1#include <stdio.h>
2#include <stdlib.h>
3#include <string.h>
4#include <errno.h>
5#include <sys/statfs.h>
6
7static int ok = EXIT_SUCCESS;
8
9static void printsize(long long n)
10{
11    char unit = 'K';
12    long long t;
13
14    n *= 10;
15
16    if (n > 1024*1024*10) {
17        n /= 1024;
18        unit = 'M';
19    }
20
21    if (n > 1024*1024*10) {
22        n /= 1024;
23        unit = 'G';
24    }
25
26    t = (n + 512) / 1024;
27    printf("%4lld.%1lld%c", t/10, t%10, unit);
28}
29
30static void df(char *s, int always) {
31    struct statfs st;
32
33    if (statfs(s, &st) < 0) {
34        fprintf(stderr, "%s: %s\n", s, strerror(errno));
35        ok = EXIT_FAILURE;
36    } else {
37        if (st.f_blocks == 0 && !always)
38            return;
39        printf("%-20s  ", s);
40        printsize((long long)st.f_blocks * (long long)st.f_bsize);
41        printf("  ");
42        printsize((long long)(st.f_blocks - (long long)st.f_bfree) * st.f_bsize);
43        printf("  ");
44        printsize((long long)st.f_bfree * (long long)st.f_bsize);
45        printf("   %d\n", (int) st.f_bsize);
46    }
47}
48
49int df_main(int argc, char *argv[]) {
50    printf("Filesystem               Size     Used     Free   Blksize\n");
51    if (argc == 1) {
52        char s[2000];
53        FILE *f = fopen("/proc/mounts", "r");
54
55        while (fgets(s, 2000, f)) {
56            char *c, *e = s;
57
58            for (c = s; *c; c++) {
59                if (*c == ' ') {
60                    e = c + 1;
61                    break;
62                }
63            }
64
65            for (c = e; *c; c++) {
66                if (*c == ' ') {
67                    *c = '\0';
68                    break;
69                }
70            }
71
72            df(e, 0);
73        }
74
75        fclose(f);
76    } else {
77        int i;
78
79        for (i = 1; i < argc; i++) {
80            df(argv[i], 1);
81        }
82    }
83
84    exit(ok);
85}
86