1 files changed, 28 insertions, 0 deletions
diff --git a/openssl/src/lib.rs b/openssl/src/lib.rs
index 62968742..39c9fffe 100644
--- a/openssl/src/lib.rs
+++ b/openssl/src/lib.rs
@@ -16,6 +16,10 @@ extern crate tempdir;
 #[doc(inline)]
 pub use ffi::init;
 
+use libc::c_int;
+
+use error::ErrorStack;
+
 mod macros;
 
 pub mod asn1;
@@ -28,3 +32,27 @@ pub mod nid;
 pub mod ssl;
 pub mod version;
 pub mod x509;
+
+pub fn cvt_p<T>(r: *mut T) -> Result<*mut T, ErrorStack> {
+    if r.is_null() {
+        Err(ErrorStack::get())
+    } else {
+        Ok(r)
+    }
+}
+
+pub fn cvt(r: c_int) -> Result<c_int, ErrorStack> {
+    if r <= 0 {
+        Err(ErrorStack::get())
+    } else {
+        Ok(r)
+    }
+}
+
+pub fn cvt_n(r: c_int) -> Result<c_int, ErrorStack> {
+    if r < 0 {
+        Err(ErrorStack::get())
+    } else {
+        Ok(r)
+    }
+}