Use raw c_char to avoid issue on other archs

rust/suseconnect-agama/src/lib.rs

@@ -1,14 +1,15 @@
 use std::{
     ffi::{CString, IntoStringError},
     fmt::Display,
+    os::raw::c_char,
 };
 
 use serde_json::{json, Value};
 
 // Safety requirements: inherited from https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_ptr
 // expects that rust gets control of string pointer
 // note: it is different than libzypp bindings where string is still owned by libzypp
-pub(crate) unsafe fn string_from_ptr(c_ptr: *mut i8) -> Result<String, IntoStringError> {
+pub(crate) unsafe fn string_from_ptr(c_ptr: *mut c_char) -> Result<String, IntoStringError> {
     let c_str = CString::from_raw(c_ptr);
     c_str.into_string()
 }

rust/zypp-agama/src/helpers.rs

@@ -1,7 +1,7 @@
-use std::os::raw::c_void;
+use std::os::raw::{c_char, c_void};
 
 // Safety requirements: inherited from https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_ptr
-pub(crate) unsafe fn string_from_ptr(c_ptr: *const i8) -> String {
+pub(crate) unsafe fn string_from_ptr(c_ptr: *const c_char) -> String {
     String::from_utf8_lossy(std::ffi::CStr::from_ptr(c_ptr).to_bytes()).into_owned()
 }
 

rust/zypp-agama/src/lib.rs

@@ -265,7 +265,7 @@ impl Zypp {
                 .iter()
                 .map(|s| CString::new(*s).expect("CString must not contain internal NUL"))
                 .collect();
-            let c_ptr_names: Vec<*const i8> =
+            let c_ptr_names: Vec<*const c_char> =
                 c_names.iter().map(|c| c.as_c_str().as_ptr()).collect();
             let pattern_names = PatternNames {
                 size: names.len() as u32,