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symbol.c

/*
 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
 * Released under the terms of the GNU GPL v2.0.
 */

#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <regex.h>
#include <sys/utsname.h>

#define LKC_DIRECT_LINK
#include "lkc.h"

struct symbol symbol_yes = {
      .name = "y",
      .curr = { "y", yes },
      .flags = SYMBOL_CONST|SYMBOL_VALID,
}, symbol_mod = {
      .name = "m",
      .curr = { "m", mod },
      .flags = SYMBOL_CONST|SYMBOL_VALID,
}, symbol_no = {
      .name = "n",
      .curr = { "n", no },
      .flags = SYMBOL_CONST|SYMBOL_VALID,
}, symbol_empty = {
      .name = "",
      .curr = { "", no },
      .flags = SYMBOL_VALID,
};

struct symbol *sym_defconfig_list;
struct symbol *modules_sym;
tristate modules_val;

struct expr *sym_env_list;

static void sym_add_default(struct symbol *sym, const char *def)
{
      struct property *prop = prop_alloc(P_DEFAULT, sym);

      prop->expr = expr_alloc_symbol(sym_lookup(def, SYMBOL_CONST));
}

void sym_init(void)
{
      struct symbol *sym;
      struct utsname uts;
      static bool inited = false;

      if (inited)
            return;
      inited = true;

      uname(&uts);

      sym = sym_lookup("UNAME_RELEASE", 0);
      sym->type = S_STRING;
      sym->flags |= SYMBOL_AUTO;
      sym_add_default(sym, uts.release);
}

enum symbol_type sym_get_type(struct symbol *sym)
{
      enum symbol_type type = sym->type;

      if (type == S_TRISTATE) {
            if (sym_is_choice_value(sym) && sym->visible == yes)
                  type = S_BOOLEAN;
            else if (modules_val == no)
                  type = S_BOOLEAN;
      }
      return type;
}

const char *sym_type_name(enum symbol_type type)
{
      switch (type) {
      case S_BOOLEAN:
            return "boolean";
      case S_TRISTATE:
            return "tristate";
      case S_INT:
            return "integer";
      case S_HEX:
            return "hex";
      case S_STRING:
            return "string";
      case S_UNKNOWN:
            return "unknown";
      case S_OTHER:
            break;
      }
      return "???";
}

struct property *sym_get_choice_prop(struct symbol *sym)
{
      struct property *prop;

      for_all_choices(sym, prop)
            return prop;
      return NULL;
}

struct property *sym_get_env_prop(struct symbol *sym)
{
      struct property *prop;

      for_all_properties(sym, prop, P_ENV)
            return prop;
      return NULL;
}

struct property *sym_get_default_prop(struct symbol *sym)
{
      struct property *prop;

      for_all_defaults(sym, prop) {
            prop->visible.tri = expr_calc_value(prop->visible.expr);
            if (prop->visible.tri != no)
                  return prop;
      }
      return NULL;
}

static struct property *sym_get_range_prop(struct symbol *sym)
{
      struct property *prop;

      for_all_properties(sym, prop, P_RANGE) {
            prop->visible.tri = expr_calc_value(prop->visible.expr);
            if (prop->visible.tri != no)
                  return prop;
      }
      return NULL;
}

static int sym_get_range_val(struct symbol *sym, int base)
{
      sym_calc_value(sym);
      switch (sym->type) {
      case S_INT:
            base = 10;
            break;
      case S_HEX:
            base = 16;
            break;
      default:
            break;
      }
      return strtol(sym->curr.val, NULL, base);
}

static void sym_validate_range(struct symbol *sym)
{
      struct property *prop;
      int base, val, val2;
      char str[64];

      switch (sym->type) {
      case S_INT:
            base = 10;
            break;
      case S_HEX:
            base = 16;
            break;
      default:
            return;
      }
      prop = sym_get_range_prop(sym);
      if (!prop)
            return;
      val = strtol(sym->curr.val, NULL, base);
      val2 = sym_get_range_val(prop->expr->left.sym, base);
      if (val >= val2) {
            val2 = sym_get_range_val(prop->expr->right.sym, base);
            if (val <= val2)
                  return;
      }
      if (sym->type == S_INT)
            sprintf(str, "%d", val2);
      else
            sprintf(str, "0x%x", val2);
      sym->curr.val = strdup(str);
}

static void sym_calc_visibility(struct symbol *sym)
{
      struct property *prop;
      tristate tri;

      /* any prompt visible? */
      tri = no;
      for_all_prompts(sym, prop) {
            prop->visible.tri = expr_calc_value(prop->visible.expr);
            tri = EXPR_OR(tri, prop->visible.tri);
      }
      if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))
            tri = yes;
      if (sym->visible != tri) {
            sym->visible = tri;
            sym_set_changed(sym);
      }
      if (sym_is_choice_value(sym))
            return;
      tri = no;
      if (sym->rev_dep.expr)
            tri = expr_calc_value(sym->rev_dep.expr);
      if (tri == mod && sym_get_type(sym) == S_BOOLEAN)
            tri = yes;
      if (sym->rev_dep.tri != tri) {
            sym->rev_dep.tri = tri;
            sym_set_changed(sym);
      }
}

static struct symbol *sym_calc_choice(struct symbol *sym)
{
      struct symbol *def_sym;
      struct property *prop;
      struct expr *e;

      /* is the user choice visible? */
      def_sym = sym->def[S_DEF_USER].val;
      if (def_sym) {
            sym_calc_visibility(def_sym);
            if (def_sym->visible != no)
                  return def_sym;
      }

      /* any of the defaults visible? */
      for_all_defaults(sym, prop) {
            prop->visible.tri = expr_calc_value(prop->visible.expr);
            if (prop->visible.tri == no)
                  continue;
            def_sym = prop_get_symbol(prop);
            sym_calc_visibility(def_sym);
            if (def_sym->visible != no)
                  return def_sym;
      }

      /* just get the first visible value */
      prop = sym_get_choice_prop(sym);
      expr_list_for_each_sym(prop->expr, e, def_sym) {
            sym_calc_visibility(def_sym);
            if (def_sym->visible != no)
                  return def_sym;
      }

      /* no choice? reset tristate value */
      sym->curr.tri = no;
      return NULL;
}

void sym_calc_value(struct symbol *sym)
{
      struct symbol_value newval, oldval;
      struct property *prop;
      struct expr *e;

      if (!sym)
            return;

      if (sym->flags & SYMBOL_VALID)
            return;
      sym->flags |= SYMBOL_VALID;

      oldval = sym->curr;

      switch (sym->type) {
      case S_INT:
      case S_HEX:
      case S_STRING:
            newval = symbol_empty.curr;
            break;
      case S_BOOLEAN:
      case S_TRISTATE:
            newval = symbol_no.curr;
            break;
      default:
            sym->curr.val = sym->name;
            sym->curr.tri = no;
            return;
      }
      if (!sym_is_choice_value(sym))
            sym->flags &= ~SYMBOL_WRITE;

      sym_calc_visibility(sym);

      /* set default if recursively called */
      sym->curr = newval;

      switch (sym_get_type(sym)) {
      case S_BOOLEAN:
      case S_TRISTATE:
            if (sym_is_choice_value(sym) && sym->visible == yes) {
                  prop = sym_get_choice_prop(sym);
                  newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;
            } else {
                  if (sym->visible != no) {
                        /* if the symbol is visible use the user value
                         * if available, otherwise try the default value
                         */
                        sym->flags |= SYMBOL_WRITE;
                        if (sym_has_value(sym)) {
                              newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,
                                                sym->visible);
                              goto calc_newval;
                        }
                  }
                  if (sym->rev_dep.tri != no)
                        sym->flags |= SYMBOL_WRITE;
                  if (!sym_is_choice(sym)) {
                        prop = sym_get_default_prop(sym);
                        if (prop) {
                              sym->flags |= SYMBOL_WRITE;
                              newval.tri = EXPR_AND(expr_calc_value(prop->expr),
                                                prop->visible.tri);
                        }
                  }
            calc_newval:
                  newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
            }
            if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)
                  newval.tri = yes;
            break;
      case S_STRING:
      case S_HEX:
      case S_INT:
            if (sym->visible != no) {
                  sym->flags |= SYMBOL_WRITE;
                  if (sym_has_value(sym)) {
                        newval.val = sym->def[S_DEF_USER].val;
                        break;
                  }
            }
            prop = sym_get_default_prop(sym);
            if (prop) {
                  struct symbol *ds = prop_get_symbol(prop);
                  if (ds) {
                        sym->flags |= SYMBOL_WRITE;
                        sym_calc_value(ds);
                        newval.val = ds->curr.val;
                  }
            }
            break;
      default:
            ;
      }

      sym->curr = newval;
      if (sym_is_choice(sym) && newval.tri == yes)
            sym->curr.val = sym_calc_choice(sym);
      sym_validate_range(sym);

      if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
            sym_set_changed(sym);
            if (modules_sym == sym) {
                  sym_set_all_changed();
                  modules_val = modules_sym->curr.tri;
            }
      }

      if (sym_is_choice(sym)) {
            struct symbol *choice_sym;
            int flags = sym->flags & (SYMBOL_CHANGED | SYMBOL_WRITE);

            prop = sym_get_choice_prop(sym);
            expr_list_for_each_sym(prop->expr, e, choice_sym) {
                  choice_sym->flags |= flags;
                  if (flags & SYMBOL_CHANGED)
                        sym_set_changed(choice_sym);
            }
      }

      if (sym->flags & SYMBOL_AUTO)
            sym->flags &= ~SYMBOL_WRITE;
}

void sym_clear_all_valid(void)
{
      struct symbol *sym;
      int i;

      for_all_symbols(i, sym)
            sym->flags &= ~SYMBOL_VALID;
      sym_add_change_count(1);
      if (modules_sym)
            sym_calc_value(modules_sym);
}

void sym_set_changed(struct symbol *sym)
{
      struct property *prop;

      sym->flags |= SYMBOL_CHANGED;
      for (prop = sym->prop; prop; prop = prop->next) {
            if (prop->menu)
                  prop->menu->flags |= MENU_CHANGED;
      }
}

void sym_set_all_changed(void)
{
      struct symbol *sym;
      int i;

      for_all_symbols(i, sym)
            sym_set_changed(sym);
}

bool sym_tristate_within_range(struct symbol *sym, tristate val)
{
      int type = sym_get_type(sym);

      if (sym->visible == no)
            return false;

      if (type != S_BOOLEAN && type != S_TRISTATE)
            return false;

      if (type == S_BOOLEAN && val == mod)
            return false;
      if (sym->visible <= sym->rev_dep.tri)
            return false;
      if (sym_is_choice_value(sym) && sym->visible == yes)
            return val == yes;
      return val >= sym->rev_dep.tri && val <= sym->visible;
}

bool sym_set_tristate_value(struct symbol *sym, tristate val)
{
      tristate oldval = sym_get_tristate_value(sym);

      if (oldval != val && !sym_tristate_within_range(sym, val))
            return false;

      if (!(sym->flags & SYMBOL_DEF_USER)) {
            sym->flags |= SYMBOL_DEF_USER;
            sym_set_changed(sym);
      }
      /*
       * setting a choice value also resets the new flag of the choice
       * symbol and all other choice values.
       */
      if (sym_is_choice_value(sym) && val == yes) {
            struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
            struct property *prop;
            struct expr *e;

            cs->def[S_DEF_USER].val = sym;
            cs->flags |= SYMBOL_DEF_USER;
            prop = sym_get_choice_prop(cs);
            for (e = prop->expr; e; e = e->left.expr) {
                  if (e->right.sym->visible != no)
                        e->right.sym->flags |= SYMBOL_DEF_USER;
            }
      }

      sym->def[S_DEF_USER].tri = val;
      if (oldval != val)
            sym_clear_all_valid();

      return true;
}

tristate sym_toggle_tristate_value(struct symbol *sym)
{
      tristate oldval, newval;

      oldval = newval = sym_get_tristate_value(sym);
      do {
            switch (newval) {
            case no:
                  newval = mod;
                  break;
            case mod:
                  newval = yes;
                  break;
            case yes:
                  newval = no;
                  break;
            }
            if (sym_set_tristate_value(sym, newval))
                  break;
      } while (oldval != newval);
      return newval;
}

bool sym_string_valid(struct symbol *sym, const char *str)
{
      signed char ch;

      switch (sym->type) {
      case S_STRING:
            return true;
      case S_INT:
            ch = *str++;
            if (ch == '-')
                  ch = *str++;
            if (!isdigit(ch))
                  return false;
            if (ch == '0' && *str != 0)
                  return false;
            while ((ch = *str++)) {
                  if (!isdigit(ch))
                        return false;
            }
            return true;
      case S_HEX:
            if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
                  str += 2;
            ch = *str++;
            do {
                  if (!isxdigit(ch))
                        return false;
            } while ((ch = *str++));
            return true;
      case S_BOOLEAN:
      case S_TRISTATE:
            switch (str[0]) {
            case 'y': case 'Y':
            case 'm': case 'M':
            case 'n': case 'N':
                  return true;
            }
            return false;
      default:
            return false;
      }
}

bool sym_string_within_range(struct symbol *sym, const char *str)
{
      struct property *prop;
      int val;

      switch (sym->type) {
      case S_STRING:
            return sym_string_valid(sym, str);
      case S_INT:
            if (!sym_string_valid(sym, str))
                  return false;
            prop = sym_get_range_prop(sym);
            if (!prop)
                  return true;
            val = strtol(str, NULL, 10);
            return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
                   val <= sym_get_range_val(prop->expr->right.sym, 10);
      case S_HEX:
            if (!sym_string_valid(sym, str))
                  return false;
            prop = sym_get_range_prop(sym);
            if (!prop)
                  return true;
            val = strtol(str, NULL, 16);
            return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
                   val <= sym_get_range_val(prop->expr->right.sym, 16);
      case S_BOOLEAN:
      case S_TRISTATE:
            switch (str[0]) {
            case 'y': case 'Y':
                  return sym_tristate_within_range(sym, yes);
            case 'm': case 'M':
                  return sym_tristate_within_range(sym, mod);
            case 'n': case 'N':
                  return sym_tristate_within_range(sym, no);
            }
            return false;
      default:
            return false;
      }
}

bool sym_set_string_value(struct symbol *sym, const char *newval)
{
      const char *oldval;
      char *val;
      int size;

      switch (sym->type) {
      case S_BOOLEAN:
      case S_TRISTATE:
            switch (newval[0]) {
            case 'y': case 'Y':
                  return sym_set_tristate_value(sym, yes);
            case 'm': case 'M':
                  return sym_set_tristate_value(sym, mod);
            case 'n': case 'N':
                  return sym_set_tristate_value(sym, no);
            }
            return false;
      default:
            ;
      }

      if (!sym_string_within_range(sym, newval))
            return false;

      if (!(sym->flags & SYMBOL_DEF_USER)) {
            sym->flags |= SYMBOL_DEF_USER;
            sym_set_changed(sym);
      }

      oldval = sym->def[S_DEF_USER].val;
      size = strlen(newval) + 1;
      if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {
            size += 2;
            sym->def[S_DEF_USER].val = val = malloc(size);
            *val++ = '0';
            *val++ = 'x';
      } else if (!oldval || strcmp(oldval, newval))
            sym->def[S_DEF_USER].val = val = malloc(size);
      else
            return true;

      strcpy(val, newval);
      free((void *)oldval);
      sym_clear_all_valid();

      return true;
}

const char *sym_get_string_value(struct symbol *sym)
{
      tristate val;

      switch (sym->type) {
      case S_BOOLEAN:
      case S_TRISTATE:
            val = sym_get_tristate_value(sym);
            switch (val) {
            case no:
                  return "n";
            case mod:
                  return "m";
            case yes:
                  return "y";
            }
            break;
      default:
            ;
      }
      return (const char *)sym->curr.val;
}

bool sym_is_changable(struct symbol *sym)
{
      return sym->visible > sym->rev_dep.tri;
}

struct symbol *sym_lookup(const char *name, int flags)
{
      struct symbol *symbol;
      const char *ptr;
      char *new_name;
      int hash = 0;

      if (name) {
            if (name[0] && !name[1]) {
                  switch (name[0]) {
                  case 'y': return &symbol_yes;
                  case 'm': return &symbol_mod;
                  case 'n': return &symbol_no;
                  }
            }
            for (ptr = name; *ptr; ptr++)
                  hash += *ptr;
            hash &= 0xff;

            for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
                  if (!strcmp(symbol->name, name) &&
                      (flags ? symbol->flags & flags
                           : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))
                        return symbol;
            }
            new_name = strdup(name);
      } else {
            new_name = NULL;
            hash = 256;
      }

      symbol = malloc(sizeof(*symbol));
      memset(symbol, 0, sizeof(*symbol));
      symbol->name = new_name;
      symbol->type = S_UNKNOWN;
      symbol->flags |= flags;

      symbol->next = symbol_hash[hash];
      symbol_hash[hash] = symbol;

      return symbol;
}

struct symbol *sym_find(const char *name)
{
      struct symbol *symbol = NULL;
      const char *ptr;
      int hash = 0;

      if (!name)
            return NULL;

      if (name[0] && !name[1]) {
            switch (name[0]) {
            case 'y': return &symbol_yes;
            case 'm': return &symbol_mod;
            case 'n': return &symbol_no;
            }
      }
      for (ptr = name; *ptr; ptr++)
            hash += *ptr;
      hash &= 0xff;

      for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {
            if (!strcmp(symbol->name, name) &&
                !(symbol->flags & SYMBOL_CONST))
                        break;
      }

      return symbol;
}

struct symbol **sym_re_search(const char *pattern)
{
      struct symbol *sym, **sym_arr = NULL;
      int i, cnt, size;
      regex_t re;

      cnt = size = 0;
      /* Skip if empty */
      if (strlen(pattern) == 0)
            return NULL;
      if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
            return NULL;

      for_all_symbols(i, sym) {
            if (sym->flags & SYMBOL_CONST || !sym->name)
                  continue;
            if (regexec(&re, sym->name, 0, NULL, 0))
                  continue;
            if (cnt + 1 >= size) {
                  void *tmp = sym_arr;
                  size += 16;
                  sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
                  if (!sym_arr) {
                        free(tmp);
                        return NULL;
                  }
            }
            sym_arr[cnt++] = sym;
      }
      if (sym_arr)
            sym_arr[cnt] = NULL;
      regfree(&re);

      return sym_arr;
}


static struct symbol *sym_check_expr_deps(struct expr *e)
{
      struct symbol *sym;

      if (!e)
            return NULL;
      switch (e->type) {
      case E_OR:
      case E_AND:
            sym = sym_check_expr_deps(e->left.expr);
            if (sym)
                  return sym;
            return sym_check_expr_deps(e->right.expr);
      case E_NOT:
            return sym_check_expr_deps(e->left.expr);
      case E_EQUAL:
      case E_UNEQUAL:
            sym = sym_check_deps(e->left.sym);
            if (sym)
                  return sym;
            return sym_check_deps(e->right.sym);
      case E_SYMBOL:
            return sym_check_deps(e->left.sym);
      default:
            break;
      }
      printf("Oops! How to check %d?\n", e->type);
      return NULL;
}

/* return NULL when dependencies are OK */
static struct symbol *sym_check_sym_deps(struct symbol *sym)
{
      struct symbol *sym2;
      struct property *prop;

      sym2 = sym_check_expr_deps(sym->rev_dep.expr);
      if (sym2)
            return sym2;

      for (prop = sym->prop; prop; prop = prop->next) {
            if (prop->type == P_CHOICE || prop->type == P_SELECT)
                  continue;
            sym2 = sym_check_expr_deps(prop->visible.expr);
            if (sym2)
                  break;
            if (prop->type != P_DEFAULT || sym_is_choice(sym))
                  continue;
            sym2 = sym_check_expr_deps(prop->expr);
            if (sym2)
                  break;
      }

      return sym2;
}

static struct symbol *sym_check_choice_deps(struct symbol *choice)
{
      struct symbol *sym, *sym2;
      struct property *prop;
      struct expr *e;

      prop = sym_get_choice_prop(choice);
      expr_list_for_each_sym(prop->expr, e, sym)
            sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);

      choice->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
      sym2 = sym_check_sym_deps(choice);
      choice->flags &= ~SYMBOL_CHECK;
      if (sym2)
            goto out;

      expr_list_for_each_sym(prop->expr, e, sym) {
            sym2 = sym_check_sym_deps(sym);
            if (sym2) {
                  fprintf(stderr, " -> %s", sym->name);
                  break;
            }
      }
out:
      expr_list_for_each_sym(prop->expr, e, sym)
            sym->flags &= ~SYMBOL_CHECK;

      if (sym2 && sym_is_choice_value(sym2) &&
          prop_get_symbol(sym_get_choice_prop(sym2)) == choice)
            sym2 = choice;

      return sym2;
}

struct symbol *sym_check_deps(struct symbol *sym)
{
      struct symbol *sym2;
      struct property *prop;

      if (sym->flags & SYMBOL_CHECK) {
            fprintf(stderr, "%s:%d:error: found recursive dependency: %s",
                    sym->prop->file->name, sym->prop->lineno,
                  sym->name ? sym->name : "<choice>");
            return sym;
      }
      if (sym->flags & SYMBOL_CHECKED)
            return NULL;

      if (sym_is_choice_value(sym)) {
            /* for choice groups start the check with main choice symbol */
            prop = sym_get_choice_prop(sym);
            sym2 = sym_check_deps(prop_get_symbol(prop));
      } else if (sym_is_choice(sym)) {
            sym2 = sym_check_choice_deps(sym);
      } else {
            sym->flags |= (SYMBOL_CHECK | SYMBOL_CHECKED);
            sym2 = sym_check_sym_deps(sym);
            sym->flags &= ~SYMBOL_CHECK;
      }

      if (sym2) {
            fprintf(stderr, " -> %s", sym->name ? sym->name : "<choice>");
            if (sym2 == sym) {
                  fprintf(stderr, "\n");
                  zconfnerrs++;
                  sym2 = NULL;
            }
      }

      return sym2;
}

struct property *prop_alloc(enum prop_type type, struct symbol *sym)
{
      struct property *prop;
      struct property **propp;

      prop = malloc(sizeof(*prop));
      memset(prop, 0, sizeof(*prop));
      prop->type = type;
      prop->sym = sym;
      prop->file = current_file;
      prop->lineno = zconf_lineno();

      /* append property to the prop list of symbol */
      if (sym) {
            for (propp = &sym->prop; *propp; propp = &(*propp)->next)
                  ;
            *propp = prop;
      }

      return prop;
}

struct symbol *prop_get_symbol(struct property *prop)
{
      if (prop->expr && (prop->expr->type == E_SYMBOL ||
                     prop->expr->type == E_LIST))
            return prop->expr->left.sym;
      return NULL;
}

const char *prop_get_type_name(enum prop_type type)
{
      switch (type) {
      case P_PROMPT:
            return "prompt";
      case P_ENV:
            return "env";
      case P_COMMENT:
            return "comment";
      case P_MENU:
            return "menu";
      case P_DEFAULT:
            return "default";
      case P_CHOICE:
            return "choice";
      case P_SELECT:
            return "select";
      case P_RANGE:
            return "range";
      case P_UNKNOWN:
            break;
      }
      return "unknown";
}

static void prop_add_env(const char *env)
{
      struct symbol *sym, *sym2;
      struct property *prop;
      char *p;

      sym = current_entry->sym;
      sym->flags |= SYMBOL_AUTO;
      for_all_properties(sym, prop, P_ENV) {
            sym2 = prop_get_symbol(prop);
            if (strcmp(sym2->name, env))
                  menu_warn(current_entry, "redefining environment symbol from %s",
                          sym2->name);
            return;
      }

      prop = prop_alloc(P_ENV, sym);
      prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));

      sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
      sym_env_list->right.sym = sym;

      p = getenv(env);
      if (p)
            sym_add_default(sym, p);
      else
            menu_warn(current_entry, "environment variable %s undefined", env);
}

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