patch mdb_var_alloc

*** 392,406 ****
   * it will be saved in the mdb_tab_cookie_t.
   */
  void
  mdb_tab_insert(mdb_tab_cookie_t *mcp, const char *name)
  {
!         size_t len, matches, index;
!         uint_t flags;
          mdb_var_t *v;
          char *n;
-         const char *nvn;
  
          /*
           * If we have a match set, then we want to verify that we actually match
           * it.
           */
--- 392,404 ----
   * it will be saved in the mdb_tab_cookie_t.
   */
  void
  mdb_tab_insert(mdb_tab_cookie_t *mcp, const char *name)
  {
!         size_t matches, index;
          mdb_var_t *v;
          char *n;
  
          /*
           * If we have a match set, then we want to verify that we actually match
           * it.
           */
*** 410,447 ****
  
          v = mdb_nv_lookup(&mcp->mtc_nv, name);
          if (v != NULL)
                  return;
  
!         /*
!          * Names that we get passed in may be longer than MDB_NV_NAMELEN which
!          * is currently 31 including the null terminator. If that is the case,
!          * then we're going to take care of allocating a string and holding it
!          * for our caller. Note that we don't need to free it, because we're
!          * allocating this with UM_GC.
!          */
!         flags = 0;
!         len = strlen(name);
!         if (len > MDB_NV_NAMELEN - 1) {
!                 n = mdb_alloc(len + 1, UM_SLEEP | UM_GC);
!                 (void) strcpy(n, name);
!                 nvn = n;
!                 flags |= MDB_NV_EXTNAME;
!         } else {
!                 nvn = name;
!         }
!         flags |= MDB_NV_RDONLY;
! 
!         (void) mdb_nv_insert(&mcp->mtc_nv, nvn, NULL, 0, flags);
  
          matches = mdb_tab_size(mcp);
          if (matches == 1) {
!                 (void) strlcpy(mcp->mtc_match, nvn, MDB_SYM_NAMLEN);
          } else {
                  index = 0;
                  while (mcp->mtc_match[index] &&
!                     mcp->mtc_match[index] == nvn[index])
                          index++;
  
                  mcp->mtc_match[index] = '\0';
          }
  }
--- 408,426 ----
  
          v = mdb_nv_lookup(&mcp->mtc_nv, name);
          if (v != NULL)
                  return;
  
!         (void) mdb_nv_insert(&mcp->mtc_nv, name, NULL, 0, MDB_NV_RDONLY);
  
          matches = mdb_tab_size(mcp);
          if (matches == 1) {
!                 (void) strlcpy(mcp->mtc_match, name, MDB_SYM_NAMLEN);
          } else {
                  index = 0;
                  while (mcp->mtc_match[index] &&
!                     mcp->mtc_match[index] == name[index])
                          index++;
  
                  mcp->mtc_match[index] = '\0';
          }
  }