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editline.c

/*  Copyright 1992 Simmule Turner and Rich Salz.  All rights reserved. 
 *
 *  This software is not subject to any license of the American Telephone 
 *  and Telegraph Company or of the Regents of the University of California. 
 *
 *  Permission is granted to anyone to use this software for any purpose on
 *  any computer system, and to alter it and redistribute it freely, subject
 *  to the following restrictions:
 *  1. The authors are not responsible for the consequences of use of this
 *     software, no matter how awful, even if they arise from flaws in it.
 *  2. The origin of this software must not be misrepresented, either by
 *     explicit claim or by omission.  Since few users ever read sources,
 *     credits must appear in the documentation.
 *  3. Altered versions must be plainly marked as such, and must not be
 *     misrepresented as being the original software.  Since few users
 *     ever read sources, credits must appear in the documentation.
 *  4. This notice may not be removed or altered.
 */

/*
**  Main editing routines for editline library.
*/
#include <config.h>
#include "editline.h"
#include <ctype.h>
#include <errno.h>

RCSID("$Id: editline.c,v 1.10 2001/09/13 01:19:54 assar Exp $");

/*
**  Manifest constants.
*/
#define SCREEN_WIDTH    80
#define SCREEN_ROWS     24
#define NO_ARG          (-1)
#define DEL       127
#define CTL(x)          ((x) & 0x1F)
#define ISCTL(x)  ((x) && (x) < ' ')
#define UNCTL(x)  ((x) + 64)
#define META(x)         ((x) | 0x80)
#define ISMETA(x) ((x) & 0x80)
#define UNMETA(x) ((x) & 0x7F)
#if   !defined(HIST_SIZE)
#define HIST_SIZE 20
#endif      /* !defined(HIST_SIZE) */

/*
**  Command status codes.
*/
typedef enum _el_STATUS {
    CSdone, CSeof, CSmove, CSdispatch, CSstay
} el_STATUS;

/*
**  The type of case-changing to perform.
*/
typedef enum _CASE {
    TOupper, TOlower
} CASE;

/*
**  Key to command mapping.
*/
typedef struct _KEYMAP {
    unsigned char Key;
    el_STATUS     (*Function)();
} KEYMAP;

/*
**  Command history structure.
*/
typedef struct _HISTORY {
    int           Size;
    int           Pos;
    unsigned char *Lines[HIST_SIZE];
} HISTORY;

/*
**  Globals.
*/
int         rl_eof;
int         rl_erase;
int         rl_intr;
int         rl_kill;

static unsigned char          NIL[] = "";
static const unsigned char    *Input = NIL;
static unsigned char          *Line;
static const char *Prompt;
static unsigned char          *Yanked;
static char       *Screen;
static char       NEWLINE[]= CRLF;
static HISTORY          H;
int         rl_quit;
static int        Repeat;
static int        End;
static int        Mark;
static int        OldPoint;
static int        Point;
static int        PushBack;
static int        Pushed;
static KEYMAP           Map[33];
static KEYMAP           MetaMap[16];
static size_t           Length;
static size_t           ScreenCount;
static size_t           ScreenSize;
static char       *backspace;
static int        TTYwidth;
static int        TTYrows;

/* Display print 8-bit chars as `M-x' or as the actual 8-bit char? */
int         rl_meta_chars = 1;

/*
**  Declarations.
*/
static unsigned char    *editinput(void);
char  *tgetstr(const char*, char**);
int   tgetent(char*, const char*);
int   tgetnum(const char*);

/*
**  TTY input/output functions.
*/

static void
TTYflush()
{
    if (ScreenCount) {
      write(1, Screen, ScreenCount);
      ScreenCount = 0;
    }
}

static void
TTYput(unsigned char c)
{
    Screen[ScreenCount] = c;
    if (++ScreenCount >= ScreenSize - 1) {
      ScreenSize += SCREEN_INC;
      Screen = realloc(Screen, ScreenSize);
    }
}

static void
TTYputs(const char *p)
{
    while (*p)
      TTYput(*p++);
}

static void
TTYshow(unsigned char c)
{
    if (c == DEL) {
      TTYput('^');
      TTYput('?');
    }
    else if (ISCTL(c)) {
      TTYput('^');
      TTYput(UNCTL(c));
    }
    else if (rl_meta_chars && ISMETA(c)) {
      TTYput('M');
      TTYput('-');
      TTYput(UNMETA(c));
    }
    else
      TTYput(c);
}

static void
TTYstring(unsigned char *p)
{
    while (*p)
      TTYshow(*p++);
}

static int
TTYget()
{
    char c;
    int e;

    TTYflush();
    if (Pushed) {
      Pushed = 0;
      return PushBack;
    }
    if (*Input)
      return *Input++;
    do {
      e = read(0, &c, 1);
    } while(e < 0 && errno == EINTR);
    if(e == 1)
      return c;
    return EOF;
}

static void
TTYback(void)
{
    if (backspace)
      TTYputs(backspace);
    else
      TTYput('\b');
}

static void
TTYbackn(int n)
{
    while (--n >= 0)
      TTYback();
}

static void
TTYinfo()
{
    static int          init;
    char          *term;
    char          buff[2048];
    char          *bp;
    char          *tmp;
#if   defined(TIOCGWINSZ)
    struct winsize      W;
#endif      /* defined(TIOCGWINSZ) */

    if (init) {
#if   defined(TIOCGWINSZ)
      /* Perhaps we got resized. */
      if (ioctl(0, TIOCGWINSZ, &W) >= 0
       && W.ws_col > 0 && W.ws_row > 0) {
          TTYwidth = (int)W.ws_col;
          TTYrows = (int)W.ws_row;
      }
#endif      /* defined(TIOCGWINSZ) */
      return;
    }
    init++;

    TTYwidth = TTYrows = 0;
    bp = &buff[0];
    if ((term = getenv("TERM")) == NULL)
      term = "dumb";
    if (tgetent(buff, term) < 0) {
       TTYwidth = SCREEN_WIDTH;
       TTYrows = SCREEN_ROWS;
       return;
    }
    tmp = tgetstr("le", &bp);
    if (tmp != NULL)
      backspace = strdup(tmp);
    else
      backspace = "\b";
    TTYwidth = tgetnum("co");
    TTYrows = tgetnum("li");

#if   defined(TIOCGWINSZ)
    if (ioctl(0, TIOCGWINSZ, &W) >= 0) {
      TTYwidth = (int)W.ws_col;
      TTYrows = (int)W.ws_row;
    }
#endif      /* defined(TIOCGWINSZ) */

    if (TTYwidth <= 0 || TTYrows <= 0) {
      TTYwidth = SCREEN_WIDTH;
      TTYrows = SCREEN_ROWS;
    }
}


/*
**  Print an array of words in columns.
*/
static void
columns(int ac, unsigned char **av)
{
    unsigned char *p;
    int           i;
    int           j;
    int           k;
    int           len;
    int           skip;
    int           longest;
    int           cols;

    /* Find longest name, determine column count from that. */
    for (longest = 0, i = 0; i < ac; i++)
      if ((j = strlen((char *)av[i])) > longest)
          longest = j;
    cols = TTYwidth / (longest + 3);

    TTYputs(NEWLINE);
    for (skip = ac / cols + 1, i = 0; i < skip; i++) {
      for (j = i; j < ac; j += skip) {
          for (p = av[j], len = strlen((char *)p), k = len; --k >= 0; p++)
            TTYput(*p);
          if (j + skip < ac)
            while (++len < longest + 3)
                TTYput(' ');
      }
      TTYputs(NEWLINE);
    }
}

static void
reposition()
{
    int           i;
    unsigned char *p;

    TTYput('\r');
    TTYputs(Prompt);
    for (i = Point, p = Line; --i >= 0; p++)
      TTYshow(*p);
}

static void
left(el_STATUS Change)
{
    TTYback();
    if (Point) {
      if (ISCTL(Line[Point - 1]))
          TTYback();
        else if (rl_meta_chars && ISMETA(Line[Point - 1])) {
          TTYback();
          TTYback();
      }
    }
    if (Change == CSmove)
      Point--;
}

static void
right(el_STATUS Change)
{
    TTYshow(Line[Point]);
    if (Change == CSmove)
      Point++;
}

static el_STATUS
ring_bell()
{
    TTYput('\07');
    TTYflush();
    return CSstay;
}

static el_STATUS
do_macro(unsigned char c)
{
    unsigned char       name[4];

    name[0] = '_';
    name[1] = c;
    name[2] = '_';
    name[3] = '\0';

    if ((Input = (unsigned char *)getenv((char *)name)) == NULL) {
      Input = NIL;
      return ring_bell();
    }
    return CSstay;
}

static el_STATUS
do_forward(el_STATUS move)
{
    int           i;
    unsigned char *p;

    i = 0;
    do {
      p = &Line[Point];
      for ( ; Point < End && (*p == ' ' || !isalnum(*p)); Point++, p++)
          if (move == CSmove)
            right(CSstay);

      for (; Point < End && isalnum(*p); Point++, p++)
          if (move == CSmove)
            right(CSstay);

      if (Point == End)
          break;
    } while (++i < Repeat);

    return CSstay;
}

static el_STATUS
do_case(CASE type)
{
    int           i;
    int           end;
    int           count;
    unsigned char *p;

    do_forward(CSstay);
    if (OldPoint != Point) {
      if ((count = Point - OldPoint) < 0)
          count = -count;
      Point = OldPoint;
      if ((end = Point + count) > End)
          end = End;
      for (i = Point, p = &Line[i]; i < end; i++, p++) {
          if (type == TOupper) {
            if (islower(*p))
                *p = toupper(*p);
          }
          else if (isupper(*p))
            *p = tolower(*p);
          right(CSmove);
      }
    }
    return CSstay;
}

static el_STATUS
case_down_word()
{
    return do_case(TOlower);
}

static el_STATUS
case_up_word()
{
    return do_case(TOupper);
}

static void
ceol()
{
    int           extras;
    int           i;
    unsigned char *p;

    for (extras = 0, i = Point, p = &Line[i]; i <= End; i++, p++) {
      TTYput(' ');
      if (ISCTL(*p)) {
          TTYput(' ');
          extras++;
      }
      else if (rl_meta_chars && ISMETA(*p)) {
          TTYput(' ');
          TTYput(' ');
          extras += 2;
      }
    }

    for (i += extras; i > Point; i--)
      TTYback();
}

static void
clear_line()
{
    Point = -strlen(Prompt);
    TTYput('\r');
    ceol();
    Point = 0;
    End = 0;
    Line[0] = '\0';
}

static el_STATUS
insert_string(unsigned char *p)
{
    size_t  len;
    int           i;
    unsigned char *new;
    unsigned char *q;

    len = strlen((char *)p);
    if (End + len >= Length) {
      if ((new = malloc(sizeof(unsigned char) * (Length + len + MEM_INC))) == NULL)
          return CSstay;
      if (Length) {
          memcpy(new, Line, Length);
          free(Line);
      }
      Line = new;
      Length += len + MEM_INC;
    }

    for (q = &Line[Point], i = End - Point; --i >= 0; )
      q[len + i] = q[i];
    memcpy(&Line[Point], p, len);
    End += len;
    Line[End] = '\0';
    TTYstring(&Line[Point]);
    Point += len;

    return Point == End ? CSstay : CSmove;
}


static unsigned char *
next_hist()
{
    return H.Pos >= H.Size - 1 ? NULL : H.Lines[++H.Pos];
}

static unsigned char *
prev_hist()
{
    return H.Pos == 0 ? NULL : H.Lines[--H.Pos];
}

static el_STATUS
do_insert_hist(unsigned char *p)
{
    if (p == NULL)
      return ring_bell();
    Point = 0;
    reposition();
    ceol();
    End = 0;
    return insert_string(p);
}

static el_STATUS
do_hist(unsigned char *(*move)())
{
    unsigned char *p;
    int           i;

    i = 0;
    do {
      if ((p = (*move)()) == NULL)
          return ring_bell();
    } while (++i < Repeat);
    return do_insert_hist(p);
}

static el_STATUS
h_next()
{
    return do_hist(next_hist);
}

static el_STATUS
h_prev()
{
    return do_hist(prev_hist);
}

static el_STATUS
h_first()
{
    return do_insert_hist(H.Lines[H.Pos = 0]);
}

static el_STATUS
h_last()
{
    return do_insert_hist(H.Lines[H.Pos = H.Size - 1]);
}

/*
**  Return zero if pat appears as a substring in text.
*/
static int
substrcmp(char *text, char *pat, int len)
{
    unsigned char c;

    if ((c = *pat) == '\0')
        return *text == '\0';
    for ( ; *text; text++)
        if (*text == c && strncmp(text, pat, len) == 0)
            return 0;
    return 1;
}

static unsigned char *
search_hist(unsigned char *search, unsigned char *(*move)())
{
    static unsigned char      *old_search;
    int           len;
    int           pos;
    int           (*match)();
    char    *pat;

    /* Save or get remembered search pattern. */
    if (search && *search) {
      if (old_search)
          free(old_search);
      old_search = (unsigned char *)strdup((char *)search);
    }
    else {
      if (old_search == NULL || *old_search == '\0')
            return NULL;
      search = old_search;
    }

    /* Set up pattern-finder. */
    if (*search == '^') {
      match = strncmp;
      pat = (char *)(search + 1);
    }
    else {
      match = substrcmp;
      pat = (char *)search;
    }
    len = strlen(pat);

    for (pos = H.Pos; (*move)() != NULL; )
      if ((*match)((char *)H.Lines[H.Pos], pat, len) == 0)
            return H.Lines[H.Pos];
    H.Pos = pos;
    return NULL;
}

static el_STATUS
h_search()
{
    static int    Searching;
    const char    *old_prompt;
    unsigned char *(*move)();
    unsigned char *p;

    if (Searching)
      return ring_bell();
    Searching = 1;

    clear_line();
    old_prompt = Prompt;
    Prompt = "Search: ";
    TTYputs(Prompt);
    move = Repeat == NO_ARG ? prev_hist : next_hist;
    p = search_hist(editinput(), move);
    clear_line();
    Prompt = old_prompt;
    TTYputs(Prompt);

    Searching = 0;
    return do_insert_hist(p);
}

static el_STATUS
fd_char()
{
    int           i;

    i = 0;
    do {
      if (Point >= End)
          break;
      right(CSmove);
    } while (++i < Repeat);
    return CSstay;
}

static void
save_yank(int begin, int i)
{
    if (Yanked) {
      free(Yanked);
      Yanked = NULL;
    }

    if (i < 1)
      return;

    if ((Yanked = malloc(sizeof(unsigned char) * (i + 1))) != NULL) {
      memcpy(Yanked, &Line[begin], i);
      Yanked[i+1] = '\0';
    }
}

static el_STATUS
delete_string(int count)
{
    int           i;
    unsigned char *p;

    if (count <= 0 || End == Point)
      return ring_bell();

    if (count == 1 && Point == End - 1) {
      /* Optimize common case of delete at end of line. */
      End--;
      p = &Line[Point];
      i = 1;
      TTYput(' ');
      if (ISCTL(*p)) {
          i = 2;
          TTYput(' ');
      }
      else if (rl_meta_chars && ISMETA(*p)) {
          i = 3;
          TTYput(' ');
          TTYput(' ');
      }
      TTYbackn(i);
      *p = '\0';
      return CSmove;
    }
    if (Point + count > End && (count = End - Point) <= 0)
      return CSstay;

    if (count > 1)
      save_yank(Point, count);

    for (p = &Line[Point], i = End - (Point + count) + 1; --i >= 0; p++)
      p[0] = p[count];
    ceol();
    End -= count;
    TTYstring(&Line[Point]);
    return CSmove;
}

static el_STATUS
bk_char()
{
    int           i;

    i = 0;
    do {
      if (Point == 0)
          break;
      left(CSmove);
    } while (++i < Repeat);

    return CSstay;
}

static el_STATUS
bk_del_char()
{
    int           i;

    i = 0;
    do {
      if (Point == 0)
          break;
      left(CSmove);
    } while (++i < Repeat);

    return delete_string(i);
}

static el_STATUS
redisplay()
{
    TTYputs(NEWLINE);
    TTYputs(Prompt);
    TTYstring(Line);
    return CSmove;
}

static el_STATUS
kill_line()
{
    int           i;

    if (Repeat != NO_ARG) {
      if (Repeat < Point) {
          i = Point;
          Point = Repeat;
          reposition();
          delete_string(i - Point);
      }
      else if (Repeat > Point) {
          right(CSmove);
          delete_string(Repeat - Point - 1);
      }
      return CSmove;
    }

    save_yank(Point, End - Point);
    Line[Point] = '\0';
    ceol();
    End = Point;
    return CSstay;
}

static el_STATUS
insert_char(int c)
{
    el_STATUS     s;
    unsigned char buff[2];
    unsigned char *p;
    unsigned char *q;
    int           i;

    if (Repeat == NO_ARG || Repeat < 2) {
      buff[0] = c;
      buff[1] = '\0';
      return insert_string(buff);
    }

    if ((p = malloc(Repeat + 1)) == NULL)
      return CSstay;
    for (i = Repeat, q = p; --i >= 0; )
      *q++ = c;
    *q = '\0';
    Repeat = 0;
    s = insert_string(p);
    free(p);
    return s;
}

static el_STATUS
meta()
{
    unsigned int  c;
    KEYMAP        *kp;

    if ((c = TTYget()) == EOF)
      return CSeof;
    /* Also include VT-100 arrows. */
    if (c == '[' || c == 'O')
      switch (c = TTYget()) {
      default:    return ring_bell();
      case EOF:   return CSeof;
      case 'A':   return h_prev();
      case 'B':   return h_next();
      case 'C':   return fd_char();
      case 'D':   return bk_char();
      }

    if (isdigit(c)) {
      for (Repeat = c - '0'; (c = TTYget()) != EOF && isdigit(c); )
          Repeat = Repeat * 10 + c - '0';
      Pushed = 1;
      PushBack = c;
      return CSstay;
    }

    if (isupper(c))
      return do_macro(c);
    for (OldPoint = Point, kp = MetaMap; kp->Function; kp++)
      if (kp->Key == c)
          return (*kp->Function)();

    return ring_bell();
}

static el_STATUS
emacs(unsigned int c)
{
    el_STATUS           s;
    KEYMAP        *kp;

    if (ISMETA(c)) {
      Pushed = 1;
      PushBack = UNMETA(c);
      return meta();
    }
    for (kp = Map; kp->Function; kp++)
      if (kp->Key == c)
          break;
    s = kp->Function ? (*kp->Function)() : insert_char((int)c);
    if (!Pushed)
      /* No pushback means no repeat count; hacky, but true. */
      Repeat = NO_ARG;
    return s;
}

static el_STATUS
TTYspecial(unsigned int c)
{
    if (ISMETA(c))
      return CSdispatch;

    if (c == rl_erase || c == DEL)
      return bk_del_char();
    if (c == rl_kill) {
      if (Point != 0) {
          Point = 0;
          reposition();
      }
      Repeat = NO_ARG;
      return kill_line();
    }
    if (c == rl_intr || c == rl_quit) {
      Point = End = 0;
      Line[0] = '\0';
      return redisplay();
    }
    if (c == rl_eof && Point == 0 && End == 0)
      return CSeof;

    return CSdispatch;
}

static unsigned char *
editinput()
{
    unsigned int  c;

    Repeat = NO_ARG;
    OldPoint = Point = Mark = End = 0;
    Line[0] = '\0';

    while ((c = TTYget()) != EOF)
      switch (TTYspecial(c)) {
      case CSdone:
          return Line;
      case CSeof:
          return NULL;
      case CSmove:
          reposition();
          break;
      case CSdispatch:
          switch (emacs(c)) {
          case CSdone:
            return Line;
          case CSeof:
            return NULL;
          case CSmove:
            reposition();
            break;
          case CSdispatch:
          case CSstay:
            break;
          }
          break;
      case CSstay:
          break;
      }
    return NULL;
}

static void
hist_add(unsigned char *p)
{
    int           i;

    if ((p = (unsigned char *)strdup((char *)p)) == NULL)
      return;
    if (H.Size < HIST_SIZE)
      H.Lines[H.Size++] = p;
    else {
      free(H.Lines[0]);
      for (i = 0; i < HIST_SIZE - 1; i++)
          H.Lines[i] = H.Lines[i + 1];
      H.Lines[i] = p;
    }
    H.Pos = H.Size - 1;
}

/*
**  For compatibility with FSF readline.
*/
/* ARGSUSED0 */
void
rl_reset_terminal(char *p)
{
}

void
rl_initialize(void)
{
}

char *
readline(const char* prompt)
{
    unsigned char *line;

    if (Line == NULL) {
      Length = MEM_INC;
      if ((Line = malloc(Length)) == NULL)
          return NULL;
    }

    TTYinfo();
    rl_ttyset(0);
    hist_add(NIL);
    ScreenSize = SCREEN_INC;
    Screen = malloc(ScreenSize);
    Prompt = prompt ? prompt : (char *)NIL;
    TTYputs(Prompt);
    if ((line = editinput()) != NULL) {
      line = (unsigned char *)strdup((char *)line);
      TTYputs(NEWLINE);
      TTYflush();
    }
    rl_ttyset(1);
    free(Screen);
    free(H.Lines[--H.Size]);
    return (char *)line;
}

void
add_history(char *p)
{
    if (p == NULL || *p == '\0')
      return;

#if   defined(UNIQUE_HISTORY)
    if (H.Pos && strcmp(p, H.Lines[H.Pos - 1]) == 0)
        return;
#endif      /* defined(UNIQUE_HISTORY) */
    hist_add((unsigned char *)p);
}


static el_STATUS
beg_line()
{
    if (Point) {
      Point = 0;
      return CSmove;
    }
    return CSstay;
}

static el_STATUS
del_char()
{
    return delete_string(Repeat == NO_ARG ? 1 : Repeat);
}

static el_STATUS
end_line()
{
    if (Point != End) {
      Point = End;
      return CSmove;
    }
    return CSstay;
}

/*
**  Move back to the beginning of the current word and return an
**  allocated copy of it.
*/
static unsigned char *
find_word()
{
    static char   SEPS[] = "#;&|^$=`'{}()<>\n\t ";
    unsigned char *p;
    unsigned char *new;
    size_t  len;

    for (p = &Line[Point]; p > Line && strchr(SEPS, (char)p[-1]) == NULL; p--)
      continue;
    len = Point - (p - Line) + 1;
    if ((new = malloc(len)) == NULL)
      return NULL;
    memcpy(new, p, len);
    new[len - 1] = '\0';
    return new;
}

static el_STATUS
c_complete()
{
    unsigned char *p;
    unsigned char *word;
    int           unique;
    el_STATUS     s;

    word = find_word();
    p = (unsigned char *)rl_complete((char *)word, &unique);
    if (word)
      free(word);
    if (p && *p) {
      s = insert_string(p);
      if (!unique)
          ring_bell();
      free(p);
      return s;
    }
    return ring_bell();
}

static el_STATUS
c_possible()
{
    unsigned char **av;
    unsigned char *word;
    int           ac;

    word = find_word();
    ac = rl_list_possib((char *)word, (char ***)&av);
    if (word)
      free(word);
    if (ac) {
      columns(ac, av);
      while (--ac >= 0)
          free(av[ac]);
      free(av);
      return CSmove;
    }
    return ring_bell();
}

static el_STATUS
accept_line()
{
    Line[End] = '\0';
    return CSdone;
}

static el_STATUS
transpose()
{
    unsigned char c;

    if (Point) {
      if (Point == End)
          left(CSmove);
      c = Line[Point - 1];
      left(CSstay);
      Line[Point - 1] = Line[Point];
      TTYshow(Line[Point - 1]);
      Line[Point++] = c;
      TTYshow(c);
    }
    return CSstay;
}

static el_STATUS
quote()
{
    unsigned int  c;

    return (c = TTYget()) == EOF ? CSeof : insert_char((int)c);
}

static el_STATUS
wipe()
{
    int           i;

    if (Mark > End)
      return ring_bell();

    if (Point > Mark) {
      i = Point;
      Point = Mark;
      Mark = i;
      reposition();
    }

    return delete_string(Mark - Point);
}

static el_STATUS
mk_set()
{
    Mark = Point;
    return CSstay;
}

static el_STATUS
exchange()
{
    unsigned int  c;

    if ((c = TTYget()) != CTL('X'))
      return c == EOF ? CSeof : ring_bell();

    if ((c = Mark) <= End) {
      Mark = Point;
      Point = c;
      return CSmove;
    }
    return CSstay;
}

static el_STATUS
yank()
{
    if (Yanked && *Yanked)
      return insert_string(Yanked);
    return CSstay;
}

static el_STATUS
copy_region()
{
    if (Mark > End)
      return ring_bell();

    if (Point > Mark)
      save_yank(Mark, Point - Mark);
    else
      save_yank(Point, Mark - Point);

    return CSstay;
}

static el_STATUS
move_to_char()
{
    unsigned int  c;
    int                 i;
    unsigned char       *p;

    if ((c = TTYget()) == EOF)
      return CSeof;
    for (i = Point + 1, p = &Line[i]; i < End; i++, p++)
      if (*p == c) {
          Point = i;
          return CSmove;
      }
    return CSstay;
}

static el_STATUS
fd_word()
{
    return do_forward(CSmove);
}

static el_STATUS
fd_kill_word()
{
    int           i;

    do_forward(CSstay);
    if (OldPoint != Point) {
      i = Point - OldPoint;
      Point = OldPoint;
      return delete_string(i);
    }
    return CSstay;
}

static el_STATUS
bk_word()
{
    int           i;
    unsigned char *p;

    i = 0;
    do {
      for (p = &Line[Point]; p > Line && !isalnum(p[-1]); p--)
          left(CSmove);

      for (; p > Line && p[-1] != ' ' && isalnum(p[-1]); p--)
          left(CSmove);

      if (Point == 0)
          break;
    } while (++i < Repeat);

    return CSstay;
}

static el_STATUS
bk_kill_word()
{
    bk_word();
    if (OldPoint != Point)
      return delete_string(OldPoint - Point);
    return CSstay;
}

static int
argify(unsigned char *line, unsigned char ***avp)
{
    unsigned char *c;
    unsigned char **p;
    unsigned char **new;
    int           ac;
    int           i;

    i = MEM_INC;
    if ((*avp = p = malloc(sizeof(unsigned char*) * i))== NULL)
       return 0;

    for (c = line; isspace(*c); c++)
      continue;
    if (*c == '\n' || *c == '\0')
      return 0;

    for (ac = 0, p[ac++] = c; *c && *c != '\n'; ) {
      if (isspace(*c)) {
          *c++ = '\0';
          if (*c && *c != '\n') {
            if (ac + 1 == i) {
                new = malloc(sizeof(unsigned char*) * (i + MEM_INC));
                if (new == NULL) {
                  p[ac] = NULL;
                  return ac;
                }
                memcpy(new, p, i * sizeof (char **));
                i += MEM_INC;
                free(p);
                *avp = p = new;
            }
            p[ac++] = c;
          }
      }
      else
          c++;
    }
    *c = '\0';
    p[ac] = NULL;
    return ac;
}

static el_STATUS
last_argument()
{
    unsigned char **av;
    unsigned char *p;
    el_STATUS     s;
    int           ac;

    if (H.Size == 1 || (p = H.Lines[H.Size - 2]) == NULL)
      return ring_bell();

    if ((p = (unsigned char *)strdup((char *)p)) == NULL)
      return CSstay;
    ac = argify(p, &av);

    if (Repeat != NO_ARG)
      s = Repeat < ac ? insert_string(av[Repeat]) : ring_bell();
    else
      s = ac ? insert_string(av[ac - 1]) : CSstay;

    if (ac)
      free(av);
    free(p);
    return s;
}

static KEYMAP     Map[33] = {
    { CTL('@'),   ring_bell   },
    { CTL('A'),   beg_line    },
    { CTL('B'),   bk_char           },
    { CTL('D'),   del_char    },
    { CTL('E'),   end_line    },
    { CTL('F'),   fd_char           },
    { CTL('G'),   ring_bell   },
    { CTL('H'),   bk_del_char },
    { CTL('I'),   c_complete  },
    { CTL('J'),   accept_line },
    { CTL('K'),   kill_line   },
    { CTL('L'),   redisplay   },
    { CTL('M'),   accept_line },
    { CTL('N'),   h_next            },
    { CTL('O'),   ring_bell   },
    { CTL('P'),   h_prev            },
    { CTL('Q'),   ring_bell   },
    { CTL('R'),   h_search    },
    { CTL('S'),   ring_bell   },
    { CTL('T'),   transpose   },
    { CTL('U'),   ring_bell   },
    { CTL('V'),   quote       },
    { CTL('W'),   wipe        },
    { CTL('X'),   exchange    },
    { CTL('Y'),   yank        },
    { CTL('Z'),   ring_bell   },
    { CTL('['),   meta        },
    { CTL(']'),   move_to_char      },
    { CTL('^'),   ring_bell   },
    { CTL('_'),   ring_bell   },
    { 0,          NULL        }
};

static KEYMAP     MetaMap[16]= {
    { CTL('H'),   bk_kill_word      },
    { DEL,        bk_kill_word      },
    { ' ',        mk_set      },
    { '.',        last_argument     },
    { '<',        h_first           },
    { '>',        h_last            },
    { '?',        c_possible  },
    { 'b',        bk_word           },
    { 'd',        fd_kill_word      },
    { 'f',        fd_word           },
    { 'l',        case_down_word    },
    { 'u',        case_up_word      },
    { 'y',        yank        },
    { 'w',        copy_region },
    { 0,          NULL        }
};

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