/* 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.
 */
/* 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.
 */
//config:config UNAME
//config:       bool "uname"
//config:       default y
//config:       help
//config:         uname is used to print system information.
//config:
//config:config UNAME_OSNAME
//config:       string "Operating system name"
//config:       default "GNU/Linux"
//config:       depends on UNAME
//config:       help
//config:         Sets the operating system name reported by uname -o.  The
//config:         default is "GNU/Linux".

//applet:IF_UNAME(APPLET(uname, BB_DIR_BIN, BB_SUID_DROP))

//kbuild:lib-$(CONFIG_UNAME) += uname.o

/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/uname.html */

//usage:#define uname_trivial_usage
//usage:       "[-amnrspvio]"
//usage:#define uname_full_usage "\n\n"
//usage:       "Print system information\n"
//usage:     "\n        -a      Print all"
//usage:     "\n        -m      The machine (hardware) type"
//usage:     "\n        -n      Hostname"
//usage:     "\n        -r      Kernel release"
//usage:     "\n        -s      Kernel name (default)"
//usage:     "\n        -p      Processor type"
//usage:     "\n        -v      Kernel version"
//usage:     "\n        -i      The hardware platform"
//usage:     "\n        -o      OS name"
//usage:
//usage:#define uname_example_usage
//usage:       "$ uname -a\n"
//usage:       "Linux debian 2.4.23 #2 Tue Dec 23 17:09:10 MST 2003 i686 GNU/Linux\n"

#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(CONFIG_UNAME_OSNAME)];
} 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, CONFIG_UNAME_OSNAME);
#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 */
}