Cosmetic changes in the license header.

[dus.git] / dus.c

diff --git a/dus.c b/dus.c
index d1774df..5b19766 100644 (file)
--- a/dus.c
+++ b/dus.c
@@ -1,9 +1,9 @@
 
 /*
- *  dus is a simple utility designed to display the list of files and
- *  directories with disk occupancy, sorted according to it.
+ *  dus is a simple utility to display the files and directories
+ *  according to their total disk occupancy.
  *
- *  Copyright (c) 2009 Francois Fleuret
+ *  Copyright (c) 2010 Francois Fleuret
  *  Written by Francois Fleuret <francois@fleuret.org>
  *
  *  This file is part of dus.
@@ -32,24 +32,23 @@
 #include <unistd.h>
 #include <errno.h>
 #include <string.h>
+#include <sys/ioctl.h>
 
-struct file_with_size {
-  char *filename;
-  size_t size;
-  struct file_with_size *next;
-};
+#define BUFFER_SIZE 1024
+
+typedef int64_t size_sum_t;
 
-size_t file_or_dir_size(char *name) {
+size_sum_t file_or_dir_size(char *name) {
   DIR *dir;
   struct dirent *dir_e;
   struct stat dummy;
-  size_t result;
-  char subname[1024];
+  size_sum_t result;
+  char subname[BUFFER_SIZE];
 
   result = 0;
 
   if(lstat(name, &dummy) != 0) {
-    printf("Can not stat %s (%s).\n", name, strerror(errno));
+    printf("Can not stat %s: %s\n", name, strerror(errno));
     exit (1);
   }
 
@@ -63,13 +62,14 @@ size_t file_or_dir_size(char *name) {
     while((dir_e = readdir(dir))) {
       if(strcmp(dir_e->d_name, ".") &&
          strcmp(dir_e->d_name, "..")) {
-        sprintf(subname, "%s/%s", name, dir_e->d_name);
+        snprintf(subname, BUFFER_SIZE, "%s/%s", name, dir_e->d_name);
         result += file_or_dir_size(subname);
       }
     }
     closedir(dir);
   } else {
     if(S_ISREG(dummy.st_mode)) {
+      /* printf("%d %s\n", dummy.st_size, name); */
       result += dummy.st_size;
     }
   }
@@ -77,6 +77,14 @@ size_t file_or_dir_size(char *name) {
   return result;
 }
 
+/**********************************************************************/
+
+struct file_with_size {
+  char *filename;
+  size_sum_t size;
+  struct file_with_size *next;
+};
+
 struct file_with_size *create(char *name, struct file_with_size *current) {
   struct file_with_size *result;
   result = malloc(sizeof(struct file_with_size));
@@ -86,21 +94,127 @@ struct file_with_size *create(char *name, struct file_with_size *current) {
   return result;
 }
 
+void destroy(struct file_with_size *node) {
+  struct file_with_size *next;
+  while(node) {
+    next = node->next;
+    free(node->filename);
+    free(node);
+    node = next;
+  }
+}
+
+/**********************************************************************/
+
+int compare_files(const void *x1, const void *x2) {
+  const struct file_with_size **f1, **f2;
+
+  f1 = (const struct file_with_size **) x1;
+  f2 = (const struct file_with_size **) x2;
+
+  if((*f1)->size < (*f2)->size) {
+    return -1;
+  } else if((*f1)->size > (*f2)->size) {
+    return 1;
+  } else {
+    return 0;
+  }
+}
+
+
+void print_sorted(struct file_with_size *root, int height) {
+  struct file_with_size *node;
+  struct file_with_size **nodes;
+  int nb, n, first;
+
+  nb = 0;
+  for(node = root; node; node = node->next) {
+    nb++;
+  }
+
+  nodes = malloc(nb * sizeof(struct file_with_size *));
+
+  n = 0;
+  for(node = root; node; node = node->next) {
+    nodes[n++] = node;
+  }
+
+  qsort(nodes, nb, sizeof(struct file_with_size *), compare_files);
+
+  /*
+  for(n = 0; n < nb; n++) {
+    printf("%lld %s\n",
+           nodes[n]->size,
+           nodes[n]->filename);
+  }
+  */
+
+  first = 0;
+  if(height > 0 && height < nb) {
+    first = nb - height;
+  }
+  for(n = first; n < nb; n++) {
+    if(nodes[n]->size < 1024) {
+      printf("% 7d %s\n",
+             ((int) nodes[n]->size),
+             nodes[n]->filename);
+    } else if(nodes[n]->size < 1024 * 1024) {
+      printf("% 6.1fK %s\n",
+             ((double) (nodes[n]->size))/(1024.0),
+             nodes[n]->filename);
+    } else if(nodes[n]->size < 1024 * 1024 * 1024) {
+      printf("% 6.1fM %s\n",
+             ((double) (nodes[n]->size))/(1024.0 * 1024),
+             nodes[n]->filename);
+    } else {
+      printf("% 6.1fG %s\n",
+             ((double) (nodes[n]->size))/(1024.0 * 1024.0 * 1024.0),
+             nodes[n]->filename);
+    }
+  }
+
+  free(nodes);
+}
+
+/**********************************************************************/
+
 int main(int argc, char **argv) {
   int k;
   struct file_with_size *root;
 
   root = 0;
-  for(k = 1; k < argc; k++) {
-    root = create(argv[k], root);
+
+  if(argc > 1) {
+    for(k = 1; k < argc; k++) {
+      root = create(argv[k], root);
+    }
+  } else {
+    DIR *dir;
+    struct dirent *dir_e;
+    dir = opendir(".");
+    if(dir) {
+      while((dir_e = readdir(dir))) {
+        if(strcmp(dir_e->d_name, ".") &&
+           strcmp(dir_e->d_name, "..")) {
+          root = create(dir_e->d_name, root);
+        }
+      }
+      closedir(dir);
+    }
   }
 
-  while(root) {
-    printf("%u %s\n",
-           root->size,
-           root->filename);
-    root = root->next;
+  if(isatty(STDOUT_FILENO)) {
+    struct winsize win;
+    if(ioctl (STDOUT_FILENO, TIOCGWINSZ, (char *) &win)) {
+      printf("Can not get the tty size: %s\n", strerror(errno));
+      exit (1);
+    }
+    print_sorted(root, win.ws_row - 2);
+  } else {
+    print_sorted(root, -1);
   }
 
+  destroy(root);
+
   exit(0);
 }