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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2015-02-12 15:02:26 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-12 18:54:15 -0800
commit5d909c8d54b114eddb7c50506f03bf7309a9192e (patch)
tree276ad2aa80b54b674b67e74552fbab443a235b8b
parent6f6f3fcb87a53c720941f4bd039ec2c0bce66625 (diff)
hexdump: do a few calculations ahead
Instead of doing calculations in each case of different groupsize let's do them beforehand. While there, change the switch to an if-else-if construction. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--lib/hexdump.c34
1 files changed, 10 insertions, 24 deletions
diff --git a/lib/hexdump.c b/lib/hexdump.c
index a61cb6b1f011..4af53f73c7cc 100644
--- a/lib/hexdump.c
+++ b/lib/hexdump.c
@@ -103,6 +103,7 @@ void hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
bool ascii)
{
const u8 *ptr = buf;
+ int ngroups;
u8 ch;
int j, lx = 0;
int ascii_column;
@@ -114,45 +115,33 @@ void hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
goto nil;
if (len > rowsize) /* limit to one line at a time */
len = rowsize;
+ if (!is_power_of_2(groupsize) || groupsize > 8)
+ groupsize = 1;
if ((len % groupsize) != 0) /* no mixed size output */
groupsize = 1;
- switch (groupsize) {
- case 8: {
+ ngroups = len / groupsize;
+ ascii_column = rowsize * 2 + rowsize / groupsize + 1;
+ if (groupsize == 8) {
const u64 *ptr8 = buf;
- int ngroups = len / groupsize;
for (j = 0; j < ngroups; j++)
lx += scnprintf(linebuf + lx, linebuflen - lx,
"%s%16.16llx", j ? " " : "",
(unsigned long long)*(ptr8 + j));
- ascii_column = rowsize * 2 + rowsize / 8 + 2;
- break;
- }
-
- case 4: {
+ } else if (groupsize == 4) {
const u32 *ptr4 = buf;
- int ngroups = len / groupsize;
for (j = 0; j < ngroups; j++)
lx += scnprintf(linebuf + lx, linebuflen - lx,
"%s%8.8x", j ? " " : "", *(ptr4 + j));
- ascii_column = rowsize * 2 + rowsize / 4 + 2;
- break;
- }
-
- case 2: {
+ } else if (groupsize == 2) {
const u16 *ptr2 = buf;
- int ngroups = len / groupsize;
for (j = 0; j < ngroups; j++)
lx += scnprintf(linebuf + lx, linebuflen - lx,
"%s%4.4x", j ? " " : "", *(ptr2 + j));
- ascii_column = rowsize * 2 + rowsize / 2 + 2;
- break;
- }
-
- default:
+ } else {
for (j = 0; (j < len) && (lx + 3) <= linebuflen; j++) {
ch = ptr[j];
linebuf[lx++] = hex_asc_hi(ch);
@@ -161,14 +150,11 @@ void hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
}
if (j)
lx--;
-
- ascii_column = 3 * rowsize + 2;
- break;
}
if (!ascii)
goto nil;
- while (lx < (linebuflen - 1) && lx < (ascii_column - 1))
+ while (lx < (linebuflen - 1) && lx < ascii_column)
linebuf[lx++] = ' ';
for (j = 0; (j < len) && (lx + 2) < linebuflen; j++) {
ch = ptr[j];