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
  25 #include "stdinc.h"
  26
  27 #include "ircd_getopt.h"
  28
  29 # define OPTCHAR '-'
  30
  31 void
  32 parseargs(int *argc, char ***argv, struct lgetopt *opts)
  33 {
  34         int i;
  35         char *progname = (*argv)[0];
  36
  37         /* loop through each argument */
  38         for (;;)
  39         {
  40                 int found = 0;
  41
  42                 (*argc)--;
  43                 (*argv)++;
  44
  45                 if(*argc < 1)
  46                 {
  47                         return;
  48                 }
  49
  50                 /* check if it *is* an arg.. */
  51                 if((*argv)[0][0] != OPTCHAR)
  52                 {
  53                         return;
  54                 }
  55
  56                 (*argv)[0]++;
  57
  58                 /* search through our argument list, and see if it matches */
  59                 for (i = 0; opts[i].opt; i++)
  60                 {
  61                         if(!strcmp(opts[i].opt, (*argv)[0]))
  62                         {
  63                                 /* found our argument */
  64                                 found = 1;
  65
  66                                 switch (opts[i].argtype)
  67                                 {
  68                                 case YESNO:
  69                                         *((int *) opts[i].argloc) = 1;
  70                                         break;
  71                                 case INTEGER:
  72                                         if(*argc < 2)
  73                                         {
  74                                                 fprintf(stderr,
  75                                                         "Error: option '%c%s' requires an argument\n",
  76                                                         OPTCHAR, opts[i].opt);
  77                                                 usage((*argv)[0]);
  78                                         }
  79
  80                                         *((int *) opts[i].argloc) = atoi((*argv)[1]);
  81
  82                                         (*argc)--;
  83                                         (*argv)++;
  84                                         break;
  85                                 case STRING:
  86                                         if(*argc < 2)
  87                                         {
  88                                                 fprintf(stderr,
  89                                                         "error: option '%c%s' requires an argument\n",
  90                                                         OPTCHAR, opts[i].opt);
  91                                                 usage(progname);
  92                                         }
  93
  94                                         *((char **) opts[i].argloc) =
  95                                                 malloc(strlen((*argv)[1]) + 1);
  96                                         strcpy(*((char **) opts[i].argloc), (*argv)[1]);
  97
  98                                         (*argc)--;
  99                                         (*argv)++;
 100                                         break;
 101
 102                                 case USAGE:
 103                                         usage(progname);
 104                                  /*NOTREACHED*/ default:
 105                                         fprintf(stderr,
 106                                                 "Error: internal error in parseargs() at %s:%d\n",
 107                                                 __FILE__, __LINE__);
 108                                         exit(EXIT_FAILURE);
 109                                 }
 110                         }
 111                 }
 112                 if(!found)
 113                 {
 114                         fprintf(stderr, "error: unknown argument '%c%s'\n", OPTCHAR, (*argv)[0]);
 115                         usage(progname);
 116                 }
 117         }
 118 }
 119
 120 void
 121 usage(char *name)
 122 {
 123         int i = 0;
 124
 125         fprintf(stderr, "Usage: %s [options]\n", name);
 126         fprintf(stderr, "Where valid options are:\n");
 127
 128         for (i = 0; myopts[i].opt; i++)
 129         {
 130                 fprintf(stderr, "\t%c%-10s %-20s%s\n", OPTCHAR,
 131                         myopts[i].opt, (myopts[i].argtype == YESNO
 132                                         || myopts[i].argtype ==
 133                                         USAGE) ? "" : myopts[i].argtype ==
 134                         INTEGER ? "<number>" : "<string>", myopts[i].desc);
 135         }
 136
 137         exit(EXIT_FAILURE);
 138 }