/
sh.func.c
2721 lines (2454 loc) · 57.8 KB
/
sh.func.c
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/*
* sh.func.c: csh builtin functions
*/
/*-
* Copyright (c) 1980, 1991 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 "sh.h"
#include "ed.h"
#include "tw.h"
#include "tc.h"
#ifdef WINNT_NATIVE
#include "nt.const.h"
#endif /* WINNT_NATIVE */
#if defined (NLS_CATALOGS) && defined(HAVE_ICONV)
static iconv_t catgets_iconv; /* Or (iconv_t)-1 */
#endif
/*
* C shell
*/
extern int MapsAreInited;
extern int NLSMapsAreInited;
extern int GotTermCaps;
static int zlast = -1;
static void islogin (void);
static void preread (void);
static void doagain (void);
static const char *isrchx (int);
static void search (int, int, Char *);
static int getword (struct Strbuf *);
static struct wordent *histgetword (struct wordent *);
static void toend (void);
static void xecho (int, Char **);
static int islocale_var (Char *);
static void wpfree (struct whyle *);
const struct biltins *
isbfunc(struct command *t)
{
Char *cp = t->t_dcom[0];
const struct biltins *bp, *bp1, *bp2;
static struct biltins label = {"", dozip, 0, 0};
static struct biltins foregnd = {"%job", dofg1, 0, 0};
static struct biltins backgnd = {"%job &", dobg1, 0, 0};
/*
* We never match a builtin that has quoted the first
* character; this has been the traditional way to escape
* builtin commands.
*/
if (*cp & QUOTE)
return NULL;
if (*cp != ':' && lastchr(cp) == ':') {
label.bname = short2str(cp);
return (&label);
}
if (*cp == '%') {
if (t->t_dflg & F_AMPERSAND) {
t->t_dflg &= ~F_AMPERSAND;
backgnd.bname = short2str(cp);
return (&backgnd);
}
foregnd.bname = short2str(cp);
return (&foregnd);
}
#ifdef WARP
/*
* This is a perhaps kludgy way to determine if the warp builtin is to be
* acknowledged or not. If checkwarp() fails, then we are to assume that
* the warp command is invalid, and carry on as we would handle any other
* non-builtin command. -- JDK 2/4/88
*/
if (eq(STRwarp, cp) && !checkwarp()) {
return (0); /* this builtin disabled */
}
#endif /* WARP */
/*
* Binary search Bp1 is the beginning of the current search range. Bp2 is
* one past the end.
*/
for (bp1 = bfunc, bp2 = bfunc + nbfunc; bp1 < bp2;) {
int i;
bp = bp1 + ((bp2 - bp1) >> 1);
if ((i = ((char) *cp) - *bp->bname) == 0 &&
(i = StrQcmp(cp, str2short(bp->bname))) == 0)
return bp;
if (i < 0)
bp2 = bp;
else
bp1 = bp + 1;
}
#ifdef WINNT_NATIVE
return nt_check_additional_builtins(cp);
#endif /*WINNT_NATIVE*/
return (0);
}
void
func(struct command *t, const struct biltins *bp)
{
int i;
xechoit(t->t_dcom);
setname(bp->bname);
i = blklen(t->t_dcom) - 1;
if (i < bp->minargs)
stderror(ERR_NAME | ERR_TOOFEW);
if (i > bp->maxargs)
stderror(ERR_NAME | ERR_TOOMANY);
(*bp->bfunct) (t->t_dcom, t);
}
/*ARGSUSED*/
void
doonintr(Char **v, struct command *c)
{
Char *cp;
Char *vv = v[1];
USE(c);
if (parintr.sa_handler == SIG_IGN)
return;
if (setintr && intty)
stderror(ERR_NAME | ERR_TERMINAL);
cp = gointr;
gointr = 0;
xfree(cp);
if (vv == 0) {
if (setintr)
sigset_interrupting(SIGINT, queue_pintr);
else
(void) signal(SIGINT, SIG_DFL);
gointr = 0;
}
else if (eq((vv = strip(vv)), STRminus)) {
(void) signal(SIGINT, SIG_IGN);
gointr = Strsave(STRminus);
}
else {
gointr = Strsave(vv);
sigset_interrupting(SIGINT, queue_pintr);
}
}
/*ARGSUSED*/
void
donohup(Char **v, struct command *c)
{
USE(c);
USE(v);
if (intty)
stderror(ERR_NAME | ERR_TERMINAL);
if (setintr == 0) {
(void) signal(SIGHUP, SIG_IGN);
phup_disabled = 1;
#ifdef CC
submit(getpid());
#endif /* CC */
}
}
/*ARGSUSED*/
void
dohup(Char **v, struct command *c)
{
USE(c);
USE(v);
if (intty)
stderror(ERR_NAME | ERR_TERMINAL);
if (setintr == 0)
sigset_interrupting(SIGHUP, SIG_DFL);
}
/*ARGSUSED*/
void
dozip(Char **v, struct command *c)
{
USE(c);
USE(v);
}
/*ARGSUSED*/
void
dofiletest(Char **v, struct command *c)
{
Char **globbed, **fileptr, *ftest, *res;
USE(c);
if (*(ftest = *++v) != '-')
stderror(ERR_NAME | ERR_FILEINQ);
++v;
v = glob_all_or_error(v);
globbed = v;
cleanup_push(globbed, blk_cleanup);
while (*(fileptr = v++) != NULL) {
res = filetest(ftest, &fileptr, TEXP_NOGLOB);
cleanup_push(res, xfree);
xprintf("%" TCSH_S, res);
cleanup_until(res);
if (*v)
xprintf(" ");
}
xprintf("\n");
cleanup_until(globbed);
}
void
prvars(void)
{
plist(&shvhed, VAR_ALL);
}
/*ARGSUSED*/
void
doalias(Char **v, struct command *c)
{
struct varent *vp;
Char *p;
USE(c);
v++;
p = *v++;
if (p == 0)
plist(&aliases, VAR_ALL);
else if (*v == 0) {
vp = adrof1(strip(p), &aliases);
if (vp && vp->vec)
blkpr(vp->vec), xputchar('\n');
}
else {
if (eq(p, STRalias) || eq(p, STRunalias)) {
setname(short2str(p));
stderror(ERR_NAME | ERR_DANGER);
}
set1(strip(p), saveblk(v), &aliases, VAR_READWRITE);
tw_cmd_free();
}
}
/*ARGSUSED*/
void
unalias(Char **v, struct command *c)
{
USE(c);
unset1(v, &aliases);
tw_cmd_free();
}
/*ARGSUSED*/
void
dologout(Char **v, struct command *c)
{
USE(c);
USE(v);
islogin();
goodbye(NULL, NULL);
}
/*ARGSUSED*/
void
dologin(Char **v, struct command *c)
{
#ifdef WINNT_NATIVE
USE(c);
USE(v);
#else /* !WINNT_NATIVE */
char **p = short2blk(v);
USE(c);
cleanup_push((Char **)p, blk_cleanup);
islogin();
rechist(NULL, adrof(STRsavehist) != NULL);
sigaction(SIGTERM, &parterm, NULL);
(void) execv(_PATH_BIN_LOGIN, p);
(void) execv(_PATH_USRBIN_LOGIN, p);
cleanup_until((Char **)p);
untty();
xexit(1);
#endif /* !WINNT_NATIVE */
}
#ifdef NEWGRP
/*ARGSUSED*/
void
donewgrp(Char **v, struct command *c)
{
char **p;
if (chkstop == 0 && setintr)
panystop(0);
sigaction(SIGTERM, &parterm, NULL);
p = short2blk(v);
/*
* From Beto Appleton (beto@aixwiz.austin.ibm.com)
* Newgrp can take 2 arguments...
*/
(void) execv(_PATH_BIN_NEWGRP, p);
(void) execv(_PATH_USRBIN_NEWGRP, p);
blkfree((Char **) p);
untty();
xexit(1);
}
#endif /* NEWGRP */
static void
islogin(void)
{
if (chkstop == 0 && setintr)
panystop(0);
if (loginsh)
return;
stderror(ERR_NOTLOGIN);
}
void
doif(Char **v, struct command *kp)
{
int i;
Char **vv;
v++;
i = noexec ? 1 : expr(&v);
vv = v;
if (*vv == NULL)
stderror(ERR_NAME | ERR_EMPTYIF);
if (eq(*vv, STRthen)) {
if (*++vv)
stderror(ERR_NAME | ERR_IMPRTHEN);
setname(short2str(STRthen));
/*
* If expression was zero, then scan to else , otherwise just fall into
* following code.
*/
if (!i)
search(TC_IF, 0, NULL);
return;
}
/*
* Simple command attached to this if. Left shift the node in this tree,
* munging it so we can reexecute it.
*/
if (i) {
lshift(kp->t_dcom, vv - kp->t_dcom);
reexecute(kp);
donefds();
}
}
/*
* Reexecute a command, being careful not
* to redo i/o redirection, which is already set up.
*/
void
reexecute(struct command *kp)
{
kp->t_dflg &= F_SAVE;
kp->t_dflg |= F_REPEAT;
/*
* If tty is still ours to arbitrate, arbitrate it; otherwise dont even set
* pgrp's as the jobs would then have no way to get the tty (we can't give
* it to them, and our parent wouldn't know their pgrp, etc.
*/
execute(kp, (tpgrp > 0 ? tpgrp : -1), NULL, NULL, TRUE);
}
/*ARGSUSED*/
void
doelse (Char **v, struct command *c)
{
USE(c);
USE(v);
if (!noexec)
search(TC_ELSE, 0, NULL);
}
/*ARGSUSED*/
void
dogoto(Char **v, struct command *c)
{
Char *lp;
USE(c);
lp = globone(v[1], G_ERROR);
cleanup_push(lp, xfree);
if (!noexec)
gotolab(lp);
cleanup_until(lp);
}
void
gotolab(Char *lab)
{
struct whyle *wp;
/*
* While we still can, locate any unknown ends of existing loops. This
* obscure code is the WORST result of the fact that we don't really parse.
*/
zlast = TC_GOTO;
for (wp = whyles; wp; wp = wp->w_next)
if (wp->w_end.type == TCSH_F_SEEK && wp->w_end.f_seek == 0) {
search(TC_BREAK, 0, NULL);
btell(&wp->w_end);
}
else {
bseek(&wp->w_end);
}
search(TC_GOTO, 0, lab);
/*
* Eliminate loops which were exited.
*/
wfree();
}
/*ARGSUSED*/
void
doswitch(Char **v, struct command *c)
{
Char *cp, *lp;
USE(c);
v++;
if (!*v || *(*v++) != '(')
stderror(ERR_SYNTAX);
cp = **v == ')' ? STRNULL : *v++;
if (*(*v++) != ')')
v--;
if (*v)
stderror(ERR_SYNTAX);
lp = globone(cp, G_ERROR);
cleanup_push(lp, xfree);
if (!noexec)
search(TC_SWITCH, 0, lp);
cleanup_until(lp);
}
/*ARGSUSED*/
void
dobreak(Char **v, struct command *c)
{
USE(v);
USE(c);
if (whyles == NULL)
stderror(ERR_NAME | ERR_NOTWHILE);
if (!noexec)
toend();
}
/*ARGSUSED*/
void
doexit(Char **v, struct command *c)
{
USE(c);
if (chkstop == 0 && (intty || intact) && evalvec == 0)
panystop(0);
/*
* Don't DEMAND parentheses here either.
*/
v++;
if (*v) {
setstrstatus(putn(expr(&v)));
if (*v)
stderror(ERR_NAME | ERR_EXPRESSION);
}
btoeof();
#if 0
if (intty)
#endif
/* Always close, why only on ttys? */
xclose(SHIN);
}
/*ARGSUSED*/
void
doforeach(Char **v, struct command *c)
{
Char *cp, *sp;
struct whyle *nwp;
int gflag;
USE(c);
v++;
cp = sp = strip(*v);
if (!letter(*cp))
stderror(ERR_NAME | ERR_VARBEGIN);
do {
cp++;
} while (alnum(*cp));
if (*cp != '\0')
stderror(ERR_NAME | ERR_VARALNUM);
cp = *v++;
if (v[0][0] != '(' || v[blklen(v) - 1][0] != ')')
stderror(ERR_NAME | ERR_NOPAREN);
v++;
gflag = tglob(v);
if (gflag) {
v = globall(v, gflag);
if (v == 0 && !noexec)
stderror(ERR_NAME | ERR_NOMATCH);
}
else {
v = saveblk(v);
trim(v);
}
nwp = xcalloc(1, sizeof *nwp);
nwp->w_fe = nwp->w_fe0 = v;
btell(&nwp->w_start);
nwp->w_fename = Strsave(cp);
nwp->w_next = whyles;
nwp->w_end.type = TCSH_F_SEEK;
whyles = nwp;
/*
* Pre-read the loop so as to be more comprehensible to a terminal user.
*/
zlast = TC_FOREACH;
if (intty)
preread();
if (!noexec)
doagain();
}
/*ARGSUSED*/
void
dowhile(Char **v, struct command *c)
{
int status;
int again = whyles != 0 &&
SEEKEQ(&whyles->w_start, &lineloc) &&
whyles->w_fename == 0;
USE(c);
v++;
/*
* Implement prereading here also, taking care not to evaluate the
* expression before the loop has been read up from a terminal.
*/
if (noexec)
status = 0;
else if (intty && !again)
status = !exp0(&v, 1);
else
status = !expr(&v);
if (*v && !noexec)
stderror(ERR_NAME | ERR_EXPRESSION);
if (!again) {
struct whyle *nwp = xcalloc(1, sizeof(*nwp));
nwp->w_start = lineloc;
nwp->w_end.type = TCSH_F_SEEK;
nwp->w_end.f_seek = 0;
nwp->w_end.a_seek = 0;
nwp->w_next = whyles;
whyles = nwp;
zlast = TC_WHILE;
if (intty) {
/*
* The tty preread
*/
preread();
doagain();
return;
}
}
if (status)
/* We ain't gonna loop no more, no more! */
toend();
}
static void
preread(void)
{
int old_pintr_disabled;
whyles->w_end.type = TCSH_I_SEEK;
if (setintr)
pintr_push_enable(&old_pintr_disabled);
search(TC_BREAK, 0, NULL); /* read the expression in */
if (setintr)
cleanup_until(&old_pintr_disabled);
btell(&whyles->w_end);
}
/*ARGSUSED*/
void
doend(Char **v, struct command *c)
{
USE(v);
USE(c);
if (!whyles)
stderror(ERR_NAME | ERR_NOTWHILE);
btell(&whyles->w_end);
if (!noexec)
doagain();
}
/*ARGSUSED*/
void
docontin(Char **v, struct command *c)
{
USE(v);
USE(c);
if (!whyles)
stderror(ERR_NAME | ERR_NOTWHILE);
if (!noexec)
doagain();
}
static void
doagain(void)
{
/* Repeating a while is simple */
if (whyles->w_fename == 0) {
bseek(&whyles->w_start);
return;
}
/*
* The foreach variable list actually has a spurious word ")" at the end of
* the w_fe list. Thus we are at the of the list if one word beyond this
* is 0.
*/
if (!whyles->w_fe[1]) {
dobreak(NULL, NULL);
return;
}
setv(whyles->w_fename, quote(Strsave(*whyles->w_fe++)), VAR_READWRITE);
bseek(&whyles->w_start);
}
void
dorepeat(Char **v, struct command *kp)
{
int i = 1;
do {
i *= getn(v[1]);
lshift(v, 2);
} while (v[0] != NULL && Strcmp(v[0], STRrepeat) == 0);
if (noexec)
i = 1;
if (setintr) {
pintr_disabled++;
cleanup_push(&pintr_disabled, disabled_cleanup);
}
while (i > 0) {
if (setintr && pintr_disabled == 1) {
cleanup_until(&pintr_disabled);
pintr_disabled++;
cleanup_push(&pintr_disabled, disabled_cleanup);
}
reexecute(kp);
--i;
}
if (setintr && pintr_disabled == 1)
cleanup_until(&pintr_disabled);
donefds();
}
/*ARGSUSED*/
void
doswbrk(Char **v, struct command *c)
{
USE(v);
USE(c);
if (!noexec)
search(TC_BRKSW, 0, NULL);
}
int
srchx(Char *cp)
{
struct srch *sp, *sp1, *sp2;
int i;
/*
* Ignore keywords inside heredocs
*/
if (inheredoc)
return -1;
/*
* Binary search Sp1 is the beginning of the current search range. Sp2 is
* one past the end.
*/
for (sp1 = srchn, sp2 = srchn + nsrchn; sp1 < sp2;) {
sp = sp1 + ((sp2 - sp1) >> 1);
if ((i = *cp - *sp->s_name) == 0 &&
(i = Strcmp(cp, str2short(sp->s_name))) == 0)
return sp->s_value;
if (i < 0)
sp2 = sp;
else
sp1 = sp + 1;
}
return (-1);
}
static const char *
isrchx(int n)
{
struct srch *sp, *sp2;
for (sp = srchn, sp2 = srchn + nsrchn; sp < sp2; sp++)
if (sp->s_value == n)
return (sp->s_name);
return ("");
}
static int Stype;
static Char *Sgoal;
static void
search(int type, int level, Char *goal)
{
struct Strbuf word = Strbuf_INIT;
Char *cp;
struct whyle *wp;
int wlevel = 0;
struct wordent *histent = NULL, *ohistent = NULL;
Stype = type;
Sgoal = goal;
if (type == TC_GOTO) {
struct Ain a;
a.type = TCSH_F_SEEK;
a.f_seek = 0;
a.a_seek = 0;
bseek(&a);
}
cleanup_push(&word, Strbuf_cleanup);
do {
if (intty) {
histent = xmalloc(sizeof(*histent));
ohistent = xmalloc(sizeof(*histent));
ohistent->word = STRNULL;
ohistent->next = histent;
histent->prev = ohistent;
}
if (intty && fseekp == feobp && aret == TCSH_F_SEEK)
printprompt(1, isrchx(type == TC_BREAK ? zlast : type));
/* xprintf("? "), flush(); */
(void) getword(&word);
Strbuf_terminate(&word);
if (intty && Strlen(word.s) > 0) {
histent->word = Strsave(word.s);
histent->next = xmalloc(sizeof(*histent));
histent->next->prev = histent;
histent = histent->next;
}
switch (srchx(word.s)) {
case TC_ELSE:
if (level == 0 && type == TC_IF)
goto end;
break;
case TC_IF:
while (getword(&word)) {
if (intty) {
histent->word = Strsave(word.s);
histent->next = xmalloc(sizeof(*histent));
histent->next->prev = histent;
histent = histent->next;
}
continue;
}
if ((type == TC_IF || type == TC_ELSE) &&
eq(word.s, STRthen))
level++;
break;
case TC_ENDIF:
if (type == TC_IF || type == TC_ELSE)
level--;
break;
case TC_FOREACH:
case TC_WHILE:
wlevel++;
if (type == TC_BREAK)
level++;
break;
case TC_END:
if (type == TC_BRKSW) {
if (wlevel == 0) {
wp = whyles;
if (wp) {
whyles = wp->w_next;
wpfree(wp);
}
}
}
if (type == TC_BREAK)
level--;
wlevel--;
break;
case TC_SWITCH:
if (type == TC_SWITCH || type == TC_BRKSW)
level++;
break;
case TC_ENDSW:
if (type == TC_SWITCH || type == TC_BRKSW)
level--;
break;
case TC_LABEL:
if (type == TC_GOTO && getword(&word) && eq(word.s, goal))
level = -1;
break;
default:
if (type != TC_GOTO && (type != TC_SWITCH || level != 0))
break;
if (word.len == 0 || word.s[word.len - 1] != ':')
break;
word.s[--word.len] = 0;
if ((type == TC_GOTO && eq(word.s, goal)) ||
(type == TC_SWITCH && eq(word.s, STRdefault)))
level = -1;
break;
case TC_CASE:
if (type != TC_SWITCH || level != 0)
break;
(void) getword(&word);
if (word.len != 0 && word.s[word.len - 1] == ':')
word.s[--word.len] = 0;
cp = strip(Dfix1(word.s));
cleanup_push(cp, xfree);
if (Gmatch(goal, cp))
level = -1;
cleanup_until(cp);
break;
case TC_DEFAULT:
if (type == TC_SWITCH && level == 0)
level = -1;
break;
}
if (intty) {
ohistent->prev = histgetword(histent);
ohistent->prev->next = ohistent;
savehist(ohistent, 0);
freelex(ohistent);
xfree(ohistent);
} else
(void) getword(NULL);
} while (level >= 0);
end:
cleanup_until(&word);
}
static struct wordent *
histgetword(struct wordent *histent)
{
int first;
eChar c, d;
int e;
struct Strbuf *tmp;
tmp = xmalloc(sizeof(*tmp));
tmp->size = 0;
tmp->s = NULL;
c = readc(1);
d = 0;
e = 0;
for (;;) {
tmp->len = 0;
Strbuf_terminate (tmp);
while (c == ' ' || c == '\t')
c = readc(1);
if (c == '#')
do
c = readc(1);
while (c != CHAR_ERR && c != '\n');
if (c == CHAR_ERR)
goto past;
if (c == '\n')
goto nl;
unreadc(c);
first = 1;
do {
e = (c == '\\');
c = readc(1);
if (c == '\\' && !e) {
if ((c = readc(1)) == '\n') {
e = 1;
c = ' ';
} else {
unreadc(c);
c = '\\';
}
}
if ((c == '\'' || c == '"') && !e) {
if (d == 0)
d = c;
else if (d == c)
d = 0;
}
if (c == CHAR_ERR)
goto past;
Strbuf_append1(tmp, (Char) c);
if (!first && !d && c == '(' && !e) {
break;
}
first = 0;
} while (d || e || (c != ' ' && c != '\t' && c != '\n'));
tmp->len--;
if (tmp->len) {
Strbuf_terminate(tmp);
histent->word = Strsave(tmp->s);
histent->next = xmalloc(sizeof (*histent));
histent->next->prev = histent;
histent = histent->next;
}
if (c == '\n') {
nl:
tmp->len = 0;
Strbuf_append1(tmp, (Char) c);
Strbuf_terminate(tmp);
histent->word = Strsave(tmp->s);
return histent;
}
}
past:
switch (Stype) {
case TC_IF:
stderror(ERR_NAME | ERR_NOTFOUND, "then/endif");
break;
case TC_ELSE:
stderror(ERR_NAME | ERR_NOTFOUND, "endif");
break;
case TC_BRKSW:
case TC_SWITCH:
stderror(ERR_NAME | ERR_NOTFOUND, "endsw");
break;
case TC_BREAK:
stderror(ERR_NAME | ERR_NOTFOUND, "end");
break;
case TC_GOTO:
setname(short2str(Sgoal));
stderror(ERR_NAME | ERR_NOTFOUND, "label");
break;
default:
break;
}
/* NOTREACHED */
return NULL;