[PATCH v2 00/10] lib: introduce string_escape_mem an %*pE specifier

[PATCH v2 00/10] lib: introduce string_escape_mem an %*pE specifier

[Andy Shevchenko]

The introduced function is a kind of opposite to string_unescape. We have
several users of such functionality each of them created custom implementation.
The series contains clean up of test suite, adding new call, and switching few
users to use it via %*pE specifier.

Test suite covers all of existing and most of potential use cases.

Changelog v2:
- addressed Joe's comments:
  - added patch 4/10
  - moving patches 5/10-10/10 to %*pE instead of direct string_escape_mem call,
    as a result the series and code looks cleaner 
- address few of Andrew's comments:
  - added patch 1/10
  - kernel documentation moved to c-file
  - when test case fails the necessary messages are printed on KERN_WARNING
    level

Andy Shevchenko (10):
  lib / string_helpers: move documentation to c-file
  lib / string_helpers: refactoring the test suite
  lib / string_helpers: introduce string_escape_mem()
  lib/vsprintf: add %*pE[achnops] format specifier
  wireless: libertas: print esaped string via %*pE
  wireless: ipw2x00: print SSID via %*pE
  lib80211: remove unused print_ssid()
  staging: wlan-ng: use %*pEhp to print SN
  staging: rtl8192e: use %*pEn to escape buffer
  staging: rtl8192u: use %*pEn to escape buffer

 Documentation/printk-formats.txt               |  28 +++
 drivers/net/wireless/ipw2x00/ipw2100.c         |  22 +-
 drivers/net/wireless/ipw2x00/ipw2200.c         | 270 +++++++--------------
 drivers/net/wireless/ipw2x00/libipw_rx.c       |  65 +++---
 drivers/net/wireless/ipw2x00/libipw_wx.c       |  16 +-
 drivers/net/wireless/libertas/cfg.c            |   8 +-
 drivers/net/wireless/libertas/mesh.c           |   7 +-
 drivers/staging/rtl8192e/rtllib.h              |  14 +-
 drivers/staging/rtl8192u/ieee80211/ieee80211.h |  14 +-
 drivers/staging/wlan-ng/prism2sta.c            |  28 +--
 include/linux/string_helpers.h                 |  65 +++---
 include/net/lib80211.h                         |   5 -
 lib/string_helpers.c                           | 312 +++++++++++++++++++++++++
 lib/test-string_helpers.c                      | 250 +++++++++++++++++++-
 lib/vsprintf.c                                 |  72 ++++++
 net/wireless/lib80211.c                        |  32 ---
 16 files changed, 817 insertions(+), 391 deletions(-)

-- 
2.0.1

[PATCH v2 01/10] lib / string_helpers: move documentation to c-file

[Andy Shevchenko]

The documentation of API belongs to c-file. This patch moves it accordingly.

There is no functional change.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 include/linux/string_helpers.h | 34 ----------------------------------
 lib/string_helpers.c           | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 34 deletions(-)

diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h
index 3eeee96..5a30f2a 100644
--- a/include/linux/string_helpers.h
+++ b/include/linux/string_helpers.h
@@ -20,40 +20,6 @@ int string_get_size(u64 size, enum string_size_units units,
 #define UNESCAPE_ANY		\
 	(UNESCAPE_SPACE | UNESCAPE_OCTAL | UNESCAPE_HEX | UNESCAPE_SPECIAL)
 
-/**
- * string_unescape - unquote characters in the given string
- * @src:	source buffer (escaped)
- * @dst:	destination buffer (unescaped)
- * @size:	size of the destination buffer (0 to unlimit)
- * @flags:	combination of the flags (bitwise OR):
- *	%UNESCAPE_SPACE:
- *		'\f' - form feed
- *		'\n' - new line
- *		'\r' - carriage return
- *		'\t' - horizontal tab
- *		'\v' - vertical tab
- *	%UNESCAPE_OCTAL:
- *		'\NNN' - byte with octal value NNN (1 to 3 digits)
- *	%UNESCAPE_HEX:
- *		'\xHH' - byte with hexadecimal value HH (1 to 2 digits)
- *	%UNESCAPE_SPECIAL:
- *		'\"' - double quote
- *		'\\' - backslash
- *		'\a' - alert (BEL)
- *		'\e' - escape
- *	%UNESCAPE_ANY:
- *		all previous together
- *
- * Returns amount of characters processed to the destination buffer excluding
- * trailing '\0'.
- *
- * Because the size of the output will be the same as or less than the size of
- * the input, the transformation may be performed in place.
- *
- * Caller must provide valid source and destination pointers. Be aware that
- * destination buffer will always be NULL-terminated. Source string must be
- * NULL-terminated as well.
- */
 int string_unescape(char *src, char *dst, size_t size, unsigned int flags);
 
 static inline int string_unescape_inplace(char *buf, unsigned int flags)
diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 29033f3..74ec604 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -168,6 +168,44 @@ static bool unescape_special(char **src, char **dst)
 	return true;
 }
 
+/**
+ * string_unescape - unquote characters in the given string
+ * @src:	source buffer (escaped)
+ * @dst:	destination buffer (unescaped)
+ * @size:	size of the destination buffer (0 to unlimit)
+ * @flags:	combination of the flags (bitwise OR):
+ *	%UNESCAPE_SPACE:
+ *		'\f' - form feed
+ *		'\n' - new line
+ *		'\r' - carriage return
+ *		'\t' - horizontal tab
+ *		'\v' - vertical tab
+ *	%UNESCAPE_OCTAL:
+ *		'\NNN' - byte with octal value NNN (1 to 3 digits)
+ *	%UNESCAPE_HEX:
+ *		'\xHH' - byte with hexadecimal value HH (1 to 2 digits)
+ *	%UNESCAPE_SPECIAL:
+ *		'\"' - double quote
+ *		'\\' - backslash
+ *		'\a' - alert (BEL)
+ *		'\e' - escape
+ *	%UNESCAPE_ANY:
+ *		all previous together
+ *
+ * Description:
+ * The function unquotes characters in the given string.
+ *
+ * Because the size of the output will be the same as or less than the size of
+ * the input, the transformation may be performed in place.
+ *
+ * Caller must provide valid source and destination pointers. Be aware that
+ * destination buffer will always be NULL-terminated. Source string must be
+ * NULL-terminated as well.
+ *
+ * Return:
+ * The amount of the characters processed to the destination buffer excluding
+ * trailing '\0' is returned.
+ */
 int string_unescape(char *src, char *dst, size_t size, unsigned int flags)
 {
 	char *out = dst;
-- 
2.0.1

[PATCH v2 02/10] lib / string_helpers: refactoring the test suite

[Andy Shevchenko]

This patch prepares test suite for a following update. It introduces
test_string_check_buf() helper which checks the result and dumps an error.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 lib/test-string_helpers.c | 39 +++++++++++++++++++++++++++------------
 1 file changed, 27 insertions(+), 12 deletions(-)

diff --git a/lib/test-string_helpers.c b/lib/test-string_helpers.c
index 6ac48de..ac44c92 100644
--- a/lib/test-string_helpers.c
+++ b/lib/test-string_helpers.c
@@ -10,6 +10,26 @@
 #include <linux/string.h>
 #include <linux/string_helpers.h>
 
+static __init bool test_string_check_buf(const char *name, unsigned int flags,
+					 char *in, size_t p,
+					 char *out_real, size_t q_real,
+					 char *out_test, size_t q_test)
+{
+	if (q_real == q_test && !memcmp(out_test, out_real, q_test))
+		return true;
+
+	pr_warn("Test '%s' failed: flags = %u\n", name, flags);
+
+	print_hex_dump(KERN_WARNING, "Input: ", DUMP_PREFIX_NONE, 16, 1,
+		       in, p, true);
+	print_hex_dump(KERN_WARNING, "Expected: ", DUMP_PREFIX_NONE, 16, 1,
+		       out_test, q_test, true);
+	print_hex_dump(KERN_WARNING, "Got: ", DUMP_PREFIX_NONE, 16, 1,
+		       out_real, q_real, true);
+
+	return false;
+}
+
 struct test_string {
 	const char *in;
 	const char *out;
@@ -39,7 +59,8 @@ static const struct test_string strings[] __initconst = {
 	},
 };
 
-static void __init test_string_unescape(unsigned int flags, bool inplace)
+static void __init test_string_unescape(const char *name, unsigned int flags,
+					bool inplace)
 {
 	char in[256];
 	char out_test[256];
@@ -77,15 +98,8 @@ static void __init test_string_unescape(unsigned int flags, bool inplace)
 		q_real = string_unescape(in, out_real, q_real, flags);
 	}
 
-	if (q_real != q_test || memcmp(out_test, out_real, q_test)) {
-		pr_warn("Test failed: flags = %u\n", flags);
-		print_hex_dump(KERN_WARNING, "Input: ",
-			       DUMP_PREFIX_NONE, 16, 1, in, p - 1, true);
-		print_hex_dump(KERN_WARNING, "Expected: ",
-			       DUMP_PREFIX_NONE, 16, 1, out_test, q_test, true);
-		print_hex_dump(KERN_WARNING, "Got: ",
-			       DUMP_PREFIX_NONE, 16, 1, out_real, q_real, true);
-	}
+	test_string_check_buf(name, flags, in, p - 1, out_real, q_real,
+			      out_test, q_test);
 }
 
 static int __init test_string_helpers_init(void)
@@ -94,8 +108,9 @@ static int __init test_string_helpers_init(void)
 
 	pr_info("Running tests...\n");
 	for (i = 0; i < UNESCAPE_ANY + 1; i++)
-		test_string_unescape(i, false);
-	test_string_unescape(get_random_int() % (UNESCAPE_ANY + 1), true);
+		test_string_unescape("unescape", i, false);
+	test_string_unescape("unescape inplace",
+			     get_random_int() % (UNESCAPE_ANY + 1), true);
 
 	return -EINVAL;
 }
-- 
2.0.1

[PATCH v2 03/10] lib / string_helpers: introduce string_escape_mem()

[Andy Shevchenko]

This is almost the opposite function to string_unescape(). Nevertheless it
handles \0 and could be used for any byte buffer.

The documentation is supplied together with the function prototype.

The test cases covers most of the scenarios and would be expanded later on.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 include/linux/string_helpers.h |  31 +++++
 lib/string_helpers.c           | 274 +++++++++++++++++++++++++++++++++++++++++
 lib/test-string_helpers.c      | 213 ++++++++++++++++++++++++++++++++
 3 files changed, 518 insertions(+)

diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h
index 5a30f2a..6eb567a 100644
--- a/include/linux/string_helpers.h
+++ b/include/linux/string_helpers.h
@@ -37,4 +37,35 @@ static inline int string_unescape_any_inplace(char *buf)
 	return string_unescape_any(buf, buf, 0);
 }
 
+#define ESCAPE_SPACE		0x01
+#define ESCAPE_SPECIAL		0x02
+#define ESCAPE_NULL		0x04
+#define ESCAPE_OCTAL		0x08
+#define ESCAPE_ANY		\
+	(ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_SPECIAL | ESCAPE_NULL)
+#define ESCAPE_NP		0x10
+#define ESCAPE_ANY_NP		(ESCAPE_ANY | ESCAPE_NP)
+#define ESCAPE_HEX		0x20
+
+int string_escape_mem(const char *src, size_t isz, char **dst, size_t osz,
+		unsigned int flags, const char *esc);
+
+static inline int string_escape_mem_any_np(const char *src, size_t isz,
+		char **dst, size_t osz, const char *esc)
+{
+	return string_escape_mem(src, isz, dst, osz, ESCAPE_ANY_NP, esc);
+}
+
+static inline int string_escape_str(const char *src, char **dst, size_t sz,
+		unsigned int flags, const char *esc)
+{
+	return string_escape_mem(src, strlen(src), dst, sz, flags, esc);
+}
+
+static inline int string_escape_str_any_np(const char *src, char **dst,
+		size_t sz, const char *esc)
+{
+	return string_escape_str(src, dst, sz, ESCAPE_ANY_NP, esc);
+}
+
 #endif
diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 74ec604..58b78ba 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -8,6 +8,8 @@
 #include <linux/math64.h>
 #include <linux/export.h>
 #include <linux/ctype.h>
+#include <linux/errno.h>
+#include <linux/string.h>
 #include <linux/string_helpers.h>
 
 /**
@@ -240,3 +242,275 @@ int string_unescape(char *src, char *dst, size_t size, unsigned int flags)
 	return out - dst;
 }
 EXPORT_SYMBOL(string_unescape);
+
+static int escape_passthrough(unsigned char c, char **dst, size_t *osz)
+{
+	char *out = *dst;
+
+	if (*osz < 1)
+		return -ENOMEM;
+
+	*out++ = c;
+
+	*dst = out;
+	*osz -= 1;
+
+	return 1;
+}
+
+static int escape_space(unsigned char c, char **dst, size_t *osz)
+{
+	char *out = *dst;
+	unsigned char to;
+
+	if (*osz < 2)
+		return -ENOMEM;
+
+	switch (c) {
+	case '\n':
+		to = 'n';
+		break;
+	case '\r':
+		to = 'r';
+		break;
+	case '\t':
+		to = 't';
+		break;
+	case '\v':
+		to = 'v';
+		break;
+	case '\f':
+		to = 'f';
+		break;
+	default:
+		return 0;
+	}
+
+	*out++ = '\\';
+	*out++ = to;
+
+	*dst = out;
+	*osz -= 2;
+
+	return 1;
+}
+
+static int escape_special(unsigned char c, char **dst, size_t *osz)
+{
+	char *out = *dst;
+	unsigned char to;
+
+	if (*osz < 2)
+		return -ENOMEM;
+
+	switch (c) {
+	case '\\':
+		to = '\\';
+		break;
+	case '\a':
+		to = 'a';
+		break;
+	case '\e':
+		to = 'e';
+		break;
+	default:
+		return 0;
+	}
+
+	*out++ = '\\';
+	*out++ = to;
+
+	*dst = out;
+	*osz -= 2;
+
+	return 1;
+}
+
+static int escape_null(unsigned char c, char **dst, size_t *osz)
+{
+	char *out = *dst;
+
+	if (*osz < 2)
+		return -ENOMEM;
+
+	if (c)
+		return 0;
+
+	*out++ = '\\';
+	*out++ = '0';
+
+	*dst = out;
+	*osz -= 2;
+
+	return 1;
+}
+
+static int escape_octal(unsigned char c, char **dst, size_t *osz)
+{
+	char *out = *dst;
+
+	if (*osz < 4)
+		return -ENOMEM;
+
+	*out++ = '\\';
+	*out++ = ((c >> 6) & 0x07) + '0';
+	*out++ = ((c >> 3) & 0x07) + '0';
+	*out++ = ((c >> 0) & 0x07) + '0';
+
+	*dst = out;
+	*osz -= 4;
+
+	return 1;
+}
+
+static int escape_hex(unsigned char c, char **dst, size_t *osz)
+{
+	char *out = *dst;
+
+	if (*osz < 4)
+		return -ENOMEM;
+
+	*out++ = '\\';
+	*out++ = 'x';
+	*out++ = hex_asc_hi(c);
+	*out++ = hex_asc_lo(c);
+
+	*dst = out;
+	*osz -= 4;
+
+	return 1;
+}
+
+/**
+ * string_escape_mem - quote characters in the given memory buffer
+ * @src:	source buffer (unescaped)
+ * @isz:	source buffer size
+ * @dst:	destination buffer (escaped)
+ * @osz:	destination buffer size
+ * @flags:	combination of the flags (bitwise OR):
+ *	%ESCAPE_SPACE:
+ *		'\f' - form feed
+ *		'\n' - new line
+ *		'\r' - carriage return
+ *		'\t' - horizontal tab
+ *		'\v' - vertical tab
+ *	%ESCAPE_SPECIAL:
+ *		'\\' - backslash
+ *		'\a' - alert (BEL)
+ *		'\e' - escape
+ *	%ESCAPE_NULL:
+ *		'\0' - null
+ *	%ESCAPE_OCTAL:
+ *		'\NNN' - byte with octal value NNN (3 digits)
+ *	%ESCAPE_ANY:
+ *		all previous together
+ *	%ESCAPE_NP:
+ *		escape only non-printable characters (checked by isprint)
+ *	%ESCAPE_ANY_NP:
+ *		all previous together
+ *	%ESCAPE_HEX:
+ *		'\xHH' - byte with hexadecimal value HH (2 digits)
+ * @esc:	NULL-terminated string of characters any of which, if found in
+ *		the source, has to be escaped
+ *
+ * Description:
+ * The process of escaping byte buffer includes several parts. They are applied
+ * in the following sequence.
+ *	1. The character is matched to the printable class, if asked, and in
+ *	   case of match it passes through to the output.
+ *	2. The character is not matched to the one from @esc string and thus
+ *	   must go as is to the output.
+ *	3. The character is checked if it falls into the class given by @flags.
+ *	   %ESCAPE_OCTAL and %ESCAPE_HEX are going last since they cover any
+ *	   character. Note that they actually can't go together, otherwise
+ *	   %ESCAPE_HEX will be ignored.
+ *
+ * Caller must provide valid source and destination pointers. Be aware that
+ * destination buffer will not be NULL-terminated, thus caller have to append
+ * it if needs.
+ *
+ * Return:
+ * The amount of the characters processed to the destination buffer, or
+ * %-ENOMEM if the size of buffer is not enough to put an escaped character is
+ * returned.
+ *
+ * Even in the case of error @dst pointer will be updated to point to the byte
+ * after the last processed character.
+ */
+int string_escape_mem(const char *src, size_t isz, char **dst, size_t osz,
+		      unsigned int flags, const char *esc)
+{
+	char *out = *dst, *p = out;
+	bool is_dict = esc && *esc;
+	int ret = 0;
+
+	while (isz--) {
+		unsigned char c = *src++;
+
+		/*
+		 * Apply rules in the following sequence:
+		 *	- the character is printable, when @flags has
+		 *	  %ESCAPE_NP bit set
+		 *	- the @esc string is supplied and does not contain a
+		 *	  character under question
+		 *	- the character doesn't fall into a class of symbols
+		 *	  defined by given @flags
+		 * In these cases we just pass through a character to the
+		 * output buffer.
+		 */
+		if ((flags & ESCAPE_NP && isprint(c)) ||
+		    (is_dict && !strchr(esc, c))) {
+			/* do nothing */
+		} else {
+			if (flags & ESCAPE_SPACE) {
+				ret = escape_space(c, &p, &osz);
+				if (ret < 0)
+					break;
+				if (ret > 0)
+					continue;
+			}
+
+			if (flags & ESCAPE_SPECIAL) {
+				ret = escape_special(c, &p, &osz);
+				if (ret < 0)
+					break;
+				if (ret > 0)
+					continue;
+			}
+
+			if (flags & ESCAPE_NULL) {
+				ret = escape_null(c, &p, &osz);
+				if (ret < 0)
+					break;
+				if (ret > 0)
+					continue;
+			}
+
+			/* ESCAPE_OCTAL and ESCAPE_HEX always go last */
+			if (flags & ESCAPE_OCTAL) {
+				ret = escape_octal(c, &p, &osz);
+				if (ret < 0)
+					break;
+				continue;
+			}
+			if (flags & ESCAPE_HEX) {
+				ret = escape_hex(c, &p, &osz);
+				if (ret < 0)
+					break;
+				continue;
+			}
+		}
+
+		ret = escape_passthrough(c, &p, &osz);
+		if (ret < 0)
+			break;
+	}
+
+	*dst = p;
+
+	if (ret < 0)
+		return ret;
+
+	return p - out;
+}
+EXPORT_SYMBOL(string_escape_mem);
diff --git a/lib/test-string_helpers.c b/lib/test-string_helpers.c
index ac44c92..1e6fb85 100644
--- a/lib/test-string_helpers.c
+++ b/lib/test-string_helpers.c
@@ -102,6 +102,209 @@ static void __init test_string_unescape(const char *name, unsigned int flags,
 			      out_test, q_test);
 }
 
+struct test_string_1 {
+	const char *out;
+	unsigned int flags;
+};
+
+#define	TEST_STRING_2_MAX_S1		32
+struct test_string_2 {
+	const char *in;
+	struct test_string_1 s1[TEST_STRING_2_MAX_S1];
+};
+
+#define	TEST_STRING_2_DICT_0		NULL
+static const struct test_string_2 escape0[] __initconst = {{
+	.in = "\f\\ \n\r\t\v",
+	.s1 = {{
+		.out = "\\f\\ \\n\\r\\t\\v",
+		.flags = ESCAPE_SPACE,
+	},{
+		.out = "\\f\\134\\040\\n\\r\\t\\v",
+		.flags = ESCAPE_SPACE | ESCAPE_OCTAL,
+	},{
+		.out = "\\f\\x5c\\x20\\n\\r\\t\\v",
+		.flags = ESCAPE_SPACE | ESCAPE_HEX,
+	},{
+		/* terminator */
+	}},
+},{
+	.in = "\\h\\\"\a\e\\",
+	.s1 = {{
+		.out = "\\\\h\\\\\"\\a\\e\\\\",
+		.flags = ESCAPE_SPECIAL,
+	},{
+		.out = "\\\\\\150\\\\\\042\\a\\e\\\\",
+		.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL,
+	},{
+		.out = "\\\\\\x68\\\\\\x22\\a\\e\\\\",
+		.flags = ESCAPE_SPECIAL | ESCAPE_HEX,
+	},{
+		/* terminator */
+	}},
+},{
+	.in = "\eb \\C\007\"\x90\r]",
+	.s1 = {{
+		.out = "\eb \\C\007\"\x90\\r]",
+		.flags = ESCAPE_SPACE,
+	},{
+		.out = "\\eb \\\\C\\a\"\x90\r]",
+		.flags = ESCAPE_SPECIAL,
+	},{
+		.out = "\\eb \\\\C\\a\"\x90\\r]",
+		.flags = ESCAPE_SPACE | ESCAPE_SPECIAL,
+	},{
+		.out = "\\033\\142\\040\\134\\103\\007\\042\\220\\015\\135",
+		.flags = ESCAPE_OCTAL,
+	},{
+		.out = "\\033\\142\\040\\134\\103\\007\\042\\220\\r\\135",
+		.flags = ESCAPE_SPACE | ESCAPE_OCTAL,
+	},{
+		.out = "\\e\\142\\040\\\\\\103\\a\\042\\220\\015\\135",
+		.flags = ESCAPE_SPECIAL | ESCAPE_OCTAL,
+	},{
+		.out = "\\e\\142\\040\\\\\\103\\a\\042\\220\\r\\135",
+		.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_OCTAL,
+	},{
+		.out = "\eb \\C\007\"\x90\r]",
+		.flags = ESCAPE_NP,
+	},{
+		.out = "\eb \\C\007\"\x90\\r]",
+		.flags = ESCAPE_SPACE | ESCAPE_NP,
+	},{
+		.out = "\\eb \\C\\a\"\x90\r]",
+		.flags = ESCAPE_SPECIAL | ESCAPE_NP,
+	},{
+		.out = "\\eb \\C\\a\"\x90\\r]",
+		.flags = ESCAPE_SPACE | ESCAPE_SPECIAL | ESCAPE_NP,
+	},{
+		.out = "\\033b \\C\\007\"\\220\\015]",
+		.flags = ESCAPE_OCTAL | ESCAPE_NP,
+	},{
+		.out = "\\033b \\C\\007\"\\220\\r]",
+		.flags = ESCAPE_SPACE | ESCAPE_OCTAL | ESCAPE_NP,
+	},{
+		.out = "\\eb \\C\\a\"\\220\\r]",
+		.flags = ESCAPE_SPECIAL | ESCAPE_SPACE | ESCAPE_OCTAL |
+			 ESCAPE_NP,
+	},{
+		.out = "\\x1bb \\C\\x07\"\\x90\\x0d]",
+		.flags = ESCAPE_NP | ESCAPE_HEX,
+	},{
+		/* terminator */
+	}},
+},{
+	/* terminator */
+}};
+
+#define	TEST_STRING_2_DICT_1		"b\\ \t\r"
+static const struct test_string_2 escape1[] __initconst = {{
+	.in = "\f\\ \n\r\t\v",
+	.s1 = {{
+		.out = "\f\\134\\040\n\\015\\011\v",
+		.flags = ESCAPE_OCTAL,
+	},{
+		.out = "\f\\x5c\\x20\n\\x0d\\x09\v",
+		.flags = ESCAPE_HEX,
+	},{
+		/* terminator */
+	}},
+},{
+	.in = "\\h\\\"\a\e\\",
+	.s1 = {{
+		.out = "\\134h\\134\"\a\e\\134",
+		.flags = ESCAPE_OCTAL,
+	},{
+		/* terminator */
+	}},
+},{
+	.in = "\eb \\C\007\"\x90\r]",
+	.s1 = {{
+		.out = "\e\\142\\040\\134C\007\"\x90\\015]",
+		.flags = ESCAPE_OCTAL,
+	},{
+		/* terminator */
+	}},
+},{
+	/* terminator */
+}};
+
+static __init const char *test_string_find_match(const struct test_string_2 *s2,
+						 unsigned int flags)
+{
+	const struct test_string_1 *s1 = s2->s1;
+	unsigned int i;
+
+	if (!flags)
+		return s2->in;
+
+	/* Test cases are NULL-aware */
+	flags &= ~ESCAPE_NULL;
+
+	/* ESCAPE_OCTAL has a higher priority */
+	if (flags & ESCAPE_OCTAL)
+		flags &= ~ESCAPE_HEX;
+
+	for (i = 0; i < TEST_STRING_2_MAX_S1 && s1->out; i++, s1++)
+		if (s1->flags == flags)
+			return s1->out;
+	return NULL;
+}
+
+static __init void test_string_escape(const char *name,
+				      const struct test_string_2 *s2,
+				      unsigned int flags, const char *esc)
+{
+	char in[256];
+	char out_test[512];
+	char out_real[512], *buf = out_real;
+	int p = 0, q_test = 0, q_real = sizeof(out_real);
+
+	for (; s2->in; s2++) {
+		const char *out;
+		int len;
+
+		/* NULL injection */
+		if (flags & ESCAPE_NULL) {
+			in[p++] = '\0';
+			out_test[q_test++] = '\\';
+			out_test[q_test++] = '0';
+		}
+
+		/* Don't try strings that have no output */
+		out = test_string_find_match(s2, flags);
+		if (!out)
+			continue;
+
+		/* Copy string to in buffer */
+		len = strlen(s2->in);
+		memcpy(&in[p], s2->in, len);
+		p += len;
+
+		/* Copy expected result for given flags */
+		len = strlen(out);
+		memcpy(&out_test[q_test], out, len);
+		q_test += len;
+	}
+
+	q_real = string_escape_mem(in, p, &buf, q_real, flags, esc);
+
+	test_string_check_buf(name, flags, in, p, out_real, q_real, out_test, q_test);
+}
+
+static __init void test_string_escape_nomem(void)
+{
+	char *in = "\eb \\C\007\"\x90\r]";
+	char out[64], *buf = out;
+	int rc = -ENOMEM, ret;
+
+	ret = string_escape_str_any_np(in, &buf, strlen(in), NULL);
+	if (ret == rc)
+		return;
+
+	pr_err("Test 'escape nomem' failed: got %d instead of %d\n", ret, rc);
+}
+
 static int __init test_string_helpers_init(void)
 {
 	unsigned int i;
@@ -112,6 +315,16 @@ static int __init test_string_helpers_init(void)
 	test_string_unescape("unescape inplace",
 			     get_random_int() % (UNESCAPE_ANY + 1), true);
 
+	/* Without dictionary */
+	for (i = 0; i < (ESCAPE_ANY_NP | ESCAPE_HEX) + 1; i++)
+		test_string_escape("escape 0", escape0, i, TEST_STRING_2_DICT_0);
+
+	/* With dictionary */
+	for (i = 0; i < (ESCAPE_ANY_NP | ESCAPE_HEX) + 1; i++)
+		test_string_escape("escape 1", escape1, i, TEST_STRING_2_DICT_1);
+
+	test_string_escape_nomem();
+
 	return -EINVAL;
 }
 module_init(test_string_helpers_init);
-- 
2.0.1

[PATCH v2 04/10] lib/vsprintf: add %*pE[achnops] format specifier

[Andy Shevchenko]

This allows user to print a given buffer as esaped string. The rules applied
accordingly to the mix of the flags provided by additional format letters.

For example, if the given buffer:

	1b 62 20 5c 43 07 22 90 0d 5d

The result strings could be:
	%*pE            "\eb \C\a"\220\r]"
	%*pEhp          "\x1bb \C\x07"\x90\x0d]"
	%*pEa           "\e\142\040\\\103\a\042\220\r\135"

Please, read Documentation/printk-formats.txt and lib/string_helpers.c kernel
documentation to get further information.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Suggested-by: Joe Perches <joe@perches.com>
---
 Documentation/printk-formats.txt | 28 ++++++++++++++++
 lib/vsprintf.c                   | 72 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 100 insertions(+)

diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 3b56a99..e2dc566 100644
--- a/Documentation/printk-formats.txt
+++ b/Documentation/printk-formats.txt
@@ -70,6 +70,34 @@ DMA addresses types dma_addr_t:
 	For printing a dma_addr_t type which can vary based on build options,
 	regardless of the width of the CPU data path. Passed by reference.
 
+Raw buffer as an escaped string:
+
+	%*pE[achnops]
+
+	For printing raw buffer as an escaped string. For the following buffer
+
+		1b 62 20 5c 43 07 22 90 0d 5d
+
+	few examples show how the conversion could be done (the result string
+	without embraced quotes):
+
+		%*pE		"\eb \C\a"\220\r]"
+		%*pEhp		"\x1bb \C\x07"\x90\x0d]"
+		%*pEa		"\e\142\040\\\103\a\042\220\r\135"
+
+	The converion rules are defined by combination of the following flags
+	(see string_escape_mem() kernel documentation for the details):
+		a - ESCAPE_ANY
+		c - ESCAPE_SPECIAL
+		h - ESCAPE_HEX
+		n - ESCAPE_NULL
+		o - ESCAPE_OCTAL
+		p - ESCAPE_NP
+		s - ESCAPE_SPACE
+	By default ESCAPE_ANY_NP is used.
+
+	If field width is ommited the 1 byte only will be escaped.
+
 Raw buffer as a hex string:
 	%*ph	00 01 02  ...  3f
 	%*phC	00:01:02: ... :3f
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 0eced40..6913046 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -33,6 +33,7 @@
 #include <asm/page.h>		/* for PAGE_SIZE */
 #include <asm/sections.h>	/* for dereference_function_descriptor() */
 
+#include <linux/string_helpers.h>
 #include "kstrtox.h"
 
 /**
@@ -1101,6 +1102,63 @@ char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
 }
 
 static noinline_for_stack
+char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
+		     const char *fmt)
+{
+	bool found = true;
+	int count = 1;
+	unsigned int flags = 0;
+	int len;
+
+	if (spec.field_width == 0)
+		/* nothing to print */
+		return buf;
+
+	if (ZERO_OR_NULL_PTR(addr))
+		/* NULL pointer */
+		return string(buf, end, NULL, spec);
+
+	do {
+		switch (fmt[count++]) {
+		case 'a':
+			flags |= ESCAPE_ANY;
+			break;
+		case 'c':
+			flags |= ESCAPE_SPECIAL;
+			break;
+		case 'h':
+			flags |= ESCAPE_HEX;
+			break;
+		case 'n':
+			flags |= ESCAPE_NULL;
+			break;
+		case 'o':
+			flags |= ESCAPE_OCTAL;
+			break;
+		case 'p':
+			flags |= ESCAPE_NP;
+			break;
+		case 's':
+			flags |= ESCAPE_SPACE;
+			break;
+		default:
+			found = false;
+			break;
+		}
+	} while (found);
+
+	if (!flags)
+		flags = ESCAPE_ANY_NP;
+
+	len = spec.field_width < 0 ? 1 : spec.field_width;
+
+	/* Ignore the error. We print as many characters as we can */
+	string_escape_mem(addr, len, &buf, end - buf, flags, NULL);
+
+	return buf;
+}
+
+static noinline_for_stack
 char *uuid_string(char *buf, char *end, const u8 *addr,
 		  struct printf_spec spec, const char *fmt)
 {
@@ -1236,6 +1294,17 @@ int kptr_restrict __read_mostly;
  * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
  * - 'I[6S]c' for IPv6 addresses printed as specified by
  *       http://tools.ietf.org/html/rfc5952
+ * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
+ *                of the following flags (see string_escape_mem() for the
+ *                details):
+ *                  a - ESCAPE_ANY
+ *                  c - ESCAPE_SPECIAL
+ *                  h - ESCAPE_HEX
+ *                  n - ESCAPE_NULL
+ *                  o - ESCAPE_OCTAL
+ *                  p - ESCAPE_NP
+ *                  s - ESCAPE_SPACE
+ *                By default ESCAPE_ANY_NP is used.
  * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
  *       "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
  *       Options for %pU are:
@@ -1337,6 +1406,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 			}}
 		}
 		break;
+	case 'E':
+		return escaped_string(buf, end, ptr, spec, fmt);
 	case 'U':
 		return uuid_string(buf, end, ptr, spec, fmt);
 	case 'V':
@@ -1651,6 +1722,7 @@ qualifier:
  * %piS depending on sa_family of 'struct sockaddr *' print IPv4/IPv6 address
  * %pU[bBlL] print a UUID/GUID in big or little endian using lower or upper
  *   case.
+ * %*pE[achnops] print an escaped buffer
  * %*ph[CDN] a variable-length hex string with a separator (supports up to 64
  *           bytes of the input)
  * %n is ignored
-- 
2.0.1

[PATCH v2 05/10] wireless: libertas: print esaped string via %*pE

[Andy Shevchenko]

Instead of custom approach this allows to print escaped strings via recently
added kernel extension: %*pE.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/net/wireless/libertas/cfg.c  | 8 ++------
 drivers/net/wireless/libertas/mesh.c | 7 +++----
 2 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/libertas/cfg.c b/drivers/net/wireless/libertas/cfg.c
index 47a998d..1188814 100644
--- a/drivers/net/wireless/libertas/cfg.c
+++ b/drivers/net/wireless/libertas/cfg.c
@@ -590,7 +590,6 @@ static int lbs_ret_scan(struct lbs_private *priv, unsigned long dummy,
 		int chan_no = -1;
 		const u8 *ssid = NULL;
 		u8 ssid_len = 0;
-		DECLARE_SSID_BUF(ssid_buf);
 
 		int len = get_unaligned_le16(pos);
 		pos += 2;
@@ -644,10 +643,8 @@ static int lbs_ret_scan(struct lbs_private *priv, unsigned long dummy,
 			struct ieee80211_channel *channel =
 				ieee80211_get_channel(wiphy, freq);
 
-			lbs_deb_scan("scan: %pM, capa %04x, chan %2d, %s, "
-				     "%d dBm\n",
-				     bssid, capa, chan_no,
-				     print_ssid(ssid_buf, ssid, ssid_len),
+			lbs_deb_scan("scan: %pM, capa %04x, chan %2d, %*pE, %d dBm\n",
+				     bssid, capa, chan_no, ssid_len, ssid,
 				     LBS_SCAN_RSSI_TO_MBM(rssi)/100);
 
 			if (channel &&
@@ -1982,7 +1979,6 @@ static int lbs_join_ibss(struct wiphy *wiphy, struct net_device *dev,
 	struct lbs_private *priv = wiphy_priv(wiphy);
 	int ret = 0;
 	struct cfg80211_bss *bss;
-	DECLARE_SSID_BUF(ssid_buf);
 
 	if (dev == priv->mesh_dev)
 		return -EOPNOTSUPP;
diff --git a/drivers/net/wireless/libertas/mesh.c b/drivers/net/wireless/libertas/mesh.c
index 6fef746..b211ff8 100644
--- a/drivers/net/wireless/libertas/mesh.c
+++ b/drivers/net/wireless/libertas/mesh.c
@@ -93,7 +93,6 @@ static int lbs_mesh_config(struct lbs_private *priv, uint16_t action,
 {
 	struct cmd_ds_mesh_config cmd;
 	struct mrvl_meshie *ie;
-	DECLARE_SSID_BUF(ssid);
 
 	memset(&cmd, 0, sizeof(cmd));
 	cmd.channel = cpu_to_le16(chan);
@@ -122,9 +121,9 @@ static int lbs_mesh_config(struct lbs_private *priv, uint16_t action,
 	default:
 		return -1;
 	}
-	lbs_deb_cmd("mesh config action %d type %x channel %d SSID %s\n",
-		    action, priv->mesh_tlv, chan,
-		    print_ssid(ssid, priv->mesh_ssid, priv->mesh_ssid_len));
+	lbs_deb_cmd("mesh config action %d type %x channel %d SSID %*pE\n",
+		    action, priv->mesh_tlv, chan, priv->mesh_ssid_len,
+		    priv->mesh_ssid);
 
 	return __lbs_mesh_config_send(priv, &cmd, action, priv->mesh_tlv);
 }
-- 
2.0.1

[PATCH v2 06/10] wireless: ipw2x00: print SSID via %*pE

[Andy Shevchenko]

Instead of custom approach this allows to print escaped strings via recently
added kernel extension: %*pE.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/net/wireless/ipw2x00/ipw2100.c   |  22 +--
 drivers/net/wireless/ipw2x00/ipw2200.c   | 270 ++++++++++---------------------
 drivers/net/wireless/ipw2x00/libipw_rx.c |  65 +++-----
 drivers/net/wireless/ipw2x00/libipw_wx.c |  16 +-
 4 files changed, 126 insertions(+), 247 deletions(-)

diff --git a/drivers/net/wireless/ipw2x00/ipw2100.c b/drivers/net/wireless/ipw2x00/ipw2100.c
index 1ab8e50..aac2953 100644
--- a/drivers/net/wireless/ipw2x00/ipw2100.c
+++ b/drivers/net/wireless/ipw2x00/ipw2100.c
@@ -2005,7 +2005,6 @@ static void isr_indicate_associated(struct ipw2100_priv *priv, u32 status)
 	u32 chan;
 	char *txratename;
 	u8 bssid[ETH_ALEN];
-	DECLARE_SSID_BUF(ssid);
 
 	/*
 	 * TBD: BSSID is usually 00:00:00:00:00:00 here and not
@@ -2067,8 +2066,8 @@ static void isr_indicate_associated(struct ipw2100_priv *priv, u32 status)
 		break;
 	}
 
-	IPW_DEBUG_INFO("%s: Associated with '%s' at %s, channel %d (BSSID=%pM)\n",
-		       priv->net_dev->name, print_ssid(ssid, essid, essid_len),
+	IPW_DEBUG_INFO("%s: Associated with '%*pE' at %s, channel %d (BSSID=%pM)\n",
+		       priv->net_dev->name, essid_len, essid,
 		       txratename, chan, bssid);
 
 	/* now we copy read ssid into dev */
@@ -2095,9 +2094,8 @@ static int ipw2100_set_essid(struct ipw2100_priv *priv, char *essid,
 		.host_command_length = ssid_len
 	};
 	int err;
-	DECLARE_SSID_BUF(ssid);
 
-	IPW_DEBUG_HC("SSID: '%s'\n", print_ssid(ssid, essid, ssid_len));
+	IPW_DEBUG_HC("SSID: '%*pE'\n", ssid_len, essid);
 
 	if (ssid_len)
 		memcpy(cmd.host_command_parameters, essid, ssid_len);
@@ -2138,11 +2136,8 @@ static int ipw2100_set_essid(struct ipw2100_priv *priv, char *essid,
 
 static void isr_indicate_association_lost(struct ipw2100_priv *priv, u32 status)
 {
-	DECLARE_SSID_BUF(ssid);
-
 	IPW_DEBUG(IPW_DL_NOTIF | IPW_DL_STATE | IPW_DL_ASSOC,
-		  "disassociated: '%s' %pM\n",
-		  print_ssid(ssid, priv->essid, priv->essid_len),
+		  "disassociated: '%*pE' %pM\n", priv->essid_len, priv->essid,
 		  priv->bssid);
 
 	priv->status &= ~(STATUS_ASSOCIATED | STATUS_ASSOCIATING);
@@ -6975,7 +6970,6 @@ static int ipw2100_wx_set_essid(struct net_device *dev,
 	char *essid = "";	/* ANY */
 	int length = 0;
 	int err = 0;
-	DECLARE_SSID_BUF(ssid);
 
 	mutex_lock(&priv->action_mutex);
 	if (!(priv->status & STATUS_INITIALIZED)) {
@@ -7005,8 +6999,7 @@ static int ipw2100_wx_set_essid(struct net_device *dev,
 		goto done;
 	}
 
-	IPW_DEBUG_WX("Setting ESSID: '%s' (%d)\n",
-		     print_ssid(ssid, essid, length), length);
+	IPW_DEBUG_WX("Setting ESSID: '%*pE' (%d)\n", length, essid, length);
 
 	priv->essid_len = length;
 	memcpy(priv->essid, essid, priv->essid_len);
@@ -7027,13 +7020,12 @@ static int ipw2100_wx_get_essid(struct net_device *dev,
 	 */
 
 	struct ipw2100_priv *priv = libipw_priv(dev);
-	DECLARE_SSID_BUF(ssid);
 
 	/* If we are associated, trying to associate, or have a statically
 	 * configured ESSID then return that; otherwise return ANY */
 	if (priv->config & CFG_STATIC_ESSID || priv->status & STATUS_ASSOCIATED) {
-		IPW_DEBUG_WX("Getting essid: '%s'\n",
-			     print_ssid(ssid, priv->essid, priv->essid_len));
+		IPW_DEBUG_WX("Getting essid: '%*pE'\n",
+			     priv->essid_len, priv->essid);
 		memcpy(extra, priv->essid, priv->essid_len);
 		wrqu->essid.length = priv->essid_len;
 		wrqu->essid.flags = 1;	/* active */
diff --git a/drivers/net/wireless/ipw2x00/ipw2200.c b/drivers/net/wireless/ipw2x00/ipw2200.c
index c5aa404..45ee86c 100644
--- a/drivers/net/wireless/ipw2x00/ipw2200.c
+++ b/drivers/net/wireless/ipw2x00/ipw2200.c
@@ -4496,7 +4496,6 @@ static void handle_scan_event(struct ipw_priv *priv)
 static void ipw_rx_notification(struct ipw_priv *priv,
 				       struct ipw_rx_notification *notif)
 {
-	DECLARE_SSID_BUF(ssid);
 	u16 size = le16_to_cpu(notif->size);
 
 	IPW_DEBUG_NOTIF("type = %i (%d bytes)\n", notif->subtype, size);
@@ -4509,9 +4508,8 @@ static void ipw_rx_notification(struct ipw_priv *priv,
 			case CMAS_ASSOCIATED:{
 					IPW_DEBUG(IPW_DL_NOTIF | IPW_DL_STATE |
 						  IPW_DL_ASSOC,
-						  "associated: '%s' %pM\n",
-						  print_ssid(ssid, priv->essid,
-							     priv->essid_len),
+						  "associated: '%*pE' %pM\n",
+						  priv->essid_len, priv->essid,
 						  priv->bssid);
 
 					switch (priv->ieee->iw_mode) {
@@ -4585,14 +4583,9 @@ static void ipw_rx_notification(struct ipw_priv *priv,
 						IPW_DEBUG(IPW_DL_NOTIF |
 							  IPW_DL_STATE |
 							  IPW_DL_ASSOC,
-							  "deauthenticated: '%s' "
-							  "%pM"
-							  ": (0x%04X) - %s\n",
-							  print_ssid(ssid,
-								     priv->
-								     essid,
-								     priv->
-								     essid_len),
+							  "deauthenticated: '%*pE' %pM: (0x%04X) - %s\n",
+							  priv->essid_len,
+							  priv->essid,
 							  priv->bssid,
 							  le16_to_cpu(auth->status),
 							  ipw_get_status_code
@@ -4610,9 +4603,8 @@ static void ipw_rx_notification(struct ipw_priv *priv,
 
 					IPW_DEBUG(IPW_DL_NOTIF | IPW_DL_STATE |
 						  IPW_DL_ASSOC,
-						  "authenticated: '%s' %pM\n",
-						  print_ssid(ssid, priv->essid,
-							     priv->essid_len),
+						  "authenticated: '%*pE' %pM\n",
+						  priv->essid_len, priv->essid,
 						  priv->bssid);
 					break;
 				}
@@ -4638,9 +4630,8 @@ static void ipw_rx_notification(struct ipw_priv *priv,
 
 					IPW_DEBUG(IPW_DL_NOTIF | IPW_DL_STATE |
 						  IPW_DL_ASSOC,
-						  "disassociated: '%s' %pM\n",
-						  print_ssid(ssid, priv->essid,
-							     priv->essid_len),
+						  "disassociated: '%*pE' %pM\n",
+						  priv->essid_len, priv->essid,
 						  priv->bssid);
 
 					priv->status &=
@@ -4676,9 +4667,8 @@ static void ipw_rx_notification(struct ipw_priv *priv,
 			switch (auth->state) {
 			case CMAS_AUTHENTICATED:
 				IPW_DEBUG(IPW_DL_NOTIF | IPW_DL_STATE,
-					  "authenticated: '%s' %pM\n",
-					  print_ssid(ssid, priv->essid,
-						     priv->essid_len),
+					  "authenticated: '%*pE' %pM\n",
+					  priv->essid_len, priv->essid,
 					  priv->bssid);
 				priv->status |= STATUS_AUTH;
 				break;
@@ -4695,9 +4685,8 @@ static void ipw_rx_notification(struct ipw_priv *priv,
 				}
 				IPW_DEBUG(IPW_DL_NOTIF | IPW_DL_STATE |
 					  IPW_DL_ASSOC,
-					  "deauthenticated: '%s' %pM\n",
-					  print_ssid(ssid, priv->essid,
-						     priv->essid_len),
+					  "deauthenticated: '%*pE' %pM\n",
+					  priv->essid_len, priv->essid,
 					  priv->bssid);
 
 				priv->status &= ~(STATUS_ASSOCIATING |
@@ -5516,16 +5505,13 @@ static int ipw_find_adhoc_network(struct ipw_priv *priv,
 				  int roaming)
 {
 	struct ipw_supported_rates rates;
-	DECLARE_SSID_BUF(ssid);
 
 	/* Verify that this network's capability is compatible with the
 	 * current mode (AdHoc or Infrastructure) */
 	if ((priv->ieee->iw_mode == IW_MODE_ADHOC &&
 	     !(network->capability & WLAN_CAPABILITY_IBSS))) {
-		IPW_DEBUG_MERGE("Network '%s (%pM)' excluded due to "
-				"capability mismatch.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_MERGE("Network '%*pE (%pM)' excluded due to capability mismatch.\n",
+				network->ssid_len, network->ssid,
 				network->bssid);
 		return 0;
 	}
@@ -5536,10 +5522,8 @@ static int ipw_find_adhoc_network(struct ipw_priv *priv,
 		if ((network->ssid_len != match->network->ssid_len) ||
 		    memcmp(network->ssid, match->network->ssid,
 			   network->ssid_len)) {
-			IPW_DEBUG_MERGE("Network '%s (%pM)' excluded "
-					"because of non-network ESSID.\n",
-					print_ssid(ssid, network->ssid,
-						   network->ssid_len),
+			IPW_DEBUG_MERGE("Network '%*pE (%pM)' excluded because of non-network ESSID.\n",
+					network->ssid_len, network->ssid,
 					network->bssid);
 			return 0;
 		}
@@ -5550,17 +5534,10 @@ static int ipw_find_adhoc_network(struct ipw_priv *priv,
 		    ((network->ssid_len != priv->essid_len) ||
 		     memcmp(network->ssid, priv->essid,
 			    min(network->ssid_len, priv->essid_len)))) {
-			char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
-
-			strncpy(escaped,
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
-				sizeof(escaped));
-			IPW_DEBUG_MERGE("Network '%s (%pM)' excluded "
-					"because of ESSID mismatch: '%s'.\n",
-					escaped, network->bssid,
-					print_ssid(ssid, priv->essid,
-						   priv->essid_len));
+			IPW_DEBUG_MERGE("Network '%*pE (%pM)' excluded because of ESSID mismatch: '%*pE'.\n",
+					network->ssid_len, network->ssid,
+					network->bssid, priv->essid_len,
+					priv->essid);
 			return 0;
 		}
 	}
@@ -5569,26 +5546,20 @@ static int ipw_find_adhoc_network(struct ipw_priv *priv,
 	 * testing everything else. */
 
 	if (network->time_stamp[0] < match->network->time_stamp[0]) {
-		IPW_DEBUG_MERGE("Network '%s excluded because newer than "
-				"current network.\n",
-				print_ssid(ssid, match->network->ssid,
-					   match->network->ssid_len));
+		IPW_DEBUG_MERGE("Network '%*pE excluded because newer than current network.\n",
+				match->network->ssid_len, match->network->ssid);
 		return 0;
 	} else if (network->time_stamp[1] < match->network->time_stamp[1]) {
-		IPW_DEBUG_MERGE("Network '%s excluded because newer than "
-				"current network.\n",
-				print_ssid(ssid, match->network->ssid,
-					   match->network->ssid_len));
+		IPW_DEBUG_MERGE("Network '%*pE excluded because newer than current network.\n",
+				match->network->ssid_len, match->network->ssid);
 		return 0;
 	}
 
 	/* Now go through and see if the requested network is valid... */
 	if (priv->ieee->scan_age != 0 &&
 	    time_after(jiffies, network->last_scanned + priv->ieee->scan_age)) {
-		IPW_DEBUG_MERGE("Network '%s (%pM)' excluded "
-				"because of age: %ums.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_MERGE("Network '%*pE (%pM)' excluded because of age: %ums.\n",
+				network->ssid_len, network->ssid,
 				network->bssid,
 				jiffies_to_msecs(jiffies -
 						 network->last_scanned));
@@ -5597,10 +5568,8 @@ static int ipw_find_adhoc_network(struct ipw_priv *priv,
 
 	if ((priv->config & CFG_STATIC_CHANNEL) &&
 	    (network->channel != priv->channel)) {
-		IPW_DEBUG_MERGE("Network '%s (%pM)' excluded "
-				"because of channel mismatch: %d != %d.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_MERGE("Network '%*pE (%pM)' excluded because of channel mismatch: %d != %d.\n",
+				network->ssid_len, network->ssid,
 				network->bssid,
 				network->channel, priv->channel);
 		return 0;
@@ -5609,10 +5578,8 @@ static int ipw_find_adhoc_network(struct ipw_priv *priv,
 	/* Verify privacy compatibility */
 	if (((priv->capability & CAP_PRIVACY_ON) ? 1 : 0) !=
 	    ((network->capability & WLAN_CAPABILITY_PRIVACY) ? 1 : 0)) {
-		IPW_DEBUG_MERGE("Network '%s (%pM)' excluded "
-				"because of privacy mismatch: %s != %s.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_MERGE("Network '%*pE (%pM)' excluded because of privacy mismatch: %s != %s.\n",
+				network->ssid_len, network->ssid,
 				network->bssid,
 				priv->
 				capability & CAP_PRIVACY_ON ? "on" : "off",
@@ -5623,22 +5590,16 @@ static int ipw_find_adhoc_network(struct ipw_priv *priv,
 	}
 
 	if (ether_addr_equal(network->bssid, priv->bssid)) {
-		IPW_DEBUG_MERGE("Network '%s (%pM)' excluded "
-				"because of the same BSSID match: %pM"
-				".\n", print_ssid(ssid, network->ssid,
-						  network->ssid_len),
-				network->bssid,
-				priv->bssid);
+		IPW_DEBUG_MERGE("Network '%*pE (%pM)' excluded because of the same BSSID match: %pM.\n",
+				network->ssid_len, network->ssid,
+				network->bssid, priv->bssid);
 		return 0;
 	}
 
 	/* Filter out any incompatible freq / mode combinations */
 	if (!libipw_is_valid_mode(priv->ieee, network->mode)) {
-		IPW_DEBUG_MERGE("Network '%s (%pM)' excluded "
-				"because of invalid frequency/mode "
-				"combination.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_MERGE("Network '%*pE (%pM)' excluded because of invalid frequency/mode combination.\n",
+				network->ssid_len, network->ssid,
 				network->bssid);
 		return 0;
 	}
@@ -5646,20 +5607,15 @@ static int ipw_find_adhoc_network(struct ipw_priv *priv,
 	/* Ensure that the rates supported by the driver are compatible with
 	 * this AP, including verification of basic rates (mandatory) */
 	if (!ipw_compatible_rates(priv, network, &rates)) {
-		IPW_DEBUG_MERGE("Network '%s (%pM)' excluded "
-				"because configured rate mask excludes "
-				"AP mandatory rate.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_MERGE("Network '%*pE (%pM)' excluded because configured rate mask excludes AP mandatory rate.\n",
+				network->ssid_len, network->ssid,
 				network->bssid);
 		return 0;
 	}
 
 	if (rates.num_rates == 0) {
-		IPW_DEBUG_MERGE("Network '%s (%pM)' excluded "
-				"because of no compatible rates.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_MERGE("Network '%*pE (%pM)' excluded because of no compatible rates.\n",
+				network->ssid_len, network->ssid,
 				network->bssid);
 		return 0;
 	}
@@ -5671,16 +5627,14 @@ static int ipw_find_adhoc_network(struct ipw_priv *priv,
 	/* Set up 'new' AP to this network */
 	ipw_copy_rates(&match->rates, &rates);
 	match->network = network;
-	IPW_DEBUG_MERGE("Network '%s (%pM)' is a viable match.\n",
-			print_ssid(ssid, network->ssid, network->ssid_len),
-			network->bssid);
+	IPW_DEBUG_MERGE("Network '%*pE (%pM)' is a viable match.\n",
+			network->ssid_len, network->ssid, network->bssid);
 
 	return 1;
 }
 
 static void ipw_merge_adhoc_network(struct work_struct *work)
 {
-	DECLARE_SSID_BUF(ssid);
 	struct ipw_priv *priv =
 		container_of(work, struct ipw_priv, merge_networks);
 	struct libipw_network *network = NULL;
@@ -5710,9 +5664,8 @@ static void ipw_merge_adhoc_network(struct work_struct *work)
 
 		mutex_lock(&priv->mutex);
 		if ((priv->ieee->iw_mode == IW_MODE_ADHOC)) {
-			IPW_DEBUG_MERGE("remove network %s\n",
-					print_ssid(ssid, priv->essid,
-						   priv->essid_len));
+			IPW_DEBUG_MERGE("remove network %*pE\n",
+					priv->essid_len, priv->essid);
 			ipw_remove_current_network(priv);
 		}
 
@@ -5728,7 +5681,6 @@ static int ipw_best_network(struct ipw_priv *priv,
 			    struct libipw_network *network, int roaming)
 {
 	struct ipw_supported_rates rates;
-	DECLARE_SSID_BUF(ssid);
 
 	/* Verify that this network's capability is compatible with the
 	 * current mode (AdHoc or Infrastructure) */
@@ -5736,10 +5688,8 @@ static int ipw_best_network(struct ipw_priv *priv,
 	     !(network->capability & WLAN_CAPABILITY_ESS)) ||
 	    (priv->ieee->iw_mode == IW_MODE_ADHOC &&
 	     !(network->capability & WLAN_CAPABILITY_IBSS))) {
-		IPW_DEBUG_ASSOC("Network '%s (%pM)' excluded due to "
-				"capability mismatch.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_ASSOC("Network '%*pE (%pM)' excluded due to capability mismatch.\n",
+				network->ssid_len, network->ssid,
 				network->bssid);
 		return 0;
 	}
@@ -5750,10 +5700,8 @@ static int ipw_best_network(struct ipw_priv *priv,
 		if ((network->ssid_len != match->network->ssid_len) ||
 		    memcmp(network->ssid, match->network->ssid,
 			   network->ssid_len)) {
-			IPW_DEBUG_ASSOC("Network '%s (%pM)' excluded "
-					"because of non-network ESSID.\n",
-					print_ssid(ssid, network->ssid,
-						   network->ssid_len),
+			IPW_DEBUG_ASSOC("Network '%*pE (%pM)' excluded because of non-network ESSID.\n",
+					network->ssid_len, network->ssid,
 					network->bssid);
 			return 0;
 		}
@@ -5764,16 +5712,10 @@ static int ipw_best_network(struct ipw_priv *priv,
 		    ((network->ssid_len != priv->essid_len) ||
 		     memcmp(network->ssid, priv->essid,
 			    min(network->ssid_len, priv->essid_len)))) {
-			char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
-			strncpy(escaped,
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
-				sizeof(escaped));
-			IPW_DEBUG_ASSOC("Network '%s (%pM)' excluded "
-					"because of ESSID mismatch: '%s'.\n",
-					escaped, network->bssid,
-					print_ssid(ssid, priv->essid,
-						   priv->essid_len));
+			IPW_DEBUG_ASSOC("Network '%*pE (%pM)' excluded because of ESSID mismatch: '%*pE'.\n",
+					network->ssid_len, network->ssid,
+					network->bssid, priv->essid_len,
+					priv->essid);
 			return 0;
 		}
 	}
@@ -5781,16 +5723,10 @@ static int ipw_best_network(struct ipw_priv *priv,
 	/* If the old network rate is better than this one, don't bother
 	 * testing everything else. */
 	if (match->network && match->network->stats.rssi > network->stats.rssi) {
-		char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
-		strncpy(escaped,
-			print_ssid(ssid, network->ssid, network->ssid_len),
-			sizeof(escaped));
-		IPW_DEBUG_ASSOC("Network '%s (%pM)' excluded because "
-				"'%s (%pM)' has a stronger signal.\n",
-				escaped, network->bssid,
-				print_ssid(ssid, match->network->ssid,
-					   match->network->ssid_len),
-				match->network->bssid);
+		IPW_DEBUG_ASSOC("Network '%*pE (%pM)' excluded because '%*pE (%pM)' has a stronger signal.\n",
+				network->ssid_len, network->ssid,
+				network->bssid, match->network->ssid_len,
+				match->network->ssid, match->network->bssid);
 		return 0;
 	}
 
@@ -5798,11 +5734,8 @@ static int ipw_best_network(struct ipw_priv *priv,
 	 * last 3 seconds, do not try and associate again... */
 	if (network->last_associate &&
 	    time_after(network->last_associate + (HZ * 3UL), jiffies)) {
-		IPW_DEBUG_ASSOC("Network '%s (%pM)' excluded "
-				"because of storming (%ums since last "
-				"assoc attempt).\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_ASSOC("Network '%*pE (%pM)' excluded because of storming (%ums since last assoc attempt).\n",
+				network->ssid_len, network->ssid,
 				network->bssid,
 				jiffies_to_msecs(jiffies -
 						 network->last_associate));
@@ -5812,10 +5745,8 @@ static int ipw_best_network(struct ipw_priv *priv,
 	/* Now go through and see if the requested network is valid... */
 	if (priv->ieee->scan_age != 0 &&
 	    time_after(jiffies, network->last_scanned + priv->ieee->scan_age)) {
-		IPW_DEBUG_ASSOC("Network '%s (%pM)' excluded "
-				"because of age: %ums.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_ASSOC("Network '%*pE (%pM)' excluded because of age: %ums.\n",
+				network->ssid_len, network->ssid,
 				network->bssid,
 				jiffies_to_msecs(jiffies -
 						 network->last_scanned));
@@ -5824,10 +5755,8 @@ static int ipw_best_network(struct ipw_priv *priv,
 
 	if ((priv->config & CFG_STATIC_CHANNEL) &&
 	    (network->channel != priv->channel)) {
-		IPW_DEBUG_ASSOC("Network '%s (%pM)' excluded "
-				"because of channel mismatch: %d != %d.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_ASSOC("Network '%*pE (%pM)' excluded because of channel mismatch: %d != %d.\n",
+				network->ssid_len, network->ssid,
 				network->bssid,
 				network->channel, priv->channel);
 		return 0;
@@ -5836,10 +5765,8 @@ static int ipw_best_network(struct ipw_priv *priv,
 	/* Verify privacy compatibility */
 	if (((priv->capability & CAP_PRIVACY_ON) ? 1 : 0) !=
 	    ((network->capability & WLAN_CAPABILITY_PRIVACY) ? 1 : 0)) {
-		IPW_DEBUG_ASSOC("Network '%s (%pM)' excluded "
-				"because of privacy mismatch: %s != %s.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_ASSOC("Network '%*pE (%pM)' excluded because of privacy mismatch: %s != %s.\n",
+				network->ssid_len, network->ssid,
 				network->bssid,
 				priv->capability & CAP_PRIVACY_ON ? "on" :
 				"off",
@@ -5850,31 +5777,24 @@ static int ipw_best_network(struct ipw_priv *priv,
 
 	if ((priv->config & CFG_STATIC_BSSID) &&
 	    !ether_addr_equal(network->bssid, priv->bssid)) {
-		IPW_DEBUG_ASSOC("Network '%s (%pM)' excluded "
-				"because of BSSID mismatch: %pM.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_ASSOC("Network '%*pE (%pM)' excluded because of BSSID mismatch: %pM.\n",
+				network->ssid_len, network->ssid,
 				network->bssid, priv->bssid);
 		return 0;
 	}
 
 	/* Filter out any incompatible freq / mode combinations */
 	if (!libipw_is_valid_mode(priv->ieee, network->mode)) {
-		IPW_DEBUG_ASSOC("Network '%s (%pM)' excluded "
-				"because of invalid frequency/mode "
-				"combination.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_ASSOC("Network '%*pE (%pM)' excluded because of invalid frequency/mode combination.\n",
+				network->ssid_len, network->ssid,
 				network->bssid);
 		return 0;
 	}
 
 	/* Filter out invalid channel in current GEO */
 	if (!libipw_is_valid_channel(priv->ieee, network->channel)) {
-		IPW_DEBUG_ASSOC("Network '%s (%pM)' excluded "
-				"because of invalid channel in current GEO\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_ASSOC("Network '%*pE (%pM)' excluded because of invalid channel in current GEO\n",
+				network->ssid_len, network->ssid,
 				network->bssid);
 		return 0;
 	}
@@ -5882,20 +5802,15 @@ static int ipw_best_network(struct ipw_priv *priv,
 	/* Ensure that the rates supported by the driver are compatible with
 	 * this AP, including verification of basic rates (mandatory) */
 	if (!ipw_compatible_rates(priv, network, &rates)) {
-		IPW_DEBUG_ASSOC("Network '%s (%pM)' excluded "
-				"because configured rate mask excludes "
-				"AP mandatory rate.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_ASSOC("Network '%*pE (%pM)' excluded because configured rate mask excludes AP mandatory rate.\n",
+				network->ssid_len, network->ssid,
 				network->bssid);
 		return 0;
 	}
 
 	if (rates.num_rates == 0) {
-		IPW_DEBUG_ASSOC("Network '%s (%pM)' excluded "
-				"because of no compatible rates.\n",
-				print_ssid(ssid, network->ssid,
-					   network->ssid_len),
+		IPW_DEBUG_ASSOC("Network '%*pE (%pM)' excluded because of no compatible rates.\n",
+				network->ssid_len, network->ssid,
 				network->bssid);
 		return 0;
 	}
@@ -5908,9 +5823,8 @@ static int ipw_best_network(struct ipw_priv *priv,
 	ipw_copy_rates(&match->rates, &rates);
 	match->network = network;
 
-	IPW_DEBUG_ASSOC("Network '%s (%pM)' is a viable match.\n",
-			print_ssid(ssid, network->ssid, network->ssid_len),
-			network->bssid);
+	IPW_DEBUG_ASSOC("Network '%*pE (%pM)' is a viable match.\n",
+			network->ssid_len, network->ssid, network->bssid);
 
 	return 1;
 }
@@ -6152,7 +6066,6 @@ static void ipw_bg_adhoc_check(struct work_struct *work)
 
 static void ipw_debug_config(struct ipw_priv *priv)
 {
-	DECLARE_SSID_BUF(ssid);
 	IPW_DEBUG_INFO("Scan completed, no valid APs matched "
 		       "[CFG 0x%08X]\n", priv->config);
 	if (priv->config & CFG_STATIC_CHANNEL)
@@ -6160,8 +6073,8 @@ static void ipw_debug_config(struct ipw_priv *priv)
 	else
 		IPW_DEBUG_INFO("Channel unlocked.\n");
 	if (priv->config & CFG_STATIC_ESSID)
-		IPW_DEBUG_INFO("ESSID locked to '%s'\n",
-			       print_ssid(ssid, priv->essid, priv->essid_len));
+		IPW_DEBUG_INFO("ESSID locked to '%*pE'\n",
+			       priv->essid_len, priv->essid);
 	else
 		IPW_DEBUG_INFO("ESSID unlocked.\n");
 	if (priv->config & CFG_STATIC_BSSID)
@@ -7385,7 +7298,6 @@ static int ipw_associate_network(struct ipw_priv *priv,
 				 struct ipw_supported_rates *rates, int roaming)
 {
 	int err;
-	DECLARE_SSID_BUF(ssid);
 
 	if (priv->config & CFG_FIXED_RATE)
 		ipw_set_fixed_rate(priv, network->mode);
@@ -7451,10 +7363,9 @@ static int ipw_associate_network(struct ipw_priv *priv,
 		priv->assoc_request.capability &=
 		    ~cpu_to_le16(WLAN_CAPABILITY_SHORT_SLOT_TIME);
 
-	IPW_DEBUG_ASSOC("%ssociation attempt: '%s', channel %d, "
-			"802.11%c [%d], %s[:%s], enc=%s%s%s%c%c\n",
+	IPW_DEBUG_ASSOC("%ssociation attempt: '%*pE', channel %d, 802.11%c [%d], %s[:%s], enc=%s%s%s%c%c\n",
 			roaming ? "Rea" : "A",
-			print_ssid(ssid, priv->essid, priv->essid_len),
+			priv->essid_len, priv->essid,
 			network->channel,
 			ipw_modes[priv->assoc_request.ieee_mode],
 			rates->num_rates,
@@ -7553,9 +7464,8 @@ static int ipw_associate_network(struct ipw_priv *priv,
 		return err;
 	}
 
-	IPW_DEBUG(IPW_DL_STATE, "associating: '%s' %pM\n",
-		  print_ssid(ssid, priv->essid, priv->essid_len),
-		  priv->bssid);
+	IPW_DEBUG(IPW_DL_STATE, "associating: '%*pE' %pM\n",
+		  priv->essid_len, priv->essid, priv->bssid);
 
 	return 0;
 }
@@ -7645,7 +7555,6 @@ static int ipw_associate(void *data)
 	struct ipw_supported_rates *rates;
 	struct list_head *element;
 	unsigned long flags;
-	DECLARE_SSID_BUF(ssid);
 
 	if (priv->ieee->iw_mode == IW_MODE_MONITOR) {
 		IPW_DEBUG_ASSOC("Not attempting association (monitor mode)\n");
@@ -7704,10 +7613,8 @@ static int ipw_associate(void *data)
 			/* If there are no more slots, expire the oldest */
 			list_del(&oldest->list);
 			target = oldest;
-			IPW_DEBUG_ASSOC("Expired '%s' (%pM) from "
-					"network list.\n",
-					print_ssid(ssid, target->ssid,
-						   target->ssid_len),
+			IPW_DEBUG_ASSOC("Expired '%*pE' (%pM) from network list.\n",
+					target->ssid_len, target->ssid,
 					target->bssid);
 			list_add_tail(&target->list,
 				      &priv->ieee->network_free_list);
@@ -9093,7 +9000,6 @@ static int ipw_wx_set_essid(struct net_device *dev,
 {
 	struct ipw_priv *priv = libipw_priv(dev);
         int length;
-	DECLARE_SSID_BUF(ssid);
 
         mutex_lock(&priv->mutex);
 
@@ -9118,8 +9024,7 @@ static int ipw_wx_set_essid(struct net_device *dev,
 		return 0;
 	}
 
-	IPW_DEBUG_WX("Setting ESSID: '%s' (%d)\n",
-		     print_ssid(ssid, extra, length), length);
+	IPW_DEBUG_WX("Setting ESSID: '%*pE' (%d)\n", length, extra, length);
 
 	priv->essid_len = length;
 	memcpy(priv->essid, extra, priv->essid_len);
@@ -9138,15 +9043,14 @@ static int ipw_wx_get_essid(struct net_device *dev,
 			    union iwreq_data *wrqu, char *extra)
 {
 	struct ipw_priv *priv = libipw_priv(dev);
-	DECLARE_SSID_BUF(ssid);
 
 	/* If we are associated, trying to associate, or have a statically
 	 * configured ESSID then return that; otherwise return ANY */
 	mutex_lock(&priv->mutex);
 	if (priv->config & CFG_STATIC_ESSID ||
 	    priv->status & (STATUS_ASSOCIATED | STATUS_ASSOCIATING)) {
-		IPW_DEBUG_WX("Getting essid: '%s'\n",
-			     print_ssid(ssid, priv->essid, priv->essid_len));
+		IPW_DEBUG_WX("Getting essid: '%*pE'\n",
+			     priv->essid_len, priv->essid);
 		memcpy(extra, priv->essid, priv->essid_len);
 		wrqu->essid.length = priv->essid_len;
 		wrqu->essid.flags = 1;	/* active */
diff --git a/drivers/net/wireless/ipw2x00/libipw_rx.c b/drivers/net/wireless/ipw2x00/libipw_rx.c
index a586a85..2d66984 100644
--- a/drivers/net/wireless/ipw2x00/libipw_rx.c
+++ b/drivers/net/wireless/ipw2x00/libipw_rx.c
@@ -1120,7 +1120,6 @@ static int libipw_parse_info_param(struct libipw_info_element
 				      *info_element, u16 length,
 				      struct libipw_network *network)
 {
-	DECLARE_SSID_BUF(ssid);
 	u8 i;
 #ifdef CONFIG_LIBIPW_DEBUG
 	char rates_str[64];
@@ -1151,10 +1150,9 @@ static int libipw_parse_info_param(struct libipw_info_element
 				memset(network->ssid + network->ssid_len, 0,
 				       IW_ESSID_MAX_SIZE - network->ssid_len);
 
-			LIBIPW_DEBUG_MGMT("WLAN_EID_SSID: '%s' len=%d.\n",
-					     print_ssid(ssid, network->ssid,
-							network->ssid_len),
-					     network->ssid_len);
+			LIBIPW_DEBUG_MGMT("WLAN_EID_SSID: '%*pE' len=%d.\n",
+					  network->ssid_len, network->ssid,
+					  network->ssid_len);
 			break;
 
 		case WLAN_EID_SUPP_RATES:
@@ -1399,8 +1397,6 @@ static int libipw_network_init(struct libipw_device *ieee, struct libipw_probe_r
 					 struct libipw_network *network,
 					 struct libipw_rx_stats *stats)
 {
-	DECLARE_SSID_BUF(ssid);
-
 	network->qos_data.active = 0;
 	network->qos_data.supported = 0;
 	network->qos_data.param_count = 0;
@@ -1447,11 +1443,9 @@ static int libipw_network_init(struct libipw_device *ieee, struct libipw_probe_r
 	}
 
 	if (network->mode == 0) {
-		LIBIPW_DEBUG_SCAN("Filtered out '%s (%pM)' "
-				     "network.\n",
-				     print_ssid(ssid, network->ssid,
-						 network->ssid_len),
-				     network->bssid);
+		LIBIPW_DEBUG_SCAN("Filtered out '%*pE (%pM)' network.\n",
+				  network->ssid_len, network->ssid,
+				  network->bssid);
 		return 1;
 	}
 
@@ -1563,11 +1557,9 @@ static void libipw_process_probe_response(struct libipw_device
 	struct libipw_info_element *info_element = beacon->info_element;
 #endif
 	unsigned long flags;
-	DECLARE_SSID_BUF(ssid);
 
-	LIBIPW_DEBUG_SCAN("'%s' (%pM"
-		     "): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
-		     print_ssid(ssid, info_element->data, info_element->len),
+	LIBIPW_DEBUG_SCAN("'%*pE' (%pM): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
+		     info_element->len, info_element->data,
 		     beacon->header.addr3,
 		     (beacon->capability & cpu_to_le16(1 << 0xf)) ? '1' : '0',
 		     (beacon->capability & cpu_to_le16(1 << 0xe)) ? '1' : '0',
@@ -1587,12 +1579,11 @@ static void libipw_process_probe_response(struct libipw_device
 		     (beacon->capability & cpu_to_le16(1 << 0x0)) ? '1' : '0');
 
 	if (libipw_network_init(ieee, beacon, &network, stats)) {
-		LIBIPW_DEBUG_SCAN("Dropped '%s' (%pM) via %s.\n",
-				     print_ssid(ssid, info_element->data,
-						 info_element->len),
-				     beacon->header.addr3,
-				     is_beacon(beacon->header.frame_ctl) ?
-				     "BEACON" : "PROBE RESPONSE");
+		LIBIPW_DEBUG_SCAN("Dropped '%*pE' (%pM) via %s.\n",
+				  info_element->len, info_element->data,
+				  beacon->header.addr3,
+				  is_beacon(beacon->header.frame_ctl) ?
+				  "BEACON" : "PROBE RESPONSE");
 		return;
 	}
 
@@ -1624,11 +1615,9 @@ static void libipw_process_probe_response(struct libipw_device
 			/* If there are no more slots, expire the oldest */
 			list_del(&oldest->list);
 			target = oldest;
-			LIBIPW_DEBUG_SCAN("Expired '%s' (%pM) from "
-					     "network list.\n",
-					     print_ssid(ssid, target->ssid,
-							 target->ssid_len),
-					     target->bssid);
+			LIBIPW_DEBUG_SCAN("Expired '%*pE' (%pM) from network list.\n",
+					  target->ssid_len, target->ssid,
+					  target->bssid);
 			libipw_network_reset(target);
 		} else {
 			/* Otherwise just pull from the free list */
@@ -1638,23 +1627,21 @@ static void libipw_process_probe_response(struct libipw_device
 		}
 
 #ifdef CONFIG_LIBIPW_DEBUG
-		LIBIPW_DEBUG_SCAN("Adding '%s' (%pM) via %s.\n",
-				     print_ssid(ssid, network.ssid,
-						 network.ssid_len),
-				     network.bssid,
-				     is_beacon(beacon->header.frame_ctl) ?
-				     "BEACON" : "PROBE RESPONSE");
+		LIBIPW_DEBUG_SCAN("Adding '%*pE' (%pM) via %s.\n",
+				  network.ssid_len, network.ssid,
+				  network.bssid,
+				  is_beacon(beacon->header.frame_ctl) ?
+				  "BEACON" : "PROBE RESPONSE");
 #endif
 		memcpy(target, &network, sizeof(*target));
 		network.ibss_dfs = NULL;
 		list_add_tail(&target->list, &ieee->network_list);
 	} else {
-		LIBIPW_DEBUG_SCAN("Updating '%s' (%pM) via %s.\n",
-				     print_ssid(ssid, target->ssid,
-						 target->ssid_len),
-				     target->bssid,
-				     is_beacon(beacon->header.frame_ctl) ?
-				     "BEACON" : "PROBE RESPONSE");
+		LIBIPW_DEBUG_SCAN("Updating '%*pE' (%pM) via %s.\n",
+				  target->ssid_len, target->ssid,
+				  target->bssid,
+				  is_beacon(beacon->header.frame_ctl) ?
+				  "BEACON" : "PROBE RESPONSE");
 		update_network(target, &network);
 		network.ibss_dfs = NULL;
 	}
diff --git a/drivers/net/wireless/ipw2x00/libipw_wx.c b/drivers/net/wireless/ipw2x00/libipw_wx.c
index 54aba47..dd29f46 100644
--- a/drivers/net/wireless/ipw2x00/libipw_wx.c
+++ b/drivers/net/wireless/ipw2x00/libipw_wx.c
@@ -272,7 +272,6 @@ int libipw_wx_get_scan(struct libipw_device *ieee,
 	char *ev = extra;
 	char *stop = ev + wrqu->data.length;
 	int i = 0;
-	DECLARE_SSID_BUF(ssid);
 
 	LIBIPW_DEBUG_WX("Getting scan\n");
 
@@ -290,12 +289,10 @@ int libipw_wx_get_scan(struct libipw_device *ieee,
 			ev = libipw_translate_scan(ieee, ev, stop, network,
 						      info);
 		else {
-			LIBIPW_DEBUG_SCAN("Not showing network '%s ("
-					     "%pM)' due to age (%ums).\n",
-					     print_ssid(ssid, network->ssid,
-							 network->ssid_len),
-					     network->bssid,
-					     elapsed_jiffies_msecs(
+			LIBIPW_DEBUG_SCAN("Not showing network '%*pE (%pM)' due to age (%ums).\n",
+					  network->ssid_len, network->ssid,
+					  network->bssid,
+					  elapsed_jiffies_msecs(
 					               network->last_scanned));
 		}
 	}
@@ -322,7 +319,6 @@ int libipw_wx_set_encode(struct libipw_device *ieee,
 	int i, key, key_provided, len;
 	struct lib80211_crypt_data **crypt;
 	int host_crypto = ieee->host_encrypt || ieee->host_decrypt;
-	DECLARE_SSID_BUF(ssid);
 
 	LIBIPW_DEBUG_WX("SET_ENCODE\n");
 
@@ -417,8 +413,8 @@ int libipw_wx_set_encode(struct libipw_device *ieee,
 		if (len > erq->length)
 			memset(sec.keys[key] + erq->length, 0,
 			       len - erq->length);
-		LIBIPW_DEBUG_WX("Setting key %d to '%s' (%d:%d bytes)\n",
-				   key, print_ssid(ssid, sec.keys[key], len),
+		LIBIPW_DEBUG_WX("Setting key %d to '%*pE' (%d:%d bytes)\n",
+				   key, len, sec.keys[key],
 				   erq->length, len);
 		sec.key_sizes[key] = len;
 		if (*crypt)
-- 
2.0.1

[PATCH v2 07/10] lib80211: remove unused print_ssid()

[Andy Shevchenko]

In kernel we have %*pE specifier to print an escaped buffer. All users now
switched to that approach.

This fixes a bug as well. The current implementation wrongly prints octal
numbers: only two first digits are used in case when 3 are required and the
rest of the string ends up cut off.

Additionally by default the \f, \v, \a, and \e are escaped to their alphabetic
representation. It's safe to do since it is currently used for messaging only.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 include/net/lib80211.h  |  5 -----
 net/wireless/lib80211.c | 32 --------------------------------
 2 files changed, 37 deletions(-)

diff --git a/include/net/lib80211.h b/include/net/lib80211.h
index be95b92..aab0f42 100644
--- a/include/net/lib80211.h
+++ b/include/net/lib80211.h
@@ -32,11 +32,6 @@
 #include <linux/timer.h>
 #include <linux/seq_file.h>
 
-/* print_ssid() is intended to be used in debug (and possibly error)
- * messages. It should never be used for passing ssid to user space. */
-const char *print_ssid(char *buf, const char *ssid, u8 ssid_len);
-#define DECLARE_SSID_BUF(var) char var[IEEE80211_MAX_SSID_LEN * 4 + 1] __maybe_unused
-
 #define NUM_WEP_KEYS	4
 
 enum {
diff --git a/net/wireless/lib80211.c b/net/wireless/lib80211.c
index a55c27b..4596115 100644
--- a/net/wireless/lib80211.c
+++ b/net/wireless/lib80211.c
@@ -46,38 +46,6 @@ static void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info,
 static void lib80211_crypt_quiescing(struct lib80211_crypt_info *info);
 static void lib80211_crypt_deinit_handler(unsigned long data);
 
-const char *print_ssid(char *buf, const char *ssid, u8 ssid_len)
-{
-	const char *s = ssid;
-	char *d = buf;
-
-	ssid_len = min_t(u8, ssid_len, IEEE80211_MAX_SSID_LEN);
-	while (ssid_len--) {
-		if (isprint(*s)) {
-			*d++ = *s++;
-			continue;
-		}
-
-		*d++ = '\\';
-		if (*s == '\0')
-			*d++ = '0';
-		else if (*s == '\n')
-			*d++ = 'n';
-		else if (*s == '\r')
-			*d++ = 'r';
-		else if (*s == '\t')
-			*d++ = 't';
-		else if (*s == '\\')
-			*d++ = '\\';
-		else
-			d += snprintf(d, 3, "%03o", *s);
-		s++;
-	}
-	*d = '\0';
-	return buf;
-}
-EXPORT_SYMBOL(print_ssid);
-
 int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name,
 				spinlock_t *lock)
 {
-- 
2.0.1

[PATCH v2 08/10] staging: wlan-ng: use %*pEhp to print SN

[Andy Shevchenko]

This is a generic specifier to print an escaped buffer by given criteria. Let's
use it instead of custom approach.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/staging/wlan-ng/prism2sta.c | 28 ++--------------------------
 1 file changed, 2 insertions(+), 26 deletions(-)

diff --git a/drivers/staging/wlan-ng/prism2sta.c b/drivers/staging/wlan-ng/prism2sta.c
index 209e4db..688e827 100644
--- a/drivers/staging/wlan-ng/prism2sta.c
+++ b/drivers/staging/wlan-ng/prism2sta.c
@@ -60,7 +60,6 @@
 #include <linux/netdevice.h>
 #include <linux/workqueue.h>
 #include <linux/byteorder/generic.h>
-#include <linux/ctype.h>
 
 #include <linux/io.h>
 #include <linux/delay.h>
@@ -81,27 +80,6 @@
 #include "hfa384x.h"
 #include "prism2mgmt.h"
 
-/* Create a string of printable chars from something that might not be */
-/* It's recommended that the str be 4*len + 1 bytes long */
-#define wlan_mkprintstr(buf, buflen, str, strlen) \
-{ \
-	int i = 0; \
-	int j = 0; \
-	memset(str, 0, (strlen)); \
-	for (i = 0; i < (buflen); i++) { \
-		if (isprint((buf)[i])) { \
-			(str)[j] = (buf)[i]; \
-			j++; \
-		} else { \
-			(str)[j] = '\\'; \
-			(str)[j+1] = 'x'; \
-			(str)[j+2] = hex_asc_hi((buf)[i]); \
-			(str)[j+3] = hex_asc_lo((buf)[i]); \
-			j += 4; \
-		} \
-	} \
-}
-
 static char *dev_info = "prism2_usb";
 static wlandevice_t *create_wlan(void);
 
@@ -607,7 +585,6 @@ static int prism2sta_getcardinfo(wlandevice_t *wlandev)
 	hfa384x_t *hw = (hfa384x_t *) wlandev->priv;
 	u16 temp;
 	u8 snum[HFA384x_RID_NICSERIALNUMBER_LEN];
-	char pstr[(HFA384x_RID_NICSERIALNUMBER_LEN * 4) + 1];
 
 	/* Collect version and compatibility info */
 	/*  Some are critical, some are not */
@@ -862,9 +839,8 @@ static int prism2sta_getcardinfo(wlandevice_t *wlandev)
 	result = hfa384x_drvr_getconfig(hw, HFA384x_RID_NICSERIALNUMBER,
 					snum, HFA384x_RID_NICSERIALNUMBER_LEN);
 	if (!result) {
-		wlan_mkprintstr(snum, HFA384x_RID_NICSERIALNUMBER_LEN,
-				pstr, sizeof(pstr));
-		netdev_info(wlandev->netdev, "Prism2 card SN: %s\n", pstr);
+		netdev_info(wlandev->netdev, "Prism2 card SN: %*pEhp\n",
+			    HFA384x_RID_NICSERIALNUMBER_LEN, snum);
 	} else {
 		netdev_err(wlandev->netdev, "Failed to retrieve Prism2 Card SN\n");
 		goto failed;
-- 
2.0.1

[PATCH v2 09/10] staging: rtl8192e: use %*pEn to escape buffer

[Andy Shevchenko]

Let's use kernel's native specifier to escape a buffer.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/staging/rtl8192e/rtllib.h | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/drivers/staging/rtl8192e/rtllib.h b/drivers/staging/rtl8192e/rtllib.h
index 83f5f57..9840be0 100644
--- a/drivers/staging/rtl8192e/rtllib.h
+++ b/drivers/staging/rtl8192e/rtllib.h
@@ -2956,25 +2956,13 @@ extern inline int rtllib_get_scans(struct rtllib_device *ieee)
 static inline const char *escape_essid(const char *essid, u8 essid_len)
 {
 	static char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
-	const char *s = essid;
-	char *d = escaped;
 
 	if (rtllib_is_empty_essid(essid, essid_len)) {
 		memcpy(escaped, "<hidden>", sizeof("<hidden>"));
 		return escaped;
 	}
 
-	essid_len = min(essid_len, (u8)IW_ESSID_MAX_SIZE);
-	while (essid_len--) {
-		if (*s == '\0') {
-			*d++ = '\\';
-			*d++ = '0';
-			s++;
-		} else {
-			*d++ = *s++;
-		}
-	}
-	*d = '\0';
+	snprintf(escaped, sizeof(escaped), "%*pEn", essid_len, essid);
 	return escaped;
 }
 
-- 
2.0.1

[PATCH v2 10/10] staging: rtl8192u: use %*pEn to escape buffer

[Andy Shevchenko]

Let's use kernel's native specifier to escape a buffer.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/staging/rtl8192u/ieee80211/ieee80211.h | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211.h b/drivers/staging/rtl8192u/ieee80211/ieee80211.h
index 1040bab..1a265f9 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211.h
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211.h
@@ -2576,25 +2576,13 @@ static inline int ieee80211_get_scans(struct ieee80211_device *ieee)
 
 static inline const char *escape_essid(const char *essid, u8 essid_len) {
 	static char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
-	const char *s = essid;
-	char *d = escaped;
 
 	if (ieee80211_is_empty_essid(essid, essid_len)) {
 		memcpy(escaped, "<hidden>", sizeof("<hidden>"));
 		return escaped;
 	}
 
-	essid_len = min(essid_len, (u8)IW_ESSID_MAX_SIZE);
-	while (essid_len--) {
-		if (*s == '\0') {
-			*d++ = '\\';
-			*d++ = '0';
-			s++;
-		} else {
-			*d++ = *s++;
-		}
-	}
-	*d = '\0';
+	snprintf(escaped, sizeof(escaped), "%*pEn", essid_len, essid);
 	return escaped;
 }
 
-- 
2.0.1

Re: [PATCH v2 04/10] lib/vsprintf: add %*pE[achnops] format specifier

[Joe Perches]

[trivial notes]

On Mon, 2014-07-07 at 18:21 +0300, Andy Shevchenko wrote:
> This allows user to print a given buffer as esaped string. The rules applied

as an escaped

> accordingly to the mix of the flags provided by additional format letters.

rules are applied according to an optional mix of flags

> For example, if the given buffer:
> 
> 	1b 62 20 5c 43 07 22 90 0d 5d
> 
> The result strings could be:

would be

> 	%*pE            "\eb \C\a"\220\r]"

Maybe say something about ssid's here.
or maybe add an %*pES just for the ssid type.

> diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
[]
> @@ -70,6 +70,34 @@ DMA addresses types dma_addr_t:
>  	For printing a dma_addr_t type which can vary based on build options,
>  	regardless of the width of the CPU data path. Passed by reference.
>  
> +Raw buffer as an escaped string:
> +
> +	%*pE[achnops]
> +
> +	For printing raw buffer as an escaped string. For the following buffer
> +
> +		1b 62 20 5c 43 07 22 90 0d 5d
> +
> +	few examples show how the conversion could be done (the result string
> +	without embraced quotes):

'embraced' is a bit of an awkward word choice.  Maybe surrounding.

> +
> +		%*pE		"\eb \C\a"\220\r]"

Oh, the initial commit log comments above are really for this block

> +		%*pEhp		"\x1bb \C\x07"\x90\x0d]"
> +		%*pEa		"\e\142\040\\\103\a\042\220\r\135"
> +
> +	The converion rules are defined by combination of the following flags

conversion

> +	(see string_escape_mem() kernel documentation for the details):
> +		a - ESCAPE_ANY
> +		c - ESCAPE_SPECIAL
> +		h - ESCAPE_HEX
> +		n - ESCAPE_NULL
> +		o - ESCAPE_OCTAL
> +		p - ESCAPE_NP
> +		s - ESCAPE_SPACE
> +	By default ESCAPE_ANY_NP is used.
> +
> +	If field width is ommited the 1 byte only will be escaped.

omitted

Re: [PATCH v2 04/10] lib/vsprintf: add %*pE[achnops] format specifier

[Joe Perches]

On Mon, 2014-07-07 at 18:21 +0300, Andy Shevchenko wrote:

> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
[]
>  static noinline_for_stack
> +char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
> +		     const char *fmt)
[]
> +	if (spec.field_width == 0)
> +		/* nothing to print */
> +		return buf;
[]
> +	len = spec.field_width < 0 ? 1 : spec.field_width;

If field_width is not specified, emit a single byte?

Perhaps better if -1 was accepted by string_escape_mem
as a strlen request or just ignored as a 0 length is
above.

fyi: hex_string emits nothing on printk("%ph", buf);

Re: [PATCH v2 04/10] lib/vsprintf: add %*pE[achnops] format specifier

[Andy Shevchenko]

On Mon, 2014-07-07 at 09:50 -0700, Joe Perches wrote:
> On Mon, 2014-07-07 at 18:21 +0300, Andy Shevchenko wrote:
> 
> > diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> []
> >  static noinline_for_stack
> > +char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
> > +		     const char *fmt)
> []
> > +	if (spec.field_width == 0)
> > +		/* nothing to print */
> > +		return buf;
> []
> > +	len = spec.field_width < 0 ? 1 : spec.field_width;
> 
> If field_width is not specified, emit a single byte?

A single byte to be escaped (it might be \000, for example, on output).

> Perhaps better if -1 was accepted by string_escape_mem
> as a strlen request or just ignored as a 0 length is
> above.

Would it be any benefit here?

> fyi: hex_string emits nothing on printk("%ph", buf);

Works just fine. How did you check it?

pr_info("%ph\n", in); => test_string_helpers: 1b

(I suppose "\n" flushes a buffer for me.)

-- 
Andy Shevchenko <andriy.shevchenko@intel.com>
Intel Finland Oy

Re: [PATCH v2 04/10] lib/vsprintf: add %*pE[achnops] format specifier

[Andy Shevchenko]

On Mon, 2014-07-07 at 09:25 -0700, Joe Perches wrote:
> [trivial notes]

Thanks! Fixed locally, though am waiting for few more days if any other
comment comes.

> 
> On Mon, 2014-07-07 at 18:21 +0300, Andy Shevchenko wrote:
> > This allows user to print a given buffer as esaped string. The rules applied
> 
> as an escaped
> 
> > accordingly to the mix of the flags provided by additional format letters.
> 
> rules are applied according to an optional mix of flags
> 
> > For example, if the given buffer:
> > 
> > 	1b 62 20 5c 43 07 22 90 0d 5d
> > 
> > The result strings could be:
> 
> would be
> 
> > 	%*pE            "\eb \C\a"\220\r]"
> 
> Maybe say something about ssid's here.

Mentioned in the printk-formats.txt part.

> or maybe add an %*pES just for the ssid type.

I gave a thought to it, and it seems to me we will increase complexity
of the code to get none beneficial. The SSID in most cases has a
variable-length, thus we will pass it anyway, what else could be differ
here? Default set of flags?

> 
> > diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
> []
> > @@ -70,6 +70,34 @@ DMA addresses types dma_addr_t:
> >  	For printing a dma_addr_t type which can vary based on build options,
> >  	regardless of the width of the CPU data path. Passed by reference.
> >  
> > +Raw buffer as an escaped string:
> > +
> > +	%*pE[achnops]
> > +
> > +	For printing raw buffer as an escaped string. For the following buffer
> > +
> > +		1b 62 20 5c 43 07 22 90 0d 5d
> > +
> > +	few examples show how the conversion could be done (the result string
> > +	without embraced quotes):
> 
> 'embraced' is a bit of an awkward word choice.  Maybe surrounding.
> 
> > +
> > +		%*pE		"\eb \C\a"\220\r]"
> 
> Oh, the initial commit log comments above are really for this block

Phrasing is a bit different, though I rephrased above sentence.

> 
> > +		%*pEhp		"\x1bb \C\x07"\x90\x0d]"
> > +		%*pEa		"\e\142\040\\\103\a\042\220\r\135"
> > +
> > +	The converion rules are defined by combination of the following flags
> 
> conversion
> 
> > +	(see string_escape_mem() kernel documentation for the details):
> > +		a - ESCAPE_ANY
> > +		c - ESCAPE_SPECIAL
> > +		h - ESCAPE_HEX
> > +		n - ESCAPE_NULL
> > +		o - ESCAPE_OCTAL
> > +		p - ESCAPE_NP
> > +		s - ESCAPE_SPACE
> > +	By default ESCAPE_ANY_NP is used.
> > +
> > +	If field width is ommited the 1 byte only will be escaped.
> 
> omitted
> 
> 


-- 
Andy Shevchenko <andriy.shevchenko@intel.com>
Intel Finland Oy

Re: [PATCH v2 04/10] lib/vsprintf: add %*pE[achnops] format specifier

[Joe Perches]

On Tue, 2014-07-08 at 11:24 +0300, Andy Shevchenko wrote:
> On Mon, 2014-07-07 at 09:50 -0700, Joe Perches wrote:
> > Perhaps better if -1 was accepted by string_escape_mem
> > as a strlen request or just ignored as a 0 length is
> > above.
> 
> Would it be any benefit here?

Dunno, it was just a thought for you.

> > fyi: hex_string emits nothing on printk("%ph", buf);
> 
> Works just fine. How did you check it?

By not reading the code correctly.
So what you have is fine.