usr/src/cmd/lp/lib/printers/getpentry.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 /*
  23  * Copyright 1997 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
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32 /* EMACS_MODES: !fill, lnumb, !overwrite, !nodelete, !picture */
  33
  34 #include "stdio.h"
  35 #include "string.h"
  36 #include "errno.h"
  37 #include "sys/types.h"
  38 #include "stdlib.h"
  39
  40 #include "lp.h"
  41 #include "printers.h"
  42
  43 extern struct {
  44         char                    *v;
  45         short                   len,
  46                                 okremote;
  47 }                       prtrheadings[];
  48
  49 /*
  50  * getpentry() - EXTRACT ONE PRINTER ENTRY FROM DISK FILE
  51  */
  52
  53 char *
  54 getpentry(char *name, int want_fld)
  55 {
  56         static long             lastdir         = -1;
  57         char                    buf[BUFSIZ];
  58         int                     fld;
  59         int fd;
  60         register char *         p;
  61         register char *         path;
  62         int                     isNameAll;
  63         char * option_entry = NULL;
  64
  65
  66
  67         if (!name || !*name) {
  68                 errno = EINVAL;
  69                 return (0);
  70         }
  71
  72         /*
  73          * Getting ``all''? If so, jump into the directory
  74          * wherever we left off.
  75          */
  76         isNameAll = STREQU(NAME_ALL, name);
  77         for (; ; ) {
  78                 /*
  79                  * fix for bug 1117241
  80                  * occasionally when a printer is removed, a printer directory
  81                  * is left behind, but the CONFIGFILE is removed.  In this
  82                  * case this directory terminates the search for additional
  83                  * printers as we have been returning 0 in this case.
  84                  * Now, we loop back and try the next directory until
  85                  * we have no more directories or we find a directory with
  86                  * a CONFIGFILE
  87                  */
  88                 if (isNameAll) {
  89                         if (!(name = next_dir(Lp_A_Printers, &lastdir)))
  90                                 return (0);
  91                 } else
  92                         lastdir = -1;
  93
  94                 /*
  95                  * Get the printer configuration information.
  96                  */
  97
  98                 path = getprinterfile(name, CONFIGFILE);
  99                 if (!path) {
 100                         if (isNameAll)
 101                                 Free(name);
 102                         return (0);
 103                 }
 104
 105                 if ((fd = open_locked(path, "r", 0)) < 0) {
 106                         Free(path);
 107
 108                         /*
 109                          * go around to loop again for
 110                          * NAME_ALL case
 111                          */
 112
 113                         if (!isNameAll) /* fix for bug 1117241 */
 114                                 return (0);
 115                         else
 116                                 Free(name);
 117                 }
 118                 else
 119                         break;
 120         }
 121         Free(path);
 122
 123         /*
 124          * Read the file.
 125          */
 126         errno = 0;
 127         while (fdgets(buf, BUFSIZ, fd) != NULL) {
 128
 129                 buf[strlen(buf) - 1] = 0;
 130
 131                 for (fld = 0; fld < PR_MAX; fld++)
 132                         if (prtrheadings[fld].v &&
 133                                 prtrheadings[fld].len &&
 134                                 STRNEQU(
 135                                         buf,
 136                                         prtrheadings[fld].v,
 137                                         prtrheadings[fld].len)) {
 138
 139                                 p = buf + prtrheadings[fld].len;
 140                                 while (*p && *p == ' ')
 141                                         p++;
 142                                 break;
 143                         }
 144
 145                 /*
 146                  * To allow future extensions to not impact applications
 147                  * using old versions of this routine, ignore strange
 148                  * fields.
 149                  */
 150                 if (fld >= PR_MAX)
 151                         continue;
 152
 153                 if (fld == want_fld) {
 154                         if ((option_entry = strdup(p)) == NULL) {
 155                                 return (0);
 156                         }
 157                 }
 158
 159
 160         }
 161         if (errno != 0) {
 162                 int save_errno = errno;
 163                 close(fd);
 164                 errno = save_errno;
 165                 return (0);
 166         }
 167         close(fd);
 168
 169         return (option_entry);
 170 }