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vi.c
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/* $OpenBSD: vi.c,v 1.26 2009/06/29 22:50:19 martynas Exp $ */
/*
* vi command editing
* written by John Rochester (initially for nsh)
* bludgeoned to fit pdksh by Larry Bouzane, Jeff Sparkes & Eric Gisin
*
*/
#include "config.h"
#ifdef VI
#include "sh.h"
#include <ctype.h>
#include <sys/stat.h> /* completion */
#include "edit.h"
#define CMDLEN 2048
#define Ctrl(c) (c&0x1f)
#define is_wordch(c) (letnum(c))
struct edstate {
int winleft;
char *cbuf;
int cbufsize;
int linelen;
int cursor;
};
static int vi_hook(int);
static void vi_reset(char *, size_t);
static int nextstate(int);
static int vi_insert(int);
static int vi_cmd(int, const char *);
static int domove(int, const char *, int);
static int redo_insert(int);
static void yank_range(int, int);
static int bracktype(int);
static void save_cbuf(void);
static void restore_cbuf(void);
static void edit_reset(char *, size_t);
static int putbuf(const char *, int, int);
static void del_range(int, int);
static int findch(int, int, int, int);
static int forwword(int);
static int backword(int);
static int endword(int);
static int Forwword(int);
static int Backword(int);
static int Endword(int);
static int grabhist(int, int);
static int grabsearch(int, int, int, char *);
static void redraw_line(int);
static void refresh(int);
static int outofwin(void);
static void rewindow(void);
static int newcol(int, int);
static void display(char *, char *, int);
static void ed_mov_opt(int, char *);
static int expand_word(int);
static int complete_word(int, int);
static int print_expansions(struct edstate *, int);
static int char_len(int);
static void x_vi_zotc(int);
static void vi_pprompt(int);
static void vi_error(void);
static void vi_macro_reset(void);
static int x_vi_putbuf(const char *, size_t);
#define C_ 0x1 /* a valid command that isn't a M_, E_, U_ */
#define M_ 0x2 /* movement command (h, l, etc.) */
#define E_ 0x4 /* extended command (c, d, y) */
#define X_ 0x8 /* long command (@, f, F, t, T, etc.) */
#define U_ 0x10 /* an UN-undoable command (that isn't a M_) */
#define B_ 0x20 /* bad command (^@) */
#define Z_ 0x40 /* repeat count defaults to 0 (not 1) */
#define S_ 0x80 /* search (/, ?) */
#define is_bad(c) (classify[(c)&0x7f]&B_)
#define is_cmd(c) (classify[(c)&0x7f]&(M_|E_|C_|U_))
#define is_move(c) (classify[(c)&0x7f]&M_)
#define is_extend(c) (classify[(c)&0x7f]&E_)
#define is_long(c) (classify[(c)&0x7f]&X_)
#define is_undoable(c) (!(classify[(c)&0x7f]&U_))
#define is_srch(c) (classify[(c)&0x7f]&S_)
#define is_zerocount(c) (classify[(c)&0x7f]&Z_)
const unsigned char classify[128] = {
/* 0 1 2 3 4 5 6 7 */
/* 0 ^@ ^A ^B ^C ^D ^E ^F ^G */
B_, 0, 0, 0, 0, C_|U_, C_|Z_, 0,
/* 01 ^H ^I ^J ^K ^L ^M ^N ^O */
M_, C_|Z_, 0, 0, C_|U_, 0, C_, 0,
/* 02 ^P ^Q ^R ^S ^T ^U ^V ^W */
C_, 0, C_|U_, 0, 0, 0, C_, 0,
/* 03 ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */
C_, 0, 0, C_|Z_, 0, 0, 0, 0,
/* 04 <space> ! " # $ % & ' */
M_, 0, 0, C_, M_, M_, 0, 0,
/* 05 ( ) * + , - . / */
0, 0, C_, C_, M_, C_, 0, C_|S_,
/* 06 0 1 2 3 4 5 6 7 */
M_, 0, 0, 0, 0, 0, 0, 0,
/* 07 8 9 : ; < = > ? */
0, 0, 0, M_, 0, C_, 0, C_|S_,
/* 010 @ A B C D E F G */
C_|X_, C_, M_, C_, C_, M_, M_|X_, C_|U_|Z_,
/* 011 H I J K L M N O */
0, C_, 0, 0, 0, 0, C_|U_, 0,
/* 012 P Q R S T U V W */
C_, 0, C_, C_, M_|X_, C_, 0, M_,
/* 013 X Y Z [ \ ] ^ _ */
C_, C_|U_, 0, 0, C_|Z_, 0, M_, C_|Z_,
/* 014 ` a b c d e f g */
0, C_, M_, E_, E_, M_, M_|X_, C_|Z_,
/* 015 h i j k l m n o */
M_, C_, C_|U_, C_|U_, M_, 0, C_|U_, 0,
/* 016 p q r s t u v w */
C_, 0, X_, C_, M_|X_, C_|U_, C_|U_|Z_,M_,
/* 017 x y z { | } ~ ^? */
C_, E_|U_, 0, 0, M_|Z_, 0, C_, 0
};
#define MAXVICMD 3
#define SRCHLEN 40
#define INSERT 1
#define REPLACE 2
#define VNORMAL 0 /* command, insert or replace mode */
#define VARG1 1 /* digit prefix (first, eg, 5l) */
#define VEXTCMD 2 /* cmd + movement (eg, cl) */
#define VARG2 3 /* digit prefix (second, eg, 2c3l) */
#define VXCH 4 /* f, F, t, T, @ */
#define VFAIL 5 /* bad command */
#define VCMD 6 /* single char command (eg, X) */
#define VREDO 7 /* . */
#define VLIT 8 /* ^V */
#define VSEARCH 9 /* /, ? */
#define VVERSION 10 /* <ESC> ^V */
static char undocbuf[CMDLEN];
static struct edstate *save_edstate(struct edstate *old);
static void restore_edstate(struct edstate *old, struct edstate *new);
static void free_edstate(struct edstate *old);
static struct edstate ebuf;
static struct edstate undobuf = { 0, undocbuf, CMDLEN, 0, 0 };
static struct edstate *es; /* current editor state */
static struct edstate *undo;
static char ibuf[CMDLEN]; /* input buffer */
static int first_insert; /* set when starting in insert mode */
static int saved_inslen; /* saved inslen for first insert */
static int inslen; /* length of input buffer */
static int srchlen; /* length of current search pattern */
static char ybuf[CMDLEN]; /* yank buffer */
static int yanklen; /* length of yank buffer */
static int fsavecmd = ' '; /* last find command */
static int fsavech; /* character to find */
static char lastcmd[MAXVICMD]; /* last non-move command */
static int lastac; /* argcnt for lastcmd */
static int lastsearch = ' '; /* last search command */
static char srchpat[SRCHLEN]; /* last search pattern */
static int insert; /* non-zero in insert mode */
static int hnum; /* position in history */
static int ohnum; /* history line copied (after mod) */
static int hlast; /* 1 past last position in history */
static int modified; /* buffer has been "modified" */
static int state;
/* Information for keeping track of macros that are being expanded.
* The format of buf is the alias contents followed by a null byte followed
* by the name (letter) of the alias. The end of the buffer is marked by
* a double null. The name of the alias is stored so recursive macros can
* be detected.
*/
struct macro_state {
unsigned char *p; /* current position in buf */
unsigned char *buf; /* pointer to macro(s) being expanded */
int len; /* how much data in buffer */
};
static struct macro_state macro;
enum expand_mode { NONE, EXPAND, COMPLETE, PRINT };
static enum expand_mode expanded = NONE;/* last input was expanded */
int
x_vi(char *buf, size_t len)
{
int c;
vi_reset(buf, len > CMDLEN ? CMDLEN : len);
vi_pprompt(1);
x_flush();
while (1) {
if (macro.p) {
c = *macro.p++;
/* end of current macro? */
if (!c) {
/* more macros left to finish? */
if (*macro.p++)
continue;
/* must be the end of all the macros */
vi_macro_reset();
c = x_getc();
}
} else
c = x_getc();
if (c == -1)
break;
if (state != VLIT) {
if (c == edchars.intr || c == edchars.quit) {
/* pretend we got an interrupt */
x_vi_zotc(c);
x_flush();
trapsig(c == edchars.intr ? SIGINT : SIGQUIT);
x_mode(false);
unwind(LSHELL);
} else if (c == edchars.eof && state != VVERSION) {
if (es->linelen == 0) {
x_vi_zotc(edchars.eof);
c = -1;
break;
}
continue;
}
}
if (vi_hook(c))
break;
x_flush();
}
x_putc('\r'); x_putc('\n'); x_flush();
if (c == -1 || len <= es->linelen)
return -1;
if (es->cbuf != buf)
memmove(buf, es->cbuf, es->linelen);
buf[es->linelen++] = '\n';
return es->linelen;
}
static int
vi_hook(int ch)
{
static char curcmd[MAXVICMD], locpat[SRCHLEN];
static int cmdlen, argc1, argc2;
switch (state) {
case VNORMAL:
if (insert != 0) {
if (ch == Ctrl('v')) {
state = VLIT;
ch = '^';
}
switch (vi_insert(ch)) {
case -1:
vi_error();
state = VNORMAL;
break;
case 0:
if (state == VLIT) {
es->cursor--;
refresh(0);
} else
refresh(insert != 0);
break;
case 1:
return 1;
}
} else {
if (ch == '\r' || ch == '\n')
return 1;
cmdlen = 0;
argc1 = 0;
if (ch >= '1' && ch <= '9') {
argc1 = ch - '0';
state = VARG1;
} else {
curcmd[cmdlen++] = ch;
state = nextstate(ch);
if (state == VSEARCH) {
save_cbuf();
es->cursor = 0;
es->linelen = 0;
if (ch == '/') {
if (putbuf("/", 1, 0) != 0)
return -1;
} else if (putbuf("?", 1, 0) != 0)
return -1;
refresh(0);
}
if (state == VVERSION) {
save_cbuf();
es->cursor = 0;
es->linelen = 0;
putbuf(ksh_version + 4,
strlen(ksh_version + 4), 0);
refresh(0);
}
}
}
break;
case VLIT:
if (is_bad(ch)) {
del_range(es->cursor, es->cursor + 1);
vi_error();
} else
es->cbuf[es->cursor++] = ch;
refresh(1);
state = VNORMAL;
break;
case VVERSION:
restore_cbuf();
state = VNORMAL;
refresh(0);
break;
case VARG1:
if (isdigit(ch))
argc1 = argc1 * 10 + ch - '0';
else {
curcmd[cmdlen++] = ch;
state = nextstate(ch);
}
break;
case VEXTCMD:
argc2 = 0;
if (ch >= '1' && ch <= '9') {
argc2 = ch - '0';
state = VARG2;
return 0;
} else {
curcmd[cmdlen++] = ch;
if (ch == curcmd[0])
state = VCMD;
else if (is_move(ch))
state = nextstate(ch);
else
state = VFAIL;
}
break;
case VARG2:
if (isdigit(ch))
argc2 = argc2 * 10 + ch - '0';
else {
if (argc1 == 0)
argc1 = argc2;
else
argc1 *= argc2;
curcmd[cmdlen++] = ch;
if (ch == curcmd[0])
state = VCMD;
else if (is_move(ch))
state = nextstate(ch);
else
state = VFAIL;
}
break;
case VXCH:
if (ch == Ctrl('['))
state = VNORMAL;
else {
curcmd[cmdlen++] = ch;
state = VCMD;
}
break;
case VSEARCH:
if (ch == '\r' || ch == '\n' /*|| ch == Ctrl('[')*/ ) {
restore_cbuf();
/* Repeat last search? */
if (srchlen == 0) {
if (!srchpat[0]) {
vi_error();
state = VNORMAL;
refresh(0);
return 0;
}
} else {
locpat[srchlen] = '\0';
(void) strlcpy(srchpat, locpat, sizeof srchpat);
}
state = VCMD;
} else if (ch == edchars.erase || ch == Ctrl('h')) {
if (srchlen != 0) {
srchlen--;
es->linelen -= char_len((unsigned char)locpat[srchlen]);
es->cursor = es->linelen;
refresh(0);
return 0;
}
restore_cbuf();
state = VNORMAL;
refresh(0);
} else if (ch == edchars.kill) {
srchlen = 0;
es->linelen = 1;
es->cursor = 1;
refresh(0);
return 0;
} else if (ch == edchars.werase) {
struct edstate new_es, *save_es;
int i;
int n = srchlen;
new_es.cursor = n;
new_es.cbuf = locpat;
save_es = es;
es = &new_es;
n = backword(1);
es = save_es;
for (i = srchlen; --i >= n; )
es->linelen -= char_len((unsigned char)locpat[i]);
srchlen = n;
es->cursor = es->linelen;
refresh(0);
return 0;
} else {
if (srchlen == SRCHLEN - 1)
vi_error();
else {
locpat[srchlen++] = ch;
if ((ch & 0x80) && Flag(FVISHOW8)) {
if (es->linelen + 2 > es->cbufsize)
vi_error();
es->cbuf[es->linelen++] = 'M';
es->cbuf[es->linelen++] = '-';
ch &= 0x7f;
}
if (ch < ' ' || ch == 0x7f) {
if (es->linelen + 2 > es->cbufsize)
vi_error();
es->cbuf[es->linelen++] = '^';
es->cbuf[es->linelen++] = ch ^ '@';
} else {
if (es->linelen >= es->cbufsize)
vi_error();
es->cbuf[es->linelen++] = ch;
}
es->cursor = es->linelen;
refresh(0);
}
return 0;
}
break;
}
switch (state) {
case VCMD:
state = VNORMAL;
switch (vi_cmd(argc1, curcmd)) {
case -1:
vi_error();
refresh(0);
break;
case 0:
if (insert != 0)
inslen = 0;
refresh(insert != 0);
break;
case 1:
refresh(0);
return 1;
case 2:
/* back from a 'v' command - don't redraw the screen */
return 1;
}
break;
case VREDO:
state = VNORMAL;
if (argc1 != 0)
lastac = argc1;
switch (vi_cmd(lastac, lastcmd)) {
case -1:
vi_error();
refresh(0);
break;
case 0:
if (insert != 0) {
if (lastcmd[0] == 's' || lastcmd[0] == 'c' ||
lastcmd[0] == 'C') {
if (redo_insert(1) != 0)
vi_error();
} else {
if (redo_insert(lastac) != 0)
vi_error();
}
}
refresh(0);
break;
case 1:
refresh(0);
return 1;
case 2:
/* back from a 'v' command - can't happen */
break;
}
break;
case VFAIL:
state = VNORMAL;
vi_error();
break;
}
return 0;
}
static void
vi_reset(char *buf, size_t len)
{
state = VNORMAL;
ohnum = hnum = hlast = histnum(-1) + 1;
insert = INSERT;
saved_inslen = inslen;
first_insert = 1;
inslen = 0;
modified = 1;
vi_macro_reset();
edit_reset(buf, len);
}
static int
nextstate(int ch)
{
if (is_extend(ch))
return VEXTCMD;
else if (is_srch(ch))
return VSEARCH;
else if (is_long(ch))
return VXCH;
else if (ch == '.')
return VREDO;
else if (ch == Ctrl('v'))
return VVERSION;
else if (is_cmd(ch))
return VCMD;
else
return VFAIL;
}
static int
vi_insert(int ch)
{
int tcursor;
if (ch == edchars.erase || ch == Ctrl('h')) {
if (insert == REPLACE) {
if (es->cursor == undo->cursor) {
vi_error();
return 0;
}
if (inslen > 0)
inslen--;
es->cursor--;
if (es->cursor >= undo->linelen)
es->linelen--;
else
es->cbuf[es->cursor] = undo->cbuf[es->cursor];
} else {
if (es->cursor == 0) {
/* x_putc(BEL); no annoying bell here */
return 0;
}
if (inslen > 0)
inslen--;
es->cursor--;
es->linelen--;
memmove(&es->cbuf[es->cursor], &es->cbuf[es->cursor+1],
es->linelen - es->cursor + 1);
}
expanded = NONE;
return 0;
}
if (ch == edchars.kill) {
if (es->cursor != 0) {
inslen = 0;
memmove(es->cbuf, &es->cbuf[es->cursor],
es->linelen - es->cursor);
es->linelen -= es->cursor;
es->cursor = 0;
}
expanded = NONE;
return 0;
}
if (ch == edchars.werase) {
if (es->cursor != 0) {
tcursor = backword(1);
memmove(&es->cbuf[tcursor], &es->cbuf[es->cursor],
es->linelen - es->cursor);
es->linelen -= es->cursor - tcursor;
if (inslen < es->cursor - tcursor)
inslen = 0;
else
inslen -= es->cursor - tcursor;
es->cursor = tcursor;
}
expanded = NONE;
return 0;
}
/* If any chars are entered before escape, trash the saved insert
* buffer (if user inserts & deletes char, ibuf gets trashed and
* we don't want to use it)
*/
if (first_insert && ch != Ctrl('['))
saved_inslen = 0;
switch (ch) {
case '\0':
return -1;
case '\r':
case '\n':
return 1;
case Ctrl('['):
expanded = NONE;
if (first_insert) {
first_insert = 0;
if (inslen == 0) {
inslen = saved_inslen;
return redo_insert(0);
}
lastcmd[0] = 'a';
lastac = 1;
}
if (lastcmd[0] == 's' || lastcmd[0] == 'c' ||
lastcmd[0] == 'C')
return redo_insert(0);
else
return redo_insert(lastac - 1);
/* { Begin nonstandard vi commands */
case Ctrl('x'):
expand_word(0);
break;
case Ctrl('f'):
complete_word(0, 0);
break;
case Ctrl('e'):
print_expansions(es, 0);
break;
case Ctrl('i'):
if (Flag(FVITABCOMPLETE)) {
complete_word(0, 0);
break;
}
/* FALLTHROUGH */
/* End nonstandard vi commands } */
default:
if (es->linelen >= es->cbufsize - 1)
return -1;
ibuf[inslen++] = ch;
if (insert == INSERT) {
memmove(&es->cbuf[es->cursor+1], &es->cbuf[es->cursor],
es->linelen - es->cursor);
es->linelen++;
}
es->cbuf[es->cursor++] = ch;
if (insert == REPLACE && es->cursor > es->linelen)
es->linelen++;
expanded = NONE;
}
return 0;
}
static int
vi_cmd(int argcnt, const char *cmd)
{
int ncursor;
int cur, c1, c2, c3 = 0;
int any;
struct edstate *t;
if (argcnt == 0 && !is_zerocount(*cmd))
argcnt = 1;
if (is_move(*cmd)) {
if ((cur = domove(argcnt, cmd, 0)) >= 0) {
if (cur == es->linelen && cur != 0)
cur--;
es->cursor = cur;
} else
return -1;
} else {
/* Don't save state in middle of macro.. */
if (is_undoable(*cmd) && !macro.p) {
undo->winleft = es->winleft;
memmove(undo->cbuf, es->cbuf, es->linelen);
undo->linelen = es->linelen;
undo->cursor = es->cursor;
lastac = argcnt;
memmove(lastcmd, cmd, MAXVICMD);
}
switch (*cmd) {
case Ctrl('l'):
case Ctrl('r'):
redraw_line(1);
break;
case '@':
{
static char alias[] = "_\0";
struct tbl *ap;
int olen, nlen;
char *p, *nbuf;
/* lookup letter in alias list... */
alias[1] = cmd[1];
ap = ktsearch(&aliases, alias, hash(alias));
if (!cmd[1] || !ap || !(ap->flag & ISSET))
return -1;
/* check if this is a recursive call... */
if ((p = (char *) macro.p))
while ((p = strchr(p, '\0')) && p[1])
if (*++p == cmd[1])
return -1;
/* insert alias into macro buffer */
nlen = strlen(ap->val.s) + 1;
olen = !macro.p ? 2 :
macro.len - (macro.p - macro.buf);
nbuf = alloc(nlen + 1 + olen, APERM);
memcpy(nbuf, ap->val.s, nlen);
nbuf[nlen++] = cmd[1];
if (macro.p) {
memcpy(nbuf + nlen, macro.p, olen);
afree(macro.buf, APERM);
nlen += olen;
} else {
nbuf[nlen++] = '\0';
nbuf[nlen++] = '\0';
}
macro.p = macro.buf = (unsigned char *) nbuf;
macro.len = nlen;
}
break;
case 'a':
modified = 1; hnum = hlast;
if (es->linelen != 0)
es->cursor++;
insert = INSERT;
break;
case 'A':
modified = 1; hnum = hlast;
del_range(0, 0);
es->cursor = es->linelen;
insert = INSERT;
break;
case 'S':
es->cursor = domove(1, "^", 1);
del_range(es->cursor, es->linelen);
modified = 1; hnum = hlast;
insert = INSERT;
break;
case 'Y':
cmd = "y$";
/* ahhhhhh... */
case 'c':
case 'd':
case 'y':
if (*cmd == cmd[1]) {
c1 = *cmd == 'c' ? domove(1, "^", 1) : 0;
c2 = es->linelen;
} else if (!is_move(cmd[1]))
return -1;
else {
if ((ncursor = domove(argcnt, &cmd[1], 1)) < 0)
return -1;
if (*cmd == 'c' &&
(cmd[1]=='w' || cmd[1]=='W') &&
!isspace(es->cbuf[es->cursor])) {
while (isspace(es->cbuf[--ncursor]))
;
ncursor++;
}
if (ncursor > es->cursor) {
c1 = es->cursor;
c2 = ncursor;
} else {
c1 = ncursor;
c2 = es->cursor;
if (cmd[1] == '%')
c2++;
}
}
if (*cmd != 'c' && c1 != c2)
yank_range(c1, c2);
if (*cmd != 'y') {
del_range(c1, c2);
es->cursor = c1;
}
if (*cmd == 'c') {
modified = 1; hnum = hlast;
insert = INSERT;
}
break;
case 'p':
modified = 1; hnum = hlast;
if (es->linelen != 0)
es->cursor++;
while (putbuf(ybuf, yanklen, 0) == 0 && --argcnt > 0)
;
if (es->cursor != 0)
es->cursor--;
if (argcnt != 0)
return -1;
break;
case 'P':
modified = 1; hnum = hlast;
any = 0;
while (putbuf(ybuf, yanklen, 0) == 0 && --argcnt > 0)
any = 1;
if (any && es->cursor != 0)
es->cursor--;
if (argcnt != 0)
return -1;
break;
case 'C':
modified = 1; hnum = hlast;
del_range(es->cursor, es->linelen);
insert = INSERT;
break;
case 'D':
yank_range(es->cursor, es->linelen);
del_range(es->cursor, es->linelen);
if (es->cursor != 0)
es->cursor--;
break;
case 'g':
if (!argcnt)
argcnt = hlast;
/* FALLTHROUGH */
case 'G':
if (!argcnt)
argcnt = 1;
else
argcnt = hlast - (source->line - argcnt);
if (grabhist(modified, argcnt - 1) < 0)
return -1;
else {
modified = 0;
hnum = argcnt - 1;
}
break;
case 'i':
modified = 1; hnum = hlast;
insert = INSERT;
break;
case 'I':
modified = 1; hnum = hlast;
es->cursor = domove(1, "^", 1);
insert = INSERT;
break;
case 'j':
case '+':
case Ctrl('n'):
if (grabhist(modified, hnum + argcnt) < 0)
return -1;
else {
modified = 0;
hnum += argcnt;
}
break;
case 'k':
case '-':
case Ctrl('p'):
if (grabhist(modified, hnum - argcnt) < 0)
return -1;
else {
modified = 0;
hnum -= argcnt;
}
break;
case 'r':
if (es->linelen == 0)
return -1;
modified = 1; hnum = hlast;
if (cmd[1] == 0)
vi_error();
else {
int n;
if (es->cursor + argcnt > es->linelen)
return -1;
for (n = 0; n < argcnt; ++n)
es->cbuf[es->cursor + n] = cmd[1];
es->cursor += n - 1;
}
break;
case 'R':
modified = 1; hnum = hlast;
insert = REPLACE;
break;
case 's':
if (es->linelen == 0)
return -1;
modified = 1; hnum = hlast;
if (es->cursor + argcnt > es->linelen)
argcnt = es->linelen - es->cursor;
del_range(es->cursor, es->cursor + argcnt);
insert = INSERT;
break;
case 'v':
if (es->linelen == 0 && argcnt == 0)
return -1;
if (!argcnt) {
if (modified) {
es->cbuf[es->linelen] = '\0';
source->line++;
histsave(source->line, es->cbuf, 1);
} else
argcnt = source->line + 1
- (hlast - hnum);
}
shf_snprintf(es->cbuf, es->cbufsize,
argcnt ? "%s %d" : "%s",
"fc -e ${VISUAL:-${EDITOR:-vi}} --",
argcnt);
es->linelen = strlen(es->cbuf);
return 2;
case 'x':
if (es->linelen == 0)
return -1;
modified = 1; hnum = hlast;
if (es->cursor + argcnt > es->linelen)
argcnt = es->linelen - es->cursor;
yank_range(es->cursor, es->cursor + argcnt);
del_range(es->cursor, es->cursor + argcnt);
break;
case 'X':
if (es->cursor > 0) {
modified = 1; hnum = hlast;
if (es->cursor < argcnt)
argcnt = es->cursor;
yank_range(es->cursor - argcnt, es->cursor);
del_range(es->cursor - argcnt, es->cursor);
es->cursor -= argcnt;
} else
return -1;
break;
case 'u':
t = es;
es = undo;
undo = t;
break;
case 'U':
if (!modified)
return -1;
if (grabhist(modified, ohnum) < 0)
return -1;
modified = 0;
hnum = ohnum;
break;
case '?':
if (hnum == hlast)
hnum = -1;
/* ahhh */
case '/':