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sh.exp.c

/* $Header: /p/tcsh/cvsroot/tcsh/sh.exp.c,v 3.55 2010/01/26 20:03:17 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 3.55 2010/01/26 20:03:17 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      tcsh_number_t  exp1           (Char ***, int);
static      tcsh_number_t  exp2x    (Char ***, int);
static      tcsh_number_t  exp2a    (Char ***, int);
static      tcsh_number_t  exp2b    (Char ***, int);
static      tcsh_number_t  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      tcsh_number_t  egetn    (const Char *);

#ifdef EDEBUG
static      void     etracc   (const char *, const Char *, Char ***);
static      void     etraci   (const char *, tcsh_number_t, 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 */
}

tcsh_number_t
expr(Char ***vp)
{
    return (exp0(vp, 0));
}

tcsh_number_t
exp0(Char ***vp, int ignore)
{
    tcsh_number_t 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 tcsh_number_t
exp1(Char ***vp, int ignore)
{
    tcsh_number_t p1 = exp2x(vp, ignore);

    etraci("exp1 p1", p1, vp);
    while (**vp && eq(**vp, STRand2)) {
      tcsh_number_t 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 tcsh_number_t
exp2x(Char ***vp, int ignore)
{
    tcsh_number_t p1 = exp2a(vp, ignore);

    etraci("exp2x p1", p1, vp);
    while (**vp && eq(**vp, STRor)) {
      tcsh_number_t 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 tcsh_number_t
exp2a(Char ***vp, int ignore)
{
    tcsh_number_t p1 = exp2b(vp, ignore);

    etraci("exp2a p1", p1, vp);
    while (**vp && eq(**vp, STRcaret)) {
      tcsh_number_t 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 tcsh_number_t
exp2b(Char ***vp, int ignore)
{
    tcsh_number_t p1 = exp2c(vp, ignore);

    etraci("exp2b p1", p1, vp);
    while (**vp && eq(**vp, STRand)) {
      tcsh_number_t 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 tcsh_number_t
exp2c(Char ***vp, int ignore)
{
    Char *p1 = exp3(vp, ignore);
    Char *p2;
    tcsh_number_t 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;
    tcsh_number_t 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;
    tcsh_number_t 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;
    tcsh_number_t 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;
    tcsh_number_t 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)
{
    tcsh_number_t ccode;
    tcsh_number_t 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 */

    tcsh_number_t 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 = (tcsh_number_t) st->st_dev;
            break;

          case 'I':
            i = (tcsh_number_t) 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 = (tcsh_number_t) 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 = (tcsh_number_t) st->st_uid;
            break;

          case 'G':
            if (altout && (gr = xgetgrgid(st->st_gid))) {
                cleanup_until(ep);
                return(Strsave(str2short(gr->gr_name)));
            }
            i = (tcsh_number_t) st->st_gid;
            break;

          case 'Z':
            i = (tcsh_number_t) 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 = (tcsh_number_t) 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 tcsh_number_t
egetn(const Char *cp)
{
    if (*cp && *cp != '-' && !Isdigit(*cp))
      stderror(ERR_NAME | ERR_EXPRESSION);
    return (getn(cp));
}

/* Phew! */

#ifdef EDEBUG
static void
etraci(const char *str, tcsh_number_t i, Char ***vp)
{
#ifdef HAVE_LONG_LONG
    xprintf("%s=%lld\t", str, i);
#else
    xprintf("%s=%ld\t", str, i);
#endif
    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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