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NetBSD/bin/csh/set.c

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/* $NetBSD: set.c,v 1.22 2006/03/17 22:38:44 christos Exp $ */
/*-
* Copyright (c) 1980, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)set.c 8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: set.c,v 1.22 2006/03/17 22:38:44 christos Exp $");
#endif
#endif /* not lint */
#include <sys/types.h>
#include <stdarg.h>
#include <stdlib.h>
#ifndef SHORT_STRINGS
#include <string.h>
#endif /* SHORT_STRINGS */
#include "csh.h"
#include "extern.h"
static Char *getinx(Char *, int *);
static void asx(Char *, int, Char *);
static struct varent *getvx(Char *, int);
static Char *xset(Char *, Char ***);
static Char *operate(int, Char *, Char *);
static void putn1(int);
static struct varent *madrof(Char *, struct varent *);
static void unsetv1(struct varent *);
static void exportpath(Char **);
static void balance(struct varent *, int, int);
/*
* C Shell
*/
void
/*ARGSUSED*/
doset(Char **v, struct command *t)
{
Char op, *p, **vecp, *vp;
int subscr;
bool hadsub;
v++;
p = *v++;
if (p == 0) {
prvars();
return;
}
do {
hadsub = 0;
vp = p;
if (letter(*p))
for (; alnum(*p); p++)
continue;
if (vp == p || !letter(*vp))
stderror(ERR_NAME | ERR_VARBEGIN);
if ((p - vp) > MAXVARLEN)
stderror(ERR_NAME | ERR_VARTOOLONG);
if (*p == '[') {
hadsub++;
p = getinx(p, &subscr);
}
if ((op = *p) != '\0') {
*p++ = 0;
if (*p == 0 && *v && **v == '(')
p = *v++;
}
else if (*v && eq(*v, STRequal)) {
op = '=', v++;
if (*v)
p = *v++;
}
if (op && op != '=')
stderror(ERR_NAME | ERR_SYNTAX);
if (eq(p, STRLparen)) {
Char **e = v;
if (hadsub)
stderror(ERR_NAME | ERR_SYNTAX);
for (;;) {
if (!*e)
stderror(ERR_NAME | ERR_MISSING, ')');
if (**e == ')')
break;
e++;
}
p = *e;
*e = 0;
vecp = saveblk(v);
set1(vp, vecp, &shvhed);
*e = p;
v = e + 1;
}
else if (hadsub)
asx(vp, subscr, Strsave(p));
else
set(vp, Strsave(p));
if (eq(vp, STRpath)) {
struct varent *pt = adrof(STRpath);
if (pt == NULL)
stderror(ERR_NAME | ERR_UNDVAR);
else {
exportpath(pt->vec);
dohash(NULL, NULL);
}
}
else if (eq(vp, STRhistchars)) {
Char *pn = value(STRhistchars);
HIST = *pn++;
HISTSUB = *pn;
}
else if (eq(vp, STRuser)) {
Setenv(STRUSER, value(vp));
Setenv(STRLOGNAME, value(vp));
}
else if (eq(vp, STRwordchars)) {
word_chars = value(vp);
}
else if (eq(vp, STRterm))
Setenv(STRTERM, value(vp));
else if (eq(vp, STRhome)) {
Char *cp;
cp = Strsave(value(vp)); /* get the old value back */
/*
* convert to cononical pathname (possibly resolving symlinks)
*/
cp = dcanon(cp, cp);
set(vp, Strsave(cp)); /* have to save the new val */
/* and now mirror home with HOME */
Setenv(STRHOME, cp);
/* fix directory stack for new tilde home */
dtilde();
xfree((ptr_t)cp);
}
#ifdef FILEC
else if (eq(vp, STRfilec))
filec = 1;
#endif
} while ((p = *v++) != NULL);
}
static Char *
getinx(Char *cp, int *ip)
{
*ip = 0;
*cp++ = 0;
while (*cp && Isdigit(*cp))
*ip = *ip * 10 + *cp++ - '0';
if (*cp++ != ']')
stderror(ERR_NAME | ERR_SUBSCRIPT);
return (cp);
}
static void
asx(Char *vp, int subscr, Char *p)
{
struct varent *v;
v = getvx(vp, subscr);
xfree((ptr_t) v->vec[subscr - 1]);
v->vec[subscr - 1] = globone(p, G_APPEND);
}
static struct varent *
getvx(Char *vp, int subscr)
{
struct varent *v;
v = adrof(vp);
if (v == 0)
udvar(vp);
if (subscr < 1 || subscr > blklen(v->vec))
stderror(ERR_NAME | ERR_RANGE);
return (v);
}
void
/*ARGSUSED*/
dolet(Char **v, struct command *t)
{
Char c, op, *p, *vp;
int subscr;
bool hadsub;
v++;
p = *v++;
if (p == 0) {
prvars();
return;
}
do {
hadsub = 0;
vp = p;
if (letter(*p))
for (; alnum(*p); p++)
continue;
if (vp == p || !letter(*vp))
stderror(ERR_NAME | ERR_VARBEGIN);
if ((p - vp) > MAXVARLEN)
stderror(ERR_NAME | ERR_VARTOOLONG);
if (*p == '[') {
hadsub++;
p = getinx(p, &subscr);
}
if (*p == 0 && *v)
p = *v++;
if ((op = *p) != '\0')
*p++ = 0;
else
stderror(ERR_NAME | ERR_ASSIGN);
if (*p == '\0' && *v == NULL)
stderror(ERR_NAME | ERR_ASSIGN);
vp = Strsave(vp);
if (op == '=') {
c = '=';
p = xset(p, &v);
}
else {
c = *p++;
if (any("+-", c)) {
if (c != op || *p)
stderror(ERR_NAME | ERR_UNKNOWNOP);
p = Strsave(STR1);
}
else {
if (any("<>", op)) {
if (c != op)
stderror(ERR_NAME | ERR_UNKNOWNOP);
c = *p++;
stderror(ERR_NAME | ERR_SYNTAX);
}
if (c != '=')
stderror(ERR_NAME | ERR_UNKNOWNOP);
p = xset(p, &v);
}
}
if (op == '=') {
if (hadsub)
asx(vp, subscr, p);
else
set(vp, p);
} else if (hadsub) {
struct varent *gv = getvx(vp, subscr);
asx(vp, subscr, operate(op, gv->vec[subscr - 1], p));
}
else
set(vp, operate(op, value(vp), p));
if (eq(vp, STRpath)) {
struct varent *pt = adrof(STRpath);
if (pt == NULL)
stderror(ERR_NAME | ERR_UNDVAR);
else {
exportpath(pt->vec);
dohash(NULL, NULL);
}
}
xfree((ptr_t) vp);
if (c != '=')
xfree((ptr_t) p);
} while ((p = *v++) != NULL);
}
static Char *
xset(Char *cp, Char ***vp)
{
Char *dp;
if (*cp) {
dp = Strsave(cp);
--(*vp);
xfree((ptr_t) ** vp);
**vp = dp;
}
return (putn(expr(vp)));
}
static Char *
operate(int op, Char *vp, Char *p)
{
Char opr[2], **v, *vec[5], **vecp;
int i;
v = vec;
vecp = v;
if (op != '=') {
if (*vp)
*v++ = vp;
opr[0] = op;
opr[1] = 0;
*v++ = opr;
if (op == '<' || op == '>')
*v++ = opr;
}
*v++ = p;
*v++ = 0;
i = expr(&vecp);
if (*vecp)
stderror(ERR_NAME | ERR_EXPRESSION);
return (putn(i));
}
static Char *putp;
Char *
putn(int n)
{
static Char numbers[15];
int num = -1;
putp = numbers;
if (n < 0) {
n = -n;
*putp++ = '-';
}
if ((unsigned int)num == 0xffffU && (unsigned int)n == 0x8000U) {
*putp++ = '3';
n = 2768;
} else if ((unsigned int)num == 0xffffffffU &&
(unsigned int)n == 0x80000000U) {
*putp++ = '2';
n = 147483648;
}
putn1(n);
*putp = 0;
return (Strsave(numbers));
}
static void
putn1(int n)
{
if (n > 9)
putn1(n / 10);
*putp++ = n % 10 + '0';
}
int
getn(Char *cp)
{
int n, sign;
sign = 0;
if (cp[0] == '+' && cp[1])
cp++;
if (*cp == '-') {
sign++;
cp++;
if (!Isdigit(*cp))
stderror(ERR_NAME | ERR_BADNUM);
}
n = 0;
while (Isdigit(*cp))
n = n * 10 + *cp++ - '0';
if (*cp)
stderror(ERR_NAME | ERR_BADNUM);
return (sign ? -n : n);
}
Char *
value1(Char *var, struct varent *head)
{
struct varent *vp;
vp = adrof1(var, head);
return (vp == 0 || vp->vec[0] == 0 ? STRNULL : vp->vec[0]);
}
static struct varent *
madrof(Char *pat, struct varent *vp)
{
struct varent *vp1;
for (; vp; vp = vp->v_right) {
if (vp->v_left && (vp1 = madrof(pat, vp->v_left)))
return vp1;
if (Gmatch(vp->v_name, pat))
return vp;
}
return vp;
}
struct varent *
adrof1(Char *name, struct varent *v)
{
int cmp;
v = v->v_left;
while (v && ((cmp = *name - *v->v_name) ||
(cmp = Strcmp(name, v->v_name))))
if (cmp < 0)
v = v->v_left;
else
v = v->v_right;
return v;
}
/*
* The caller is responsible for putting value in a safe place
*/
void
set(Char *var, Char *val)
{
Char **vec;
vec = (Char **)xmalloc((size_t)(2 * sizeof(Char **)));
vec[0] = val;
vec[1] = 0;
set1(var, vec, &shvhed);
}
void
set1(Char *var, Char **vec, struct varent *head)
{
Char **oldv;
oldv = vec;
gflag = 0;
tglob(oldv);
if (gflag) {
vec = globall(oldv);
if (vec == 0) {
blkfree(oldv);
stderror(ERR_NAME | ERR_NOMATCH);
}
blkfree(oldv);
gargv = 0;
}
setq(var, vec, head);
}
void
setq(Char *name, Char **vec, struct varent *p)
{
struct varent *c;
int f;
f = 0; /* tree hangs off the header's left link */
while ((c = p->v_link[f]) != NULL) {
if ((f = *name - *c->v_name) == 0 &&
(f = Strcmp(name, c->v_name)) == 0) {
blkfree(c->vec);
goto found;
}
p = c;
f = f > 0;
}
p->v_link[f] = c = (struct varent *)xmalloc((size_t)sizeof(struct varent));
c->v_name = Strsave(name);
c->v_bal = 0;
c->v_left = c->v_right = 0;
c->v_parent = p;
balance(p, f, 0);
found:
trim(c->vec = vec);
}
void
/*ARGSUSED*/
unset(Char **v, struct command *t)
{
unset1(v, &shvhed);
#ifdef FILEC
if (adrof(STRfilec) == 0)
filec = 0;
#endif
if (adrof(STRhistchars) == 0) {
HIST = '!';
HISTSUB = '^';
}
if (adrof(STRwordchars) == 0)
word_chars = STR_WORD_CHARS;
}
void
unset1(Char *v[], struct varent *head)
{
struct varent *vp;
int cnt;
while (*++v) {
cnt = 0;
while ((vp = madrof(*v, head->v_left)) != NULL)
unsetv1(vp), cnt++;
if (cnt == 0)
setname(vis_str(*v));
}
}
void
unsetv(Char *var)
{
struct varent *vp;
if ((vp = adrof1(var, &shvhed)) == 0)
udvar(var);
unsetv1(vp);
}
static void
unsetv1(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(Char *cp)
{
set(cp, Strsave(STRNULL));
}
void
/*ARGSUSED*/
shift(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(Char **val)
{
Char exppath[BUFSIZE];
exppath[0] = 0;
if (val)
while (*val) {
if (Strlen(*val) + Strlen(exppath) + 2 > BUFSIZE) {
(void)fprintf(csherr,
"Warning: ridiculously long PATH truncated\n");
break;
}
(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(struct varent *p)
{
return (p);
}
struct varent *
rright(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(struct varent *p, int f, int 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(struct varent *p)
{
struct varent *c;
sigset_t nsigset;
int len;
if (setintr) {
sigemptyset(&nsigset);
(void)sigaddset(&nsigset, SIGINT);
(void)sigprocmask(SIG_UNBLOCK, &nsigset, NULL);
}
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;
}
}
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