Fix lots of compiler warnings that indicated some real problems
on modern 64 bit systems.
--- a/crc/makecrc.c
+++ b/crc/makecrc.c
@@ -31,13 +31,13 @@
 /* ZIP used by COMPACTOR						*/
 
 #include <stdio.h>
-
-extern void exit();
-extern char *strcat();
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
 
 static void initcrctab();
 
-main()
+int main(int argc, char *argv[])
 {
     initcrctab("ccitt", 0x1021, 0xffff, 0, 16);
     initcrctab("kermit", 0x8408, 0, 1, 16);
--- a/fileio/rdfile.c
+++ b/fileio/rdfile.c
@@ -42,18 +42,15 @@
 #define RSRC_FORMAT	2
 #define UNIX_FORMAT	3
 
-extern char *malloc();
-extern char *realloc();
-extern char *strcpy();
-extern char *strncpy();
-extern char *strcat();
-extern void exit();
-
-static void check_files();
-static void read_file();
-static void enter_dir();
-static void exit_dir();
-static int get_stdin_file();
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static void check_files(int);
+static void read_file(void);
+static void enter_dir(void);
+static void exit_dir(void);
+static int get_stdin_file(void);
 
 char file_info[INFOBYTES];
 char *data_fork, *rsrc_fork;
@@ -987,9 +984,9 @@
     no_recurse = 1;
 }
 
-char *get_rdfileopt()
+const char *get_rdfileopt()
 {
-    static char options[] = "rduUc:t:";
+    static const char options[] = "rduUc:t:";
 
     return options;
 }
--- a/fileio/wrfile.c
+++ b/fileio/wrfile.c
@@ -35,16 +35,9 @@
 #define MACI 9
 #endif /* SCAN */
 
-extern char *malloc();
-extern char *realloc();
-extern char *strcpy();
-extern char *strncpy();
-extern char *strcat();
-extern void exit();
-
-#ifdef UNDEF /* Do not declare sprintf; not portable (but lint will complain) */
-char *sprintf();
-#endif /* UNDEF */
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
 
 #ifdef AUFS
 static void check_aufs();
@@ -802,12 +795,12 @@
 #endif /* APPLESHARE */
 }
 
-void set_wrfileopt(restricted)
+void set_wrfileopt(int restricted)
 {
     mode_restricted = restricted;
 }
 
-void set_s_wrfileopt(restricted)
+void set_s_wrfileopt(int restricted)
 {
     mode_s_restricted = restricted;
 }
--- a/fileio/wrfileopt.h
+++ b/fileio/wrfileopt.h
@@ -1,6 +1,6 @@
-extern int wrfileopt();
-extern void give_wrfileopt();
-extern void set_wrfileopt();
-extern void set_s_wrfileopt();
-extern char *get_wrfileopt();
+extern int wrfileopt(char);
+extern void give_wrfileopt(void);
+extern void set_wrfileopt(int);
+extern void set_s_wrfileopt(int);
+extern char *get_wrfileopt(void);
 
--- a/hexbin/hexbin.c
+++ b/hexbin/hexbin.c
@@ -17,8 +17,10 @@
 
 #define LOCALOPT	"ilvcn:qVH"
 
-extern void exit();
-extern void backtrans();
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
 #ifdef DL
 extern void dl();
 #endif /* DL */
--- a/util/transname.c
+++ b/util/transname.c
@@ -1,7 +1,6 @@
 #include <sys/types.h>
 #include <sys/dir.h>
-
-char *strncpy();
+#include <string.h>
 
 #ifdef MAXNAMLEN	/* 4.2 BSD */
 #define FNAMELEN MAXNAMLEN
--- a/util/util.c
+++ b/util/util.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <unistd.h>
 #include "../fileio/fileglob.h"
 #include "masks.h"
 #include "util.h"
--- a/util/util.h
+++ b/util/util.h
@@ -16,8 +16,11 @@
 extern int do_query();
 extern void put4();
 extern void put2();
-extern void do_indent();
+extern void do_indent(int);
 extern real_time set_time();
 extern unsigned long tomactime();
 extern real_time frommactime();
 
+extern void transname(char *, char *, int);
+
+extern void backtrans(char *, char *);
--- a/comm/tty.c
+++ b/comm/tty.c
@@ -1,4 +1,6 @@
 #include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
 #include <signal.h>
 #ifndef TERMIOS_H
 #include <sgtty.h>
@@ -10,7 +12,7 @@
 #include "protocol.h"
 #include "globals.h"
 
-void cleanup();
+void cleanup(int);
 void timedout();
 int tgetc();
 void tputc();
@@ -101,7 +103,7 @@
     }
 }
 
-tgetrec(buf, count, timeout)
+int tgetrec(buf, count, timeout)
 char *buf;
 int count, timeout;
 {
--- a/comm/xm_from.c
+++ b/comm/xm_from.c
@@ -4,11 +4,14 @@
 #include "../fileio/machdr.h"
 #include "../fileio/wrfile.h"
 #include "../util/masks.h"
+#include "../util/util.h"
 #include "globals.h"
 #include "protocol.h"
 
+extern void cleanup(int);
+
 extern int tgetc();
-extern int tgetrec();
+extern int tgetrec(char *, int, int);
 extern void tputc();
 
 static void receive_part();
@@ -89,7 +92,7 @@
 	case ESC:
 	    break;
 	case CAN:
-	    cleanup();
+	    cleanup(-1);
 	    break;
 	case EOT:
 	case TMO:
--- a/comm/xm_to.c
+++ b/comm/xm_to.c
@@ -6,6 +6,8 @@
 #include "globals.h"
 #include "protocol.h"
 
+extern void cleanup(int);
+
 extern int tgetc();
 extern void tputc();
 extern void tputrec();
--- a/comm/frommac.c
+++ b/comm/frommac.c
@@ -1,16 +1,21 @@
 #include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
 #include "comm.h"
+#include "../util/util.h"
 #include "../util/patchlevel.h"
 #include "../fileio/machdr.h"
 #include "globals.h"
 #include "../fileio/fileglob.h"
 #include "../fileio/wrfile.h"
+#include "../fileio/wrfileopt.h"
 
 #define LOCALOPT	"lmxyzoTVH"
 
-extern void exit();
 extern void setup_tty();
 extern void reset_tty();
+extern void xm_from(void);
 
 extern char info[];
 
--- a/comm/tomac.c
+++ b/comm/tomac.c
@@ -1,19 +1,20 @@
 #include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
 #include "comm.h"
 #include "../fileio/machdr.h"
 #include "../fileio/rdfile.h"
+#include "../fileio/rdfileopt.h"
 #include "../util/patchlevel.h"
+#include "../util/util.h"
 #include "globals.h"
 
-extern char *malloc();
-extern char *realloc();
-extern char *strcat();
-extern void exit();
-extern void transname();
 extern void do_indent();
 extern void dofile();
 extern void setup_tty();
 extern void reset_tty();
+extern void xm_to(void);
 
 #define LOCALOPT	"ilqxyzoTVH"
 
--- a/fileio/rdfileopt.h
+++ b/fileio/rdfileopt.h
@@ -1,5 +1,5 @@
 extern int rdfileopt();
 extern void give_rdfileopt();
 extern void set_norecurse();
-extern char *get_rdfileopt();
+extern const char *get_rdfileopt(void);
 
--- a/binhex/binhex.c
+++ b/binhex/binhex.c
@@ -1,15 +1,14 @@
 #include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
 #include "../fileio/machdr.h"
 #include "../fileio/rdfile.h"
+#include "../fileio/rdfileopt.h"
 #include "../util/patchlevel.h"
+#include "../util/util.h"
 
-extern char *malloc();
-extern char *realloc();
-extern char *strcat();
-extern void exit();
-extern void transname();
-extern void do_indent();
-extern void dofile();
+extern void dofile(void);
 
 #define LOCALOPT	"RilqVH"
 
--- a/binhex/dofile.c
+++ b/binhex/dofile.c
@@ -1,3 +1,6 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<unistd.h>
 #include "../fileio/machdr.h"
 #include "../fileio/rdfile.h"
 
@@ -15,13 +18,13 @@
 static int rep_char;
 static int rep_count;
 
-void doheader();
-void dofork();
-void outbyte();
-void finish();
-void outbyte1();
-void out6bit();
-void outchar();
+void doheader(void);
+void dofork(char *, int);
+void outbyte(int);
+void finish(void);
+void outbyte1(int);
+void out6bit(char);
+void outchar(char);
 
 void dofile()
 {
--- a/hexbin/globals.h
+++ b/hexbin/globals.h
@@ -13,7 +13,7 @@
 extern char info[];
 extern char trname[];
 
-typedef struct macheader {
+struct macheader {
 	char m_name[128];
 	char m_type[4];
 	char m_author[4];
--- a/hexbin/hqx.c
+++ b/hexbin/hqx.c
@@ -1,3 +1,5 @@
+#include<stdlib.h>
+#include<unistd.h>
 #include "hexbin.h"
 #ifdef HQX
 #include "globals.h"
@@ -9,14 +11,12 @@
 #include "../util/util.h"
 #include "printhdr.h"
 
-extern void exit();
-
-static void get_header();
-static void oflush();
-static int getq();
-static long get2q();
-static long get4q();
-static getqbuf();
+static void get_header(void);
+static void oflush(void);
+static int getq(void);
+static long get2q(void);
+static long get4q(void);
+static int getqbuf(char *, int);
 
 static char *g_macname;
 
@@ -380,7 +380,7 @@
 }
 
 /* getqbuf(); q format -- read n characters from input into buf */
-static getqbuf(buf, n)
+static int getqbuf(buf, n)
     char *buf;
     int n;
 {
--- a/hexbin/printhdr.c
+++ b/hexbin/printhdr.c
@@ -34,6 +34,7 @@
 
 /* print out header information in human-readable format */
 void print_header2(skip)
+int skip;
 {
     if(listmode) {
 	if(skip) {
--- a/hexbin/readline.h
+++ b/hexbin/readline.h
@@ -1,2 +1,4 @@
 extern char line[];
 
+extern int readline(void);
+
--- a/macunpack/bin.c
+++ b/macunpack/bin.c
@@ -1,3 +1,4 @@
+#include <string.h>
 #include "macunpack.h"
 #ifdef BIN
 #include "globals.h"
--- a/macunpack/cpt.c
+++ b/macunpack/cpt.c
@@ -1,3 +1,4 @@
+#include <stdlib.h>
 #include "macunpack.h"
 #ifdef DD
 #ifndef CPT
@@ -21,10 +22,6 @@
 #define ESC1SEEN	1
 #define ESC2SEEN	2
 
-extern char *malloc();
-extern char *realloc();
-extern int free();
-
 static void cpt_uncompact();
 static unsigned char *cpt_data;
 static unsigned long cpt_datamax;
--- a/macunpack/cpt.h
+++ b/macunpack/cpt.h
@@ -31,7 +31,7 @@
 
 typedef long	OSType;
 
-typedef struct cptHdr {			/* 8 bytes */
+struct cptHdr {			/* 8 bytes */
 	unsigned char	signature;	/* = 1 -- for verification */
 	unsigned char	volume;		/* for multi-file archives */
 	unsigned short	xmagic;		/* verification multi-file consistency*/
@@ -42,7 +42,7 @@
 	unsigned char	commentsize;	/* number of bytes comment that follow*/
 };
 
-typedef struct fileHdr {		/* 78 bytes */
+struct fileHdr {		/* 78 bytes */
 	unsigned char	fName[32];	/* a STR32 */
 	unsigned char	folder;		/* set to 1 if a folder */
 	unsigned short	foldersize;	/* number of entries in folder */
--- a/macunpack/dd.c
+++ b/macunpack/dd.c
@@ -1,3 +1,5 @@
+#include <stdlib.h>
+#include <string.h>
 #include "macunpack.h"
 #ifdef DD
 #include "globals.h"
@@ -9,10 +11,6 @@
 #include "../util/masks.h"
 #include "../util/util.h"
 
-extern char *malloc();
-extern char *realloc();
-extern char *strcpy();
-extern char *strncpy();
 extern void cpt_wrfile1();
 extern void core_compress();
 extern void de_compress();
@@ -45,7 +43,7 @@
 #endif /* UNTESTED */
 static void dd_cpt_compat();
 
-typedef struct methodinfo {
+struct methodinfo {
 	char *name;
 	int number;
 };
--- a/macunpack/dd.h
+++ b/macunpack/dd.h
@@ -52,7 +52,7 @@
 
 typedef long OSType;
 
-typedef struct fileHdr {		/* 124 bytes */
+struct fileHdr {		/* 124 bytes */
 	unsigned char	magic[4];	/* "DDAR" */
 	unsigned char	fill1[4];	/* ??? */
 	unsigned char	fName[64];	/* a STR63 */
@@ -73,7 +73,7 @@
 	unsigned short	hdrcrc;		/* true crc */
 };
 
-typedef struct fileCHdr {		/* 84 bytes */
+struct fileCHdr {		/* 84 bytes */
 	unsigned char	magic[4];	/* "\253\315\000\124" */
 	unsigned long	dataLength;	/* lengths */
 	unsigned long	dataCLength;
@@ -121,5 +121,5 @@
 #define	cpt_compat	8
 #define	method9		9
 
-#define	ESC		0x144	/* Repeat packing escape */
+#define	ESC		(char)0x144	/* Repeat packing escape */
 
--- a/macunpack/dia.c
+++ b/macunpack/dia.c
@@ -1,3 +1,5 @@
+#include <stdlib.h>
+#include <string.h>
 #include "macunpack.h"
 #ifdef DIA
 #include "globals.h"
@@ -9,9 +11,6 @@
 #include "../fileio/kind.h"
 #include "../util/util.h"
 
-extern char *malloc();
-extern char *realloc();
-
 static unsigned char *dia_archive;
 static int dia_archive_size;
 static int dia_max_archive_size;
--- a/macunpack/dir.c
+++ b/macunpack/dir.c
@@ -1,12 +1,10 @@
+#include <stdlib.h>
 #include "globals.h"
 #include "../fileio/machdr.h"
 #include "../fileio/wrfile.h"
 #include "../util/util.h"
 #include "../util/masks.h"
 
-extern char *malloc();
-extern char *realloc();
-
 static char *dir_stack;
 static int dir_ptr = -64;
 static int dir_max;
--- a/macunpack/huffman.h
+++ b/macunpack/huffman.h
@@ -12,3 +12,4 @@
 extern struct node nodelist[];
 extern int bytesread;
 
+extern int gethuffbyte(node *);
--- a/macunpack/jdw.h
+++ b/macunpack/jdw.h
@@ -8,7 +8,7 @@
 #define	J_MTIME		34
 #define	J_FLENGTH	38
 
-typedef struct fileHdr {
+struct fileHdr {
 	char		magic[6];
 	unsigned long	type;
 	unsigned long	auth;
--- a/macunpack/lzc.c
+++ b/macunpack/lzc.c
@@ -1,3 +1,4 @@
+#include <string.h>
 #include "macunpack.h"
 #ifdef LZC
 #include "globals.h"
--- a/macunpack/lzc.h
+++ b/macunpack/lzc.h
@@ -12,7 +12,7 @@
 #define C_AUTHOFF	36
 #define C_FLAGOFF	40
 
-typedef struct fileHdr {
+struct fileHdr {
 	unsigned long	magic1;
 	unsigned long	dataLength;
 	unsigned long	dataCLength;
--- a/macunpack/lzh.c
+++ b/macunpack/lzh.c
@@ -1,3 +1,5 @@
+#include <stdlib.h>
+#include <string.h>
 #include "macunpack.h"
 #ifdef LZH
 #include "globals.h"
@@ -17,13 +19,11 @@
 #define LZSMASK		4095
 #define LZBUFFSIZE	8192	/* Max of above buffsizes */
 
-extern char *malloc();
-extern char *realloc();
 extern void de_lzah();
 extern unsigned char (*lzah_getbyte)();
 extern void de_lzh();
 
-typedef struct methodinfo {
+struct methodinfo {
 	char *name;
 	int number;
 };
--- a/macunpack/lzh.h
+++ b/macunpack/lzh.h
@@ -30,7 +30,7 @@
 #define L_EEXTENDSZ	0
 #define L_EEXTEND	1
 
-typedef struct fileHdr { /* 58 bytes */
+struct fileHdr { /* 58 bytes */
 	unsigned char	hsize;
 	unsigned char	hcrc;
 	char		method[5];
--- a/macunpack/macbinary.c
+++ b/macunpack/macbinary.c
@@ -1,3 +1,5 @@
+#include <stdlib.h>
+#include <string.h>
 #include "macunpack.h"
 #include "globals.h"
 #include "../fileio/machdr.h"
--- a/macunpack/macunpack.c
+++ b/macunpack/macunpack.c
@@ -1,3 +1,6 @@
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
 #include "macunpack.h"
 #include "globals.h"
 #include "../util/patchlevel.h"
@@ -8,7 +11,6 @@
 
 #define LOCALOPT	"ilvqVH"
 
-extern char *strcat();
 #ifdef STF
 extern void stf();
 #endif /* STF */
--- a/macunpack/pit.c
+++ b/macunpack/pit.c
@@ -1,3 +1,4 @@
+#include <string.h>
 #include "macunpack.h"
 #ifdef PIT
 #include "../fileio/wrfile.h"
@@ -14,6 +15,7 @@
 extern void read_tree();
 extern void de_huffman();
 extern void set_huffman();
+extern int getihuffbyte(void);
 
 static int pit_filehdr();
 static void pit_wrfile();
--- a/macunpack/sit.c
+++ b/macunpack/sit.c
@@ -1,3 +1,4 @@
+#include <string.h>
 #include "macunpack.h"
 #ifdef SIT
 #include "globals.h"
@@ -19,7 +20,7 @@
 extern void de_lzah();
 extern unsigned char (*lzah_getbyte)();
 
-typedef struct methodinfo {
+struct methodinfo {
 	char *name;
 	int number;
 };
--- a/macunpack/sit.h
+++ b/macunpack/sit.h
@@ -24,7 +24,7 @@
 
 typedef long OSType;
 
-typedef struct sitHdr {			/* 22 bytes */
+struct sitHdr {			/* 22 bytes */
 	OSType	signature;		/* = 'SIT!' -- for verification */
 	unsigned short	numFiles;	/* number of files in archive */
 	unsigned long	arcLength;	/* length of entire archive incl.
@@ -34,7 +34,7 @@
 	char reserved[7];
 };
 
-typedef struct fileHdr {		/* 112 bytes */
+struct fileHdr {		/* 112 bytes */
 	unsigned char	compRMethod;	/* rsrc fork compression method */
 	unsigned char	compDMethod;	/* data fork compression method */
 	unsigned char	fName[64];	/* a STR63 */
--- a/macunpack/stf.c
+++ b/macunpack/stf.c
@@ -1,3 +1,4 @@
+#include <string.h>
 #include "macunpack.h"
 #ifdef STF
 #include "stf.h"
--- a/macunpack/stf.h
+++ b/macunpack/stf.h
@@ -5,7 +5,7 @@
 #define	S_RSRCLNGTH	3	/* + NAMELENGTH */
 #define	S_DATALNGTH	7	/* + NAMELENGTH */
 
-typedef struct fileHdr {
+struct fileHdr {
 	char		magic[3];
 	char		flength;
 	char		fname[32];	/* actually flength */
--- a/macunpack/zma.c
+++ b/macunpack/zma.c
@@ -1,3 +1,6 @@
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
 #include "macunpack.h"
 #ifdef ZMA
 #include "globals.h"
@@ -9,8 +12,6 @@
 #include "../util/masks.h"
 #include "../util/util.h"
 
-extern char *malloc();
-extern char *realloc();
 extern void de_lzh();
 
 /* We do allow for possible backpointing, so we allocate the archive in core */
--- a/macunpack/zma.h
+++ b/macunpack/zma.h
@@ -20,7 +20,7 @@
 #define	Z_RCRC		44	/* Resource crc */
 #define	Z_FNAME		46	/* File name length and name */
 
-typedef struct fileHdr {		/* 78 bytes */
+struct fileHdr {		/* 78 bytes */
 	char		deleted;	/* Not in original, split off from: */
 	char		what;		/* What kind?  Negative if deleted */
 	unsigned char	hlen ;		/* Header length */
--- a/mixed/dir.c
+++ b/mixed/dir.c
@@ -1,12 +1,11 @@
+#include <stdlib.h>
+#include <unistd.h>
 #include "globals.h"
 #include "../fileio/machdr.h"
 #include "../fileio/wrfile.h"
 #include "../util/util.h"
 #include "../util/masks.h"
 
-extern char *malloc();
-extern char *realloc();
-
 static char *dir_stack;
 static int dir_ptr = -64;
 static int dir_max;
--- a/mixed/macsave.c
+++ b/mixed/macsave.c
@@ -1,3 +1,4 @@
+#include <unistd.h>
 #include "globals.h"
 #include "../util/patchlevel.h"
 #include "../fileio/wrfile.h"
--- a/mixed/macstream.c
+++ b/mixed/macstream.c
@@ -1,15 +1,12 @@
 #include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
 #include "../fileio/machdr.h"
 #include "../fileio/rdfile.h"
 #include "../fileio/rdfileopt.h"
 #include "../util/patchlevel.h"
-
-extern char *malloc();
-extern char *realloc();
-extern char *strcat();
-extern void exit();
-extern void transname();
-extern void do_indent();
+#include "../util/util.h"
 
 #define LOCALOPT	"ilqVH"