1 /*
2 * DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
3 * Version 2, December 2004
4 *
5 * Copyright (C) 2016 Olaf Wintermann <olaf.wintermann@gmail.com>
6 *
7 * Everyone is permitted to copy and distribute verbatim or modified
8 * copies of this license document, and changing it is allowed as long
9 * as the name is changed.
10 *
11 * DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
12 * TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
13 *
14 * 0. You just DO WHAT THE FUCK YOU WANT TO.
15 */
16
17 #include <sys/types.h>
18 #include <sys/xattr.h>
19 #include <unistd.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <errno.h>
24
25 #define BUF_LEN 1024
26
27 int main(int argc, char **argv) {
28 if(argc != 2) {
29 fprintf(stderr, "Usage: %s <file>\n", argv[0]);
30 return -1;
31 }
32
33 char *path = argv[1];
34
35 // get list of extended attribute names
36 char *list = malloc(BUF_LEN);
37 ssize_t len = listxattr(path, list, BUF_LEN);
38
39 if(len == -1) {
40 switch(errno) {
41 case ERANGE: {
42 // buffer too, get size of attribute list
43 ssize_t newlen = listxattr(path, NULL, 0);
44 if(newlen > 0) {
45 // second try
46 list = realloc(list, newlen);
47 len = listxattr(path, list, newlen);
48 if(len != -1) {
49 // this time it worked
50 break;
51 }
52 }
53 }
54 default: perror("listxattr");
55 free(list);
56 return -1;
57 }
58 }
59
60 // print list
61 int begin = 0;
62 for(int i=0;i<len;i++) {
63 if(list[i] == '\0') {
64 printf("%s\n", list + begin);
65 begin = i + 1;
66 }
67 }
68
69 free(list);
70
71 return 0;
72 }
73