Removed submodules

2026-05-31 14:34:00 -04:00
commit 46c36b11da
352 changed files with 14792 additions and 0 deletions
@@ -0,0 +1,148 @@
+#define _GNU_SOURCE
+#include <dirent.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#define MAX_PATH_LEN 4096
+
+static void usage (void) __attribute__ ((unused));
+
+// WARNING WARNING WARNING:
+// When using opendir and readdir to read directory listings, the files
+// are returned in the order they were created. There is randomness to that
+// creation that can cause tests to fail. You MUST sort the file names as
+// expected in the test case files. To avoid making your task harder than
+// it needs to be, we strongly suggest you use scandir instead.
+
+int
+filename_cmp (const struct dirent **a, const struct dirent **b)
+{
+  const char *name1 = (*a)->d_name;
+  const char *name2 = (*b)->d_name;
+
+  while (*name1 == '.')
+    name1++;
+  while (*name2 == '.')
+    name2++;
+
+  return strcasecmp (name1, name2);
+}
+
+void
+print_permissions (mode_t mode)
+{
+  char perms[11];
+
+  perms[0] = S_ISDIR (mode) ? 'd' : '-';
+  perms[1] = (mode & S_IRUSR) ? 'r' : '-';
+  perms[2] = (mode & S_IWUSR) ? 'w' : '-';
+  perms[3] = (mode & S_IXUSR) ? 'x' : '-';
+  perms[4] = (mode & S_IRGRP) ? 'r' : '-';
+  perms[5] = (mode & S_IWGRP) ? 'w' : '-';
+  perms[6] = (mode & S_IXGRP) ? 'x' : '-';
+  perms[7] = (mode & S_IROTH) ? 'r' : '-';
+  perms[8] = (mode & S_IWOTH) ? 'w' : '-';
+  perms[9] = (mode & S_IXOTH) ? 'x' : '-';
+  perms[10] = '\0';
+
+  printf ("%s", perms);
+}
+
+int
+main (int argc, char *argv[])
+{
+  int opt;
+  int a_flag = false, p_flag = false, s_flag = false;
+
+  while ((opt = getopt (argc, argv, "aps")) != -1)
+    {
+      switch (opt)
+        {
+        case 'a':
+          a_flag = true;
+          break;
+        case 'p':
+          p_flag = true;
+          break;
+        case 's':
+          s_flag = true;
+          break;
+        default:
+          printf ("./bin/ls: invalid option -- \'%c\'\n", optopt);
+          exit (EXIT_FAILURE);
+        }
+    }
+
+  char *dirname = optind < argc ? argv[optind] : ".";
+  struct stat dirstat;
+
+  if (stat(dirname, &dirstat) != 0) {
+    return EXIT_FAILURE;
+  }
+
+  struct dirent **namelist;
+  int n = scandir (dirname, &namelist, NULL, filename_cmp);
+
+  for (int i = 0; i < n; i++)
+    {
+      char path[MAX_PATH_LEN];
+      snprintf (path, sizeof (path), "%s/%s", dirname, namelist[i]->d_name);
+
+      struct stat st;
+      lstat (path, &st);
+
+      bool dot_dir = strcmp (namelist[i]->d_name, ".") == 0
+                     || strcmp (namelist[i]->d_name, "..") == 0;
+
+      bool hidden = namelist[i]->d_name[0] == '.';
+
+      if (dot_dir || (!a_flag && hidden) || (s_flag && S_ISDIR (st.st_mode)))
+        {
+          free (namelist[i]);
+          continue;
+        }
+
+      if (s_flag)
+        {
+          printf ("%ld ", st.st_size);
+        }
+
+      if (p_flag)
+        {
+          print_permissions (st.st_mode);
+          printf (" ");
+        }
+
+      printf ("%s\n", namelist[i]->d_name);
+
+      free (namelist[i]);
+    }
+  free (namelist);
+
+  return EXIT_SUCCESS;
+}
+
+static void
+usage (void)
+{
+  printf ("ls, list directory contents\n");
+  printf ("usage: ls [FLAG ...] [DIR]\n");
+  printf ("FLAG is one or more of:\n");
+  printf ("  -a       list all files (even hidden ones)\n");
+  printf ("  -p       list permission bitmask\n");
+  printf ("  -s       list file sizes\n");
+  printf ("If no DIR specified, list current directory contents.\n\n");
+  printf ("Files must be sorted alphabetically, case insensitive.\n");
+  printf ("Leading dots should be ignored when sorting.\n\n");
+  printf ("With the -s flag, do not show entries for subdirectories.\n");
+  printf ("Permission bitmasks are 10-character strings such as:\n");
+  printf ("  -rwxr-x---\n\n");
+  printf (
+      "The first character is d for directories and - for regular files.\n\n");
+  printf ("Do not show the \".\" or \"..\" directory entries.\n");
+}