Function textdump_dump_msgbuf

freebsd/ddb/db_textdump.c:332–385

* Dump kernel message buffer. */

 * Dump kernel message buffer.
 */
static void
textdump_dump_msgbuf(struct dumperinfo *di)
{
	off_t end_offset, tarhdr_offset;
	u_int i, len, offset, seq, total_len;
	char buf[16];

	/*
	 * Write out a dummy tar header to advance the offset; we'll rewrite
	 * it later once we know the true size.
	 */
	textdump_saveoff(&tarhdr_offset);
	textdump_mkustar(textdump_block_buffer, TAR_MSGBUF_FILENAME, 0);
	(void)textdump_writenextblock(di, textdump_block_buffer);

	/*
	 * Copy out the data in small chunks, but don't copy nuls that may be
	 * present if the message buffer has not yet completely filled at
	 * least once.
	 */
	total_len = 0;
	offset = 0;
	msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
	while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) {
		for (i = 0; i < len; i++) {
			if (buf[i] == '\0')
				continue;
			textdump_block_buffer[offset] = buf[i];
			offset++;
			if (offset != sizeof(textdump_block_buffer))
				continue;
			(void)textdump_writenextblock(di,
			    textdump_block_buffer);
			total_len += offset;
			offset = 0;
		}
	}
	total_len += offset;	/* Without the zero-padding. */
	if (offset != 0) {
		bzero(textdump_block_buffer + offset,
		    sizeof(textdump_block_buffer) - offset);
		(void)textdump_writenextblock(di, textdump_block_buffer);
	}

	/*
	 * Rewrite tar header to reflect how much was actually written.
	 */
	textdump_saveoff(&end_offset);
	textdump_restoreoff(tarhdr_offset);
	textdump_mkustar(textdump_block_buffer, TAR_MSGBUF_FILENAME,
	    total_len);
	(void)textdump_writenextblock(di, textdump_block_buffer);
	textdump_restoreoff(end_offset);
}

static void
textdump_dump_panic(struct dumperinfo *di)