/* $NetBSD: histedit.c,v 1.55.2.1 2022/02/21 17:58:11 martin Exp $ */
/*-
* 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)histedit.c 8.2 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: histedit.c,v 1.55.2.1 2022/02/21 17:58:11 martin Exp $");
#endif
#endif /* not lint */
#include <sys/param.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 "builtins.h"
#include "main.h"
#include "output.h"
#include "mystring.h"
#include "myhistedit.h"
#include "error.h"
#include "alias.h"
#ifndef SMALL
#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 const char *fc_replace(const char *, char *, char *);
#ifdef DEBUG
extern FILE *tracefile;
#endif
/*
* Set history and editing status. Called whenever the status may
* have changed (figures out what to do).
*/
void
histedit(void)
{
FILE *el_err;
#define editing (Eflag || Vflag)
if (iflag == 1) {
if (!hist) {
/*
* turn history on
*/
INTOFF;
hist = history_init();
INTON;
if (hist != NULL)
sethistsize(histsizeval());
else
out2str("sh: can't initialize history\n");
}
if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
/*
* turn editing on
*/
char *term, *shname;
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;
el_err = el_out;
#if DEBUG
if (tracefile)
el_err = tracefile;
#endif
term = lookupvar("TERM");
if (term)
setenv("TERM", term, 1);
else
unsetenv("TERM");
shname = arg0;
if (shname[0] == '-')
shname++;
el = el_init(shname, el_in, el_out, el_err);
if (el != NULL) {
if (hist)
el_set(el, EL_HIST, history, hist);
set_prompt_lit(lookupvar("PSlit"));
el_set(el, EL_SIGNAL, 1);
el_set(el, EL_ALIAS_TEXT, alias_text, NULL);
el_set(el, EL_ADDFN, "rl-complete",
"ReadLine compatible completion function",
_el_fn_complete);
} else {
bad:
out2str("sh: can't initialize editing\n");
}
INTON;
} else if (!editing && el) {
INTOFF;
el_end(el);
el = NULL;
INTON;
}
if (el) {
INTOFF;
if (Vflag)
el_set(el, EL_EDITOR, "vi");
else if (Eflag)
el_set(el, EL_EDITOR, "emacs");
el_set(el, EL_BIND, "^I",
tabcomplete ? "rl-complete" : "ed-insert", NULL);
el_source(el, lookupvar("EDITRC"));
INTON;
}
} else {
INTOFF;
if (el) { /* no editing if not interactive */
el_end(el);
el = NULL;
}
if (hist) {
history_end(hist);
hist = NULL;
}
INTON;
}
}
void
set_prompt_lit(const char *lit_ch)
{
wchar_t wc;
if (!(iflag && editing && el))
return;
if (lit_ch == NULL) {
el_set(el, EL_PROMPT, getprompt);
return;
}
mbtowc(&wc, NULL, 1); /* state init */
INTOFF;
if (mbtowc(&wc, lit_ch, strlen(lit_ch)) <= 0)
el_set(el, EL_PROMPT, getprompt);
else
el_set(el, EL_PROMPT_ESC, getprompt, (int)wc);
INTON;
}
void
set_editrc(const char *fname)
{
INTOFF;
if (iflag && editing && el)
el_source(el, fname);
INTON;
}
void
sethistsize(const char *hs)
{
int histsize;
HistEvent he;
if (hist != NULL) {
if (hs == NULL || *hs == '\0' || *hs == '-' ||
(histsize = number(hs)) < 0)
histsize = 100;
INTOFF;
history(hist, &he, H_SETSIZE, histsize);
history(hist, &he, H_SETUNIQUE, 1);
INTON;
}
}
void
setterm(const char *term)
{
INTOFF;
if (el != NULL && term != NULL)
if (el_set(el, EL_TERMINAL, term) != 0) {
outfmt(out2, "sh: Can't set terminal type %s\n", term);
outfmt(out2, "sh: Using dumb terminal settings.\n");
}
INTON;
}
int
inputrc(int argc, char **argv)
{
if (argc != 2) {
out2str("usage: inputrc file\n");
return 1;
}
if (el != NULL) {
INTOFF;
if (el_source(el, argv[1])) {
INTON;
out2str("inputrc: failed\n");
return 1;
}
INTON;
return 0;
} else {
out2str("sh: inputrc ignored, not editing\n");
return 1;
}
}
/*
* This command is provided since POSIX decided to standardize
* the Korn shell fc command. Oh well...
*/
int
histcmd(volatile int argc, char ** volatile argv)
{
int ch;
const char * volatile editor = NULL;
HistEvent he;
volatile int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
int i, retval;
const char *firststr, *laststr;
int first, last, direction;
char * volatile pat = NULL, * volatile repl; /* ksh "fc old=new" crap */
static int active = 0;
struct jmploc jmploc;
struct jmploc *volatile savehandler;
char editfile[MAXPATHLEN + 1];
FILE * volatile efp;
#ifdef __GNUC__
repl = NULL; /* XXX gcc4 */
efp = NULL; /* XXX gcc4 */
#endif
if (hist == NULL)
error("history not active");
if (argc == 1)
error("missing history argument");
optreset = 1; optind = 1; /* initialize getopt */
while (not_fcnumber(argv[optind]) &&
(ch = getopt(argc, argv, ":e:lnrs")) != -1)
switch ((char)ch) {
case 'e':
editor = optarg;
break;
case 'l':
lflg = 1;
break;
case 'n':
nflg = 1;
break;
case 'r':
rflg = 1;
break;
case 's':
sflg = 1;
break;
case ':':
error("option -%c expects argument", optopt);
/* NOTREACHED */
case '?':
default:
error("unknown option: -%c", optopt);
/* NOTREACHED */
}
argc -= optind, argv += optind;
/*
* If executing...
*/
if (lflg == 0 || editor || sflg) {
lflg = 0; /* ignore */
editfile[0] = '\0';
/*
* Catch interrupts to reset active counter and
* cleanup temp files.
*/
savehandler = handler;
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 && argc > 0 &&
((repl = strchr(argv[0], '=')) != NULL)) {
pat = argv[0];
*repl++ = '\0';
argc--, argv++;
}
/*
* If -s is specified, accept only one operand
*/
if (sflg && argc >= 2)
error("too many args");
/*
* determine [first] and [last]
*/
switch (argc) {
case 0:
firststr = lflg ? "-16" : "-1";
laststr = "-1";
break;
case 1:
firststr = argv[0];
laststr = lflg ? "-1" : argv[0];
break;
case 2:
firststr = argv[0];
laststr = argv[1];
break;
default:
error("too many args");
/* NOTREACHED */
}
/*
* 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 */
snprintf(editfile, sizeof(editfile), "%s_shXXXXXX", _PATH_TMP);
if ((fd = mkstemp(editfile)) < 0)
error("can't create temporary file %s", editfile);
if ((efp = fdopen(fd, "w")) == NULL) {
close(fd);
error("can't allocate stdio buffer for temp");
}
}
/*
* 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);
}
evalstring(strcpy(stalloc(strlen(s) + 1), s), 0);
if (displayhist && hist) {
/*
* XXX what about recursive and
* relative histnums.
*/
history(hist, &he, H_ENTER, s);
}
break;
} 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;
size_t cmdlen;
fclose(efp);
cmdlen = strlen(editor) + strlen(editfile) + 2;
editcmd = stalloc(cmdlen);
snprintf(editcmd, cmdlen, "%s %s", editor, editfile);
evalstring(editcmd, 0); /* XXX - should use no JC command */
stunalloc(editcmd);
readcmdfile(editfile); /* XXX - should read back - quick tst */
unlink(editfile);
INTON;
}
if (lflg == 0 && active > 0)
--active;
if (displayhist)
displayhist = 0;
return 0;
}
STATIC const 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) {
while (*r)
STPUTC(*r++, dest);
s += plen;
*p = '\0'; /* so no more matches */
} else
STPUTC(*s++, dest);
}
STACKSTRNUL(dest);
dest = grabstackstr(dest);
return (dest);
}
int
not_fcnumber(char *s)
{
if (s == NULL)
return 0;
if (*s == '-')
s++;
return (!is_number(s));
}
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 = number(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);
}
#else
int
histcmd(int argc, char **argv)
{
error("not compiled with history support");
/* NOTREACHED */
}
int
inputrc(int argc, char **argv)
{
error("not compiled with history support");
/* NOTREACHED */
}
#endif