last_char_is.c

/*
 * busybox library eXtended function
 *
 * Copyright (C) 2001 Larry Doolittle, <ldoolitt@recycle.lbl.gov>
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include <string.h>

/* Find out if the last character of a string matches the one given Don't
 * underrun the buffer if the string length is 0.  Also avoids a possible
 * space-hogging inline of strlen() per usage.
 */
char *
last_char_is (const char *s, int c)
{
  char *sret;
  if (!s)
    return NULL;
  sret = (char *) s + strlen (s) - 1;
  if (sret >= s && *sret == c)
    {
      return sret;
    }
  else
    {
      return NULL;
    }
}