usr/src/cmd/mail/legal.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  23 /*        All Rights Reserved   */
  24
  25
  26 /*
  27  *      Copyright (c) 2001 by Sun Microsystems, Inc.
  28  *      All rights reserved.
  29  */
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32 /*
  33  *  NAME
  34  *      legal - check existence of file
  35  *
  36  *  SYNOPSIS
  37  *      int legal(char *file)
  38  *
  39  *  DESCRIPTION
  40  *      legal() checks to see if "file" is a writable file name.
  41  *
  42  *      Returns:
  43  *              0       -> file or directory exists, but is unwriteable
  44  *              1       -> file exists writeable
  45  *              2       -> file does not exist, but can be created
  46  */
  47
  48 #include "mail.h"
  49 int
  50 legal(file)
  51 register char *file;
  52 {
  53         register char *sp;
  54         char dfile[MAXFILENAME];
  55
  56         /*
  57          *      If file does not exist then try "." if file name has
  58          *      no "/". For file names that have a "/", try check
  59          *      for existence of previous directory.
  60          */
  61         if (access(file, A_EXIST) == A_OK) {
  62                 if (access(file, A_WRITE) == A_OK)
  63                         return (1);
  64                 else return (0);
  65         } else {
  66                 if ((sp = strrchr(file, '/')) == NULL) {
  67                         strcpy(dfile, ".");
  68                 } else if (sp == file) {
  69                         strcpy(dfile, "/");
  70                 } else {
  71                         if ((sp - file + 1) > MAXFILENAME)
  72                                 return (0);
  73                         strncpy(dfile, file, sp - file);
  74                         dfile[sp - file] = '\0';
  75                 }
  76                 if (access(dfile, A_WRITE) == CERROR)
  77                         return (0);
  78                 return (2);
  79         }
  80 }