MFC, r284192:

  ------------------------------------------------------------------------
  r284192 | ken | 2015-06-09 15:39:38 -0600 (Tue, 09 Jun 2015) | 102 lines

  Add support for reading MAM attributes to camcontrol(8) and libcam(3).

  MAM is Medium Auxiliary Memory and is most commonly found as flash
  chips on tapes.

  This includes support for reading attributes and decoding most
  known attributes, but does not yet include support for writing
  attributes or reporting attributes in XML format.

  libsbuf/Makefile:
  	Add subr_prf.c for the new sbuf_hexdump() function.  This
  	function is essentially the same function.

  libsbuf/Symbol.map:
  	Add a new shared library minor version, and include the
  	sbuf_hexdump() function.

  libsbuf/Version.def:
  	Add version 1.4 of the libsbuf library.

  libutil/hexdump.3:
  	Document sbuf_hexdump() alongside hexdump(3), since it is
  	essentially the same function.

  camcontrol/Makefile:
  	Add attrib.c.

  camcontrol/attrib.c:
  	Implementation of READ ATTRIBUTE support for camcontrol(8).

  camcontrol/camcontrol.8:
  	Document the new 'camcontrol attrib' subcommand.

  camcontrol/camcontrol.c:
  	Add the new 'camcontrol attrib' subcommand.

  camcontrol/camcontrol.h:
  	Add a function prototype for scsiattrib().

  share/man/man9/sbuf.9:
  	Document the existence of sbuf_hexdump() and point users to
  	the hexdump(3) man page for more details.

  sys/cam/scsi/scsi_all.c:
  	Add a table of known attributes, text descriptions and
  	handler functions.

  	Add a new scsi_attrib_sbuf() function along with a number
  	of other related functions that help decode attributes.

  	scsi_attrib_ascii_sbuf() decodes ASCII format attributes.

  	scsi_attrib_int_sbuf() decodes binary format attributes, and
  	will pass them off to scsi_attrib_hexdump_sbuf() if they're
  	bigger than 8 bytes.

  	scsi_attrib_vendser_sbuf() decodes the vendor and drive
  	serial number attribute.

  	scsi_attrib_volcoh_sbuf() decodes the Volume Coherency
  	Information attribute that LTFS writes out.

  sys/cam/scsi/scsi_all.h:
  	Add a number of attribute-related structure definitions and
  	other defines.

  	Add function prototypes for all of the functions added in
  	scsi_all.c.

  sys/kern/subr_prf.c:
  	Add a new function, sbuf_hexdump().  This is the same as
  	the existing hexdump(9) function, except that it puts the
  	result in an sbuf.

  	This also changes subr_prf.c so that it can be compiled in
  	userland for includsion in libsbuf.

  	We should work to change this so that the kernel hexdump
  	implementation is a wrapper around sbuf_hexdump() with a
  	statically allocated sbuf with a drain.  That will require
  	a drain function that goes to the kernel printf() buffer
  	that can take a non-NUL terminated string as input.
  	That is because an sbuf isn't NUL-terminated until it is
  	finished, and we don't want to finish it while we're still
  	using it.

  	We should also work to consolidate the userland hexdump and
  	kernel hexdump implemenatations, which are currently
  	separate.  This would also mean making applications that
  	currently link in libutil link in libsbuf.

  sys/sys/sbuf.h:
  	Add the prototype for sbuf_hexdump(), and add another copy
  	of the hexdump flag values if they aren't already defined.

  	Ideally the flags should be defined in one place but the
  	implemenation makes it difficult to do properly.  (See
  	above.)

  Sponsored by:	Spectra Logic Corporation

------------------------------------------------------------------------

1 files changed, 63 insertions, 0 deletions

diff --git a/sys/kern/subr_prf.c b/sys/kern/subr_prf.c
index 28e33a4..ebc08e7 100644
--- a/sys/kern/subr_prf.c
+++ b/sys/kern/subr_prf.c
@@ -37,10 +37,13 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#ifdef _KERNEL
 #include "opt_ddb.h"
 #include "opt_printf.h"
+#endif  /* _KERNEL */
 
 #include <sys/param.h>
+#ifdef _KERNEL
 #include <sys/systm.h>
 #include <sys/lock.h>
 #include <sys/kdb.h>
@@ -57,7 +60,9 @@ __FBSDID("$FreeBSD$");
 #include <sys/syslog.h>
 #include <sys/cons.h>
 #include <sys/uio.h>
+#endif
 #include <sys/ctype.h>
+#include <sys/sbuf.h>
 
 #ifdef DDB
 #include <ddb/ddb.h>
@@ -69,6 +74,8 @@ __FBSDID("$FreeBSD$");
  */
 #include <machine/stdarg.h>
 
+#ifdef _KERNEL
+
 #define TOCONS	0x01
 #define TOTTY	0x02
 #define TOLOG	0x04
@@ -1122,3 +1129,59 @@ hexdump(const void *ptr, int length, const char *hdr, int flags)
 		printf("\n");
 	}
 }
+#endif /* _KERNEL */
+
+void
+sbuf_hexdump(struct sbuf *sb, const void *ptr, int length, const char *hdr,
+	     int flags)
+{
+	int i, j, k;
+	int cols;
+	const unsigned char *cp;
+	char delim;
+
+	if ((flags & HD_DELIM_MASK) != 0)
+		delim = (flags & HD_DELIM_MASK) >> 8;
+	else
+		delim = ' ';
+
+	if ((flags & HD_COLUMN_MASK) != 0)
+		cols = flags & HD_COLUMN_MASK;
+	else
+		cols = 16;
+
+	cp = ptr;
+	for (i = 0; i < length; i+= cols) {
+		if (hdr != NULL)
+			sbuf_printf(sb, "%s", hdr);
+
+		if ((flags & HD_OMIT_COUNT) == 0)
+			sbuf_printf(sb, "%04x  ", i);
+
+		if ((flags & HD_OMIT_HEX) == 0) {
+			for (j = 0; j < cols; j++) {
+				k = i + j;
+				if (k < length)
+					sbuf_printf(sb, "%c%02x", delim, cp[k]);
+				else
+					sbuf_printf(sb, "   ");
+			}
+		}
+
+		if ((flags & HD_OMIT_CHARS) == 0) {
+			sbuf_printf(sb, "  |");
+			for (j = 0; j < cols; j++) {
+				k = i + j;
+				if (k >= length)
+					sbuf_printf(sb, " ");
+				else if (cp[k] >= ' ' && cp[k] <= '~')
+					sbuf_printf(sb, "%c", cp[k]);
+				else
+					sbuf_printf(sb, ".");
+			}
+			sbuf_printf(sb, "|");
+		}
+		sbuf_printf(sb, "\n");
+	}
+}
+