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irix-657m-src/eoe/cmd/tcsh/sh.exp.c
calmsacibis995 8fc8fa8089 Source code upload
2022-09-29 17:59:04 +03:00

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/* $Header: /proj/irix6.5.7m/isms/eoe/cmd/tcsh/RCS/sh.exp.c,v 1.2 1993/07/15 17:52:27 pdc Exp $ */
/*
* sh.exp.c: Expression evaluations
*/
/*-
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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"
RCSID("$Id: sh.exp.c,v 1.2 1993/07/15 17:52:27 pdc Exp $")
/*
* C shell
*/
#define IGNORE 1 /* in ignore, it means to ignore value, just parse */
#define NOGLOB 2 /* in ignore, it means not to globone */
#define ADDOP 1
#define MULOP 2
#define EQOP 4
#define RELOP 8
#define RESTOP 16
#define ANYOP 31
#define EQEQ 1
#define GTR 2
#define LSS 4
#define NOTEQ 6
#define EQMATCH 7
#define NOTEQMATCH 8
static int sh_access __P((Char *, int));
static int exp1 __P((Char ***, bool));
static int exp2 __P((Char ***, bool));
static int exp2a __P((Char ***, bool));
static int exp2b __P((Char ***, bool));
static int exp2c __P((Char ***, bool));
static Char *exp3 __P((Char ***, bool));
static Char *exp3a __P((Char ***, bool));
static Char *exp4 __P((Char ***, bool));
static Char *exp5 __P((Char ***, bool));
static Char *exp6 __P((Char ***, bool));
static void evalav __P((Char **));
static int isa __P((Char *, int));
static int egetn __P((Char *));
#ifdef EDEBUG
static void etracc __P((char *, Char *, Char ***));
static void etraci __P((char *, int, Char ***));
#endif
/*
* shell access function according to POSIX and non POSIX
* From Beto Appleton (beto@aixwiz.aix.ibm.com)
*/
static int
sh_access(fname, mode)
Char *fname;
int mode;
{
#ifdef POSIX
struct stat statb;
#endif /* POSIX */
char *name = short2str(fname);
if (*name == '\0')
return 1;
#ifndef POSIX
return access(name, mode);
#else /* POSIX */
/*
* POSIX 1003.2-d11.2
* -r file True if file exists and is readable.
* -w file True if file exists and is writable.
* True shall indicate only that the write flag is on.
* The file shall not be writable on a read-only file
* system even if this test indicates true.
* -x file True if file exists and is executable.
* True shall indicate only that the execute flag is on.
* If file is a directory, true indicates that the file
* can be searched.
*/
if (mode != W_OK && mode != X_OK)
return access(name, mode);
if (stat(name, &statb) == -1)
return 1;
if (access(name, mode) == 0) {
#ifdef S_ISDIR
if (S_ISDIR(statb.st_mode) && mode == X_OK)
return 0;
#endif /* S_ISDIR */
/* root needs permission for someone */
switch (mode) {
case W_OK:
mode = S_IWUSR | S_IWGRP | S_IWOTH;
break;
case X_OK:
mode = S_IXUSR | S_IXGRP | S_IXOTH;
break;
default:
abort();
break;
}
}
else if (euid == statb.st_uid)
mode <<= 6;
else if (egid == statb.st_gid)
mode <<= 3;
# ifdef NGROUPS_MAX
else {
# if defined(__386BSD__) || defined(BSD4_4)
/*
* These two decided that setgroup() should take an array of int's
* and they define _SC_NGROUPS_MAX without having sysconf
*/
# undef _SC_NGROUPS_MAX
# define GID_T int
# else
# define GID_T gid_t
# endif /* __386BSD__ || BSD4_4 */
/* you can be in several groups */
int n;
GID_T *groups;
/*
* Try these things to find a positive maximum groups value:
* 1) sysconf(_SC_NGROUPS_MAX)
* 2) NGROUPS_MAX
* 3) getgroups(0, unused)
* Then allocate and scan the groups array if one of these worked.
*/
# ifdef _SC_NGROUPS_MAX
if ((n = sysconf(_SC_NGROUPS_MAX)) == -1)
# endif /* _SC_NGROUPS_MAX */
n = NGROUPS_MAX;
if (n <= 0)
n = getgroups(0, (GID_T *) NULL);
if (n > 0) {
groups = (GID_T *) xmalloc((size_t) (n * sizeof(GID_T)));
n = getgroups(n, groups);
while (--n >= 0)
if (groups[n] == statb.st_gid) {
mode <<= 3;
break;
}
}
}
# endif /* NGROUPS_MAX */
if (statb.st_mode & mode)
return 0;
else
return 1;
#endif /* !POSIX */
}
int
expr(vp)
register Char ***vp;
{
return (exp0(vp, 0));
}
int
exp0(vp, ignore)
register Char ***vp;
bool ignore;
{
register int p1 = exp1(vp, ignore);
#ifdef EDEBUG
etraci("exp0 p1", p1, vp);
#endif
if (**vp && eq(**vp, STRor2)) {
register int p2;
(*vp)++;
p2 = exp0(vp, (ignore & IGNORE) || p1);
#ifdef EDEBUG
etraci("exp0 p2", p2, vp);
#endif
return (p1 || p2);
}
return (p1);
}
static int
exp1(vp, ignore)
register Char ***vp;
bool ignore;
{
register int p1 = exp2(vp, ignore);
#ifdef EDEBUG
etraci("exp1 p1", p1, vp);
#endif
if (**vp && eq(**vp, STRand2)) {
register int p2;
(*vp)++;
p2 = exp1(vp, (ignore & IGNORE) || !p1);
#ifdef EDEBUG
etraci("exp1 p2", p2, vp);
#endif
return (p1 && p2);
}
return (p1);
}
static int
exp2(vp, ignore)
register Char ***vp;
bool ignore;
{
register int p1 = exp2a(vp, ignore);
#ifdef EDEBUG
etraci("exp3 p1", p1, vp);
#endif
if (**vp && eq(**vp, STRor)) {
register int p2;
(*vp)++;
p2 = exp2(vp, ignore);
#ifdef EDEBUG
etraci("exp3 p2", p2, vp);
#endif
return (p1 | p2);
}
return (p1);
}
static int
exp2a(vp, ignore)
register Char ***vp;
bool ignore;
{
register int p1 = exp2b(vp, ignore);
#ifdef EDEBUG
etraci("exp2a p1", p1, vp);
#endif
if (**vp && eq(**vp, STRcaret)) {
register int p2;
(*vp)++;
p2 = exp2a(vp, ignore);
#ifdef EDEBUG
etraci("exp2a p2", p2, vp);
#endif
return (p1 ^ p2);
}
return (p1);
}
static int
exp2b(vp, ignore)
register Char ***vp;
bool ignore;
{
register int p1 = exp2c(vp, ignore);
#ifdef EDEBUG
etraci("exp2b p1", p1, vp);
#endif
if (**vp && eq(**vp, STRand)) {
register int p2;
(*vp)++;
p2 = exp2b(vp, ignore);
#ifdef EDEBUG
etraci("exp2b p2", p2, vp);
#endif
return (p1 & p2);
}
return (p1);
}
static int
exp2c(vp, ignore)
register Char ***vp;
bool ignore;
{
register Char *p1 = exp3(vp, ignore);
register Char *p2;
register int i;
#ifdef EDEBUG
etracc("exp2c p1", p1, vp);
#endif
if ((i = isa(**vp, EQOP)) != 0) {
(*vp)++;
if (i == EQMATCH || i == NOTEQMATCH)
ignore |= NOGLOB;
p2 = exp3(vp, ignore);
#ifdef EDEBUG
etracc("exp2c p2", p2, vp);
#endif
if (!(ignore & IGNORE))
switch (i) {
case EQEQ:
i = eq(p1, p2);
break;
case NOTEQ:
i = !eq(p1, p2);
break;
case EQMATCH:
i = Gmatch(p1, p2);
break;
case NOTEQMATCH:
i = !Gmatch(p1, p2);
break;
}
xfree((ptr_t) p1);
xfree((ptr_t) p2);
return (i);
}
i = egetn(p1);
xfree((ptr_t) p1);
return (i);
}
static Char *
exp3(vp, ignore)
register Char ***vp;
bool ignore;
{
register Char *p1, *p2;
register int i;
p1 = exp3a(vp, ignore);
#ifdef EDEBUG
etracc("exp3 p1", p1, vp);
#endif
if ((i = isa(**vp, RELOP)) != 0) {
(*vp)++;
if (**vp && eq(**vp, STRequal))
i |= 1, (*vp)++;
p2 = exp3(vp, ignore);
#ifdef EDEBUG
etracc("exp3 p2", p2, vp);
#endif
if (!(ignore & IGNORE))
switch (i) {
case GTR:
i = egetn(p1) > egetn(p2);
break;
case GTR | 1:
i = egetn(p1) >= egetn(p2);
break;
case LSS:
i = egetn(p1) < egetn(p2);
break;
case LSS | 1:
i = egetn(p1) <= egetn(p2);
break;
}
xfree((ptr_t) p1);
xfree((ptr_t) p2);
return (putn(i));
}
return (p1);
}
static Char *
exp3a(vp, ignore)
register Char ***vp;
bool ignore;
{
register Char *p1, *p2, *op;
register int i;
p1 = exp4(vp, ignore);
#ifdef EDEBUG
etracc("exp3a p1", p1, vp);
#endif
op = **vp;
if (op && any("<>", op[0]) && op[0] == op[1]) {
(*vp)++;
p2 = exp3a(vp, ignore);
#ifdef EDEBUG
etracc("exp3a p2", p2, vp);
#endif
if (op[0] == '<')
i = egetn(p1) << egetn(p2);
else
i = egetn(p1) >> egetn(p2);
xfree((ptr_t) p1);
xfree((ptr_t) p2);
return (putn(i));
}
return (p1);
}
static Char *
exp4(vp, ignore)
register Char ***vp;
bool ignore;
{
register Char *p1, *p2;
register int i = 0;
p1 = exp5(vp, ignore);
#ifdef EDEBUG
etracc("exp4 p1", p1, vp);
#endif
if (isa(**vp, ADDOP)) {
register Char *op = *(*vp)++;
p2 = exp4(vp, ignore);
#ifdef EDEBUG
etracc("exp4 p2", p2, vp);
#endif
if (!(ignore & IGNORE))
switch (op[0]) {
case '+':
i = egetn(p1) + egetn(p2);
break;
case '-':
i = egetn(p1) - egetn(p2);
break;
}
xfree((ptr_t) p1);
xfree((ptr_t) p2);
return (putn(i));
}
return (p1);
}
static Char *
exp5(vp, ignore)
register Char ***vp;
bool ignore;
{
register Char *p1, *p2;
register int i = 0;
p1 = exp6(vp, ignore);
#ifdef EDEBUG
etracc("exp5 p1", p1, vp);
#endif
if (isa(**vp, MULOP)) {
register Char *op = *(*vp)++;
p2 = exp5(vp, ignore);
#ifdef EDEBUG
etracc("exp5 p2", p2, vp);
#endif
if (!(ignore & IGNORE))
switch (op[0]) {
case '*':
i = egetn(p1) * egetn(p2);
break;
case '/':
i = egetn(p2);
if (i == 0)
stderror(ERR_DIV0);
i = egetn(p1) / i;
break;
case '%':
i = egetn(p2);
if (i == 0)
stderror(ERR_MOD0);
i = egetn(p1) % i;
break;
}
xfree((ptr_t) p1);
xfree((ptr_t) p2);
return (putn(i));
}
return (p1);
}
static Char *
exp6(vp, ignore)
register Char ***vp;
bool ignore;
{
int ccode, i = 0;
register Char *cp, *dp, *ep;
if (**vp == 0)
stderror(ERR_NAME | ERR_EXPRESSION);
if (eq(**vp, STRbang)) {
(*vp)++;
cp = exp6(vp, ignore);
#ifdef EDEBUG
etracc("exp6 ! cp", cp, vp);
#endif
i = egetn(cp);
xfree((ptr_t) cp);
return (putn(!i));
}
if (eq(**vp, STRtilde)) {
(*vp)++;
cp = exp6(vp, ignore);
#ifdef EDEBUG
etracc("exp6 ~ cp", cp, vp);
#endif
i = egetn(cp);
xfree((ptr_t) cp);
return (putn(~i));
}
if (eq(**vp, STRLparen)) {
(*vp)++;
ccode = exp0(vp, ignore);
#ifdef EDEBUG
etraci("exp6 () ccode", ccode, vp);
#endif
if (*vp == 0 || **vp == 0 || ***vp != ')')
stderror(ERR_NAME | ERR_EXPRESSION);
(*vp)++;
return (putn(ccode));
}
if (eq(**vp, STRLbrace)) {
register Char **v;
struct command faket;
Char *fakecom[2];
faket.t_dtyp = NODE_COMMAND;
faket.t_dflg = F_BACKQ;
faket.t_dcar = faket.t_dcdr = faket.t_dspr = NULL;
faket.t_dcom = fakecom;
fakecom[0] = STRfakecom;
fakecom[1] = NULL;
(*vp)++;
v = *vp;
for (;;) {
if (!**vp)
stderror(ERR_NAME | ERR_MISSING, '}');
if (eq(*(*vp)++, STRRbrace))
break;
}
if (ignore & IGNORE)
return (Strsave(STRNULL));
psavejob();
if (pfork(&faket, -1) == 0) {
*--(*vp) = 0;
evalav(v);
exitstat();
}
pwait();
prestjob();
#ifdef EDEBUG
etraci("exp6 {} status", egetn(value(STRstatus)), vp);
#endif
return (putn(egetn(value(STRstatus)) == 0));
}
if (isa(**vp, ANYOP))
return (Strsave(STRNULL));
cp = *(*vp)++;
#define FILETESTS "erwxfdzoplstSX"
if (*cp == '-' && any(FILETESTS, cp[1])) {
struct stat stb;
Char *ft;
for (ft = &cp[2]; *ft; ft++)
if (!any(FILETESTS, *ft))
stderror(ERR_NAME | ERR_FILEINQ);
/*
* Detect missing file names by checking for operator in the file name
* position. However, if an operator name appears there, we must make
* sure that there's no file by that name (e.g., "/") before announcing
* an error. Even this check isn't quite right, since it doesn't take
* globbing into account.
*/
if (isa(**vp, ANYOP) && stat(short2str(**vp), &stb))
stderror(ERR_NAME | ERR_FILENAME);
dp = *(*vp)++;
if (ignore & IGNORE)
return (Strsave(STRNULL));
ep = globone(dp, G_ERROR);
ft = &cp[1];
do
switch (*ft) {
case 'r':
i = !sh_access(ep, R_OK);
break;
case 'w':
i = !sh_access(ep, W_OK);
break;
case 'x':
i = !sh_access(ep, X_OK);
break;
case 'X': /* tcsh extension, name is an executable in the path
* or a tcsh builtin command
*/
i = find_cmd(ep, 0);
break;
case 't': /* SGI extension, true when file is a tty */
i = isatty(atoi(short2str(ep)));
break;
default:
if (
#ifdef S_IFLNK
*ft == 'l' ? lstat(short2str(ep), &stb) :
#endif
stat(short2str(ep), &stb)) {
xfree((ptr_t) ep);
return (Strsave(STR0));
}
switch (*ft) {
case 'f':
#ifdef S_ISREG
i = S_ISREG(stb.st_mode);
#else
i = 0;
#endif
break;
case 'd':
#ifdef S_ISDIR
i = S_ISDIR(stb.st_mode);
#else
i = 0;
#endif
break;
case 'p':
#ifdef S_ISFIFO
i = S_ISFIFO(stb.st_mode);
#else
i = 0;
#endif
break;
case 'l':
#ifdef S_ISLNK
i = S_ISLNK(stb.st_mode);
#else
i = 0;
#endif
break;
case 'S':
# ifdef S_ISSOCK
i = S_ISSOCK(stb.st_mode);
# else
i = 0;
# endif
break;
case 'b':
#ifdef S_ISBLK
i = S_ISBLK(stb.st_mode);
#else
i = 0;
#endif
break;
case 'c':
#ifdef S_ISCHR
i = S_ISCHR(stb.st_mode);
#else
i = 0;
#endif
break;
case 'u':
#ifdef S_ISUID
i = (S_ISUID & stb.st_mode) != 0;
#else
i = 0;
#endif
break;
case 'g':
#ifdef S_ISGID
i = (S_ISGID & stb.st_mode) != 0;
#else
i = 0;
#endif
break;
case 'k':
#ifdef S_ISVTX
i = (S_ISVTX & stb.st_mode) != 0;
#else
i = 0;
#endif
break;
case 'z':
i = stb.st_size == 0;
break;
case 's':
i = stb.st_size != 0;
break;
case 'e':
i = 1;
break;
case 'o':
i = stb.st_uid == uid;
break;
}
}
while (*++ft && i);
#ifdef EDEBUG
etraci("exp6 -? i", i, vp);
#endif
xfree((ptr_t) ep);
return (putn(i));
}
#ifdef EDEBUG
etracc("exp6 default", cp, vp);
#endif
return (ignore & NOGLOB ? Strsave(cp) : globone(cp, G_ERROR));
}
static void
evalav(v)
register Char **v;
{
struct wordent paraml1;
register struct wordent *hp = &paraml1;
struct command *t;
register struct wordent *wdp = hp;
set(STRstatus, Strsave(STR0), VAR_READWRITE);
hp->prev = hp->next = hp;
hp->word = STRNULL;
while (*v) {
register struct wordent *new =
(struct wordent *) xcalloc(1, sizeof *wdp);
new->prev = wdp;
new->next = hp;
wdp->next = new;
wdp = new;
wdp->word = Strsave(*v++);
}
hp->prev = wdp;
alias(&paraml1);
t = syntax(paraml1.next, &paraml1, 0);
if (seterr)
stderror(ERR_OLD);
execute(t, -1, NULL, NULL);
freelex(&paraml1), freesyn(t);
}
static int
isa(cp, what)
register Char *cp;
register int what;
{
if (cp == 0)
return ((what & RESTOP) != 0);
if (cp[1] == 0) {
if (what & ADDOP && (*cp == '+' || *cp == '-'))
return (1);
if (what & MULOP && (*cp == '*' || *cp == '/' || *cp == '%'))
return (1);
if (what & RESTOP && (*cp == '(' || *cp == ')' || *cp == '!' ||
*cp == '~' || *cp == '^' || *cp == '"'))
return (1);
}
else if (cp[2] == 0) {
if (what & RESTOP) {
if (cp[0] == '|' && cp[1] == '&')
return (1);
if (cp[0] == '<' && cp[1] == '<')
return (1);
if (cp[0] == '>' && cp[1] == '>')
return (1);
}
if (what & EQOP) {
if (cp[0] == '=') {
if (cp[1] == '=')
return (EQEQ);
if (cp[1] == '~')
return (EQMATCH);
}
else if (cp[0] == '!') {
if (cp[1] == '=')
return (NOTEQ);
if (cp[1] == '~')
return (NOTEQMATCH);
}
}
}
if (what & RELOP) {
if (*cp == '<')
return (LSS);
if (*cp == '>')
return (GTR);
}
return (0);
}
static int
egetn(cp)
register Char *cp;
{
if (*cp && *cp != '-' && !Isdigit(*cp))
stderror(ERR_NAME | ERR_EXPRESSION);
return (getn(cp));
}
/* Phew! */
#ifdef EDEBUG
static void
etraci(str, i, vp)
char *str;
int i;
Char ***vp;
{
xprintf("%s=%d\t", str, i);
blkpr(*vp);
xputchar('\n');
}
static void
etracc(str, cp, vp)
char *str;
Char *cp;
Char ***vp;
{
xprintf("%s=%s\t", str, cp);
blkpr(*vp);
xputchar('\n');
}
#endif
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