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gen_tables.h

/* gen_tables.h -- Declarations used for lookup tables.
 * Copyright 2008 Red Hat Inc., Durham, North Carolina.
 * All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Authors:
 *      Miloslav Trma─Ź <mitr@redhat.com>
 */
#ifndef GEN_TABLES_H__
#define GEN_TABLES_H__

#include <stddef.h>
#include <stdint.h>

/* Assumes ASCII; verified in gen_tables.c. */
#define GT_ISUPPER(X) ((X) >= 'A' && (X) <= 'Z')
#define GT_ISLOWER(X) ((X) >= 'a' && (X) <= 'z')

inline static int s2i__(const char *strings, const unsigned *s_table,
                  const int *i_table, size_t n, const char *s, int *value)
{
      ssize_t left, right;

      left = 0;
      right = n - 1;
      while (left <= right) { /* invariant: left <= x <= right */
            size_t mid;
            int r;

            mid = (left + right) / 2;
            /* FIXME? avoid recomparing a common prefix */
            r = strcmp(s, strings + s_table[mid]);
            if (r == 0) {
                  *value = i_table[mid];
                  return 1;
            }
            if (r < 0)
                  right = mid - 1;
            else
                  left = mid + 1;
      }
      return 0;
}

inline static const char *i2s_direct__(const char *strings,
                               const unsigned *table, int min, int max,
                               int v)
{
      unsigned off;

      if (v < min || v > max)
            return NULL;
      off = table[v - min];
      if (off != -1u)
            return strings + off;
      return NULL;
}

inline static const char *i2s_bsearch__(const char *strings,
                              const int *i_table,
                              const unsigned *s_table, size_t n,
                              int v)
{
      ssize_t left, right;

      left = 0;
      right = n - 1;
      while (left <= right) { /* invariant: left <= x <= right */
            size_t mid;
            int mid_val;

            mid = (left + right) / 2;
            mid_val = i_table[mid];
            if (v == mid_val)
                  return strings + s_table[mid];
            if (v < mid_val)
                  right = mid - 1;
            else
                  left = mid + 1;
      }
      return NULL;
}

00097 struct transtab {
      int value;
      unsigned offset;
};

#endif

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