compiler/clib/strchr.c

   1 /*
   2     Copyright © 1995-2012, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     C99 function strchr().
   6 */
   7
   8 #include <aros/macros.h>
   9 #include <stdio.h>
  10
  11 /*****************************************************************************
  12
  13     NAME */
  14 #include <string.h>
  15
  16         char * strchr (
  17
  18 /*  SYNOPSIS */
  19         const char * str,
  20         int          c)
  21
  22 /*  FUNCTION
  23         Searches for a character in a string.
  24
  25     INPUTS
  26         str - Search this string
  27         c - Look for this character
  28
  29     RESULT
  30         A pointer to the first occurence of c in str or NULL if c is not
  31         found in str.
  32
  33     NOTES
  34
  35     EXAMPLE
  36         char buffer[64];
  37
  38         strcpy (buffer, "Hello ");
  39
  40         // This returns a pointer to the first l in buffer.
  41         strchr (buffer, 'l');
  42
  43         // This returns NULL
  44         strchr (buffer, 'x');
  45
  46     BUGS
  47
  48     SEE ALSO
  49         strrchr()
  50
  51     INTERNALS
  52
  53 ******************************************************************************/
  54 {
  55     do
  56     {
  57         /* those casts are needed to compare chars > 127 */
  58         if ((unsigned char)*str == (unsigned char)c)
  59             return ((char *)str);
  60     } while (*(str++));
  61
  62     return NULL;
  63 } /* strchr */
  64
  65 AROS_MAKE_ALIAS(strchr, index);