From b1cf9e5dfbc8967bd7cb2a22ec1e5e521f4e0e6e Mon Sep 17 00:00:00 2001
From: Benji Dial <benji@benjidial.net>
Date: Wed, 31 Jul 2024 13:36:53 -0400
Subject: add clock

---
 euler/include/ctime             | 20 ++++++++++++++
 euler/include/euler/syscall.hpp |  5 ++++
 euler/include/std/string.hpp    | 10 +++++++
 euler/makefile                  |  2 +-
 euler/source/std/ctime.cpp      | 58 +++++++++++++++++++++++++++++++++++++++++
 euler/source/syscall.cpp        | 23 ++++++++++++++++
 6 files changed, 117 insertions(+), 1 deletion(-)
 create mode 100644 euler/include/ctime
 create mode 100644 euler/source/std/ctime.cpp

(limited to 'euler')

diff --git a/euler/include/ctime b/euler/include/ctime
new file mode 100644
index 0000000..9cf1b1f
--- /dev/null
+++ b/euler/include/ctime
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <cstdint>
+
+typedef uint64_t time_t;
+
+struct tm {
+  int tm_sec;
+  int tm_min;
+  int tm_hour;
+  int tm_mday;
+  int tm_mon;
+  int tm_year;
+  int tm_wday;
+  int tm_yday;
+  int tm_isdst;
+};
+
+time_t time(time_t *arg);
+tm *gmtime(const time_t *time);
diff --git a/euler/include/euler/syscall.hpp b/euler/include/euler/syscall.hpp
index 4a3daa4..043dcd4 100644
--- a/euler/include/euler/syscall.hpp
+++ b/euler/include/euler/syscall.hpp
@@ -159,6 +159,11 @@ namespace euler::syscall {
 
   void set_thread_name(const std::string &name);
 
+  void sleep(uint64_t mibiseconds);
+
+  //out is mibiseconds since january 1st 2000
+  uint64_t get_time();
+
 }
 
 #include <string>
diff --git a/euler/include/std/string.hpp b/euler/include/std/string.hpp
index 505ee69..c5a3d99 100644
--- a/euler/include/std/string.hpp
+++ b/euler/include/std/string.hpp
@@ -12,6 +12,8 @@ namespace std {
     std::vector<char> characters;
 
   public:
+    static const size_t npos = (size_t)-1;
+
     constexpr string() : characters({'\0'}) {}
 
     constexpr string(const string &other)
@@ -74,6 +76,14 @@ namespace std {
       return characters[pos];
     }
 
+    constexpr string &erase(size_t index = 0, size_t count = npos) {
+      count = std::min(count, size() - index);
+      for (size_t i = index; i + count < size(); ++i)
+        characters[i] = characters[i + count];
+      resize(size() - count);
+      return *this;
+    }
+
   };
 
 }
diff --git a/euler/makefile b/euler/makefile
index 62716f6..7574dea 100644
--- a/euler/makefile
+++ b/euler/makefile
@@ -1,6 +1,6 @@
 LIBC_SOURCES = \
   entry.cpp std/string.cpp std/cstring.cpp syscall.cpp std/cstdlib.cpp \
-  heap.cpp syscall.asm std/cctype.cpp std/cstdio.cpp stream.cpp
+  heap.cpp syscall.asm std/cctype.cpp std/cstdio.cpp stream.cpp std/ctime.cpp
 
 clean:
 	rm -rf build
diff --git a/euler/source/std/ctime.cpp b/euler/source/std/ctime.cpp
new file mode 100644
index 0000000..d83817a
--- /dev/null
+++ b/euler/source/std/ctime.cpp
@@ -0,0 +1,58 @@
+#include <euler/syscall.hpp>
+#include <ctime>
+
+time_t time(time_t *arg) {
+  time_t t = euler::syscall::get_time();
+  if (arg) *arg = t;
+  return t;
+}
+
+static tm static_tm;
+
+static int days_per_month[] = {
+  31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,
+  31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,
+  31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,
+  31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+tm *gmtime(const time_t *time) {
+
+  time_t t = *time / 1024;
+
+  static_tm.tm_isdst = 0;
+
+  static_tm.tm_sec  = t % 60; t /= 60;
+  static_tm.tm_min  = t % 60; t /= 60;
+  static_tm.tm_hour = t % 24; t /= 24;
+  static_tm.tm_wday = (t + 5) % 7 + 1;
+  static_tm.tm_year = (t / 1461) * 4 + 100;
+
+  int days_into_quadyear = t % 1461;
+
+  static_tm.tm_yday = 0;
+  static_tm.tm_mon = 0;
+  static_tm.tm_mday = 1;
+
+  for (int i = 0; i < 48; ++i) {
+    if (days_into_quadyear >= days_per_month[i]) {
+      days_into_quadyear -= days_per_month[i];
+      if (static_tm.tm_mon == 11) {
+        static_tm.tm_mon = 0;
+        static_tm.tm_yday = 0;
+      }
+      else {
+        ++static_tm.tm_mon;
+        static_tm.tm_yday += days_per_month[i];
+      }
+    }
+    else {
+      static_tm.tm_yday += days_into_quadyear;
+      static_tm.tm_mday += days_into_quadyear;
+      break;
+    }
+  }
+
+  return &static_tm;
+
+}
diff --git a/euler/source/syscall.cpp b/euler/source/syscall.cpp
index 0d30c4a..7637b10 100644
--- a/euler/source/syscall.cpp
+++ b/euler/source/syscall.cpp
@@ -407,4 +407,27 @@ namespace euler::syscall {
 
   }
 
+  void sleep(uint64_t mibiseconds) {
+
+    uint64_t rax = 25;
+    uint64_t rdi = mibiseconds;
+    uint64_t rsi;
+    uint64_t rdx;
+
+    __euler_do_syscall(rax, rdi, rsi, rdx);
+
+  }
+
+  uint64_t get_time() {
+
+    uint64_t rax = 26;
+    uint64_t rdi;
+    uint64_t rsi;
+    uint64_t rdx;
+
+    __euler_do_syscall(rax, rdi, rsi, rdx);
+    return rax;
+
+  }
+
 }
-- 
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