491 lines
10 KiB
C
491 lines
10 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* $Id: histedit.c,v 1.10 1997/03/28 15:24:38 imp Exp $
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*/
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#ifndef lint
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static char const sccsid[] = "@(#)histedit.c 8.2 (Berkeley) 5/4/95";
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#endif /* not lint */
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#include <sys/param.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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#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 __P((const char *, char *, char *));
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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()
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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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out2str("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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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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el = el_init(arg0, el_in, 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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} else {
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bad:
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out2str("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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}
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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(hs)
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const char *hs;
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{
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int histsize;
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if (hist != NULL) {
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if (hs == NULL || *hs == '\0' ||
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(histsize = atoi(hs)) < 0)
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histsize = 100;
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history(hist, H_EVENT, histsize);
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}
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}
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/*
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* This command is provided since POSIX decided to standardize
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* the Korn shell fc command. Oh well...
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*/
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int
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histcmd(argc, argv)
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int argc;
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char **argv;
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{
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extern char *optarg;
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extern int optind, optopt, optreset;
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int ch;
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char *editor = NULL;
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const HistEvent *he;
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int lflg = 0, nflg = 0, rflg = 0, sflg = 0;
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int i;
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char *firststr, *laststr;
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int first, last, direction;
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char *pat = NULL, *repl; /* ksh "fc old=new" crap */
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static int active = 0;
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struct jmploc jmploc;
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struct jmploc *volatile savehandler;
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char editfile[MAXPATHLEN + 1];
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FILE *efp;
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#ifdef __GNUC__
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/* Avoid longjmp clobbering */
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(void) &editor;
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(void) &lflg;
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(void) &nflg;
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(void) &rflg;
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(void) &sflg;
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(void) &firststr;
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(void) &laststr;
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(void) &pat;
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(void) &repl;
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(void) &efp;
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(void) &argc;
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(void) &argv;
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#endif
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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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optreset = 1; optind = 1; /* initialize getopt */
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while (not_fcnumber(argv[optind]) &&
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(ch = getopt(argc, argv, ":e:lnrs")) != -1)
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switch ((char)ch) {
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case 'e':
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editor = optarg;
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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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case ':':
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error("option -%c expects argument", optopt);
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case '?':
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default:
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error("unknown option: -%c", optopt);
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}
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argc -= optind, argv += optind;
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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[0] = '\0';
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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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savehandler = handler;
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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 && argc > 0 &&
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((repl = strchr(argv[0], '=')) != NULL)) {
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pat = argv[0];
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*repl++ = '\0';
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argc--, argv++;
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}
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/*
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* determine [first] and [last]
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*/
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switch (argc) {
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case 0:
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firststr = lflg ? "-16" : "-1";
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laststr = "-1";
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break;
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case 1:
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firststr = argv[0];
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laststr = lflg ? "-1" : argv[0];
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break;
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case 2:
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firststr = argv[0];
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laststr = argv[1];
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break;
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default:
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error("too many args");
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}
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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(editfile, "%s/_shXXXXXX", _PATH_TMP);
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if ((fd = mkstemp(editfile)) < 0)
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error("can't create temporary file %s", editfile);
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if ((efp = fdopen(fd, "w")) == NULL) {
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close(fd);
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error("can't allocate stdio buffer for temp");
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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, H_FIRST);
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he = history(hist, H_NEXT_EVENT, first);
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for (;he != NULL; he = history(hist, 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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char *s = pat ?
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fc_replace(he->str, pat, repl) : (char *)he->str;
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if (sflg) {
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if (displayhist) {
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out2str(s);
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}
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evalstring(s);
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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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history(hist, H_ENTER, s);
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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 loose 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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editcmd = stalloc(strlen(editor) + strlen(editfile) + 2);
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sprintf(editcmd, "%s %s", editor, editfile);
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evalstring(editcmd); /* XXX - should use no JC command */
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INTON;
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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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return 0;
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}
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STATIC char *
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fc_replace(s, p, r)
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const char *s;
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char *p, *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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while (*r)
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STPUTC(*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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STACKSTRNUL(dest);
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dest = grabstackstr(dest);
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return (dest);
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}
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int
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not_fcnumber(s)
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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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int
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str_to_event(str, last)
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char *str;
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int last;
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{
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const HistEvent *he;
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char *s = str;
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int relative = 0;
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int i;
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he = history(hist, 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 (he != NULL && i--) {
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he = history(hist, H_NEXT);
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}
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if (he == NULL)
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he = history(hist, H_LAST);
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} else {
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he = history(hist, H_NEXT_EVENT, i);
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if (he == NULL) {
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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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he = history(hist, last ? H_FIRST : H_LAST);
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}
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}
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if (he == NULL)
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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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he = history(hist, H_PREV_STR, str);
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if (he == NULL)
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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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#else
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#include "error.h"
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int
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histcmd(argc, argv)
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int argc;
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char **argv;
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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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#endif
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