77 lines
1.5 KiB
C
Executable File
77 lines
1.5 KiB
C
Executable File
#include <sys/stat.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/file.h>
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#include <sys/types.h>
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int
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acs(const char *name, int mode)
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{
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struct stat st;
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if (lstat(name, &st) < 0) {
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return -1;
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}
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uid_t uid = getuid();
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if (uid == 0) {
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return 0;
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}
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uid_t st_mode = st.st_mode;
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if (st.st_mode == uid) {
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st_mode >>= 6;
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} else if (st.st_gid == getgid()) {
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st_mode >>= 3;
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}
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st_mode &= 7;
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// for (int i = 0; i < 3; ++i) {
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// if (st_mode ^ mode & 1) {
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// return -1;
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// }
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// st_mode >>= 1;
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// mode >>= 1;
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// }
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if (st_mode & mode == mode) {
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return 0;
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}
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return -1;
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}
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int
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main(int argc, char *argv[])
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{
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struct stat st;
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for (int i = 1; i < argc; i++) {
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if (lstat(argv[i], &st) < 0) {
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continue;
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}
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char type;
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if (S_ISREG(st.st_mode)) {
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type = '-';
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} else if (S_ISDIR(st.st_mode)) {
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type = 'd';
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} else if (S_ISLNK(st.st_mode)) {
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type = 'l';
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} else {
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type = '?';
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}
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char m[] = "rwxrwxrwx";
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for (int j = 0; j < 9; j++) {
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if (!((st.st_mode >> j) & 1)) {
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m[8 - j] = '-';
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}
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}
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printf("%c%s %lu %hu %lu %ld %s\n", type, m, st.st_nlink, st.st_uid, st.st_size, st.st_ctime, argv[i]);
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}
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return 0;
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}
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