From ee93be501e479668b27c416522ca9282c11f0ef2 Mon Sep 17 00:00:00 2001
From: Mitya Selivanov <automainint@guattari.tech>
Date: Sun, 1 Jan 2023 17:32:57 +0100
Subject: Refactor: remove custom time.h, use _GNU_SOURCE instead

---
 CMakeLists.txt             | 65 +---------------------------------------------
 source/kit/CMakeLists.txt  |  3 +--
 source/kit/mutex.h         |  4 ++-
 source/kit/secure_random.c |  2 +-
 source/kit/secure_random.h |  2 ++
 source/kit/thread.h        |  4 ++-
 source/kit/time.c          | 65 ----------------------------------------------
 source/kit/time.h          | 33 -----------------------
 8 files changed, 11 insertions(+), 167 deletions(-)
 delete mode 100644 source/kit/time.c
 delete mode 100644 source/kit/time.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f24fe6f..07b2738 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,53 +33,6 @@ endif()
 
 include(CheckCSourceRuns)
 
-check_c_source_runs(
-  "
-  #include <time.h>
-  int main() {
-    struct timespec t;
-    (void) t.tv_sec;
-    (void) t.tv_nsec;
-    return 0;
-  }
-  "
-  KIT_HAVE_STRUCT_TIMESPEC
-)
-
-check_c_source_runs(
-  "
-  #include <bits/types/struct_timespec.h>
-  int main() {
-    return 0;
-  }
-  "
-  KIT_HAVE_BITS_TYPES_STRUCT_TIMESPEC_H
-)
-
-check_c_source_runs(
-  "
-  #include <time.h>
-  int main() {
-    struct timespec t;
-    timespec_get(&t, TIME_UTC);
-    return 0;
-  }
-  "
-  KIT_HAVE_TIMESPEC_GET
-)
-
-check_c_source_runs(
-  "
-  #include <time.h>
-  int main() {
-    struct timespec t;
-    clock_gettime(CLOCK_REALTIME, &t)
-    return 0;
-  }
-  "
-  KIT_HAVE_CLOCK_GETTIME
-)
-
 check_c_source_runs(
   "
   #include <pthread.h>
@@ -105,7 +58,7 @@ check_c_source_runs(
 
 check_c_source_runs(
   "
-  #include <windows.h>
+  #include <Windows.h>
   int main() {
     return 0;
   }
@@ -133,22 +86,6 @@ if(NOT KIT_HAVE_MALLOC)
   set(KIT_DISABLE_SYSTEM_MALLOC ON)
 endif()
 
-if(NOT KIT_HAVE_STRUCT_TIMESPEC)
-  target_compile_definitions(kit PUBLIC KIT_NEED_STRUCT_TIMESPEC)
-endif()
-
-if(KIT_HAVE_BITS_TYPES_STRUCT_TIMESPEC_H)
-  target_compile_definitions(kit PUBLIC KIT_HAVE_BITS_TYPES_STRUCT_TIMESPEC_H)
-endif()
-
-if(NOT KIT_HAVE_TIMESPEC_GET)
-  target_compile_definitions(kit PUBLIC KIT_NEED_TIMESPEC_GET)
-endif()
-
-if(KIT_HAVE_CLOCK_GETTIME)
-  target_compile_definitions(kit PUBLIC KIT_HAVE_CLOCK_GETTIME)
-endif()
-
 if(KIT_HAVE_PTHREAD_MUTEXATTR_SETTYPE)
   target_compile_definitions(kit PUBLIC KIT_HAVE_PTHREAD_MUTEXATTR_SETTYPE)
 endif()
diff --git a/source/kit/CMakeLists.txt b/source/kit/CMakeLists.txt
index b672a80..101e2a8 100644
--- a/source/kit/CMakeLists.txt
+++ b/source/kit/CMakeLists.txt
@@ -1,7 +1,7 @@
 target_sources(
   kit
     PRIVATE
-      input_buffer.c bigint.c status.c time.c secure_random.c
+      input_buffer.c bigint.c status.c secure_random.c
       thread.posix.c atomic.win32.c condition_variable.c thread.win32.c
       move_back.c input_stream.c lower_bound.c file.c string_ref.c
       async_function.c allocator.c array_ref.c dynamic_array.c mutex.c
@@ -9,7 +9,6 @@ target_sources(
     PUBLIC
       $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/mutex.h>
       $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/status.h>
-      $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/time.h>
       $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/atomic.h>
       $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/allocator.h>
       $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/string_ref.h>
diff --git a/source/kit/mutex.h b/source/kit/mutex.h
index 6d2d230..7816301 100644
--- a/source/kit/mutex.h
+++ b/source/kit/mutex.h
@@ -3,7 +3,9 @@
 
 #ifndef KIT_DISABLE_SYSTEM_THREADS
 #  include "thread_defs.h"
-#  include "time.h"
+
+#  define _GNU_SOURCE
+#  include <time.h>
 
 #  if !defined(_WIN32) || defined(__CYGWIN__)
 #    include <pthread.h>
diff --git a/source/kit/secure_random.c b/source/kit/secure_random.c
index 3112167..5629daf 100644
--- a/source/kit/secure_random.c
+++ b/source/kit/secure_random.c
@@ -3,7 +3,7 @@
 #include "condition_variable.h"
 #include "mersenne_twister_64.h"
 #include "mutex.h"
-#include "time.h"
+
 #include <assert.h>
 #include <stdio.h>
 
diff --git a/source/kit/secure_random.h b/source/kit/secure_random.h
index 758478d..e7a80c2 100644
--- a/source/kit/secure_random.h
+++ b/source/kit/secure_random.h
@@ -2,6 +2,8 @@
 #define KIT_SECURE_RANDOM_H
 
 #include "status.h"
+
+#define _GNU_SOURCE
 #include <stddef.h>
 #include <stdint.h>
 
diff --git a/source/kit/thread.h b/source/kit/thread.h
index eff2684..e8fb7e8 100644
--- a/source/kit/thread.h
+++ b/source/kit/thread.h
@@ -3,8 +3,10 @@
 
 #ifndef KIT_DISABLE_SYSTEM_THREADS
 #  include "thread_defs.h"
-#  include "time.h"
+
+#  define _GNU_SOURCE
 #  include <stddef.h>
+#  include <time.h>
 
 #  if defined(__cplusplus)
 #    define _Noreturn [[noreturn]]
diff --git a/source/kit/time.c b/source/kit/time.c
deleted file mode 100644
index ccd3835..0000000
--- a/source/kit/time.c
+++ /dev/null
@@ -1,65 +0,0 @@
-#include "time.h"
-
-#ifdef KIT_NEED_TIMESPEC_GET
-
-#  if defined(_WIN32) && !defined(__CYGWIN__)
-
-#    ifndef WIN32_LEAN_AND_MEAN
-#      define WIN32_LEAN_AND_MEAN 1
-#    endif
-#    include <windows.h>
-
-int timespec_get(struct timespec *ts, int base) {
-/*  difference between 1970 and 1601 */
-#    define _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS 116444736000000000ull
-/*  1 tick is 100 nanoseconds */
-#    define _TIMESPEC_IMPL_TICKS_PER_SECONDS 10000000ull
-  if (ts == NULL)
-    return 0;
-  if (base == TIME_UTC) {
-    FILETIME       ft;
-    ULARGE_INTEGER date;
-    LONGLONG       ticks;
-
-    GetSystemTimeAsFileTime(&ft);
-    date.HighPart = ft.dwHighDateTime;
-    date.LowPart  = ft.dwLowDateTime;
-    ticks         = (LONGLONG) (date.QuadPart -
-                        _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS);
-    ts->tv_sec    = ticks / _TIMESPEC_IMPL_TICKS_PER_SECONDS;
-    ts->tv_nsec   = (ticks % _TIMESPEC_IMPL_TICKS_PER_SECONDS) * 100;
-    return base;
-  }
-  return 0;
-#    undef _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS
-#    undef _TIMESPEC_IMPL_TICKS_PER_SECONDS
-}
-
-#  elif defined(KIT_HAVE_CLOCK_GETTIME)
-int timespec_get(struct timespec *ts, int base) {
-  if (ts == NULL)
-    return 0;
-  if (base == TIME_UTC) {
-    clock_gettime(CLOCK_REALTIME, ts);
-    return base;
-  }
-  return 0;
-}
-#  else
-#    include <sys/time.h>
-
-int timespec_get(struct timespec *ts, int base) {
-  if (ts == NULL)
-    return 0;
-  if (base == TIME_UTC) {
-    struct timeval tv;
-    gettimeofday(&tv, NULL);
-    ts->tv_sec  = tv.tv_sec;
-    ts->tv_nsec = tv.tv_usec * 1000;
-    return base;
-  }
-  return 0;
-}
-#  endif
-
-#endif
diff --git a/source/kit/time.h b/source/kit/time.h
deleted file mode 100644
index cf54d47..0000000
--- a/source/kit/time.h
+++ /dev/null
@@ -1,33 +0,0 @@
-#ifndef KIT_TIME_H
-#define KIT_TIME_H
-
-#include <time.h>
-
-#ifndef TIME_UTC
-#  define TIME_UTC 1
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifdef KIT_NEED_STRUCT_TIMESPEC
-#  ifdef KIT_HAVE_BITS_TYPES_STRUCT_TIMESPEC_H
-#    include <bits/types/struct_timespec.h>
-#  else
-struct timespec {
-  time_t tv_sec;  /* Seconds      - >= 0 */
-  long   tv_nsec; /* Nanoseconds  - [0, 999999999] */
-};
-#  endif
-#endif
-
-#ifdef KIT_NEED_TIMESPEC_GET
-int timespec_get(struct timespec *ts, int base);
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
-- 
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