Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753725Ab2FLPno (ORCPT ); Tue, 12 Jun 2012 11:43:44 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:61603 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753515Ab2FLPjs (ORCPT ); Tue, 12 Jun 2012 11:39:48 -0400 From: Kent Overstreet To: linux-bcache@vger.kernel.org, linux-kernel@vger.kernel.org, dm-devel@redhat.com Cc: Kent Overstreet , tejun@google.com, agk@redhat.com, dan.j.williams@intel.com Subject: [Bcache v14 04/16] Add human-readable units modifier to vsnprintf() Date: Tue, 12 Jun 2012 08:39:10 -0700 Message-Id: <1339515562-14638-5-git-send-email-koverstreet@google.com> X-Mailer: git-send-email 1.7.9.3.327.g2980b In-Reply-To: <1339515562-14638-1-git-send-email-koverstreet@google.com> References: <1339515562-14638-1-git-send-email-koverstreet@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2107 Lines: 70 Signed-off-by: Kent Overstreet --- lib/vsprintf.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/lib/vsprintf.c b/lib/vsprintf.c index c3f36d41..16149dd 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -338,6 +338,7 @@ int num_to_str(char *buf, int size, unsigned long long num) #define LEFT 16 /* left justified */ #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ +#define HUNITS 128 /* Human readable units, i.e. k/M/G/T */ enum format_type { FORMAT_TYPE_NONE, /* Just a string part */ @@ -377,6 +378,7 @@ char *number(char *buf, char *end, unsigned long long num, { /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ + static const char units[] = "?kMGTPEZY"; char tmp[66]; char sign; @@ -431,7 +433,26 @@ char *number(char *buf, char *end, unsigned long long num, num >>= shift; } while (num); } else { /* base 10 */ - i = put_dec(tmp, num) - tmp; + if (spec.flags & HUNITS) { + int u, rem = 0; + + for (u = 0; num >= 1024; u++) { + rem = num & ~(~0 << 10); + num >>= 10; + } + + if (u) { + tmp[i++] = units[u]; + + if (num < 100) { + rem /= 100; + i = put_dec(tmp + i, rem) - tmp; + tmp[i++] = '.'; + } + } + } + + i = put_dec(tmp + i, num) - tmp; } /* printing 100 using %2d gives "100", not "00" */ @@ -1127,6 +1148,7 @@ int format_decode(const char *fmt, struct printf_spec *spec) case ' ': spec->flags |= SPACE; break; case '#': spec->flags |= SPECIAL; break; case '0': spec->flags |= ZEROPAD; break; + case 'h': spec->flags |= HUNITS; break; default: found = false; } -- 1.7.9.3.327.g2980b -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/