disambiguate include guards and export C strings

src/header/sys_utsname/cbindgen.toml

@@ -1,7 +1,7 @@
 # POSIX header spec: https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_utsname.h.html
 #
 # There are no spec quotations relating to includes
-include_guard = "_SYS_UTSNAME_H"
+include_guard = "_RELIBC_SYS_UTSNAME_H"
 language = "C"
 style = "Tag"
 no_includes = true

src/header/tar/cbindgen.toml

@@ -1,7 +1,13 @@
 # POSIX header spec: https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/tar.h.html
 #
 # There are no spec quotations relating to includes
-include_guard = "_TAR_H"
+include_guard = "_RELIBC_TAR_H"
+# cbindgen cannot export Rust &str
+after_includes = """
+
+#define TMAGIC "ustar"
+#define TVERSION "00"
+"""
 language = "C"
 style = "Tag"
 no_includes = true

src/header/tar/mod.rs

@@ -54,8 +54,10 @@ pub const FIFOTYPE: u8 = b'6'; // FIFO special
 pub const CONTTYPE: u8 = b'7'; // Contiguous file
 
 /// tar format magic and version
+/// cbindgen:ignore
 pub const TMAGIC: &str = "ustar"; // Magic string : ustar and a null
 pub const TMAGLEN: usize = 6; // Length of the magic string
+/// cbindgen:ignore
 pub const TVERSION: &str = "00"; // Version string
 pub const TVERSLEN: usize = 2; // Length of the version string