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![Li Zefan](/assets/img/avatar_default.png)
For example: hex_dump_to_buffer("AB", 2, 16, 1, buf, 100, 0); pr_info("[%s]\n", buf); I'd expect the output to be "[41 42]", but actually it's "[41 42 ]" This patch also makes the required buf to be minimum. To print the hex format of "AB", a buf with size 6 should be sufficient, but hex_dump_to_buffer() required at least 8. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
204 lines
6.1 KiB
C
204 lines
6.1 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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const char hex_asc[] = "0123456789abcdef";
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EXPORT_SYMBOL(hex_asc);
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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), 1);
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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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void hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
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int groupsize, char *linebuf, size_t linebuflen,
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bool ascii)
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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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int ascii_column;
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if (rowsize != 16 && rowsize != 32)
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rowsize = 16;
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if (!len)
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goto nil;
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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 ((len % groupsize) != 0) /* no mixed size output */
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groupsize = 1;
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switch (groupsize) {
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case 8: {
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const u64 *ptr8 = buf;
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int ngroups = len / groupsize;
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for (j = 0; j < ngroups; j++)
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lx += scnprintf(linebuf + lx, linebuflen - lx,
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"%s%16.16llx", j ? " " : "",
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(unsigned long long)*(ptr8 + j));
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ascii_column = 17 * ngroups + 2;
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break;
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}
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case 4: {
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const u32 *ptr4 = buf;
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int ngroups = len / groupsize;
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for (j = 0; j < ngroups; j++)
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lx += scnprintf(linebuf + lx, linebuflen - lx,
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"%s%8.8x", j ? " " : "", *(ptr4 + j));
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ascii_column = 9 * ngroups + 2;
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break;
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}
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case 2: {
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const u16 *ptr2 = buf;
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int ngroups = len / groupsize;
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for (j = 0; j < ngroups; j++)
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lx += scnprintf(linebuf + lx, linebuflen - lx,
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"%s%4.4x", j ? " " : "", *(ptr2 + j));
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ascii_column = 5 * ngroups + 2;
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break;
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}
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default:
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for (j = 0; (j < len) && (lx + 3) <= linebuflen; j++) {
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ch = ptr[j];
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linebuf[lx++] = hex_asc_hi(ch);
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linebuf[lx++] = hex_asc_lo(ch);
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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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ascii_column = 3 * rowsize + 2;
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break;
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}
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if (!ascii)
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goto nil;
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while (lx < (linebuflen - 1) && lx < (ascii_column - 1))
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linebuf[lx++] = ' ';
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for (j = 0; (j < len) && (lx + 2) < linebuflen; j++)
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linebuf[lx++] = (isascii(ptr[j]) && isprint(ptr[j])) ? ptr[j]
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: '.';
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nil:
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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_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 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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* 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(KERN_DEBUG, "raw data: ", DUMP_PREFIX_ADDRESS,
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* 16, 1, frame->data, frame->len, 1);
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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 *level, const char *prefix_str, int prefix_type,
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int rowsize, int groupsize,
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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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unsigned char linebuf[200];
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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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printk("%s%s%*p: %s\n", level, prefix_str,
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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%s%.8x: %s\n", level, prefix_str, i, linebuf);
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break;
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default:
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printk("%s%s%s\n", level, prefix_str, 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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/**
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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(), with log level of KERN_DEBUG,
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* rowsize of 16, groupsize of 1, 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(KERN_DEBUG, prefix_str, prefix_type, 16, 1,
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buf, len, 1);
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}
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EXPORT_SYMBOL(print_hex_dump_bytes);
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