1 files changed, 118 insertions, 0 deletions
diff --git a/semestr-5/so/lista5/so21_lista_5/listdir.c b/semestr-5/so/lista5/so21_lista_5/listdir.c
new file mode 100644
index 0000000..9ae906c
--- /dev/null
+++ b/semestr-5/so/lista5/so21_lista_5/listdir.c
@@ -0,0 +1,118 @@
+#include "csapp.h"
+
+#define DIRBUFSZ 256
+
+static void print_mode(mode_t m) {
+  char t;
+
+  if (S_ISDIR(m))
+    t = 'd';
+  else if (S_ISCHR(m))
+    t = 'c';
+  else if (S_ISBLK(m))
+    t = 'b';
+  else if (S_ISREG(m))
+    t = '-';
+  else if (S_ISFIFO(m))
+    t = 'f';
+  else if (S_ISLNK(m))
+    t = 'l';
+  else if (S_ISSOCK(m))
+    t = 's';
+  else
+    t = '?';
+
+  char ur = (m & S_IRUSR) ? 'r' : '-';
+  char uw = (m & S_IWUSR) ? 'w' : '-';
+  char ux = (m & S_IXUSR) ? 'x' : '-';
+  char gr = (m & S_IRGRP) ? 'r' : '-';
+  char gw = (m & S_IWGRP) ? 'w' : '-';
+  char gx = (m & S_IXGRP) ? 'x' : '-';
+  char or = (m & S_IROTH) ? 'r' : '-';
+  char ow = (m & S_IWOTH) ? 'w' : '-';
+  char ox = (m & S_IXOTH) ? 'x' : '-';
+
+  /* TODO: Fix code to report set-uid/set-gid/sticky bit as 'ls' does. */
+  if (m & S_ISUID) ux = 's';
+  if (m & S_ISGID) gx = 's';
+  if (m & S_ISVTX) ox = 't';
+
+  printf("%c%c%c%c%c%c%c%c%c%c", t, ur, uw, ux, gr, gw, gx, or, ow, ox);
+}
+
+static void print_uid(uid_t uid) {
+  struct passwd *pw = getpwuid(uid);
+  if (pw)
+    printf(" %10s", pw->pw_name);
+  else
+    printf(" %10d", uid);
+}
+
+static void print_gid(gid_t gid) {
+  struct group *gr = getgrgid(gid);
+  if (gr)
+    printf(" %10s", gr->gr_name);
+  else
+    printf(" %10d", gid);
+}
+
+static void file_info(int dirfd, const char *name) {
+  struct stat sb[1];
+
+  /* TODO: Read file metadata. */
+  fstatat(dirfd, name, sb, AT_SYMLINK_NOFOLLOW);
+
+  print_mode(sb->st_mode);
+  printf("%4ld", sb->st_nlink);
+  print_uid(sb->st_uid);
+  print_gid(sb->st_gid);
+
+  /* TODO: For devices: print major/minor pair; for other files: size. */
+  if (S_ISCHR(sb->st_mode) || S_ISBLK(sb->st_mode)) {
+    int mi = minor(sb->st_rdev);
+    int ma = major(sb->st_rdev);
+    printf(" %d,\t%d", mi, ma);
+  }
+  else {
+    printf("\t%ld", sb->st_size);
+  }
+
+  char *now = ctime(&sb->st_mtime);
+  now[strlen(now) - 1] = '\0';
+  printf("%26s", now);
+
+  printf("  %s", name);
+
+  if (S_ISLNK(sb->st_mode)) {
+  /* TODO: Read where symlink points to and print '-> destination' string. */
+    char buf[300];
+    size_t len = readlinkat(dirfd, name, buf, sizeof(buf));
+    buf[len] = 0;
+    printf("-> %s", buf);  
+  }
+
+  putchar('\n');
+}
+
+int main(int argc, char *argv[]) {
+  if (!argv[1])
+    argv[1] = ".";
+
+  int dirfd = Open(argv[1], O_RDONLY | O_DIRECTORY, 0);
+  char buf[DIRBUFSZ];
+  int n;
+
+  while ((n = Getdents(dirfd, (void *)buf, DIRBUFSZ))) {
+    struct linux_dirent *d;
+    /* TODO: Iterate over directory entries and call file_info on them. */
+    int offset = 0;
+    while (offset < n) {
+      d = (struct linux_dirent *)(buf + offset);
+      offset += d->d_reclen;
+      file_info(dirfd, d->d_name);
+    }
+  }
+
+  Close(dirfd);
+  return EXIT_SUCCESS;
+}