compiler/stdc/strrev.c

   1 /*
   2     Copyright © 1995-2012, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     SAS/C function strrev().
   6 */
   7
   8 /*****************************************************************************
   9
  10     NAME */
  11 #include <string.h>
  12
  13         char * strrev (
  14
  15 /*  SYNOPSIS */
  16         char       * s)
  17
  18 /*  FUNCTION
  19         Reverse a string (rotate it about its midpoint)
  20
  21     INPUTS
  22         s - The string to be reversed
  23
  24     RESULT
  25         The original string pointer
  26
  27     NOTES
  28         SAS C specific
  29
  30     EXAMPLE
  31         char buffer[64];
  32
  33         strcpy (buffer, "Hello);
  34         strrev(buffer);
  35
  36         // buffer now contains "olleH"
  37
  38
  39     BUGS
  40
  41     SEE ALSO
  42
  43     INTERNALS
  44
  45 ******************************************************************************/
  46 {
  47     char *start, *end, c1, c2;
  48
  49     start = end = s;
  50
  51     while(*end) end++;
  52     end--;
  53
  54     while(end > start)
  55     {
  56         c1 = *start;
  57         c2 = *end;
  58
  59         *start++ = c2;
  60         *end--   = c1;
  61     }
  62
  63     return s;
  64
  65 } /* strrev */