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
  26 #include "stdinc.h"
  27
  28 #include "ircd_getopt.h"
  29
  30 # define OPTCHAR '-'
  31
  32 void
  33 parseargs(int *argc, char ***argv, struct lgetopt *opts)
  34 {
  35         int i;
  36         char *progname = (*argv)[0];
  37
  38         /* loop through each argument */
  39         for (;;)
  40         {
  41                 int found = 0;
  42
  43                 (*argc)--;
  44                 (*argv)++;
  45
  46                 if(*argc < 1)
  47                 {
  48                         return;
  49                 }
  50
  51                 /* check if it *is* an arg.. */
  52                 if((*argv)[0][0] != OPTCHAR)
  53                 {
  54                         return;
  55                 }
  56
  57                 (*argv)[0]++;
  58
  59                 /* search through our argument list, and see if it matches */
  60                 for (i = 0; opts[i].opt; i++)
  61                 {
  62                         if(!strcmp(opts[i].opt, (*argv)[0]))
  63                         {
  64                                 /* found our argument */
  65                                 found = 1;
  66
  67                                 switch (opts[i].argtype)
  68                                 {
  69                                 case YESNO:
  70                                         *((int *) opts[i].argloc) = 1;
  71                                         break;
  72                                 case INTEGER:
  73                                         if(*argc < 2)
  74                                         {
  75                                                 fprintf(stderr,
  76                                                         "Error: option '%c%s' requires an argument\n",
  77                                                         OPTCHAR, opts[i].opt);
  78                                                 usage((*argv)[0]);
  79                                         }
  80
  81                                         *((int *) opts[i].argloc) = atoi((*argv)[1]);
  82
  83                                         (*argc)--;
  84                                         (*argv)++;
  85                                         break;
  86                                 case STRING:
  87                                         if(*argc < 2)
  88                                         {
  89                                                 fprintf(stderr,
  90                                                         "error: option '%c%s' requires an argument\n",
  91                                                         OPTCHAR, opts[i].opt);
  92                                                 usage(progname);
  93                                         }
  94
  95                                         *((char **) opts[i].argloc) =
  96                                                 malloc(strlen((*argv)[1]) + 1);
  97                                         strcpy(*((char **) opts[i].argloc), (*argv)[1]);
  98
  99                                         (*argc)--;
 100                                         (*argv)++;
 101                                         break;
 102
 103                                 case USAGE:
 104                                         usage(progname);
 105                                  /*NOTREACHED*/ default:
 106                                         fprintf(stderr,
 107                                                 "Error: internal error in parseargs() at %s:%d\n",
 108                                                 __FILE__, __LINE__);
 109                                         exit(EXIT_FAILURE);
 110                                 }
 111                         }
 112                 }
 113                 if(!found)
 114                 {
 115                         fprintf(stderr, "error: unknown argument '%c%s'\n", OPTCHAR, (*argv)[0]);
 116                         usage(progname);
 117                 }
 118         }
 119 }
 120
 121 void
 122 usage(char *name)
 123 {
 124         int i = 0;
 125
 126         fprintf(stderr, "Usage: %s [options]\n", name);
 127         fprintf(stderr, "Where valid options are:\n");
 128
 129         for (i = 0; myopts[i].opt; i++)
 130         {
 131                 fprintf(stderr, "\t%c%-10s %-20s%s\n", OPTCHAR,
 132                         myopts[i].opt, (myopts[i].argtype == YESNO
 133                                         || myopts[i].argtype ==
 134                                         USAGE) ? "" : myopts[i].argtype ==
 135                         INTEGER ? "<number>" : "<string>", myopts[i].desc);
 136         }
 137
 138         exit(EXIT_FAILURE);
 139 }