usr/src/lib/libc/port/nsl/checkver.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 2006 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 "mt.h"
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <sys/types.h>
  37
  38 #define VSTR    "# VERSION="
  39
  40
  41 /*
  42  * check_version - check to make sure designated file is the correct version
  43  *              returns : 0 - version correct
  44  *                        1 - version incorrect
  45  *                        2 - could not open file
  46  *                        3 - corrupt file
  47  */
  48
  49
  50 int
  51 check_version(int ver, char *fname)
  52 {
  53         FILE *fp;               /* file pointer for sactab */
  54         char line[BUFSIZ];      /* temp buffer for input */
  55         char *p;                /* working pointer */
  56         int version;            /* version number from sactab */
  57
  58         if ((fp = fopen(fname, "rF")) == NULL)
  59                 return (2);
  60         p = line;
  61         while (fgets(p, BUFSIZ, fp)) {
  62                 if (strncmp(p, VSTR, strlen(VSTR)) == 0) {
  63                         p += strlen(VSTR);
  64                         if (*p)
  65                                 version = atoi(p);
  66                         else
  67                                 return (3);
  68                         (void) fclose(fp);
  69                         return ((version != ver) ? 1 : 0);
  70                 }
  71                 p = line;
  72         }
  73         return (3);
  74 }