hc[2];
 
 	if (utf8) {
 		*outlen = utf8s_to_utf16s(name, len, UTF16_HOST_ENDIAN,
@@ -532,31 +532,16 @@ xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
 			if (escape && (*ip == ':')) {
 				if (i > len - 5)
 					return -EINVAL;
-				ec = 0;
-				for (k = 1; k < 5; k++) {
-					nc = ip[k];
-					ec <<= 4;
-					if (nc >= '0' && nc <= '9') {
-						ec |= nc - '0';
-						continue;
-					}
-					if (nc >= 'a' && nc <= 'f') {
-						ec |= nc - ('a' - 10);
-						continue;
-					}
-					if (nc >= 'A' && nc <= 'F') {
-						ec |= nc - ('A' - 10);
-						continue;
-					}
-					return -EINVAL;
-				}
-				*op++ = ec & 0xFF;
-				*op++ = ec >> 8;
+
+				fill = hex2bin(hc, ip + 1, 2);
+				if (fill)
+					return fill;
+				*op++ = hc[1];
+				*op++ = hc[0];
 				ip += 5;
 				i += 5;
 			} else {
-				charlen = nls->char2uni(ip, len - i,
-									(wchar_t *)op);
+				charlen = nls->char2uni(ip, len - i, (wchar_t *)op);
 				if (charlen < 0)
 					return -EINVAL;
 				ip += charlen;
-- 
2.13.2

^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, back to index

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-07-31 14:33 [PATCH v5] vfat: Deduplicate hex2bin() Andy Shevchenko
2017-07-31 18:40 ` OGAWA Hirofumi
2017-07-31 18:44   ` OGAWA Hirofumi
2017-07-31 19:31     ` Andy Shevchenko
2017-07-31 20:54       ` OGAWA Hirofumi
2017-08-01 12:56         ` Andy Shevchenko
2017-07-31 19:39   ` Andy Shevchenko
2017-07-31 20:56     ` OGAWA Hirofumi

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git
	git clone --mirror https://lore.kernel.org/lkml/9 lkml/git/9.git
	git clone --mirror https://lore.kernel.org/lkml/10 lkml/git/10.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git