usr/src/lib/libc/port/gen/strspn.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include "lint.h"
  33 #include <string.h>
  34 #include <sys/types.h>
  35
  36 /*
  37  * Return the number of characters in the maximum leading segment
  38  * of string which consists solely of characters from charset.
  39  */
  40 size_t
  41 strspn(const char *string, const char *charset)
  42 {
  43         const char *p, *q;
  44
  45         for (q = string; *q != '\0'; ++q) {
  46                 for (p = charset; *p != '\0' && *p != *q; ++p)
  47                         ;
  48                 if (*p == '\0')
  49                         break;
  50         }
  51         return (q - string);
  52 }