/* Optimized string comparison.

   Copyright (C) 2001-2002, 2007, 2009-2019 Free Software Foundation, Inc.

   This program 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 program 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 program.  If not, see <https://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>.  */

#ifndef _GL_STREQ_H

#define _GL_STREQ_H

#include <string.h>

/* STREQ_OPT allows to optimize string comparison with a small literal string.

     STREQ_OPT (s, "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0)

   is semantically equivalent to

     strcmp (s, "EUC-KR") == 0

   just faster.  */

/* Help GCC to generate good code for string comparisons with

   immediate strings. */

#if defined (__GNUC__) && defined (__OPTIMIZE__)

static inline int

streq9 (const char *s1, const char *s2)

{

  return strcmp (s1 + 9, s2 + 9) == 0;

}

static inline int

streq8 (const char *s1, const char *s2, char s28)

{

  if (s1[8] == s28)

    {

      if (s28 == 0)

        return 1;

      else

        return streq9 (s1, s2);

    }

  else

    return 0;

}

static inline int

streq7 (const char *s1, const char *s2, char s27, char s28)

{

  if (s1[7] == s27)

    {

      if (s27 == 0)

        return 1;

      else

        return streq8 (s1, s2, s28);

    }

  else

    return 0;

}

static inline int

streq6 (const char *s1, const char *s2, char s26, char s27, char s28)

{

  if (s1[6] == s26)

    {

      if (s26 == 0)

        return 1;

      else

        return streq7 (s1, s2, s27, s28);

    }

  else

    return 0;

}

static inline int

streq5 (const char *s1, const char *s2, char s25, char s26, char s27, char s28)

{

  if (s1[5] == s25)

    {

      if (s25 == 0)

        return 1;

      else

        return streq6 (s1, s2, s26, s27, s28);

    }

  else

    return 0;

}

static inline int

streq4 (const char *s1, const char *s2, char s24, char s25, char s26, char s27, char s28)

{

  if (s1[4] == s24)

    {

      if (s24 == 0)

        return 1;

      else

        return streq5 (s1, s2, s25, s26, s27, s28);

    }

  else

    return 0;

}

static inline int

streq3 (const char *s1, const char *s2, char s23, char s24, char s25, char s26, char s27, char s28)

{

  if (s1[3] == s23)

    {

      if (s23 == 0)

        return 1;

      else

        return streq4 (s1, s2, s24, s25, s26, s27, s28);

    }

  else

    return 0;

}

static inline int

streq2 (const char *s1, const char *s2, char s22, char s23, char s24, char s25, char s26, char s27, char s28)

{

  if (s1[2] == s22)

    {

      if (s22 == 0)

        return 1;

      else

        return streq3 (s1, s2, s23, s24, s25, s26, s27, s28);

    }

  else

    return 0;

}

static inline int

streq1 (const char *s1, const char *s2, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28)

{

  if (s1[1] == s21)

    {

      if (s21 == 0)

        return 1;

      else

        return streq2 (s1, s2, s22, s23, s24, s25, s26, s27, s28);

    }

  else

    return 0;

}

static inline int

streq0 (const char *s1, const char *s2, char s20, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28)

{

  if (s1[0] == s20)

    {

      if (s20 == 0)

        return 1;

      else

        return streq1 (s1, s2, s21, s22, s23, s24, s25, s26, s27, s28);

    }

  else

    return 0;

}

#define STREQ_OPT(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \

  streq0 (s1, s2, s20, s21, s22, s23, s24, s25, s26, s27, s28)

#else

#define STREQ_OPT(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \

  (strcmp (s1, s2) == 0)

#endif

#endif /* _GL_STREQ_H */