usr/src/lib/libmail/common/substr.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) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include <sys/types.h>
  33 #include "libmail.h"
  34
  35 /*
  36  *      This routine looks for string2 in string1.
  37  *      If found, it returns the position string2 is found at,
  38  *      otherwise it returns a -1.
  39  */
  40 int
  41 substr(char *string1, char *string2)
  42 {
  43         int i, j, len1, len2;
  44
  45         /* the size of the substring will always fit into an int */
  46         /*LINTED*/
  47         len1 = (int)strlen(string1);
  48         /*LINTED*/
  49         len2 = (int)strlen(string2);
  50         for (i = 0; i < len1 - len2 + 1; i++) {
  51                 for (j = 0; j < len2 && string1[i+j] == string2[j]; j++)
  52                         continue;
  53                 if (j == len2)
  54                         return (i);
  55         }
  56         return (-1);
  57 }