Added an option to revert the sort order.

diff --git a/dus.c b/dus.c
index 3a4d7f4..b6c8851 100644 (file)
--- a/dus.c
+++ b/dus.c
@@ -51,6 +51,8 @@ int forced_height = 0; /* -1 means no height limit, strictly positive
 int fancy_size_display = 0; /* 1 means to use floating values with K, M and G
                                as units */
 
+int reverse_sorting = 0; /* 1 means to show the large ones first */
+
 /********************************************************************/
 
 int ignore_entry(const char *name) {
@@ -147,12 +149,22 @@ int compare_files(const void *x1, const void *x2) {
   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;
+  if(reverse_sorting) {
+    if((*f1)->size < (*f2)->size) {
+      return 1;
+    } else if((*f1)->size > (*f2)->size) {
+      return -1;
+    } else {
+      return 0;
+    }
   } else {
-    return 0;
+    if((*f1)->size < (*f2)->size) {
+      return -1;
+    } else if((*f1)->size > (*f2)->size) {
+      return 1;
+    } else {
+      return 0;
+    }
   }
 }
 
@@ -226,7 +238,7 @@ int main(int argc, char **argv) {
   setlocale (LC_ALL, "");
 
   while (1) {
-    c = getopt(argc, argv, "dfl:hdu");
+    c = getopt(argc, argv, "dfrl:hdu");
     if (c == -1)
       break;
 
@@ -240,21 +252,25 @@ int main(int argc, char **argv) {
       fancy_size_display = 1;
       break;
 
+    case 'r':
+      reverse_sorting = 1;
+      break;
+
     case 'l':
       forced_height = atoi(optarg);
       break;
 
     case 'h':
       printf("Usage: dus [OPTION]... [FILE]...\n");
-      printf("List files and directories sorted according to their size or content \n");
-      printf("size.\n");
+      printf("List files and directories sorted according to their size or content size (the content of the current directory by default).\n");
       printf("\n");
-      printf("   -d         do not take into account files starting with a '.'\n");
+      printf("   -d         ignore files and directories starting with a '.'\n");
       printf("   -f         display size with float values and K, M and G units.\n");
+      printf("   -r         reverse the sorting order.\n");
       printf("   -l <lines> specificy the number of lines to display. The value -1\n");
       printf("              corresponds to all the lines. By default the command\n");
-      printf("              shows one line less than the number of lines of the TTY,\n");
-      printf("              or all the lines if standard output is not a tty\n");
+      printf("              shows one line less than the height the tty, or all the\n");
+      printf("              lines if the standard output is not a tty.\n");
       printf("   -h         show this help.\n");
       printf("\n");
       printf("Report bugs and comments to <francois@fleuret.org>\n");