text: /* vi: set sw=4 ts=4: */
  /* uname -- print system information
   * Copyright (C) 1989-1999 Free Software Foundation, Inc.
   *
   * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   */
  
  /* BB_AUDIT SUSv3 compliant */
  /* http://www.opengroup.org/onlinepubs/007904975/utilities/uname.html */
  
  /* Option		Example
   * -s, --sysname	SunOS
   * -n, --nodename	rocky8
   * -r, --release	4.0
   * -v, --version
   * -m, --machine	sun
   * -a, --all		SunOS rocky8 4.0  sun
   *
   * The default behavior is equivalent to '-s'.
   *
   * David MacKenzie <djm@gnu.ai.mit.edu>
   *
   * GNU coreutils 6.10:
   * Option:                      struct   Example(s):
   *                              utsname
   *                              field:
   * -s, --kernel-name            sysname  Linux
   * -n, --nodename               nodename localhost.localdomain
   * -r, --kernel-release         release  2.6.29
   * -v, --kernel-version         version  #1 SMP Sun Jan 11 20:52:37 EST 2009
   * -m, --machine                machine  x86_64   i686
   * -p, --processor              (none)   x86_64   i686
   * -i, --hardware-platform      (none)   x86_64   i386
   *      NB: vanilla coreutils reports "unknown" -p and -i,
   *      x86_64 and i686/i386 shown above are Fedora's inventions.
   * -o, --operating-system       (none)   GNU/Linux
   * -a, --all: all of the above, in the order shown.
   *      If -p or -i is not known, don't show them
   */
  
  /* Busyboxed by Erik Andersen
   *
   * Before 2003: Glenn McGrath and Manuel Novoa III
   *  Further size reductions.
   * Mar 16, 2003: Manuel Novoa III (mjn3@codepoet.org)
   *  Now does proper error checking on i/o.  Plus some further space savings.
   * Jan 2009:
   *  Fix handling of -a to not print "unknown", add -o and -i support.
   */
  
  #include "libbb.h"
  /* After libbb.h, since it needs sys/types.h on some systems */
  #include <sys/utsname.h>
  
  typedef struct {
  	struct utsname name;
  	char processor[sizeof(((struct utsname*)NULL)->machine)];
  	char platform[sizeof(((struct utsname*)NULL)->machine)];
  	char os[sizeof("GNU/Linux")];
  } uname_info_t;
  
  static const char options[] ALIGN1 = "snrvmpioa";
  static const unsigned short utsname_offset[] = {
  	offsetof(uname_info_t, name.sysname), /* -s */
  	offsetof(uname_info_t, name.nodename), /* -n */
  	offsetof(uname_info_t, name.release), /* -r */
  	offsetof(uname_info_t, name.version), /* -v */
  	offsetof(uname_info_t, name.machine), /* -m */
  	offsetof(uname_info_t, processor), /* -p */
  	offsetof(uname_info_t, platform), /* -i */
  	offsetof(uname_info_t, os), /* -o */
  };
  
  int uname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  int uname_main(int argc UNUSED_PARAM, char **argv)
  {
  #if ENABLE_LONG_OPTS
  	static const char uname_longopts[] ALIGN1 =
  		/* name, has_arg, val */
  		"all\0"               No_argument       "a"
  		"kernel-name\0"       No_argument       "s"
  		"nodename\0"          No_argument       "n"
  		"kernel-release\0"    No_argument       "r"
  		"release\0"           No_argument       "r"
  		"kernel-version\0"    No_argument       "v"
  		"machine\0"           No_argument       "m"
  		"processor\0"         No_argument       "p"
  		"hardware-platform\0" No_argument       "i"
  		"operating-system\0"  No_argument       "o"
  	;
  #endif
  	uname_info_t uname_info;
  #if defined(__sparc__) && defined(__linux__)
  	char *fake_sparc = getenv("FAKE_SPARC");
  #endif
  	const char *unknown_str = "unknown";
  	const char *fmt;
  	const unsigned short *delta;
  	unsigned toprint;
  
  	IF_LONG_OPTS(applet_long_options = uname_longopts);
  	toprint = getopt32(argv, options);
  
  	if (argv[optind]) { /* coreutils-6.9 compat */
  		bb_show_usage();
  	}
  
  	if (toprint & (1 << 8)) { /* -a => all opts on */
  		toprint = (1 << 8) - 1;
  		unknown_str = ""; /* -a does not print unknown fields */
  	}
  
  	if (toprint == 0) { /* no opts => -s (sysname) */
  		toprint = 1;
  	}
  
  	uname(&uname_info.name); /* never fails */
  
  #if defined(__sparc__) && defined(__linux__)
  	if (fake_sparc && (fake_sparc[0] | 0x20) == 'y') {
  		strcpy(uname_info.name.machine, "sparc");
  	}
  #endif
  	strcpy(uname_info.processor, unknown_str);
  	strcpy(uname_info.platform, unknown_str);
  	strcpy(uname_info.os, "GNU/Linux");
  #if 0
  	/* Fedora does something like this */
  	strcpy(uname_info.processor, uname_info.name.machine);
  	strcpy(uname_info.platform, uname_info.name.machine);
  	if (uname_info.platform[0] == 'i'
  	 && uname_info.platform[1]
  	 && uname_info.platform[2] == '8'
  	 && uname_info.platform[3] == '6'
  	) {
  		uname_info.platform[1] = '3';
  	}
  #endif
  
  	delta = utsname_offset;
  	fmt = " %s" + 1;
  	do {
  		if (toprint & 1) {
  			const char *p = (char *)(&uname_info) + *delta;
  			if (p[0]) {
  				printf(fmt, p);
  				fmt = " %s";
  			}
  		}
  		++delta;
  	} while (toprint >>= 1);
  	bb_putchar('\n');
  
  	fflush_stdout_and_exit(EXIT_SUCCESS); /* coreutils-6.9 compat */
  }
  