Added a c_char implementation

Author: elichai

src/types.rs

@@ -4,6 +4,45 @@ use core::fmt;
 pub type c_int = i32;
 pub type c_uchar = u8;
 pub type c_uint = u32;
+
+/// This is an exact copy of https://doc.rust-lang.org/src/std/os/raw/mod.rs.html
+/// `c_char` might be either signed or unsigned, defined by the platform,
+/// This should match the right type using conditional compilations from stdlib.
+#[cfg(any(all(target_os = "linux", any(target_arch = "aarch64",
+                                       target_arch = "arm",
+                                       target_arch = "powerpc",
+                                       target_arch = "powerpc64",
+                                       target_arch = "s390x")),
+          all(target_os = "android", any(target_arch = "aarch64",
+                                         target_arch = "arm")),
+          all(target_os = "l4re", target_arch = "x86_64"),
+          all(target_os = "freebsd", any(target_arch = "aarch64",
+                                         target_arch = "arm",
+                                         target_arch = "powerpc",
+                                         target_arch = "powerpc64")),
+          all(target_os = "netbsd", any(target_arch = "aarch64",
+                                        target_arch = "arm",
+                                        target_arch = "powerpc")),
+          all(target_os = "openbsd", target_arch = "aarch64"),
+          all(target_os = "fuchsia", target_arch = "aarch64")))]
+pub type c_char = u8;
+#[cfg(not(any(all(target_os = "linux", any(target_arch = "aarch64",
+                                           target_arch = "arm",
+                                           target_arch = "powerpc",
+                                           target_arch = "powerpc64",
+                                           target_arch = "s390x")),
+              all(target_os = "android", any(target_arch = "aarch64",
+                                             target_arch = "arm")),
+              all(target_os = "l4re", target_arch = "x86_64"),
+              all(target_os = "freebsd", any(target_arch = "aarch64",
+                                             target_arch = "arm",
+                                             target_arch = "powerpc",
+                                             target_arch = "powerpc64")),
+              all(target_os = "netbsd", any(target_arch = "aarch64",
+                                            target_arch = "arm",
+                                            target_arch = "powerpc")),
+              all(target_os = "openbsd", target_arch = "aarch64"),
+              all(target_os = "fuchsia", target_arch = "aarch64"))))]
 pub type c_char = i8;
 
 /// This is an exact copy of https://doc.rust-lang.org/core/ffi/enum.c_void.html