Added a whole bunch of .h files describing the module structure of the C

files. These files mostly mediate between the C source (export) and
the corresponding C stub files (import) generated by the Scheme files
calling the C routines.

This provided much better argument type checking that before; lots of
small bugs were caught.

Also added const keywords wherever I could find a reasonable place
to improve error detection and efficiency.

Tuned up the makefile to reflect all of this structure. It's dependencies
were pretty out-of-date as it was. It could probably use further work.

Makefile.in

@@ -108,14 +108,13 @@ SCSHOBJS = \
 	scsh/machine/time_dep1.o \
 	scsh/network.o scsh/network1.o \
 	scsh/putenv.o \
-	scsh/re.o \
+	scsh/rdelim.o \
-	scsh/rescm.o \
+	scsh/re.o scsh/re1.o \
+	scsh/regexp/libregexp.a \
 	scsh/syscalls.o scsh/syscalls1.o \
 	scsh/time.o scsh/time1.o \
 	scsh/tty.o scsh/tty1.o \
-	scsh/userinfo.o \
+	scsh/userinfo1.o \
-	scsh/regexp/libregexp.a \
-	scsh/rdelim.o \
 	scsh/select.o scsh/select1.o
 
 #    	scsh/$(DBOPEN) \
@@ -136,6 +135,7 @@ CONFIG_FILES = interfaces.scm low-packages.scm rts-packages.scm \
 enough: $(VM) $(IMAGE) script $(LIBCIG) scsh $(MANPAGE) .notify
 
 # The developers are curious to know.  Don't be concerned if this fails.
+# You may comment these lines out if you wish to be discourteous.
 .notify: minor-version-number
 	touch .notify
 	-echo SCSH 0.`cat $(srcdir)/scsh/minor-version-number` \
@@ -149,6 +149,25 @@ enough: $(VM) $(IMAGE) script $(LIBCIG) scsh $(MANPAGE) .notify
 .scm.c:
 	$(srcdir)/$(VM) -o $(srcdir)/$(VM) -i $(CIG) < $< > $*.c
 
+# These .h files mediate between the code exported from foo1.c
+# and imported into foo.scm's stub foo.c.
+
+scsh/dirstuff1.o: scsh/dirstuff1.h
+scsh/rdelim.o:    scsh/fdports1.h
+scsh/userinfo1.o: scsh/userinfo1.h
+
+scsh/fdports1.o	  scsh/fdports.o:  scsh/fdports1.h
+scsh/flock1.o	  scsh/flock.o:	   scsh/flock1.h
+scsh/network1.o	  scsh/network.o:  scsh/network1.h
+scsh/re1.o	  scsh/re.o:	   scsh/re1.h
+scsh/select1.o	  scsh/select.o:   scsh/select1.h
+scsh/syscalls1.o  scsh/syscalls.o: scsh/syscalls1.h
+scsh/time1.o	  scsh/time.o:	   scsh/time1.h
+scsh/tty1.o       scsh/tty.o:	   scsh/tty1.h
+
+scsh/syscalls.o:  scsh/syscalls1.h scsh/dirstuff1.h scsh/fdports1.h \
+		  scsh/select1.h   scsh/userinfo1.h
+
 include $(srcdir)/scsh/machine/Makefile.inc
 #NetBSD make wants to see this instead: (or use GNU make on BSD. -bri)
 #.include "$(srcdir)/scsh/machine/Makefile.inc"
@@ -511,14 +530,19 @@ $(CIG).image: $(IMAGE) $(VM) $(srcdir)/cig/cig.scm $(srcdir)/cig/libcig.scm
 #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 scsh: cig scsh/scsh scsh/scsh.image
 
-SCHEME =scsh/defrec.scm \
+SCHEME =scsh/awk.scm \
+	scsh/char-set.scm \
+	scsh/defrec.scm \
+	scsh/enumconst.scm \
 	scsh/fdports.scm \
 	scsh/fileinfo.scm \
 	scsh/filemtch.scm \
 	scsh/filesys.scm \
 	scsh/flock.scm \
 	scsh/fname.scm \
+	scsh/fr.scm \
 	scsh/glob.scm \
+	scsh/here.scm \
 	scsh/machine/bufpol.scm \
 	scsh/machine/errno.scm \
 	scsh/machine/fdflags.scm \
@@ -528,16 +552,21 @@ SCHEME =scsh/defrec.scm \
 	scsh/machine/time_dep.scm \
 	scsh/machine/tty-consts.scm \
 	scsh/machine/waitcodes.scm \
+	meta-arg.scm \
 	scsh/network.scm \
 	scsh/newports.scm \
 	scsh/procobj.scm \
+	scsh/rdelim.scm \
 	scsh/re.scm \
 	scsh/rw.scm \
 	scsh/scsh-condition.scm \
 	scsh/scsh-interfaces.scm \
 	scsh/scsh-package.scm \
+	scsh/scsh-read.scm \
+	scsh/scsh-version.scm \
 	scsh/scsh.scm \
 	scsh/select.scm \
+	scsh/startup.scm \
 	scsh/stringcoll.scm \
 	scsh/syntax-helpers.scm \
 	scsh/syntax.scm \
@@ -547,7 +576,9 @@ SCHEME =scsh/defrec.scm \
 	scsh/tty.scm \
 	scsh/utilities.scm
 
-#    	scsh/dbm.scm
+#    	scsh/dbm.scm db.scm ndbm.scm
+#	static.scm static-heap.scm static1.scm
+#	jcontrol
 
 # Bogus, but it makes the scm->c->o two-ply dependency work.
 # Explicitly giving the .o/.c dependency also makes it go.