Add mes and mescc-tools-extra

mescc-tools-extra contains two important tools:
- cp
- chmod

mes first builds itself from a mes 0.21 seed as used by guix, and then
builds a mes 0.22 and then mes 0.22 using that created mes 0.22.

It does /not/ use bootstrap.sh as we don't have a proper shell at this
point, it has been manually adapted for kaem.

sysa/mes-0.22/lib/tests/posix/50-getenv.c

@@ -0,0 +1,31 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "mes/lib.h"
+#include "stdlib.h"
+
+int
+main (int argc, char const *argv[])
+{
+  eputs ("test:getenv\n");
+  if (getenv ("PATH") == 0)
+    return 1;
+  return 0;
+}

sysa/mes-0.22/lib/tests/posix/50-open-read.c

@@ -0,0 +1,57 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <mes/lib.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int
+main (int argc, char const *argv[])
+{
+  eputs ("test:getenv\n");
+  char file_name[PATH_MAX];
+  char *srcdir = getenv ("abs_top_srcdir");
+  if (! srcdir) // for running by hand
+    srcdir = ".";
+  eputs ("srcdir=");
+  eputs (srcdir);
+  eputs ("\n");
+  strcpy (file_name, srcdir);
+  strcpy (file_name + strlen (srcdir), "/lib/tests/posix/data/open-read");
+  eputs ("test open:");
+  eputs (file_name);
+  eputs ("\n");
+  int filedes = open (file_name, O_RDONLY, 0);
+  if (filedes <= 2)
+    return 1;
+  char buf[20];
+  int n = read (filedes, buf, sizeof (buf));
+  if (n != 5)
+    return 2;
+  if (strcmp (buf, "hello"))
+    return 3;
+  eputs ("test read: ");
+  eputs (buf);
+  eputs ("\n");
+  return 0;
+}

sysa/mes-0.22/lib/tests/posix/90-execlp.c

@@ -0,0 +1,28 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "unistd.h"
+
+int
+main (int argc, char const *argv[])
+{
+  execlp ("echo", "echo", "Hello", "World!", 0);
+  return 0;
+}

sysa/mes-0.22/lib/tests/posix/90-execlp.stdout

@@ -0,0 +1 @@
+Hello World!

sysa/mes-0.22/lib/tests/posix/90-unsetenv.c

@@ -0,0 +1,41 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <mes/lib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+int
+main ()
+{
+  eputs ("setenv\n");
+  setenv ("FOO", "BAR", 1);
+  if (strcmp (getenv ("FOO"), "BAR"))
+    return 1;
+  eputs ("unsetenv\n");
+  unsetenv ("FOO");
+  if (getenv ("FOO"))
+    return 2;
+
+  return 0;
+}

sysa/mes-0.22/lib/tests/posix/data/open-read

@@ -0,0 +1 @@
+hello