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/*
* DMS Tools and Utilities
* Copyright (C) 2012 David M. Syzdek <david@syzdek.net>.
*
* @SYZDEK_LICENSE_HEADER_START@
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of David M. Syzdek nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID M. SYZDEK BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @SYZDEK_LICENSE_HEADER_END@
*/
/**
* @file src/endian.c determines the byte order of the system
*/
/*
* Simple Build:
* gcc -W -Wall -O2 -c endian.c
* gcc -W -Wall -O2 -o endian endian.o
*
* GNU Libtool Build:
* libtool --mode=compile gcc -W -Wall -g -O2 -c endian.c
* libtool --mode=link gcc -W -Wall -g -O2 -o endian endian.lo
*
* GNU Libtool Install:
* libtool --mode=install install -c endian /usr/local/bin/endian
*
* GNU Libtool Clean:
* libtool --mode=clean rm -f endian.lo endian
*/
#define _DMSTOOLS_SRC_ENDIAN_C 1
///////////////
// //
// Headers //
// //
///////////////
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>
///////////////////
// //
// i18l Support //
// //
///////////////////
#ifdef HAVE_GETTEXT
# include <gettext.h>
# include <libintl.h>
# define _(String) gettext (String)
# define gettext_noop(String) String
# define N_(String) gettext_noop (String)
#else
# define _(String) (String)
# define N_(String) String
# define textdomain(Domain)
# define bindtextdomain(Package, Directory)
#endif
///////////////////
// //
// Definitions //
// //
///////////////////
#ifndef PROGRAM_NAME
#define PROGRAM_NAME "endian"
#endif
#ifndef PACKAGE_BUGREPORT
#define PACKAGE_BUGREPORT "david@syzdek.net"
#endif
#ifndef PACKAGE_COPYRIGHT
#define PACKAGE_COPYRIGHT ""
#endif
#ifndef PACKAGE_NAME
#define PACKAGE_NAME ""
#endif
#ifndef PACKAGE_VERSION
#define PACKAGE_VERSION ""
#endif
//////////////////
// //
// Prototypes //
// //
//////////////////
// determines byte order
int is_big_endian(void);
// main statement
int main(int argc, char * argv[]);
//displays usage information
void my_usage(void);
// displays version information
void my_version(void);
/////////////////
// //
// Functions //
// //
/////////////////
/// determines byte order
int is_big_endian(void)
{
union
{
uint32_t i;
char c[4];
} endian = { 0x01020304 };
return((endian.c[0] == 1));
}
/// main statement
/// @param[in] argc number of arguments
/// @param[in] argv array of arguments
int main(int argc, char * argv[])
{
int c;
int opt_index;
// getopt options
static char short_opt[] = "hV";
static struct option long_opt[] =
{
{"help", no_argument, 0, 'h'},
{"version", no_argument, 0, 'V'},
{NULL, 0, 0, 0 }
};
while((c = getopt_long(argc, argv, short_opt, long_opt, &opt_index)) != -1)
{
switch(c)
{
case -1: /* no more arguments */
case 0: /* long options toggles */
break;
case 'h':
my_usage();
return(0);
case 'V':
my_version();
return(0);
case '?':
fprintf(stderr, _("Try `%s --help' for more information.\n"), PROGRAM_NAME);
return(1);
default:
fprintf(stderr, _("%s: unrecognized option `--%c'\n"
"Try `%s --help' for more information.\n"
), PROGRAM_NAME, c, PROGRAM_NAME
);
return(1);
};
};
// checks for extra arguments
if (optind != argc)
{
fprintf(stderr, _("%s: unknown option `%s'\n"), PROGRAM_NAME, argv[optind]);
fprintf(stderr, _("Try `%s --help' for more information.\n"), PROGRAM_NAME);
return(1);
};
// prints byte order
if ((is_big_endian()))
printf("big endian\n");
else
printf("little endian\n");
return(0);
}
/// displays usage information
void my_usage()
{
// TRANSLATORS: The following strings provide usage for command. These
// strings are displayed if the program is passed `--help' on the command
// line. The two strings referenced are: PROGRAM_NAME, and
// PACKAGE_BUGREPORT
printf(_("Usage: %s\n"
"\n"
"Report bugs to <%s>.\n"
), PROGRAM_NAME, PACKAGE_BUGREPORT
);
return;
}
/// displays version information
void my_version(void)
{
// TRANSLATORS: The following strings provide version and copyright
// information if the program is passed --version on the command line.
// The three strings referenced are: PROGRAM_NAME, PACKAGE_NAME,
// PACKAGE_VERSION.
printf(_("%s (%s) %s\n"
"Written by David M. Syzdek.\n"
"\n"
"%s\n"
"This is free software; see the source for copying conditions. There is NO\n"
"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
), PROGRAM_NAME, PACKAGE_NAME, PACKAGE_VERSION, PACKAGE_COPYRIGHT
);
return;
}
/* end of source code */