Add more build-info functions to c-api (#8216)

* Add more build-info functions to c-api

* Use CStr for COMPILER/COPYRIGHT/PLATFORM

crates/capi/src/pylifecycle.rs

@@ -4,7 +4,8 @@ use crate::pystate::ensure_thread_has_vm_attached;
 use alloc::ffi::CString;
 use core::ffi::{c_char, c_int, c_ulong};
 use rustpython_vm::common::rc::PyRc;
-use rustpython_vm::version::{MAJOR, MICRO, MINOR, VERSION_HEX};
+use rustpython_vm::stdlib::sys;
+use rustpython_vm::version::{MAJOR, MICRO, MINOR, RUSTPYTHON_BUILD_INFO, VERSION_HEX};
 use rustpython_vm::vm::thread::ThreadedVirtualMachine;
 use rustpython_vm::{Context, Interpreter};
 use std::sync::{LazyLock, Mutex};
@@ -80,6 +81,29 @@ pub extern "C" fn Py_GetVersion() -> *const c_char {
     VERSION.as_ptr()
 }
 
+#[unsafe(no_mangle)]
+pub extern "C" fn Py_GetBuildInfo() -> *const c_char {
+    static BUILD_INFO: LazyLock<CString> = LazyLock::new(|| {
+        CString::new(RUSTPYTHON_BUILD_INFO).expect("build info must not contain interior NULs")
+    });
+    BUILD_INFO.as_ptr()
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn Py_GetCompiler() -> *const c_char {
+    c"[RUST]".as_ptr()
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn Py_GetCopyright() -> *const c_char {
+    sys::COPYRIGHT.as_ptr()
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn Py_GetPlatform() -> *const c_char {
+    sys::PLATFORM.as_ptr()
+}
+
 #[cfg(test)]
 mod tests {
     use pyo3::prelude::*;

crates/vm/src/builtins/str.rs

@@ -34,6 +34,7 @@ use crate::{
 use alloc::{borrow::Cow, fmt};
 use ascii::{AsciiChar, AsciiStr, AsciiString};
 use bstr::ByteSlice;
+use core::ffi::CStr;
 use core::{char, mem, ops::Range};
 use itertools::Itertools;
 use num_traits::ToPrimitive;
@@ -1700,6 +1701,13 @@ impl ToPyObject for &String {
     }
 }
 
+impl ToPyObject for &CStr {
+    fn to_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
+        let s = self.to_str().expect("ToPyObject expects utf-8 CStr");
+        vm.ctx.new_str(s).into()
+    }
+}
+
 impl ToPyObject for &Wtf8 {
     fn to_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
         vm.ctx.new_str(self).into()

crates/vm/src/stdlib/sys.rs

@@ -4,6 +4,7 @@ use crate::{Py, PyPayload, PyResult, VirtualMachine, builtins::PyModule, convert
 
 #[cfg(all(not(feature = "host_env"), feature = "stdio"))]
 pub(crate) use sys::SandboxStdio;
+pub use sys::{COPYRIGHT, PLATFORM};
 pub(crate) use sys::{DOC, MAXSIZE, RUST_MULTIARCH, UnraisableHookArgsData, module_def, multiarch};
 
 #[pymodule(name = "_jit")]
@@ -50,6 +51,7 @@ pub mod sys {
         version,
         vm::{Settings, VirtualMachine},
     };
+    use core::ffi::CStr;
     use core::sync::atomic::Ordering;
     use num_traits::ToPrimitive;
     use std::{
@@ -222,7 +224,7 @@ pub mod sys {
     #[pyattr(name = "api_version")]
     const API_VERSION: u32 = 0x0; // what C api?
     #[pyattr(name = "copyright")]
-    const COPYRIGHT: &str = "Copyright (c) 2019 RustPython Team";
+    pub const COPYRIGHT: &CStr = c"Copyright (c) 2019 RustPython Team";
     #[pyattr(name = "float_repr_style")]
     const FLOAT_REPR_STYLE: &str = "short";
     #[pyattr(name = "_framework")]
@@ -235,14 +237,14 @@ pub mod sys {
     const MAXUNICODE: u32 = core::char::MAX as u32;
 
     #[pyattr(name = "platform")]
-    pub const PLATFORM: &str = cfg_select! {
-        target_os = "linux" => "linux",
-        target_os = "android" => "android",
-        target_os = "macos" => "darwin",
-        target_os = "ios" => "ios",
-        windows => "win32",
-        target_os = "wasi" => "wasi",
-        _ => "unknown"
+    pub const PLATFORM: &CStr = cfg_select! {
+        target_os = "linux" => c"linux",
+        target_os = "android" => c"android",
+        target_os = "macos" => c"darwin",
+        target_os = "ios" => c"ios",
+        windows => c"win32",
+        target_os = "wasi" => c"wasi",
+        _ => c"unknown"
     };
 
     #[pyattr(name = "ps1")]
@@ -1897,7 +1899,7 @@ pub(crate) fn sysconfigdata_name() -> String {
     format!(
         "_sysconfigdata_{}_{}_{}",
         sys::ABIFLAGS,
-        sys::PLATFORM,
+        sys::PLATFORM.to_string_lossy(),
         sys::multiarch()
     )
 }