1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
typedef struct {
const char *name;
int (*fnc)(void);
} mntHlpfnc;
int
hlp_wordsize(void)
{
printf("%d\n", __WORDSIZE);
return 0;
}
int
hlp_pagesize(void)
{
printf("%d\n", (int) sysconf(_SC_PAGESIZE));
return 0;
}
int
hlp_int_max(void)
{
printf("%d\n", INT_MAX);
return 0;
}
int
hlp_uint_max(void)
{
printf("%u\n", UINT_MAX);
return 0;
}
int
hlp_long_max(void)
{
printf("%ld\n", LONG_MAX);
return 0;
}
int
hlp_ulong_max(void)
{
printf("%lu\n", ULONG_MAX);
return 0;
}
int
hlp_ulong_max32(void)
{
printf("%lu\n", ULONG_MAX >> 32);
return 0;
}
mntHlpfnc hlps[] =
{
{ "WORDSIZE", hlp_wordsize },
{ "pagesize", hlp_pagesize },
{ "INT_MAX", hlp_int_max },
{ "UINT_MAX", hlp_uint_max },
{ "LONG_MAX", hlp_long_max },
{ "ULONG_MAX", hlp_ulong_max },
{ "ULONG_MAX32",hlp_ulong_max32 },
{ NULL, NULL }
};
int
main(int argc, char **argv)
{
int re = 0;
mntHlpfnc *fn;
if (argc == 1) {
for (fn = hlps; fn->name; fn++) {
printf("%15s: ", fn->name);
re += fn->fnc();
}
} else {
int i;
if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-h") == 0) {
printf("%s <option>\n", argv[0]);
fputs("options:\n", stdout);
for (fn = hlps; fn->name; fn++)
printf("\t%s\n", fn->name);
exit(EXIT_SUCCESS);
}
for (i=1; i < argc; i++) {
for (fn = hlps; fn->name; fn++) {
if (strcmp(fn->name, argv[i]) == 0)
re += fn->fnc();
}
}
}
exit(re ? EXIT_FAILURE : EXIT_SUCCESS);
}
|
