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diff --git a/bin/sh/histedit.c b/bin/sh/histedit.c
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+/*-
+ * Copyright (c) 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)histedit.c 8.2 (Berkeley) 5/4/95";
+#endif
+#endif /* not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <limits.h>
+#include <paths.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+/*
+ * Editline and history functions (and glue).
+ */
+#include "shell.h"
+#include "parser.h"
+#include "var.h"
+#include "options.h"
+#include "main.h"
+#include "output.h"
+#include "mystring.h"
+#include "builtins.h"
+#ifndef NO_HISTORY
+#include "myhistedit.h"
+#include "error.h"
+#include "eval.h"
+#include "memalloc.h"
+
+#define MAXHISTLOOPS 4 /* max recursions through fc */
+#define DEFEDITOR "ed" /* default editor *should* be $EDITOR */
+
+History *hist; /* history cookie */
+EditLine *el; /* editline cookie */
+int displayhist;
+static FILE *el_in, *el_out;
+
+static char *fc_replace(const char *, char *, char *);
+static int not_fcnumber(const char *);
+static int str_to_event(const char *, int);
+
+/*
+ * Set history and editing status. Called whenever the status may
+ * have changed (figures out what to do).
+ */
+void
+histedit(void)
+{
+
+#define editing (Eflag || Vflag)
+
+ if (iflag) {
+ if (!hist) {
+ /*
+ * turn history on
+ */
+ INTOFF;
+ hist = history_init();
+ INTON;
+
+ if (hist != NULL)
+ sethistsize(histsizeval());
+ else
+ out2fmt_flush("sh: can't initialize history\n");
+ }
+ if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
+ /*
+ * turn editing on
+ */
+ char *term;
+
+ INTOFF;
+ if (el_in == NULL)
+ el_in = fdopen(0, "r");
+ if (el_out == NULL)
+ el_out = fdopen(2, "w");
+ if (el_in == NULL || el_out == NULL)
+ goto bad;
+ term = lookupvar("TERM");
+ if (term)
+ setenv("TERM", term, 1);
+ else
+ unsetenv("TERM");
+ el = el_init(arg0, el_in, el_out, el_out);
+ if (el != NULL) {
+ if (hist)
+ el_set(el, EL_HIST, history, hist);
+ el_set(el, EL_PROMPT, getprompt);
+ el_set(el, EL_ADDFN, "sh-complete",
+ "Filename completion",
+ _el_fn_complete);
+ } else {
+bad:
+ out2fmt_flush("sh: can't initialize editing\n");
+ }
+ INTON;
+ } else if (!editing && el) {
+ INTOFF;
+ el_end(el);
+ el = NULL;
+ INTON;
+ }
+ if (el) {
+ if (Vflag)
+ el_set(el, EL_EDITOR, "vi");
+ else if (Eflag)
+ el_set(el, EL_EDITOR, "emacs");
+ el_set(el, EL_BIND, "^I", "sh-complete", NULL);
+ el_source(el, NULL);
+ }
+ } else {
+ INTOFF;
+ if (el) { /* no editing if not interactive */
+ el_end(el);
+ el = NULL;
+ }
+ if (hist) {
+ history_end(hist);
+ hist = NULL;
+ }
+ INTON;
+ }
+}
+
+
+void
+sethistsize(const char *hs)
+{
+ int histsize;
+ HistEvent he;
+
+ if (hist != NULL) {
+ if (hs == NULL || !is_number(hs))
+ histsize = 100;
+ else
+ histsize = atoi(hs);
+ history(hist, &he, H_SETSIZE, histsize);
+ history(hist, &he, H_SETUNIQUE, 1);
+ }
+}
+
+void
+setterm(const char *term)
+{
+ if (rootshell && el != NULL && term != NULL)
+ el_set(el, EL_TERMINAL, term);
+}
+
+int
+histcmd(int argc, char **argv __unused)
+{
+ int ch;
+ const char *editor = NULL;
+ HistEvent he;
+ int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
+ int i, retval;
+ const char *firststr, *laststr;
+ int first, last, direction;
+ char *pat = NULL, *repl = NULL;
+ static int active = 0;
+ struct jmploc jmploc;
+ struct jmploc *savehandler;
+ char editfilestr[PATH_MAX];
+ char *volatile editfile;
+ FILE *efp = NULL;
+ int oldhistnum;
+
+ if (hist == NULL)
+ error("history not active");
+
+ if (argc == 1)
+ error("missing history argument");
+
+ while (not_fcnumber(*argptr) && (ch = nextopt("e:lnrs")) != '\0')
+ switch ((char)ch) {
+ case 'e':
+ editor = shoptarg;
+ break;
+ case 'l':
+ lflg = 1;
+ break;
+ case 'n':
+ nflg = 1;
+ break;
+ case 'r':
+ rflg = 1;
+ break;
+ case 's':
+ sflg = 1;
+ break;
+ }
+
+ savehandler = handler;
+ /*
+ * If executing...
+ */
+ if (lflg == 0 || editor || sflg) {
+ lflg = 0; /* ignore */
+ editfile = NULL;
+ /*
+ * Catch interrupts to reset active counter and
+ * cleanup temp files.
+ */
+ if (setjmp(jmploc.loc)) {
+ active = 0;
+ if (editfile)
+ unlink(editfile);
+ handler = savehandler;
+ longjmp(handler->loc, 1);
+ }
+ handler = &jmploc;
+ if (++active > MAXHISTLOOPS) {
+ active = 0;
+ displayhist = 0;
+ error("called recursively too many times");
+ }
+ /*
+ * Set editor.
+ */
+ if (sflg == 0) {
+ if (editor == NULL &&
+ (editor = bltinlookup("FCEDIT", 1)) == NULL &&
+ (editor = bltinlookup("EDITOR", 1)) == NULL)
+ editor = DEFEDITOR;
+ if (editor[0] == '-' && editor[1] == '\0') {
+ sflg = 1; /* no edit */
+ editor = NULL;
+ }
+ }
+ }
+
+ /*
+ * If executing, parse [old=new] now
+ */
+ if (lflg == 0 && *argptr != NULL &&
+ ((repl = strchr(*argptr, '=')) != NULL)) {
+ pat = *argptr;
+ *repl++ = '\0';
+ argptr++;
+ }
+ /*
+ * determine [first] and [last]
+ */
+ if (*argptr == NULL) {
+ firststr = lflg ? "-16" : "-1";
+ laststr = "-1";
+ } else if (argptr[1] == NULL) {
+ firststr = argptr[0];
+ laststr = lflg ? "-1" : argptr[0];
+ } else if (argptr[2] == NULL) {
+ firststr = argptr[0];
+ laststr = argptr[1];
+ } else
+ error("too many arguments");
+ /*
+ * Turn into event numbers.
+ */
+ first = str_to_event(firststr, 0);
+ last = str_to_event(laststr, 1);
+
+ if (rflg) {
+ i = last;
+ last = first;
+ first = i;
+ }
+ /*
+ * XXX - this should not depend on the event numbers
+ * always increasing. Add sequence numbers or offset
+ * to the history element in next (diskbased) release.
+ */
+ direction = first < last ? H_PREV : H_NEXT;
+
+ /*
+ * If editing, grab a temp file.
+ */
+ if (editor) {
+ int fd;
+ INTOFF; /* easier */
+ sprintf(editfilestr, "%s/_shXXXXXX", _PATH_TMP);
+ if ((fd = mkstemp(editfilestr)) < 0)
+ error("can't create temporary file %s", editfile);
+ editfile = editfilestr;
+ if ((efp = fdopen(fd, "w")) == NULL) {
+ close(fd);
+ error("Out of space");
+ }
+ }
+
+ /*
+ * Loop through selected history events. If listing or executing,
+ * do it now. Otherwise, put into temp file and call the editor
+ * after.
+ *
+ * The history interface needs rethinking, as the following
+ * convolutions will demonstrate.
+ */
+ history(hist, &he, H_FIRST);
+ retval = history(hist, &he, H_NEXT_EVENT, first);
+ for (;retval != -1; retval = history(hist, &he, direction)) {
+ if (lflg) {
+ if (!nflg)
+ out1fmt("%5d ", he.num);
+ out1str(he.str);
+ } else {
+ const char *s = pat ?
+ fc_replace(he.str, pat, repl) : he.str;
+
+ if (sflg) {
+ if (displayhist) {
+ out2str(s);
+ flushout(out2);
+ }
+ evalstring(s, 0);
+ if (displayhist && hist) {
+ /*
+ * XXX what about recursive and
+ * relative histnums.
+ */
+ oldhistnum = he.num;
+ history(hist, &he, H_ENTER, s);
+ /*
+ * XXX H_ENTER moves the internal
+ * cursor, set it back to the current
+ * entry.
+ */
+ history(hist, &he,
+ H_NEXT_EVENT, oldhistnum);
+ }
+ } else
+ fputs(s, efp);
+ }
+ /*
+ * At end? (if we were to lose last, we'd sure be
+ * messed up).
+ */
+ if (he.num == last)
+ break;
+ }
+ if (editor) {
+ char *editcmd;
+
+ fclose(efp);
+ INTON;
+ editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
+ sprintf(editcmd, "%s %s", editor, editfile);
+ evalstring(editcmd, 0); /* XXX - should use no JC command */
+ readcmdfile(editfile); /* XXX - should read back - quick tst */
+ unlink(editfile);
+ }
+
+ if (lflg == 0 && active > 0)
+ --active;
+ if (displayhist)
+ displayhist = 0;
+ handler = savehandler;
+ return 0;
+}
+
+static char *
+fc_replace(const char *s, char *p, char *r)
+{
+ char *dest;
+ int plen = strlen(p);
+
+ STARTSTACKSTR(dest);
+ while (*s) {
+ if (*s == *p && strncmp(s, p, plen) == 0) {
+ STPUTS(r, dest);
+ s += plen;
+ *p = '\0'; /* so no more matches */
+ } else
+ STPUTC(*s++, dest);
+ }
+ STPUTC('\0', dest);
+ dest = grabstackstr(dest);
+
+ return (dest);
+}
+
+static int
+not_fcnumber(const char *s)
+{
+ if (s == NULL)
+ return (0);
+ if (*s == '-')
+ s++;
+ return (!is_number(s));
+}
+
+static int
+str_to_event(const char *str, int last)
+{
+ HistEvent he;
+ const char *s = str;
+ int relative = 0;
+ int i, retval;
+
+ retval = history(hist, &he, H_FIRST);
+ switch (*s) {
+ case '-':
+ relative = 1;
+ /*FALLTHROUGH*/
+ case '+':
+ s++;
+ }
+ if (is_number(s)) {
+ i = atoi(s);
+ if (relative) {
+ while (retval != -1 && i--) {
+ retval = history(hist, &he, H_NEXT);
+ }
+ if (retval == -1)
+ retval = history(hist, &he, H_LAST);
+ } else {
+ retval = history(hist, &he, H_NEXT_EVENT, i);
+ if (retval == -1) {
+ /*
+ * the notion of first and last is
+ * backwards to that of the history package
+ */
+ retval = history(hist, &he, last ? H_FIRST : H_LAST);
+ }
+ }
+ if (retval == -1)
+ error("history number %s not found (internal error)",
+ str);
+ } else {
+ /*
+ * pattern
+ */
+ retval = history(hist, &he, H_PREV_STR, str);
+ if (retval == -1)
+ error("history pattern not found: %s", str);
+ }
+ return (he.num);
+}
+
+int
+bindcmd(int argc, char **argv)
+{
+ int ret;
+ FILE *old;
+ FILE *out;
+
+ if (el == NULL)
+ error("line editing is disabled");
+
+ INTOFF;
+
+ out = out1fp();
+ if (out == NULL)
+ error("Out of space");
+
+ el_get(el, EL_GETFP, 1, &old);
+ el_set(el, EL_SETFP, 1, out);
+
+ ret = el_parse(el, argc, __DECONST(const char **, argv));
+
+ el_set(el, EL_SETFP, 1, old);
+
+ fclose(out);
+
+ INTON;
+
+ return ret;
+}
+
+#else
+#include "error.h"
+
+int
+histcmd(int argc __unused, char **argv __unused)
+{
+
+ error("not compiled with history support");
+ /*NOTREACHED*/
+ return (0);
+}
+
+int
+bindcmd(int argc __unused, char **argv __unused)
+{
+
+ error("not compiled with line editing support");
+ return (0);
+}
+#endif
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