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The start of KNF + -Wall.  The code has been run through indent but
needs hand fixup.  I stopped at keymap.c...

/*
 * This file is the general header file for all parts
 * of the Mg display editor. It contains all of the
 * general definitions and macros. It also contains some
 * conditional compilation flags. All of the per-system and
 * per-terminal definitions are in special header files.
 * The most common reason to edit this file would be to zap
 * the definition of CVMVAS or BACKUP.
 */
#include	"sysdef.h"	/* Order is critical.		 */
#include	"ttydef.h"
#include	"chrdef.h"

/*
 * If your system and/or compiler does not support the "void" type
 * then define NO_VOID_TYPE in sysdef.h.  In the absence of some
 * other definition for VOID, the default in that case will be to
 * turn it into an int, which works with most compilers that don't
 * support void.  In the absence of any definition of VOID or
 * NO_VOID_TYPE, the default is to assume void is supported, which
 * should be the case for most modern C compilers.
 */

#ifdef NO_VOID_TYPE
#undef VOID
#define VOID int		/* Default for no void is int */
#else
#ifndef VOID
#define VOID void		/* Just use normal void */
#endif				/* VOID */
#endif				/* NO_VOID_TYPE */

#ifdef	NO_MACRO
#ifndef NO_STARTUP
#define NO_STARTUP		/* NO_MACRO implies NO_STARTUP */
#endif
#endif

typedef int     (*PF) ();	/* generaly useful type */

/*
 * Table sizes, etc.
 */
#define NFILEN	80		/* Length, file name.		 */
#define NBUFN	24		/* Length, buffer name.		 */
#define NLINE	256		/* Length, line.		 */
#define PBMODES 4		/* modes per buffer		 */
#define NKBDM	256		/* Length, keyboard macro.	 */
#define NPAT	80		/* Length, pattern.		 */
#define HUGE	1000		/* A rather large number.	 */
#define NSRCH	128		/* Undoable search commands.	 */
#define NXNAME	64		/* Length, extended command.	 */
#define NKNAME	20		/* Length, key names		 */
/*
 * Universal.
 */
#define FALSE	0		/* False, no, bad, etc.		 */
#define TRUE	1		/* True, yes, good, etc.	 */
#define ABORT	2		/* Death, ^G, abort, etc.	 */

#define KPROMPT 2		/* keyboard prompt		 */

/*
 * These flag bits keep track of
 * some aspects of the last command. The CFCPCN
 * flag controls goal column setting. The CFKILL
 * flag controls the clearing versus appending
 * of data in the kill buffer.
 */
#define CFCPCN	0x0001		/* Last command was C-P, C-N	 */
#define CFKILL	0x0002		/* Last command was a kill	 */
#define CFINS	0x0004		/* Last command was self-insert */

/*
 * File I/O.
 */
#define FIOSUC	0		/* Success.			 */
#define FIOFNF	1		/* File not found.		 */
#define FIOEOF	2		/* End of file.			 */
#define FIOERR	3		/* Error.			 */
#define FIOLONG 4		/* long line partially read	 */

/*
 * Directory I/O.
 */
#define DIOSUC	0		/* Success.			 */
#define DIOEOF	1		/* End of file.			 */
#define DIOERR	2		/* Error.			 */

/*
 * Display colors.
 */
#define CNONE	0		/* Unknown color.		 */
#define CTEXT	1		/* Text color.			 */
#define CMODE	2		/* Mode line color.		 */

/*
 * Flags for keyboard involked functions.
 */
#define FFUNIV		1	/* universal argument		 */
#define FFNEGARG	2	/* negitive only argument	 */
#define FFOTHARG	4	/* other argument		 */
#define FFARG		7	/* any argument			 */
#define FFRAND		8	/* Called by other function	 */

/*
 * Flags for "eread".
 */
#define EFFUNC	0x0001		/* Autocomplete functions.	 */
#define EFBUF	0x0002		/* Autocomplete buffers.	 */
#define EFFILE	0x0004		/* " files (maybe someday)	 */
#define EFAUTO	0x0007		/* Some autocompleteion on	 */
#define EFNEW	0x0008		/* New prompt.			 */
#define EFCR	0x0010		/* Echo CR at end; last read.	 */

/*
 * Flags for "ldelete"/"kinsert"
 */
#define KNONE	0
#define KFORW	1
#define KBACK	2

/*
 * All text is kept in circularly linked
 * lists of "LINE" structures. These begin at the
 * header line (which is the blank line beyond the
 * end of the buffer). This line is pointed to by
 * the "BUFFER". Each line contains a the number of
 * bytes in the line (the "used" size), the size
 * of the text array, and the text. The end of line
 * is not stored as a byte; it's implied. Future
 * additions will include update hints, and a
 * list of marks into the line.
 */
typedef struct LINE {
	struct LINE    *l_fp;	/* Link to the next line	 */
	struct LINE    *l_bp;	/* Link to the previous line	 */
	int             l_size;	/* Allocated size		 */
	int             l_used;	/* Used size			 */
#ifndef ZEROARRAY
	char            l_text[1];	/* A bunch of chars.	 */
#else
	char            l_text[];	/* A bunch of chars.	 */
#endif
} LINE;

/*
 * The rationale behind these macros is that you
 * could (with some editing, like changing the type of a line
 * link from a "LINE *" to a "REFLINE", and fixing the commands
 * like file reading that break the rules) change the actual
 * storage representation of lines to use something fancy on
 * machines with small address spaces.
 */
#define lforw(lp)	((lp)->l_fp)
#define lback(lp)	((lp)->l_bp)
#define lgetc(lp, n)	(CHARMASK((lp)->l_text[(n)]))
#define lputc(lp, n, c) ((lp)->l_text[(n)]=(c))
#define llength(lp)	((lp)->l_used)
#define ltext(lp)	((lp)->l_text)

/*
 * All repeated structures are kept as linked lists of structures.
 * All of these start with a LIST structure (except lines, which
 * have their own abstraction). This will allow for
 * later conversion to generic list manipulation routines should
 * I decide to do that. it does mean that there are four extra
 * bytes per window. I feel that this is an acceptable price,
 * considering that there are usually only one or two windows.
 */
typedef struct LIST {
	union {
		struct MGWIN   *l_wp;
		struct BUFFER  *x_bp;	/* l_bp is used by LINE */
		struct LIST    *l_nxt;
	} l_p;
	char *l_name;
} LIST;

/*
 * Usual hack - to keep from uglifying the code with lotsa
 * references through the union, we #define something for it.
 */
#define l_next	l_p.l_nxt

/*
 * There is a window structure allocated for
 * every active display window. The windows are kept in a
 * big list, in top to bottom screen order, with the listhead at
 * "wheadp". Each window contains its own values of dot and mark.
 * The flag field contains some bits that are set by commands
 * to guide redisplay; although this is a bit of a compromise in
 * terms of decoupling, the full blown redisplay is just too
 * expensive to run for every input character.
 */
typedef struct MGWIN {
	LIST            w_list;		/* List header			*/
	struct BUFFER  *w_bufp;		/* Buffer displayed in window	*/
	struct LINE    *w_linep;	/* Top line in the window	*/
	struct LINE    *w_dotp;		/* Line containing "."		*/
	struct LINE    *w_markp;	/* Line containing "mark"	*/
	int             w_doto;		/* Byte offset for "."		*/
	int             w_marko;	/* Byte offset for "mark"	*/
	char            w_toprow;	/* Origin 0 top row of window	*/
	char            w_ntrows;	/* # of rows of text in window	*/
	char            w_force;	/* If NZ, forcing row.		*/
	char            w_flag;		/* Flags.			*/
} MGWIN;
#define w_wndp	w_list.l_p.l_wp
#define w_name	w_list.l_name

/*
 * Window flags are set by command processors to
 * tell the display system what has happened to the buffer
 * mapped by the window. Setting "WFHARD" is always a safe thing
 * to do, but it may do more work than is necessary. Always try
 * to set the simplest action that achieves the required update.
 * Because commands set bits in the "w_flag", update will see
 * all change flags, and do the most general one.
 */
#define WFFORCE 0x01		/* Force reframe.		 */
#define WFMOVE	0x02		/* Movement from line to line.	 */
#define WFEDIT	0x04		/* Editing within a line.	 */
#define WFHARD	0x08		/* Better to a full display.	 */
#define WFMODE	0x10		/* Update mode line.		 */

/*
 * Text is kept in buffers. A buffer header, described
 * below, exists for every buffer in the system. The buffers are
 * kept in a big list, so that commands that search for a buffer by
 * name can find the buffer header. There is a safe store for the
 * dot and mark in the header, but this is only valid if the buffer
 * is not being displayed (that is, if "b_nwnd" is 0). The text for
 * the buffer is kept in a circularly linked list of lines, with
 * a pointer to the header line in "b_linep".
 */
typedef struct BUFFER {
	LIST            b_list;		/* buffer list pointer		 */
	struct BUFFER  *b_altb;		/* Link to alternate buffer	 */
	struct LINE    *b_dotp;		/* Link to "." LINE structure	 */
	struct LINE    *b_markp;	/* ditto for mark		 */
	struct LINE    *b_linep;	/* Link to the header LINE	 */
	struct MAPS_S  *b_modes[PBMODES]; /* buffer modes		 */
	int             b_doto;		/* Offset of "." in above LINE	 */
	int             b_marko;	/* ditto for the "mark"		 */
	short           b_nmodes;	/* number of non-fundamental modes */
	char            b_nwnd;		/* Count of windows on buffer	 */
	char            b_flag;		/* Flags			 */
	char            b_fname[NFILEN];/* File name			 */
	struct fileinfo b_fi;		/* File attributes		 */
} BUFFER;
#define b_bufp	b_list.l_p.x_bp
#define b_bname b_list.l_name

#define BFCHG	0x01		/* Changed.			 */
#define BFBAK	0x02		/* Need to make a backup.	 */
#ifdef	NOTAB
#define BFNOTAB 0x04		/* no tab mode			 */
#endif
#define BFOVERWRITE 0x08	/* overwrite mode		 */

/*
 * This structure holds the starting position
 * (as a line/offset pair) and the number of characters in a
 * region of a buffer. This makes passing the specification
 * of a region around a little bit easier.
 */
typedef struct {
	struct LINE    *r_linep;	/* Origin LINE address.		 */
	int             r_offset;	/* Origin LINE offset.		 */
	RSIZE           r_size;		/* Length in characters.	 */
} REGION;

/*
 * Prototypes.
 */

/* tty.c */
VOID	 ttinit		__P((void));
VOID	 ttreinit	__P((void));
VOID	 tttidy		__P((void));
VOID	 ttmove		__P((int, int));
VOID	 tteeol		__P((void));
VOID	 tteeop		__P((void));
VOID	 ttbeep		__P((void));
VOID	 ttinsl		__P((int, int, int));
VOID	 ttdell		__P((int, int, int));
VOID	 ttwindow	__P((int, int));
VOID	 ttnowindow	__P((void));
VOID	 ttcolor	__P((int));
VOID	 ttresize	__P((void));

/* ttyio.c */
VOID	 ttopen		__P((void));
int	 ttraw		__P((void));
VOID	 ttclose	__P((void));
int	 ttcooked	__P((void));
int	 ttputc		__P((int));
VOID	 ttflush	__P((void));
int	 ttgetc		__P((void));
int	 ttwait		__P((void));
VOID	 setttysize	__P((void));
int	 typeahead	__P((void));

/* dir.c */
VOID	 dirinit	__P((VOID));
int	 changedir	__P((int, int));
int	 showcwdir	__P((int, int));

/* dired.c */
int	 dired		__P((int, int));
int	 d_otherwindow	__P((int, int));
int	 d_undel	__P((int, int));
int	 d_undelbak	__P((int, int));
int	 d_findfile	__P((int, int));
int	 d_ffotherwindow __P((int, int));
int	 d_expunge	__P((int, int));
int	 d_copy		__P((int, int));
int	 d_del		__P((int, int));
int	 d_rename	__P((int, int));

/* file.c */
int	 fileinsert	__P((int, int));
int	 filevisit	__P((int, int));
int	 poptofile	__P((int, int));
BUFFER  *findbuffer	__P((char *));
int	 readin		__P((char *));
int	 insertfile	__P((char *, char *, int));
VOID     makename	__P((char *, char *));
int	 filewrite	__P((int, int));
int	 filesave	__P((int, int));
int	 buffsave	__P((BUFFER *));
int	 makebkfile	__P((int, int));
int	 writeout	__P((BUFFER *, char *));
VOID     upmodes	__P((BUFFER *));

/* line.c */
LINE    *lalloc		__P((int));
LINE    *lallocx	__P((int));
int	 lnewline	__P((void));
VOID	 lfree		__P((LINE *));
VOID     lchange	__P((int));
VOID     kdelete	__P((void));
int      ldelnewline	__P((void));
int	 linsert	__P((int, int));

/* window.c */
MGWIN   *wpopup		__P((void));
int	 nextwind	__P((int, int));

/* buffer.c */
BUFFER  *bfind		__P((char *, int));
int	 poptobuffer	__P((int, int));
int	 killbuffer	__P((int, int));
int	 savebuffers	__P((int, int));
int	 listbuffers	__P((int, int));
int	 addline	__P((BUFFER *, char *));
int	 anycb		__P((int));
int	 bclear		__P((BUFFER *));
int	 showbuffer	__P((BUFFER *, MGWIN *, int));
MGWIN   *popbuf		__P((BUFFER *));
int	 bufferinsert	__P((int, int));
int	 usebuffer	__P((int, int));
int	 notmodified	__P((int, int));
int	 popbuftop	__P((BUFFER *));

/* display.c */
VOID     vtinit		__P((void));
VOID     vttidy		__P((void));
VOID     update		__P((void));

/* echo.c */
int	 eyorn		__P((char *));
int	 eyesno		__P((char *));
VOID     ewprintf	__P((const char *fmt, ...));
int	 ereply		__P((const char *, char *, int, ...));
int	 eread		__P((const char *, char *, int, int, ...));
int	 getxtra	__P((LIST *, LIST *, int, int));

/* fileio.c */
int	 ffropen	__P((char *, BUFFER *));
int	 ffwopen	__P((char *, BUFFER *));
int	 ffclose	__P((BUFFER *));
int	 ffputbuf	__P((BUFFER *));
int	 ffgetline	__P((char *, int, int *));
int      fbackupfile	__P((char *));
char    *adjustname	__P((char *));
char    *startupfile	__P((char *));
int      copy		__P((char *, char *));
BUFFER  *dired_		__P((char *));
int	 d_makename	__P((LINE  *, char *));
LIST    *make_file_list	__P((char *, int));

/* keymap.c */
LIST	*complete_function_list	__P((char *, int));
int	 complete_function	__P((char *, int));

/* kbd.c */
int	 do_meta	__P((int, int));
int	 bsmap		__P((int, int));
VOID	 ungetkey	__P((int));
int	 getkey		__P((int));
int	 doin		__P((void));
int	 rescan		__P((int, int));
int	 universal_argument __P((int, int));
int	 digit_argument	__P((int, int));
int	 negative_argument __P((int, int));
int	 selfinsert	__P((int, int));
int	 quote		__P((int, int));

/* main.c */
int	 ctrlg		__P((int, int));

/* ttyio.c */
VOID     panic		__P((char *));

/* cinfo.c */
char    *keyname	__P((char  *, int));

/* basic.c */
int	 gotobol	__P((int, int));
int	 backchar	__P((int, int));
int	 gotoeol	__P((int, int));
int	 forwchar	__P((int, int));
int	 gotobob	__P((int, int));
int	 gotoeob	__P((int, int));
int	 forwline	__P((int, int));
int	 backline	__P((int, int));
VOID	 setgoal	__P((void));
int	 getgoal	__P((LINE *));
int	 forwpage	__P((int, int));
int	 backpage	__P((int, int));
int	 forw1page	__P((int, int));
int	 back1page	__P((int, int));
int	 pagenext	__P((int, int));
VOID	 isetmark	__P((VOID));
int	 setmark	__P((int, int));
int	 swapmark	__P((int, int));
int	 gotoline	__P((int, int));

/* random.c */
int	 getcolpos	__P((void));
int	 newline	__P((int, int));

/* extend.c */
int	 insert		__P((int, int));
int	 bindtokey	__P((int, int));
int	 localbind	__P((int, int));
int	 define_key	__P((int, int));
int	 unbindtokey	__P((int, int));
int	 localunbind	__P((int, int));
int	 extend		__P((int, int));
int	 evalexpr	__P((int, int));
int	 evalbuffer	__P((int, int));
int	 evalfile	__P((int, int));
int	 load		__P((char *));
int	 excline	__P((char *));

/* help.c */
int	 desckey	__P((int, int));
int	 wallchart	__P((int, int));
int	 help_help	__P((int, int));
int	 apropos_command __P((int, int));

/*
 * Externals.
 */
extern int      thisflag;
extern int      lastflag;
extern int      curgoal;
extern int      epresf;
extern int      sgarbf;
extern int      mode;
extern MGWIN   *curwp;
extern BUFFER  *curbp;
extern MGWIN   *wheadp;
extern BUFFER  *bheadp;
extern char     pat[];
extern int      nrow;
extern int      ncol;
extern int      ttrow;
extern int      ttcol;
extern int      tthue;
extern int      tceeol;
extern int      tcinsl;
extern int      tcdell;
extern char     cinfo[];
extern char    *keystrings[];