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msgb: Add msgb_hexdump() function 

This function works like osmo_hexdump() and returns a static buffer
containing hex bytes along with markers for the layers.

Note that it uses osmo_hexdump() internally, thus a call to
msgb_hexdump() invalidates the buffer that has been returned by an
earlier call to osmo_hexdump(). In short: don't mix them in a single
call printf().

Sponsored-by: On-Waves ehf
This commit is contained in:
Jacob Erlbeck 2014-02-28 15:14:40 +01:00
parent 10f0bdecad
commit baa225ed86
2 changed files with 50 additions and 0 deletions
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1
include/osmocom/core/msgb.h
View File

@ -73,6 +73,7 @@ extern void msgb_enqueue(struct llist_head *queue, struct msgb *msg);
extern struct msgb *msgb_dequeue(struct llist_head *queue);
extern void msgb_reset(struct msgb *m);
uint16_t msgb_length(const struct msgb *msg);
extern const char *msgb_hexdump(const struct msgb *msg);
#ifdef MSGB_DEBUG
#include <osmocom/core/panic.h>

49
src/msgb.c
View File

@ -153,4 +153,53 @@ void msgb_set_talloc_ctx(void *ctx)
tall_msgb_ctx = ctx;
}
/*! \brief Return a (static) buffer containing a hexdump of the msg
* \param[in] msg message buffer
* \returns a pointer to a static char array
*/
const char *msgb_hexdump(const struct msgb *msg)
{
static char buf[4100];
int buf_offs = 0;
int nchars;
const unsigned char *start = msg->data;
const unsigned char *lxhs[4];
int i;
lxhs[0] = msg->l1h;
lxhs[1] = msg->l2h;
lxhs[2] = msg->l3h;
lxhs[3] = msg->l4h;
for (i = 0; i < ARRAY_SIZE(lxhs); i++) {
if (!lxhs[i])
continue;
if (lxhs[i] < msg->data)
goto out_of_range;
if (lxhs[i] > msg->tail)
goto out_of_range;
nchars = snprintf(buf + buf_offs, sizeof(buf) - buf_offs,
"%s[L%d]> ",
osmo_hexdump(start, lxhs[i] - start),
i+1);
if (nchars < 0 || nchars + buf_offs >= sizeof(buf))
return "ERROR";
buf_offs += nchars;
start = lxhs[i];
}
nchars = snprintf(buf + buf_offs, sizeof(buf) - buf_offs,
"%s", osmo_hexdump(start, msg->tail - start));
if (nchars < 0 || nchars + buf_offs >= sizeof(buf))
return "ERROR";
return buf;
out_of_range:
nchars = snprintf(buf, sizeof(buf) - buf_offs,
"!!! L%d out of range", i+1);
return buf;
}
/*! @} */