[PATCH 21/38] xfs_db: create hex string as a field type

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Define a field type for hex strings so that we can print things such as:

file_digest = deadbeef31337023aaaa

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 db/field.c  |    2 ++
 db/field.h  |    1 +
 db/fprint.c |   24 ++++++++++++++++++++++++
 db/fprint.h |    2 ++
 4 files changed, 29 insertions(+)


diff --git a/db/field.c b/db/field.c
index d5879f4ada7d..066239ae6073 100644
--- a/db/field.c
+++ b/db/field.c
@@ -158,6 +158,8 @@ const ftattr_t	ftattrtab[] = {
 	{ FLDT_CHARNS, "charns", fp_charns, NULL, SI(bitsz(char)), 0, NULL,
 	  NULL },
 	{ FLDT_CHARS, "chars", fp_num, "%c", SI(bitsz(char)), 0, NULL, NULL },
+	{ FLDT_HEXSTRING, "hexstring", fp_hexstr, NULL, SI(bitsz(char)), 0, NULL,
+	  NULL },
 	{ FLDT_REXTLEN, "rextlen", fp_num, "%u", SI(RMAPBT_BLOCKCOUNT_BITLEN),
 	  0, NULL, NULL },
 	{ FLDT_RFILEOFFD, "rfileoffd", fp_num, "%llu", SI(RMAPBT_OFFSET_BITLEN),
diff --git a/db/field.h b/db/field.h
index f1b4f4e217de..89752d07b84c 100644
--- a/db/field.h
+++ b/db/field.h
@@ -67,6 +67,7 @@ typedef enum fldt	{
 	FLDT_CFSBLOCK,
 	FLDT_CHARNS,
 	FLDT_CHARS,
+	FLDT_HEXSTRING,
 	FLDT_REXTLEN,
 	FLDT_RFILEOFFD,
 	FLDT_REXTFLG,
diff --git a/db/fprint.c b/db/fprint.c
index ac916d511e87..182e5b7cb27c 100644
--- a/db/fprint.c
+++ b/db/fprint.c
@@ -54,6 +54,30 @@ fp_charns(
 	return 1;
 }
 
+int
+fp_hexstr(
+	void	*obj,
+	int	bit,
+	int	count,
+	char	*fmtstr,
+	int	size,
+	int	arg,
+	int	base,
+	int	array)
+{
+	int	i;
+	char	*p;
+
+	ASSERT(bitoffs(bit) == 0);
+	ASSERT(size == bitsz(char));
+	for (i = 0, p = (char *)obj + byteize(bit);
+	     i < count && !seenint();
+	     i++, p++) {
+		dbprintf("%02x", *p & 0xff);
+	}
+	return 1;
+}
+
 int
 fp_num(
 	void		*obj,
diff --git a/db/fprint.h b/db/fprint.h
index a1ea935ca531..348e04215588 100644
--- a/db/fprint.h
+++ b/db/fprint.h
@@ -9,6 +9,8 @@ typedef int (*prfnc_t)(void *obj, int bit, int count, char *fmtstr, int size,
 
 extern int	fp_charns(void *obj, int bit, int count, char *fmtstr, int size,
 			  int arg, int base, int array);
+extern int	fp_hexstr(void *obj, int bit, int count, char *fmtstr, int size,
+			  int arg, int base, int array);
 extern int	fp_num(void *obj, int bit, int count, char *fmtstr, int size,
 		       int arg, int base, int array);
 extern int	fp_sarray(void *obj, int bit, int count, char *fmtstr, int size,