libc: Define EOVERFLOW and make every dummy errno value unique

libs/libc/include/errno.h

@@ -44,6 +44,7 @@ extern int errno;
 #define ENOTEMPTY 39    // Directory not empty. Not implemented.
 #define ELOOP 40        // Too many levels of symbolic links. Not implemented.
 #define ENOMSG 42       // No message of desired type. Not implemented.
+#define EOVERFLOW 75    // Value too large for defined data type. Not implemented.
 #define EILSEQ 84       // Invalid or incomplete multibyte or wide character. Not implemented.
 #define ENOTSOCK 88     // Socket operation on non-socket. Not implemented.
 #define ENOTSUP 95      // Operation not supported
@@ -57,23 +58,23 @@ extern int errno;
 
 // FIXME: Right now I don't want to have to order and label these, since we have no net support anyways.
 #define EADDRNOTAVAIL -1
-#define EAFNOSUPPORT -1
-#define ECONNABORTED -1
-#define ECONNREFUSED -1
-#define EDESTADDRREQ -1
-#define EHOSTUNREACH -1
-#define EINPROGRESS -1
-#define EMSGSIZE -1
-#define ENETDOWN -1
-#define ENETRESET -1
-#define ENETUNREACH -1
-#define ENOBUFS -1
-#define ENOMSG -1
-#define ENOPROTOOPT -1
-#define ENOTCONN -1
-#define ENOTSOCK -1
-#define EPROTONOSUPPORT -1
-#define EPROTOTYPE -1
+#define EAFNOSUPPORT -2
+#define ECONNABORTED -3
+#define ECONNREFUSED -4
+#define EDESTADDRREQ -5
+#define EHOSTUNREACH -6
+#define EINPROGRESS -7
+#define EMSGSIZE -8
+#define ENETDOWN -9
+#define ENETRESET -10
+#define ENETUNREACH -11
+#define ENOBUFS -12
+#define ENOMSG -13
+#define ENOPROTOOPT -14
+#define ENOTCONN -15
+#define ENOTSOCK -16
+#define EPROTONOSUPPORT -17
+#define EPROTOTYPE -18
 
 #ifdef _GNU_SOURCE // Give it only to programs that ask for it.
 /* Name used to invoke calling program. Same value as argv[0] in main(), but can be used globally. */