mirror of https://gitee.com/openkylin/linux.git
105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
/*
|
|
* lib/hexdump.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation. See README and COPYING for
|
|
* more details.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
|
|
/**
|
|
* 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
|
|
* @linebuf: where to put the converted data
|
|
* @linebuflen: total size of @linebuf, including space for terminating NUL
|
|
*
|
|
* hex_dump_to_buffer() works on one "line" of output at a time, i.e.,
|
|
* 16 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, linebuf, sizeof(linebuf));
|
|
*
|
|
* example output buffer:
|
|
* 40414243 44454647 48494a4b 4c4d4e4f @ABCDEFGHIJKLMNO
|
|
*/
|
|
void hex_dump_to_buffer(const void *buf, size_t len, char *linebuf,
|
|
size_t linebuflen)
|
|
{
|
|
const u8 *ptr = buf;
|
|
u8 ch;
|
|
int j, lx = 0;
|
|
|
|
for (j = 0; (j < 16) && (j < len) && (lx + 3) < linebuflen; j++) {
|
|
if (j && !(j % 4))
|
|
linebuf[lx++] = ' ';
|
|
ch = ptr[j];
|
|
linebuf[lx++] = hex_asc(ch >> 4);
|
|
linebuf[lx++] = hex_asc(ch & 0x0f);
|
|
}
|
|
if ((lx + 2) < linebuflen) {
|
|
linebuf[lx++] = ' ';
|
|
linebuf[lx++] = ' ';
|
|
}
|
|
for (j = 0; (j < 16) && (j < len) && (lx + 2) < linebuflen; j++)
|
|
linebuf[lx++] = isprint(ptr[j]) ? ptr[j] : '.';
|
|
linebuf[lx++] = '\0';
|
|
}
|
|
EXPORT_SYMBOL(hex_dump_to_buffer);
|
|
|
|
/**
|
|
* 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_type: controls whether prefix of an offset, address, or none
|
|
* is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
|
|
* @buf: data blob to dump
|
|
* @len: number of bytes in the @buf
|
|
*
|
|
* 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.
|
|
*
|
|
* E.g.:
|
|
* print_hex_dump(KERN_DEBUG, DUMP_PREFIX_ADDRESS, frame->data, frame->len);
|
|
*
|
|
* Example output using %DUMP_PREFIX_OFFSET:
|
|
* 0009ab42: 40414243 44454647 48494a4b 4c4d4e4f @ABCDEFGHIJKLMNO
|
|
* Example output using %DUMP_PREFIX_ADDRESS:
|
|
* ffffffff88089af0: 70717273 74757677 78797a7b 7c7d7e7f pqrstuvwxyz{|}~.
|
|
*/
|
|
void print_hex_dump(const char *level, int prefix_type, void *buf, size_t len)
|
|
{
|
|
u8 *ptr = buf;
|
|
int i, linelen, remaining = len;
|
|
unsigned char linebuf[100];
|
|
|
|
for (i = 0; i < len; i += 16) {
|
|
linelen = min(remaining, 16);
|
|
remaining -= 16;
|
|
hex_dump_to_buffer(ptr + i, linelen, linebuf, sizeof(linebuf));
|
|
|
|
switch (prefix_type) {
|
|
case DUMP_PREFIX_ADDRESS:
|
|
printk("%s%*p: %s\n", level,
|
|
(int)(2 * sizeof(void *)), ptr + i, linebuf);
|
|
break;
|
|
case DUMP_PREFIX_OFFSET:
|
|
printk("%s%.8x: %s\n", level, i, linebuf);
|
|
break;
|
|
default:
|
|
printk("%s%s\n", level, linebuf);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(print_hex_dump);
|