My latest ramblings.

[oweals/busybox.git] / coreutils / du.c

diff --git a/coreutils/du.c b/coreutils/du.c
index 9e4e11473437f081f43f622356d378e69e46113c..b6ebaca7a067c0dceabe19e8bb17c0e053e6a792 100644 (file)
--- a/coreutils/du.c
+++ b/coreutils/du.c
@@ -1,9 +1,10 @@
+/* vi: set sw=4 ts=4: */
 /*
  * Mini du implementation for busybox
  *
  *
  * Copyright (C) 1999 by Lineo, inc.
- * Written by John Beppu <beppu@line.com>
+ * Written by John Beppu <beppu@lineo.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -22,62 +23,170 @@
  */
 
 #include "internal.h"
+#define BB_DECLARE_EXTERN
+#define bb_need_name_too_long
+#include "messages.c"
+
 #include <sys/types.h>
 #include <fcntl.h>
 #include <dirent.h>
 #include <stdio.h>
-/*
-#include <unistd.h>
-#include <sys/stat.h>
-*/
+#include <errno.h>
+#include <sys/param.h>                 /* for PATH_MAX */
+
+typedef void (Display) (long, char *);
 
+static const char du_usage[] =
+       "du [OPTION]... [FILE]...\n\n"
+       "Summarize disk space used for each FILE and/or directory.\n"
+       "Disk space is printed in units of 1024 bytes.\n\n"
+       "Options:\n"
+       "\t-l\tcount sizes many times if hard linked\n"
+       "\t-s\tdisplay only a total for each argument\n";
 
-typedef void (Display)(size_t, char *);
+static int du_depth = 0;
+static int count_hardlinks = 0;
 
-static void
-print(size_t size, char *filename)
+static Display *print;
+
+static void print_normal(long size, char *filename)
 {
-    fprintf(stdout, "%-7d %s\n", (size >> 1), filename);
+       fprintf(stdout, "%ld\t%s\n", size, filename);
+}
+
+static void print_summary(long size, char *filename)
+{
+       if (du_depth == 1) {
+               print_normal(size, filename);
+       }
 }
 
 /* tiny recursive du */
-static size_t
-size(char *filename)
+static long du(char *filename)
 {
-    struct stat statbuf;
-    size_t     sum;
+       struct stat statbuf;
+       long sum;
+       int len;
+
+       if ((lstat(filename, &statbuf)) != 0) {
+               printf("du: %s: %s\n", filename, strerror(errno));
+               return 0;
+       }
+
+       du_depth++;
+       sum = (statbuf.st_blocks >> 1);
 
-    if ((lstat(filename, &statbuf)) != 0) { return 0; }
-    sum = statbuf.st_blocks;
+       /* Don't add in stuff pointed to by symbolic links */
+       if (S_ISLNK(statbuf.st_mode)) {
+               sum = 0L;
+               if (du_depth == 1)
+                       print(sum, filename);
+       }
+       if (S_ISDIR(statbuf.st_mode)) {
+               DIR *dir;
+               struct dirent *entry;
 
-    if (S_ISDIR(statbuf.st_mode)) {
-       DIR             *dir;
-       struct dirent   *entry;
+               dir = opendir(filename);
+               if (!dir) {
+                       du_depth--;
+                       return 0;
+               }
 
-       dir = opendir(filename);
-       if (!dir) { return 0; }
-       while ((entry = readdir(dir))) {
-           char newfile[512];
-           char *name = entry->d_name;
+               len = strlen(filename);
+               if (filename[len - 1] == '/')
+                       filename[--len] = '\0';
 
-           if (  (strcmp(name, "..") == 0)
-              || (strcmp(name, ".")  == 0)) 
-           { continue; }
+               while ((entry = readdir(dir))) {
+                       char newfile[PATH_MAX + 1];
+                       char *name = entry->d_name;
 
-           sprintf(newfile, "%s/%s", filename, name);
-           sum += size(newfile);
+                       if ((strcmp(name, "..") == 0)
+                               || (strcmp(name, ".") == 0)) {
+                               continue;
+                       }
+
+                       if (len + strlen(name) + 1 > PATH_MAX) {
+                               fprintf(stderr, name_too_long, "du");
+                               du_depth--;
+                               return 0;
+                       }
+                       sprintf(newfile, "%s/%s", filename, name);
+
+                       sum += du(newfile);
+               }
+               closedir(dir);
+               print(sum, filename);
+       }
+       else if (statbuf.st_nlink > 1 && !count_hardlinks) {
+               /* Add files with hard links only once */
+               if (is_in_ino_dev_hashtable(&statbuf, NULL)) {
+                       sum = 0L;
+                       if (du_depth == 1)
+                               print(sum, filename);
+               }
+               else {
+                       add_to_ino_dev_hashtable(&statbuf, NULL);
+               }
        }
-       closedir(dir);
-       print(sum, filename);
-    }
-    return sum;
+       du_depth--;
+       return sum;
 }
 
-int 
-du_main(int argc, char **argv)
+int du_main(int argc, char **argv)
 {
-    /* I'll fill main() in shortly */
-    size(".");
-    exit(0);
+       int i;
+       char opt;
+
+       /* default behaviour */
+       print = print_normal;
+
+       /* parse argv[] */
+       for (i = 1; i < argc; i++) {
+               if (argv[i][0] == '-') {
+                       opt = argv[i][1];
+                       switch (opt) {
+                       case 's':
+                               print = print_summary;
+                               break;
+                       case 'l':
+                               count_hardlinks = 1;
+                               break;
+                       case 'h':
+                       case '-':
+                               usage(du_usage);
+                               break;
+                       default:
+                               fprintf(stderr, "du: invalid option -- %c\n", opt);
+                               usage(du_usage);
+                       }
+               } else {
+                       break;
+               }
+       }
+
+       /* go through remaining args (if any) */
+       if (i >= argc) {
+               du(".");
+       } else {
+               long sum;
+
+               for (; i < argc; i++) {
+                       sum = du(argv[i]);
+                       if (sum && isDirectory(argv[i], FALSE, NULL)) {
+                               print_normal(sum, argv[i]);
+                       }
+                       reset_ino_dev_hashtable();
+               }
+       }
+
+       exit(0);
 }
 
+/* $Id: du.c,v 1.16 2000/03/04 21:19:32 erik Exp $ */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/