1 files changed, 25 insertions, 0 deletions
diff --git a/src/util.rs b/src/util.rs
new file mode 100644
index 0000000..8bcc028
--- /dev/null
+++ b/src/util.rs
@@ -0,0 +1,25 @@
+use std::ffi::{self, CStr};
+use std::ptr;
+use libc;
+
+/// Consumes and frees the input pointer, and assumes it points to
+/// a nul-terminated C-string that contains valid UTF8.
+pub unsafe fn string_from_utf8_charp(p: *mut i8) -> String {
+    let bytes = CStr::from_ptr(p).to_bytes();
+    let res = String::from_utf8(bytes.to_vec()).unwrap();
+    libc::free(p as *mut ffi::c_void);
+    res
+}
+
+pub fn strdup(s: &str) -> *mut i8 {
+    unsafe {
+        let p: *mut i8 = malloc(s.len() + 1);
+        ptr::copy_nonoverlapping(s.as_ptr(), p as *mut u8, s.len());
+        *p.add(s.len()) = 0;
+        p
+    }
+}
+
+pub unsafe fn malloc<T>(count: usize) -> *mut T {
+    libc::malloc(count * std::mem::size_of::<T>()) as *mut T
+}