Without this patch, sh can autocomplete file names but not commands from $PATH. Use libedit's facility to execute custom function for autocomplete, but yield to the library's standard autocomplete function when cursor is not at position 0. Reviewed by: bapt Differential Revision: https://reviews.freebsd.org/D29361
648 lines
14 KiB
C
648 lines
14 KiB
C
/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)histedit.c 8.2 (Berkeley) 5/4/95";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <limits.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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/*
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* Editline and history functions (and glue).
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*/
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#include "shell.h"
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#include "parser.h"
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#include "var.h"
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#include "options.h"
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#include "main.h"
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#include "output.h"
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#include "mystring.h"
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#include "builtins.h"
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#ifndef NO_HISTORY
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#include "myhistedit.h"
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#include "error.h"
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#include "eval.h"
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#include "memalloc.h"
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#define MAXHISTLOOPS 4 /* max recursions through fc */
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#define DEFEDITOR "ed" /* default editor *should* be $EDITOR */
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History *hist; /* history cookie */
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EditLine *el; /* editline cookie */
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int displayhist;
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static FILE *el_in, *el_out;
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static char *fc_replace(const char *, char *, char *);
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static int not_fcnumber(const char *);
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static int str_to_event(const char *, int);
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static int comparator(const void *, const void *, void *);
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static char **sh_matches(const char *, int, int);
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static unsigned char sh_complete(EditLine *, int);
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/*
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* Set history and editing status. Called whenever the status may
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* have changed (figures out what to do).
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*/
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void
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histedit(void)
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{
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#define editing (Eflag || Vflag)
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if (iflag) {
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if (!hist) {
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/*
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* turn history on
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*/
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INTOFF;
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hist = history_init();
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INTON;
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if (hist != NULL)
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sethistsize(histsizeval());
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else
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out2fmt_flush("sh: can't initialize history\n");
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}
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if (editing && !el && isatty(0)) { /* && isatty(2) ??? */
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/*
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* turn editing on
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*/
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char *term;
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INTOFF;
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if (el_in == NULL)
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el_in = fdopen(0, "r");
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if (el_out == NULL)
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el_out = fdopen(2, "w");
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if (el_in == NULL || el_out == NULL)
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goto bad;
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term = lookupvar("TERM");
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if (term)
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setenv("TERM", term, 1);
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else
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unsetenv("TERM");
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el = el_init(arg0, el_in, el_out, el_out);
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if (el != NULL) {
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if (hist)
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el_set(el, EL_HIST, history, hist);
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el_set(el, EL_PROMPT, getprompt);
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el_set(el, EL_ADDFN, "sh-complete",
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"Filename completion",
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sh_complete);
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} else {
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bad:
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out2fmt_flush("sh: can't initialize editing\n");
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}
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INTON;
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} else if (!editing && el) {
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INTOFF;
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el_end(el);
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el = NULL;
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INTON;
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}
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if (el) {
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if (Vflag)
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el_set(el, EL_EDITOR, "vi");
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else if (Eflag)
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el_set(el, EL_EDITOR, "emacs");
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el_set(el, EL_BIND, "^I", "sh-complete", NULL);
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el_source(el, NULL);
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}
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} else {
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INTOFF;
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if (el) { /* no editing if not interactive */
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el_end(el);
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el = NULL;
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}
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if (hist) {
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history_end(hist);
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hist = NULL;
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}
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INTON;
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}
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}
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void
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sethistsize(const char *hs)
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{
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int histsize;
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HistEvent he;
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if (hist != NULL) {
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if (hs == NULL || !is_number(hs))
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histsize = 100;
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else
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histsize = atoi(hs);
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history(hist, &he, H_SETSIZE, histsize);
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history(hist, &he, H_SETUNIQUE, 1);
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}
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}
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void
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setterm(const char *term)
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{
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if (rootshell && el != NULL && term != NULL)
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el_set(el, EL_TERMINAL, term);
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}
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int
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histcmd(int argc, char **argv __unused)
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{
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int ch;
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const char *editor = NULL;
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HistEvent he;
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int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
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int i, retval;
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const char *firststr, *laststr;
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int first, last, direction;
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char *pat = NULL, *repl = NULL;
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static int active = 0;
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struct jmploc jmploc;
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struct jmploc *savehandler;
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char editfilestr[PATH_MAX];
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char *volatile editfile;
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FILE *efp = NULL;
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int oldhistnum;
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if (hist == NULL)
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error("history not active");
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if (argc == 1)
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error("missing history argument");
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while (not_fcnumber(*argptr) && (ch = nextopt("e:lnrs")) != '\0')
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switch ((char)ch) {
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case 'e':
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editor = shoptarg;
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break;
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case 'l':
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lflg = 1;
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break;
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case 'n':
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nflg = 1;
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break;
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case 'r':
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rflg = 1;
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break;
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case 's':
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sflg = 1;
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break;
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}
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savehandler = handler;
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/*
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* If executing...
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*/
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if (lflg == 0 || editor || sflg) {
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lflg = 0; /* ignore */
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editfile = NULL;
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/*
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* Catch interrupts to reset active counter and
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* cleanup temp files.
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*/
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if (setjmp(jmploc.loc)) {
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active = 0;
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if (editfile)
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unlink(editfile);
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handler = savehandler;
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longjmp(handler->loc, 1);
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}
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handler = &jmploc;
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if (++active > MAXHISTLOOPS) {
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active = 0;
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displayhist = 0;
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error("called recursively too many times");
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}
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/*
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* Set editor.
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*/
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if (sflg == 0) {
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if (editor == NULL &&
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(editor = bltinlookup("FCEDIT", 1)) == NULL &&
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(editor = bltinlookup("EDITOR", 1)) == NULL)
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editor = DEFEDITOR;
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if (editor[0] == '-' && editor[1] == '\0') {
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sflg = 1; /* no edit */
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editor = NULL;
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}
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}
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}
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/*
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* If executing, parse [old=new] now
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*/
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if (lflg == 0 && *argptr != NULL &&
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((repl = strchr(*argptr, '=')) != NULL)) {
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pat = *argptr;
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*repl++ = '\0';
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argptr++;
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}
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/*
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* determine [first] and [last]
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*/
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if (*argptr == NULL) {
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firststr = lflg ? "-16" : "-1";
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laststr = "-1";
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} else if (argptr[1] == NULL) {
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firststr = argptr[0];
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laststr = lflg ? "-1" : argptr[0];
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} else if (argptr[2] == NULL) {
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firststr = argptr[0];
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laststr = argptr[1];
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} else
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error("too many arguments");
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/*
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* Turn into event numbers.
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*/
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first = str_to_event(firststr, 0);
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last = str_to_event(laststr, 1);
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if (rflg) {
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i = last;
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last = first;
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first = i;
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}
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/*
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* XXX - this should not depend on the event numbers
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* always increasing. Add sequence numbers or offset
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* to the history element in next (diskbased) release.
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*/
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direction = first < last ? H_PREV : H_NEXT;
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/*
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* If editing, grab a temp file.
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*/
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if (editor) {
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int fd;
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INTOFF; /* easier */
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sprintf(editfilestr, "%s/_shXXXXXX", _PATH_TMP);
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if ((fd = mkstemp(editfilestr)) < 0)
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error("can't create temporary file %s", editfile);
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editfile = editfilestr;
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if ((efp = fdopen(fd, "w")) == NULL) {
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close(fd);
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error("Out of space");
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}
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}
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/*
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* Loop through selected history events. If listing or executing,
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* do it now. Otherwise, put into temp file and call the editor
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* after.
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*
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* The history interface needs rethinking, as the following
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* convolutions will demonstrate.
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*/
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history(hist, &he, H_FIRST);
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retval = history(hist, &he, H_NEXT_EVENT, first);
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for (;retval != -1; retval = history(hist, &he, direction)) {
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if (lflg) {
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if (!nflg)
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out1fmt("%5d ", he.num);
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out1str(he.str);
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} else {
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const char *s = pat ?
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fc_replace(he.str, pat, repl) : he.str;
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if (sflg) {
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if (displayhist) {
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out2str(s);
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flushout(out2);
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}
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evalstring(s, 0);
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if (displayhist && hist) {
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/*
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* XXX what about recursive and
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* relative histnums.
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*/
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oldhistnum = he.num;
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history(hist, &he, H_ENTER, s);
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/*
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* XXX H_ENTER moves the internal
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* cursor, set it back to the current
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* entry.
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*/
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history(hist, &he,
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H_NEXT_EVENT, oldhistnum);
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}
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} else
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fputs(s, efp);
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}
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/*
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* At end? (if we were to lose last, we'd sure be
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* messed up).
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*/
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if (he.num == last)
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break;
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}
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if (editor) {
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char *editcmd;
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fclose(efp);
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INTON;
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editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
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sprintf(editcmd, "%s %s", editor, editfile);
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evalstring(editcmd, 0); /* XXX - should use no JC command */
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readcmdfile(editfile); /* XXX - should read back - quick tst */
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unlink(editfile);
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}
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if (lflg == 0 && active > 0)
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--active;
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if (displayhist)
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displayhist = 0;
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handler = savehandler;
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return 0;
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}
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static char *
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fc_replace(const char *s, char *p, char *r)
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{
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char *dest;
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int plen = strlen(p);
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STARTSTACKSTR(dest);
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while (*s) {
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if (*s == *p && strncmp(s, p, plen) == 0) {
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STPUTS(r, dest);
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s += plen;
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*p = '\0'; /* so no more matches */
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} else
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STPUTC(*s++, dest);
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}
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STPUTC('\0', dest);
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dest = grabstackstr(dest);
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return (dest);
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}
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static int
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not_fcnumber(const char *s)
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{
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if (s == NULL)
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return (0);
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if (*s == '-')
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s++;
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return (!is_number(s));
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}
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static int
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str_to_event(const char *str, int last)
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{
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HistEvent he;
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const char *s = str;
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int relative = 0;
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int i, retval;
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retval = history(hist, &he, H_FIRST);
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switch (*s) {
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case '-':
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relative = 1;
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/*FALLTHROUGH*/
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case '+':
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s++;
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}
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if (is_number(s)) {
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i = atoi(s);
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if (relative) {
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while (retval != -1 && i--) {
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retval = history(hist, &he, H_NEXT);
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}
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if (retval == -1)
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retval = history(hist, &he, H_LAST);
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} else {
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retval = history(hist, &he, H_NEXT_EVENT, i);
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if (retval == -1) {
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/*
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* the notion of first and last is
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* backwards to that of the history package
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*/
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retval = history(hist, &he, last ? H_FIRST : H_LAST);
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}
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}
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if (retval == -1)
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error("history number %s not found (internal error)",
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str);
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} else {
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/*
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* pattern
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*/
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retval = history(hist, &he, H_PREV_STR, str);
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if (retval == -1)
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error("history pattern not found: %s", str);
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}
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return (he.num);
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}
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int
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bindcmd(int argc, char **argv)
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{
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int ret;
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FILE *old;
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FILE *out;
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if (el == NULL)
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error("line editing is disabled");
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INTOFF;
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out = out1fp();
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if (out == NULL)
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error("Out of space");
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el_get(el, EL_GETFP, 1, &old);
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el_set(el, EL_SETFP, 1, out);
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ret = el_parse(el, argc, __DECONST(const char **, argv));
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el_set(el, EL_SETFP, 1, old);
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fclose(out);
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INTON;
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return ret;
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}
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#else
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#include "error.h"
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int
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histcmd(int argc __unused, char **argv __unused)
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{
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error("not compiled with history support");
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/*NOTREACHED*/
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return (0);
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}
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int
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bindcmd(int argc __unused, char **argv __unused)
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{
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error("not compiled with line editing support");
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return (0);
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}
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#endif
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/*
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* Comparator function for qsort(). The use of curpos here is to skip
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* characters that we already know to compare equal (common prefix).
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*/
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static int
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comparator(const void *a, const void *b, void *thunk)
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{
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size_t curpos = (intptr_t)thunk;
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return (strcmp(*(char *const *)a + curpos,
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*(char *const *)b + curpos));
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}
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/*
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* This function is passed to libedit's fn_complete2(). The library will
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* use it instead of its standard function that finds matching files in
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* current directory. If we're at the start of the line, we want to look
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* for available commands from all paths in $PATH.
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*/
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static char
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**sh_matches(const char *text, int start, int end)
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{
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char *free_path = NULL, *path;
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const char *dirname;
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char **matches = NULL;
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size_t i = 0, size = 16, j, k;
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size_t curpos = end - start;
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if (start > 0 || memchr("/.~", text[0], 3) != NULL)
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return (NULL);
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if ((free_path = path = strdup(pathval())) == NULL)
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goto out;
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if ((matches = malloc(size * sizeof(matches[0]))) == NULL)
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goto out;
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while ((dirname = strsep(&path, ":")) != NULL) {
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struct dirent *entry;
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DIR *dir;
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int dfd;
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|
dir = opendir(dirname[0] == '\0' ? "." : dirname);
|
|
if (dir == NULL)
|
|
continue;
|
|
if ((dfd = dirfd(dir)) == -1) {
|
|
closedir(dir);
|
|
continue;
|
|
}
|
|
while ((entry = readdir(dir)) != NULL) {
|
|
struct stat statb;
|
|
char **rmatches;
|
|
|
|
if (strncmp(entry->d_name, text, curpos) != 0)
|
|
continue;
|
|
if (entry->d_type == DT_UNKNOWN || entry->d_type == DT_LNK) {
|
|
if (fstatat(dfd, entry->d_name, &statb, 0) == -1)
|
|
continue;
|
|
if (!S_ISREG(statb.st_mode))
|
|
continue;
|
|
} else if (entry->d_type != DT_REG)
|
|
continue;
|
|
matches[++i] = strdup(entry->d_name);
|
|
if (i < size - 1)
|
|
continue;
|
|
size *= 2;
|
|
rmatches = reallocarray(matches, size, sizeof(matches[0]));
|
|
if (rmatches == NULL) {
|
|
closedir(dir);
|
|
goto out;
|
|
}
|
|
matches = rmatches;
|
|
}
|
|
closedir(dir);
|
|
}
|
|
out:
|
|
free(free_path);
|
|
/*
|
|
* matches[0] is special: it's not a real matching file name but a common
|
|
* prefix for all matching names. It can't be null, unlike any other
|
|
* element of the array. When strings matches[0] and matches[1] compare
|
|
* equal and matches[2] is null that means to libedit that there is only
|
|
* a single match. It will then replace user input with possibly escaped
|
|
* string in matches[0] which is the reason to copy the full name of the
|
|
* only match.
|
|
*/
|
|
if (i == 0) {
|
|
free(matches);
|
|
return (NULL);
|
|
} else if (i == 1) {
|
|
matches[0] = strdup(matches[1]);
|
|
matches[2] = NULL;
|
|
if (matches[0] != NULL)
|
|
return (matches);
|
|
} else
|
|
matches[0] = strdup(text);
|
|
if (matches[0] == NULL) {
|
|
for (j = 1; j <= i; j++)
|
|
free(matches[j]);
|
|
free(matches);
|
|
return (NULL);
|
|
}
|
|
qsort_s(matches + 1, i, sizeof(matches[0]), comparator,
|
|
(void *)(intptr_t)curpos);
|
|
for (j = 1, k = 2; k <= i; k++)
|
|
if (strcmp(matches[j] + curpos, matches[k] + curpos) == 0)
|
|
free(matches[k]);
|
|
else
|
|
matches[++j] = matches[k];
|
|
matches[j + 1] = NULL;
|
|
return (matches);
|
|
}
|
|
|
|
/*
|
|
* This is passed to el_set(el, EL_ADDFN, ...) so that it's possible to
|
|
* bind a key (tab by default) to execute the function.
|
|
*/
|
|
unsigned char
|
|
sh_complete(EditLine *sel, int ch __unused)
|
|
{
|
|
return (unsigned char)fn_complete2(sel, NULL, sh_matches,
|
|
L" \t\n\"\\'`@$><=;|&{(", NULL, NULL, (size_t)100,
|
|
NULL, &((int) {0}), NULL, NULL, FN_QUOTE_MATCH);
|
|
}
|