util/lxbios/opts.c

/*****************************************************************************\
 * opts.c
 * $Id: opts.c,v 1.2 2005/12/16 22:45:49 dsp_llnl Exp $
 *****************************************************************************
 *  Copyright (C) 2002-2005 The Regents of the University of California.
 *  Produced at the Lawrence Livermore National Laboratory.
 *  Written by Dave Peterson <dsp@llnl.gov> <dave_peterson@pobox.com>.
 *  UCRL-CODE-2003-012
 *  All rights reserved.
 *
 *  This file is part of lxbios, a utility for reading/writing LinuxBIOS
 *  parameters and displaying information from the LinuxBIOS table.
 *  For details, see <http://www.llnl.gov/linux/lxbios/>.
 *
 *  Please also read the file DISCLAIMER which is included in this software
 *  distribution.
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License (as published by the
 *  Free Software Foundation) version 2, dated June 1991.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the terms and
 *  conditions of the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
\*****************************************************************************/

#include "common.h"
#include "opts.h"

lxbios_op_info_t lxbios_op;

lxbios_op_modifier_info_t lxbios_op_modifiers[LXBIOS_NUM_OP_MODIFIERS];

static char * handle_optional_arg (int argc, char *argv[]);
static void register_op (int *op_found, lxbios_op_t op, char op_param[]);
static void register_op_modifier (lxbios_op_modifier_t mod, char mod_param[]);
static void resolve_op_modifiers (void);
static void sanity_check_args (void);

static const char getopt_string[] = "-ab:B:c::de:hil::np:r:tvw:xX:y:Y";

/****************************************************************************
 * parse_lxbios_args
 *
 * Parse command line arguments.
 ****************************************************************************/
void parse_lxbios_args (int argc, char *argv[])
 { lxbios_op_modifier_info_t *mod_info;
   int i, op_found;
   char c;

   for (i = 0, mod_info = lxbios_op_modifiers;
        i < LXBIOS_NUM_OP_MODIFIERS;
        i++, mod_info++)
    { mod_info->found = FALSE;
      mod_info->found_seq = 0;
      mod_info->param = NULL;
    }

   op_found = FALSE;
   opterr = 0;

   do
    { switch (c = getopt(argc, argv, getopt_string))
       { case 'a':
            register_op(&op_found, LXBIOS_OP_CMOS_SHOW_ALL_PARAMS, NULL);
            break;
         case 'b':
            register_op(&op_found, LXBIOS_OP_WRITE_CMOS_DUMP, optarg);
            break;
         case 'B':
            register_op(&op_found, LXBIOS_OP_READ_CMOS_DUMP, optarg);
            break;
         case 'c':
            register_op(&op_found, LXBIOS_OP_CMOS_CHECKSUM,
                        handle_optional_arg(argc, argv));
            break;
         case 'd':
            register_op(&op_found, LXBIOS_OP_LBTABLE_DUMP, NULL);
            break;
         case 'e':
            register_op(&op_found, LXBIOS_OP_SHOW_PARAM_VALUES, optarg);
            break;
         case 'h':
            register_op(&op_found, LXBIOS_OP_SHOW_USAGE, NULL);
            break;
         case 'i':
            register_op(&op_found, LXBIOS_OP_CMOS_SET_PARAMS_STDIN, NULL);
            break;
         case 'l':
            register_op(&op_found, LXBIOS_OP_LBTABLE_SHOW_INFO,
                        handle_optional_arg(argc, argv));
            break;
         case 'n':
            register_op_modifier(LXBIOS_MOD_SHOW_VALUE_ONLY, NULL);
            break;
         case 'p':
            register_op(&op_found, LXBIOS_OP_CMOS_SET_PARAMS_FILE, optarg);
            break;
         case 'r':
            register_op(&op_found, LXBIOS_OP_CMOS_SHOW_ONE_PARAM, optarg);
            break;
         case 't':
            register_op_modifier(LXBIOS_MOD_USE_CMOS_OPT_TABLE, NULL);
            break;
         case 'v':
            register_op(&op_found, LXBIOS_OP_SHOW_VERSION, NULL);
            break;
         case 'w':
            register_op(&op_found, LXBIOS_OP_CMOS_SET_ONE_PARAM, optarg);
            break;
         case 'x':
            register_op(&op_found, LXBIOS_OP_SHOW_CMOS_HEX_DUMP, NULL);
            break;
         case 'X':
            register_op(&op_found, LXBIOS_OP_SHOW_CMOS_DUMPFILE, optarg);
            break;
         case 'y':
            register_op_modifier(LXBIOS_MOD_USE_CMOS_LAYOUT_FILE, optarg);
            break;
         case 'Y':
            register_op(&op_found, LXBIOS_OP_SHOW_LAYOUT, NULL);
            break;
         case -1:  /* no more command line args */
            break;
         case '?':  /* unknown option found */
         case 1:  /* nonoption command line arg found */
         default:
            usage(stderr);
            break;
       }
    }
   while (c != -1);

   if (!op_found)
      usage(stderr);

   resolve_op_modifiers();
   sanity_check_args();
 }

/****************************************************************************
 * handle_optional_arg
 *
 * Handle a command line option with an optional argument.
 ****************************************************************************/
static char * handle_optional_arg (int argc, char *argv[])
 { char *arg;

   if (optarg != NULL)
    { /* optional arg is present and arg was specified as "-zarg" (with no
       * whitespace between "z" and "arg"), where -z is the option and "arg"
       * is the value of the optional arg
       */
      return optarg;
    }

   if ((argv[optind] == NULL) || (argv[optind][0] == '-'))
      return NULL;

   arg = argv[optind];  /* optional arg is present */

   /* This call to getopt yields the optional arg we just found, which we want
    * to skip.
    */
   getopt(argc, argv, getopt_string);

   return arg;
 }

/****************************************************************************
 * register_op
 *
 * Store the user's selection of which operation this program should perform.
 ****************************************************************************/
static void register_op (int *op_found, lxbios_op_t op, char op_param[])
 { if (*op_found && (op != lxbios_op.op))
      usage(stderr);

   *op_found = TRUE;
   lxbios_op.op = op;
   lxbios_op.param = op_param;
 }

/****************************************************************************
 * register_op_modifier
 *
 * Store information regarding an optional argument specified in addition to
 * the user's selection of which operation this program should perform.
 ****************************************************************************/
static void register_op_modifier (lxbios_op_modifier_t mod, char mod_param[])
 { static int found_seq = 0;
   lxbios_op_modifier_info_t *mod_info;

   mod_info = &lxbios_op_modifiers[mod];
   mod_info->found = TRUE;
   mod_info->found_seq = ++found_seq;
   mod_info->param = mod_param;
 }

/****************************************************************************
 * resolve_op_modifiers
 *
 * If the user specifies multiple arguments that conflict with each other,
 * the last specified argument overrides previous conflicting arguments.
 ****************************************************************************/
static void resolve_op_modifiers (void)
 { if (lxbios_op_modifiers[LXBIOS_MOD_USE_CMOS_LAYOUT_FILE].found &&
       lxbios_op_modifiers[LXBIOS_MOD_USE_CMOS_OPT_TABLE].found)
    { if (lxbios_op_modifiers[LXBIOS_MOD_USE_CMOS_LAYOUT_FILE].found_seq >
          lxbios_op_modifiers[LXBIOS_MOD_USE_CMOS_OPT_TABLE].found_seq)
         lxbios_op_modifiers[LXBIOS_MOD_USE_CMOS_OPT_TABLE].found = FALSE;
      else
         lxbios_op_modifiers[LXBIOS_MOD_USE_CMOS_LAYOUT_FILE].found = FALSE;
    }
 }

/****************************************************************************
 * sanity_check_args
 *
 * Perform sanity checking on command line arguments.
 ****************************************************************************/
static void sanity_check_args (void)
 { if ((lxbios_op_modifiers[LXBIOS_MOD_SHOW_VALUE_ONLY].found) &&
       (lxbios_op.op != LXBIOS_OP_CMOS_SHOW_ONE_PARAM))
      usage(stderr);
 }