[PATCH net-next v3 1/3] hexdump: Implement macro for converting large buffers
From: Nick Child <nnac123@linux.ibm.com>
Date: 2025-02-19 21:11:42
Also in:
lkml
Subsystem:
printk, the rest · Maintainers:
Petr Mladek, Linus Torvalds
Define for_each_line_in_hex_dump which loops over a buffer and calls hex_dump_to_buffer for each segment in the buffer. This allows the caller to decide what to do with the resulting string and is not limited by a specific printing format like print_hex_dump. Signed-off-by: Nick Child <nnac123@linux.ibm.com> --- include/linux/printk.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/include/linux/printk.h b/include/linux/printk.h
index 4217a9f412b2..12e51b1cdca5 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h@@ -755,6 +755,26 @@ enum { extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize, char *linebuf, size_t linebuflen, bool ascii); +/** + * for_each_line_in_hex_dump - iterate over buffer, converting into hex ASCII + * @i: offset in @buff + * @rowsize: number of bytes to print per line; must be 16 or 32 + * @linebuf: where to put the converted data + * @linebuflen: total size of @linebuf, including space for terminating NUL + * IOW >= (@rowsize * 2) + ((@rowsize - 1 / @groupsize)) + 1 + * @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 + */ + #define for_each_line_in_hex_dump(i, rowsize, linebuf, linebuflen, groupsize, \ + buf, len) \ + for ((i) = 0; \ + (i) < (len) && \ + hex_dump_to_buffer((unsigned char *)(buf) + (i), \ + (len) - (i), (rowsize), (groupsize), \ + (linebuf), (linebuflen), false); \ + (i) += (rowsize) == 32 ? 32 : 16 \ + ) #ifdef CONFIG_PRINTK extern void print_hex_dump(const char *level, const char *prefix_str, int prefix_type, int rowsize, int groupsize,
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2.48.1