src/getopt.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  getopt.c: Uses getopt to fetch the command line options.
   4  *
   5  *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
   6  *  Copyright (C) 1996-2002 Hybrid Development Team
   7  *  Copyright (C) 2002-2005 ircd-ratbox development team
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  22  *  USA
  23  *
  24  *  $Id: getopt.c 6 2005-09-10 01:02:21Z nenolod $
  25  */
  26
  27 #include "stdinc.h"
  28
  29 #include "ircd_getopt.h"
  30
  31 # define OPTCHAR '-'
  32
  33 void
  34 parseargs(int *argc, char ***argv, struct lgetopt *opts)
  35 {
  36         int i;
  37         char *progname = (*argv)[0];
  38
  39         /* loop through each argument */
  40         for (;;)
  41         {
  42                 int found = 0;
  43
  44                 (*argc)--;
  45                 (*argv)++;
  46
  47                 if(*argc < 1)
  48                 {
  49                         return;
  50                 }
  51
  52                 /* check if it *is* an arg.. */
  53                 if((*argv)[0][0] != OPTCHAR)
  54                 {
  55                         return;
  56                 }
  57
  58                 (*argv)[0]++;
  59
  60                 /* search through our argument list, and see if it matches */
  61                 for (i = 0; opts[i].opt; i++)
  62                 {
  63                         if(!strcmp(opts[i].opt, (*argv)[0]))
  64                         {
  65                                 /* found our argument */
  66                                 found = 1;
  67
  68                                 switch (opts[i].argtype)
  69                                 {
  70                                 case YESNO:
  71                                         *((int *) opts[i].argloc) = 1;
  72                                         break;
  73                                 case INTEGER:
  74                                         if(*argc < 2)
  75                                         {
  76                                                 fprintf(stderr,
  77                                                         "Error: option '%c%s' requires an argument\n",
  78                                                         OPTCHAR, opts[i].opt);
  79                                                 usage((*argv)[0]);
  80                                         }
  81
  82                                         *((int *) opts[i].argloc) = atoi((*argv)[1]);
  83
  84                                         (*argc)--;
  85                                         (*argv)++;
  86                                         break;
  87                                 case STRING:
  88                                         if(*argc < 2)
  89                                         {
  90                                                 fprintf(stderr,
  91                                                         "error: option '%c%s' requires an argument\n",
  92                                                         OPTCHAR, opts[i].opt);
  93                                                 usage(progname);
  94                                         }
  95
  96                                         *((char **) opts[i].argloc) =
  97                                                 malloc(strlen((*argv)[1]) + 1);
  98                                         strcpy(*((char **) opts[i].argloc), (*argv)[1]);
  99
 100                                         (*argc)--;
 101                                         (*argv)++;
 102                                         break;
 103
 104                                 case USAGE:
 105                                         usage(progname);
 106                                  /*NOTREACHED*/ default:
 107                                         fprintf(stderr,
 108                                                 "Error: internal error in parseargs() at %s:%d\n",
 109                                                 __FILE__, __LINE__);
 110                                         exit(EXIT_FAILURE);
 111                                 }
 112                         }
 113                 }
 114                 if(!found)
 115                 {
 116                         fprintf(stderr, "error: unknown argument '%c%s'\n", OPTCHAR, (*argv)[0]);
 117                         usage(progname);
 118                 }
 119         }
 120 }
 121
 122 void
 123 usage(char *name)
 124 {
 125         int i = 0;
 126
 127         fprintf(stderr, "Usage: %s [options]\n", name);
 128         fprintf(stderr, "Where valid options are:\n");
 129
 130         for (i = 0; myopts[i].opt; i++)
 131         {
 132                 fprintf(stderr, "\t%c%-10s %-20s%s\n", OPTCHAR,
 133                         myopts[i].opt, (myopts[i].argtype == YESNO
 134                                         || myopts[i].argtype ==
 135                                         USAGE) ? "" : myopts[i].argtype ==
 136                         INTEGER ? "<number>" : "<string>", myopts[i].desc);
 137         }
 138
 139         exit(EXIT_FAILURE);
 140 }