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seq_file: provide an analogue of print_hex_dump()

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This introduces a new helper and switches current users to use it.  All
patches are compiled tested. kmemleak is tested via its own test suite.

This patch (of 6):

The new seq_hex_dump() is a complete analogue of print_hex_dump().

We have few users of this functionality already. It allows to reduce their
codebase.

Signed-off-by: Andy Shevchenko <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Tadeusz Struk <[email protected]>
Cc: Helge Deller <[email protected]>
Cc: Ingo Tuchscherer <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Vladimir Kondratiev <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andy Shevchenko 2015-09-09 15:38:33 -07:00 • committed by Linus Torvalds
commit 37607102c4
2 changed files with 46 additions and 0 deletions
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42
fs/seq_file.c
View file

@ -12,6 +12,7 @@
#include <linux/slab.h>
#include <linux/cred.h>
#include <linux/mm.h>
#include <linux/printk.h>
#include <asm/uaccess.h>
#include <asm/page.h>
@ -773,6 +774,47 @@ void seq_pad(struct seq_file *m, char c)
}
EXPORT_SYMBOL(seq_pad);
/* A complete analogue of print_hex_dump() */
void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
int rowsize, int groupsize, const void *buf, size_t len,
bool ascii)
{
const u8 *ptr = buf;
int i, linelen, remaining = len;
int ret;
if (rowsize != 16 && rowsize != 32)
rowsize = 16;
for (i = 0; i < len && !seq_has_overflowed(m); i += rowsize) {
linelen = min(remaining, rowsize);
remaining -= rowsize;
switch (prefix_type) {
case DUMP_PREFIX_ADDRESS:
seq_printf(m, "%s%p: ", prefix_str, ptr + i);
break;
case DUMP_PREFIX_OFFSET:
seq_printf(m, "%s%.8x: ", prefix_str, i);
break;
default:
seq_printf(m, "%s", prefix_str);
break;
}
ret = hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
m->buf + m->count, m->size - m->count,
ascii);
if (ret >= m->size - m->count) {
seq_set_overflow(m);
} else {
m->count += ret;
seq_putc(m, '\n');
}
}
}
EXPORT_SYMBOL(seq_hex_dump);
struct list_head *seq_list_start(struct list_head *head, loff_t pos)
{
struct list_head *lh;