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