source3/printing/print_standard.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    printcap parsing
   4    Copyright (C) Karl Auer 1993-1998
   5
   6    Re-working by Martin Kiff, 1994
   7
   8    Re-written again by Andrew Tridgell
   9
  10    Modified for SVID support by Norm Jacobs, 1997
  11
  12    Modified for CUPS support by Michael Sweet, 1999
  13
  14    This program is free software; you can redistribute it and/or modify
  15    it under the terms of the GNU General Public License as published by
  16    the Free Software Foundation; either version 3 of the License, or
  17    (at your option) any later version.
  18
  19    This program is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22    GNU General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26 */
  27
  28 /*
  29  *  This module contains code to parse and cache printcap data, possibly
  30  *  in concert with the CUPS/SYSV/AIX-specific code found elsewhere.
  31  *
  32  *  The way this module looks at the printcap file is very simplistic.
  33  *  Only the local printcap file is inspected (no searching of NIS
  34  *  databases etc).
  35  *
  36  *  There are assumed to be one or more printer names per record, held
  37  *  as a set of sub-fields separated by vertical bar symbols ('|') in the
  38  *  first field of the record. The field separator is assumed to be a colon
  39  *  ':' and the record separator a newline.
  40  *
  41  *  Lines ending with a backspace '\' are assumed to flag that the following
  42  *  line is a continuation line so that a set of lines can be read as one
  43  *  printcap entry.
  44  *
  45  *  A line stating with a hash '#' is assumed to be a comment and is ignored
  46  *  Comments are discarded before the record is strung together from the
  47  *  set of continuation lines.
  48  *
  49  *  Opening a pipe for "lpc status" and reading that would probably
  50  *  be pretty effective. Code to do this already exists in the freely
  51  *  distributable PCNFS server code.
  52  */
  53
  54 /* printcap parsing specific code moved here from printing/pcap.c */
  55
  56
  57 #include "includes.h"
  58 #include "system/filesys.h"
  59 #include "printing/pcap.h"
  60
  61 /* handle standard printcap - moved from pcap_printer_fn() */
  62 bool std_pcap_cache_reload(const char *pcap_name, struct pcap_cache **_pcache)
  63 {
  64         XFILE *pcap_file;
  65         char *pcap_line;
  66         struct pcap_cache *pcache = NULL;
  67
  68         if ((pcap_file = x_fopen(pcap_name, O_RDONLY, 0)) == NULL) {
  69                 DEBUG(0, ("Unable to open printcap file %s for read!\n", pcap_name));
  70                 return false;
  71         }
  72
  73         for (; (pcap_line = fgets_slash(NULL, 1024, pcap_file)) != NULL; free(pcap_line)) {
  74                 char name[MAXPRINTERLEN+1];
  75                 char comment[62];
  76                 char *p, *q;
  77
  78                 if (*pcap_line == '#' || *pcap_line == 0)
  79                         continue;
  80
  81                 /* now we have a real printer line - cut at the first : */
  82                 if ((p = strchr_m(pcap_line, ':')) != NULL)
  83                         *p = 0;
  84
  85                 /*
  86                  * now find the most likely printer name and comment
  87                  * this is pure guesswork, but it's better than nothing
  88                  */
  89                 for (*name = *comment = 0, p = pcap_line; p != NULL; p = q) {
  90                         bool has_punctuation;
  91
  92                         if ((q = strchr_m(p, '|')) != NULL)
  93                                 *q++ = 0;
  94
  95                         has_punctuation = (strchr_m(p, ' ') ||
  96                                            strchr_m(p, '\t') ||
  97                                            strchr_m(p, '"') ||
  98                                            strchr_m(p, '\'') ||
  99                                            strchr_m(p, ';') ||
 100                                            strchr_m(p, ',') ||
 101                                            strchr_m(p, '(') ||
 102                                            strchr_m(p, ')'));
 103
 104                         if (strlen(p) > strlen(comment) && has_punctuation) {
 105                                 strlcpy(comment, p, sizeof(comment));
 106                                 continue;
 107                         }
 108
 109                         if (strlen(p) <= MAXPRINTERLEN && *name == '\0' && !has_punctuation) {
 110                                 strlcpy(name, p, sizeof(name));
 111                                 continue;
 112                         }
 113
 114                         if (!strchr_m(comment, ' ') &&
 115                             strlen(p) > strlen(comment)) {
 116                                 strlcpy(comment, p, sizeof(comment));
 117                                 continue;
 118                         }
 119                 }
 120
 121                 if ((*name != '\0')
 122                  && !pcap_cache_add_specific(&pcache, name, comment, NULL)) {
 123                         x_fclose(pcap_file);
 124                         pcap_cache_destroy_specific(&pcache);
 125                         return false;
 126                 }
 127         }
 128
 129         x_fclose(pcap_file);
 130         *_pcache = pcache;
 131         return true;
 132 }