contrib/bind/lib/isc/commandline.c

   1 /*
   2  * Portions Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Portions Copyright (C) 1999-2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /*
  19  * Copyright (c) 1987, 1993, 1994
  20  *      The Regents of the University of California.  All rights reserved.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the above copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *      This product includes software developed by the University of
  33  *      California, Berkeley and its contributors.
  34  * 4. Neither the name of the University nor the names of its contributors
  35  *    may be used to endorse or promote products derived from this software
  36  *    without specific prior written permission.
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  39  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  41  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  42  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  43  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  44  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  45  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  46  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  47  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  48  * SUCH DAMAGE.
  49  */
  50
  51 /* $Id: commandline.c,v 1.20 2007/06/19 23:47:17 tbox Exp $ */
  52
  53 /*! \file
  54  * This file was adapted from the NetBSD project's source tree, RCS ID:
  55  *    NetBSD: getopt.c,v 1.15 1999/09/20 04:39:37 lukem Exp
  56  *
  57  * The primary change has been to rename items to the ISC namespace
  58  * and format in the ISC coding style.
  59  */
  60
  61 /*
  62  * \author Principal Authors: Computer Systems Research Group at UC Berkeley
  63  * \author Principal ISC caretaker: DCL
  64  */
  65
  66 #include <config.h>
  67
  68 #include <stdio.h>
  69
  70 #include <isc/commandline.h>
  71 #include <isc/msgs.h>
  72 #include <isc/string.h>
  73 #include <isc/util.h>
  74
  75 /*% Index into parent argv vector. */
  76 LIBISC_EXTERNAL_DATA int isc_commandline_index = 1;
  77 /*% Character checked for validity. */
  78 LIBISC_EXTERNAL_DATA int isc_commandline_option;
  79 /*% Argument associated with option. */
  80 LIBISC_EXTERNAL_DATA char *isc_commandline_argument;
  81 /*% For printing error messages. */
  82 LIBISC_EXTERNAL_DATA char *isc_commandline_progname;
  83 /*% Print error messages. */
  84 LIBISC_EXTERNAL_DATA isc_boolean_t isc_commandline_errprint = ISC_TRUE;
  85 /*% Reset processing. */
  86 LIBISC_EXTERNAL_DATA isc_boolean_t isc_commandline_reset = ISC_TRUE;
  87
  88 static char endopt = '\0';
  89
  90 #define BADOPT  '?'
  91 #define BADARG  ':'
  92 #define ENDOPT  &endopt
  93
  94 /*!
  95  * getopt --
  96  *      Parse argc/argv argument vector.
  97  */
  98 int
  99 isc_commandline_parse(int argc, char * const *argv, const char *options) {
 100         static char *place = ENDOPT;
 101         char *option;                   /* Index into *options of option. */
 102
 103         REQUIRE(argc >= 0 && argv != NULL && options != NULL);
 104
 105         /*
 106          * Update scanning pointer, either because a reset was requested or
 107          * the previous argv was finished.
 108          */
 109         if (isc_commandline_reset || *place == '\0') {
 110                 isc_commandline_reset = ISC_FALSE;
 111
 112                 if (isc_commandline_progname == NULL)
 113                         isc_commandline_progname = argv[0];
 114
 115                 if (isc_commandline_index >= argc ||
 116                     *(place = argv[isc_commandline_index]) != '-') {
 117                         /*
 118                          * Index out of range or points to non-option.
 119                          */
 120                         place = ENDOPT;
 121                         return (-1);
 122                 }
 123
 124                 if (place[1] != '\0' && *++place == '-' && place[1] == '\0') {
 125                         /*
 126                          * Found '--' to signal end of options.  Advance
 127                          * index to next argv, the first non-option.
 128                          */
 129                         isc_commandline_index++;
 130                         place = ENDOPT;
 131                         return (-1);
 132                 }
 133         }
 134
 135         isc_commandline_option = *place++;
 136         option = strchr(options, isc_commandline_option);
 137
 138         /*
 139          * Ensure valid option has been passed as specified by options string.
 140          * '-:' is never a valid command line option because it could not
 141          * distinguish ':' from the argument specifier in the options string.
 142          */
 143         if (isc_commandline_option == ':' || option == NULL) {
 144                 if (*place == '\0')
 145                         isc_commandline_index++;
 146
 147                 if (isc_commandline_errprint && *options != ':')
 148                         fprintf(stderr, "%s: %s -- %c\n",
 149                                 isc_commandline_progname,
 150                                 isc_msgcat_get(isc_msgcat,
 151                                                ISC_MSGSET_COMMANDLINE,
 152                                                ISC_MSG_ILLEGALOPT,
 153                                                "illegal option"),
 154                                 isc_commandline_option);
 155
 156                 return (BADOPT);
 157         }
 158
 159         if (*++option != ':') {
 160                 /*
 161                  * Option does not take an argument.
 162                  */
 163                 isc_commandline_argument = NULL;
 164
 165                 /*
 166                  * Skip to next argv if at the end of the current argv.
 167                  */
 168                 if (*place == '\0')
 169                         ++isc_commandline_index;
 170
 171         } else {
 172                 /*
 173                  * Option needs an argument.
 174                  */
 175                 if (*place != '\0')
 176                         /*
 177                          * Option is in this argv, -D1 style.
 178                          */
 179                         isc_commandline_argument = place;
 180
 181                 else if (argc > ++isc_commandline_index)
 182                         /*
 183                          * Option is next argv, -D 1 style.
 184                          */
 185                         isc_commandline_argument = argv[isc_commandline_index];
 186
 187                 else {
 188                         /*
 189                          * Argument needed, but no more argv.
 190                          */
 191                         place = ENDOPT;
 192
 193                         /*
 194                          * Silent failure with "missing argument" return
 195                          * when ':' starts options string, per historical spec.
 196                          */
 197                         if (*options == ':')
 198                                 return (BADARG);
 199
 200                         if (isc_commandline_errprint)
 201                                 fprintf(stderr, "%s: %s -- %c\n",
 202                                         isc_commandline_progname,
 203                                         isc_msgcat_get(isc_msgcat,
 204                                                        ISC_MSGSET_COMMANDLINE,
 205                                                        ISC_MSG_OPTNEEDARG,
 206                                                        "option requires "
 207                                                        "an argument"),
 208                                         isc_commandline_option);
 209
 210                         return (BADOPT);
 211                 }
 212
 213                 place = ENDOPT;
 214
 215                 /*
 216                  * Point to argv that follows argument.
 217                  */
 218                 isc_commandline_index++;
 219         }
 220
 221         return (isc_commandline_option);
 222 }