130 lines
2.4 KiB
C
130 lines
2.4 KiB
C
/*
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* Copyright (C) 2007 Karel Zak <kzak@redhat.com>
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*
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* This file is part of util-linux.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <limits.h>
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typedef struct {
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const char *name;
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int (*fnc)(void);
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} mntHlpfnc;
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static int hlp_wordsize(void)
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{
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printf("%zu\n", CHAR_BIT * sizeof(void*));
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return 0;
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}
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static int hlp_endianness(void)
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{
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#if !defined(WORDS_BIGENDIAN)
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printf("LE\n");
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#else
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printf("BE\n");
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#endif
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return 0;
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}
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static int hlp_pagesize(void)
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{
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printf("%d\n", getpagesize());
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return 0;
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}
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static int hlp_int_max(void)
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{
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printf("%d\n", INT_MAX);
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return 0;
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}
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static int hlp_uint_max(void)
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{
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printf("%u\n", UINT_MAX);
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return 0;
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}
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static int hlp_long_max(void)
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{
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printf("%ld\n", LONG_MAX);
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return 0;
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}
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static int hlp_ulong_max(void)
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{
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printf("%lu\n", ULONG_MAX);
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return 0;
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}
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static int hlp_ulong_max32(void)
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{
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#if __WORDSIZE == 64
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printf("%lu\n", ULONG_MAX >> 32);
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#else
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printf("%lu\n", ULONG_MAX);
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#endif
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return 0;
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}
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static mntHlpfnc hlps[] =
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{
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{ "WORDSIZE", hlp_wordsize },
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{ "pagesize", hlp_pagesize },
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{ "INT_MAX", hlp_int_max },
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{ "UINT_MAX", hlp_uint_max },
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{ "LONG_MAX", hlp_long_max },
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{ "ULONG_MAX", hlp_ulong_max },
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{ "ULONG_MAX32",hlp_ulong_max32 },
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{ "byte-order", hlp_endianness },
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{ NULL, NULL }
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};
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int main(int argc, char **argv)
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{
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int re = 0;
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mntHlpfnc *fn;
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if (argc == 1) {
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for (fn = hlps; fn->name; fn++) {
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printf("%15s: ", fn->name);
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re += fn->fnc();
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}
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} else {
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int i;
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if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-h") == 0) {
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printf("%s <option>\n", argv[0]);
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fputs("options:\n", stdout);
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for (fn = hlps; fn->name; fn++)
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printf("\t%s\n", fn->name);
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exit(EXIT_SUCCESS);
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}
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for (i=1; i < argc; i++) {
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for (fn = hlps; fn->name; fn++) {
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if (strcmp(fn->name, argv[i]) == 0)
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re += fn->fnc();
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}
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}
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}
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exit(re ? EXIT_FAILURE : EXIT_SUCCESS);
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}
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