NetBSD-5.0.2/bin/csh/lex.c
/* $NetBSD: lex.c,v 1.26 2007/07/16 18:26:10 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[] = "@(#)lex.c 8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: lex.c,v 1.26 2007/07/16 18:26:10 christos Exp $");
#endif
#endif /* not lint */
#include <sys/ioctl.h>
#include <sys/types.h>
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "csh.h"
#include "extern.h"
/*
* 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(void);
static int getC1(int);
static void getdol(void);
static void getexcl(int);
static struct Hist *findev(Char *, int);
static void setexclp(Char *);
static int bgetc(void);
static void bfree(void);
static struct wordent *gethent(int);
static int matchs(Char *, Char *);
static int getsel(int *, int *, int);
static struct wordent *getsub(struct wordent *);
static Char *subword(Char *, int, int *);
static struct wordent *dosub(int, 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 */
Char **alvec, *alvecp;
int aret = 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.
*/
static Char labuf[BUFSIZE];
/*
* 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;
static Char getCtmp;
#define getC(f) ((getCtmp = peekc) ? (peekc = 0, getCtmp) : getC1(f))
#define ungetC(c) peekc = c
#define ungetD(c) peekd = c
int
lex(struct wordent *hp)
{
struct wordent *wdp;
int c;
btell(&lineloc);
hp->next = hp->prev = hp;
hp->word = STRNULL;
hadhist = 0;
do
c = readc(0);
while (c == ' ' || c == '\t');
if (c == HISTSUB && intty)
/* ^lef^rit from tty is short !:s^lef^rit */
getexcl(c);
else
unreadc(c);
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 = (struct wordent *)xmalloc((size_t)sizeof(*wdp));
new->word = 0;
new->prev = wdp;
new->next = hp;
wdp->next = new;
wdp = new;
wdp->word = word();
} while (wdp->word[0] != '\n');
hp->prev = wdp;
return (hadhist);
}
void
prlex(FILE *fp, struct wordent *sp0)
{
struct wordent *sp;
sp = sp0->next;
for (;;) {
(void)fprintf(fp, "%s", vis_str(sp->word));
sp = sp->next;
if (sp == sp0)
break;
if (sp->word[0] != '\n')
(void) fputc(' ', fp);
}
}
void
copylex(struct wordent *hp, struct wordent *fp)
{
struct wordent *wdp;
wdp = hp;
fp = fp->next;
do {
struct wordent *new;
new = (struct wordent *)xmalloc((size_t)sizeof(*wdp));
new->prev = wdp;
new->next = hp;
wdp->next = new;
wdp = new;
wdp->word = Strsave(fp->word);
fp = fp->next;
} while (wdp->word[0] != '\n');
hp->prev = wdp;
}
void
freelex(struct wordent *vp)
{
struct wordent *fp;
while (vp->next != vp) {
fp = vp->next;
vp->next = fp->next;
xfree((ptr_t) fp->word);
xfree((ptr_t) fp);
}
vp->prev = vp;
}
static Char *
word(void)
{
Char wbuf[BUFSIZE], *wp;
int i;
Char c, c1;
int dolflg;
wp = wbuf;
i = BUFSIZE - 4;
loop:
while ((c = getC(DOALL)) == ' ' || c == '\t')
continue;
if (cmap(c, _META | _ESC))
switch (c) {
case '&':
case '|':
case '<':
case '>':
*wp++ = c;
c1 = getC(DOALL);
if (c1 == c)
*wp++ = c1;
else
ungetC(c1);
goto ret;
case '#':
if (intty)
break;
c = 0;
do {
c1 = c;
c = getC(0);
} while (c != '\n');
if (c1 == '\\')
goto loop;
/* FALLTHROUGH */
case ';':
case '(':
case ')':
case '\n':
*wp++ = c;
goto ret;
case '\\':
c = getC(0);
if (c == '\n') {
if (onelflg == 1)
onelflg = 2;
goto loop;
}
if (c != HIST)
*wp++ = '\\', --i;
c |= QUOTE;
break;
}
c1 = 0;
dolflg = DOALL;
for (;;) {
if (c1) {
if (c == c1) {
c1 = 0;
dolflg = DOALL;
}
else if (c == '\\') {
c = getC(0);
if (c == HIST)
c |= QUOTE;
else {
if (c == '\n')
/*
* if (c1 == '`') c = ' '; else
*/
c |= QUOTE;
ungetC(c);
c = '\\';
}
}
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 != HIST)
*wp++ = '\\', --i;
c |= QUOTE;
}
else if (cmap(c, _QF | _QB)) { /* '"` */
c1 = c;
dolflg = c == '"' ? DOALL : DOEXCL;
}
else if (c != '#' || !intty) {
ungetC(c);
break;
}
}
if (--i > 0) {
*wp++ = c;
c = getC(dolflg);
}
else {
seterror(ERR_WTOOLONG);
wp = &wbuf[1];
break;
}
}
ret:
*wp = 0;
return (Strsave(wbuf));
}
static int
getC1(int flag)
{
Char c;
for (;;) {
if ((c = peekc) != '\0') {
peekc = 0;
return (c);
}
if (lap) {
if ((c = *lap++) == 0)
lap = 0;
else {
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;
}
if (exclnxt) {
exclnxt = exclnxt->next;
if (--exclc < 0)
exclnxt = 0;
else
setexclp(exclnxt->word);
continue;
}
c = readc(0);
if (c == '$' && (flag & DODOL)) {
getdol();
continue;
}
if (c == HIST && (flag & DOEXCL)) {
getexcl(0);
continue;
}
break;
}
return (c);
}
static void
getdol(void)
{
Char name[4*MAXVARLEN+1], *ep, *np;
int c, sc;
int special, toolong;
special = 0;
np = name, *np++ = '$';
c = sc = getC(DOEXCL);
if (any("\t \n", c)) {
ungetD(c);
ungetC('$' | QUOTE);
return;
}
if (c == '{')
*np++ = c, c = getC(DOEXCL);
if (c == '#' || c == '?')
special++, *np++ = c, c = getC(DOEXCL);
*np++ = c;
switch (c) {
case '<':
case '$':
case '!':
if (special)
seterror(ERR_SPDOLLT);
*np = 0;
addla(name);
return;
case '\n':
ungetD(c);
np--;
seterror(ERR_NEWLINE);
*np = 0;
addla(name);
return;
case '*':
if (special)
seterror(ERR_SPSTAR);
*np = 0;
addla(name);
return;
default:
toolong = 0;
if (Isdigit(c)) {
#ifdef notdef
/* let $?0 pass for now */
if (special) {
seterror(ERR_DIGIT);
*np = 0;
addla(name);
return;
}
#endif
/* we know that np < &name[4] */
ep = &np[MAXVARLEN];
while ((c = getC(DOEXCL)) != '\0'){
if (!Isdigit(c))
break;
if (np < ep)
*np++ = c;
else
toolong = 1;
}
}
else if (letter(c)) {
/* we know that np < &name[4] */
ep = &np[MAXVARLEN];
toolong = 0;
while ((c = getC(DOEXCL)) != '\0') {
/* Bugfix for ${v123x} from Chris Torek, DAS DEC-90. */
if (!letter(c) && !Isdigit(c))
break;
if (np < ep)
*np++ = c;
else
toolong = 1;
}
}
else {
*np = 0;
seterror(ERR_VARILL);
addla(name);
return;
}
if (toolong) {
seterror(ERR_VARTOOLONG);
*np = 0;
addla(name);
return;
}
break;
}
if (c == '[') {
*np++ = c;
/*
* Name up to here is a max of MAXVARLEN + 8.
*/
ep = &np[2 * MAXVARLEN + 8];
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);
np--;
seterror(ERR_NLINDEX);
*np = 0;
addla(name);
return;
}
if (np < ep)
*np++ = c;
} while (c != ']');
*np = '\0';
if (np >= ep) {
seterror(ERR_SELOVFL);
addla(name);
return;
}
c = getC(DOEXCL);
}
/*
* Name up to here is a max of 2 * MAXVARLEN + 8.
*/
if (c == ':') {
/*
* if the :g modifier is followed by a newline, then error right away!
* -strike
*/
int amodflag, gmodflag;
amodflag = 0;
gmodflag = 0;
do {
*np++ = c, c = getC(DOEXCL);
if (c == 'g' || c == 'a') {
if (c == 'g')
gmodflag++;
else
amodflag++;
*np++ = c; c = getC(DOEXCL);
}
if ((c == 'g' && !gmodflag) || (c == 'a' && !amodflag)) {
if (c == 'g')
gmodflag++;
else
amodflag++;
*np++ = c; c = getC(DOEXCL);
}
*np++ = c;
/* scan s// [eichin:19910926.0512EST] */
if (c == 's') {
int delimcnt = 2;
int delim = getC(0);
*np++ = delim;
if (!delim || letter(delim)
|| Isdigit(delim) || any(" \t\n", delim)) {
seterror(ERR_BADSUBST);
break;
}
while ((c = getC(0)) != (-1)) {
*np++ = c;
if(c == delim) delimcnt--;
if(!delimcnt) break;
}
if(delimcnt) {
seterror(ERR_BADSUBST);
break;
}
c = 's';
}
if (!any("htrqxes", c)) {
if ((amodflag || gmodflag) && c == '\n')
stderror(ERR_VARSYN); /* strike */
seterror(ERR_VARMOD, c);
*np = 0;
addla(name);
return;
}
}
while ((c = getC(DOEXCL)) == ':');
ungetD(c);
}
else
ungetD(c);
if (sc == '{') {
c = getC(DOEXCL);
if (c != '}') {
ungetD(c);
seterror(ERR_MISSING, '}');
*np = 0;
addla(name);
return;
}
*np++ = c;
}
*np = 0;
addla(name);
return;
}
void
addla(Char *cp)
{
Char buf[BUFSIZE];
if (Strlen(cp) + (lap ? Strlen(lap) : 0) >=
(sizeof(labuf) - 4) / sizeof(Char)) {
seterror(ERR_EXPOVFL);
return;
}
if (lap)
(void)Strcpy(buf, lap);
(void)Strcpy(labuf, cp);
if (lap)
(void)Strcat(labuf, buf);
lap = labuf;
}
static Char lhsb[32];
static Char slhs[32];
static Char rhsb[64];
static int quesarg;
static void
getexcl(int sc)
{
struct wordent *hp, *ip;
int c, dol, left, right;
if (sc == 0) {
sc = getC(0);
if (sc != '{') {
ungetC(sc);
sc = 0;
}
}
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) {
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 || 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)
{
Char orhsb[sizeof(rhsb) / sizeof(Char)];
Char *cp;
int c, delim, sc;
int global;
do {
exclnxt = 0;
global = 0;
sc = c = getC(0);
if (c == 'g' || c == 'a') {
global |= (c == 'g') ? 1 : 2;
sc = c = getC(0);
}
if (((c =='g') && !(global & 1)) || ((c == 'a') && !(global & 2))) {
global |= (c == 'g') ? 1 : 2;
sc = c = getC(0);
}
switch (c) {
case 'p':
justpr++;
return (en);
case 'x':
case 'q':
global |= 1;
/* FALLTHROUGH */
case 'h':
case 'r':
case 't':
case 'e':
break;
case '&':
if (slhs[0] == 0) {
seterror(ERR_NOSUBST);
return (en);
}
(void) Strcpy(lhsb, slhs);
break;
#ifdef notdef
case '~':
if (lhsb[0] == 0)
goto badlhs;
break;
#endif
case 's':
delim = getC(0);
if (letter(delim) || Isdigit(delim) || any(" \t\n", delim)) {
unreadc(delim);
lhsb[0] = 0;
seterror(ERR_BADSUBST);
return (en);
}
cp = lhsb;
for (;;) {
c = getC(0);
if (c == '\n') {
unreadc(c);
break;
}
if (c == delim)
break;
if (cp > &lhsb[sizeof(lhsb) / sizeof(Char) - 2]) {
lhsb[0] = 0;
seterror(ERR_BADSUBST);
return (en);
}
if (c == '\\') {
c = getC(0);
if (c != delim && c != '\\')
*cp++ = '\\';
}
*cp++ = c;
}
if (cp != lhsb)
*cp++ = 0;
else if (lhsb[0] == 0) {
seterror(ERR_LHS);
return (en);
}
cp = rhsb;
(void)Strcpy(orhsb, cp);
for (;;) {
c = getC(0);
if (c == '\n') {
unreadc(c);
break;
}
if (c == delim)
break;
#ifdef notdef
if (c == '~') {
if (&cp[Strlen(orhsb)] > &rhsb[sizeof(rhsb) /
sizeof(Char) - 2])
goto toorhs;
(void)Strcpy(cp, orhsb);
cp = Strend(cp);
continue;
}
#endif
if (cp > &rhsb[sizeof(rhsb) / sizeof(Char) - 2]) {
seterror(ERR_RHSLONG);
return (en);
}
if (c == '\\') {
c = getC(0);
if (c != delim /* && c != '~' */ )
*cp++ = '\\';
}
*cp++ = c;
}
*cp++ = 0;
break;
default:
if (c == '\n')
unreadc(c);
seterror(ERR_BADBANGMOD, c);
return (en);
}
(void)Strcpy(slhs, lhsb);
if (exclc)
en = dosub(sc, en, global);
}
while ((c = getC(0)) == ':');
unreadc(c);
return (en);
}
static struct wordent *
dosub(int sc, struct wordent *en, int global)
{
struct wordent lexi, *hp, *wdp;
int i;
int didone, didsub;
didone = 0;
didsub = 0;
i = exclc;
hp = &lexi;
wdp = hp;
while (--i >= 0) {
struct wordent *new = (struct wordent *)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 & 1) || didsub == 0) {
tword = subword(en->word, sc, &didone);
if (didone)
didsub = 1;
if (global & 2) {
while (didone && tword != STRNULL) {
otword = tword;
tword = subword(otword, sc, &didone);
if (Strcmp(tword, otword) == 0) {
xfree((ptr_t) otword);
break;
}
else
xfree((ptr_t)otword);
}
}
}
else
tword = Strsave(en->word);
wdp->word = tword;
}
}
if (didsub == 0)
seterror(ERR_MODFAIL);
hp->prev = wdp;
return (&enthist(-1000, &lexi, 0)->Hlex);
}
static Char *
subword(Char *cp, int type, int *adid)
{
Char wbuf[BUFSIZE];
Char *mp, *np, *wp;
int i;
*adid = 0;
switch (type) {
case 'r':
case 'e':
case 'h':
case 't':
case 'q':
case 'x':
wp = domod(cp, type);
if (wp == 0)
return (Strsave(cp));
*adid = 1;
return (wp);
default:
wp = wbuf;
i = BUFSIZE - 4;
for (mp = cp; *mp; mp++)
if (matchs(mp, lhsb)) {
for (np = cp; np < mp;)
*wp++ = *np++, --i;
for (np = rhsb; *np; np++)
switch (*np) {
case '\\':
if (np[1] == '&')
np++;
/* FALLTHROUGH */
default:
if (--i < 0) {
seterror(ERR_SUBOVFL);
return (STRNULL);
}
*wp++ = *np;
continue;
case '&':
i -= Strlen(lhsb);
if (i < 0) {
seterror(ERR_SUBOVFL);
return (STRNULL);
}
*wp = 0;
(void) Strcat(wp, lhsb);
wp = Strend(wp);
continue;
}
mp += Strlen(lhsb);
i -= Strlen(mp);
if (i < 0) {
seterror(ERR_SUBOVFL);
return (STRNULL);
}
*wp = 0;
(void) Strcat(wp, mp);
*adid = 1;
return (Strsave(wbuf));
}
return (Strsave(cp));
}
}
Char *
domod(Char *cp, int type)
{
Char *wp, *xp;
int c;
switch (type) {
case 'x':
case 'q':
wp = Strsave(cp);
for (xp = wp; (c = *xp) != '\0'; xp++)
if ((c != ' ' && c != '\t') || type == 'q')
*xp |= QUOTE;
return (wp);
case 'h':
case 't':
if (!any(short2str(cp), '/'))
return (type == 't' ? Strsave(cp) : 0);
wp = Strend(cp);
while (*--wp != '/')
continue;
if (type == 'h')
xp = Strsave(cp), xp[wp - cp] = 0;
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 = Strsave(cp), xp[wp - cp] = 0;
return (xp);
}
return (Strsave(type == 'e' ? STRNULL : cp));
default:
break;
}
return (0);
}
static int
matchs(Char *str, Char *pat)
{
while (*str && *pat && *str == *pat)
str++, pat++;
return (*pat == 0);
}
static int
getsel(int *al, int *ar, int dol)
{
int c, i;
int first;
c = getC(0);
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("-$*", c))
return (1);
}
if (*al > *ar || *ar > dol) {
seterror(ERR_BADBANGARG);
return (0);
}
return (1);
}
static struct wordent *
gethent(int sc)
{
struct Hist *hp;
Char *np;
char *str;
int c, event;
int back;
back = 0;
c = sc == HISTSUB ? HIST : getC(0);
if (c == HIST) {
if (alhistp)
return (alhistp);
event = eventno;
}
else
switch (c) {
case ':':
case '^':
case '$':
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 (¶ml);
/* NOTREACHED */
case '-':
back = 1;
c = getC(0);
/* FALLTHROUGH */
default:
if (any("(=~", c)) {
unreadc(c);
ungetC(HIST);
return (0);
}
np = lhsb;
event = 0;
while (!cmap(c, _ESC | _META | _QF | _QB) && !any("${}:", c)) {
if (event != -1 && Isdigit(c))
event = event * 10 + c - '0';
else
event = -1;
if (np < &lhsb[sizeof(lhsb) / sizeof(Char) - 2])
*np++ = c;
c = getC(0);
}
unreadc(c);
if (np == lhsb) {
ungetC(HIST);
return (0);
}
*np++ = 0;
if (event != -1) {
/*
* History had only digits
*/
if (back)
event = eventno + (alhistp == 0) - (event ? event : 0);
break;
}
hp = findev(lhsb, 0);
if (hp)
lastev = hp->Hnum;
return (&hp->Hlex);
case '?':
np = lhsb;
for (;;) {
c = getC(0);
if (c == '\n') {
unreadc(c);
break;
}
if (c == '?')
break;
if (np < &lhsb[sizeof(lhsb) / sizeof(Char) - 2])
*np++ = c;
}
if (np == lhsb) {
if (lhsb[0] == 0) {
seterror(ERR_NOSEARCH);
return (0);
}
}
else
*np++ = 0;
hp = findev(lhsb, 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(event);
str = vis_str(np);
xfree((ptr_t) np);
seterror(ERR_NOEVENT, str);
return (0);
}
static struct Hist *
findev(Char *cp, int anyarg)
{
struct Hist *hp;
for (hp = Histlist.Hnext; hp; hp = hp->Hnext) {
Char *dp, *p, *q;
struct wordent *lp;
int argno;
lp = hp->Hlex.next;
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, vis_str(cp));
return (0);
}
static void
setexclp(Char *cp)
{
if (cp && cp[0] == '\n')
return;
exclp = cp;
}
void
unreadc(int c)
{
peekread = c;
}
int
readc(int wanteof)
{
static int sincereal;
int c;
aret = F_SEEK;
if ((c = peekread) != '\0') {
peekread = 0;
return (c);
}
top:
aret = F_SEEK;
if (alvecp) {
aret = A_SEEK;
if ((c = *alvecp++) != '\0')
return (c);
if (alvec && *alvec) {
alvecp = *alvec++;
return (' ');
}
else {
aret = F_SEEK;
alvecp = NULL;
return('\n');
}
}
if (alvec) {
if ((alvecp = *alvec) != '\0') {
alvec++;
goto top;
}
/* Infinite source! */
return ('\n');
}
if (evalp) {
aret = E_SEEK;
if ((c = *evalp++) != '\0')
return (c);
if (evalvec && *evalvec) {
evalp = *evalvec++;
return (' ');
}
aret = F_SEEK;
evalp = 0;
}
if (evalvec) {
if (evalvec == (Char **) 1) {
doneinp = 1;
reset();
}
if ((evalp = *evalvec) != '\0') {
evalvec++;
goto top;
}
evalvec = (Char **) 1;
return ('\n');
}
do {
if (arginp == (Char *) 1 || onelflg == 1) {
if (wanteof)
return (-1);
exitstat();
}
if (arginp) {
if ((c = *arginp++) == 0) {
arginp = (Char *) 1;
return ('\n');
}
return (c);
}
reread:
c = bgetc();
if (c < 0) {
struct termios tty;
if (wanteof)
return (-1);
/* was isatty but raw with ignoreeof yields problems */
if (tcgetattr(SHIN, &tty) == 0 && (tty.c_lflag & ICANON))
{
/* was 'short' for FILEC */
pid_t ctpgrp;
if (++sincereal > 25)
goto oops;
if (tpgrp != -1 &&
(ctpgrp = tcgetpgrp(FSHTTY)) != -1 &&
tpgrp != ctpgrp) {
(void)tcsetpgrp(FSHTTY, tpgrp);
(void)kill(-ctpgrp, SIGHUP);
(void)fprintf(csherr, "Reset tty pgrp from %ld to %ld\n",
(long)ctpgrp, (long)tpgrp);
goto reread;
}
if (adrof(STRignoreeof)) {
if (loginsh)
(void)fprintf(csherr,"\nUse \"logout\" to logout.\n");
else
(void)fprintf(csherr,"\nUse \"exit\" to leave csh.\n");
reset();
}
if (chkstop == 0)
panystop(1);
}
oops:
doneinp = 1;
reset();
}
sincereal = 0;
if (c == '\n' && onelflg)
onelflg--;
} while (c == 0);
return (c);
}
static int
bgetc(void)
{
#ifdef FILEC
char tbuf[BUFSIZE + 1];
Char ttyline[BUFSIZE];
int c, buf, numleft, off, roomleft;
numleft = 0;
#else /* FILEC */
char tbuf[BUFSIZE + 1];
int c, buf, off;
#endif /* !FILEC */
if (cantell) {
if (fseekp < fbobp || fseekp > feobp) {
fbobp = feobp = fseekp;
(void)lseek(SHIN, fseekp, SEEK_SET);
}
if (fseekp == feobp) {
int i;
fbobp = feobp;
do
c = read(SHIN, tbuf, BUFSIZE);
while (c < 0 && errno == EINTR);
if (c <= 0)
return (-1);
for (i = 0; i < c; i++)
fbuf[0][i] = (unsigned char) tbuf[i];
feobp += c;
}
c = fbuf[0][fseekp - fbobp];
fseekp++;
return (c);
}
again:
buf = (int) fseekp / BUFSIZE;
if (buf >= fblocks) {
Char **nfbuf;
nfbuf = (Char **)xcalloc((size_t) (fblocks + 2), sizeof(char **));
if (fbuf) {
(void)blkcpy(nfbuf, fbuf);
xfree((ptr_t) fbuf);
}
fbuf = nfbuf;
fbuf[fblocks] = (Char *)xcalloc(BUFSIZE, sizeof(Char));
fblocks++;
if (!intty)
goto again;
}
if (fseekp >= feobp) {
buf = (int) feobp / BUFSIZE;
off = (int) feobp % BUFSIZE;
roomleft = BUFSIZE - off;
#ifdef FILEC
roomleft = BUFSIZE - off;
for (;;) {
if (filec && intty) {
c = numleft ? numleft : tenex(ttyline, BUFSIZE);
if (c > roomleft) {
/* start with fresh buffer */
feobp = fseekp = fblocks * BUFSIZE;
numleft = c;
goto again;
}
if (c > 0)
(void)memcpy(fbuf[buf] + off, ttyline, c * sizeof(Char));
numleft = 0;
}
else {
#endif
c = read(SHIN, tbuf, roomleft);
if (c > 0) {
int i;
Char *ptr = fbuf[buf] + off;
for (i = 0; i < c; i++)
ptr[i] = (unsigned char) tbuf[i];
}
#ifdef FILEC
}
#endif
if (c >= 0)
break;
if (errno == EWOULDBLOCK) {
int iooff = 0;
(void)ioctl(SHIN, FIONBIO, (ioctl_t) & iooff);
}
else if (errno != EINTR)
break;
}
if (c <= 0)
return (-1);
feobp += c;
#ifndef FILEC
goto again;
#else
if (filec && !intty)
goto again;
#endif
}
c = fbuf[buf][(int)fseekp % BUFSIZE];
fseekp++;
return (c);
}
static void
bfree(void)
{
int i, sb;
if (cantell)
return;
if (whyles)
return;
sb = (int)(fseekp - 1) / BUFSIZE;
if (sb > 0) {
for (i = 0; i < sb; i++)
xfree((ptr_t) 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 A_SEEK:
alvec = l->a_seek;
alvecp = l->c_seek;
return;
case E_SEEK:
evalvec = l->a_seek;
evalp = l->c_seek;
return;
case F_SEEK:
fseekp = l->f_seek;
return;
default:
(void)fprintf(csherr, "Bad seek type %d\n", aret);
abort();
}
}
void
btell(struct Ain *l)
{
switch (l->type = aret) {
case A_SEEK:
l->a_seek = alvec;
l->c_seek = alvecp;
return;
case E_SEEK:
l->a_seek = evalvec;
l->c_seek = evalp;
return;
case F_SEEK:
l->f_seek = fseekp;
l->a_seek = NULL;
return;
default:
(void)fprintf(csherr, "Bad seek type %d\n", aret);
abort();
}
}
void
btoeof(void)
{
(void)lseek(SHIN, (off_t) 0, SEEK_END);
aret = F_SEEK;
fseekp = feobp;
alvec = NULL;
alvecp = NULL;
evalvec = NULL;
evalp = NULL;
wfree();
bfree();
}
void
settell(void)
{
cantell = 0;
if (arginp || onelflg || intty)
return;
if (lseek(SHIN, (off_t) 0, SEEK_CUR) < 0 || errno == ESPIPE)
return;
fbuf = (Char **)xcalloc(2, sizeof(Char **));
fblocks = 1;
fbuf[0] = (Char *)xcalloc(BUFSIZE, sizeof(Char));
fseekp = fbobp = feobp = lseek(SHIN, (off_t) 0, SEEK_CUR);
cantell = 1;
}