libbb/last_char_is.c

   1 /*
   2  * busybox library eXtended function
   3  *
   4  * Copyright (C) 2001 Larry Doolittle, <ldoolitt@recycle.lbl.gov>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  *
  20  */
  21
  22 #include <string.h>
  23 #include "libbb.h"
  24
  25 /* Find out if the last character of a string matches the one given Don't
  26  * underrun the buffer if the string length is 0.  Also avoids a possible
  27  * space-hogging inline of strlen() per usage.
  28  */
  29 char * last_char_is(const char *s, int c)
  30 {
  31         char *sret;
  32         if (!s)
  33             return NULL;
  34         sret  = (char *)s+strlen(s)-1;
  35         if (sret>=s && *sret == c) {
  36                 return sret;
  37         } else {
  38                 return NULL;
  39         }
  40 }