/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file

 */

/* Comparator 'i;ascii-casemap':

 *

 */

#include "lib.h"

#include "sieve-common.h"

#include "sieve-comparators.h"

#include <string.h>

#include <stdio.h>

#include <ctype.h>

/*

 * Forward declarations

 */

static int

cmp_i_ascii_casemap_compare(const struct sieve_comparator *cmp,

          const char *val1, size_t val1_size,

          const char *val2, size_t val2_size);

static bool

cmp_i_ascii_casemap_char_match(const struct sieve_comparator *cmp,

             const char **val1, const char *val1_end,

             const char **val2, const char *val2_end);

/*

 * Comparator object

 */

const struct sieve_comparator_def i_ascii_casemap_comparator = {

  SIEVE_OBJECT("i;ascii-casemap", &comparator_operand,

         SIEVE_COMPARATOR_I_ASCII_CASEMAP),

  .flags =

    SIEVE_COMPARATOR_FLAG_ORDERING |

    SIEVE_COMPARATOR_FLAG_EQUALITY |

    SIEVE_COMPARATOR_FLAG_SUBSTRING_MATCH |

    SIEVE_COMPARATOR_FLAG_PREFIX_MATCH,

  .compare = cmp_i_ascii_casemap_compare,

  .char_match = cmp_i_ascii_casemap_char_match,

  .char_skip = sieve_comparator_octet_skip

};

/*

 * Comparator implementation

 */

static int

cmp_i_ascii_casemap_compare(const struct sieve_comparator *cmp ATTR_UNUSED,

          const char *val1, size_t val1_size,

          const char *val2, size_t val2_size)

{

  size_t size = I_MIN(val1_size, val2_size);

  int ret = strncasecmp(val1, val2, size);

  return (ret != 0 ? ret : (int)val1_size - (int)val2_size);

}

static bool

cmp_i_ascii_casemap_char_match(const struct sieve_comparator *cmp ATTR_UNUSED,

             const char **val, const char *val_end,

             const char **key, const char *key_end)

{

  const char *val_begin = *val;

  const char *key_begin = *key;

  while (*val < val_end && *key < key_end &&

         i_tolower(**val) == i_tolower(**key)) {

    (*val)++;

    (*key)++;

  }

  if (*key < key_end) {

    /* Reset */

    *val = val_begin;

    *key = key_begin;

    return FALSE;

  }

  return TRUE;

}