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99eaf3c4 RD |
1 | /* |
2 | * lib/hexdump.c | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. See README and COPYING for | |
7 | * more details. | |
8 | */ | |
9 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/ctype.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | ||
15 | /** | |
16 | * hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory | |
17 | * @buf: data blob to dump | |
18 | * @len: number of bytes in the @buf | |
c7909234 RD |
19 | * @rowsize: number of bytes to print per line; must be 16 or 32 |
20 | * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1) | |
99eaf3c4 RD |
21 | * @linebuf: where to put the converted data |
22 | * @linebuflen: total size of @linebuf, including space for terminating NUL | |
c7909234 | 23 | * @ascii: include ASCII after the hex output |
99eaf3c4 RD |
24 | * |
25 | * hex_dump_to_buffer() works on one "line" of output at a time, i.e., | |
c7909234 | 26 | * 16 or 32 bytes of input data converted to hex + ASCII output. |
99eaf3c4 RD |
27 | * |
28 | * Given a buffer of u8 data, hex_dump_to_buffer() converts the input data | |
29 | * to a hex + ASCII dump at the supplied memory location. | |
30 | * The converted output is always NUL-terminated. | |
31 | * | |
32 | * E.g.: | |
c7909234 RD |
33 | * hex_dump_to_buffer(frame->data, frame->len, 16, 1, |
34 | * linebuf, sizeof(linebuf), 1); | |
99eaf3c4 RD |
35 | * |
36 | * example output buffer: | |
c7909234 | 37 | * 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO |
99eaf3c4 | 38 | */ |
c7909234 RD |
39 | void hex_dump_to_buffer(const void *buf, size_t len, int rowsize, |
40 | int groupsize, char *linebuf, size_t linebuflen, | |
41 | bool ascii) | |
99eaf3c4 RD |
42 | { |
43 | const u8 *ptr = buf; | |
44 | u8 ch; | |
45 | int j, lx = 0; | |
c7909234 | 46 | int ascii_column; |
99eaf3c4 | 47 | |
c7909234 RD |
48 | if (rowsize != 16 && rowsize != 32) |
49 | rowsize = 16; | |
50 | ||
51 | if (!len) | |
52 | goto nil; | |
53 | if (len > rowsize) /* limit to one line at a time */ | |
54 | len = rowsize; | |
55 | if ((len % groupsize) != 0) /* no mixed size output */ | |
56 | groupsize = 1; | |
57 | ||
58 | switch (groupsize) { | |
59 | case 8: { | |
60 | const u64 *ptr8 = buf; | |
61 | int ngroups = len / groupsize; | |
62 | ||
63 | for (j = 0; j < ngroups; j++) | |
64 | lx += scnprintf(linebuf + lx, linebuflen - lx, | |
65 | "%16.16llx ", (unsigned long long)*(ptr8 + j)); | |
66 | ascii_column = 17 * ngroups + 2; | |
67 | break; | |
68 | } | |
69 | ||
70 | case 4: { | |
71 | const u32 *ptr4 = buf; | |
72 | int ngroups = len / groupsize; | |
73 | ||
74 | for (j = 0; j < ngroups; j++) | |
75 | lx += scnprintf(linebuf + lx, linebuflen - lx, | |
76 | "%8.8x ", *(ptr4 + j)); | |
77 | ascii_column = 9 * ngroups + 2; | |
78 | break; | |
79 | } | |
80 | ||
81 | case 2: { | |
82 | const u16 *ptr2 = buf; | |
83 | int ngroups = len / groupsize; | |
84 | ||
85 | for (j = 0; j < ngroups; j++) | |
86 | lx += scnprintf(linebuf + lx, linebuflen - lx, | |
87 | "%4.4x ", *(ptr2 + j)); | |
88 | ascii_column = 5 * ngroups + 2; | |
89 | break; | |
90 | } | |
91 | ||
92 | default: | |
93 | for (j = 0; (j < rowsize) && (j < len) && (lx + 4) < linebuflen; | |
94 | j++) { | |
95 | ch = ptr[j]; | |
96 | linebuf[lx++] = hex_asc(ch >> 4); | |
97 | linebuf[lx++] = hex_asc(ch & 0x0f); | |
99eaf3c4 | 98 | linebuf[lx++] = ' '; |
c7909234 RD |
99 | } |
100 | ascii_column = 3 * rowsize + 2; | |
101 | break; | |
99eaf3c4 | 102 | } |
c7909234 RD |
103 | if (!ascii) |
104 | goto nil; | |
105 | ||
106 | while (lx < (linebuflen - 1) && lx < (ascii_column - 1)) | |
99eaf3c4 | 107 | linebuf[lx++] = ' '; |
c7909234 | 108 | for (j = 0; (j < rowsize) && (j < len) && (lx + 2) < linebuflen; j++) |
99eaf3c4 | 109 | linebuf[lx++] = isprint(ptr[j]) ? ptr[j] : '.'; |
c7909234 | 110 | nil: |
99eaf3c4 RD |
111 | linebuf[lx++] = '\0'; |
112 | } | |
113 | EXPORT_SYMBOL(hex_dump_to_buffer); | |
114 | ||
115 | /** | |
116 | * print_hex_dump - print a text hex dump to syslog for a binary blob of data | |
117 | * @level: kernel log level (e.g. KERN_DEBUG) | |
c7909234 RD |
118 | * @prefix_str: string to prefix each line with; |
119 | * caller supplies trailing spaces for alignment if desired | |
99eaf3c4 RD |
120 | * @prefix_type: controls whether prefix of an offset, address, or none |
121 | * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE) | |
c7909234 RD |
122 | * @rowsize: number of bytes to print per line; must be 16 or 32 |
123 | * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1) | |
99eaf3c4 RD |
124 | * @buf: data blob to dump |
125 | * @len: number of bytes in the @buf | |
c7909234 | 126 | * @ascii: include ASCII after the hex output |
99eaf3c4 RD |
127 | * |
128 | * Given a buffer of u8 data, print_hex_dump() prints a hex + ASCII dump | |
129 | * to the kernel log at the specified kernel log level, with an optional | |
130 | * leading prefix. | |
131 | * | |
c7909234 RD |
132 | * print_hex_dump() works on one "line" of output at a time, i.e., |
133 | * 16 or 32 bytes of input data converted to hex + ASCII output. | |
134 | * print_hex_dump() iterates over the entire input @buf, breaking it into | |
135 | * "line size" chunks to format and print. | |
136 | * | |
99eaf3c4 | 137 | * E.g.: |
c7909234 RD |
138 | * print_hex_dump(KERN_DEBUG, "raw data: ", DUMP_PREFIX_ADDRESS, |
139 | * 16, 1, frame->data, frame->len, 1); | |
99eaf3c4 | 140 | * |
c7909234 RD |
141 | * Example output using %DUMP_PREFIX_OFFSET and 1-byte mode: |
142 | * 0009ab42: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO | |
143 | * Example output using %DUMP_PREFIX_ADDRESS and 4-byte mode: | |
144 | * ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c pqrstuvwxyz{|}~. | |
99eaf3c4 | 145 | */ |
c7909234 RD |
146 | void print_hex_dump(const char *level, const char *prefix_str, int prefix_type, |
147 | int rowsize, int groupsize, | |
148 | void *buf, size_t len, bool ascii) | |
99eaf3c4 RD |
149 | { |
150 | u8 *ptr = buf; | |
151 | int i, linelen, remaining = len; | |
c7909234 | 152 | unsigned char linebuf[200]; |
99eaf3c4 | 153 | |
c7909234 RD |
154 | if (rowsize != 16 && rowsize != 32) |
155 | rowsize = 16; | |
156 | ||
157 | for (i = 0; i < len; i += rowsize) { | |
158 | linelen = min(remaining, rowsize); | |
159 | remaining -= rowsize; | |
160 | hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize, | |
161 | linebuf, sizeof(linebuf), ascii); | |
99eaf3c4 RD |
162 | |
163 | switch (prefix_type) { | |
164 | case DUMP_PREFIX_ADDRESS: | |
c7909234 | 165 | printk("%s%s%*p: %s\n", level, prefix_str, |
99eaf3c4 RD |
166 | (int)(2 * sizeof(void *)), ptr + i, linebuf); |
167 | break; | |
168 | case DUMP_PREFIX_OFFSET: | |
c7909234 | 169 | printk("%s%s%.8x: %s\n", level, prefix_str, i, linebuf); |
99eaf3c4 RD |
170 | break; |
171 | default: | |
c7909234 | 172 | printk("%s%s%s\n", level, prefix_str, linebuf); |
99eaf3c4 RD |
173 | break; |
174 | } | |
175 | } | |
176 | } | |
177 | EXPORT_SYMBOL(print_hex_dump); | |
c7909234 RD |
178 | |
179 | /** | |
180 | * print_hex_dump_bytes - shorthand form of print_hex_dump() with default params | |
181 | * @prefix_str: string to prefix each line with; | |
182 | * caller supplies trailing spaces for alignment if desired | |
183 | * @prefix_type: controls whether prefix of an offset, address, or none | |
184 | * is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE) | |
185 | * @buf: data blob to dump | |
186 | * @len: number of bytes in the @buf | |
187 | * | |
188 | * Calls print_hex_dump(), with log level of KERN_DEBUG, | |
189 | * rowsize of 16, groupsize of 1, and ASCII output included. | |
190 | */ | |
191 | void print_hex_dump_bytes(const char *prefix_str, int prefix_type, | |
192 | void *buf, size_t len) | |
193 | { | |
194 | print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, 16, 1, | |
195 | buf, len, 1); | |
196 | } | |
197 | EXPORT_SYMBOL(print_hex_dump_bytes); |