/* Optimized case-insensitive string comparison in C locale.

   Copyright (C) 2001-2002, 2007, 2009-2018 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify it

   under the terms of the GNU General Public License as published

   by the Free Software Foundation; either version 3 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

   General Public License for more details.

   You should have received a copy of the GNU General Public License

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

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

#include "c-strcase.h"

#include "c-ctype.h"

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

     STRCASEEQ (s, "UTF-8", 'U','T','F','-','8',0,0,0,0)

   is semantically equivalent to

     c_strcasecmp (s, "UTF-8") == 0

   just faster.  */

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

   immediate strings. */

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

/* Case insensitive comparison of ASCII characters.  */

# if C_CTYPE_ASCII

#  define CASEEQ(other,upper) \

     (c_isupper (upper) ? ((other) & ~0x20) == (upper) : (other) == (upper))

# else

#  define CASEEQ(other,upper) \

     (c_toupper (other) == (upper))

# endif

static inline int

strcaseeq9 (const char *s1, const char *s2)

{

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

}

static inline int

strcaseeq8 (const char *s1, const char *s2, char s28)

{

  if (CASEEQ (s1[8], s28))

    {

      if (s28 == 0)

        return 1;

      else

        return strcaseeq9 (s1, s2);

    }

  else

    return 0;

}

static inline int

strcaseeq7 (const char *s1, const char *s2, char s27, char s28)

{

  if (CASEEQ (s1[7], s27))

    {

      if (s27 == 0)

        return 1;

      else

        return strcaseeq8 (s1, s2, s28);

    }

  else

    return 0;

}

static inline int

strcaseeq6 (const char *s1, const char *s2, char s26, char s27, char s28)

{

  if (CASEEQ (s1[6], s26))

    {

      if (s26 == 0)

        return 1;

      else

        return strcaseeq7 (s1, s2, s27, s28);

    }

  else

    return 0;

}

static inline int

strcaseeq5 (const char *s1, const char *s2, char s25, char s26, char s27, char s28)

{

  if (CASEEQ (s1[5], s25))

    {

      if (s25 == 0)

        return 1;

      else

        return strcaseeq6 (s1, s2, s26, s27, s28);

    }

  else

    return 0;

}

static inline int

strcaseeq4 (const char *s1, const char *s2, char s24, char s25, char s26, char s27, char s28)

{

  if (CASEEQ (s1[4], s24))

    {

      if (s24 == 0)

        return 1;

      else

        return strcaseeq5 (s1, s2, s25, s26, s27, s28);

    }

  else

    return 0;

}

static inline int

strcaseeq3 (const char *s1, const char *s2, char s23, char s24, char s25, char s26, char s27, char s28)

{

  if (CASEEQ (s1[3], s23))

    {

      if (s23 == 0)

        return 1;

      else

        return strcaseeq4 (s1, s2, s24, s25, s26, s27, s28);

    }

  else

    return 0;

}

static inline int

strcaseeq2 (const char *s1, const char *s2, char s22, char s23, char s24, char s25, char s26, char s27, char s28)

{

  if (CASEEQ (s1[2], s22))

    {

      if (s22 == 0)

        return 1;

      else

        return strcaseeq3 (s1, s2, s23, s24, s25, s26, s27, s28);

    }

  else

    return 0;

}

static inline int

strcaseeq1 (const char *s1, const char *s2, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28)

{

  if (CASEEQ (s1[1], s21))

    {

      if (s21 == 0)

        return 1;

      else

        return strcaseeq2 (s1, s2, s22, s23, s24, s25, s26, s27, s28);

    }

  else

    return 0;

}

static inline int

strcaseeq0 (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 (CASEEQ (s1[0], s20))

    {

      if (s20 == 0)

        return 1;

      else

        return strcaseeq1 (s1, s2, s21, s22, s23, s24, s25, s26, s27, s28);

    }

  else

    return 0;

}

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

  strcaseeq0 (s1, s2, s20, s21, s22, s23, s24, s25, s26, s27, s28)

#else

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

  (c_strcasecmp (s1, s2) == 0)

#endif