newlib/libc/string/strrchr.c

   1 /*
   2 FUNCTION
   3         <<strrchr>>---reverse search for character in string
   4
   5 INDEX
   6         strrchr
   7
   8 SYNOPSIS
   9         #include <string.h>
  10         char * strrchr(const char *<[string]>, int <[c]>);
  11
  12 DESCRIPTION
  13         This function finds the last occurence of <[c]> (converted to
  14         a char) in the string pointed to by <[string]> (including the
  15         terminating null character).
  16
  17 RETURNS
  18         Returns a pointer to the located character, or a null pointer
  19         if <[c]> does not occur in <[string]>.
  20
  21 PORTABILITY
  22 <<strrchr>> is ANSI C.
  23
  24 <<strrchr>> requires no supporting OS subroutines.
  25
  26 QUICKREF
  27         strrchr ansi pure
  28 */
  29
  30 #include <string.h>
  31
  32 char *
  33 strrchr (const char *s,
  34         int i)
  35 {
  36   const char *last = NULL;
  37   char c = i;
  38
  39   if (c)
  40     {
  41       while ((s=strchr(s, c)))
  42         {
  43           last = s;
  44           s++;
  45         }
  46     }
  47   else
  48     {
  49       last = strchr(s, c);
  50     }
  51
  52   return (char *) last;
  53 }