[linux-block.git] / lib / hexdump.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * lib/hexdump.c
 */

#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/minmax.h>
#include <linux/export.h>
#include <asm/unaligned.h>

const char hex_asc[] = "0123456789abcdef";
EXPORT_SYMBOL(hex_asc);
const char hex_asc_upper[] = "0123456789ABCDEF";
EXPORT_SYMBOL(hex_asc_upper);

/**
 * hex_to_bin - convert a hex digit to its real value
 * @ch: ascii character represents hex digit
 *
 * hex_to_bin() converts one hex digit to its actual value or -1 in case of bad
 * input.
 *
 * This function is used to load cryptographic keys, so it is coded in such a
 * way that there are no conditions or memory accesses that depend on data.
 *
 * Explanation of the logic:
 * (ch - '9' - 1) is negative if ch <= '9'
 * ('0' - 1 - ch) is negative if ch >= '0'
 * we "and" these two values, so the result is negative if ch is in the range
 *	'0' ... '9'
 * we are only interested in the sign, so we do a shift ">> 8"; note that right
 *	shift of a negative value is implementation-defined, so we cast the
 *	value to (unsigned) before the shift --- we have 0xffffff if ch is in
 *	the range '0' ... '9', 0 otherwise
 * we "and" this value with (ch - '0' + 1) --- we have a value 1 ... 10 if ch is
 *	in the range '0' ... '9', 0 otherwise
 * we add this value to -1 --- we have a value 0 ... 9 if ch is in the range '0'
 *	... '9', -1 otherwise
 * the next line is similar to the previous one, but we need to decode both
 *	uppercase and lowercase letters, so we use (ch & 0xdf), which converts
 *	lowercase to uppercase
 */
int hex_to_bin(unsigned char ch)
{
	unsigned char cu = ch & 0xdf;
	return -1 +
		((ch - '0' +  1) & (unsigned)((ch - '9' - 1) & ('0' - 1 - ch)) >> 8) +
		((cu - 'A' + 11) & (unsigned)((cu - 'F' - 1) & ('A' - 1 - cu)) >> 8);
}
EXPORT_SYMBOL(hex_to_bin);

/**
 * hex2bin - convert an ascii hexadecimal string to its binary representation
 * @dst: binary result
 * @src: ascii hexadecimal string
 * @count: result length
 *
 * Return 0 on success, -EINVAL in case of bad input.
 */
int hex2bin(u8 *dst, const char *src, size_t count)
{
	while (count--) {
		int hi, lo;

		hi = hex_to_bin(*src++);
		if (unlikely(hi < 0))
			return -EINVAL;
		lo = hex_to_bin(*src++);
		if (unlikely(lo < 0))
			return -EINVAL;

		*dst++ = (hi << 4) | lo;
	}
	return 0;
}
EXPORT_SYMBOL(hex2bin);

/**
 * bin2hex - convert binary data to an ascii hexadecimal string
 * @dst: ascii hexadecimal result
 * @src: binary data
 * @count: binary data length
 */
char *bin2hex(char *dst, const void *src, size_t count)
{
	const unsigned char *_src = src;

	while (count--)
		dst = hex_byte_pack(dst, *_src++);
	return dst;
}
EXPORT_SYMBOL(bin2hex);

/**
 * hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory
 * @buf: data blob to dump
 * @len: number of bytes in the @buf
 * @rowsize: number of bytes to print per line; must be 16 or 32
 * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
 * @linebuf: where to put the converted data
 * @linebuflen: total size of @linebuf, including space for terminating NUL
 * @ascii: include ASCII after the hex output
 *
 * hex_dump_to_buffer() works on one "line" of output at a time, i.e.,
 * 16 or 32 bytes of input data converted to hex + ASCII output.
 *
 * Given a buffer of u8 data, hex_dump_to_buffer() converts the input data
 * to a hex + ASCII dump at the supplied memory location.
 * The converted output is always NUL-terminated.
 *
 * E.g.:
 *   hex_dump_to_buffer(frame->data, frame->len, 16, 1,
 *			linebuf, sizeof(linebuf), true);
 *
 * example output buffer:
 * 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f  @ABCDEFGHIJKLMNO
 *
 * Return:
 * The amount of bytes placed in the buffer without terminating NUL. If the
 * output was truncated, then the return value is the number of bytes
 * (excluding the terminating NUL) which would have been written to the final
 * string if enough space had been available.
 */
int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
		       char *linebuf, size_t linebuflen, bool ascii)
{
	const u8 *ptr = buf;
	int ngroups;
	u8 ch;
	int j, lx = 0;
	int ascii_column;
	int ret;

	if (rowsize != 16 && rowsize != 32)
		rowsize = 16;

	if (len > rowsize)		/* limit to one line at a time */
		len = rowsize;
	if (!is_power_of_2(groupsize) || groupsize > 8)
		groupsize = 1;
	if ((len % groupsize) != 0)	/* no mixed size output */
		groupsize = 1;

	ngroups = len / groupsize;
	ascii_column = rowsize * 2 + rowsize / groupsize + 1;

	if (!linebuflen)
		goto overflow1;

	if (!len)
		goto nil;

	if (groupsize == 8) {
		const u64 *ptr8 = buf;

		for (j = 0; j < ngroups; j++) {
			ret = snprintf(linebuf + lx, linebuflen - lx,
				       "%s%16.16llx", j ? " " : "",
				       get_unaligned(ptr8 + j));
			if (ret >= linebuflen - lx)
				goto overflow1;
			lx += ret;
		}
	} else if (groupsize == 4) {
		const u32 *ptr4 = buf;

		for (j = 0; j < ngroups; j++) {
			ret = snprintf(linebuf + lx, linebuflen - lx,
				       "%s%8.8x", j ? " " : "",
				       get_unaligned(ptr4 + j));
			if (ret >= linebuflen - lx)
				goto overflow1;
			lx += ret;
		}
	} else if (groupsize == 2) {
		const u16 *ptr2 = buf;

		for (j = 0; j < ngroups; j++) {
			ret = snprintf(linebuf + lx, linebuflen - lx,
				       "%s%4.4x", j ? " " : "",
				       get_unaligned(ptr2 + j));
			if (ret >= linebuflen - lx)
				goto overflow1;
			lx += ret;
		}
	} else {
		for (j = 0; j < len; j++) {
			if (linebuflen < lx + 2)
				goto overflow2;
			ch = ptr[j];
			linebuf[lx++] = hex_asc_hi(ch);
			if (linebuflen < lx + 2)
				goto overflow2;
			linebuf[lx++] = hex_asc_lo(ch);
			if (linebuflen < lx + 2)
				goto overflow2;
			linebuf[lx++] = ' ';
		}
		if (j)
			lx--;
	}
	if (!ascii)
		goto nil;

	while (lx < ascii_column) {
		if (linebuflen < lx + 2)
			goto overflow2;
		linebuf[lx++] = ' ';
	}
	for (j = 0; j < len; j++) {
		if (linebuflen < lx + 2)
			goto overflow2;
		ch = ptr[j];
		linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.';
	}
nil:
	linebuf[lx] = '\0';
	return lx;
overflow2:
	linebuf[lx++] = '\0';
overflow1:
	return ascii ? ascii_column + len : (groupsize * 2 + 1) * ngroups - 1;
}
EXPORT_SYMBOL(hex_dump_to_buffer);

#ifdef CONFIG_PRINTK
/**
 * print_hex_dump - print a text hex dump to syslog for a binary blob of data
 * @level: kernel log level (e.g. KERN_DEBUG)
 * @prefix_str: string to prefix each line with;
 *  caller supplies trailing spaces for alignment if desired
 * @prefix_type: controls whether prefix of an offset, address, or none
 *  is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
 * @rowsize: number of bytes to print per line; must be 16 or 32
 * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
 * @buf: data blob to dump
 * @len: number of bytes in the @buf
 * @ascii: include ASCII after the hex output
 *
 * Given a buffer of u8 data, print_hex_dump() prints a hex + ASCII dump
 * to the kernel log at the specified kernel log level, with an optional
 * leading prefix.
 *
 * print_hex_dump() works on one "line" of output at a time, i.e.,
 * 16 or 32 bytes of input data converted to hex + ASCII output.
 * print_hex_dump() iterates over the entire input @buf, breaking it into
 * "line size" chunks to format and print.
 *
 * E.g.:
 *   print_hex_dump(KERN_DEBUG, "raw data: ", DUMP_PREFIX_ADDRESS,
 *		    16, 1, frame->data, frame->len, true);
 *
 * Example output using %DUMP_PREFIX_OFFSET and 1-byte mode:
 * 0009ab42: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f  @ABCDEFGHIJKLMNO
 * Example output using %DUMP_PREFIX_ADDRESS and 4-byte mode:
 * ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c  pqrstuvwxyz{|}~.
 */
void print_hex_dump(const char *level, const char *prefix_str, int prefix_type,
		    int rowsize, int groupsize,
		    const void *buf, size_t len, bool ascii)
{
	const u8 *ptr = buf;
	int i, linelen, remaining = len;
	unsigned char linebuf[32 * 3 + 2 + 32 + 1];

	if (rowsize != 16 && rowsize != 32)
		rowsize = 16;

	for (i = 0; i < len; i += rowsize) {
		linelen = min(remaining, rowsize);
		remaining -= rowsize;

		hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
				   linebuf, sizeof(linebuf), ascii);

		switch (prefix_type) {
		case DUMP_PREFIX_ADDRESS:
			printk("%s%s%p: %s\n",
			       level, prefix_str, ptr + i, linebuf);
			break;
		case DUMP_PREFIX_OFFSET:
			printk("%s%s%.8x: %s\n", level, prefix_str, i, linebuf);
			break;
		default:
			printk("%s%s%s\n", level, prefix_str, linebuf);
			break;
		}
	}
}
EXPORT_SYMBOL(print_hex_dump);

#endif /* defined(CONFIG_PRINTK) */
Commit	Line	Data
21042e41	1	// SPDX-License-Identifier: GPL-2.0-only
99eaf3c4 RD	2	/*
99eaf3c4 RD	3	* lib/hexdump.c
99eaf3c4 RD	4	*/
	5
	6	#include <linux/types.h>
	7	#include <linux/ctype.h>
9888a588	8	#include <linux/errno.h>
99eaf3c4	9	#include <linux/kernel.h>
b296a6d5	10	#include <linux/minmax.h>
8bc3bcc9	11	#include <linux/export.h>
0f70fe60	12	#include <asm/unaligned.h>
99eaf3c4	13
3fc95772 HH	14	const char hex_asc[] = "0123456789abcdef";
3fc95772 HH	15	EXPORT_SYMBOL(hex_asc);
c26d436c AN	16	const char hex_asc_upper[] = "0123456789ABCDEF";
c26d436c AN	17	EXPORT_SYMBOL(hex_asc_upper);
3fc95772	18
90378889 AS	19	/**
	20	* hex_to_bin - convert a hex digit to its real value
	21	* @ch: ascii character represents hex digit
	22	*
	23	* hex_to_bin() converts one hex digit to its actual value or -1 in case of bad
	24	* input.
e5be1576 MP	25	*
	26	* This function is used to load cryptographic keys, so it is coded in such a
	27	* way that there are no conditions or memory accesses that depend on data.
	28	*
	29	* Explanation of the logic:
	30	* (ch - '9' - 1) is negative if ch <= '9'
	31	* ('0' - 1 - ch) is negative if ch >= '0'
	32	* we "and" these two values, so the result is negative if ch is in the range
	33	* '0' ... '9'
	34	* we are only interested in the sign, so we do a shift ">> 8"; note that right
	35	* shift of a negative value is implementation-defined, so we cast the
	36	* value to (unsigned) before the shift --- we have 0xffffff if ch is in
	37	* the range '0' ... '9', 0 otherwise
	38	* we "and" this value with (ch - '0' + 1) --- we have a value 1 ... 10 if ch is
	39	* in the range '0' ... '9', 0 otherwise
	40	* we add this value to -1 --- we have a value 0 ... 9 if ch is in the range '0'
	41	* ... '9', -1 otherwise
	42	* the next line is similar to the previous one, but we need to decode both
	43	* uppercase and lowercase letters, so we use (ch & 0xdf), which converts
	44	* lowercase to uppercase
90378889	45	*/
e5be1576	46	int hex_to_bin(unsigned char ch)
90378889	47	{
e5be1576 MP	48	unsigned char cu = ch & 0xdf;
	49	return -1 +
	50	((ch - '0' + 1) & (unsigned)((ch - '9' - 1) & ('0' - 1 - ch)) >> 8) +
	51	((cu - 'A' + 11) & (unsigned)((cu - 'F' - 1) & ('A' - 1 - cu)) >> 8);
90378889 AS	52	}
	53	EXPORT_SYMBOL(hex_to_bin);
	54
dc88e460 MZ	55	/**
	56	* hex2bin - convert an ascii hexadecimal string to its binary representation
	57	* @dst: binary result
	58	* @src: ascii hexadecimal string
	59	* @count: result length
b7804983	60	*
9888a588	61	* Return 0 on success, -EINVAL in case of bad input.
dc88e460	62	*/
b7804983	63	int hex2bin(u8 dst, const char src, size_t count)
dc88e460 MZ	64	{
dc88e460 MZ	65	while (count--) {
e4d8a299	66	int hi, lo;
b7804983	67
e4d8a299 MP	68	hi = hex_to_bin(*src++);
	69	if (unlikely(hi < 0))
	70	return -EINVAL;
	71	lo = hex_to_bin(*src++);
	72	if (unlikely(lo < 0))
9888a588	73	return -EINVAL;
b7804983 MZ	74
b7804983 MZ	75	*dst++ = (hi << 4) \| lo;
dc88e460	76	}
b7804983	77	return 0;
dc88e460 MZ	78	}
	79	EXPORT_SYMBOL(hex2bin);
	80
53d91c5c DH	81	/**
	82	* bin2hex - convert binary data to an ascii hexadecimal string
	83	* @dst: ascii hexadecimal result
	84	* @src: binary data
	85	* @count: binary data length
	86	*/
	87	char bin2hex(char dst, const void *src, size_t count)
	88	{
	89	const unsigned char *_src = src;
	90
	91	while (count--)
	92	dst = hex_byte_pack(dst, *_src++);
	93	return dst;
	94	}
	95	EXPORT_SYMBOL(bin2hex);
	96
99eaf3c4 RD	97	/**
	98	* hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory
	99	* @buf: data blob to dump
	100	* @len: number of bytes in the @buf
c7909234 RD	101	* @rowsize: number of bytes to print per line; must be 16 or 32
c7909234 RD	102	* @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
99eaf3c4 RD	103	* @linebuf: where to put the converted data
99eaf3c4 RD	104	* @linebuflen: total size of @linebuf, including space for terminating NUL
c7909234	105	* @ascii: include ASCII after the hex output
99eaf3c4 RD	106	*
99eaf3c4 RD	107	* hex_dump_to_buffer() works on one "line" of output at a time, i.e.,
c7909234	108	* 16 or 32 bytes of input data converted to hex + ASCII output.
99eaf3c4 RD	109	*
	110	* Given a buffer of u8 data, hex_dump_to_buffer() converts the input data
	111	* to a hex + ASCII dump at the supplied memory location.
	112	* The converted output is always NUL-terminated.
	113	*
	114	* E.g.:
c7909234	115	* hex_dump_to_buffer(frame->data, frame->len, 16, 1,
db0fd97c	116	* linebuf, sizeof(linebuf), true);
99eaf3c4 RD	117	*
99eaf3c4 RD	118	* example output buffer:
c7909234	119	* 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO
114fc1af AS	120	*
	121	* Return:
	122	* The amount of bytes placed in the buffer without terminating NUL. If the
	123	* output was truncated, then the return value is the number of bytes
	124	* (excluding the terminating NUL) which would have been written to the final
	125	* string if enough space had been available.
99eaf3c4	126	*/
114fc1af AS	127	int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
114fc1af AS	128	char *linebuf, size_t linebuflen, bool ascii)
99eaf3c4 RD	129	{
99eaf3c4 RD	130	const u8 *ptr = buf;
5d909c8d	131	int ngroups;
99eaf3c4 RD	132	u8 ch;
99eaf3c4 RD	133	int j, lx = 0;
c7909234	134	int ascii_column;
114fc1af	135	int ret;
99eaf3c4	136
c7909234 RD	137	if (rowsize != 16 && rowsize != 32)
	138	rowsize = 16;
	139
c7909234 RD	140	if (len > rowsize) /* limit to one line at a time */
c7909234 RD	141	len = rowsize;
5d909c8d AS	142	if (!is_power_of_2(groupsize) \|\| groupsize > 8)
5d909c8d AS	143	groupsize = 1;
c7909234 RD	144	if ((len % groupsize) != 0) /* no mixed size output */
	145	groupsize = 1;
	146
5d909c8d AS	147	ngroups = len / groupsize;
5d909c8d AS	148	ascii_column = rowsize * 2 + rowsize / groupsize + 1;
114fc1af AS	149
	150	if (!linebuflen)
	151	goto overflow1;
	152
	153	if (!len)
	154	goto nil;
	155
5d909c8d	156	if (groupsize == 8) {
c7909234	157	const u64 *ptr8 = buf;
c7909234	158
114fc1af AS	159	for (j = 0; j < ngroups; j++) {
	160	ret = snprintf(linebuf + lx, linebuflen - lx,
	161	"%s%16.16llx", j ? " " : "",
0f70fe60	162	get_unaligned(ptr8 + j));
114fc1af AS	163	if (ret >= linebuflen - lx)
	164	goto overflow1;
	165	lx += ret;
	166	}
5d909c8d	167	} else if (groupsize == 4) {
c7909234	168	const u32 *ptr4 = buf;
c7909234	169
114fc1af AS	170	for (j = 0; j < ngroups; j++) {
	171	ret = snprintf(linebuf + lx, linebuflen - lx,
	172	"%s%8.8x", j ? " " : "",
0f70fe60	173	get_unaligned(ptr4 + j));
114fc1af AS	174	if (ret >= linebuflen - lx)
	175	goto overflow1;
	176	lx += ret;
	177	}
5d909c8d	178	} else if (groupsize == 2) {
c7909234	179	const u16 *ptr2 = buf;
c7909234	180
114fc1af AS	181	for (j = 0; j < ngroups; j++) {
	182	ret = snprintf(linebuf + lx, linebuflen - lx,
	183	"%s%4.4x", j ? " " : "",
0f70fe60	184	get_unaligned(ptr2 + j));
114fc1af AS	185	if (ret >= linebuflen - lx)
	186	goto overflow1;
	187	lx += ret;
	188	}
5d909c8d	189	} else {
114fc1af	190	for (j = 0; j < len; j++) {
9f029f54	191	if (linebuflen < lx + 2)
114fc1af	192	goto overflow2;
c7909234	193	ch = ptr[j];
3fc95772	194	linebuf[lx++] = hex_asc_hi(ch);
9f029f54 AS	195	if (linebuflen < lx + 2)
9f029f54 AS	196	goto overflow2;
3fc95772	197	linebuf[lx++] = hex_asc_lo(ch);
9f029f54 AS	198	if (linebuflen < lx + 2)
9f029f54 AS	199	goto overflow2;
99eaf3c4	200	linebuf[lx++] = ' ';
c7909234	201	}
c67ae69b LZ	202	if (j)
c67ae69b LZ	203	lx--;
99eaf3c4	204	}
c7909234 RD	205	if (!ascii)
	206	goto nil;
	207
114fc1af AS	208	while (lx < ascii_column) {
	209	if (linebuflen < lx + 2)
	210	goto overflow2;
99eaf3c4	211	linebuf[lx++] = ' ';
114fc1af AS	212	}
	213	for (j = 0; j < len; j++) {
	214	if (linebuflen < lx + 2)
	215	goto overflow2;
db0fd97c JP	216	ch = ptr[j];
	217	linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.';
	218	}
c7909234	219	nil:
114fc1af AS	220	linebuf[lx] = '\0';
	221	return lx;
	222	overflow2:
99eaf3c4	223	linebuf[lx++] = '\0';
114fc1af AS	224	overflow1:
114fc1af AS	225	return ascii ? ascii_column + len : (groupsize * 2 + 1) * ngroups - 1;
99eaf3c4 RD	226	}
	227	EXPORT_SYMBOL(hex_dump_to_buffer);
	228
ac83ed68	229	#ifdef CONFIG_PRINTK
99eaf3c4 RD	230	/**
	231	* print_hex_dump - print a text hex dump to syslog for a binary blob of data
	232	* @level: kernel log level (e.g. KERN_DEBUG)
c7909234 RD	233	* @prefix_str: string to prefix each line with;
c7909234 RD	234	* caller supplies trailing spaces for alignment if desired
99eaf3c4 RD	235	* @prefix_type: controls whether prefix of an offset, address, or none
99eaf3c4 RD	236	* is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
c7909234 RD	237	* @rowsize: number of bytes to print per line; must be 16 or 32
c7909234 RD	238	* @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
99eaf3c4 RD	239	* @buf: data blob to dump
99eaf3c4 RD	240	* @len: number of bytes in the @buf
c7909234	241	* @ascii: include ASCII after the hex output
99eaf3c4 RD	242	*
	243	* Given a buffer of u8 data, print_hex_dump() prints a hex + ASCII dump
	244	* to the kernel log at the specified kernel log level, with an optional
	245	* leading prefix.
	246	*
c7909234 RD	247	* print_hex_dump() works on one "line" of output at a time, i.e.,
	248	* 16 or 32 bytes of input data converted to hex + ASCII output.
	249	* print_hex_dump() iterates over the entire input @buf, breaking it into
	250	* "line size" chunks to format and print.
	251	*
99eaf3c4	252	* E.g.:
c7909234	253	* print_hex_dump(KERN_DEBUG, "raw data: ", DUMP_PREFIX_ADDRESS,
db0fd97c	254	* 16, 1, frame->data, frame->len, true);
99eaf3c4	255	*
c7909234 RD	256	* Example output using %DUMP_PREFIX_OFFSET and 1-byte mode:
	257	* 0009ab42: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO
	258	* Example output using %DUMP_PREFIX_ADDRESS and 4-byte mode:
	259	* ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c pqrstuvwxyz{\|}~.
99eaf3c4	260	*/
c7909234	261	void print_hex_dump(const char level, const char prefix_str, int prefix_type,
db0fd97c JP	262	int rowsize, int groupsize,
db0fd97c JP	263	const void *buf, size_t len, bool ascii)
99eaf3c4	264	{
6a0ed91e	265	const u8 *ptr = buf;
99eaf3c4	266	int i, linelen, remaining = len;
db0fd97c	267	unsigned char linebuf[32 * 3 + 2 + 32 + 1];
99eaf3c4	268
c7909234 RD	269	if (rowsize != 16 && rowsize != 32)
	270	rowsize = 16;
	271
	272	for (i = 0; i < len; i += rowsize) {
	273	linelen = min(remaining, rowsize);
	274	remaining -= rowsize;
db0fd97c	275
c7909234	276	hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
db0fd97c	277	linebuf, sizeof(linebuf), ascii);
99eaf3c4 RD	278
	279	switch (prefix_type) {
	280	case DUMP_PREFIX_ADDRESS:
db0fd97c JP	281	printk("%s%s%p: %s\n",
db0fd97c JP	282	level, prefix_str, ptr + i, linebuf);
99eaf3c4 RD	283	break;
99eaf3c4 RD	284	case DUMP_PREFIX_OFFSET:
c7909234	285	printk("%s%s%.8x: %s\n", level, prefix_str, i, linebuf);
99eaf3c4 RD	286	break;
99eaf3c4 RD	287	default:
c7909234	288	printk("%s%s%s\n", level, prefix_str, linebuf);
99eaf3c4 RD	289	break;
	290	}
	291	}
	292	}
	293	EXPORT_SYMBOL(print_hex_dump);
c7909234	294
7a555613	295	#endif /* defined(CONFIG_PRINTK) */