From 0630db62980ca20d43195e2861e6862a77ee3ddb Mon Sep 17 00:00:00 2001
From: Biedermann Steve <biedermann.steve@fronius.com>
Date: Thu, 18 Apr 2024 15:26:25 +0200
Subject: [PATCH] init

---
 .gitignore  |  1 +
 Cargo.lock  | 16 ++++++++++++++++
 Cargo.toml  |  9 +++++++++
 src/main.rs | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 81 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..715a067
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,16 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "asdf"
+version = "0.1.0"
+dependencies = [
+ "split_one",
+]
+
+[[package]]
+name = "split_one"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2198b215a5ce931043797f707249b3142fe544aca13cfbdf92bdaecccd7f214c"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..b133c5b
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "asdf"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+split_one = "1.0.2"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..2a1c6eb
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,55 @@
+use std::time::{SystemTime, UNIX_EPOCH};
+
+const NANOS_PER_SEC: u32 = 1_000_000_000;
+fn manual_duration_as_secs_f32(secs: u64, nanos: u128) -> f32 {
+    let secs_as_f32 = secs as f32;
+    println!("secs_as_f32: {secs_as_f32:.10}");
+    let nanos_as_f32 = nanos as f32;
+    println!("nanos_as_f32: {nanos_as_f32:.10}");
+    let nanos_per_sec_as_f32 = NANOS_PER_SEC as f32;
+    println!("nanos_per_sec_as_f32: {nanos_per_sec_as_f32:.10}");
+    let nanos_in_seconds = nanos_as_f32 / nanos_per_sec_as_f32;
+    println!("nanos_in_seconds: {nanos_in_seconds:.10}");
+    let result = secs_as_f32 + nanos_in_seconds;
+    println!("result: {result:.10}");
+    result
+}
+
+fn manual_duration_as_secs_f32_late_cast(secs: u64, nanos: u128) -> f32 {
+    let nanos_in_seconds = nanos / (NANOS_PER_SEC as u128);
+    println!("nanos_in_seconds: {nanos_in_seconds:.10}");
+    let result = (secs as u128) + nanos_in_seconds;
+    println!("result: {result:.10}");
+    result as f32
+}
+
+fn main() {
+    let original = 1713441059 as u128;
+    let original_as_f32 = 1713441059 as f32;
+    println!("original: {original}");
+    println!("original_as_f32: {original_as_f32}");
+    println!("original_as_f32 < f32::MAX: {}", original_as_f32 < f32::MAX);
+    println!(
+        "original_as_f32 as u128 == original: {}",
+        original_as_f32 as u128 == original
+    );
+
+    let now = SystemTime::now();
+    println!("SystemTime::now(): {now:?}");
+    let now = now.duration_since(UNIX_EPOCH).unwrap();
+    println!("now.duration_since(): {now:?}");
+    let secs = now.as_secs();
+    let nanos = now.as_nanos() - ((secs * (NANOS_PER_SEC as u64)) as u128);
+    println!("now.duration_since() internal: Secs: {secs}, Nanos: {nanos}");
+    let now_f32 = now.as_secs_f32();
+    println!("as secs f32: {now_f32:.0}");
+    let now_f64 = now.as_secs_f64();
+    println!("as secs f64: {now_f64:.0}");
+    println!("secs: {secs:.10}");
+    println!("nanos: {nanos:.10}");
+    println!("NANOS_PER_SEC: {NANOS_PER_SEC:.10}");
+    let manual_f32 = manual_duration_as_secs_f32(secs, nanos);
+    println!("manual as secs f32: {manual_f32:.0}");
+    let manual_f32_late_cast = manual_duration_as_secs_f32_late_cast(secs, nanos);
+    println!("manual as secs f32 (late cast): {manual_f32_late_cast:.0}");
+}