aboutsummaryrefslogtreecommitdiffstats
path: root/lib/test-hexdump.c
diff options
context:
space:
mode:
authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2015-02-12 23:02:29 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-13 02:54:15 (GMT)
commit114fc1afb2de7dec40da137dc2a55cd38fc220f2 (patch)
tree414c7731a5a4743cbdba6583a1b79f3723ec190d /lib/test-hexdump.c
parent5d909c8d54b114eddb7c50506f03bf7309a9192e (diff)
hexdump: make it return number of bytes placed in buffer
This patch makes hexdump return the number of bytes placed in the buffer excluding trailing NUL. In the case of overflow it returns the desired amount of bytes to produce the entire dump. Thus, it mimics snprintf(). This will be useful for users that would like to repeat with a bigger buffer. [akpm@linux-foundation.org: fix printk warning] 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>
Diffstat (limited to 'lib/test-hexdump.c')
-rw-r--r--lib/test-hexdump.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/lib/test-hexdump.c b/lib/test-hexdump.c
index 9d3bd1e..daf29a39 100644
--- a/lib/test-hexdump.c
+++ b/lib/test-hexdump.c
@@ -114,6 +114,45 @@ static void __init test_hexdump_set(int rowsize, bool ascii)
test_hexdump(len, rowsize, 1, ascii);
}
+static void __init test_hexdump_overflow(bool ascii)
+{
+ char buf[56];
+ const char *t = test_data_1_le[0];
+ size_t l = get_random_int() % sizeof(buf);
+ bool a;
+ int e, r;
+
+ memset(buf, ' ', sizeof(buf));
+
+ r = hex_dump_to_buffer(data_b, 1, 16, 1, buf, l, ascii);
+
+ if (ascii)
+ e = 50;
+ else
+ e = 2;
+ buf[e + 2] = '\0';
+
+ if (!l) {
+ a = r == e && buf[0] == ' ';
+ } else if (l < 3) {
+ a = r == e && buf[0] == '\0';
+ } else if (l < 4) {
+ a = r == e && !strcmp(buf, t);
+ } else if (ascii) {
+ if (l < 51)
+ a = r == e && buf[l - 1] == '\0' && buf[l - 2] == ' ';
+ else
+ a = r == e && buf[50] == '\0' && buf[49] == '.';
+ } else {
+ a = r == e && buf[e] == '\0';
+ }
+
+ if (!a) {
+ pr_err("Len: %zu rc: %u strlen: %zu\n", l, r, strlen(buf));
+ pr_err("Result: '%s'\n", buf);
+ }
+}
+
static int __init test_hexdump_init(void)
{
unsigned int i;
@@ -129,6 +168,12 @@ static int __init test_hexdump_init(void)
for (i = 0; i < 16; i++)
test_hexdump_set(rowsize, true);
+ for (i = 0; i < 16; i++)
+ test_hexdump_overflow(false);
+
+ for (i = 0; i < 16; i++)
+ test_hexdump_overflow(true);
+
return -EINVAL;
}
module_init(test_hexdump_init);

Privacy Policy