lib/hexdump.c: reduce stack variable size and cleanups
Reduce char linebuf[200] to the actual size required., which is 32 * 3 + 2
+ 32 + 1, ie: linebuf[131].
Change examples to use bool true not int 1.
Align multiline argument indentation to open parenthesis.
Use temporary for ptr[j] so trigraph fits on single line.
Convert printk ptr from %*p, (int)(2 * sizeof(void *)) to %p as %p uses
the same calculation for size.
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/lib/hexdump.c b/lib/hexdump.c
index 39af256..1bd6a97 100644
--- a/lib/hexdump.c
+++ b/lib/hexdump.c
@@ -34,7 +34,7 @@
*
* E.g.:
* hex_dump_to_buffer(frame->data, frame->len, 16, 1,
- * linebuf, sizeof(linebuf), 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
@@ -65,8 +65,8 @@
for (j = 0; j < ngroups; j++)
lx += scnprintf(linebuf + lx, linebuflen - lx,
- "%s%16.16llx", j ? " " : "",
- (unsigned long long)*(ptr8 + j));
+ "%s%16.16llx", j ? " " : "",
+ (unsigned long long)*(ptr8 + j));
ascii_column = 17 * ngroups + 2;
break;
}
@@ -77,7 +77,7 @@
for (j = 0; j < ngroups; j++)
lx += scnprintf(linebuf + lx, linebuflen - lx,
- "%s%8.8x", j ? " " : "", *(ptr4 + j));
+ "%s%8.8x", j ? " " : "", *(ptr4 + j));
ascii_column = 9 * ngroups + 2;
break;
}
@@ -88,7 +88,7 @@
for (j = 0; j < ngroups; j++)
lx += scnprintf(linebuf + lx, linebuflen - lx,
- "%s%4.4x", j ? " " : "", *(ptr2 + j));
+ "%s%4.4x", j ? " " : "", *(ptr2 + j));
ascii_column = 5 * ngroups + 2;
break;
}
@@ -111,9 +111,10 @@
while (lx < (linebuflen - 1) && lx < (ascii_column - 1))
linebuf[lx++] = ' ';
- for (j = 0; (j < len) && (lx + 2) < linebuflen; j++)
- linebuf[lx++] = (isascii(ptr[j]) && isprint(ptr[j])) ? ptr[j]
- : '.';
+ for (j = 0; (j < len) && (lx + 2) < linebuflen; j++) {
+ ch = ptr[j];
+ linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.';
+ }
nil:
linebuf[lx++] = '\0';
}
@@ -143,7 +144,7 @@
*
* E.g.:
* print_hex_dump(KERN_DEBUG, "raw data: ", DUMP_PREFIX_ADDRESS,
- * 16, 1, frame->data, frame->len, 1);
+ * 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
@@ -151,12 +152,12 @@
* ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c pqrstuvwxyz{|}~.
*/
void print_hex_dump(const char *level, const char *prefix_str, int prefix_type,
- int rowsize, int groupsize,
- const void *buf, size_t len, bool ascii)
+ int rowsize, int groupsize,
+ const void *buf, size_t len, bool ascii)
{
const u8 *ptr = buf;
int i, linelen, remaining = len;
- unsigned char linebuf[200];
+ unsigned char linebuf[32 * 3 + 2 + 32 + 1];
if (rowsize != 16 && rowsize != 32)
rowsize = 16;
@@ -164,13 +165,14 @@
for (i = 0; i < len; i += rowsize) {
linelen = min(remaining, rowsize);
remaining -= rowsize;
+
hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
- linebuf, sizeof(linebuf), ascii);
+ linebuf, sizeof(linebuf), ascii);
switch (prefix_type) {
case DUMP_PREFIX_ADDRESS:
- printk("%s%s%*p: %s\n", level, prefix_str,
- (int)(2 * sizeof(void *)), ptr + i, linebuf);
+ printk("%s%s%p: %s\n",
+ level, prefix_str, ptr + i, linebuf);
break;
case DUMP_PREFIX_OFFSET:
printk("%s%s%.8x: %s\n", level, prefix_str, i, linebuf);
@@ -196,9 +198,9 @@
* 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)
+ const void *buf, size_t len)
{
print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, 16, 1,
- buf, len, 1);
+ buf, len, true);
}
EXPORT_SYMBOL(print_hex_dump_bytes);