Say "invalid" instead of "illegal".

There's nothing illegal about using an invalid lseek offset, an
invalid character encoding.

Author: sunfishcode

c-scape/src/error_str.rs

@@ -31,7 +31,7 @@ pub(crate) const fn error_str(e: Errno) -> Option<&'static str> {
         Errno::FBIG => "File too large",
         Errno::HOSTUNREACH => "Host is unreachable",
         Errno::IDRM => "Identifier removed",
-        Errno::ILSEQ => "Illegal byte sequence",
+        Errno::ILSEQ => "Invalid byte sequence",
         Errno::INPROGRESS => "Operation in progress",
         Errno::INTR => "Interrupted function",
         Errno::INVAL => "Invalid argument",
@@ -92,10 +92,7 @@ pub(crate) const fn error_str(e: Errno) -> Option<&'static str> {
         Errno::PROTOTYPE => "Protocol wrong type for socket",
         Errno::RANGE => "Result too large",
         Errno::ROFS => "Read-only file system",
-        #[cfg(target_env = "musl")]
         Errno::SPIPE => "Invalid seek",
-        #[cfg(not(target_env = "musl"))]
-        Errno::SPIPE => "Illegal seek",
         Errno::SRCH => "No such process",
         Errno::STALE => "Reserved",
         #[cfg(not(target_os = "wasi"))]

c-scape/src/signal/mod.rs

@@ -421,7 +421,7 @@ unsafe extern "C" fn strsignal(sig: c_int) -> *mut c_char {
         Signal::Cont => cstr!("Continue executing, if stopped").as_ptr() as _,
         Signal::Fpe => cstr!("Erroneous arithmetic operation").as_ptr() as _,
         Signal::Hup => cstr!("Hangup").as_ptr() as _,
-        Signal::Ill => cstr!("Illegal instruction").as_ptr() as _,
+        Signal::Ill => cstr!("Invalid instruction").as_ptr() as _,
         Signal::Int => cstr!("Terminal interrupt signal").as_ptr() as _,
         Signal::Kill => cstr!("Kill (cannot be caught or ignored)").as_ptr() as _,
         Signal::Pipe => cstr!("Write on a pipe with no one to read it").as_ptr() as _,