From 12dedc7e2e51390fdf2caec3700e75db19be1cd4 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Tue, 28 Oct 2025 18:31:39 +0100
Subject: kstd: don't rely on newlib

---
 libs/kstd/CMakeLists.txt           |  8 ++++++++
 libs/kstd/include/kstd/bits/os.hpp |  2 ++
 libs/kstd/src/bits/os.cpp          | 10 ++++++++++
 libs/kstd/src/cstdlib.cpp          | 18 ++++++++++++++++++
 libs/kstd/src/cstring.cpp          | 10 ++++++++++
 5 files changed, 48 insertions(+)
 create mode 100644 libs/kstd/src/bits/os.cpp
 create mode 100644 libs/kstd/src/cstdlib.cpp
 create mode 100644 libs/kstd/src/cstring.cpp

(limited to 'libs')

diff --git a/libs/kstd/CMakeLists.txt b/libs/kstd/CMakeLists.txt
index ac9e78f..666a5d7 100644
--- a/libs/kstd/CMakeLists.txt
+++ b/libs/kstd/CMakeLists.txt
@@ -2,6 +2,9 @@ add_library("kstd" STATIC)
 add_library("libs::kstd" ALIAS "kstd")
 
 target_sources("kstd" PRIVATE
+    "src/bits/os.cpp"
+    "src/cstdlib.cpp"
+    "src/cstring.cpp"
     "src/mutex.cpp"
 )
 
@@ -23,3 +26,8 @@ target_sources("kstd" PUBLIC
 target_include_directories("kstd" PUBLIC
     "include"
 )
+
+target_link_options("kstd" INTERFACE
+    "-Wl,--undefined=abort"
+    "-Wl,--undefined=strlen"
+)
\ No newline at end of file
diff --git a/libs/kstd/include/kstd/bits/os.hpp b/libs/kstd/include/kstd/bits/os.hpp
index 0425b88..7f5fcc8 100644
--- a/libs/kstd/include/kstd/bits/os.hpp
+++ b/libs/kstd/include/kstd/bits/os.hpp
@@ -6,6 +6,8 @@
 
 namespace kstd::os
 {
+  auto abort() -> bool;
+
   [[noreturn]]
   auto panic(std::string_view message, std::source_location = std::source_location::current()) -> void;
 }
diff --git a/libs/kstd/src/bits/os.cpp b/libs/kstd/src/bits/os.cpp
new file mode 100644
index 0000000..fb64202
--- /dev/null
+++ b/libs/kstd/src/bits/os.cpp
@@ -0,0 +1,10 @@
+#include "kstd/bits/os.hpp"
+
+namespace kstd::os
+{
+  [[gnu::weak]]
+  auto abort() -> bool
+  {
+    return false;
+  }
+}  // namespace kstd::os
\ No newline at end of file
diff --git a/libs/kstd/src/cstdlib.cpp b/libs/kstd/src/cstdlib.cpp
new file mode 100644
index 0000000..8fb5f63
--- /dev/null
+++ b/libs/kstd/src/cstdlib.cpp
@@ -0,0 +1,18 @@
+#include "kstd/bits/os.hpp"
+
+namespace kstd
+{
+
+  extern "C"
+  {
+    [[noreturn]] auto abort() -> void
+    {
+      if (!kstd::os::abort())
+      {
+        os::panic("System abort handler returned.");
+      }
+      __builtin_trap();
+    }
+  }
+
+}  // namespace kstd
\ No newline at end of file
diff --git a/libs/kstd/src/cstring.cpp b/libs/kstd/src/cstring.cpp
new file mode 100644
index 0000000..5419b7d
--- /dev/null
+++ b/libs/kstd/src/cstring.cpp
@@ -0,0 +1,10 @@
+#include <algorithm>
+#include <cstddef>
+
+extern "C"
+{
+  auto strlen(const char * string) -> std::size_t
+  {
+    return std::distance(string, std::ranges::find(string, nullptr, '\0'));
+  }
+}
-- 
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