From: Francois Fleuret <francois@fleuret.org>
Date: Fri, 26 Feb 2010 17:17:51 +0000 (+0100)
Subject: Added the option parsing.
X-Git-Url: https://fleuret.org/cgi-bin/gitweb/gitweb.cgi?a=commitdiff_plain;h=a05803ca317f043c88c4c7e6a3f5390fbc996697;p=dus.git

Added the option parsing.
---

diff --git a/dus.c b/dus.c
index a4b5d0a..3a4d7f4 100644
--- a/dus.c
+++ b/dus.c
@@ -34,12 +34,22 @@
 #include <string.h>
 #include <sys/ioctl.h>
 #include <locale.h>
+#include <getopt.h>
 
 #define BUFFER_SIZE 4096
 
 typedef int64_t size_sum_t;
 
-int ignore_dotfiles = 1;
+/* Yeah, global variables! */
+
+int ignore_dotfiles = 0; /* 1 means ignore files and directories
+                            starting with a dot */
+
+int forced_height = 0; /* -1 means no height limit, strictly positive
+                           means limit, 0 means not active */
+
+int fancy_size_display = 0; /* 1 means to use floating values with K, M and G
+                               as units */
 
 /********************************************************************/
 
@@ -50,6 +60,21 @@ int ignore_entry(const char *name) {
     (ignore_dotfiles && name[0] == '.');
 }
 
+void print_size_sum(size_sum_t s) {
+  char tmp[100];
+  char *a = tmp + sizeof(tmp)/sizeof(char);
+  *(--a) = '\0';
+  if(s) {
+    while(s) {
+      *(--a) = s%10 + '0';
+      s /= 10;
+    }
+  } else {
+    *(--a) = '0';
+  }
+  printf(a);
+}
+
 size_sum_t file_or_dir_size(const char *name) {
   DIR *dir;
   struct dirent *dir_e;
@@ -61,7 +86,7 @@ size_sum_t file_or_dir_size(const char *name) {
 
   if(lstat(name, &dummy) != 0) {
     printf("Can not stat %s: %s\n", name, strerror(errno));
-    exit (1);
+    exit(EXIT_FAILURE);
   }
 
   if(S_ISLNK(dummy.st_mode)) {
@@ -80,7 +105,6 @@ size_sum_t file_or_dir_size(const char *name) {
     closedir(dir);
   } else {
     if(S_ISREG(dummy.st_mode)) {
-      /* printf("%d %s\n", dummy.st_size, name); */
       result += dummy.st_size;
     }
   }
@@ -151,35 +175,40 @@ void print_sorted(struct file_with_size *root, int height) {
 
   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(forced_height) {
+    height = forced_height;
   }
-  */
 
-  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);
+
+  if(fancy_size_display) {
+    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);
+      }
+    }
+  } else {
+    for(n = first; n < nb; n++) {
+      print_size_sum(nodes[n]->size);
+      printf(" %s\n", nodes[n]->filename);
     }
   }
 
@@ -189,16 +218,58 @@ void print_sorted(struct file_with_size *root, int height) {
 /**********************************************************************/
 
 int main(int argc, char **argv) {
-  int k;
+  char c;
   struct file_with_size *root;
 
   root = 0;
 
   setlocale (LC_ALL, "");
 
-  if(argc > 1) {
-    for(k = 1; k < argc; k++) {
-      root = create(argv[k], root);
+  while (1) {
+    c = getopt(argc, argv, "dfl:hdu");
+    if (c == -1)
+      break;
+
+    switch (c) {
+
+    case 'd':
+      ignore_dotfiles = 1;
+      break;
+
+    case 'f':
+      fancy_size_display = 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("\n");
+      printf("   -d         do not take into account files starting with a '.'\n");
+      printf("   -f         display size with float values and K, M and G units.\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("   -h         show this help.\n");
+      printf("\n");
+      printf("Report bugs and comments to <francois@fleuret.org>\n");
+      exit(EXIT_SUCCESS);
+
+      break;
+
+    default:
+      exit(EXIT_FAILURE);
+    }
+  }
+
+  if (optind < argc) {
+    while (optind < argc) {
+      root = create(argv[optind++], root);
     }
   } else {
     DIR *dir;
@@ -218,7 +289,7 @@ int main(int argc, char **argv) {
     struct winsize win;
     if(ioctl (STDOUT_FILENO, TIOCGWINSZ, (char *) &win)) {
       printf("Can not get the tty size: %s\n", strerror(errno));
-      exit (1);
+      exit (EXIT_FAILURE);
     }
     print_sorted(root, win.ws_row - 2);
   } else {
@@ -227,5 +298,5 @@ int main(int argc, char **argv) {
 
   destroy(root);
 
-  exit(0);
+  exit(EXIT_SUCCESS);
 }