clopts_common.c

   1 /* clopts_common.c
   2  * Handle command-line arguments common to Wireshark and TShark
   3  *
   4  * $Id$
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 #include "config.h"
  26
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30
  31 #include "clopts_common.h"
  32 #include "cmdarg_err.h"
  33
  34 int
  35 get_natural_int(const char *string, const char *name)
  36 {
  37   long number;
  38   char *p;
  39
  40   number = strtol(string, &p, 10);
  41   if (p == string || *p != '\0') {
  42     cmdarg_err("The specified %s \"%s\" isn't a decimal number", name, string);
  43     exit(1);
  44   }
  45   if (number < 0) {
  46     cmdarg_err("The specified %s \"%s\" is a negative number", name, string);
  47     exit(1);
  48   }
  49   if (number > INT_MAX) {
  50     cmdarg_err("The specified %s \"%s\" is too large (greater than %d)",
  51                name, string, INT_MAX);
  52     exit(1);
  53   }
  54   return (int)number;
  55 }
  56
  57
  58 int
  59 get_positive_int(const char *string, const char *name)
  60 {
  61   int number;
  62
  63   number = get_natural_int(string, name);
  64
  65   if (number == 0) {
  66     cmdarg_err("The specified %s is zero", name);
  67     exit(1);
  68   }
  69
  70   return number;
  71 }