Portability improvements

* Add or fix support for building on Solaris, illumos,
  Linux/musl, NetBSD, OpenBSD, IBM AIX, and Haiku.
* Use pkg-config when available to determine CFLAGS and
  libraries.
* Cleanup excess trailing whitespace characters.
* Indent nested preprocessor directives with GNU Cppi.
* Tested build under Oracle Solaris, OpenIndiana illumos,
  Linux/musl, Linux/glibc, IBM AIX, Haiku, FreeBSD, OpenBSD,
  NetBSD, and Apple macOS.
* Compilation tested and working with PCC, GCC, Clang, IBM XL C,
  IBM Open XL C, Oracle Studio C, NVIDIA HPC SDK C, Portland
  Group C, and DMD ImportC.

Signed-off-by: Jeffrey H. Johnson <trnsz@pobox.com>

GNUmakefile

@@ -0,0 +1,62 @@
+# Makefile for the supdup server and client.
+
+SHELL = /bin/sh
+PREFIX ?= /usr/local
+OS_NAME ?= $(shell uname)
+
+CC ?= cc
+CFLAGS += $(shell pkg-config --cflags ncurses 2> /dev/null)
+NCURSES_LIBS ?= $(shell pkg-config --libs ncurses 2> /dev/null || printf '%s' "-lncurses")
+
+# AIX (needs linking libcurses *after* libncurses)
+ifeq ($(OS_NAME), AIX)
+ EXTRA_LDFLAGS = -lcurses
+endif
+
+# Mac OS X
+ifeq ($(OS_NAME), Darwin)
+ LDFLAGS += -L/opt/local/lib
+endif
+
+# Solaris and illumos
+ifeq ($(OS_NAME), SunOS)
+ CFLAGS += -I/usr/include/ncurses
+ EXTRA_LDFLAGS = -lnsl -lsocket
+endif
+
+# Haiku
+ifeq ($(OS_NAME), Haiku)
+ EXTRA_LDFLAGS = -lnetwork
+endif
+
+# NetBSD
+ifeq ($(OS_NAME), NetBSD)
+ CFLAGS += -I/usr/pkg/include -I/usr/pkg/include/ncurses
+ LDFLAGS += -L/usr/pkg/lib
+endif
+
+# The server (supdupd) isn't ready for prime time.
+all: supdup
+
+SUPDUP_OBJS = supdup.o charmap.o tcp.o chaos.o
+supdup: $(SUPDUP_OBJS)
+	$(CC) $(LDFLAGS) -o $@ $(SUPDUP_OBJS) $(NCURSES_LIBS) $(EXTRA_LDFLAGS)
+
+SUPDUPD_OBJS = supdupd.o
+supdupd: $(SUPDUPD_OBJS)
+	$(CC) $(LDFLAGS) -o $@ $(SUPDUPD_OBJS)
+
+install: supdup
+	install -m 0755 supdup $(PREFIX)/bin
+	test -x supdupd && install -m 0755 supdupd $(PREFIX)/bin
+
+clean:
+	rm -f *.o
+	rm -f supdup supdupd
+
+# Dependencies
+chaos.o: supdup.h
+charmap.o: charmap.h
+supdup.o: charmap.h
+supdupd.o: supdup.h
+tcp.o: supdup.h

chaos.c

@@ -4,33 +4,34 @@
 
 #if USE_CHAOS_STREAM_SOCKET
 
-#include <stdio.h>
-#include <netdb.h>
-#include <unistd.h>
-#include <string.h>
-#include <sys/un.h>
-#include <sys/errno.h>
+# include <stdio.h>
+# include <netdb.h>
+# include <unistd.h>
+# include <string.h>
+# include <sys/un.h>
+# include <errno.h>
+# include <sys/socket.h>
 
 // Where are the chaos sockets? Cf. https://github.com/bictorv/chaosnet-bridge
-#ifndef CHAOS_SOCKET_DIRECTORY
-#define CHAOS_SOCKET_DIRECTORY "/tmp"
-#endif
+# if !defined(CHAOS_SOCKET_DIRECTORY)
+#  define CHAOS_SOCKET_DIRECTORY "/tmp"
+# endif
 // What DNS domain should be used to translate Chaos addresses to names?
-#ifndef CHAOS_ADDRESS_DOMAIN
-#define CHAOS_ADDRESS_DOMAIN "ch-addr.net"
-#endif
+# if !defined(CHAOS_ADDRESS_DOMAIN)
+#  define CHAOS_ADDRESS_DOMAIN "ch-addr.net"
+# endif
 // What DNS server should be used to fetch Chaos class data?
-#ifndef CHAOS_DNS_SERVER
+# if !defined(CHAOS_DNS_SERVER)
 // #define CHAOS_DNS_SERVER "130.238.19.25"
-#define CHAOS_DNS_SERVER "dns.chaosnet.net"
-#endif
+#  define CHAOS_DNS_SERVER "dns.chaosnet.net"
+# endif
 
 static int
 connect_to_named_socket(int socktype, char *path)
 {
   int sock, slen;
   struct sockaddr_un server;
-  
+
   if ((sock = socket(AF_UNIX, socktype, 0)) < 0) {
     perror("socket(AF_UNIX)");
     return -1;
@@ -61,7 +62,7 @@ static ssize_t write_all(int fd, void *buf, size_t n)
       return m;
     x += m;
     n -= m;
-  }    
+  }
   return x - (char *)buf;
 }
 
@@ -77,12 +78,12 @@ static ssize_t read_all(int fd, void *buf, size_t n)
       return m;
     x += m;
     n -= m;
-  }    
+  }
   return x - (char *)buf;
 }
 
 static int
-connection(int net, const char *host, const char *contact) 
+connection(int net, const char *host, const char *contact)
 {
   char buf[1000]; /*Bill Gates says this ought to be enough.*/
   char *bp, cbuf[2];

charmap.h

@@ -1,5 +1,5 @@
-#ifndef CHARMAP_H
-#define CHARMAP_H
+#if !defined(CHARMAP_H)
+# define CHARMAP_H
 
 typedef struct {
     char *name;

supdup-login.c

@@ -34,12 +34,12 @@
 #include <errno.h>
 #include <syslog.h>
 
-#define	SCPYN(a, b)	strncpy(a, b, sizeof(a))
+#define SCPYN(a, b)	strncpy(a, b, sizeof(a))
 
 #define NMAX	sizeof(utmp.ut_name)
 
-#define	FALSE	0
-#define	TRUE	-1
+#define FALSE	0
+#define TRUE	-1
 
 char	QUOTAWARN[] =	"/usr/ucb/quota";	/* warn user about quotas */
 char	CANTRUN[] =	"login: Can't run ";
@@ -218,7 +218,7 @@ main(argc, argv)
 			namep = crypt(pp, pwd->pw_passwd);
 			setpriority(PRIO_PROCESS, 0, 0);
 /* loseit */
-#ifdef PARANOIA
+#if defined(PARANOIA)
 			/* If not secure check that password is long enough
 			   and don't allow no-password logins */
 			if (!ttysecure) {
@@ -638,7 +638,7 @@ getstr(buf, cnt, err)
 char	*speeds[] =
     { "0", "50", "75", "110", "134", "150", "200", "300",
       "600", "1200", "1800", "2400", "4800", "9600", "19200", "38400" };
-#define	NSPEEDS	(sizeof (speeds) / sizeof (speeds[0]))
+#define NSPEEDS	(sizeof (speeds) / sizeof (speeds[0]))
 
 doremoteterm(term, tp)
 	char *term;
@@ -658,19 +658,19 @@ doremoteterm(term, tp)
 	tp->sg_flags = ECHO|CRMOD|ANYP|XTABS;
 }
 
-#ifdef 0
+#if 0
 /* Use syslog instead */
 logerr(fmt, a1, a2, a3)
 	char *fmt, *a1, *a2, *a3;
 {
-#ifdef LOGERR
+# if defined(LOGERR)
 	FILE *cons = fopen("/dev/console", "w");
 
 	if (cons != NULL) {
 		fprintf(cons, fmt, a1, a2, a3);
 		fprintf(cons, "\n\r");
 		fclose(cons);
 	}
-#endif
+# endif
 }
 #endif /* 0 */