852 lines
16 KiB
C
852 lines
16 KiB
C
/*-
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* Copyright (c) 1980, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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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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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)set.c 8.1 (Berkeley) 5/31/93";
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#else
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static const char rcsid[] =
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"$Id: set.c,v 1.7 1997/08/07 21:42:16 steve Exp $";
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <stdlib.h>
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#ifndef SHORT_STRINGS
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#include <string.h>
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#endif /* SHORT_STRINGS */
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#if __STDC__
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# include <stdarg.h>
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#else
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# include <varargs.h>
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#endif
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#include <unistd.h>
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#include "csh.h"
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#include "extern.h"
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static Char *getinx __P((Char *, int *));
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static void asx __P((Char *, int, Char *));
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static struct varent
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*getvx __P((Char *, int));
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static Char *xset __P((Char *, Char ***));
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static Char *operate __P((int, Char *, Char *));
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static void putn1 __P((int));
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static struct varent
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*madrof __P((Char *, struct varent *));
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static void unsetv1 __P((struct varent *));
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static void exportpath __P((Char **));
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static void balance __P((struct varent *, int, int));
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/*
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* C Shell
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*/
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void
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/*ARGSUSED*/
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doset(v, t)
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Char **v;
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struct command *t;
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{
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Char *p;
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Char *vp, op;
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Char **vecp;
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bool hadsub;
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int subscr;
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v++;
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p = *v++;
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if (p == 0) {
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prvars();
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return;
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}
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do {
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hadsub = 0;
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vp = p;
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if (letter(*p))
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for (; alnum(*p); p++)
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continue;
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if (vp == p || !letter(*vp))
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stderror(ERR_NAME | ERR_VARBEGIN);
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if ((p - vp) > MAXVARLEN) {
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stderror(ERR_NAME | ERR_VARTOOLONG);
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return;
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}
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if (*p == '[') {
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hadsub++;
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p = getinx(p, &subscr);
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}
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if ((op = *p) != '\0') {
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*p++ = 0;
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if (*p == 0 && *v && **v == '(')
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p = *v++;
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}
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else if (*v && eq(*v, STRequal)) {
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op = '=', v++;
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if (*v)
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p = *v++;
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}
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if (op && op != '=')
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stderror(ERR_NAME | ERR_SYNTAX);
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if (eq(p, STRLparen)) {
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Char **e = v;
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if (hadsub)
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stderror(ERR_NAME | ERR_SYNTAX);
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for (;;) {
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if (!*e)
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stderror(ERR_NAME | ERR_MISSING, ')');
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if (**e == ')')
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break;
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e++;
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}
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p = *e;
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*e = 0;
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vecp = saveblk(v);
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set1(vp, vecp, &shvhed);
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*e = p;
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v = e + 1;
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}
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else if (hadsub)
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asx(vp, subscr, Strsave(p));
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else
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set(vp, Strsave(p));
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if (eq(vp, STRpath)) {
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exportpath(adrof(STRpath)->vec);
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dohash(NULL, NULL);
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}
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else if (eq(vp, STRhistchars)) {
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Char *pn = value(STRhistchars);
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HIST = *pn++;
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HISTSUB = *pn;
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}
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else if (eq(vp, STRuser)) {
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Setenv(STRUSER, value(vp));
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Setenv(STRLOGNAME, value(vp));
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}
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else if (eq(vp, STRwordchars)) {
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word_chars = value(vp);
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}
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else if (eq(vp, STRterm))
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Setenv(STRTERM, value(vp));
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else if (eq(vp, STRhome)) {
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Char *cp;
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cp = Strsave(value(vp)); /* get the old value back */
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/*
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* convert to cononical pathname (possibly resolving symlinks)
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*/
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cp = dcanon(cp, cp);
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set(vp, Strsave(cp)); /* have to save the new val */
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/* and now mirror home with HOME */
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Setenv(STRHOME, cp);
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/* fix directory stack for new tilde home */
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dtilde();
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xfree((ptr_t) cp);
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}
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#ifdef FILEC
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else if (eq(vp, STRfilec))
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filec = 1;
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#endif
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} while ((p = *v++) != NULL);
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}
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static Char *
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getinx(cp, ip)
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Char *cp;
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int *ip;
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{
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*ip = 0;
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*cp++ = 0;
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while (*cp && Isdigit(*cp))
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*ip = *ip * 10 + *cp++ - '0';
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if (*cp++ != ']')
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stderror(ERR_NAME | ERR_SUBSCRIPT);
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return (cp);
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}
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static void
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asx(vp, subscr, p)
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Char *vp;
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int subscr;
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Char *p;
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{
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struct varent *v = getvx(vp, subscr);
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xfree((ptr_t) v->vec[subscr - 1]);
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v->vec[subscr - 1] = globone(p, G_APPEND);
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}
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static struct varent *
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getvx(vp, subscr)
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Char *vp;
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int subscr;
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{
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struct varent *v = adrof(vp);
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if (v == 0)
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udvar(vp);
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if (subscr < 1 || subscr > blklen(v->vec))
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stderror(ERR_NAME | ERR_RANGE);
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return (v);
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}
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void
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/*ARGSUSED*/
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dolet(v, t)
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Char **v;
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struct command *t;
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{
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Char *p;
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Char *vp, c, op;
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bool hadsub;
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int subscr;
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v++;
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p = *v++;
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if (p == 0) {
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prvars();
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return;
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}
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do {
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hadsub = 0;
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vp = p;
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if (letter(*p))
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for (; alnum(*p); p++)
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continue;
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if (vp == p || !letter(*vp))
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stderror(ERR_NAME | ERR_VARBEGIN);
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if ((p - vp) > MAXVARLEN)
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stderror(ERR_NAME | ERR_VARTOOLONG);
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if (*p == '[') {
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hadsub++;
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p = getinx(p, &subscr);
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}
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if (*p == 0 && *v)
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p = *v++;
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if ((op = *p) != '\0')
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*p++ = 0;
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else
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stderror(ERR_NAME | ERR_ASSIGN);
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if (*p == '\0' && *v == NULL)
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stderror(ERR_NAME | ERR_ASSIGN);
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vp = Strsave(vp);
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if (op == '=') {
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c = '=';
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p = xset(p, &v);
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}
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else {
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c = *p++;
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if (any("+-", c)) {
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if (c != op || *p)
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stderror(ERR_NAME | ERR_UNKNOWNOP);
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p = Strsave(STR1);
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}
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else {
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if (any("<>", op)) {
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if (c != op)
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stderror(ERR_NAME | ERR_UNKNOWNOP);
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c = *p++;
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stderror(ERR_NAME | ERR_SYNTAX);
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}
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if (c != '=')
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stderror(ERR_NAME | ERR_UNKNOWNOP);
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p = xset(p, &v);
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}
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}
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if (op == '=')
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if (hadsub)
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asx(vp, subscr, p);
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else
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set(vp, p);
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else if (hadsub) {
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struct varent *gv = getvx(vp, subscr);
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asx(vp, subscr, operate(op, gv->vec[subscr - 1], p));
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}
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else
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set(vp, operate(op, value(vp), p));
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if (eq(vp, STRpath)) {
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exportpath(adrof(STRpath)->vec);
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dohash(NULL, NULL);
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}
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xfree((ptr_t) vp);
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if (c != '=')
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xfree((ptr_t) p);
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} while ((p = *v++) != NULL);
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}
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static Char *
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xset(cp, vp)
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Char *cp, ***vp;
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{
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Char *dp;
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if (*cp) {
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dp = Strsave(cp);
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--(*vp);
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xfree((ptr_t) ** vp);
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**vp = dp;
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}
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return (putn(expr(vp)));
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}
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static Char *
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operate(op, vp, p)
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int op;
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Char *vp, *p;
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{
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Char opr[2];
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Char *vec[5];
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Char **v = vec;
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Char **vecp = v;
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int i;
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if (op != '=') {
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if (*vp)
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*v++ = vp;
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opr[0] = op;
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opr[1] = 0;
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*v++ = opr;
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if (op == '<' || op == '>')
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*v++ = opr;
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}
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*v++ = p;
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*v++ = 0;
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i = expr(&vecp);
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if (*vecp)
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stderror(ERR_NAME | ERR_EXPRESSION);
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return (putn(i));
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}
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static Char *putp;
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Char *
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putn(n)
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int n;
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{
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int num;
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static Char number[15];
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putp = number;
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if (n < 0) {
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n = -n;
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*putp++ = '-';
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}
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num = 2; /* confuse lint */
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if (sizeof(int) == num && ((unsigned int) n) == 0x8000) {
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*putp++ = '3';
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n = 2768;
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#ifdef pdp11
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}
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#else
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}
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else {
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num = 4; /* confuse lint */
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if (sizeof(int) == num && ((unsigned int) n) == 0x80000000) {
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*putp++ = '2';
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n = 147483648;
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}
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}
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#endif
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putn1(n);
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*putp = 0;
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return (Strsave(number));
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}
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static void
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putn1(n)
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int n;
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{
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if (n > 9)
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putn1(n / 10);
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*putp++ = n % 10 + '0';
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}
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int
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getn(cp)
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Char *cp;
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{
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int n;
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int sign;
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sign = 0;
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if (cp[0] == '+' && cp[1])
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cp++;
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if (*cp == '-') {
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sign++;
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cp++;
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if (!Isdigit(*cp))
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stderror(ERR_NAME | ERR_BADNUM);
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}
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n = 0;
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while (Isdigit(*cp))
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n = n * 10 + *cp++ - '0';
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if (*cp)
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stderror(ERR_NAME | ERR_BADNUM);
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return (sign ? -n : n);
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}
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Char *
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value1(var, head)
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Char *var;
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struct varent *head;
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{
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struct varent *vp;
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vp = adrof1(var, head);
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return (vp == 0 || vp->vec[0] == 0 ? STRNULL : vp->vec[0]);
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}
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static struct varent *
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madrof(pat, vp)
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Char *pat;
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struct varent *vp;
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{
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struct varent *vp1;
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for (; vp; vp = vp->v_right) {
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if (vp->v_left && (vp1 = madrof(pat, vp->v_left)))
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return vp1;
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if (Gmatch(vp->v_name, pat))
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return vp;
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}
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return vp;
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}
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struct varent *
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adrof1(name, v)
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Char *name;
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struct varent *v;
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{
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int cmp;
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v = v->v_left;
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while (v && ((cmp = *name - *v->v_name) ||
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(cmp = Strcmp(name, v->v_name))))
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if (cmp < 0)
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v = v->v_left;
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else
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v = v->v_right;
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return v;
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}
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/*
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* The caller is responsible for putting value in a safe place
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*/
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void
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set(var, val)
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Char *var, *val;
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{
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Char **vec = (Char **) xmalloc((size_t) (2 * sizeof(Char **)));
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vec[0] = val;
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vec[1] = 0;
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set1(var, vec, &shvhed);
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}
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void
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set1(var, vec, head)
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Char *var, **vec;
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struct varent *head;
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{
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Char **oldv = vec;
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gflag = 0;
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tglob(oldv);
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if (gflag) {
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vec = globall(oldv);
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if (vec == 0) {
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blkfree(oldv);
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stderror(ERR_NAME | ERR_NOMATCH);
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return;
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}
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blkfree(oldv);
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gargv = 0;
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}
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setq(var, vec, head);
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}
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void
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setq(name, vec, p)
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Char *name, **vec;
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struct varent *p;
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{
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struct varent *c;
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int f;
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f = 0; /* tree hangs off the header's left link */
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while ((c = p->v_link[f]) != NULL) {
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if ((f = *name - *c->v_name) == 0 &&
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(f = Strcmp(name, c->v_name)) == 0) {
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blkfree(c->vec);
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goto found;
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}
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p = c;
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f = f > 0;
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}
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p->v_link[f] = c = (struct varent *) xmalloc((size_t) sizeof(struct varent));
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c->v_name = Strsave(name);
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c->v_bal = 0;
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c->v_left = c->v_right = 0;
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c->v_parent = p;
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balance(p, f, 0);
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found:
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trim(c->vec = vec);
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}
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void
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/*ARGSUSED*/
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unset(v, t)
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Char **v;
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struct command *t;
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{
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unset1(v, &shvhed);
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#ifdef FILEC
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if (adrof(STRfilec) == 0)
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filec = 0;
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#endif
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if (adrof(STRhistchars) == 0) {
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HIST = '!';
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HISTSUB = '^';
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}
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if (adrof(STRwordchars) == 0)
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word_chars = STR_WORD_CHARS;
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}
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void
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unset1(v, head)
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Char *v[];
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struct varent *head;
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{
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struct varent *vp;
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int cnt;
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while (*++v) {
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cnt = 0;
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while ((vp = madrof(*v, head->v_left)) != NULL)
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unsetv1(vp), cnt++;
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if (cnt == 0)
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setname(vis_str(*v));
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}
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}
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void
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unsetv(var)
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Char *var;
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{
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struct varent *vp;
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if ((vp = adrof1(var, &shvhed)) == 0)
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udvar(var);
|
|
unsetv1(vp);
|
|
}
|
|
|
|
static void
|
|
unsetv1(p)
|
|
struct varent *p;
|
|
{
|
|
struct varent *c, *pp;
|
|
int f;
|
|
|
|
/*
|
|
* Free associated memory first to avoid complications.
|
|
*/
|
|
blkfree(p->vec);
|
|
xfree((ptr_t) p->v_name);
|
|
/*
|
|
* If p is missing one child, then we can move the other into where p is.
|
|
* Otherwise, we find the predecessor of p, which is guaranteed to have no
|
|
* right child, copy it into p, and move it's left child into it.
|
|
*/
|
|
if (p->v_right == 0)
|
|
c = p->v_left;
|
|
else if (p->v_left == 0)
|
|
c = p->v_right;
|
|
else {
|
|
for (c = p->v_left; c->v_right; c = c->v_right)
|
|
continue;
|
|
p->v_name = c->v_name;
|
|
p->vec = c->vec;
|
|
p = c;
|
|
c = p->v_left;
|
|
}
|
|
/*
|
|
* Move c into where p is.
|
|
*/
|
|
pp = p->v_parent;
|
|
f = pp->v_right == p;
|
|
if ((pp->v_link[f] = c) != NULL)
|
|
c->v_parent = pp;
|
|
/*
|
|
* Free the deleted node, and rebalance.
|
|
*/
|
|
xfree((ptr_t) p);
|
|
balance(pp, f, 1);
|
|
}
|
|
|
|
void
|
|
setNS(cp)
|
|
Char *cp;
|
|
{
|
|
set(cp, Strsave(STRNULL));
|
|
}
|
|
|
|
void
|
|
/*ARGSUSED*/
|
|
shift(v, t)
|
|
Char **v;
|
|
struct command *t;
|
|
{
|
|
struct varent *argv;
|
|
Char *name;
|
|
|
|
v++;
|
|
name = *v;
|
|
if (name == 0)
|
|
name = STRargv;
|
|
else
|
|
(void) strip(name);
|
|
argv = adrof(name);
|
|
if (argv == 0)
|
|
udvar(name);
|
|
if (argv->vec[0] == 0)
|
|
stderror(ERR_NAME | ERR_NOMORE);
|
|
lshift(argv->vec, 1);
|
|
}
|
|
|
|
static void
|
|
exportpath(val)
|
|
Char **val;
|
|
{
|
|
Char exppath[BUFSIZ];
|
|
|
|
exppath[0] = 0;
|
|
if (val)
|
|
while (*val) {
|
|
if (Strlen(*val) + Strlen(exppath) + 2 > BUFSIZ) {
|
|
(void) fprintf(csherr,
|
|
"Warning: ridiculously long PATH truncated\n");
|
|
break;
|
|
}
|
|
if (**val != '/' && (euid == 0 || uid == 0) &&
|
|
(intact || (intty && isatty(SHOUT))))
|
|
(void) fprintf(csherr,
|
|
"Warning: exported path contains relative components.\n");
|
|
(void) Strcat(exppath, *val++);
|
|
if (*val == 0 || eq(*val, STRRparen))
|
|
break;
|
|
(void) Strcat(exppath, STRcolon);
|
|
}
|
|
Setenv(STRPATH, exppath);
|
|
}
|
|
|
|
#ifndef lint
|
|
/*
|
|
* Lint thinks these have null effect
|
|
*/
|
|
/* macros to do single rotations on node p */
|
|
#define rright(p) (\
|
|
t = (p)->v_left,\
|
|
(t)->v_parent = (p)->v_parent,\
|
|
((p)->v_left = t->v_right) ? (t->v_right->v_parent = (p)) : 0,\
|
|
(t->v_right = (p))->v_parent = t,\
|
|
(p) = t)
|
|
#define rleft(p) (\
|
|
t = (p)->v_right,\
|
|
(t)->v_parent = (p)->v_parent,\
|
|
((p)->v_right = t->v_left) ? (t->v_left->v_parent = (p)) : 0,\
|
|
(t->v_left = (p))->v_parent = t,\
|
|
(p) = t)
|
|
#else
|
|
struct varent *
|
|
rleft(p)
|
|
struct varent *p;
|
|
{
|
|
return (p);
|
|
}
|
|
struct varent *
|
|
rright(p)
|
|
struct varent *p;
|
|
{
|
|
return (p);
|
|
}
|
|
|
|
#endif /* ! lint */
|
|
|
|
|
|
/*
|
|
* Rebalance a tree, starting at p and up.
|
|
* F == 0 means we've come from p's left child.
|
|
* D == 1 means we've just done a delete, otherwise an insert.
|
|
*/
|
|
static void
|
|
balance(p, f, d)
|
|
struct varent *p;
|
|
int f, d;
|
|
{
|
|
struct varent *pp;
|
|
|
|
#ifndef lint
|
|
struct varent *t; /* used by the rotate macros */
|
|
|
|
#endif
|
|
int ff;
|
|
|
|
/*
|
|
* Ok, from here on, p is the node we're operating on; pp is it's parent; f
|
|
* is the branch of p from which we have come; ff is the branch of pp which
|
|
* is p.
|
|
*/
|
|
for (; (pp = p->v_parent) != NULL; p = pp, f = ff) {
|
|
ff = pp->v_right == p;
|
|
if (f ^ d) { /* right heavy */
|
|
switch (p->v_bal) {
|
|
case -1: /* was left heavy */
|
|
p->v_bal = 0;
|
|
break;
|
|
case 0: /* was balanced */
|
|
p->v_bal = 1;
|
|
break;
|
|
case 1: /* was already right heavy */
|
|
switch (p->v_right->v_bal) {
|
|
case 1: /* sigle rotate */
|
|
pp->v_link[ff] = rleft(p);
|
|
p->v_left->v_bal = 0;
|
|
p->v_bal = 0;
|
|
break;
|
|
case 0: /* single rotate */
|
|
pp->v_link[ff] = rleft(p);
|
|
p->v_left->v_bal = 1;
|
|
p->v_bal = -1;
|
|
break;
|
|
case -1: /* double rotate */
|
|
(void) rright(p->v_right);
|
|
pp->v_link[ff] = rleft(p);
|
|
p->v_left->v_bal =
|
|
p->v_bal < 1 ? 0 : -1;
|
|
p->v_right->v_bal =
|
|
p->v_bal > -1 ? 0 : 1;
|
|
p->v_bal = 0;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
else { /* left heavy */
|
|
switch (p->v_bal) {
|
|
case 1: /* was right heavy */
|
|
p->v_bal = 0;
|
|
break;
|
|
case 0: /* was balanced */
|
|
p->v_bal = -1;
|
|
break;
|
|
case -1: /* was already left heavy */
|
|
switch (p->v_left->v_bal) {
|
|
case -1: /* single rotate */
|
|
pp->v_link[ff] = rright(p);
|
|
p->v_right->v_bal = 0;
|
|
p->v_bal = 0;
|
|
break;
|
|
case 0: /* signle rotate */
|
|
pp->v_link[ff] = rright(p);
|
|
p->v_right->v_bal = -1;
|
|
p->v_bal = 1;
|
|
break;
|
|
case 1: /* double rotate */
|
|
(void) rleft(p->v_left);
|
|
pp->v_link[ff] = rright(p);
|
|
p->v_left->v_bal =
|
|
p->v_bal < 1 ? 0 : -1;
|
|
p->v_right->v_bal =
|
|
p->v_bal > -1 ? 0 : 1;
|
|
p->v_bal = 0;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* If from insert, then we terminate when p is balanced. If from
|
|
* delete, then we terminate when p is unbalanced.
|
|
*/
|
|
if ((p->v_bal == 0) ^ d)
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
plist(p)
|
|
struct varent *p;
|
|
{
|
|
struct varent *c;
|
|
int len;
|
|
|
|
if (setintr)
|
|
(void) sigsetmask(sigblock(0) & ~sigmask(SIGINT));
|
|
|
|
for (;;) {
|
|
while (p->v_left)
|
|
p = p->v_left;
|
|
x:
|
|
if (p->v_parent == 0) /* is it the header? */
|
|
return;
|
|
len = blklen(p->vec);
|
|
(void) fprintf(cshout, "%s\t", short2str(p->v_name));
|
|
if (len != 1)
|
|
(void) fputc('(', cshout);
|
|
blkpr(cshout, p->vec);
|
|
if (len != 1)
|
|
(void) fputc(')', cshout);
|
|
(void) fputc('\n', cshout);
|
|
if (p->v_right) {
|
|
p = p->v_right;
|
|
continue;
|
|
}
|
|
do {
|
|
c = p;
|
|
p = p->v_parent;
|
|
} while (p->v_right == c);
|
|
goto x;
|
|
}
|
|
}
|