diff options
Diffstat (limited to 'include/hexdump.h')
| -rw-r--r-- | include/hexdump.h | 81 |
1 files changed, 78 insertions, 3 deletions
diff --git a/include/hexdump.h b/include/hexdump.h index f7b76ff712..f2ca4793d6 100644 --- a/include/hexdump.h +++ b/include/hexdump.h @@ -10,7 +10,7 @@ #include <linux/ctype.h> #include <linux/types.h> -enum { +enum dump_prefix_t { DUMP_PREFIX_NONE, DUMP_PREFIX_ADDRESS, DUMP_PREFIX_OFFSET @@ -81,10 +81,85 @@ static inline char *bin2hex(char *dst, const void *src, size_t count) return dst; } +/** + * 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 + * @rowsize: number of bytes to print per line; max 64 + * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1) + * @linebuf: where to put the converted data + * @linebuflen: total size of @linebuf, including space for terminating NUL + * @ascii: include ASCII after the hex output + * + * hex_dump_to_buffer() works on one "line" of output at a time, i.e., + * 16 or 32 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, 16, 1, + * linebuf, sizeof(linebuf), true); + * + * example output buffer: + * 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO + * + * Return: + * The amount of bytes placed in the buffer without terminating NUL. If the + * output was truncated, then the return value is the number of bytes + * (excluding the terminating NUL) which would have been written to the final + * string if enough space had been available. + */ int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize, char *linebuf, size_t linebuflen, bool ascii); -void print_hex_dump(const char *prefix_str, int prefix_type, int rowsize, - int groupsize, const void *buf, size_t len, bool ascii); + +/** + * print_hex_dump - print a text hex dump to syslog for a binary blob of data + * @prefix_str: string to prefix each line with; + * caller supplies trailing spaces for alignment if desired + * @prefix_type: controls whether prefix of an offset, address, or none + * is printed (see enum dump_prefix_t) + * @rowsize: number of bytes to print per line; max 64 + * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1) + * @buf: data blob to dump + * @len: number of bytes in the @buf + * @ascii: include ASCII after the hex output + * Returns: 0 if finished normally, -EINTR if Ctrl-C was pressed, -ENOSYS if not + * supported + * + * Given a buffer of u8 data, print_hex_dump() prints a hex + ASCII dump + * to the stdio, with an optional leading prefix. + * + * print_hex_dump() works on one "line" of output at a time, i.e., + * 16 or 32 bytes of input data converted to hex + ASCII output. + * print_hex_dump() iterates over the entire input @buf, breaking it into + * "line size" chunks to format and print. + * + * E.g.: + * print_hex_dump("raw data: ", DUMP_PREFIX_ADDRESS, 16, 1, frame->data, + * frame->len, true); + * + * Example output using %DUMP_PREFIX_OFFSET and 1-byte mode: + * 0009ab42: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO + * Example output using %DUMP_PREFIX_ADDRESS and 4-byte mode: + * ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c pqrstuvwxyz{|}~. + */ +int print_hex_dump(const char *prefix_str, int prefix_type, int rowsize, + int groupsize, const void *buf, size_t len, bool ascii); + +/** + * print_hex_dump_bytes - shorthand form of print_hex_dump() with default params + * @prefix_str: string to prefix each line with; + * caller supplies trailing spaces for alignment if desired + * @prefix_type: controls whether prefix of an offset, address, or none + * is printed (see enum dump_prefix_t) + * @buf: data blob to dump + * @len: number of bytes in the @buf + * + * Calls print_hex_dump(), rowsize of 16, groupsize of 1, + * and ASCII output included. + */ void print_hex_dump_bytes(const char *prefix_str, int prefix_type, const void *buf, size_t len); |