df.c revision 09dd3e57b920c8f65cb486313a4c0f35b8cb9f46 
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    n /= 1024;
13    if (n > 1024) {
14        n /= 1024;
15        unit = 'M';
16    }
17    if (n > 1024) {
18        n /= 1024;
19        unit = 'G';
20    }
21    printf("%4lld%c", n, unit);
22}
23
24static void df(char *s, int always) {
25    struct statfs st;
26
27    if (statfs(s, &st) < 0) {
28        fprintf(stderr, "%s: %s\n", s, strerror(errno));
29        ok = EXIT_FAILURE;
30    } else {
31        if (st.f_blocks == 0 && !always)
32            return;
33        printf("%-20s  ", s);
34        printsize((long long)st.f_blocks * (long long)st.f_bsize);
35        printf("  ");
36        printsize((long long)(st.f_blocks - (long long)st.f_bfree) * st.f_bsize);
37        printf("  ");
38        printsize((long long)st.f_bfree * (long long)st.f_bsize);
39        printf("   %d\n", (int) st.f_bsize);
40    }
41}
42
43int df_main(int argc, char *argv[]) {
44    printf("Filesystem             Size   Used   Free   Blksize\n");
45    if (argc == 1) {
46        char s[2000];
47        FILE *f = fopen("/proc/mounts", "r");
48
49        while (fgets(s, 2000, f)) {
50            char *c, *e = s;
51
52            for (c = s; *c; c++) {
53                if (*c == ' ') {
54                    e = c + 1;
55                    break;
56                }
57            }
58
59            for (c = e; *c; c++) {
60                if (*c == ' ') {
61                    *c = '\0';
62                    break;
63                }
64            }
65
66            df(e, 0);
67        }
68
69        fclose(f);
70    } else {
71        int i;
72
73        for (i = 1; i < argc; i++) {
74            df(argv[i], 1);
75        }
76    }
77
78    exit(ok);
79}
80