/* 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 either:

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.
   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>.  */

#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
