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name.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1982-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                  David Korn <dgk@research.att.com>                   *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * AT&T Labs
 *
 */

#include    "defs.h"
#include    <ctype.h>
#include    "variables.h"
#include    "path.h"
#include    "lexstates.h"
#include    "timeout.h"
#include    "FEATURE/locale"
#include    "FEATURE/externs"

#if !_lib_pathnative && _lib_uwin_path

#define _lib_pathnative       1

extern int  uwin_path(const char*, char*, int);

size_t
pathnative(const char* path, char* buf, size_t siz)
{
      return uwin_path(path, buf, siz);
}

#endif /* _lib_pathnative */

static void attstore(Namval_t*,void*);
#ifndef _ENV_H
static void pushnam(Namval_t*,void*);
static char *staknam(Namval_t*, char*);
#endif
static void ltou(const char*,char*);
static void rightjust(char*, int, int);

struct adata
{
      char    **argnam;
      int     attsize;
      char    *attval;
};

char        nv_local = 0;
#ifndef _ENV_H
static void(*nullscan)(Namval_t*,void*);
#endif

#if ( SFIO_VERSION  <= 20010201L )
#   define _data        data
#endif

/* ======== name value pair routines      ======== */

#include    "shnodes.h"
#include    "builtins.h"

static char *getbuf(size_t len)
{
      static char *buf;
      static size_t buflen;
      if(buflen < len)
      {
            if(buflen==0)
                  buf = (char*)malloc(len);
            else
                  buf = (char*)realloc(buf,len);
            buflen = len;
      }
      return(buf);
}

#ifdef _ENV_H
void sh_envput(Env_t* ep,Namval_t *np)
{
      int offset = staktell();
      Namarr_t *ap = nv_arrayptr(np);
      char *val;
      if(ap)
      {
            if(ap->nelem&ARRAY_UNDEF)
                  nv_putsub(np,"0",0L);
            else if(!(val=nv_getsub(np)) || strcmp(val,"0"))
                  return;
      }
      if(!(val = nv_getval(np)))
            return;
      stakputs(nv_name(np));
      stakputc('=');
      stakputs(val);
      stakseek(offset);
      env_add(ep,stakptr(offset),ENV_STRDUP);
}
#endif

/*
 * output variable name in format for re-input
 */
void nv_outname(Sfio_t *out, char *name, int len)
{
      const char *cp=name, *sp;
      int c, offset = staktell();
      while(sp= strchr(cp,'['))
      {
            if(len>0 && cp+len < sp)
                  break;
            sfwrite(out,cp,++sp-cp);
            stakseek(offset);
            for(; c= *sp; sp++)
            {
                  if(c==']')
                        break;
                  else if(c=='\\')
                  {
                        if(*sp=='[' || *sp==']' || *sp=='\\')
                              c = *sp++;
                  }
                  stakputc(c);
            }
            stakputc(0);
            sfputr(out,sh_fmtq(stakptr(offset)),-1);
            if(len>0)
            {
                  sfputc(out,']');
                  return;
            }
            cp = sp;
      }
      if(*cp)
      {
            if(len>0)
                  sfwrite(out,cp,len);
            else
                  sfputr(out,cp,-1);
      }
      stakseek(offset);
}

/*
 * Perform parameter assignment for a linked list of parameters
 * <flags> contains attributes for the parameters
 */
void nv_setlist(register struct argnod *arg,register int flags)
{
      register char *cp;
      register Namval_t *np;
      char *trap=sh.st.trap[SH_DEBUGTRAP];
      int traceon = (sh_isoption(SH_XTRACE)!=0);
      if(sh_isoption(SH_ALLEXPORT))
            flags |= NV_EXPORT;
      if(sh.prefix)
      {
            flags &= ~(NV_IDENT|NV_EXPORT);
            flags |= NV_VARNAME;
      }
      for(;arg; arg=arg->argnxt.ap)
      {
            sh.used_pos = 0;
            if(arg->argflag&ARG_MAC)
                  cp = sh_mactrim(arg->argval,-1);
            else
            {
                  Namval_t *mp;
                  stakseek(0);
                  if(*arg->argval==0 && arg->argchn.ap && !(arg->argflag&~(ARG_APPEND|ARG_QUOTED)))
                  {
#if SHOPT_COMPOUND_ARRAY
                        int flag = (NV_VARNAME|NV_ASSIGN);
#else
                        int flag = (NV_VARNAME|NV_ARRAY|NV_ASSIGN);
#endif /* SHOPT_COMPOUND_ARRAY */
                        struct fornod *fp=(struct fornod*)arg->argchn.ap;
                        register Shnode_t *tp=fp->fortre;
                        char *prefix = sh.prefix;
                        flag |= (flags&NV_NOSCOPE);
                        if(arg->argflag&ARG_QUOTED)
                              cp = sh_mactrim(fp->fornam,-1);
                        else
                              cp = fp->fornam;
                        error_info.line = fp->fortyp-sh.st.firstline;
                        if(sh.fn_depth && (Namval_t*)tp->com.comnamp==SYSTYPESET)
                                  flag |= NV_NOSCOPE;
                        if(prefix)
                              *--cp = '.';
                        np = nv_open(cp,sh.var_tree,flag);
                        if(prefix)
                              *cp++ = 0;
                        /* check for array assignment */
                        if(tp->tre.tretyp!=TLST && tp->com.comarg && !tp->com.comset)
                        {
                              int argc;
                              char **argv = sh_argbuild(&argc,&tp->com,0);
                              if(!(arg->argflag&ARG_APPEND))
                                    nv_unset(np);
                              nv_setvec(np,(arg->argflag&ARG_APPEND),argc,argv);
                              if(traceon || trap)
                              {
                                    int n = -1;
                                    char *name = nv_name(np);
                                    if(arg->argflag&ARG_APPEND)
                                          n = '+';
                                    if(trap)
                                          sh_debug(trap,name,(char*)0,argv,(arg->argflag&ARG_APPEND)|ARG_ASSIGN);
                                    if(traceon)
                                    {
                                          sh_trace(NIL(char**),0);
                                          sfputr(sfstderr,name,n);
                                          sfwrite(sfstderr,"=( ",3);
                                          while(cp= *argv++)
                                                sfputr(sfstderr,sh_fmtq(cp),' ');
                                          sfwrite(sfstderr,")\n",2);
                                    }
                              }
                              continue;
                        }
                        if(tp->tre.tretyp==TLST || !tp->com.comset || tp->com.comset->argval[0]!='[')
                        {
#if SHOPT_COMPOUND_ARRAY
                              if(*cp!='[' && strchr(cp,'['))
                              {
                                    nv_close(np);
                                    np = nv_open(cp,sh.var_tree,flag);
                              }
#endif /* SHOPT_COMPOUND_ARRAY */
                              if((arg->argflag&ARG_APPEND) && !nv_isarray(np))
                                    nv_unset(np);
                        }
                        else
                        {
                              if(sh_isoption(SH_BASH))
                              {
                                    if(!(arg->argflag&ARG_APPEND))
                                          nv_unset(np);
                              }
                              else if((arg->argflag&ARG_APPEND) && (!nv_isarray(np) || (nv_aindex(np)>=0)))
                              {
                                    nv_unset(np);
                                    nv_setarray(np,nv_associative);
                              }
                              else
                                    nv_setarray(np,nv_associative);
                        }
                        if(prefix)
                        {
                              int offset=0;
                              stakputs(prefix);
                              stakputc('.');
                              if(*cp=='[')
                                    offset = staktell()+1;
                              stakputs(cp);
                              if(offset && sh_checkid(stakptr(offset),(char*)0))
                                    stakseek(staktell()-2);
                              cp = stakfreeze(1);
                        }
                        sh.prefix = cp;
                        sh_exec(tp,sh_isstate(SH_ERREXIT));
                        sh.prefix = prefix;
                        if(nv_isarray(np) && (mp=nv_opensub(np)))
                              np = mp;
                        if(nv_isnull(np))
                              nv_setvtree(np);
                        continue;
                  }
                  cp = arg->argval;
            }
            if(sh.prefix && *cp=='.' && cp[1]=='=')
                  cp++;
            np = nv_open(cp,sh.var_tree,flags);
            if(!np->nvfun)
            {
                  if(sh.used_pos)
                        nv_onattr(np,NV_PARAM);
                  else
                        nv_offattr(np,NV_PARAM);
            }
            if(traceon || trap)
            {
                  register char *sp=cp;
                  char *name=nv_name(np);
                  char *sub=0;
                  int append = 0;
                  if(nv_isarray(np))
                        sub = nv_getsub(np);
                  if(cp=strchr(sp,'='))
                  {
                        if(cp[-1]=='+')
                              append = ARG_APPEND;
                        cp++;
                  }
                  if(traceon)
                  {
                        sh_trace(NIL(char**),0);
                        nv_outname(sfstderr,name,-1);
                        if(sub)
                              sfprintf(sfstderr,"[%s]",sh_fmtq(sub));
                        if(cp)
                        {
                              if(append)
                                    sfputc(sfstderr,'+');
                              sfprintf(sfstderr,"=%s\n",sh_fmtq(cp));
                        }
                  }
                  if(trap)
                  {
                              char *av[2];
                              av[0] = cp;
                              av[1] = 0;
                              sh_debug(trap,name,sub,av,append);
                  }
            }
      }
}

/*
 * copy the subscript onto the stack
 */
static void stak_subscript(const char *sub, int last)
{
      register int c;
      stakputc('[');
      while(c= *sub++)
      {
            if(c=='[' || c==']' || c=='\\')
                  stakputc('\\');
            stakputc(c);
      }
      stakputc(last);
}

/*
 * construct a new name from a prefix and base name on the stack
 */
static char *copystack(const char *prefix, register const char *name, const char *sub)
{
      register int last=0,offset = staktell();
      if(prefix)
      {
            stakputs(prefix);
            if(*name=='.' && name[1]=='[')
                  last = staktell()+2;
            if(*name!='[' && *name!='.' && *name!='=' && *name!='+')
                  stakputc('.');
      }
      stakputs(name);
      if(last && sh_checkid(stakptr(last),(char*)0))
            stakseek(staktell()-2);
      if(sub)
            stak_subscript(sub,']');
      stakputc(0);
      return(stakptr(offset));
}

Namval_t *nv_create(const char *name, Dt_t *root, int flags, Namfun_t *dp)
{
      register char           *cp=(char*)name, *sp;
      register int            c;
      register Namval_t *np=0, *nq;
      Namfun_t          *fp=0;
      long              mode, add=0;
      int               copy=1,isref,top=0,noscope=(flags&NV_NOSCOPE);
      Dt_t              *funtree= 0;
      if(root==sh.var_tree)
      {
            if(dtvnext(root))
                  top = 1;
            else
                  flags &= ~NV_NOSCOPE;
      }
      else if(root==sh_subfuntree(1))
            funtree = root;
      if(!dp->disc)
            copy = dp->nofree;
      if(*cp=='.')
            cp++;
      while(1)
      {
            switch(c = *(unsigned char*)(sp = cp))
            {
                case '[':
                  cp = nv_endsubscript((Namval_t*)0,sp,0);
                  if(sp==name || sp[-1]=='.')
                        c = *(sp = cp);
                  goto skip;
                case '.':
                  if(flags&NV_IDENT)
                        return(0);
                  if(root==sh.var_tree)
                        flags &= ~NV_EXPORT;
                  if(!copy && !(flags&NV_NOREF))
                  {
                        c = sp-name;
                        copy = cp-name;
                        name = copystack((const char*)0, name,(const char*)0);
                        cp = (char*)name+copy;
                        sp = (char*)name+c;
                        c = '.';
                  }
                  if(funtree)
                  {
                        root = sh.var_tree;
                        flags &= ~NV_NOSCOPE;
                  }
            skip:
                case '+':
                case '=':
                  *sp = 0;
                case 0:
                  isref = 0;
                  dp->last = cp;
                  mode =  (c=='.' || (flags&NV_NOADD))?add:NV_ADD;
                  if(flags&NV_NOSCOPE)
                        mode |= HASH_NOSCOPE;
                  if(top)
                        nq = nv_search(name,sh.var_base,0);
                  if(np = nv_search(name,root,mode))
                  {
                        isref = nv_isref(np);
                        if(top)
                        {
                              if(nq==np)
                                    flags &= ~NV_NOSCOPE;
                              else if(nq)
                              {
                                    if(nv_isnull(np) && c!='.')
                                          np->nvfun=nv_cover(nq);
                                    flags |= NV_NOSCOPE;
                              }
                        }
                        else if(add && nv_isnull(np) && c=='.')
                              nv_setvtree(np);
                  }
                  if(c)
                        *sp = c;
                  top = 0;
                  if(isref)
                  {
                        char *sub;
                        if(c=='.') /* don't optimize */
                              sh.argaddr = 0;
                        else if(flags&NV_NOREF)
                        {
                              if(c)
                                    nv_unref(np);
                              return(np);
                        }
                        while(nv_isref(np))
                        {
                              sub = np->nvenv;
                              sh.last_table = nv_table(np);
                              np = nv_refnode(np);
                              if(sub && c!='.')
                                    nv_putsub(np,sub,0L);
                        }
                        if(c)
                        {
                              c = (cp-sp);
                              copy = strlen(cp=nv_name(np));
                              name = copystack(cp,sp,sub);
                              sp = (char*)name + copy;
                              cp = sp+c;
                              c = *sp;
                        }
                        flags |= NV_NOREF;
                  }
                  do
                  {
                        if(!np)
                              return(np);
                        if(c!='.')
                        {
                              if(c=='[')
                              {
                                    dp->last = cp = nv_endsubscript(np,sp,mode|nv_isarray(np));
                                    c = *cp;
                                    
                              }
                              else if(nv_isarray(np))
                                    nv_putsub(np,NIL(char*),ARRAY_UNDEF);
                              if(c!='.')
                                    return(np);
                        }
                        if(!funtree && (fp=np->nvfun))
                        {
                              for(; fp; fp=fp->next)
                              {
                                    if(fp->disc && fp->disc->createf)
                                          break;
                              }
                              if(fp)
                              {
                                    if((nq = (*fp->disc->createf)(np,cp+1,flags,fp)) == np)
                                    {
                                          add = NV_ADD;
                                          break;
                                    }
                                    else if(np=nq)
                                          c = *(cp=dp->last=fp->last);
                              }
                        }
                  }
                  while(c!='.');
                  if(funtree)
                  {
                        root = funtree;
                        flags |= noscope;
                  }
                  cp++;
                  break;
                default:
                  dp->last = cp;
                  if(!isaletter(c))
                        return(np);
                  while(c= *(unsigned char*)(++cp),isaname(c));
            }
      }
      return(np);
}

/*
 * Put <arg> into associative memory.
 * If <flags> & NV_NOARRAY then subscript is not allowed
 * If <flags> & NV_NOSCOPE then use the current scope only
 * If <flags> & NV_ASSIGN then assignment is allowed
 * If <flags> & NV_IDENT then name must be an identifier
 * If <flags> & NV_VARNAME then name must be a valid variable name
 * If <flags> & NV_NOADD then node will not be added if not found
 * If <flags> & NV_NOREF then don't follow reference
 * If <flags> & NV_NOFAIL then don't generate an error message on failure
 * SH_INIT is only set while initializing the environment
 */
Namval_t *nv_open(const char *name, Dt_t *root, int flags)
{
      register char           *cp=(char*)name;
      register int            c;
      register Namval_t *np;
      Namfun_t          fun;
      int               append=0, copy=0;
      const char        *msg = e_varname;

      sh.last_table = sh.namespace;
      if(!root)
            root = sh.var_tree;
      if(root==sh_subfuntree(1))
      {
            flags |= NV_NOREF;
            msg = e_funname;
            if(sh.namespace && !strchr(name,'.'))
            {
                  name = cp = copystack(nv_name(sh.namespace),name,(const char*)0);
                  copy = 1;
                  flags &=  ~NV_IDENT;
            }
      }
      else if(!(flags&(NV_IDENT|NV_VARNAME|NV_ASSIGN)))
      {
            long mode = ((flags&NV_NOADD)?0:NV_ADD);
            if(flags&NV_NOSCOPE)
                  mode |= HASH_SCOPE|HASH_NOSCOPE;
            np = nv_search(name,root,mode);
            if(np && !(flags&NV_REF))
            {
                  while(nv_isref(np))
                  {
                        sh.last_table = nv_table(np);
                        np = nv_refnode(np);
                  }
            }
            return(np);
      }
      else if(sh.prefix && (flags&NV_ASSIGN))
      {
            name = cp = copystack(sh.prefix,name,(const char*)0);
            copy = 1;
      }
      c = *(unsigned char*)cp;
      if(root==sh.alias_tree)
      {
            msg = e_aliname;
            while((c= *(unsigned char*)cp++) && (c!='=') && (c!='/') &&
                  (c>=0x200 || !(c=sh_lexstates[ST_NORM][c]) || c==S_EPAT));
            if(sh.subshell && c=='=')
                  root = sh_subaliastree(1);
            if(c= *--cp)
                  *cp = 0;
            np = nv_search(name, root, (flags&NV_NOADD)?0:NV_ADD); 
            if(c)
                  *cp = c;
            goto skip;
      }
      else if(flags&NV_IDENT)
            msg = e_ident;
      else if(c=='.')
      {
            c = *++cp;
            flags |= NV_NOREF;
            if(root==sh.var_tree)
                  root = sh.var_base;
            sh.last_table = 0;
      }
      if(c= !isaletter(c))
            goto skip;
      fun.disc = 0;
      fun.nofree = copy;
      np = nv_create(name, root, flags, &fun);
      if(*(cp=fun.last)=='+' && cp[1]=='=')
      {
            append=NV_APPEND;
            cp++;
      }
      c = *cp;
skip:
      if(c=='=' && np && (flags&NV_ASSIGN))
      {
            cp++;
            if(sh_isstate(SH_INIT))
            {
                  nv_putval(np, cp, NV_RDONLY);
                  if(np==PWDNOD)
                        nv_onattr(np,NV_TAGGED);
            }
            else
            {
                  c = msg==e_aliname? 0: (append | (flags&NV_EXPORT)); 
                  nv_putval(np, cp, c);
            }
            nv_onattr(np, flags&NV_ATTRIBUTES);
      }
      else if(c)
      {
            if(flags&NV_NOFAIL)
                  return(0);
            if(c=='.')
                  msg = e_noparent;
            errormsg(SH_DICT,ERROR_exit(1),msg,name);
      }
      return(np);
}

#if SHOPT_MULTIBYTE
    static char *savep;
    static char savechars[8+1];
    static int ja_size(char*, int, int);
    static void ja_restore(void);
#endif /* SHOPT_MULTIBYTE */

/*
 * put value <string> into name-value node <np>.
 * If <np> is an array, then the element given by the
 *   current index is assigned to.
 * If <flags> contains NV_RDONLY, readonly attribute is ignored
 * If <flags> contains NV_INTEGER, string is a pointer to a number
 * If <flags> contains NV_NOFREE, previous value is freed, and <string>
 * becomes value of node and <flags> becomes attributes
 */
void nv_putval(register Namval_t *np, const char *string, int flags)
{
      register const char *sp=string;
      register union Value *up;
      register char *cp;
      register int size = 0;
      register int dot;
      int   was_local = nv_local;
      if(!(flags&NV_RDONLY) && nv_isattr (np, NV_RDONLY))
            errormsg(SH_DICT,ERROR_exit(1),e_readonly, nv_name(np));
      /* The following could cause the shell to fork if assignment
       * would cause a side effect
       */
      sh.argaddr = 0;
      if(sh.subshell && !nv_local)
            np = sh_assignok(np,1);
      if(np->nvfun && !nv_isattr(np,NV_REF))
      {
            /* This function contains disc */
            if(!nv_local)
            {
                  nv_local=1;
                  nv_putv(np,sp,flags,np->nvfun);
                  if((flags&NV_EXPORT) || nv_isattr(np,NV_EXPORT))
                        sh_envput(sh.env,np);
                  return;
            }
            /* called from disc, assign the actual value */
      }
      flags &= ~NV_NODISC;
      if(flags&(NV_NOREF|NV_NOFREE))
      {
            if(!nv_isnull(np))
                  nv_unset(np);
            nv_local=0;
            np->nvalue.cp = (char*)sp;
            nv_setattr(np,(flags&~NV_RDONLY)|NV_NOFREE);
            return;
      }
      nv_local=0;
      up= &np->nvalue;
#if !SHOPT_BSH
      if(nv_isattr(np,NV_EXPORT))
            nv_offattr(np,NV_IMPORT);
      else if(!nv_isattr(np,NV_MINIMAL))
            np->nvenv = 0;
#endif /* SHOPT_BSH */
      if(nv_isattr (np, NV_INTEGER))
      {
            if(nv_isattr(np, NV_DOUBLE))
            {
                  if(nv_isattr(np, NV_LONG) && sizeof(double)<sizeof(Sfdouble_t))
                  {
                        Sfdouble_t ld, old=0;
                        if(flags&NV_INTEGER)
                        {
                              if(flags&NV_LONG)
                                    ld = *((Sfdouble_t*)sp);
                              else if(flags&NV_SHORT)
                                    ld = *((float*)sp);
                              else
                                    ld = *((double*)sp);
                        }
                        else
                              ld = sh_arith(sp);
                        if(!up->ldp)
                              up->ldp = new_of(Sfdouble_t,0);
                        else if(flags&NV_APPEND)
                              old = *(up->ldp);
                        *(up->ldp) = ld+old;
                  }
                  else
                  {
                        double d,od=0;
                        if(flags&NV_INTEGER)
                        {
                              if(flags&NV_LONG)
                                    d = (double)(*(Sfdouble_t*)sp);
                              else if(flags&NV_SHORT)
                                    d = (double)(*(float*)sp);
                              else
                                    d = *(double*)sp;
                        }
                        else
                              d = sh_arith(sp);
                        if(!up->dp)
                              up->dp = new_of(double,0);
                        else if(flags&NV_APPEND)
                              od = *(up->dp);
                        *(up->dp) = d+od;
                  }
            }
            else
            {
                  if(nv_isattr(np, NV_LONG) && sizeof(long)<sizeof(Sflong_t))
                  {
                        Sflong_t ll=0,oll=0;
                        if(flags&NV_INTEGER)
                        {
                              if(flags&NV_DOUBLE)
                              {
                                    if(flags&NV_LONG)
                                          ll = *((Sfdouble_t*)sp);
                                    else if(flags&NV_SHORT)
                                          ll = *((float*)sp);
                                    else
                                          ll = *((double*)sp);
                              }
                              else
                              {
                                    if(flags&NV_LONG)
                                          ll = *((Sflong_t*)sp);
                                    else if(flags&NV_SHORT)
                                          ll = *((short*)sp);
                                    else
                                          ll = *((long*)sp);
                              }
                        }
                        else if(sp)
                              ll = (Sflong_t)sh_arith(sp);
                        if(!up->llp)
                              up->llp = new_of(Sflong_t,0);
                        else if(flags&NV_APPEND)
                              oll = *(up->llp);
                        *(up->llp) = ll+oll;
                  }
                  else
                  {
                        long l=0,ol=0;
                        if(flags&NV_INTEGER)
                        {
                              if(flags&NV_DOUBLE)
                              {
                                    Sflong_t ll;
                                    if(flags&NV_LONG)
                                          ll = *((Sfdouble_t*)sp);
                                    else if(flags&NV_SHORT)
                                          ll = *((float*)sp);
                                    else
                                          ll = *((double*)sp);
                                    l = (long)ll;
                              }
                              else
                              {
                                    if(flags&NV_LONG)
                                          l = *((Sflong_t*)sp);
                                    else if(flags&NV_SHORT)
                                          l = *((short*)sp);
                                    else
                                          l = *(long*)sp;
                              }
                        }
                        else if(sp)
                        {
                              Sfdouble_t ld = sh_arith(sp);
                              if(ld<0)
                                    l = (long)ld;
                              else
                                    l = (unsigned long)ld;
                        }
                        if(nv_size(np) <= 1)
                              nv_setsize(np,10);
                        if(nv_isattr (np, NV_SHORT))
                        {
                              short s=0;
                              if(flags&NV_APPEND)
                                    s = up->s;
                              up->s = s+(short)l;
                              nv_onattr(np,NV_NOFREE);
                        }
                        else
                        {
                              if(!up->lp)
                                    up->lp = new_of(long,0);
                              else if(flags&NV_APPEND)      
                                    ol =  *(up->lp);
                              *(up->lp) = l+ol;
                        }
                  }
            }
      }
      else
      {
            const char *tofree=0;
            char numbuf[40];
            int offset;
#if _lib_pathnative
            char buff[PATH_MAX];
#endif /* _lib_pathnative */
            if(flags&NV_INTEGER)
            {
                  if(flags&NV_DOUBLE)
                  {
                        if(flags&NV_LONG)
                              sfsprintf(numbuf,sizeof(numbuf),"%.*Lg\0",12,*((Sfdouble_t*)sp));
                        else
                              sfsprintf(numbuf,sizeof(numbuf),"%.*g\0",12,*((double*)sp));
                  }
                  else if(flags&NV_LONG)
                        sfsprintf(numbuf,sizeof(numbuf),"%lld\0",*((Sflong_t*)sp));
                  else
                        sfsprintf(numbuf,sizeof(numbuf),"%ld\0",*((long*)sp));
                  sp = numbuf;
            }
            if(nv_isattr(np, NV_HOST)==NV_HOST && sp)
            {
#ifdef _lib_pathnative
                  /*
                   * return the host file name given the UNIX name
                   */
                  pathnative(sp,buff,sizeof(buff));
                  if(buff[1]==':' && buff[2]=='/')
                  {
                        buff[2] = '\\';
                        if(*buff>='A' &&  *buff<='Z')
                              *buff += 'a'-'A';
                  }
                  sp = buff;
#else
                  ;
#endif /* _lib_pathnative */
            }
            else if((nv_isattr(np, NV_RJUST|NV_ZFILL|NV_LJUST)) && sp)
            {
                  for(;*sp == ' '|| *sp=='\t';sp++);
                  if((nv_isattr(np,NV_ZFILL)) && (nv_isattr(np,NV_LJUST)))
                        for(;*sp=='0';sp++);
                  size = nv_size(np);
#if SHOPT_MULTIBYTE
                  if(size)
                        size = ja_size((char*)sp,size,nv_isattr(np,NV_RJUST|NV_ZFILL));
#endif /* SHOPT_MULTIBYTE */
            }
            if(!up->cp)
                  flags &= ~NV_APPEND;
            if((flags&NV_APPEND) && !nv_isattr(np,NV_BINARY))
            {
                  offset = staktell();
                  stakputs(up->cp);
                  stakputs(sp);
                  stakputc(0);
                  sp = stakptr(offset);
            }
            if(!nv_isattr(np, NV_NOFREE))
            {
                  /* delay free in case <sp> points into free region */
                  tofree = up->cp;
            }
            nv_offattr(np,NV_NOFREE);
                  if (sp)
            {
                  dot = strlen(sp);
#if (_AST_VERSION>=20030127L)
                  if(nv_isattr(np,NV_BINARY))
                  {
                        int oldsize = (flags&NV_APPEND)?nv_size(np):0;
                        if(flags&NV_RAW)
                        {
                              if(tofree)
                                    free((void*)tofree);
                              up->cp = sp;
                              return;
                        }
                        size = 0;
                        if(nv_isattr(np,NV_ZFILL))
                              size = nv_size(np);
                        if(size==0)
                              size = oldsize + (3*dot/4);
                        cp = (char*)malloc(size+1);
                        if(oldsize)
                              memcpy((void*)cp,(void*)up->cp,oldsize);
                        up->cp = cp;
                        if(size <= oldsize)
                              return;
                        dot = base64decode(sp,dot, (void**)0, cp+oldsize, size-oldsize,(void**)0);
                        dot += oldsize;
                        if(!nv_isattr(np,NV_ZFILL) || nv_size(np)==0)
                              nv_setsize(np,dot);
                        else if(nv_isattr(np,NV_ZFILL) && (size>dot))
                              memset((void*)&cp[dot],0,size-dot);
                        return;
                  }
                  else
#endif
                  if(size==0 && nv_isattr(np,NV_LJUST|NV_RJUST|NV_ZFILL))
                        nv_setsize(np,size=dot);
                  else if(size > dot)
                        dot = size;
                  cp = (char*)malloc(((unsigned)dot+1));
            }
            else
                  cp = 0;
            up->cp = cp;
            if(sp)
            {
                  if(nv_isattr(np, NV_LTOU))
                        ltou(sp,cp);
                  else if(nv_isattr (np, NV_UTOL))
                        sh_utol(sp,cp);
                  else
                              strcpy(cp, sp);
                  if(nv_isattr(np, NV_RJUST) && nv_isattr(np, NV_ZFILL))
                        rightjust(cp,size,'0');
                  else if(nv_isattr(np, NV_RJUST))
                        rightjust(cp,size,' ');
                  else if(nv_isattr(np, NV_LJUST))
                  {
                        register char *dp;
                        dp = strlen (cp) + cp;
                        *(cp = (cp + size)) = 0;
                        for (; dp < cp; *dp++ = ' ');
                   }
#if SHOPT_MULTIBYTE
                  /* restore original string */
                  if(savep)
                        ja_restore();
#endif /* SHOPT_MULTIBYTE */
            }
            if(flags&NV_APPEND)
                  stakseek(offset);
            if(tofree)
                  free((void*)tofree);
      }
      if(!was_local && ((flags&NV_EXPORT) || nv_isattr(np,NV_EXPORT)))
            sh_envput(sh.env,np);
      return;
}

/*
 *
 *   Right-justify <str> so that it contains no more than
 *   <size> characters.  If <str> contains fewer than <size>
 *   characters, left-pad with <fill>.  Trailing blanks
 *   in <str> will be ignored.
 *
 *   If the leftmost digit in <str> is not a digit, <fill>
 *   will default to a blank.
 */
static void rightjust(char *str, int size, int fill)
{
      register int n;
      register char *cp,*sp;
      n = strlen(str);

      /* ignore trailing blanks */
      for(cp=str+n;n && *--cp == ' ';n--);
      if (n == size)
            return;
      if(n > size)
        {
            *(str+n) = 0;
            for (sp = str, cp = str+n-size; sp <= str+size; *sp++ = *cp++);
            return;
        }
      else *(sp = str+size) = 0;
      if (n == 0)  
        {
            while (sp > str)
                        *--sp = ' ';
            return;
        }
      while(n--)
      {
            sp--;
            *sp = *cp--;
      }
      if(!isdigit(*str))
            fill = ' ';
      while(sp>str)
            *--sp = fill;
      return;
}

#if SHOPT_MULTIBYTE
    /*
     * handle left and right justified fields for multi-byte chars
     * given physical size, return a logical size which reflects the
     * screen width of multi-byte characters
     * Multi-width characters replaced by spaces if they cross the boundary
     * <type> is non-zero for right justified  fields
     */

    static int ja_size(char *str,int size,int type)
    {
      register char *cp = str;
      register int c, n=size;
      register int outsize;
      register char *oldcp=cp;
      int oldn;
      wchar_t w;
      while(*cp)
      {
            oldn = n;
            w = mbchar(cp);
            outsize = mbwidth(w);
            size -= outsize;
            c = cp-oldcp;
            n += (c-outsize);
            oldcp = cp;
            if(size<=0 && type==0)
                  break;
      }
      /* check for right justified fields that need truncating */
      if(size <0)
      {
            if(type==0)
            {
                  /* left justified and character crosses field boundary */
                  n = oldn;
                  /* save boundary char and replace with spaces */
                  size = c;
                  savechars[size] = 0;
                  while(size--)
                  {
                        savechars[size] = cp[size];
                        cp[size] = ' ';
                  }
                  savep = cp;
            }
            size = -size;
            if(type)
                  n -= (ja_size(str,size,0)-size);
      }
      return(n);
    }

    static void ja_restore(void)
    {
      register char *cp = savechars;
      while(*cp)
            *savep++ = *cp++;
      savep = 0;
    }
#endif /* SHOPT_MULTIBYTE */

#ifndef _ENV_H
static char *staknam(register Namval_t *np, char *value)
{
      register char *p,*q;
      q = stakalloc(strlen(nv_name(np))+(value?strlen(value):0)+2);
      p=strcopy(q,nv_name(np));
      if(value)
      {
            *p++ = '=';
            strcpy(p,value);
      }
      return(q);
}
#endif

/*
 * put the name and attribute into value of attributes variable
 */
#ifdef _ENV_H
static void attstore(register Namval_t *np, void *data)
{
      register int flag, c = ' ';
      NOT_USED(data);
      if(!(nv_isattr(np,NV_EXPORT)))
            return;
      flag = nv_isattr(np,NV_RDONLY|NV_UTOL|NV_LTOU|NV_RJUST|NV_LJUST|NV_ZFILL|NV_INTEGER);
      stakputc('=');
      if((flag&NV_DOUBLE) && (flag&NV_INTEGER))
      {
            /* export doubles as integers for ksh88 compatibility */
            stakputc(c+(flag&~(NV_DOUBLE|NV_EXPNOTE)));
      }
      else
      {
            stakputc(c+flag);
            if(flag&NV_INTEGER)
                  c +=  nv_size(np);
      }
      stakputc(c);
      stakputs(nv_name(np));
}
#else
static void attstore(register Namval_t *np, void *data)
{
      register int flag = np->nvflag;
      register struct adata *ap = (struct adata*)data;
      if(!(flag&NV_EXPORT) || (flag&NV_FUNCT))
            return;
      flag &= (NV_RDONLY|NV_UTOL|NV_LTOU|NV_RJUST|NV_LJUST|NV_ZFILL|NV_INTEGER);
      *ap->attval++ = '=';
      if((flag&NV_DOUBLE) && (flag&NV_INTEGER))
      {
            /* export doubles as integers for ksh88 compatibility */
            *ap->attval++ = ' '+(flag&~(NV_DOUBLE|NV_EXPNOTE));
            *ap->attval = ' ';
      }
      else
      {
            *ap->attval++ = ' '+flag;
            if(flag&NV_INTEGER)
                  *ap->attval = ' ' + nv_size(np);
            else
                  *ap->attval = ' ';
      }
      ap->attval = strcopy(++ap->attval,nv_name(np));
}
#endif

#ifndef _ENV_H
static void pushnam(Namval_t *np, void *data)
{
      register char *value;
      register struct adata *ap = (struct adata*)data;
      if(nv_isattr(np,NV_IMPORT))
      {
            if(np->nvenv)
                  *ap->argnam++ = np->nvenv;
      }
      else if(value=nv_getval(np))
            *ap->argnam++ = staknam(np,value);
      if(nv_isattr(np,NV_RDONLY|NV_UTOL|NV_LTOU|NV_RJUST|NV_LJUST|NV_ZFILL|NV_INTEGER))
            ap->attsize += (strlen(nv_name(np))+4);
}
#endif

/*
 * Generate the environment list for the child.
 */

#ifdef _ENV_H
char **sh_envgen(void)
{
      int offset,tell;
      register char **er;
      env_delete(sh.env,"_");
      er = env_get(sh.env);
      offset = staktell();
      stakputs(e_envmarker);
      tell = staktell();
      nv_scan(sh.var_tree, attstore,(void*)0,0,(NV_RDONLY|NV_UTOL|NV_LTOU|NV_RJUST|NV_LJUST|NV_ZFILL|NV_INTEGER));
      if(tell ==staktell())
            stakseek(offset);
      else
            *--er = stakfreeze(1)+offset;
      return(er);
}
#else
char **sh_envgen(void)
{
      register char **er;
      register int namec;
      register char *cp;
      struct adata data;
      /* L_ARGNOD gets generated automatically as full path name of command */
      nv_offattr(L_ARGNOD,NV_EXPORT);
      data.attsize = 6;
      namec = nv_scan(sh.var_tree,nullscan,(void*)0,NV_EXPORT,NV_EXPORT);
      er = (char**)stakalloc((namec+4)*sizeof(char*));
      data.argnam = (er+=2);
      nv_scan(sh.var_tree, pushnam,&data,NV_EXPORT, NV_EXPORT);
      *data.argnam = (char*)stakalloc(data.attsize);
      cp = data.attval = strcopy(*data.argnam,e_envmarker);
      nv_scan(sh.var_tree, attstore,&data,0,(NV_RDONLY|NV_UTOL|NV_LTOU|NV_RJUST|NV_LJUST|NV_ZFILL|NV_INTEGER));
      *data.attval = 0;
      if(cp!=data.attval)
            data.argnam++;
      *data.argnam = 0;
      return(er);
}
#endif

struct scan
{
      void    (*scanfn)(Namval_t*, void*);
      int     scanmask;
      int     scanflags;
      int     scancount;
      void    *scandata;
};


static int scanfilter(Dt_t *dict, void *arg, void *data)
{
      register Namval_t *np = (Namval_t*)arg;
      register int k=np->nvflag;
      register struct scan *sp = (struct scan*)data;
      NOT_USED(dict);
      if(sp->scanmask?(k&sp->scanmask)==sp->scanflags:(!sp->scanflags || (k&sp->scanflags)))
      {
            if(!np->nvalue.cp && !nv_isattr(np,~NV_DEFAULT))
                  return(0);
            if(sp->scanfn)
            {
                  if(nv_isarray(np))
                        nv_putsub(np,NIL(char*),0L);
                  (*sp->scanfn)(np,sp->scandata);
            }
            sp->scancount++;
      }
      return(0);
}

/*
 * Walk through the name-value pairs
 * if <mask> is non-zero, then only nodes with (nvflags&mask)==flags
 *    are visited
 * If <mask> is zero, and <flags> non-zero, then nodes with one or
 *    more of <flags> is visited
 * If <mask> and <flags> are zero, then all nodes are visted
 */
int nv_scan(Dt_t *root, void (*fn)(Namval_t*,void*), void *data,int mask, int flags)
{
      Dt_t *base=0;
      struct scan sdata;
      int (*hashfn)(Dt_t*, void*, void*);
      sdata.scanmask = mask;
      sdata.scanflags = flags&~NV_NOSCOPE;
      sdata.scanfn = fn;
      sdata.scancount = 0;
      sdata.scandata = data;
      hashfn = scanfilter;
      if(flags&NV_NOSCOPE)
            base = dtview((Dt_t*)root,0);
      dtwalk(root, hashfn,&sdata);
      if(base)
             dtview((Dt_t*)root,base);
      return(sdata.scancount);
}

/*
 * create a new environment scope
 */
void nv_scope(struct argnod *envlist)
{
      register Dt_t *newscope;
      newscope = dtopen(&_Nvdisc,Dtbag);
      dtview(newscope,(Dt_t*)sh.var_tree);
      sh.var_tree = (Dt_t*)newscope;
      nv_setlist(envlist,NV_EXPORT|NV_NOSCOPE|NV_IDENT|NV_ASSIGN);
}

/* 
 * Remove freeable local space associated with the nvalue field
 * of nnod. This includes any strings representing the value(s) of the
 * node, as well as its dope vector, if it is an array.
 */

void  sh_envnolocal (register Namval_t *np, void *data)
{
      char *cp=0;
      NOT_USED(data);
      if(nv_isattr(np,NV_EXPORT) && nv_isarray(np))
      {
            nv_putsub(np,NIL(char*),0);
            if(cp = nv_getval(np))
                  cp = strdup(cp);
      }
      if(nv_isattr(np,NV_EXPORT|NV_NOFREE))
      {
            if(nv_isref(np))
            {
                  nv_offattr(np,NV_NOFREE|NV_REF);
                  np->nvalue.cp = 0;
                  np->nvfun = 0;
            }
            if(!cp)
                  return;
      }
      if(nv_isarray(np))
            nv_putsub(np,NIL(char*),ARRAY_UNDEF);
      _nv_unset(np,NV_RDONLY);
      nv_setattr(np,0);
      if(cp)
      {
            nv_putval(np,cp,0);
            free((void*)cp);
      }
}

/*
 * Currently this is a dummy, but someday will be needed
 * for reference counting
 */
void  nv_close(Namval_t *np)
{
      NOT_USED(np);
}

static void table_unset(register Dt_t *root, int flags, Dt_t *oroot)
{
      register Namval_t *np,*nq;
      for(np=(Namval_t*)dtfirst(root);np;np=nq)
      {
            _nv_unset(np,flags);
            if(oroot && (nq=nv_search(nv_name(np),oroot,0)) && nv_isattr(nq,NV_EXPORT))
                  sh_envput(sh.env,nq);
            nq = (Namval_t*)dtnext(root,np);
            dtdelete(root,np);
            free((void*)np);
      }
}

/*
 *
 *   Set the value of <np> to 0, and nullify any attributes
 *   that <np> may have had.  Free any freeable space occupied
 *   by the value of <np>.  If <np> denotes an array member, it
 *   will retain its attributes.
 *   <flags> can contain NV_RDONLY to override the readonly attribute
 *    being cleared.
 */
void  _nv_unset(register Namval_t *np,int flags)
{
      register union Value *up;
      if(!(flags&NV_RDONLY) && nv_isattr (np,NV_RDONLY))
            errormsg(SH_DICT,ERROR_exit(1),e_readonly, nv_name(np));
      if(is_afunction(np) && np->nvalue.ip)
      {
            register struct slnod *slp = (struct slnod*)(np->nvenv);
            if(slp)
            {
                  /* free function definition */
                  register char *name=nv_name(np),*cp= strrchr(name,'.');
                  if(cp)
                  {
                        Namval_t *npv;
                        *cp = 0;
                         npv = nv_open(name,sh.var_tree,NV_ARRAY|NV_VARNAME|NV_NOADD);
                        *cp++ = '.';
                        if(npv)
                              nv_setdisc(npv,cp,NIL(Namval_t*),(Namfun_t*)npv);
                  }
                  stakdelete(slp->slptr);
                  free((void*)np->nvalue.ip);
                  np->nvalue.ip = 0;
            }
            goto done;
      }
      if(sh.subshell && !nv_isnull(np))
            np = sh_assignok(np,0);
      nv_offattr(np,NV_NODISC);
      if(np->nvfun && !nv_isref(np))
      {
            /* This function contains disc */
            if(!nv_local)
            {
                  nv_local=1;
                  nv_putv(np,NIL(char*),flags,np->nvfun);
                  return;
            }
            /* called from disc, assign the actual value */
            nv_local=0;
      }
      up = &np->nvalue;
      if(up->cp)
      {
            if(!nv_isattr (np, NV_NOFREE))
                  free((void*)up->cp);
            up->cp = 0;
      }
done:
      if(!nv_isarray(np) || !nv_arrayptr(np))
      {
            if(nv_isref(np))
            {
                  if(np->nvenv)
                        free((void*)np->nvenv);
                  np->nvfun = 0;
            }
            nv_setsize(np,0);
            if(!nv_isattr(np,NV_MINIMAL) || nv_isattr(np,NV_EXPORT))
            {
                  if(nv_isattr(np,NV_EXPORT))
                        env_delete(sh.env,nv_name(np));
                  np->nvenv = 0;
                  nv_setattr(np,0);
            }
            else
                  nv_setattr(np,NV_MINIMAL);
      }
}

void  nv_unset(register Namval_t *np)
{
      _nv_unset(np,0);
}

/*
 * return the node pointer in the highest level scope
 */
Namval_t *nv_scoped(register Namval_t *np)
{
      if(!dtvnext(sh.var_tree))
            return(np);
      return(dtsearch(sh.var_tree,np));
}

#if 1
/*
 * return space separated list of names of variables in given tree
 */
static char *tableval(Dt_t *root)
{
      static Sfio_t *out;
      register Namval_t *np;
      register int first=1;
      register Dt_t *base = dtview(root,0);
        if(out)
                sfseek(out,(Sfoff_t)0,SEEK_SET);
        else
                out =  sfnew((Sfio_t*)0,(char*)0,-1,-1,SF_WRITE|SF_STRING);
      for(np=(Namval_t*)dtfirst(root);np;np=(Namval_t*)dtnext(root,np))
      {
                if(!nv_isnull(np) || np->nvfun || nv_isattr(np,~NV_NOFREE))
            {
                  if(!first)
                        sfputc(out,' ');
                  else
                        first = 0;
                  sfputr(out,np->nvname,-1);
            }
      }
      sfputc(out,0);
      if(base)
            dtview(root,base);
      return((char*)out->_data);
}
#endif

#if SHOPT_OPTIMIZE
struct optimize
{
      Namfun_t    hdr;
      char        **ptr;
      struct optimize   *next;
      Namval_t    *np;
};

static struct optimize *opt_free;

static void optimize_clear(Namval_t* np, Namfun_t *fp)
{
      struct optimize *op = (struct optimize*)fp;
      nv_stack(np,fp);
      nv_stack(np,(Namfun_t*)0);
      for(;op && op->np==np; op=op->next)
      {
            if(op->ptr)
            {
                  *op->ptr = 0;
                  op->ptr = 0;
            }
      }
}

static void put_optimize(Namval_t* np,const char *val,int flags,Namfun_t *fp)
{
      nv_putv(np,val,flags,fp);
      optimize_clear(np,fp);
}

static const Namdisc_t optimize_disc  = {sizeof(struct optimize),put_optimize};

void nv_optimize(Namval_t *np)
{
      register Namfun_t *fp;
      register struct optimize *op, *xp;
      if(sh.argaddr)
      {
            for(fp=np->nvfun; fp; fp = fp->next)
            {
                  if(fp->disc->getnum || fp->disc->getval)
                  {
                        sh.argaddr = 0;
                        return;
                  }
                  if(fp->disc== &optimize_disc)
                        break;
            }
            if((xp= (struct optimize*)fp) && xp->ptr==sh.argaddr)
                  return;
            if(op = opt_free)
                  opt_free = op->next;
            else
                  op=(struct optimize*)calloc(1,sizeof(struct optimize));
            op->ptr = sh.argaddr;
            op->np = np;
            if(xp)
            {
                  op->hdr.disc = 0;
                  op->next = xp->next;
                  xp->next = op;
            }
            else
            {
                  op->hdr.disc = &optimize_disc;
                  op->next = (struct optimize*)sh.optlist;
                  sh.optlist = (void*)op;
                  nv_stack(np,&op->hdr);
            }
      }
}

void sh_optclear(Shell_t *shp, void *old)
{
      register struct optimize *op,*opnext;
      for(op=(struct optimize*)shp->optlist; op; op = opnext)
      {
            opnext = op->next;
            if(op->ptr && op->hdr.disc)
            {
                  nv_stack(op->np,&op->hdr);
                  nv_stack(op->np,(Namfun_t*)0);
            }
            op->next = opt_free;
            opt_free = op;
      }
      shp->optlist = old;
}

#else
#   define  optimize_clear(np,fp)
#endif /* SHOPT_OPTIMIZE */

/*
 *   Return a pointer to a character string that denotes the value
 *   of <np>.  If <np> refers to an array,  return a pointer to
 *   the value associated with the current index.
 *
 *   If the value of <np> is an integer, the string returned will
 *   be overwritten by the next call to nv_getval.
 *
 *   If <np> has no value, 0 is returned.
 */

char *nv_getval(register Namval_t *np)
{
      register union Value *up= &np->nvalue;
      register int numeric;
#if SHOPT_OPTIMIZE
      if(!nv_local && sh.argaddr)
            nv_optimize(np);
#endif /* SHOPT_OPTIMIZE */
      if(!np->nvfun && !nv_isattr(np,NV_ARRAY|NV_INTEGER|NV_FUNCT|NV_REF|NV_TABLE))
            goto done;
      if(nv_isref(np))
      {
            sh.last_table = nv_table(np);
            return(nv_name(up->np));
      }
      if(np->nvfun)
      {
            if(!nv_local)
            {
                  nv_local=1;
                  return(nv_getv(np, np->nvfun));
            }
            nv_local=0;
      }
      numeric = ((nv_isattr (np, NV_INTEGER)) != 0);
      if(numeric)
      {
            Sflong_t  ll;
            if(!up->cp)
                  return("0");
            if(nv_isattr (np,NV_DOUBLE))
            {
                  Sfdouble_t ld;
                  double d;
                  char *curbuf, *format;
                  long l = nv_size(np)+30;
                  curbuf = getbuf(l);
                  if(nv_isattr(np,NV_LONG))
                  {
                        ld = *up->ldp;
                        if(nv_isattr (np,NV_EXPNOTE))
                              format = "%.*Lg\0";
                        else
                              format = "%.*Lf\0";
                        sfsprintf(curbuf,l,format,nv_size(np),ld);
                  }
                  else
                  {
                        d = *up->dp;
                        if(nv_isattr (np,NV_EXPNOTE))
                              format = "%.*g\0";
                        else
                              format = "%.*f\0";
                        sfsprintf(curbuf,l,format,nv_size(np),d);
                  }
                  return(curbuf);
            }
            else if(nv_isattr (np,NV_LONG))
                  ll = *up->llp;
            else if(nv_isattr (np,NV_SHORT))
                  ll = up->s;
            else if(nv_isattr(np,NV_UNSIGN))
                  ll = (unsigned long)*(up->lp);
            else
                  ll = *(up->lp);
            if((numeric=nv_size(np))==10)
            {
                  if(nv_isattr(np,NV_UNSIGN))
                  {
                        char *cp=fmtbuf(36);
                        sfsprintf(cp,36,"%I*u",sizeof(ll),ll);
                        return(cp);
                  }
                  numeric = 0;
            }
            return(fmtbasell(ll,numeric, numeric&&numeric!=10));
      }
done:
#if (_AST_VERSION>=20030127L)
      /*
       * if NV_RAW flag is on, return pointer to binary data 
       * otherwise, base64 encode the data and return this string
       */
      if(up->cp && nv_isattr(np,NV_BINARY) && !nv_isattr(np,NV_RAW))
      {
            char *cp;
            int size= nv_size(np), insize=(4*size)/3+size/45+8;
            base64encode(up->cp, size, (void**)0, cp=getbuf(insize), insize, (void**)0); 
            return(cp);
      }
#endif
      return ((char*)up->cp);
}

Sfdouble_t nv_getnum(register Namval_t *np)
{
      register union Value *up;
      register Sfdouble_t r=0;
      register char *str;
#if SHOPT_OPTIMIZE
      if(!nv_local && sh.argaddr)
            nv_optimize(np);
#endif /* SHOPT_OPTIMIZE */
      if(nv_istable(np))
            errormsg(SH_DICT,ERROR_exit(1),e_number,nv_name(np));
      if(np->nvfun)
      {
            if(!nv_local)
            {
                  nv_local=1;
                  return(nv_getn(np, np->nvfun));
            }
            nv_local=0;
      }
      if(nv_isattr (np, NV_INTEGER))
      {
            up= &np->nvalue;
            if(!up->lp)
                  r = 0;
            else if(nv_isattr(np, NV_DOUBLE))
            {
                  if(nv_isattr(np, NV_LONG))
                              r = *up->ldp;
                  else
                              r = *up->dp;
            }
            else if(nv_isattr(np, NV_UNSIGN))
            {
                  if(nv_isattr(np, NV_LONG))
                        r = (Sflong_t)*((Sfulong_t*)up->llp);
                  else if(nv_isattr(np, NV_SHORT))
                        r = (Sflong_t)((unsigned short)up->s);
                  else
                        r = *((unsigned long*)up->lp);
            }
            else
            {
                  if(nv_isattr(np, NV_LONG))
                        r = *up->llp;
                  else if(nv_isattr(np, NV_SHORT))
                        r = up->s;
                  else
                        r = *up->lp;
            }
      }
      else if((str=nv_getval(np)) && *str!=0)
      {
            while(*str=='0')
                  str++;
            r = sh_arith(str);
      }
      return(r);
}
/*
 *   Give <np> the attributes <newatts,> and change its current
 *   value to conform to <newatts>.  The <size> of left and right
 *   justified fields may be given.
 */
void nv_newattr (register Namval_t *np, unsigned newatts, int size)
{
      register char *sp;
      register char *cp = 0;
      register unsigned int n;
      Namarr_t *ap = 0;
      int oldsize,oldatts;

      /* check for restrictions */
      if(sh_isoption(SH_RESTRICTED) && ((sp=nv_name(np))==nv_name(PATHNOD) || sp==nv_name(SHELLNOD) || sp==nv_name(ENVNOD) ))
            errormsg(SH_DICT,ERROR_exit(1),e_restricted,nv_name(np));
      /* handle attributes that do not change data separately */
      n = np->nvflag;
#if SHOPT_BSH
      if(newatts&NV_EXPORT)
            nv_offattr(np,NV_IMPORT);
#endif /* SHOPT_BSH */
      if(((n^newatts)&NV_EXPORT))
      {
            /* record changes to the environment */
            if(n&NV_EXPORT)
                  env_delete(sh.env,nv_name(np));
            else
                  sh_envput(sh.env,np);
      }
      if((size==0||(n&NV_INTEGER)) && ((n^newatts)&~NV_NOCHANGE)==0)
      {
            if(size)
                  nv_setsize(np,size);
            nv_offattr(np, ~NV_NOFREE);
            nv_onattr(np, newatts);
            return;
      }
      /* for an array, change all the elements */
      if((ap=nv_arrayptr(np)) && ap->nelem>0)
            nv_putsub(np,NIL(char*),ARRAY_SCAN);
      oldsize = nv_size(np);
      oldatts = np->nvflag;
      if(ap) /* add element to prevent array deletion */
            ap->nelem++;
      do
      {
            nv_setsize(np,oldsize);
            np->nvflag = oldatts;
            if (sp = nv_getval(np))
            {
                  if(nv_isattr(np,NV_ZFILL))
                        while(*sp=='0') sp++;
                  cp = (char*)malloc((n=strlen (sp)) + 1);
                  strcpy(cp, sp);
                  if(ap)
                  {
                        Namval_t *mp;
                        ap->nelem &= ~ARRAY_SCAN;
                        if(mp=nv_opensub(np))
                              nv_onattr(mp,NV_NOFREE);
                  }
                  nv_unset(np);
                  if(ap)
                        ap->nelem |= ARRAY_SCAN;
                  if(size==0 && (newatts&(NV_LJUST|NV_RJUST|NV_ZFILL)))
                        size = n;
            }
            else
                  nv_unset(np);
            nv_setsize(np,size);
            np->nvflag &= NV_ARRAY;
            np->nvflag |= newatts;
            if (cp)
            {
                  nv_putval (np, cp, NV_RDONLY);
                  free(cp);
            }
      }
      while(ap && nv_nextsub(np));
      if(ap)
            ap->nelem--;
      return;
}

#ifndef _NEXT_SOURCE
static char *oldgetenv(const char *string)
{
      register char c0,c1;
      register const char *cp, *sp;
      register char **av = environ;
      if(!string || (c0= *string)==0)
            return(0);
      if((c1=*++string)==0)
            c1= '=';
      while(cp = *av++)
      {
            if(cp[0]!=c0 || cp[1]!=c1) 
                  continue;
            sp = string;
            while(*sp && *sp++ == *++cp);
            if(*sp==0 && *++cp=='=')
                  return((char*)(cp+1));
      }
      return(0);
}

/*
 * This version of getenv the hash storage to access environment values
 */
char *getenv(const char *name)
/*@
      assume name!=0;
@*/ 
{
      register Namval_t *np;
      if(!sh.var_tree)
            return(oldgetenv(name));
      if((np = nv_search(name,sh.var_tree,0)) && nv_isattr(np,NV_EXPORT))
            return(nv_getval(np));
      return(0);
}
#endif /* _NEXT_SOURCE */

#undef putenv
/*
 * This version of putenv uses the hash storage to assign environment values
 */
int putenv(const char *name)
{
      register Namval_t *np;
      if(name)
      {
            np = nv_open(name,sh.var_tree,NV_EXPORT|NV_IDENT|NV_NOARRAY|NV_ASSIGN);
            if(!strchr(name,'='))
                  nv_unset(np);
      }
      return(0);
}


/*
 * Override libast setenv()
 */
char* setenviron(const char *name)
{
      register Namval_t *np;
      if(name)
      {
            np = nv_open(name,sh.var_tree,NV_EXPORT|NV_IDENT|NV_NOARRAY|NV_ASSIGN);
            if(strchr(name,'='))
                  return(nv_getval(np));
            nv_unset(np);
      }
      return("");
}

/*
 * copy <str1> to <str2> changing lower case to upper case
 * <str2> must be big enough to hold <str1>
 * <str1> and <str2> may point to the same place.
 */

static void ltou(register char const *str1,register char *str2)
/*@
      assume str1!=0 && str2!=0;
      return x satisfying strlen(in str1)==strlen(in str2);
@*/ 
{
      register int c;
      for(; c= *((unsigned char*)str1); str1++,str2++)
      {
            if(islower(c))
                  *str2 = toupper(c);
            else
                  *str2 = c;
      }
      *str2 = 0;
}

/*
 * normalize <cp> and return pointer to subscript if any
 */
static char *lastdot(register char *cp)
{
      register char *dp=cp, *ep=0;
      register int c;
      while(c= *cp++)
      {
            *dp++ = c;
            if(c=='[')
                  ep = cp;
            else if(c=='.')
            {
                  if(*cp=='[')
                  {
                        ep = nv_endsubscript((Namval_t*)0,cp,0);
                        c = ep-cp;
                        memcpy(dp,cp,c);
                        dp = sh_checkid(dp+1,dp+c);
                        cp = ep;
                  }
                  ep = 0;
            }
      }
      *dp = 0;
      return(ep);
}

/*
 * Create a reference node from <np>
 */
void nv_setref(register Namval_t *np)
{
      register Namval_t *nq, *nr;
      register char *ep,*cp;
      Dt_t *hp=sh.var_tree;
      if(nv_isref(np))
            return;
      if(nv_isarray(np))
            errormsg(SH_DICT,ERROR_exit(1),e_badref,nv_name(np));
      if(!(cp=nv_getval(np)))
            errormsg(SH_DICT,ERROR_exit(1),e_noref,nv_name(np));
      ep = lastdot(cp);
      if(nv_isattr(np,NV_PARAM))
      {
            if(sh.st.prevst && !(hp=(Dt_t*)sh.st.prevst->save_tree))
            {
                  if(!(hp=dtvnext(sh.var_tree)))
                        hp = sh.var_tree;
            }
      }
      nr= nq = nv_open(cp, hp, NV_VARNAME|NV_NOREF);
      while(nv_isref(nr))
      {
            sh.last_table = nv_table(nr);
            nr = nv_refnode(nr);
      }
      if(nr==np) 
      {
            if(sh.namespace && nv_dict(sh.namespace)==hp)
                  errormsg(SH_DICT,ERROR_exit(1),e_selfref,nv_name(np));
            /* bind to earlier scope, or add to global scope */
            if(!(hp=dtvnext(hp)) || (nq=nv_search((char*)np,hp,NV_ADD|HASH_BUCKET))==np)
                  errormsg(SH_DICT,ERROR_exit(1),e_selfref,nv_name(np));
      }
      if(ep)
      {
            /* cause subscript evaluation and return result */
#if 0
            nv_endsubscript(nq,ep,NV_ADD);
#endif
            ep = nv_getsub(nq);
      }
      nv_unset(np);
      np->nvalue.np = nq;
      if(ep)
            np->nvenv = strdup(ep);
      np->nvfun = (Namfun_t*)sh.last_table;
      nv_onattr(np,NV_REF|NV_NOFREE);
}

/*
 * get the scope corresponding to <index>
 * whence uses the same values as lseeek()
 */
Shscope_t *sh_getscope(int index, int whence)
{
      register struct sh_scoped *sp, *topmost;
      if(whence==SEEK_CUR)
            sp = &sh.st;
      else
      {
            if ((struct sh_scoped*)sh.topscope != sh.st.self)
                  topmost = (struct sh_scoped*)sh.topscope;
            else
                  topmost = &(sh.st);
            sp = topmost;
            if(whence==SEEK_SET)
            {
                  int n =0;
                  while(sp = sp->prevst)
                        n++;
                  index = n - index;
                  sp = topmost;
            }
      }
      if(index < 0)
            return((Shscope_t*)0);
      while(index-- && (sp = sp->prevst));
      return((Shscope_t*)sp);
}

/*
 * make <scoped> the top scope and return previous scope
 */
Shscope_t *sh_setscope(Shscope_t *scope)
{
      Shscope_t *old = (Shscope_t*)sh.st.self;
      *sh.st.self = sh.st;
      sh.st = *((struct sh_scoped*)scope);
      sh.var_tree = scope->var_tree;
      return(old);
}

void nv_unscope(void)
{
      register Dt_t *root = sh.var_tree;
      register Dt_t *dp = dtview(root,(Dt_t*)0);
      table_unset(root,NV_RDONLY|NV_NOSCOPE,dp);
      sh.var_tree=dp;
      dtclose(root);
}

/*
 * The inverse of creating a reference node
 */
void nv_unref(register Namval_t *np)
{
      Namval_t *nq = nv_refnode(np);
      if(!nv_isref(np))
            return;
      nv_offattr(np,NV_NOFREE|NV_REF);
      np->nvalue.cp = strdup(nv_name(nq=nv_refnode(np)));
      np->nvfun = 0;
#if SHOPT_OPTIMIZE
      {
            Namfun_t *fp;
            for(fp=nq->nvfun; fp; fp = fp->next)
            {
                  if(fp->disc== &optimize_disc)
                  {
                        optimize_clear(nq,fp);
                        return;
                  }
            }
      }
#endif
}

/*
 * These following are for binary compatibility with the old hash library
 * They will be removed someday
 */

#if defined(__IMPORT__) && defined(__EXPORT__)
#   define extern __EXPORT__
#endif

#undef      hashscope

extern Dt_t *hashscope(Dt_t *root)
{
      return(dtvnext(root));
}

#undef      hashfree

extern Dt_t *hashfree(Dt_t *root)
{
      Dt_t *dp = dtvnext(root);
      dtclose(root);
      return(dp);
}

#undef      hashname

extern char *hashname(void *obj)
{
      Namval_t *np = (Namval_t*)obj;
      return(np->nvname);
}

#undef      hashlook

extern void *hashlook(Dt_t *root, const char *name, int mode,int size)
{
      NOT_USED(size);
      return((void*)nv_search(name,root,mode));
}

char *nv_name(register Namval_t *np)
{
      register int len;
      register Namval_t *table;
      register Namfun_t *fp;
      char *curbuf, *cp;
      int inbuff;
      if(is_abuiltin(np) || is_afunction(np))
            return(np->nvname);
      if(nv_istable(np))
#if 1
            sh.last_table = nv_parent(np);
#else
            sh.last_table = nv_create(np,0, NV_LAST,(Namfun_t*)0);
#endif
      else if(!nv_isref(np))
      {
            for(fp= np->nvfun ; fp; fp=fp->next)
            if(fp->disc && fp->disc->namef)
            {
                  if(np==sh.last_table)
                        sh.last_table = 0;
                  return((*fp->disc->namef)(np,fp));
            }
      }
      if(!(table=sh.last_table) || *np->nvname=='.' || table==sh.namespace || np==table)
            return(np->nvname);
      cp = nv_name(table);
      inbuff = (cp==getbuf(0));
      len = strlen(cp) + strlen(np->nvname) + 2;
      curbuf = getbuf(len);
      if(inbuff)
            cp = curbuf;
      sfsprintf(curbuf,len,"%s.%s\0",cp,np->nvname);
      return(curbuf);
}

Namval_t *nv_lastdict(void)
{
      return(sh.last_table);
}

#undef nv_context
/*
 * returns the data context for a builtin
 */
void *nv_context(Namval_t *np)
{
      return((void*)np->nvfun);
}

#define DISABLE /* proto workaround */

int nv_isnull DISABLE (register Namval_t *np)
{
      return(nv_isnull(np));
}

#undef nv_setsize
int nv_setsize(register Namval_t *np, int size)
{
      int oldsize = nv_size(np);
      if(size>=0)
            np->nvsize = size;
      return(oldsize);
}

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