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strrevcmp.c

/*
 * Copyright (c) 2001 Sendmail, Inc. and its suppliers.
 *    All rights reserved.
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the sendmail distribution.
 *
 */

#include <sm/gen.h>
SM_RCSID("@(#)$Id: strrevcmp.c,v 1.5 2001/09/11 04:04:49 gshapiro Exp $")

#include <sm/config.h>
#include <sm/string.h>
#include <string.h>

/* strcasecmp.c */
extern const unsigned char charmap[];

/*
**  SM_STRREVCASECMP -- compare two strings starting at the end (ignore case)
**
**    Parameters:
**          s1 -- first string.
**          s2 -- second string.
**
**    Returns:
**          strcasecmp(reverse(s1), reverse(s2))
*/

int
sm_strrevcasecmp(s1, s2)
      const char *s1, *s2;
{
      register int i1, i2;

      i1 = strlen(s1) - 1;
      i2 = strlen(s2) - 1;
      while (i1 >= 0 && i2 >= 0 &&
             charmap[(unsigned char) s1[i1]] ==
             charmap[(unsigned char) s2[i2]])
      {
            --i1;
            --i2;
      }
      if (i1 < 0)
      {
            if (i2 < 0)
                  return 0;
            else
                  return -1;
      }
      else
      {
            if (i2 < 0)
                  return 1;
            else
                  return (charmap[(unsigned char) s1[i1]] -
                        charmap[(unsigned char) s2[i2]]);
      }
}
/*
**  SM_STRREVCMP -- compare two strings starting at the end
**
**    Parameters:
**          s1 -- first string.
**          s2 -- second string.
**
**    Returns:
**          strcmp(reverse(s1), reverse(s2))
*/

int
sm_strrevcmp(s1, s2)
      const char *s1, *s2;
{
      register int i1, i2;

      i1 = strlen(s1) - 1;
      i2 = strlen(s2) - 1;
      while (i1 >= 0 && i2 >= 0 && s1[i1] == s2[i2])
      {
            --i1;
            --i2;
      }
      if (i1 < 0)
      {
            if (i2 < 0)
                  return 0;
            else
                  return -1;
      }
      else
      {
            if (i2 < 0)
                  return 1;
            else
                  return s1[i1] - s2[i2];
      }
}

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