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freebsd-skq/contrib/tcsh/sh.lex.c
brooks f7262b6430 Update tcsh to git revision 83c5be0 bringing in a number of bug fixes. 
Reported by:	sobomax
MFC after:	3 days
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D22099
2019-10-21 21:21:34 +00:00

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/*
* sh.lex.c: Lexical analysis into tokens
*/
/*-
* 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 <assert.h>
/* #define DEBUG_INP */
/* #define DEBUG_SEEK */
/*
* C shell
*/
#define FLAG_G 1
#define FLAG_A 2
/*
* These lexical routines read input and form lists of words.
* There is some involved processing here, because of the complications
* of input buffering, and especially because of history substitution.
*/
static Char *word (int);
static eChar getC1 (int);
static void getdol (void);
static void getexcl (Char);
static struct Hist *findev (Char *, int);
static void setexclp (Char *);
static eChar bgetc (void);
static void balloc (int);
static void bfree (void);
static struct wordent *gethent (Char);
static int matchs (const Char *, const Char *);
static int getsel (int *, int *, int);
static struct wordent *getsub (struct wordent *);
static Char *subword (Char *, Char, int *, size_t *);
static struct wordent *dosub (Char, struct wordent *, int);
/*
* Peekc is a peek character for getC, peekread for readc.
* There is a subtlety here in many places... history routines
* will read ahead and then insert stuff into the input stream.
* If they push back a character then they must push it behind
* the text substituted by the history substitution. On the other
* hand in several places we need 2 peek characters. To make this
* all work, the history routines read with getC, and make use both
* of ungetC and unreadc. The key observation is that the state
* of getC at the call of a history reference is such that calls
* to getC from the history routines will always yield calls of
* readc, unless this peeking is involved. That is to say that during
* getexcl the variables lap, exclp, and exclnxt are all zero.
*
* Getdol invokes history substitution, hence the extra peek, peekd,
* which it can ungetD to be before history substitutions.
*/
static Char peekc = 0, peekd = 0;
static Char peekread = 0;
/* (Tail of) current word from ! subst */
static Char *exclp = NULL;
/* The rest of the ! subst words */
static struct wordent *exclnxt = NULL;
/* Count of remaining words in ! subst */
static int exclc = 0;
/* "Globp" for alias resubstitution */
int aret = TCSH_F_SEEK;
/*
* Labuf implements a general buffer for lookahead during lexical operations.
* Text which is to be placed in the input stream can be stuck here.
* We stick parsed ahead $ constructs during initial input,
* process id's from `$$', and modified variable values (from qualifiers
* during expansion in sh.dol.c) here.
*/
struct Strbuf labuf; /* = Strbuf_INIT; */
/*
* Lex returns to its caller not only a wordlist (as a "var" parameter)
* but also whether a history substitution occurred. This is used in
* the main (process) routine to determine whether to echo, and also
* when called by the alias routine to determine whether to keep the
* argument list.
*/
static int hadhist = 0;
/*
* Avoid alias expansion recursion via \!#
*/
int hleft;
struct Strbuf histline; /* = Strbuf_INIT; last line input */
int histvalid = 0; /* is histline valid */
static Char getCtmp;
#define getC(f) (((getCtmp = peekc) != '\0') ? (peekc = 0, (eChar)getCtmp) : getC1(f))
#define ungetC(c) peekc = (Char) c
#define ungetD(c) peekd = (Char) c
/* Use Htime to store timestamps picked up from history file for enthist()
* if reading saved history (sg)
*/
time_t Htime = (time_t)0;
static time_t a2time_t (Char *);
/*
* special parsing rules apply for source -h
*/
extern int enterhist;
extern int postcmd_active;
int
lex(struct wordent *hp)
{
struct wordent *wdp;
eChar c;
int parsehtime = enterhist;
int toolong = 0;
histvalid = 0;
histline.len = 0;
if (!postcmd_active)
btell(&lineloc);
hp->next = hp->prev = hp;
hp->word = STRNULL;
hadhist = 0;
do
c = readc(0);
while (c == ' ' || c == '\t');
if (c == (eChar)HISTSUB && intty)
/* ^lef^rit from tty is short !:s^lef^rit */
getexcl(c);
else
unreadc(c);
cleanup_push(hp, lex_cleanup);
wdp = hp;
/*
* The following loop is written so that the links needed by freelex will
* be ready and rarin to go even if it is interrupted.
*/
do {
struct wordent *new;
new = xmalloc(sizeof(*new));
new->word = NULL;
new->prev = wdp;
new->next = hp;
wdp->next = new;
hp->prev = new;
wdp = new;
wdp->word = word(parsehtime);
parsehtime = 0;
if (enterhist && toolong++ > 10 * 1024)
stderror(ERR_LTOOLONG);
} while (wdp->word[0] != '\n');
cleanup_ignore(hp);
cleanup_until(hp);
Strbuf_terminate(&histline);
if (histline.len != 0 && histline.s[histline.len - 1] == '\n')
histline.s[histline.len - 1] = '\0';
histvalid = 1;
return (hadhist);
}
static time_t
a2time_t(Char *wordx)
{
/* Attempt to distinguish timestamps from other possible entries.
* Format: "+NNNNNNNNNN" (10 digits, left padded with ascii '0') */
time_t ret;
Char *s;
int ct;
if (!wordx || *(s = wordx) != '+')
return (time_t)0;
for (++s, ret = 0, ct = 0; *s; ++s, ++ct) {
if (!isdigit((unsigned char)*s))
return (time_t)0;
ret = ret * 10 + (time_t)((unsigned char)*s - '0');
}
if (ct != 10)
return (time_t)0;
return ret;
}
void
prlex(struct wordent *sp0)
{
struct wordent *sp = sp0->next;
for (;;) {
xprintf("%S", sp->word);
sp = sp->next;
if (sp == sp0)
break;
if (sp->word[0] != '\n')
xputchar(' ');
}
}
void
copylex(struct wordent *hp, struct wordent *fp)
{
struct wordent *wdp;
wdp = hp;
fp = fp->next;
do {
struct wordent *new;
new = xmalloc(sizeof(*new));
new->word = NULL;
new->prev = wdp;
new->next = hp;
wdp->next = new;
hp->prev = new;
wdp = new;
wdp->word = Strsave(fp->word);
fp = fp->next;
} while (wdp->word[0] != '\n');
}
void
initlex(struct wordent *vp)
{
vp->word = STRNULL;
vp->prev = vp;
vp->next = vp;
}
void
freelex(struct wordent *vp)
{
struct wordent *fp;
while (vp->next != vp) {
fp = vp->next;
vp->next = fp->next;
xfree(fp->word);
xfree(fp);
}
vp->prev = vp;
}
void
lex_cleanup(void *xvp)
{
struct wordent *vp;
vp = xvp;
freelex(vp);
}
static Char *
word(int parsehtime)
{
eChar c, c1;
struct Strbuf wbuf = Strbuf_INIT;
Char hbuf[12];
int h;
int dolflg;
int toolong = 0;
cleanup_push(&wbuf, Strbuf_cleanup);
loop:
if (enterhist && toolong++ > 256 * 1024)
seterror(ERR_WTOOLONG);
while ((c = getC(DOALL)) == ' ' || c == '\t')
continue;
if (cmap(c, _META | _ESC))
switch (c) {
case '&':
case '|':
case '<':
case '>':
Strbuf_append1(&wbuf, c);
c1 = getC(DOALL);
if (c1 == c)
Strbuf_append1(&wbuf, c1);
else
ungetC(c1);
goto ret;
case '#':
if (intty || (enterhist && !parsehtime))
break;
c = 0;
h = 0;
do {
c1 = c;
c = getC(0);
if (h < 11 && parsehtime)
hbuf[h++] = c;
} while (c != '\n');
if (parsehtime) {
hbuf[11] = '\0';
Htime = a2time_t(hbuf);
}
if (c1 == '\\')
goto loop;
/*FALLTHROUGH*/
case ';':
case '(':
case ')':
case '\n':
Strbuf_append1(&wbuf, c);
goto ret;
case '\\':
c = getC(0);
if (c == '\n') {
if (onelflg == 1)
onelflg = 2;
goto loop;
}
if (c != (eChar)HIST)
Strbuf_append1(&wbuf, '\\');
c |= QUOTE;
default:
break;
}
c1 = 0;
dolflg = DOALL;
for (;;) {
if (enterhist && toolong++ > 256 * 1024)
seterror(ERR_WTOOLONG);
if (c1) {
if (c == c1) {
c1 = 0;
dolflg = DOALL;
}
else if (c == '\\') {
c = getC(0);
/*
* PWP: this is dumb, but how all of the other shells work. If \ quotes
* a character OUTSIDE of a set of ''s, why shouldn't it quote EVERY
* following character INSIDE a set of ''s.
*
* Actually, all I really want to be able to say is 'foo\'bar' --> foo'bar
*/
if (c == (eChar)HIST)
c |= QUOTE;
else {
if (bslash_quote &&
((c == '\'') || (c == '"') ||
(c == '\\') || (c == '$'))) {
c |= QUOTE;
}
else {
if (c == '\n')
/*
* if (c1 == '`') c = ' '; else
*/
c |= QUOTE;
ungetC(c);
c = '\\' | QUOTE;
}
}
}
else if (c == '\n') {
seterror(ERR_UNMATCHED, c1);
ungetC(c);
break;
}
}
else if (cmap(c, _META | _QF | _QB | _ESC)) {
if (c == '\\') {
c = getC(0);
if (c == '\n') {
if (onelflg == 1)
onelflg = 2;
break;
}
if (c != (eChar)HIST)
Strbuf_append1(&wbuf, '\\');
c |= QUOTE;
}
else if (cmap(c, _QF | _QB)) { /* '"` */
c1 = c;
dolflg = c == '"' ? DOALL : DOEXCL;
}
else if (c != '#' || (!intty && !enterhist)) {
ungetC(c);
break;
}
}
Strbuf_append1(&wbuf, c);
c = getC(dolflg);
}
ret:
cleanup_ignore(&wbuf);
cleanup_until(&wbuf);
return Strbuf_finish(&wbuf);
}
static eChar
getC1(int flag)
{
eChar c;
for (;;) {
if ((c = peekc) != 0) {
peekc = 0;
return (c);
}
if (lap < labuf.len) {
c = labuf.s[lap++];
if (cmap(c, _META | _QF | _QB))
c |= QUOTE;
return (c);
}
if ((c = peekd) != 0) {
peekd = 0;
return (c);
}
if (exclp) {
if ((c = *exclp++) != 0)
return (c);
if (exclnxt && --exclc >= 0) {
exclnxt = exclnxt->next;
setexclp(exclnxt->word);
return (' ');
}
exclp = 0;
exclnxt = 0;
/* this will throw away the dummy history entries */
savehist(NULL, 0);
}
if (exclnxt) {
exclnxt = exclnxt->next;
if (--exclc < 0)
exclnxt = 0;
else
setexclp(exclnxt->word);
continue;
}
c = readc(1);
/* Catch EOF in the middle of a line. (An EOF at the beginning of
* a line would have been processed by the readc(0) in lex().) */
if (c == CHAR_ERR)
c = '\n';
if (c == '$' && (flag & DODOL)) {
getdol();
continue;
}
if (c == (eChar)HIST && (flag & DOEXCL)) {
getexcl(0);
continue;
}
break;
}
return (c);
}
static void
getdol(void)
{
struct Strbuf name = Strbuf_INIT;
eChar c;
eChar sc;
int special = 0;
c = sc = getC(DOEXCL);
if (any("\t \n", c)) {
ungetD(c);
ungetC('$' | QUOTE);
return;
}
cleanup_push(&name, Strbuf_cleanup);
Strbuf_append1(&name, '$');
if (c == '{')
Strbuf_append1(&name, c), c = getC(DOEXCL);
if (c == '#' || c == '?' || c == '%')
special++, Strbuf_append1(&name, c), c = getC(DOEXCL);
Strbuf_append1(&name, c);
switch (c) {
case '<':
case '$':
case '!':
if (special)
seterror(ERR_SPDOLLT);
goto end;
case '\n':
ungetD(c);
name.len--;
if (!special)
seterror(ERR_NEWLINE);
goto end;
case '*':
if (special)
seterror(ERR_SPSTAR);
goto end;
default:
if (Isdigit(c)) {
#ifdef notdef
/* let $?0 pass for now */
if (special) {
seterror(ERR_DIGIT);
goto end;
}
#endif
while ((c = getC(DOEXCL)) != 0) {
if (!Isdigit(c))
break;
Strbuf_append1(&name, c);
}
}
else if (letter(c)) {
while ((c = getC(DOEXCL)) != 0) {
/* Bugfix for ${v123x} from Chris Torek, DAS DEC-90. */
if (!letter(c) && !Isdigit(c))
break;
Strbuf_append1(&name, c);
}
}
else {
if (!special)
seterror(ERR_VARILL);
else {
ungetD(c);
name.len--;
}
goto end;
}
break;
}
if (c == '[') {
Strbuf_append1(&name, c);
do {
/*
* Michael Greim: Allow $ expansion to take place in selector
* expressions. (limits the number of characters returned)
*/
c = getC(DOEXCL | DODOL);
if (c == '\n') {
ungetD(c);
name.len--;
seterror(ERR_NLINDEX);
goto end;
}
Strbuf_append1(&name, c);
} while (c != ']');
c = getC(DOEXCL);
}
if (c == ':') {
/*
* if the :g modifier is followed by a newline, then error right away!
* -strike
*/
int gmodflag = 0, amodflag = 0;
do {
Strbuf_append1(&name, c), c = getC(DOEXCL);
if (c == 'g' || c == 'a') {
if (c == 'g')
gmodflag++;
else
amodflag++;
Strbuf_append1(&name, c); c = getC(DOEXCL);
}
if ((c == 'g' && !gmodflag) || (c == 'a' && !amodflag)) {
if (c == 'g')
gmodflag++;
else
amodflag++;
Strbuf_append1(&name, c); c = getC(DOEXCL);
}
Strbuf_append1(&name, c);
/* scan s// [eichin:19910926.0512EST] */
if (c == 's') {
int delimcnt = 2;
eChar delim = getC(0);
Strbuf_append1(&name, delim);
if (!delim || letter(delim)
|| Isdigit(delim) || any(" \t\n", delim)) {
seterror(ERR_BADSUBST);
break;
}
while ((c = getC(0)) != CHAR_ERR) {
Strbuf_append1(&name, c);
if(c == delim) delimcnt--;
if(!delimcnt) break;
}
if(delimcnt) {
seterror(ERR_BADSUBST);
break;
}
c = 's';
}
if (!any("htrqxesul", c)) {
if ((amodflag || gmodflag) && c == '\n')
stderror(ERR_VARSYN); /* strike */
seterror(ERR_BADMOD, c);
goto end;
}
}
while ((c = getC(DOEXCL)) == ':');
ungetD(c);
}
else
ungetD(c);
if (sc == '{') {
c = getC(DOEXCL);
if (c != '}') {
ungetD(c);
seterror(ERR_MISSING, '}');
goto end;
}
Strbuf_append1(&name, c);
}
end:
cleanup_ignore(&name);
cleanup_until(&name);
addla(Strbuf_finish(&name));
}
/* xfree()'s its argument */
void
addla(Char *cp)
{
static struct Strbuf buf; /* = Strbuf_INIT; */
buf.len = 0;
Strbuf_appendn(&buf, labuf.s + lap, labuf.len - lap);
labuf.len = 0;
Strbuf_append(&labuf, cp);
Strbuf_terminate(&labuf);
Strbuf_appendn(&labuf, buf.s, buf.len);
xfree(cp);
lap = 0;
}
/* left-hand side of last :s or search string of last ?event? */
static struct Strbuf lhsb; /* = Strbuf_INIT; */
static struct Strbuf slhs; /* = Strbuf_INIT; left-hand side of last :s */
static struct Strbuf rhsb; /* = Strbuf_INIT; right-hand side of last :s */
static int quesarg;
static void
getexcl(Char sc)
{
struct wordent *hp, *ip;
int left, right, dol;
eChar c;
if (sc == 0) {
c = getC(0);
if (c == '{')
sc = (Char) c;
else
ungetC(c);
}
quesarg = -1;
lastev = eventno;
hp = gethent(sc);
if (hp == 0)
return;
hadhist = 1;
dol = 0;
if (hp == alhistp)
for (ip = hp->next->next; ip != alhistt; ip = ip->next)
dol++;
else
for (ip = hp->next->next; ip != hp->prev; ip = ip->next)
dol++;
left = 0, right = dol;
if (sc == HISTSUB && HISTSUB != '\0') {
ungetC('s'), unreadc(HISTSUB), c = ':';
goto subst;
}
c = getC(0);
if (!any(":^$*-%", c))
goto subst;
left = right = -1;
if (c == ':') {
c = getC(0);
unreadc(c);
if (letter(c) || c == '&') {
c = ':';
left = 0, right = dol;
goto subst;
}
}
else
ungetC(c);
if (!getsel(&left, &right, dol))
return;
c = getC(0);
if (c == '*')
ungetC(c), c = '-';
if (c == '-') {
if (!getsel(&left, &right, dol))
return;
c = getC(0);
}
subst:
exclc = right - left + 1;
while (--left >= 0)
hp = hp->next;
if ((sc == HISTSUB && HISTSUB != '\0') || c == ':') {
do {
hp = getsub(hp);
c = getC(0);
} while (c == ':');
}
unreadc(c);
if (sc == '{') {
c = getC(0);
if (c != '}')
seterror(ERR_BADBANG);
}
exclnxt = hp;
}
static struct wordent *
getsub(struct wordent *en)
{
eChar delim;
eChar c;
eChar sc;
int global;
do {
exclnxt = 0;
global = 0;
sc = c = getC(0);
while (c == 'g' || c == 'a') {
global |= (c == 'g') ? FLAG_G : FLAG_A;
sc = c = getC(0);
}
switch (c) {
case 'p':
justpr++;
return (en);
case 'x':
case 'q':
global |= FLAG_G;
/*FALLTHROUGH*/
case 'h':
case 'r':
case 't':
case 'e':
case 'u':
case 'l':
break;
case '&':
if (slhs.len == 0) {
seterror(ERR_NOSUBST);
return (en);
}
lhsb.len = 0;
Strbuf_append(&lhsb, slhs.s);
Strbuf_terminate(&lhsb);
break;
#ifdef notdef
case '~':
if (lhsb.len == 0)
goto badlhs;
break;
#endif
case 's':
delim = getC(0);
if (letter(delim) || Isdigit(delim) || any(" \t\n", delim)) {
unreadc(delim);
lhsb.len = 0;
seterror(ERR_BADSUBST);
return (en);
}
Strbuf_terminate(&lhsb);
lhsb.len = 0;
for (;;) {
c = getC(0);
if (c == '\n') {
unreadc(c);
break;
}
if (c == delim)
break;
if (c == '\\') {
c = getC(0);
if (c != delim && c != '\\')
Strbuf_append1(&lhsb, '\\');
}
Strbuf_append1(&lhsb, c);
}
if (lhsb.len != 0)
Strbuf_terminate(&lhsb);
else if (lhsb.s[0] == 0) {
seterror(ERR_LHS);
return (en);
} else
lhsb.len = Strlen(lhsb.s); /* lhsb.s wasn't changed */
rhsb.len = 0;
for (;;) {
c = getC(0);
if (c == '\n') {
unreadc(c);
break;
}
if (c == delim)
break;
if (c == '\\') {
c = getC(0);
if (c != delim /* && c != '~' */ )
Strbuf_append1(&rhsb, '\\');
}
Strbuf_append1(&rhsb, c);
}
Strbuf_terminate(&rhsb);
break;
default:
if (c == '\n')
unreadc(c);
seterror(ERR_BADBANGMOD, (int)c);
return (en);
}
slhs.len = 0;
if (lhsb.s != NULL && lhsb.len != 0)
Strbuf_append(&slhs, lhsb.s);
Strbuf_terminate(&slhs);
if (exclc)
en = dosub(sc, en, global);
}
while ((c = getC(0)) == ':');
unreadc(c);
return (en);
}
/*
*
* From Beto Appleton (beto@aixwiz.austin.ibm.com)
*
* when using history substitution, and the variable
* 'history' is set to a value higher than 1000,
* the shell might either freeze (hang) or core-dump.
* We raise the limit to 50000000
*/
#define HIST_PURGE -50000000
static struct wordent *
dosub(Char sc, struct wordent *en, int global)
{
struct wordent lexi;
int didsub = 0, didone = 0;
struct wordent *hp = &lexi;
struct wordent *wdp;
int i = exclc;
struct Hist *hst;
wdp = hp;
while (--i >= 0) {
struct wordent *new = xcalloc(1, sizeof *wdp);
new->word = 0;
new->prev = wdp;
new->next = hp;
wdp->next = new;
wdp = new;
en = en->next;
if (en->word) {
Char *tword, *otword;
if ((global & FLAG_G) || didsub == 0) {
size_t pos;
pos = 0;
tword = subword(en->word, sc, &didone, &pos);
if (didone)
didsub = 1;
if (global & FLAG_A) {
while (didone && tword != STRNULL) {
otword = tword;
tword = subword(otword, sc, &didone, &pos);
if (Strcmp(tword, otword) == 0) {
xfree(otword);
break;
}
else
xfree(otword);
}
}
}
else
tword = Strsave(en->word);
wdp->word = tword;
}
}
if (didsub == 0)
seterror(ERR_MODFAIL);
hp->prev = wdp;
/*
* ANSI mode HP/UX compiler chokes on
* return &enthist(HIST_PURGE, &lexi, 0)->Hlex;
*/
hst = enthist(HIST_PURGE, &lexi, 0, 0, -1);
return &(hst->Hlex);
}
/* Return a newly allocated result of one modification of CP using the
operation TYPE. Set ADID to 1 if a modification was performed.
If TYPE == 's', perform substitutions only from *START_POS on and set
*START_POS to the position of next substitution attempt. */
static Char *
subword(Char *cp, Char type, int *adid, size_t *start_pos)
{
Char *wp;
const Char *mp, *np;
switch (type) {
case 'r':
case 'e':
case 'h':
case 't':
case 'q':
case 'x':
case 'u':
case 'l':
wp = domod(cp, type);
if (wp == 0) {
*adid = 0;
return (Strsave(cp));
}
*adid = 1;
return (wp);
default:
for (mp = cp + *start_pos; *mp; mp++) {
if (matchs(mp, lhsb.s)) {
struct Strbuf wbuf = Strbuf_INIT;
Strbuf_appendn(&wbuf, cp, mp - cp);
for (np = rhsb.s; *np; np++)
switch (*np) {
case '\\':
if (np[1] == '&')
np++;
/* fall into ... */
default:
Strbuf_append1(&wbuf, *np);
continue;
case '&':
Strbuf_append(&wbuf, lhsb.s);
continue;
}
*start_pos = wbuf.len;
Strbuf_append(&wbuf, mp + lhsb.len);
*adid = 1;
return Strbuf_finish(&wbuf);
}
}
*adid = 0;
return (Strsave(cp));
}
}
Char *
domod(Char *cp, Char type)
{
Char *wp, *xp;
int c;
switch (type) {
case 'q':
case 'x':
if (*cp == '\0')
return Strsave(STRQNULL);
wp = Strsave(cp);
for (xp = wp; (c = *xp) != 0; xp++)
if ((c != ' ' && c != '\t') || type == 'q')
*xp |= QUOTE;
return (wp);
case 'l':
wp = NLSChangeCase(cp, 1);
return wp ? wp : Strsave(cp);
case 'u':
wp = NLSChangeCase(cp, 0);
return wp ? wp : Strsave(cp);
case 'h':
case 't':
if (!any(short2str(cp), '/'))
return (type == 't' ? Strsave(cp) : 0);
wp = Strrchr(cp, '/');
if (type == 'h')
xp = Strnsave(cp, wp - cp);
else
xp = Strsave(wp + 1);
return (xp);
case 'e':
case 'r':
wp = Strend(cp);
for (wp--; wp >= cp && *wp != '/'; wp--)
if (*wp == '.') {
if (type == 'e')
xp = Strsave(wp + 1);
else
xp = Strnsave(cp, wp - cp);
return (xp);
}
return (Strsave(type == 'e' ? STRNULL : cp));
default:
break;
}
return (0);
}
static int
matchs(const Char *str, const Char *pat)
{
while (*str && *pat && *str == *pat)
str++, pat++;
return (*pat == 0);
}
static int
getsel(int *al, int *ar, int dol)
{
eChar c = getC(0);
int i;
int first = *al < 0;
switch (c) {
case '%':
if (quesarg == -1) {
seterror(ERR_BADBANGARG);
return (0);
}
if (*al < 0)
*al = quesarg;
*ar = quesarg;
break;
case '-':
if (*al < 0) {
*al = 0;
*ar = dol - 1;
unreadc(c);
}
return (1);
case '^':
if (*al < 0)
*al = 1;
*ar = 1;
break;
case '$':
if (*al < 0)
*al = dol;
*ar = dol;
break;
case '*':
if (*al < 0)
*al = 1;
*ar = dol;
if (*ar < *al) {
*ar = 0;
*al = 1;
return (1);
}
break;
default:
if (Isdigit(c)) {
i = 0;
while (Isdigit(c)) {
i = i * 10 + c - '0';
c = getC(0);
}
if (i < 0)
i = dol + 1;
if (*al < 0)
*al = i;
*ar = i;
}
else if (*al < 0)
*al = 0, *ar = dol;
else
*ar = dol - 1;
unreadc(c);
break;
}
if (first) {
c = getC(0);
unreadc(c);
if (any("-$*", c))
return (1);
}
if (*al > *ar || *ar > dol) {
seterror(ERR_BADBANGARG);
return (0);
}
return (1);
}
static struct wordent *
gethent(Char sc)
{
struct Hist *hp;
Char *np;
eChar c;
int event;
int back = 0;
c = (sc == HISTSUB && HISTSUB != '\0') ? (eChar)HIST : getC(0);
if (c == (eChar)HIST) {
if (alhistp)
return (alhistp);
event = eventno;
}
else
switch (c) {
case ':':
case '^':
case '$':
case '*':
case '%':
ungetC(c);
if (lastev == eventno && alhistp)
return (alhistp);
event = lastev;
break;
case '#': /* !# is command being typed in (mrh) */
if (--hleft == 0) {
seterror(ERR_HISTLOOP);
return (0);
}
else
return (&paraml);
/* NOTREACHED */
case '-':
back = 1;
c = getC(0);
/* FALLSTHROUGH */
default:
if (any("(=~", c)) {
unreadc(c);
ungetC(HIST);
return (0);
}
Strbuf_terminate(&lhsb);
lhsb.len = 0;
event = 0;
while (!cmap(c, _ESC | _META | _QF | _QB) && !any("^*-%${}:#", c)) {
if (event != -1 && Isdigit(c))
event = event * 10 + c - '0';
else
event = -1;
Strbuf_append1(&lhsb, c);
c = getC(0);
}
unreadc(c);
if (lhsb.len == 0) {
lhsb.len = Strlen(lhsb.s); /* lhsb.s wasn't changed */
ungetC(HIST);
return (0);
}
Strbuf_terminate(&lhsb);
if (event != -1) {
/*
* History had only digits
*/
if (back)
event = eventno + (alhistp == 0) - event;
break;
}
if (back) {
Strbuf_append1(&lhsb, '\0'); /* Allocate space */
Strbuf_terminate(&lhsb);
memmove(lhsb.s + 1, lhsb.s, (lhsb.len - 1) * sizeof (*lhsb.s));
lhsb.s[0] = '-';
}
hp = findev(lhsb.s, 0);
if (hp)
lastev = hp->Hnum;
return (&hp->Hlex);
case '?':
Strbuf_terminate(&lhsb);
lhsb.len = 0;
for (;;) {
c = getC(0);
if (c == '\n') {
unreadc(c);
break;
}
if (c == '?')
break;
Strbuf_append1(&lhsb, c);
}
if (lhsb.len == 0) {
lhsb.len = Strlen(lhsb.s); /* lhsb.s wasn't changed */
if (lhsb.len == 0) {
seterror(ERR_NOSEARCH);
return (0);
}
}
else
Strbuf_terminate(&lhsb);
hp = findev(lhsb.s, 1);
if (hp)
lastev = hp->Hnum;
return (&hp->Hlex);
}
for (hp = Histlist.Hnext; hp; hp = hp->Hnext)
if (hp->Hnum == event) {
hp->Href = eventno;
lastev = hp->Hnum;
return (&hp->Hlex);
}
np = putn((tcsh_number_t)event);
seterror(ERR_NOEVENT, short2str(np));
xfree(np);
return (0);
}
static struct Hist *
findev(Char *cp, int anyarg)
{
struct Hist *hp;
for (hp = Histlist.Hnext; hp; hp = hp->Hnext) {
Char *dp;
Char *p, *q;
struct wordent *lp = hp->Hlex.next;
int argno = 0;
/*
* The entries added by alias substitution don't have a newline but do
* have a negative event number. Savehist() trims off these entries,
* but it happens before alias expansion, too early to delete those
* from the previous command.
*/
if (hp->Hnum < 0)
continue;
if (lp->word[0] == '\n')
continue;
if (!anyarg) {
p = cp;
q = lp->word;
do
if (!*p)
return (hp);
while (*p++ == *q++);
continue;
}
do {
for (dp = lp->word; *dp; dp++) {
p = cp;
q = dp;
do
if (!*p) {
quesarg = argno;
return (hp);
}
while (*p++ == *q++);
}
lp = lp->next;
argno++;
} while (lp->word[0] != '\n');
}
seterror(ERR_NOEVENT, short2str(cp));
return (0);
}
static void
setexclp(Char *cp)
{
if (cp && cp[0] == '\n')
return;
exclp = cp;
}
void
unreadc(Char c)
{
peekread = (Char) c;
}
eChar
readc(int wanteof)
{
eChar c;
static int sincereal; /* Number of real EOFs we've seen */
#ifdef DEBUG_INP
xprintf("readc\n");
#endif
if ((c = peekread) != 0) {
peekread = 0;
return (c);
}
top:
aret = TCSH_F_SEEK;
if (alvecp) {
arun = 1;
#ifdef DEBUG_INP
xprintf("alvecp %c\n", *alvecp & 0xff);
#endif
aret = TCSH_A_SEEK;
if ((c = *alvecp++) != 0)
return (c);
if (alvec && *alvec) {
alvecp = *alvec++;
return (' ');
}
else {
alvecp = NULL;
aret = TCSH_F_SEEK;
return('\n');
}
}
if (alvec) {
arun = 1;
if ((alvecp = *alvec) != 0) {
alvec++;
goto top;
}
/* Infinite source! */
return ('\n');
}
arun = 0;
if (evalp) {
aret = TCSH_E_SEEK;
if ((c = *evalp++) != 0)
return (c);
if (evalvec && *evalvec) {
evalp = *evalvec++;
return (' ');
}
aret = TCSH_F_SEEK;
evalp = 0;
}
if (evalvec) {
if (evalvec == INVPPTR) {
doneinp = 1;
reset();
}
if ((evalp = *evalvec) != 0) {
evalvec++;
goto top;
}
evalvec = INVPPTR;
return ('\n');
}
do {
if (arginp == INVPTR || onelflg == 1) {
if (wanteof)
return CHAR_ERR;
exitstat();
}
if (arginp) {
if ((c = *arginp++) == 0) {
arginp = INVPTR;
return ('\n');
}
return (c);
}
#ifdef BSDJOBS
reread:
#endif /* BSDJOBS */
c = bgetc();
if (c == CHAR_ERR) {
#ifndef WINNT_NATIVE
# ifndef POSIX
# ifdef TERMIO
struct termio tty;
# else /* SGTTYB */
struct sgttyb tty;
# endif /* TERMIO */
# else /* POSIX */
struct termios tty;
# endif /* POSIX */
#endif /* !WINNT_NATIVE */
if (wanteof)
return CHAR_ERR;
/* was isatty but raw with ignoreeof yields problems */
#ifndef WINNT_NATIVE
# ifndef POSIX
# ifdef TERMIO
if (ioctl(SHIN, TCGETA, (ioctl_t) & tty) == 0 &&
(tty.c_lflag & ICANON))
# else /* GSTTYB */
if (ioctl(SHIN, TIOCGETP, (ioctl_t) & tty) == 0 &&
(tty.sg_flags & RAW) == 0)
# endif /* TERMIO */
# else /* POSIX */
if (tcgetattr(SHIN, &tty) == 0 &&
(tty.c_lflag & ICANON))
# endif /* POSIX */
#else /* WINNT_NATIVE */
if (isatty(SHIN))
#endif /* !WINNT_NATIVE */
{
#ifdef BSDJOBS
pid_t ctpgrp;
#endif /* BSDJOBS */
if (numeof != 0 && ++sincereal >= numeof) /* Too many EOFs? Bye! */
goto oops;
#ifdef BSDJOBS
if (tpgrp != -1 &&
(ctpgrp = tcgetpgrp(FSHTTY)) != -1 &&
tpgrp != ctpgrp) {
(void) tcsetpgrp(FSHTTY, tpgrp);
# ifdef _SEQUENT_
if (ctpgrp)
# endif /* _SEQUENT */
(void) killpg(ctpgrp, SIGHUP);
# ifdef notdef
/*
* With the walking process group fix, this message
* is now obsolete. As the foreground process group
* changes, the shell needs to adjust. Well too bad.
*/
xprintf(CGETS(16, 1, "Reset tty pgrp from %d to %d\n"),
(int)ctpgrp, (int)tpgrp);
# endif /* notdef */
goto reread;
}
#endif /* BSDJOBS */
/* What follows is complicated EOF handling -- sterling@netcom.com */
/* First, we check to see if we have ignoreeof set */
if (adrof(STRignoreeof)) {
/* If so, we check for any stopped jobs only on the first EOF */
if ((sincereal == 1) && (chkstop == 0)) {
panystop(1);
}
} else {
/* If we don't have ignoreeof set, always check for stopped jobs */
if (chkstop == 0) {
panystop(1);
}
}
/* At this point, if there were stopped jobs, we would have already
* called reset(). If we got this far, assume we can print an
* exit/logout message if we ignoreeof, or just exit.
*/
if (adrof(STRignoreeof)) {
/* If so, tell the user to use exit or logout */
if (loginsh) {
xprintf("%s", CGETS(16, 2,
"\nUse \"logout\" to logout.\n"));
} else {
xprintf(CGETS(16, 3,
"\nUse \"exit\" to leave %s.\n"),
progname);
}
reset();
} else {
/* If we don't have ignoreeof set, just fall through */
; /* EMPTY */
}
}
oops:
doneinp = 1;
reset();
}
sincereal = 0;
if (c == '\n' && onelflg)
onelflg--;
} while (c == 0);
Strbuf_append1(&histline, c);
return (c);
}
static void
balloc(int buf)
{
Char **nfbuf;
while (buf >= fblocks) {
nfbuf = xcalloc(fblocks + 2, sizeof(Char **));
if (fbuf) {
(void) blkcpy(nfbuf, fbuf);
xfree(fbuf);
}
fbuf = nfbuf;
fbuf[fblocks] = xcalloc(BUFSIZE, sizeof(Char));
fblocks++;
}
}
ssize_t
wide_read(int fildes, Char *buf, size_t nchars, int use_fclens)
{
char cbuf[BUFSIZE + 1];
ssize_t res, r = 0;
size_t partial;
int err;
if (nchars == 0)
return 0;
assert (nchars <= sizeof(cbuf) / sizeof(*cbuf));
USE(use_fclens);
res = 0;
partial = 0;
do {
size_t i;
size_t len = nchars > partial ? nchars - partial : 1;
if (partial + len >= sizeof(cbuf) / sizeof(*cbuf))
break;
r = xread(fildes, cbuf + partial, len);
if (partial == 0 && r <= 0)
break;
partial += r;
i = 0;
while (i < partial && nchars != 0) {
int tlen;
tlen = normal_mbtowc(buf + res, cbuf + i, partial - i);
if (tlen == -1) {
reset_mbtowc();
if ((partial - i) < MB_LEN_MAX && r > 0)
/* Maybe a partial character and there is still a chance
to read more */
break;
buf[res] = (unsigned char)cbuf[i] | INVALID_BYTE;
}
if (tlen <= 0)
tlen = 1;
#ifdef WIDE_STRINGS
if (use_fclens)
fclens[res] = tlen;
#endif
i += tlen;
res++;
nchars--;
}
if (i != partial)
memmove(cbuf, cbuf + i, partial - i);
partial -= i;
} while (partial != 0 && nchars > 0);
/* Throwing away possible partial multibyte characters on error if the
stream is not seekable */
err = errno;
lseek(fildes, -(off_t)partial, L_INCR);
errno = err;
return res != 0 ? res : r;
}
static eChar
bgetc(void)
{
Char ch;
int c, off, buf;
int numleft = 0, roomleft;
if (cantell) {
if (fseekp < fbobp || fseekp > feobp) {
fbobp = feobp = fseekp;
(void) lseek(SHIN, fseekp, L_SET);
}
if (fseekp == feobp) {
#ifdef WIDE_STRINGS
off_t bytes;
size_t i;
bytes = fbobp;
for (i = 0; i < (size_t)(feobp - fbobp); i++)
bytes += fclens[i];
fseekp = feobp = bytes;
#endif
fbobp = feobp;
c = wide_read(SHIN, fbuf[0], BUFSIZE, 1);
#ifdef convex
if (c < 0)
stderror(ERR_SYSTEM, progname, strerror(errno));
#endif /* convex */
if (c <= 0)
return CHAR_ERR;
feobp += c;
}
#if !defined(WINNT_NATIVE) && !defined(__CYGWIN__)
ch = fbuf[0][fseekp - fbobp];
fseekp++;
#else
do {
ch = fbuf[0][fseekp - fbobp];
fseekp++;
} while(ch == '\r');
#endif /* !WINNT_NATIVE && !__CYGWIN__ */
return (ch);
}
while (fseekp >= feobp) {
if ((editing
#if defined(FILEC) && defined(TIOCSTI)
|| filec
#endif /* FILEC && TIOCSTI */
) && intty) { /* then use twenex routine */
fseekp = feobp; /* where else? */
#if defined(FILEC) && defined(TIOCSTI)
if (!editing)
c = numleft = tenex(InputBuf, BUFSIZE);
else
#endif /* FILEC && TIOCSTI */
c = numleft = Inputl(); /* PWP: get a line */
while (numleft > 0) {
off = (int) feobp % BUFSIZE;
buf = (int) feobp / BUFSIZE;
balloc(buf);
roomleft = BUFSIZE - off;
if (roomleft > numleft)
roomleft = numleft;
(void) memcpy(fbuf[buf] + off, InputBuf + c - numleft,
roomleft * sizeof(Char));
numleft -= roomleft;
feobp += roomleft;
}
} else {
off = (int) feobp % BUFSIZE;
buf = (int) feobp / BUFSIZE;
balloc(buf);
roomleft = BUFSIZE - off;
c = wide_read(SHIN, fbuf[buf] + off, roomleft, 0);
if (c > 0)
feobp += c;
}
if (c == 0 || (c < 0 && fixio(SHIN, errno) == -1))
return CHAR_ERR;
}
#ifdef SIG_WINDOW
if (windowchg)
(void) check_window_size(0); /* for window systems */
#endif /* SIG_WINDOW */
#if !defined(WINNT_NATIVE) && !defined(__CYGWIN__)
ch = fbuf[(int) fseekp / BUFSIZE][(int) fseekp % BUFSIZE];
fseekp++;
#else
do {
ch = fbuf[(int) fseekp / BUFSIZE][(int) fseekp % BUFSIZE];
fseekp++;
} while(ch == '\r');
#endif /* !WINNT_NATIVE && !__CYGWIN__ */
return (ch);
}
static void
bfree(void)
{
int sb, i;
if (cantell)
return;
if (whyles)
return;
sb = (int) (fseekp - 1) / BUFSIZE;
if (sb > 0) {
for (i = 0; i < sb; i++)
xfree(fbuf[i]);
(void) blkcpy(fbuf, &fbuf[sb]);
fseekp -= BUFSIZE * sb;
feobp -= BUFSIZE * sb;
fblocks -= sb;
}
}
void
bseek(struct Ain *l)
{
switch (aret = l->type) {
case TCSH_E_SEEK:
evalvec = l->a_seek;
evalp = l->c_seek;
#ifdef DEBUG_SEEK
xprintf(CGETS(16, 4, "seek to eval %x %x\n"), evalvec, evalp);
#endif
return;
case TCSH_A_SEEK:
alvec = l->a_seek;
alvecp = l->c_seek;
#ifdef DEBUG_SEEK
xprintf(CGETS(16, 5, "seek to alias %x %x\n"), alvec, alvecp);
#endif
return;
case TCSH_F_SEEK:
#ifdef DEBUG_SEEK
xprintf(CGETS(16, 6, "seek to file %x\n"), fseekp);
#endif
fseekp = l->f_seek;
#ifdef WIDE_STRINGS
if (cantell) {
if (fseekp >= fbobp && feobp >= fbobp) {
size_t i;
off_t o;
o = fbobp;
for (i = 0; i < (size_t)(feobp - fbobp); i++) {
if (fseekp == o) {
fseekp = fbobp + i;
return;
}
o += fclens[i];
}
if (fseekp == o) {
fseekp = feobp;
return;
}
}
fbobp = feobp = fseekp + 1; /* To force lseek() */
}
#endif
return;
default:
xprintf(CGETS(16, 7, "Bad seek type %d\n"), aret);
abort();
}
}
/* any similarity to bell telephone is purely accidental */
void
btell(struct Ain *l)
{
switch (l->type = aret) {
case TCSH_E_SEEK:
l->a_seek = evalvec;
l->c_seek = evalp;
#ifdef DEBUG_SEEK
xprintf(CGETS(16, 8, "tell eval %x %x\n"), evalvec, evalp);
#endif
return;
case TCSH_A_SEEK:
l->a_seek = alvec;
l->c_seek = alvecp;
#ifdef DEBUG_SEEK
xprintf(CGETS(16, 9, "tell alias %x %x\n"), alvec, alvecp);
#endif
return;
case TCSH_F_SEEK:
#ifdef WIDE_STRINGS
if (cantell && fseekp >= fbobp && fseekp <= feobp) {
size_t i;
l->f_seek = fbobp;
for (i = 0; i < (size_t)(fseekp - fbobp); i++)
l->f_seek += fclens[i];
} else
#endif
/*SUPPRESS 112*/
l->f_seek = fseekp;
l->a_seek = NULL;
#ifdef DEBUG_SEEK
xprintf(CGETS(16, 10, "tell file %x\n"), fseekp);
#endif
return;
default:
xprintf(CGETS(16, 7, "Bad seek type %d\n"), aret);
abort();
}
}
void
btoeof(void)
{
(void) lseek(SHIN, (off_t) 0, L_XTND);
aret = TCSH_F_SEEK;
fseekp = feobp;
alvec = NULL;
alvecp = NULL;
evalvec = NULL;
evalp = NULL;
wfree();
bfree();
}
void
settell(void)
{
off_t x;
cantell = 0;
if (arginp || onelflg || intty)
return;
if ((x = lseek(SHIN, (off_t) 0, L_INCR)) == -1)
return;
fbuf = xcalloc(2, sizeof(Char **));
fblocks = 1;
fbuf[0] = xcalloc(BUFSIZE, sizeof(Char));
fseekp = fbobp = feobp = x;
cantell = 1;
}
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