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emacs handles the undo of a region kill (C-w) differently than a line kill
(C-k) with respect to cursor position. The former leaves the cursor at the end,
the latter at the beginning of the region.

emacs is wacky.

Make mg undo do the same. ok deraadt

/*	$OpenBSD: def.h,v 1.112 2009/06/05 18:02:06 kjell Exp $	*/

/* This file is in the public domain. */

/*
 * 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.
 */

#include	"sysdef.h"	/* Order is critical.		 */
#include	"ttydef.h"
#include	"chrdef.h"

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

typedef int	(*PF)(int, int);	/* generally useful type */

/*
 * Table sizes, etc.
 */
#define NFILEN	1024		/* Length, file name.		 */
#define NBUFN	NFILEN		/* 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.		 */
#define NTIME	50		/* Length, timestamp string.	 */
/*
 * Universal.
 */
#define FALSE	0		/* False, no, bad, etc.		 */
#define TRUE	1		/* True, yes, good, etc.	 */
#define ABORT	2		/* Death, ^G, abort, etc.	 */

#define KCLEAR	2		/* clear echo area		 */

/*
 * 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	 */
#define FIODIR 5		/* File is a directory		 */

/*
 * 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 invoked functions.
 */
#define FFUNIV		1	/* universal argument		 */
#define FFNEGARG	2	/* negative 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 autocompletion on	 */
#define EFNEW	0x0008		/* New prompt.			 */
#define EFCR	0x0010		/* Echo CR at end; last read.	 */
#define EFDEF	0x0020		/* buffer contains default args	 */
#define EFNUL	0x0040		/* Null Minibuffer OK		 */

/*
 * Direction of insert into kill ring
 */
#define KNONE	0x00
#define KFORW	0x01		/* forward insert into kill ring */
#define KBACK	0x02		/* Backwards insert into kill ring */
#define KREG	0x04		/* This is a region-based kill */

/*
 * 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.
 */
struct region {
	struct line	*r_linep;	/* Origin line address.		 */
	int		 r_offset;	/* Origin line offset.		 */
	int		 r_lineno;	/* Origin line number		 */
	RSIZE		 r_size;	/* Length in characters.	 */
};


/*
 * 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" structure. Each line contains 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.
 */
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			 */
	char		*l_text;	/* Content of the line		 */
};

/*
 * The rationale behind these macros is that you
 * could (with some editing, like changing the type of a line
 * link from a "struct 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.
 */
struct list {
	union {
		struct mgwin	*l_wp;
		struct buffer	*x_bp;	/* l_bp is used by struct line */
		struct list	*l_nxt;
	} l_p;
	char *l_name;
};

/*
 * 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.
 */
struct mgwin {
	struct 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_frame;	/* #lines to reframe by.	*/
	char		 w_rflag;	/* Redisplay Flags.		*/
	char		 w_flag;	/* Flags.			*/
	struct line	*w_wrapline;
	int		 w_dotline;	/* current line number of dot	*/
	int		 w_markline;	/* current line number of mark	*/
};
#define w_wndp	w_list.l_p.l_wp
#define w_name	w_list.l_name

/*
 * Window redisplay flags are set by command processors to
 * tell the display system what has happened to the buffer
 * mapped by the window. Setting "WFFULL" 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 WFFRAME 0x01			/* Force reframe.		 */
#define WFMOVE	0x02			/* Movement from line to line.	 */
#define WFEDIT	0x04			/* Editing within a line.	 */
#define WFFULL	0x08			/* Do a full display.		 */
#define WFMODE	0x10			/* Update mode line.		 */

/*
 * Window flags
 */
#define WNONE  0x00 			/* No special window options.	*/
#define WEPHEM 0x01 			/* Window is ephemeral.	 	*/

struct undo_rec;

/*
 * 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_headp".
 */
struct buffer {
	struct 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_headp;	/* 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			 */
	char		 b_cwd[NFILEN]; /* working directory		 */
	struct fileinfo	 b_fi;		/* File attributes		 */
	LIST_HEAD(, undo_rec) b_undo;	/* Undo actions list		*/
	int		 b_undopos;	/* Where we were during last undo */
	struct undo_rec *b_undoptr;
	int		 b_dotline;	/* Line number of dot */
	int		 b_markline;	/* Line number of mark */
	int		 b_lines;	/* Number of lines in file	*/
};
#define b_bufp	b_list.l_p.x_bp
#define b_bname b_list.l_name

/* Some helper macros, in case they ever change to functions */
#define bfirstlp(buf)	(lforw((buf)->b_headp))
#define blastlp(buf)	(lback((buf)->b_headp))

#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		 */
#define BFREADONLY  0x10		/* read only mode		 */
#define BFDIRTY     0x20		/* Buffer was modified elsewhere */
#define BFIGNDIRTY  0x40		/* Ignore modifications */
/*
 * This structure holds information about recent actions for the Undo command.
 */
struct undo_rec {
	LIST_ENTRY(undo_rec) next;
	enum {
		INSERT = 1,
		DELETE,
		BOUNDARY,
		MODIFIED,
		DELREG
	} type;
	struct region	 region;
	int		 pos;
	char		*content;
};

/*
 * Prototypes.
 */

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

volatile sig_atomic_t winch_flag;

/* ttyio.c */
void		 ttopen(void);
int		 ttraw(void);
void		 ttclose(void);
int		 ttcooked(void);
int		 ttputc(int);
void		 ttflush(void);
int		 ttgetc(void);
int		 ttwait(int);
int		 charswaiting(void);

/* dir.c */
void		 dirinit(void);
int		 changedir(int, int);
int		 showcwdir(int, int);
int		 getcwdir(char *, size_t);

/* dired.c */
struct buffer	*dired_(char *);

/* file.c X */
int		 fileinsert(int, int);
int		 filevisit(int, int);
int		 filevisitalt(int, int);
int		 filevisitro(int, int);
int		 poptofile(int, int);
struct buffer	*findbuffer(char *);
int		 readin(char *);
int		 insertfile(char *, char *, int);
int		 filewrite(int, int);
int		 filesave(int, int);
int		 buffsave(struct buffer *);
int		 makebkfile(int, int);
int		 writeout(struct buffer *, char *);
void		 upmodes(struct buffer *);

/* line.c X */
struct line	*lalloc(int);
int		 lrealloc(struct line *, int);
void		 lfree(struct line *);
void		 lchange(int);
int		 linsert_str(const char *, int);
int		 linsert(int, int);
int		 lnewline_at(struct line *, int);
int		 lnewline(void);
int		 ldelete(RSIZE, int);
int		 ldelnewline(void);
int		 lreplace(RSIZE, char *);
char *		 linetostr(const struct line *);

/* yank.c X */

void		 kdelete(void);
int		 kinsert(int, int);
int		 kremove(int);
int		 kchunk(char *, RSIZE, int);
int		 killline(int, int);
int		 yank(int, int);

/* window.c X */
struct mgwin	*new_window(struct buffer *);
void		 free_window(struct mgwin *);
int		 reposition(int, int);
int		 redraw(int, int);
int		 do_redraw(int, int, int);
int		 nextwind(int, int);
int		 prevwind(int, int);
int		 onlywind(int, int);
int		 splitwind(int, int);
int		 enlargewind(int, int);
int		 shrinkwind(int, int);
int		 delwind(int, int);

/* buffer.c */
int		 togglereadonly(int, int);
struct buffer   *bfind(const char *, int);
int		 poptobuffer(int, int);
int		 killbuffer(struct buffer *);
int		 killbuffer_cmd(int, int);
int		 savebuffers(int, int);
int		 listbuffers(int, int);
int		 addlinef(struct buffer *, char *, ...);
#define	 addline(bp, text)	addlinef(bp, "%s", text)
int		 anycb(int);
int		 bclear(struct buffer *);
int		 showbuffer(struct buffer *, struct mgwin *, int);
int		 augbname(char *, const char *, size_t);
struct mgwin    *popbuf(struct buffer *, int);
int		 bufferinsert(int, int);
int		 usebuffer(int, int);
int		 notmodified(int, int);
int		 popbuftop(struct buffer *, int);
int		 getbufcwd(char *, size_t);
int		 checkdirty(struct buffer *);

/* display.c */
int		vtresize(int, int, int);
void		vtinit(void);
void		vttidy(void);
void		update(void);
int		linenotoggle(int, int);

/* echo.c X */
void		 eerase(void);
int		 eyorn(const char *);
int		 eyesno(const char *);
void		 ewprintf(const char *fmt, ...);
char		*ereply(const char *, char *, size_t, ...);
char		*eread(const char *, char *, size_t, int, ...);
int		 getxtra(struct list *, struct list *, int, int);
void		 free_file_list(struct list *);

/* fileio.c */
int		 ffropen(const char *, struct buffer *);
void		 ffstat(struct buffer *);
int		 ffwopen(const char *, struct buffer *);
int		 ffclose(struct buffer *);
int		 ffputbuf(struct buffer *);
int		 ffgetline(char *, int, int *);
int		 fbackupfile(const char *);
char		*adjustname(const char *, int);
char		*startupfile(char *);
int		 copy(char *, char *);
struct list	*make_file_list(char *);
int		 fisdir(const char *);
int		 fchecktime(struct buffer *);
int		 fupdstat(struct buffer *);

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

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

/* ttyio.c */
void		 panic(char *);

/* cinfo.c */
char		*getkeyname(char  *, size_t, int);

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

/* random.c X */
int		 showcpos(int, int);
int		 getcolpos(void);
int		 twiddle(int, int);
int		 openline(int, int);
int		 newline(int, int);
int		 deblank(int, int);
int		 justone(int, int);
int		 delwhite(int, int);
int		 delleadwhite(int, int);
int		 deltrailwhite(int, int);
int		 lfindent(int, int);
int		 indent(int, int);
int		 forwdel(int, int);
int		 backdel(int, int);
int		 space_to_tabstop(int, int);

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

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

/* paragraph.c X */
int		 gotobop(int, int);
int		 gotoeop(int, int);
int		 fillpara(int, int);
int		 killpara(int, int);
int		 fillword(int, int);
int		 setfillcol(int, int);

/* word.c X */
int		 backword(int, int);
int		 forwword(int, int);
int		 upperword(int, int);
int		 lowerword(int, int);
int		 capword(int, int);
int		 delfword(int, int);
int		 delbword(int, int);
int		 inword(void);

/* region.c X */
int		 killregion(int, int);
int		 copyregion(int, int);
int		 lowerregion(int, int);
int		 upperregion(int, int);
int		 prefixregion(int, int);
int		 setprefix(int, int);
int		 region_get_data(struct region *, char *, int);
void		 region_put_data(const char *, int);

/* search.c X */
int		 forwsearch(int, int);
int		 backsearch(int, int);
int		 searchagain(int, int);
int		 forwisearch(int, int);
int		 backisearch(int, int);
int		 queryrepl(int, int);
int		 forwsrch(void);
int		 backsrch(void);
int		 readpattern(char *);

/* spawn.c X */
int		 spawncli(int, int);

/* ttykbd.c X */
void		 ttykeymapinit(void);
void		 ttykeymaptidy(void);

/* match.c X */
int		 showmatch(int, int);

/* version.c X */
int		 showversion(int, int);

#ifndef NO_MACRO
/* macro.c X */
int		 definemacro(int, int);
int		 finishmacro(int, int);
int		 executemacro(int, int);
#endif	/* !NO_MACRO */

/* modes.c X */
int		 indentmode(int, int);
int		 fillmode(int, int);
int		 blinkparen(int, int);
#ifdef NOTAB
int		 notabmode(int, int);
#endif	/* NOTAB */
int		 overwrite_mode(int, int);
int		 set_default_mode(int,int);

#ifdef REGEX
/* re_search.c X */
int		 re_forwsearch(int, int);
int		 re_backsearch(int, int);
int		 re_searchagain(int, int);
int		 re_queryrepl(int, int);
int		 replstr(int, int);
int		 setcasefold(int, int);
int		 delmatchlines(int, int);
int		 delnonmatchlines(int, int);
int		 cntmatchlines(int, int);
int		 cntnonmatchlines(int, int);
#endif	/* REGEX */

/* undo.c X */
void		 free_undo_record(struct undo_rec *);
int		 undo_dump(int, int);
int		 undo_enabled(void);
int		 undo_enable(int, int);
int		 undo_add_boundary(int, int);
void		 undo_add_modified(void);
int		 undo_add_insert(struct line *, int, int);
int		 undo_add_delete(struct line *, int, int, int);
int		 undo_boundary_enable(int, int);
int		 undo_add_change(struct line *, int, int);
int		 undo(int, int);

/* autoexec.c X */
int		 auto_execute(int, int);
PF		*find_autoexec(const char *);
int		 add_autoexec(const char *, const char *);

/* mail.c X */
void		 mail_init(void);
/* cmode.c X */
int		 cmode(int, int);
int		 cc_brace(int, int);
int		 cc_char(int, int);
int		 cc_tab(int, int);
int		 cc_indent(int, int);
int		 cc_lfindent(int, int);

/* grep.c X */
int		 next_error(int, int);
int		 globalwdtoggle(int, int);
int		 compile(int, int);

/*
 * Externals.
 */
extern struct buffer	*bheadp;
extern struct buffer	*curbp;
extern struct mgwin	*curwp;
extern struct mgwin	*wheadp;
extern int		 thisflag;
extern int		 lastflag;
extern int		 curgoal;
extern int		 startrow;
extern int		 epresf;
extern int		 sgarbf;
extern int		 mode;
extern int		 nrow;
extern int		 ncol;
extern int		 ttrow;
extern int		 ttcol;
extern int		 tttop;
extern int		 ttbot;
extern int		 tthue;
extern int		 defb_nmodes;
extern int		 defb_flag;
extern const char	 cinfo[];
extern char		*keystrings[];
extern char		 pat[NPAT];
#ifndef NO_DPROMPT
extern char		 prompt[];
#endif	/* !NO_DPROMPT */

/*
 * Globals.
 */
int		 tceeol;
int		 tcinsl;
int		 tcdell;
int		 rptcount;	/* successive invocation count */