91 lines
2 KiB
C
91 lines
2 KiB
C
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/* ls.c
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Lists the contents of the directory or directories named on
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the command line, or of the current directory if none are
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named.
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By default, only the name of each file is printed. If "-l" is
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given as the first argument, the type, size, and inumber of
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each file is also printed. This won't work until project 4. */
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#include <syscall.h>
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#include <stdio.h>
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#include <string.h>
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static bool
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list_dir (const char *dir, bool verbose)
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{
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int dir_fd = open (dir);
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if (dir_fd == -1)
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{
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printf ("%s: not found\n", dir);
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return false;
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}
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if (isdir (dir_fd))
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{
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char name[READDIR_MAX_LEN];
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printf ("%s", dir);
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if (verbose)
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printf (" (inumber %d)", inumber (dir_fd));
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printf (":\n");
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while (readdir (dir_fd, name))
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{
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printf ("%s", name);
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if (verbose)
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{
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char full_name[128];
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int entry_fd;
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snprintf (full_name, sizeof full_name, "%s/%s", dir, name);
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entry_fd = open (full_name);
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printf (": ");
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if (entry_fd != -1)
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{
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if (isdir (entry_fd))
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printf ("directory");
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else
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printf ("%d-byte file", filesize (entry_fd));
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printf (", inumber %d", inumber (entry_fd));
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}
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else
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printf ("open failed");
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close (entry_fd);
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}
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printf ("\n");
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}
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}
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else
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printf ("%s: not a directory\n", dir);
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close (dir_fd);
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return true;
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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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bool success = true;
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bool verbose = false;
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if (argc > 1 && !strcmp (argv[1], "-l"))
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{
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verbose = true;
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argv++;
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argc--;
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}
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if (argc <= 1)
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success = list_dir (".", verbose);
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else
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{
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int i;
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for (i = 1; i < argc; i++)
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if (!list_dir (argv[i], verbose))
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success = false;
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}
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return success ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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