246 lines
7.1 KiB
C
246 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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 <common.h>
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#include <hexdump.h>
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#include <linux/ctype.h>
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#include <linux/compat.h>
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#include <linux/log2.h>
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#include <asm/unaligned.h>
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const char hex_asc[] = "0123456789abcdef";
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const char hex_asc_upper[] = "0123456789ABCDEF";
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#ifdef CONFIG_HEXDUMP
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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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* @rowsize: number of bytes to print per line; must be 16 or 32
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* @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
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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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* @ascii: include ASCII after the hex output
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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 or 32 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, 16, 1,
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* linebuf, sizeof(linebuf), true);
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*
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* example output buffer:
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* 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO
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*
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* Return:
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* The amount of bytes placed in the buffer without terminating NUL. If the
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* output was truncated, then the return value is the number of bytes
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* (excluding the terminating NUL) which would have been written to the final
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* string if enough space had been available.
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*/
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int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
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char *linebuf, size_t linebuflen, bool ascii)
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{
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const u8 *ptr = buf;
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int ngroups;
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u8 ch;
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int j, lx = 0;
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int ascii_column;
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int ret;
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if (rowsize != 16 && rowsize != 32)
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rowsize = 16;
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if (len > rowsize) /* limit to one line at a time */
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len = rowsize;
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if (!is_power_of_2(groupsize) || groupsize > 8)
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groupsize = 1;
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if ((len % groupsize) != 0) /* no mixed size output */
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groupsize = 1;
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ngroups = len / groupsize;
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ascii_column = rowsize * 2 + rowsize / groupsize + 1;
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if (!linebuflen)
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goto overflow1;
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if (!len)
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goto nil;
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if (groupsize == 8) {
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const u64 *ptr8 = buf;
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for (j = 0; j < ngroups; j++) {
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ret = snprintf(linebuf + lx, linebuflen - lx,
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"%s%16.16llx", j ? " " : "",
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get_unaligned(ptr8 + j));
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if (ret >= linebuflen - lx)
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goto overflow1;
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lx += ret;
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}
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} else if (groupsize == 4) {
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const u32 *ptr4 = buf;
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for (j = 0; j < ngroups; j++) {
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ret = snprintf(linebuf + lx, linebuflen - lx,
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"%s%8.8x", j ? " " : "",
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get_unaligned(ptr4 + j));
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if (ret >= linebuflen - lx)
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goto overflow1;
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lx += ret;
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}
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} else if (groupsize == 2) {
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const u16 *ptr2 = buf;
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for (j = 0; j < ngroups; j++) {
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ret = snprintf(linebuf + lx, linebuflen - lx,
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"%s%4.4x", j ? " " : "",
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get_unaligned(ptr2 + j));
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if (ret >= linebuflen - lx)
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goto overflow1;
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lx += ret;
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}
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} else {
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for (j = 0; j < len; j++) {
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if (linebuflen < lx + 2)
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goto overflow2;
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ch = ptr[j];
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linebuf[lx++] = hex_asc_hi(ch);
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if (linebuflen < lx + 2)
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goto overflow2;
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linebuf[lx++] = hex_asc_lo(ch);
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if (linebuflen < lx + 2)
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goto overflow2;
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linebuf[lx++] = ' ';
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}
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if (j)
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lx--;
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}
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if (!ascii)
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goto nil;
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while (lx < ascii_column) {
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if (linebuflen < lx + 2)
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goto overflow2;
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linebuf[lx++] = ' ';
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}
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for (j = 0; j < len; j++) {
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if (linebuflen < lx + 2)
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goto overflow2;
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ch = ptr[j];
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linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.';
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}
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nil:
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linebuf[lx] = '\0';
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return lx;
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overflow2:
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linebuf[lx++] = '\0';
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overflow1:
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return ascii ? ascii_column + len : (groupsize * 2 + 1) * ngroups - 1;
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}
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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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* @prefix_str: string to prefix each line with;
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* caller supplies trailing spaces for alignment if desired
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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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* @rowsize: number of bytes to print per line; must be 16 or 32
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* @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
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* @buf: data blob to dump
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* @len: number of bytes in the @buf
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* @ascii: include ASCII after the hex output
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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 stdio, with an optional leading prefix.
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*
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* print_hex_dump() works on one "line" of output at a time, i.e.,
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* 16 or 32 bytes of input data converted to hex + ASCII output.
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* print_hex_dump() iterates over the entire input @buf, breaking it into
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* "line size" chunks to format and print.
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*
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* E.g.:
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* print_hex_dump("raw data: ", DUMP_PREFIX_ADDRESS, 16, 1, frame->data,
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* frame->len, true);
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*
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* Example output using %DUMP_PREFIX_OFFSET and 1-byte mode:
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* 0009ab42: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO
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* Example output using %DUMP_PREFIX_ADDRESS and 4-byte mode:
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* ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c pqrstuvwxyz{|}~.
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*/
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void print_hex_dump(const char *prefix_str, int prefix_type, int rowsize,
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int groupsize, const void *buf, size_t len, bool ascii)
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{
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const u8 *ptr = buf;
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int i, linelen, remaining = len;
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char linebuf[32 * 3 + 2 + 32 + 1];
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if (rowsize != 16 && rowsize != 32)
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rowsize = 16;
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for (i = 0; i < len; i += rowsize) {
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linelen = min(remaining, rowsize);
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remaining -= rowsize;
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hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
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linebuf, sizeof(linebuf), ascii);
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switch (prefix_type) {
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case DUMP_PREFIX_ADDRESS:
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printf("%s%p: %s\n", prefix_str, ptr + i, linebuf);
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break;
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case DUMP_PREFIX_OFFSET:
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printf("%s%.8x: %s\n", prefix_str, i, linebuf);
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break;
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default:
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printf("%s%s\n", prefix_str, linebuf);
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break;
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}
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}
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}
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/**
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* print_hex_dump_bytes - shorthand form of print_hex_dump() with default params
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* @prefix_str: string to prefix each line with;
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* caller supplies trailing spaces for alignment if desired
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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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* Calls print_hex_dump(), rowsize of 16, groupsize of 1,
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* and ASCII output included.
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*/
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void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
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const void *buf, size_t len)
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{
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print_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true);
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}
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#else
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/*
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* Some code in U-Boot copy-pasted from Linux kernel uses both
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* functions below so to keep stuff compilable we keep these stubs here.
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*/
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void print_hex_dump(const char *prefix_str, int prefix_type,
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int rowsize, int groupsize, const void *buf,
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size_t len, bool ascii)
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{
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}
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void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
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const void *buf, size_t len)
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{
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}
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#endif /* CONFIG_HEXDUMP */
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