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X-Received-From: 192.55.52.93 Subject: [Qemu-devel] [PATCH v11 01/11] util/cutils: Add qemu_strtotime_ps() 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: jingqi.liu@intel.com, tao3.xu@intel.com, fan.du@intel.com, qemu-devel@nongnu.org, jonathan.cameron@huawei.com, dan.j.williams@intel.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" To convert strings with time suffixes to numbers, support time unit are "ps" for picosecond, "ns" for nanosecond, "us" for microsecond, "ms" for millisecond or "s" for second. Signed-off-by: Tao Xu --- No changes in v11. New patch in v10. --- include/qemu/cutils.h | 1 + util/cutils.c | 82 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 83 insertions(+) diff --git a/include/qemu/cutils.h b/include/qemu/cutils.h index 12301340a4..0e70a807e1 100644 --- a/include/qemu/cutils.h +++ b/include/qemu/cutils.h @@ -180,5 +180,6 @@ int uleb128_decode_small(const uint8_t *in, uint32_t *n= ); * *str1 is <, =3D=3D or > than *str2. */ int qemu_pstrcmp0(const char **str1, const char **str2); +int qemu_strtotime_ps(const char *nptr, const char **end, uint64_t *result= ); =20 #endif diff --git a/util/cutils.c b/util/cutils.c index fd591cadf0..a50c15f46a 100644 --- a/util/cutils.c +++ b/util/cutils.c @@ -847,3 +847,85 @@ int qemu_pstrcmp0(const char **str1, const char **str2) { return g_strcmp0(*str1, *str2); } + +static int64_t timeunit_mul(const char *unitstr) +{ + if (g_strcmp0(unitstr, "ps") =3D=3D 0) { + return 1; + } else if (g_strcmp0(unitstr, "ns") =3D=3D 0) { + return 1000; + } else if (g_strcmp0(unitstr, "us") =3D=3D 0) { + return 1000000; + } else if (g_strcmp0(unitstr, "ms") =3D=3D 0) { + return 1000000000LL; + } else if (g_strcmp0(unitstr, "s") =3D=3D 0) { + return 1000000000000LL; + } else { + return -1; + } +} + + +/* + * Convert string to time, support time unit are ps for picosecond, + * ns for nanosecond, us for microsecond, ms for millisecond or s for seco= nd. + * End pointer will be returned in *end, if not NULL. Return -ERANGE on + * overflow, and -EINVAL on other error. + */ +static int do_strtotime(const char *nptr, const char **end, + const char *default_unit, uint64_t *result) +{ + int retval; + const char *endptr; + int mul_required =3D 0; + int64_t mul; + double val, integral, fraction; + + retval =3D qemu_strtod_finite(nptr, &endptr, &val); + if (retval) { + goto out; + } + fraction =3D modf(val, &integral); + if (fraction !=3D 0) { + mul_required =3D 1; + } + + mul =3D timeunit_mul(endptr); + + if (mul =3D=3D 1000000000000LL) { + endptr++; + } else if (mul !=3D -1) { + endptr +=3D 2; + } else { + mul =3D timeunit_mul(default_unit); + assert(mul >=3D 0); + } + if (mul =3D=3D 1 && mul_required) { + retval =3D -EINVAL; + goto out; + } + /* + * Values >=3D 0xfffffffffffffc00 overflow uint64_t after their trip + * through double (53 bits of precision). + */ + if ((val * (double)mul >=3D 0xfffffffffffffc00) || val < 0) { + retval =3D -ERANGE; + goto out; + } + *result =3D val * (double)mul; + retval =3D 0; + +out: + if (end) { + *end =3D endptr; + } else if (*endptr) { + retval =3D -EINVAL; + } + + return retval; +} + +int qemu_strtotime_ps(const char *nptr, const char **end, uint64_t *result) +{ + return do_strtotime(nptr, end, "ps", result); +} --=20 2.20.1