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[83.53.161.74]) by smtp.gmail.com with ESMTPSA id y6sm9007187wrn.41.2020.09.27.02.08.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Sep 2020 02:08:23 -0700 (PDT) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH 1/3] util/cutils: Introduce freq_to_str() to display Hertz units Date: Sun, 27 Sep 2020 11:08:18 +0200 Message-Id: <20200927090820.61859-2-f4bug@amsat.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200927090820.61859-1-f4bug@amsat.org> References: <20200927090820.61859-1-f4bug@amsat.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::333; envelope-from=philippe.mathieu.daude@gmail.com; helo=mail-wm1-x333.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.001, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Damien Hedde , "Edgar E . Iglesias" , Luc Michel , Eduardo Habkost , Peter Maydell , Havard Skinnemoen , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Tyrone Ting , Alistair Francis Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Introduce freq_to_str() to convert frequency values in human friendly units using the SI units for Hertz. Signed-off-by: Philippe Mathieu-Daudé --- include/qemu/cutils.h | 12 ++++++++++++ util/cutils.c | 10 ++++++++++ 2 files changed, 22 insertions(+) diff --git a/include/qemu/cutils.h b/include/qemu/cutils.h index eb59852dfdf..0186c846e9c 100644 --- a/include/qemu/cutils.h +++ b/include/qemu/cutils.h @@ -158,6 +158,18 @@ int qemu_strtosz_metric(const char *nptr, const char **end, uint64_t *result); char *size_to_str(uint64_t val); +/** + * freq_to_str: + * @freq_hz: frequency to stringify + * + * Return human readable string for frequency @freq_hz. + * Use SI units like KHz, MHz, and so forth. + * + * The caller is responsible for releasing the value returned with g_free() + * after use. + */ +char *freq_to_str(uint64_t freq_hz); + /* used to print char* safely */ #define STR_OR_NULL(str) ((str) ? (str) : "null") diff --git a/util/cutils.c b/util/cutils.c index 36ce712271f..dab837fd8b8 100644 --- a/util/cutils.c +++ b/util/cutils.c @@ -885,6 +885,16 @@ char *size_to_str(uint64_t val) return g_strdup_printf("%0.3g %sB", (double)val / div, suffixes[i]); } +char *freq_to_str(uint64_t freq_hz) +{ + static const char *suffixes[] = { "", "K", "M", "G", "T", "P", "E" }; + unsigned unit_index = log10(freq_hz) / 3; + + return g_strdup_printf("%0.3g %sHz", + freq_hz / pow(10.0, unit_index * 3.0), + suffixes[unit_index]); +} + int qemu_pstrcmp0(const char **str1, const char **str2) { return g_strcmp0(*str1, *str2);