string/strchr.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /* Copyright (c) 1992 NeXT Computer, Inc.  All rights reserved.
  26  *
  27  *      File:   libc/string/strchr.c
  28  *
  29  *      This file contains machine independent code for string index
  30  *
  31  * HISTORY
  32  * 24-Nov-92  Derek B Clegg (dclegg@next.com)
  33  *      Created.
  34  */
  35 #import <string.h>
  36
  37 /* This routine needs to be optimized. */
  38
  39 char *strchr(const char *s, int c)
  40 {
  41     const char ch = c;
  42
  43     for ( ; *s != ch; s++)
  44         if (*s == '\0')
  45             return 0;
  46     return (char *)s;
  47 }