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freebsd/contrib/tcsh/sh.exp.c
Mark Peek a15e6f9a9a Update to tcsh 6.17.00. 
Approved by:	re (kensmith)
2009-07-11 05:35:08 +00:00

1053 lines
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/* $Header: /p/tcsh/cvsroot/tcsh/sh.exp.c,v 3.53 2007/10/01 19:09:28 christos 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. 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("$tcsh: sh.exp.c,v 3.53 2007/10/01 19:09:28 christos Exp $")
#include "tw.h"
/*
* C shell
*/
#define TEXP_IGNORE 1 /* in ignore, it means to ignore value, just parse */
#define TEXP_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 (const Char *, int);
static int exp1 (Char ***, int);
static int exp2x (Char ***, int);
static int exp2a (Char ***, int);
static int exp2b (Char ***, int);
static int exp2c (Char ***, int);
static Char *exp3 (Char ***, int);
static Char *exp3a (Char ***, int);
static Char *exp4 (Char ***, int);
static Char *exp5 (Char ***, int);
static Char *exp6 (Char ***, int);
static void evalav (Char **);
static int isa (Char *, int);
static int egetn (Char *);
#ifdef EDEBUG
static void etracc (const char *, const Char *, Char ***);
static void etraci (const char *, int, Char ***);
#else /* !EDEBUG */
#define etracc(A, B, C) ((void)0)
#define etraci(A, B, C) ((void)0)
#endif /* !EDEBUG */
/*
* shell access function according to POSIX and non POSIX
* From Beto Appleton (beto@aixwiz.aix.ibm.com)
*/
static int
sh_access(const Char *fname, int mode)
{
#if defined(POSIX) && !defined(USE_ACCESS)
struct stat statb;
#endif /* POSIX */
char *name = short2str(fname);
if (*name == '\0')
return 1;
#if !defined(POSIX) || defined(USE_ACCESS)
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 {
/* you can be in several groups */
long n;
GETGROUPS_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.
*/
# if defined (HAVE_SYSCONF) && defined (_SC_NGROUPS_MAX)
if ((n = sysconf(_SC_NGROUPS_MAX)) == -1)
# endif /* _SC_NGROUPS_MAX */
n = NGROUPS_MAX;
if (n <= 0)
n = getgroups(0, (GETGROUPS_T *) NULL);
if (n > 0) {
groups = xmalloc(n * sizeof(*groups));
n = getgroups((int) 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(Char ***vp)
{
return (exp0(vp, 0));
}
int
exp0(Char ***vp, int ignore)
{
int p1 = exp1(vp, ignore);
etraci("exp0 p1", p1, vp);
while (**vp && eq(**vp, STRor2)) {
int p2;
(*vp)++;
p2 = compat_expr ?
exp0(vp, (ignore & TEXP_IGNORE) || p1) :
exp1(vp, (ignore & TEXP_IGNORE) || p1);
if (compat_expr || !(ignore & TEXP_IGNORE))
p1 = (p1 || p2);
etraci("exp0 p1", p1, vp);
if (compat_expr)
break;
}
return (p1);
}
static int
exp1(Char ***vp, int ignore)
{
int p1 = exp2x(vp, ignore);
etraci("exp1 p1", p1, vp);
while (**vp && eq(**vp, STRand2)) {
int p2;
(*vp)++;
p2 = compat_expr ?
exp1(vp, (ignore & TEXP_IGNORE) || !p1) :
exp2x(vp, (ignore & TEXP_IGNORE) || !p1);
etraci("exp1 p2", p2, vp);
if (compat_expr || !(ignore & TEXP_IGNORE))
p1 = (p1 && p2);
etraci("exp1 p1", p1, vp);
if (compat_expr)
break;
}
return (p1);
}
static int
exp2x(Char ***vp, int ignore)
{
int p1 = exp2a(vp, ignore);
etraci("exp2x p1", p1, vp);
while (**vp && eq(**vp, STRor)) {
int p2;
(*vp)++;
p2 = compat_expr ?
exp2x(vp, ignore) :
exp2a(vp, ignore);
etraci("exp2x p2", p2, vp);
if (compat_expr || !(ignore & TEXP_IGNORE))
p1 = (p1 | p2);
etraci("exp2x p1", p1, vp);
if (compat_expr)
break;
}
return (p1);
}
static int
exp2a(Char ***vp, int ignore)
{
int p1 = exp2b(vp, ignore);
etraci("exp2a p1", p1, vp);
while (**vp && eq(**vp, STRcaret)) {
int p2;
(*vp)++;
p2 = compat_expr ?
exp2a(vp, ignore) :
exp2b(vp, ignore);
etraci("exp2a p2", p2, vp);
if (compat_expr || !(ignore & TEXP_IGNORE))
p1 = (p1 ^ p2);
etraci("exp2a p1", p1, vp);
if (compat_expr)
break;
}
return (p1);
}
static int
exp2b(Char ***vp, int ignore)
{
int p1 = exp2c(vp, ignore);
etraci("exp2b p1", p1, vp);
while (**vp && eq(**vp, STRand)) {
int p2;
(*vp)++;
p2 = compat_expr ?
exp2b(vp, ignore) :
exp2c(vp, ignore);
etraci("exp2b p2", p2, vp);
if (compat_expr || !(ignore & TEXP_IGNORE))
p1 = (p1 & p2);
etraci("exp2b p1", p1, vp);
if (compat_expr)
break;
}
return (p1);
}
static int
exp2c(Char ***vp, int ignore)
{
Char *p1 = exp3(vp, ignore);
Char *p2;
int i;
cleanup_push(p1, xfree);
etracc("exp2c p1", p1, vp);
if ((i = isa(**vp, EQOP)) != 0) {
(*vp)++;
if (i == EQMATCH || i == NOTEQMATCH)
ignore |= TEXP_NOGLOB;
p2 = exp3(vp, ignore);
cleanup_push(p2, xfree);
etracc("exp2c p2", p2, vp);
if (!(ignore & TEXP_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;
}
cleanup_until(p1);
return (i);
}
i = egetn(p1);
cleanup_until(p1);
return (i);
}
static Char *
exp3(Char ***vp, int ignore)
{
Char *p1, *p2;
int i;
p1 = exp3a(vp, ignore);
etracc("exp3 p1", p1, vp);
while ((i = isa(**vp, RELOP)) != 0) {
(*vp)++;
if (**vp && eq(**vp, STRequal))
i |= 1, (*vp)++;
cleanup_push(p1, xfree);
p2 = compat_expr ?
exp3(vp, ignore) :
exp3a(vp, ignore);
cleanup_push(p2, xfree);
etracc("exp3 p2", p2, vp);
if (!(ignore & TEXP_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;
}
cleanup_until(p1);
p1 = putn(i);
etracc("exp3 p1", p1, vp);
if (compat_expr)
break;
}
return (p1);
}
static Char *
exp3a(Char ***vp, int ignore)
{
Char *p1, *p2;
const Char *op;
int i;
p1 = exp4(vp, ignore);
etracc("exp3a p1", p1, vp);
op = **vp;
if (op && any("<>", op[0]) && op[0] == op[1]) {
(*vp)++;
cleanup_push(p1, xfree);
p2 = compat_expr ?
exp3a(vp, ignore) :
exp4(vp, ignore);
cleanup_push(p2, xfree);
etracc("exp3a p2", p2, vp);
if (op[0] == '<')
i = egetn(p1) << egetn(p2);
else
i = egetn(p1) >> egetn(p2);
cleanup_until(p1);
p1 = putn(i);
etracc("exp3a p1", p1, vp);
}
return (p1);
}
static Char *
exp4(Char ***vp, int ignore)
{
Char *p1, *p2;
int i = 0;
p1 = exp5(vp, ignore);
etracc("exp4 p1", p1, vp);
while (isa(**vp, ADDOP)) {
const Char *op = *(*vp)++;
cleanup_push(p1, xfree);
p2 = compat_expr ?
exp4(vp, ignore) :
exp5(vp, ignore);
cleanup_push(p2, xfree);
etracc("exp4 p2", p2, vp);
if (!(ignore & TEXP_IGNORE))
switch (op[0]) {
case '+':
i = egetn(p1) + egetn(p2);
break;
case '-':
i = egetn(p1) - egetn(p2);
break;
}
cleanup_until(p1);
p1 = putn(i);
etracc("exp4 p1", p1, vp);
if (compat_expr)
break;
}
return (p1);
}
static Char *
exp5(Char ***vp, int ignore)
{
Char *p1, *p2;
int i = 0;
p1 = exp6(vp, ignore);
etracc("exp5 p1", p1, vp);
while (isa(**vp, MULOP)) {
const Char *op = *(*vp)++;
if ((ignore & TEXP_NOGLOB) != 0) {
/*
* We are just trying to get the right side of
* a =~ or !~ operator
*/
xfree(p1);
return Strsave(op);
}
cleanup_push(p1, xfree);
p2 = compat_expr ?
exp5(vp, ignore) :
exp6(vp, ignore);
cleanup_push(p2, xfree);
etracc("exp5 p2", p2, vp);
if (!(ignore & TEXP_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;
}
cleanup_until(p1);
p1 = putn(i);
etracc("exp5 p1", p1, vp);
if (compat_expr)
break;
}
return (p1);
}
static Char *
exp6(Char ***vp, int ignore)
{
int ccode, i = 0;
Char *cp;
if (**vp == 0)
stderror(ERR_NAME | ERR_EXPRESSION);
if (eq(**vp, STRbang)) {
(*vp)++;
cp = exp6(vp, ignore);
cleanup_push(cp, xfree);
etracc("exp6 ! cp", cp, vp);
i = egetn(cp);
cleanup_until(cp);
return (putn(!i));
}
if (eq(**vp, STRtilde)) {
(*vp)++;
cp = exp6(vp, ignore);
cleanup_push(cp, xfree);
etracc("exp6 ~ cp", cp, vp);
i = egetn(cp);
cleanup_until(cp);
return (putn(~i));
}
if (eq(**vp, STRLparen)) {
(*vp)++;
ccode = exp0(vp, ignore);
etraci("exp6 () ccode", ccode, vp);
if (**vp == 0 || ***vp != ')')
stderror(ERR_NAME | ERR_EXPRESSION);
(*vp)++;
return (putn(ccode));
}
if (eq(**vp, STRLbrace)) {
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 & TEXP_IGNORE)
return (Strsave(STRNULL));
psavejob();
cleanup_push(&faket, psavejob_cleanup); /* faket is only a marker */
if (pfork(&faket, -1) == 0) {
*--(*vp) = 0;
evalav(v);
exitstat();
}
pwait();
cleanup_until(&faket);
etraci("exp6 {} status", egetn(varval(STRstatus)), vp);
return (putn(egetn(varval(STRstatus)) == 0));
}
if (isa(**vp, ANYOP))
return (Strsave(STRNULL));
cp = *(*vp)++;
#ifdef convex
# define FILETESTS "erwxfdzoplstSXLbcugkmKR"
#else
# define FILETESTS "erwxfdzoplstSXLbcugkmK"
#endif /* convex */
#define FILEVALS "ZAMCDIUGNFPL"
if (*cp == '-' && (any(FILETESTS, cp[1]) || any(FILEVALS, cp[1])))
return(filetest(cp, vp, ignore));
etracc("exp6 default", cp, vp);
return (ignore & TEXP_NOGLOB ? Strsave(cp) : globone(cp, G_APPEND));
}
/*
* Extended file tests
* From: John Rowe <rowe@excc.exeter.ac.uk>
*/
Char *
filetest(Char *cp, Char ***vp, int ignore)
{
#ifdef convex
struct cvxstat stb, *st = NULL;
# define TCSH_STAT stat64
#else
# define TCSH_STAT stat
struct stat stb, *st = NULL;
#endif /* convex */
#ifdef S_IFLNK
# ifdef convex
struct cvxstat lstb, *lst = NULL;
# define TCSH_LSTAT lstat64
# else
# define TCSH_LSTAT lstat
struct stat lstb, *lst = NULL;
# endif /* convex */
char *filnam;
#endif /* S_IFLNK */
int i = 0;
unsigned pmask = 0xffff;
int altout = 0;
Char *ft = cp, *dp, *ep, *strdev, *strino, *strF, *str, valtest = '\0',
*errval = STR0;
char *string, string0[8];
time_t footime;
struct passwd *pw;
struct group *gr;
while(any(FILETESTS, *++ft))
continue;
if (!*ft && *(ft - 1) == 'L')
--ft;
if (any(FILEVALS, *ft)) {
valtest = *ft++;
/*
* Value tests return '-1' on failure as 0 is
* a legitimate value for many of them.
* 'F' returns ':' for compatibility.
*/
errval = valtest == 'F' ? STRcolon : STRminus1;
if (valtest == 'P' && *ft >= '0' && *ft <= '7') {
pmask = (char) *ft - '0';
while ( *++ft >= '0' && *ft <= '7' )
pmask = 8 * pmask + ((char) *ft - '0');
}
if (Strcmp(ft, STRcolon) == 0 && any("AMCUGP", valtest)) {
altout = 1;
++ft;
}
}
if (*ft || ft == cp + 1)
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) && TCSH_STAT(short2str(**vp), &stb))
stderror(ERR_NAME | ERR_FILENAME);
dp = *(*vp)++;
if (ignore & TEXP_IGNORE)
return (Strsave(STRNULL));
ep = globone(dp, G_APPEND);
cleanup_push(ep, xfree);
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:
#ifdef S_IFLNK
if (tolower(*ft) == 'l') {
/*
* avoid convex compiler bug.
*/
if (!lst) {
lst = &lstb;
if (TCSH_LSTAT(short2str(ep), lst) == -1) {
cleanup_until(ep);
return (Strsave(errval));
}
}
if (*ft == 'L')
st = lst;
}
else
#endif /* S_IFLNK */
/*
* avoid convex compiler bug.
*/
if (!st) {
st = &stb;
if (TCSH_STAT(short2str(ep), st) == -1) {
cleanup_until(ep);
return (Strsave(errval));
}
}
switch (*ft) {
case 'f':
#ifdef S_ISREG
i = S_ISREG(st->st_mode);
#else /* !S_ISREG */
i = 0;
#endif /* S_ISREG */
break;
case 'd':
#ifdef S_ISDIR
i = S_ISDIR(st->st_mode);
#else /* !S_ISDIR */
i = 0;
#endif /* S_ISDIR */
break;
case 'p':
#ifdef S_ISFIFO
i = S_ISFIFO(st->st_mode);
#else /* !S_ISFIFO */
i = 0;
#endif /* S_ISFIFO */
break;
case 'm' :
#ifdef S_ISOFL
i = S_ISOFL(st->st_dm_mode);
#else /* !S_ISOFL */
i = 0;
#endif /* S_ISOFL */
break ;
case 'K' :
#ifdef S_ISOFL
i = stb.st_dm_key;
#else /* !S_ISOFL */
i = 0;
#endif /* S_ISOFL */
break ;
case 'l':
#ifdef S_ISLNK
i = S_ISLNK(lst->st_mode);
#else /* !S_ISLNK */
i = 0;
#endif /* S_ISLNK */
break;
case 'S':
# ifdef S_ISSOCK
i = S_ISSOCK(st->st_mode);
# else /* !S_ISSOCK */
i = 0;
# endif /* S_ISSOCK */
break;
case 'b':
#ifdef S_ISBLK
i = S_ISBLK(st->st_mode);
#else /* !S_ISBLK */
i = 0;
#endif /* S_ISBLK */
break;
case 'c':
#ifdef S_ISCHR
i = S_ISCHR(st->st_mode);
#else /* !S_ISCHR */
i = 0;
#endif /* S_ISCHR */
break;
case 'u':
i = (S_ISUID & st->st_mode) != 0;
break;
case 'g':
i = (S_ISGID & st->st_mode) != 0;
break;
case 'k':
i = (S_ISVTX & st->st_mode) != 0;
break;
case 'z':
i = st->st_size == 0;
break;
#ifdef convex
case 'R':
i = (stb.st_dmonflags & IMIGRATED) == IMIGRATED;
break;
#endif /* convex */
case 's':
i = stb.st_size != 0;
break;
case 'e':
i = 1;
break;
case 'o':
i = st->st_uid == uid;
break;
/*
* Value operators are a tcsh extension.
*/
case 'D':
i = (int) st->st_dev;
break;
case 'I':
i = (int) st->st_ino;
break;
case 'F':
strdev = putn( (int) st->st_dev);
strino = putn( (int) st->st_ino);
strF = xmalloc((2 + Strlen(strdev) + Strlen(strino))
* sizeof(Char));
(void) Strcat(Strcat(Strcpy(strF, strdev), STRcolon), strino);
xfree(strdev);
xfree(strino);
cleanup_until(ep);
return(strF);
case 'L':
if ( *(ft + 1) ) {
i = 1;
break;
}
#ifdef S_ISLNK
filnam = short2str(ep);
string = areadlink(filnam);
strF = string == NULL ? errval : str2short(string);
xfree(string);
cleanup_until(ep);
return(Strsave(strF));
#else /* !S_ISLNK */
i = 0;
break;
#endif /* S_ISLNK */
case 'N':
i = (int) st->st_nlink;
break;
case 'P':
string = string0 + 1;
(void) xsnprintf(string, sizeof(string0) - 1, "%o",
pmask & (unsigned int)
((S_IRWXU|S_IRWXG|S_IRWXO|S_ISUID|S_ISGID) & st->st_mode));
if (altout && *string != '0')
*--string = '0';
cleanup_until(ep);
return(Strsave(str2short(string)));
case 'U':
if (altout && (pw = xgetpwuid(st->st_uid))) {
cleanup_until(ep);
return(Strsave(str2short(pw->pw_name)));
}
i = (int) st->st_uid;
break;
case 'G':
if (altout && (gr = xgetgrgid(st->st_gid))) {
cleanup_until(ep);
return(Strsave(str2short(gr->gr_name)));
}
i = (int) st->st_gid;
break;
case 'Z':
i = (int) st->st_size;
break;
case 'A': case 'M': case 'C':
footime = *ft == 'A' ? st->st_atime :
*ft == 'M' ? st->st_mtime : st->st_ctime;
if (altout) {
strF = str2short(ctime(&footime));
if ((str = Strchr(strF, '\n')) != NULL)
*str = (Char) '\0';
cleanup_until(ep);
return(Strsave(strF));
}
i = (int) footime;
break;
}
}
while (*++ft && i);
etraci("exp6 -? i", i, vp);
cleanup_until(ep);
return (putn(i));
}
static void
evalav(Char **v)
{
struct wordent paraml1;
struct wordent *hp = &paraml1;
struct command *t;
struct wordent *wdp = hp;
setcopy(STRstatus, STR0, VAR_READWRITE);
hp->prev = hp->next = hp;
hp->word = STRNULL;
while (*v) {
struct wordent *new = xcalloc(1, sizeof *wdp);
new->prev = wdp;
new->next = hp;
wdp->next = new;
wdp = new;
wdp->word = Strsave(*v++);
}
hp->prev = wdp;
cleanup_push(&paraml1, lex_cleanup);
alias(&paraml1);
t = syntax(paraml1.next, &paraml1, 0);
cleanup_push(t, syntax_cleanup);
if (seterr)
stderror(ERR_OLD);
execute(t, -1, NULL, NULL, TRUE);
cleanup_until(&paraml1);
}
static int
isa(Char *cp, int what)
{
if (cp == 0)
return ((what & RESTOP) != 0);
if (*cp == '\0')
return 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(Char *cp)
{
if (*cp && *cp != '-' && !Isdigit(*cp))
stderror(ERR_NAME | ERR_EXPRESSION);
return (getn(cp));
}
/* Phew! */
#ifdef EDEBUG
static void
etraci(const char *str, int i, Char ***vp)
{
xprintf("%s=%d\t", str, i);
blkpr(*vp);
xputchar('\n');
}
static void
etracc(const char *str, const Char *cp, Char ***vp)
{
xprintf("%s=%S\t", str, cp);
blkpr(*vp);
xputchar('\n');
}
#endif /* EDEBUG */
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