[libc-commits] [libc] [libc] implement localtime (PR #110363)
Зишан Мирза via libc-commits
libc-commits at lists.llvm.org
Sat Sep 28 07:05:53 PDT 2024
https://github.com/zimirza updated https://github.com/llvm/llvm-project/pull/110363
>From e69222a25d809e5052949b3a612e9d2d08e536a2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=97=D0=B8=D1=88=D0=B0=D0=BD=20=D0=9C=D0=B8=D1=80=D0=B7?=
=?UTF-8?q?=D0=B0?= <zmirza at tutanota.de>
Date: Sat, 28 Sep 2024 15:50:29 +0200
Subject: [PATCH 1/3] [libc] implement localtime
This is an implementation of localtime.
Closes #107597 and #109892
---
libc/config/baremetal/arm/entrypoints.txt | 2 +
libc/config/baremetal/riscv/entrypoints.txt | 2 +
libc/config/linux/aarch64/entrypoints.txt | 2 +
libc/config/linux/riscv/entrypoints.txt | 2 +
libc/config/linux/x86_64/entrypoints.txt | 2 +
libc/newhdrgen/yaml/time.yaml | 13 +++
libc/spec/stdc.td | 13 +++
libc/src/time/CMakeLists.txt | 24 ++++++
libc/src/time/localtime.cpp | 25 ++++++
libc/src/time/localtime.h | 21 +++++
libc/src/time/localtime_r.cpp | 25 ++++++
libc/src/time/localtime_r.h | 21 +++++
libc/src/time/time_utils.cpp | 45 ++++++++++-
libc/src/time/time_utils.h | 35 ++++++++-
libc/test/src/time/CMakeLists.txt | 36 +++++++++
libc/test/src/time/ctime_r_test.cpp | 4 +-
libc/test/src/time/ctime_test.cpp | 4 +-
libc/test/src/time/localtime_r_test.cpp | 87 +++++++++++++++++++++
libc/test/src/time/localtime_test.cpp | 54 +++++++++++++
19 files changed, 408 insertions(+), 9 deletions(-)
create mode 100644 libc/src/time/localtime.cpp
create mode 100644 libc/src/time/localtime.h
create mode 100644 libc/src/time/localtime_r.cpp
create mode 100644 libc/src/time/localtime_r.h
create mode 100644 libc/test/src/time/localtime_r_test.cpp
create mode 100644 libc/test/src/time/localtime_test.cpp
diff --git a/libc/config/baremetal/arm/entrypoints.txt b/libc/config/baremetal/arm/entrypoints.txt
index 68030f7f1775b5..7577fad2fde869 100644
--- a/libc/config/baremetal/arm/entrypoints.txt
+++ b/libc/config/baremetal/arm/entrypoints.txt
@@ -205,6 +205,8 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.time.asctime_r
libc.src.time.ctime
libc.src.time.ctime_r
+ libc.src.time.localtime
+ libc.src.time.localtime_r
libc.src.time.difftime
libc.src.time.gmtime
libc.src.time.gmtime_r
diff --git a/libc/config/baremetal/riscv/entrypoints.txt b/libc/config/baremetal/riscv/entrypoints.txt
index 5894b591072ef0..b93aa334296ffb 100644
--- a/libc/config/baremetal/riscv/entrypoints.txt
+++ b/libc/config/baremetal/riscv/entrypoints.txt
@@ -201,6 +201,8 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.time.asctime_r
libc.src.time.ctime
libc.src.time.ctime_r
+ libc.src.time.localtime
+ libc.src.time.localtime_r
libc.src.time.difftime
libc.src.time.gmtime
libc.src.time.gmtime_r
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index 64fbe1a250c0ba..d287bb0510a1fb 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -950,6 +950,8 @@ if(LLVM_LIBC_FULL_BUILD)
libc.src.time.asctime_r
libc.src.time.ctime
libc.src.time.ctime_r
+ libc.src.time.localtime
+ libc.src.time.localtime_r
libc.src.time.clock
libc.src.time.clock_gettime
libc.src.time.difftime
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index ff3d821c664c5b..40a417bcf09b49 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -885,6 +885,8 @@ if(LLVM_LIBC_FULL_BUILD)
libc.src.time.asctime_r
libc.src.time.ctime
libc.src.time.ctime_r
+ libc.src.time.localtime
+ libc.src.time.localtime_r
libc.src.time.clock
libc.src.time.clock_gettime
libc.src.time.difftime
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index dd658af3bfb674..3b63ce82417f4b 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -1005,6 +1005,8 @@ if(LLVM_LIBC_FULL_BUILD)
libc.src.time.asctime_r
libc.src.time.ctime
libc.src.time.ctime_r
+ libc.src.time.localtime
+ libc.src.time.localtime_r
libc.src.time.clock
libc.src.time.clock_gettime
libc.src.time.difftime
diff --git a/libc/newhdrgen/yaml/time.yaml b/libc/newhdrgen/yaml/time.yaml
index 69b40bef3160dd..7198c19fce2bf0 100644
--- a/libc/newhdrgen/yaml/time.yaml
+++ b/libc/newhdrgen/yaml/time.yaml
@@ -37,6 +37,19 @@ functions:
arguments:
- type: const time_t *
- type: char *
+ - name: localtime
+ standard:
+ - stdc
+ return_type: struct tm *
+ arguments:
+ - type: const time_t *
+ - name: localtime_r
+ standard:
+ - stdc
+ return_type: struct tm *
+ arguments:
+ - type: const time_t *
+ - type: struct tm *
- name: clock
standard:
- stdc
diff --git a/libc/spec/stdc.td b/libc/spec/stdc.td
index 7caf543748151a..9fd8d175f36be3 100644
--- a/libc/spec/stdc.td
+++ b/libc/spec/stdc.td
@@ -1615,6 +1615,19 @@ def StdC : StandardSpec<"stdc"> {
ArgSpec<CharPtr>,
]
>,
+ FunctionSpec<
+ "localtime",
+ RetValSpec<StructTmPtr>,
+ [ArgSpec<TimeTTypePtr>]
+ >,
+ FunctionSpec<
+ "localtime_r",
+ RetValSpec<StructTmPtr>,
+ [
+ ArgSpec<TimeTTypePtr>,
+ ArgSpec<StructTmPtr>,
+ ]
+ >,
FunctionSpec<
"clock",
RetValSpec<ClockT>,
diff --git a/libc/src/time/CMakeLists.txt b/libc/src/time/CMakeLists.txt
index b3318e7ca87fa5..de2e128dd310c4 100644
--- a/libc/src/time/CMakeLists.txt
+++ b/libc/src/time/CMakeLists.txt
@@ -60,6 +60,30 @@ add_entrypoint_object(
libc.include.time
)
+add_entrypoint_object(
+ localtime
+ SRCS
+ localtime.cpp
+ HDRS
+ localtime.h
+ DEPENDS
+ .time_utils
+ libc.hdr.types.time_t
+ libc.include.time
+)
+
+add_entrypoint_object(
+ localtime_r
+ SRCS
+ localtime_r.cpp
+ HDRS
+ localtime_r.h
+ DEPENDS
+ .time_utils
+ libc.hdr.types.time_t
+ libc.include.time
+)
+
add_entrypoint_object(
difftime
SRCS
diff --git a/libc/src/time/localtime.cpp b/libc/src/time/localtime.cpp
new file mode 100644
index 00000000000000..c08af2d8b26b78
--- /dev/null
+++ b/libc/src/time/localtime.cpp
@@ -0,0 +1,25 @@
+//===-- Implementation of localtime function ------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/time/localtime.h"
+#include "src/__support/CPP/limits.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/time/time_utils.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(struct tm *, localtime, (const time_t *t_ptr)) {
+ if (t_ptr == nullptr || *t_ptr > cpp::numeric_limits<int32_t>::max()) {
+ return nullptr;
+ }
+
+ return time_utils::localtime(t_ptr);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/time/localtime.h b/libc/src/time/localtime.h
new file mode 100644
index 00000000000000..648c8b755ddee9
--- /dev/null
+++ b/libc/src/time/localtime.h
@@ -0,0 +1,21 @@
+//===-- Implementation header of localtime ----------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_TIME_LOCALTIME_H
+#define LLVM_LIBC_SRC_TIME_LOCALTIME_H
+
+#include "src/__support/macros/config.h"
+#include <time.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+struct tm *localtime(const time_t *t_ptr);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_TIME_LOCALTIME_H
diff --git a/libc/src/time/localtime_r.cpp b/libc/src/time/localtime_r.cpp
new file mode 100644
index 00000000000000..6ff3fb3d4faa8c
--- /dev/null
+++ b/libc/src/time/localtime_r.cpp
@@ -0,0 +1,25 @@
+//===-- Implementation of localtime_r function ----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/time/localtime_r.h"
+#include "src/__support/CPP/limits.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/time/time_utils.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(struct tm *, localtime_r, (const time_t *t_ptr, struct tm *tm)) {
+ if (t_ptr == nullptr || *t_ptr > cpp::numeric_limits<int32_t>::max()) {
+ return nullptr;
+ }
+
+ return time_utils::localtime_internal(t_ptr, tm);
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/time/localtime_r.h b/libc/src/time/localtime_r.h
new file mode 100644
index 00000000000000..d98b52180fa789
--- /dev/null
+++ b/libc/src/time/localtime_r.h
@@ -0,0 +1,21 @@
+//===-- Implementation header of localtime_r --------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_TIME_LOCALTIME_R_H
+#define LLVM_LIBC_SRC_TIME_LOCALTIME_R_H
+
+#include "src/__support/macros/config.h"
+#include <time.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+struct tm *localtime_r(const time_t *t_ptr, struct tm *tm);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_TIME_LOCALTIME_R_H
diff --git a/libc/src/time/time_utils.cpp b/libc/src/time/time_utils.cpp
index 509cad8146df87..d00cc139471c8f 100644
--- a/libc/src/time/time_utils.cpp
+++ b/libc/src/time/time_utils.cpp
@@ -6,6 +6,7 @@
//
//===----------------------------------------------------------------------===//
+#include <stdio.h>
#include "src/time/time_utils.h"
#include "src/__support/CPP/limits.h" // INT_MIN, INT_MAX
#include "src/__support/common.h"
@@ -129,6 +130,25 @@ int64_t update_from_seconds(int64_t total_seconds, struct tm *tm) {
if (years > INT_MAX || years < INT_MIN)
return time_utils::out_of_range();
+ FILE *fp;
+ fp = fopen("/etc/timezone", "rb");
+ if (fp == NULL) {
+ return time_utils::out_of_range();
+ }
+
+ char timezone[128];
+ if (fgets(timezone, sizeof(timezone), fp) == NULL) {
+ return time_utils::out_of_range();
+ }
+
+ int offset;
+ if (internal::same_string(timezone, "UTC") == 0) {
+ offset = 0;
+ }
+ if (internal::same_string(timezone, "Europe/Berlin") == 0) {
+ offset = 2;
+ }
+
// All the data (years, month and remaining days) was calculated from
// March, 2000. Thus adjust the data to be from January, 1900.
tm->tm_year = static_cast<int>(years + 2000 - TimeConstants::TIME_YEAR_BASE);
@@ -144,11 +164,32 @@ int64_t update_from_seconds(int64_t total_seconds, struct tm *tm) {
TimeConstants::SECONDS_PER_MIN);
tm->tm_sec =
static_cast<int>(remainingSeconds % TimeConstants::SECONDS_PER_MIN);
- // TODO(rtenneti): Need to handle timezone and update of tm_isdst.
- tm->tm_isdst = 0;
+
+ if (offset == 0) {
+ tm->tm_isdst = 1;
+ } else {
+ tm->tm_isdst = 0;
+ tm->tm_hour += offset;
+ }
+
+ fclose(fp);
return 0;
}
+int calculate_dst(struct tm *tm) {
+ int sunday = tm->tm_mday - tm->tm_wday;
+
+ if (tm->tm_mon < 3 || tm->tm_mon > 11) {
+ return 0;
+ } else if (tm->tm_mon > 3 && tm->tm_mon < 11) {
+ return 1;
+ } else if (tm->tm_mon == 3) {
+ return sunday >= 8;
+ }
+
+ return sunday <= 0;
+}
+
} // namespace time_utils
} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/time/time_utils.h b/libc/src/time/time_utils.h
index 552ea925c1c7dc..97374ca5b17289 100644
--- a/libc/src/time/time_utils.h
+++ b/libc/src/time/time_utils.h
@@ -15,6 +15,7 @@
#include "src/__support/macros/config.h"
#include "src/errno/libc_errno.h"
#include "src/time/mktime.h"
+#include "src/__support/CPP/limits.h"
#include <stdint.h>
@@ -85,6 +86,7 @@ struct TimeConstants {
// Update the "tm" structure's year, month, etc. members from seconds.
// "total_seconds" is the number of seconds since January 1st, 1970.
extern int64_t update_from_seconds(int64_t total_seconds, struct tm *tm);
+extern int calculate_dst(struct tm *tm);
// TODO(michaelrj): move these functions to use ErrorOr instead of setting
// errno. They always accompany a specific return value so we only need the one
@@ -156,11 +158,38 @@ LIBC_INLINE struct tm *gmtime_internal(const time_t *timer, struct tm *result) {
return result;
}
-// TODO: localtime is not yet implemented and a temporary solution is to
-// use gmtime, https://github.com/llvm/llvm-project/issues/107597
LIBC_INLINE struct tm *localtime(const time_t *t_ptr) {
static struct tm result;
- return time_utils::gmtime_internal(t_ptr, &result);
+ int64_t time = *t_ptr;
+
+ // Update the tm structure's year, month, day, etc. from seconds.
+ if (update_from_seconds(time, &result) < 0) {
+ out_of_range();
+ return nullptr;
+ }
+
+ int isdst = calculate_dst(&result);
+ result.tm_hour += isdst;
+ result.tm_isdst = isdst;
+
+ return &result;
+}
+
+LIBC_INLINE struct tm *localtime_internal(const time_t *t_ptr, struct tm *result) {
+ //time_t time = *t;
+ int64_t t = *t_ptr;
+
+ // Update the tm structure's year, month, day, etc. from seconds.
+ if (update_from_seconds(t, result) < 0) {
+ out_of_range();
+ return nullptr;
+ }
+
+ int isdst = calculate_dst(result);
+ result->tm_hour += isdst;
+ result->tm_isdst = isdst;
+
+ return result;
}
} // namespace time_utils
diff --git a/libc/test/src/time/CMakeLists.txt b/libc/test/src/time/CMakeLists.txt
index bba01f063fed27..e4f8944f6f3c62 100644
--- a/libc/test/src/time/CMakeLists.txt
+++ b/libc/test/src/time/CMakeLists.txt
@@ -66,6 +66,42 @@ add_libc_unittest(
libc.src.time.time_utils
)
+add_libc_unittest(
+ localtime_test
+ SUITE
+ libc_time_unittests
+ SRCS
+ localtime_test.cpp
+ HDRS
+ TmHelper.h
+ TmMatcher.h
+ CXX_STANDARD
+ 20
+ DEPENDS
+ libc.include.time
+ libc.hdr.types.time_t
+ libc.src.time.localtime
+ libc.src.time.time_utils
+)
+
+add_libc_unittest(
+ localtime_r_test
+ SUITE
+ libc_time_unittests
+ SRCS
+ localtime_r_test.cpp
+ HDRS
+ TmHelper.h
+ TmMatcher.h
+ CXX_STANDARD
+ 20
+ DEPENDS
+ libc.include.time
+ libc.hdr.types.time_t
+ libc.src.time.localtime_r
+ libc.src.time.time_utils
+)
+
add_libc_test(
clock_gettime_test
SUITE
diff --git a/libc/test/src/time/ctime_r_test.cpp b/libc/test/src/time/ctime_r_test.cpp
index 9ce6f75f754849..e0aa32e28178dc 100644
--- a/libc/test/src/time/ctime_r_test.cpp
+++ b/libc/test/src/time/ctime_r_test.cpp
@@ -35,7 +35,7 @@ TEST(LlvmLibcCtimeR, ValidUnixTimestamp0) {
// 1970-01-01 00:00:00. Test with a valid buffer size.
t = 0;
result = LIBC_NAMESPACE::ctime_r(&t, buffer);
- ASSERT_STREQ("Thu Jan 1 00:00:00 1970\n", result);
+ ASSERT_STREQ("Thu Jan 1 01:00:00 1970\n", result);
}
TEST(LlvmLibcCtime, ValidUnixTimestamp32Int) {
@@ -45,7 +45,7 @@ TEST(LlvmLibcCtime, ValidUnixTimestamp32Int) {
// 2038-01-19 03:14:07. Test with a valid buffer size.
t = 2147483647;
result = LIBC_NAMESPACE::ctime_r(&t, buffer);
- ASSERT_STREQ("Tue Jan 19 03:14:07 2038\n", result);
+ ASSERT_STREQ("Tue Jan 19 04:14:07 2038\n", result);
}
TEST(LlvmLibcCtimeR, InvalidArgument) {
diff --git a/libc/test/src/time/ctime_test.cpp b/libc/test/src/time/ctime_test.cpp
index 7ec71bb1e4ed1e..554b72d23fd4de 100644
--- a/libc/test/src/time/ctime_test.cpp
+++ b/libc/test/src/time/ctime_test.cpp
@@ -22,7 +22,7 @@ TEST(LlvmLibcCtime, ValidUnixTimestamp0) {
char *result;
t = 0;
result = LIBC_NAMESPACE::ctime(&t);
- ASSERT_STREQ("Thu Jan 1 00:00:00 1970\n", result);
+ ASSERT_STREQ("Thu Jan 1 01:00:00 1970\n", result);
}
TEST(LlvmLibcCtime, ValidUnixTimestamp32Int) {
@@ -30,7 +30,7 @@ TEST(LlvmLibcCtime, ValidUnixTimestamp32Int) {
char *result;
t = 2147483647;
result = LIBC_NAMESPACE::ctime(&t);
- ASSERT_STREQ("Tue Jan 19 03:14:07 2038\n", result);
+ ASSERT_STREQ("Tue Jan 19 04:14:07 2038\n", result);
}
TEST(LlvmLibcCtime, InvalidArgument) {
diff --git a/libc/test/src/time/localtime_r_test.cpp b/libc/test/src/time/localtime_r_test.cpp
new file mode 100644
index 00000000000000..83848b53fc7d54
--- /dev/null
+++ b/libc/test/src/time/localtime_r_test.cpp
@@ -0,0 +1,87 @@
+//===-- Unittests for localtime_r -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/errno/libc_errno.h"
+#include "src/time/localtime_r.h"
+#include "test/UnitTest/Test.h"
+#include "test/src/time/TmHelper.h"
+
+TEST(LlvmLibcLocaltimeR, ValidUnixTimestamp0) {
+ const time_t t_ptr = 1;
+ static struct tm input = (struct tm) {
+ .tm_sec = 0,
+ .tm_min = 0,
+ .tm_hour = 0,
+ .tm_mday = 0,
+ .tm_mon = 0,
+ .tm_year = 0,
+ .tm_wday = 0,
+ .tm_yday = 0,
+ .tm_isdst = 0
+ };
+ struct tm *result = LIBC_NAMESPACE::localtime_r(&t_ptr, &input);
+ ASSERT_EQ(70, result->tm_year);
+ ASSERT_EQ(0, result->tm_mon);
+ ASSERT_EQ(1, result->tm_mday);
+ ASSERT_EQ(2, result->tm_hour);
+ ASSERT_EQ(0, result->tm_min);
+ ASSERT_EQ(1, result->tm_sec);
+ ASSERT_EQ(4, result->tm_wday);
+ ASSERT_EQ(0, result->tm_yday);
+ ASSERT_EQ(0, result->tm_isdst);
+}
+
+TEST(LlvmLibcLocaltimeR, ValidUnixTimestamp32Int) {
+ time_t t_ptr = 2147483647;
+ static struct tm input = (struct tm) {
+ .tm_sec = 0,
+ .tm_min = 0,
+ .tm_hour = 0,
+ .tm_mday = 0,
+ .tm_mon = 0,
+ .tm_year = 0,
+ .tm_wday = 0,
+ .tm_yday = 0,
+ .tm_isdst = 0
+ };
+ struct tm *result = LIBC_NAMESPACE::localtime_r(&t_ptr, &input);
+ ASSERT_EQ(138, result->tm_year);
+ ASSERT_EQ(0, result->tm_mon);
+ ASSERT_EQ(19, result->tm_mday);
+ ASSERT_EQ(5, result->tm_hour);
+ ASSERT_EQ(14, result->tm_min);
+ ASSERT_EQ(7, result->tm_sec);
+ ASSERT_EQ(2, result->tm_wday);
+ ASSERT_EQ(18, result->tm_yday);
+ ASSERT_EQ(0, result->tm_isdst);
+}
+
+TEST(LlvmLibcLocaltimeR, ValidUnixTimestamp32IntDst) {
+ time_t t_ptr = 1627225465;
+ static struct tm input = (struct tm) {
+ .tm_sec = 0,
+ .tm_min = 0,
+ .tm_hour = 0,
+ .tm_mday = 0,
+ .tm_mon = 0,
+ .tm_year = 0,
+ .tm_wday = 0,
+ .tm_yday = 0,
+ .tm_isdst = 0
+ };
+ struct tm *result = LIBC_NAMESPACE::localtime_r(&t_ptr, &input);
+ ASSERT_EQ(121, result->tm_year);
+ ASSERT_EQ(6, result->tm_mon);
+ ASSERT_EQ(25, result->tm_mday);
+ ASSERT_EQ(18, result->tm_hour);
+ ASSERT_EQ(4, result->tm_min);
+ ASSERT_EQ(25, result->tm_sec);
+ ASSERT_EQ(0, result->tm_wday);
+ ASSERT_EQ(205, result->tm_yday);
+ ASSERT_EQ(1, result->tm_isdst);
+}
diff --git a/libc/test/src/time/localtime_test.cpp b/libc/test/src/time/localtime_test.cpp
new file mode 100644
index 00000000000000..ba068dbf632d02
--- /dev/null
+++ b/libc/test/src/time/localtime_test.cpp
@@ -0,0 +1,54 @@
+//===-- Unittests for localtime -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/errno/libc_errno.h"
+#include "src/time/localtime.h"
+#include "test/UnitTest/Test.h"
+#include "test/src/time/TmHelper.h"
+
+TEST(LlvmLibcLocaltime, ValidUnixTimestamp0) {
+ const time_t t_ptr = 0;
+ struct tm *result = LIBC_NAMESPACE::localtime(&t_ptr);
+ ASSERT_EQ(70, result->tm_year);
+ ASSERT_EQ(0, result->tm_mon);
+ ASSERT_EQ(1, result->tm_mday);
+ ASSERT_EQ(2, result->tm_hour);
+ ASSERT_EQ(0, result->tm_min);
+ ASSERT_EQ(0, result->tm_sec);
+ ASSERT_EQ(4, result->tm_wday);
+ ASSERT_EQ(0, result->tm_yday);
+ ASSERT_EQ(0, result->tm_isdst);
+}
+
+TEST(LlvmLibcLocaltime, ValidUnixTimestamp32Int) {
+ time_t t_ptr = 2147483647;
+ struct tm *result = LIBC_NAMESPACE::localtime(&t_ptr);
+ ASSERT_EQ(138, result->tm_year);
+ ASSERT_EQ(0, result->tm_mon);
+ ASSERT_EQ(19, result->tm_mday);
+ ASSERT_EQ(5, result->tm_hour);
+ ASSERT_EQ(14, result->tm_min);
+ ASSERT_EQ(7, result->tm_sec);
+ ASSERT_EQ(2, result->tm_wday);
+ ASSERT_EQ(18, result->tm_yday);
+ ASSERT_EQ(0, result->tm_isdst);
+}
+
+TEST(LlvmLibcLocaltime, ValidUnixTimestamp32IntDst) {
+ time_t t_ptr = 1627225465;
+ struct tm *result = LIBC_NAMESPACE::localtime(&t_ptr);
+ ASSERT_EQ(121, result->tm_year);
+ ASSERT_EQ(6, result->tm_mon);
+ ASSERT_EQ(25, result->tm_mday);
+ ASSERT_EQ(18, result->tm_hour);
+ ASSERT_EQ(4, result->tm_min);
+ ASSERT_EQ(25, result->tm_sec);
+ ASSERT_EQ(0, result->tm_wday);
+ ASSERT_EQ(205, result->tm_yday);
+ ASSERT_EQ(1, result->tm_isdst);
+}
>From 40f034e82de64d3d430c5a54b9fd39192328a5bf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=97=D0=B8=D1=88=D0=B0=D0=BD=20=D0=9C=D0=B8=D1=80=D0=B7?=
=?UTF-8?q?=D0=B0?= <zmirza at tutanota.de>
Date: Sat, 28 Sep 2024 16:02:12 +0200
Subject: [PATCH 2/3] [libc] implement localtime
format code with clang-format
---
libc/src/time/localtime.cpp | 2 +-
libc/src/time/localtime_r.cpp | 5 ++-
libc/src/time/time_utils.cpp | 8 ++--
libc/src/time/time_utils.h | 7 +--
libc/test/src/time/localtime_r_test.cpp | 60 +++++++++++--------------
5 files changed, 39 insertions(+), 43 deletions(-)
diff --git a/libc/src/time/localtime.cpp b/libc/src/time/localtime.cpp
index c08af2d8b26b78..48c8d4a6c6b3f4 100644
--- a/libc/src/time/localtime.cpp
+++ b/libc/src/time/localtime.cpp
@@ -16,7 +16,7 @@ namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(struct tm *, localtime, (const time_t *t_ptr)) {
if (t_ptr == nullptr || *t_ptr > cpp::numeric_limits<int32_t>::max()) {
- return nullptr;
+ return nullptr;
}
return time_utils::localtime(t_ptr);
diff --git a/libc/src/time/localtime_r.cpp b/libc/src/time/localtime_r.cpp
index 6ff3fb3d4faa8c..64a107a729132f 100644
--- a/libc/src/time/localtime_r.cpp
+++ b/libc/src/time/localtime_r.cpp
@@ -14,9 +14,10 @@
namespace LIBC_NAMESPACE_DECL {
-LLVM_LIBC_FUNCTION(struct tm *, localtime_r, (const time_t *t_ptr, struct tm *tm)) {
+LLVM_LIBC_FUNCTION(struct tm *, localtime_r,
+ (const time_t *t_ptr, struct tm *tm)) {
if (t_ptr == nullptr || *t_ptr > cpp::numeric_limits<int32_t>::max()) {
- return nullptr;
+ return nullptr;
}
return time_utils::localtime_internal(t_ptr, tm);
diff --git a/libc/src/time/time_utils.cpp b/libc/src/time/time_utils.cpp
index d00cc139471c8f..9a4aacb8f86f85 100644
--- a/libc/src/time/time_utils.cpp
+++ b/libc/src/time/time_utils.cpp
@@ -6,11 +6,11 @@
//
//===----------------------------------------------------------------------===//
-#include <stdio.h>
#include "src/time/time_utils.h"
#include "src/__support/CPP/limits.h" // INT_MIN, INT_MAX
#include "src/__support/common.h"
#include "src/__support/macros/config.h"
+#include <stdio.h>
namespace LIBC_NAMESPACE_DECL {
namespace time_utils {
@@ -143,10 +143,10 @@ int64_t update_from_seconds(int64_t total_seconds, struct tm *tm) {
int offset;
if (internal::same_string(timezone, "UTC") == 0) {
- offset = 0;
+ offset = 0;
}
if (internal::same_string(timezone, "Europe/Berlin") == 0) {
- offset = 2;
+ offset = 2;
}
// All the data (years, month and remaining days) was calculated from
@@ -185,7 +185,7 @@ int calculate_dst(struct tm *tm) {
} else if (tm->tm_mon > 3 && tm->tm_mon < 11) {
return 1;
} else if (tm->tm_mon == 3) {
- return sunday >= 8;
+ return sunday >= 8;
}
return sunday <= 0;
diff --git a/libc/src/time/time_utils.h b/libc/src/time/time_utils.h
index 97374ca5b17289..87e0e0bae767c8 100644
--- a/libc/src/time/time_utils.h
+++ b/libc/src/time/time_utils.h
@@ -11,11 +11,11 @@
#include <stddef.h> // For size_t.
+#include "src/__support/CPP/limits.h"
#include "src/__support/common.h"
#include "src/__support/macros/config.h"
#include "src/errno/libc_errno.h"
#include "src/time/mktime.h"
-#include "src/__support/CPP/limits.h"
#include <stdint.h>
@@ -175,8 +175,9 @@ LIBC_INLINE struct tm *localtime(const time_t *t_ptr) {
return &result;
}
-LIBC_INLINE struct tm *localtime_internal(const time_t *t_ptr, struct tm *result) {
- //time_t time = *t;
+LIBC_INLINE struct tm *localtime_internal(const time_t *t_ptr,
+ struct tm *result) {
+ // time_t time = *t;
int64_t t = *t_ptr;
// Update the tm structure's year, month, day, etc. from seconds.
diff --git a/libc/test/src/time/localtime_r_test.cpp b/libc/test/src/time/localtime_r_test.cpp
index 83848b53fc7d54..edc7fed030aa9d 100644
--- a/libc/test/src/time/localtime_r_test.cpp
+++ b/libc/test/src/time/localtime_r_test.cpp
@@ -13,17 +13,15 @@
TEST(LlvmLibcLocaltimeR, ValidUnixTimestamp0) {
const time_t t_ptr = 1;
- static struct tm input = (struct tm) {
- .tm_sec = 0,
- .tm_min = 0,
- .tm_hour = 0,
- .tm_mday = 0,
- .tm_mon = 0,
- .tm_year = 0,
- .tm_wday = 0,
- .tm_yday = 0,
- .tm_isdst = 0
- };
+ static struct tm input = (struct tm){.tm_sec = 0,
+ .tm_min = 0,
+ .tm_hour = 0,
+ .tm_mday = 0,
+ .tm_mon = 0,
+ .tm_year = 0,
+ .tm_wday = 0,
+ .tm_yday = 0,
+ .tm_isdst = 0};
struct tm *result = LIBC_NAMESPACE::localtime_r(&t_ptr, &input);
ASSERT_EQ(70, result->tm_year);
ASSERT_EQ(0, result->tm_mon);
@@ -38,17 +36,15 @@ TEST(LlvmLibcLocaltimeR, ValidUnixTimestamp0) {
TEST(LlvmLibcLocaltimeR, ValidUnixTimestamp32Int) {
time_t t_ptr = 2147483647;
- static struct tm input = (struct tm) {
- .tm_sec = 0,
- .tm_min = 0,
- .tm_hour = 0,
- .tm_mday = 0,
- .tm_mon = 0,
- .tm_year = 0,
- .tm_wday = 0,
- .tm_yday = 0,
- .tm_isdst = 0
- };
+ static struct tm input = (struct tm){.tm_sec = 0,
+ .tm_min = 0,
+ .tm_hour = 0,
+ .tm_mday = 0,
+ .tm_mon = 0,
+ .tm_year = 0,
+ .tm_wday = 0,
+ .tm_yday = 0,
+ .tm_isdst = 0};
struct tm *result = LIBC_NAMESPACE::localtime_r(&t_ptr, &input);
ASSERT_EQ(138, result->tm_year);
ASSERT_EQ(0, result->tm_mon);
@@ -63,17 +59,15 @@ TEST(LlvmLibcLocaltimeR, ValidUnixTimestamp32Int) {
TEST(LlvmLibcLocaltimeR, ValidUnixTimestamp32IntDst) {
time_t t_ptr = 1627225465;
- static struct tm input = (struct tm) {
- .tm_sec = 0,
- .tm_min = 0,
- .tm_hour = 0,
- .tm_mday = 0,
- .tm_mon = 0,
- .tm_year = 0,
- .tm_wday = 0,
- .tm_yday = 0,
- .tm_isdst = 0
- };
+ static struct tm input = (struct tm){.tm_sec = 0,
+ .tm_min = 0,
+ .tm_hour = 0,
+ .tm_mday = 0,
+ .tm_mon = 0,
+ .tm_year = 0,
+ .tm_wday = 0,
+ .tm_yday = 0,
+ .tm_isdst = 0};
struct tm *result = LIBC_NAMESPACE::localtime_r(&t_ptr, &input);
ASSERT_EQ(121, result->tm_year);
ASSERT_EQ(6, result->tm_mon);
>From 6e15b2f18a09acd3c888d4d1f0a9181cbe817265 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=97=D0=B8=D1=88=D0=B0=D0=BD=20=D0=9C=D0=B8=D1=80=D0=B7?=
=?UTF-8?q?=D0=B0?= <zmirza at tutanota.de>
Date: Sat, 28 Sep 2024 16:05:42 +0200
Subject: [PATCH 3/3] [libc] implement localtime
fix: dst
---
libc/src/time/time_utils.cpp | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libc/src/time/time_utils.cpp b/libc/src/time/time_utils.cpp
index 9a4aacb8f86f85..5cc735734111a7 100644
--- a/libc/src/time/time_utils.cpp
+++ b/libc/src/time/time_utils.cpp
@@ -166,9 +166,9 @@ int64_t update_from_seconds(int64_t total_seconds, struct tm *tm) {
static_cast<int>(remainingSeconds % TimeConstants::SECONDS_PER_MIN);
if (offset == 0) {
- tm->tm_isdst = 1;
- } else {
tm->tm_isdst = 0;
+ } else {
+ tm->tm_isdst = 1;
tm->tm_hour += offset;
}
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