From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01FB7C4646C for ; Tue, 25 Jun 2019 03:19:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C8D4720665 for ; Tue, 25 Jun 2019 03:19:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729282AbfFYDTj (ORCPT ); Mon, 24 Jun 2019 23:19:39 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:18068 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729048AbfFYDTi (ORCPT ); Mon, 24 Jun 2019 23:19:38 -0400 Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x5P36hUR079258 for ; Mon, 24 Jun 2019 23:19:37 -0400 Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101]) by mx0b-001b2d01.pphosted.com with ESMTP id 2tbagt1vgw-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 24 Jun 2019 23:19:36 -0400 Received: from localhost by e06smtp05.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 25 Jun 2019 04:19:24 +0100 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x5P3JNOT56295624 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 25 Jun 2019 03:19:23 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2EBA352051; Tue, 25 Jun 2019 03:19:23 +0000 (GMT) Received: from ozlabs.au.ibm.com (unknown [9.192.253.14]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id 4091852050; Tue, 25 Jun 2019 03:19:22 +0000 (GMT) Received: from adsilva.ozlabs.ibm.com (haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 6AD0BA0306; Tue, 25 Jun 2019 13:19:19 +1000 (AEST) From: "Alastair D'Silva" To: alastair@d-silva.org Cc: Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter , Dan Carpenter , Karsten Keil , Jassi Brar , Tom Lendacky , "David S. Miller" , Jose Abreu , Kalle Valo , Stanislaw Gruszka , Benson Leung , Enric Balletbo i Serra , "James E.J. Bottomley" , "Martin K. Petersen" , Greg Kroah-Hartman , Alexander Viro , Petr Mladek , Sergey Senozhatsky , Steven Rostedt , David Laight , Andrew Morton , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, ath10k@lists.infradead.org, linux-wireless@vger.kernel.org, linux-scsi@vger.kernel.org, linux-fbdev@vger.kernel.org, devel@driverdev.osuosl.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v4 5/7] lib/hexdump.c: Allow multiple groups to be separated by lines '|' Date: Tue, 25 Jun 2019 13:17:24 +1000 X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190625031726.12173-1-alastair@au1.ibm.com> References: <20190625031726.12173-1-alastair@au1.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19062503-0020-0000-0000-0000034D1361 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19062503-0021-0000-0000-000021A08030 Message-Id: <20190625031726.12173-6-alastair@au1.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-25_02:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=988 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906250024 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Alastair D'Silva With the wider display format, it can become hard to identify how many bytes into the line you are looking at. The patch adds new flags to hex_dump_to_buffer() and print_hex_dump() to print vertical lines to separate every N groups of bytes. eg. buf:00000000: 454d414e 43415053|4e495f45 00584544 NAMESPAC|E_INDEX. buf:00000010: 00000000 00000002|00000000 00000000 ........|........ Signed-off-by: Alastair D'Silva --- include/linux/printk.h | 3 +++ lib/hexdump.c | 59 ++++++++++++++++++++++++++++++++++++------ 2 files changed, 54 insertions(+), 8 deletions(-) diff --git a/include/linux/printk.h b/include/linux/printk.h index f0761b3a2d5d..ae80d7af82ab 100644 --- a/include/linux/printk.h +++ b/include/linux/printk.h @@ -485,6 +485,9 @@ enum { #define HEXDUMP_ASCII BIT(0) #define HEXDUMP_SUPPRESS_REPEATED BIT(1) +#define HEXDUMP_2_GRP_LINES BIT(2) +#define HEXDUMP_4_GRP_LINES BIT(3) +#define HEXDUMP_8_GRP_LINES BIT(4) extern int hex_dump_to_buffer_ext(const void *buf, size_t len, int rowsize, int groupsize, char *linebuf, size_t linebuflen, diff --git a/lib/hexdump.c b/lib/hexdump.c index 1bf838c1a568..4dcf759fe048 100644 --- a/lib/hexdump.c +++ b/lib/hexdump.c @@ -77,6 +77,23 @@ char *bin2hex(char *dst, const void *src, size_t count) } EXPORT_SYMBOL(bin2hex); +static const char *group_separator(int group, u64 flags) +{ + if (group == 0) + return " "; + + if ((flags & HEXDUMP_8_GRP_LINES) && !((group) % 8)) + return "|"; + + if ((flags & HEXDUMP_4_GRP_LINES) && !((group) % 4)) + return "|"; + + if ((flags & HEXDUMP_2_GRP_LINES) && !((group) % 2)) + return "|"; + + return " "; +} + /** * hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory * @buf: data blob to dump @@ -87,6 +104,9 @@ EXPORT_SYMBOL(bin2hex); * @linebuflen: total size of @linebuf, including space for terminating NUL * @flags: A bitwise OR of the following flags: * HEXDUMP_ASCII: include ASCII after the hex output + * HEXDUMP_2_GRP_LINES: insert a '|' after every 2 groups + * HEXDUMP_4_GRP_LINES: insert a '|' after every 4 groups + * HEXDUMP_8_GRP_LINES: insert a '|' after every 8 groups * * hex_dump_to_buffer() works on one "line" of output at a time, converting * bytes of input to hexadecimal (and optionally printable ASCII) @@ -119,6 +139,7 @@ int hex_dump_to_buffer_ext(const void *buf, size_t len, int rowsize, int j, lx = 0; int ascii_column; int ret; + int line_chars = 0; if (!is_power_of_2(groupsize) || groupsize > 8) groupsize = 1; @@ -145,7 +166,8 @@ int hex_dump_to_buffer_ext(const void *buf, size_t len, int rowsize, for (j = 0; j < ngroups; j++) { ret = snprintf(linebuf + lx, linebuflen - lx, - "%s%16.16llx", j ? " " : "", + "%s%16.16llx", + j ? group_separator(j, flags) : "", get_unaligned(ptr8 + j)); if (ret >= linebuflen - lx) goto overflow1; @@ -156,7 +178,8 @@ int hex_dump_to_buffer_ext(const void *buf, size_t len, int rowsize, for (j = 0; j < ngroups; j++) { ret = snprintf(linebuf + lx, linebuflen - lx, - "%s%8.8x", j ? " " : "", + "%s%8.8x", + j ? group_separator(j, flags) : "", get_unaligned(ptr4 + j)); if (ret >= linebuflen - lx) goto overflow1; @@ -167,7 +190,8 @@ int hex_dump_to_buffer_ext(const void *buf, size_t len, int rowsize, for (j = 0; j < ngroups; j++) { ret = snprintf(linebuf + lx, linebuflen - lx, - "%s%4.4x", j ? " " : "", + "%s%4.4x", + j ? group_separator(j, flags) : "", get_unaligned(ptr2 + j)); if (ret >= linebuflen - lx) goto overflow1; @@ -197,11 +221,26 @@ int hex_dump_to_buffer_ext(const void *buf, size_t len, int rowsize, goto overflow2; linebuf[lx++] = ' '; } + + if (flags & HEXDUMP_2_GRP_LINES) + line_chars = groupsize * 2; + if (flags & HEXDUMP_4_GRP_LINES) + line_chars = groupsize * 4; + if (flags & HEXDUMP_8_GRP_LINES) + line_chars = groupsize * 8; + for (j = 0; j < len; j++) { if (linebuflen < lx + 2) goto overflow2; ch = ptr[j]; linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.'; + + if (line_chars && ((j + 1) < len) && + ((j + 1) % line_chars == 0)) { + if (linebuflen < lx + 2) + goto overflow2; + linebuf[lx++] = '|'; + } } nil: linebuf[lx] = '\0'; @@ -209,7 +248,8 @@ int hex_dump_to_buffer_ext(const void *buf, size_t len, int rowsize, overflow2: linebuf[lx++] = '\0'; overflow1: - return (flags & HEXDUMP_ASCII) ? ascii_column + len : + return (flags & HEXDUMP_ASCII) ? ascii_column + len + + (len - 1) / line_chars : (groupsize * 2 + 1) * ngroups - 1; } EXPORT_SYMBOL(hex_dump_to_buffer_ext); @@ -247,7 +287,7 @@ static void announce_skipped(const char *level, const char *prefix_str, if (count == 0) return; - printk("%s%s ** Skipped %lu bytes of value 0x%x **\n", + printk("%s%s ** Skipped %lu bytes of value 0x%02x **\n", level, prefix_str, count, val); } @@ -267,6 +307,9 @@ static void announce_skipped(const char *level, const char *prefix_str, * HEXDUMP_ASCII: include ASCII after the hex output * HEXDUMP_SUPPRESS_REPEATED: suppress repeated lines of identical * bytes + * HEXDUMP_2_GRP_LINES: insert a '|' after every 2 groups + * HEXDUMP_4_GRP_LINES: insert a '|' after every 4 groups + * HEXDUMP_8_GRP_LINES: insert a '|' after every 8 groups * * Given a buffer of u8 data, print_hex_dump() prints a hex + ASCII dump * to the kernel log at the specified kernel log level, with an optional @@ -296,15 +339,15 @@ void print_hex_dump_ext(const char *level, const char *prefix_str, u8 skipped_val = 0; size_t skipped = 0; - if (rowsize % groupsize) rowsize -= rowsize % groupsize; /* * Worst case line length: - * 2 hex chars + space per byte in, 2 spaces, 1 char per byte in, NULL + * 2 hex chars + space per byte in, 2 spaces, 1 char per byte in, + * 1 char per N groups, NULL */ - linebuf_len = rowsize * 3 + 2 + rowsize + 1; + linebuf_len = rowsize * 3 + 2 + rowsize + rowsize / groupsize + 1; linebuf = kzalloc(linebuf_len, GFP_KERNEL); if (!linebuf) { printk("%s%shexdump: Could not alloc %u bytes for buffer\n", -- 2.21.0