X-Git-Url: https://fleuret.org/cgi-bin/gitweb/gitweb.cgi?p=dus.git;a=blobdiff_plain;f=dus.c;h=ac1a7d38203959a12993d7e0d5952a2d9e4f627f;hp=d83f9309f0355061c52bf7d056de4aa453304efd;hb=HEAD;hpb=76bfccae753814ab4a46224fa4ded68a4966a107

diff --git a/dus.c b/dus.c
index d83f930..ac1a7d3 100644
--- 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, 2011 Francois Fleuret
  *  Written by Francois Fleuret <francois@fleuret.org>
  *
  *  This file is part of dus.
@@ -22,10 +22,13 @@
  *
  */
 
-#define _BSD_SOURCE
+#define VERSION_NUMBER "1.3"
+
+#define _DEFAULT_SOURCE
 
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/param.h>
 #include <dirent.h>
 #include <stdlib.h>
 #include <stdio.h>
@@ -33,72 +36,200 @@
 #include <errno.h>
 #include <string.h>
 #include <sys/ioctl.h>
+#include <locale.h>
+#include <getopt.h>
 
-#define BUFFER_SIZE 1024
+#define BUFFER_SIZE 4096
 
 typedef int64_t size_sum_t;
 
-size_sum_t file_or_dir_size(char *name) {
+/* Yeah, global variables! */
+
+int ignore_dotfiles = 0; /* 1 means ignore files and directories
+                            starting with a dot */
+
+int forced_width = 0; /* -1 means no width limit, strictly positive
+                         means limit, 0 means not active */
+
+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 */
+
+int reverse_sorting = 0; /* 1 means to show the large ones first */
+
+int show_top = 0; /* 1 means to show the top of the sorted list
+                     instead of the bottom */
+
+size_sum_t size_min = -1; /* -1 means no minimum size, otherwise lower
+                              bound on the size to display a
+                              file/dir */
+
+int dont_exit_on_protected_files = 0; /* Should we go on when we meet
+                                         files or directories which
+                                         are protected ? */
+
+/********************************************************************/
+
+/* malloc with error checking.  */
+
+void *safe_malloc(size_t n) {
+  void *p = malloc(n);
+  if (!p && n != 0) {
+    fprintf(stderr,
+            "dus: Can not allocate memory: %s\n",
+            strerror(errno));
+    exit(EXIT_FAILURE);
+  }
+  return p;
+}
+
+/********************************************************************/
+
+int ignore_entry(const char *name) {
+  return
+    strcmp(name, ".") == 0 ||
+    strcmp(name, "..") == 0 ||
+    (ignore_dotfiles && name[0] == '.' && name[1] != '/');
+}
+
+size_sum_t entry_size(const char *name, int *isdir) {
   DIR *dir;
   struct dirent *dir_e;
   struct stat dummy;
   size_sum_t result;
-  char subname[BUFFER_SIZE];
+  char subname[PATH_MAX];
 
   result = 0;
+  if(isdir) { *isdir = 0; }
 
   if(lstat(name, &dummy) != 0) {
-    printf("Can not stat %s: %s\n", name, strerror(errno));
-    exit (1);
+    fprintf(stderr,
+            "dus: Can not stat %s: %s\n",
+            name, strerror(errno));
+    if(!(errno == EACCES && dont_exit_on_protected_files)) {
+      exit(EXIT_FAILURE);
+    } else {
+      return 0;
+    }
   }
 
   if(S_ISLNK(dummy.st_mode)) {
     return 0;
   }
 
-  dir = opendir(name);
-
-  if(dir) {
-    while((dir_e = readdir(dir))) {
-      if(strcmp(dir_e->d_name, ".") &&
-         strcmp(dir_e->d_name, "..")) {
-        snprintf(subname, BUFFER_SIZE, "%s/%s", name, dir_e->d_name);
-        result += file_or_dir_size(subname);
+  if(S_ISDIR(dummy.st_mode)) {
+    if(isdir) { *isdir = 1; }
+    dir = opendir(name);
+    if(dir) {
+      while((dir_e = readdir(dir))) {
+        if(!ignore_entry(dir_e->d_name)) {
+          snprintf(subname, PATH_MAX, "%s/%s", name, dir_e->d_name);
+          result += entry_size(subname, 0);
+        }
+      }
+      closedir(dir);
+    } else {
+      fprintf(stderr,
+              "dus: Can not open directory %s: %s\n",
+              name, strerror(errno));
+      if(!(errno == EACCES && dont_exit_on_protected_files)) {
+        exit(EXIT_FAILURE);
       }
     }
-    closedir(dir);
-  } else {
-    if(S_ISREG(dummy.st_mode)) {
-      /* printf("%d %s\n", dummy.st_size, name); */
-      result += dummy.st_size;
-    }
+  } else if(S_ISREG(dummy.st_mode)) {
+    result += dummy.st_size;
   }
 
   return result;
 }
 
+size_sum_t atoss(const char *string) {
+  size_sum_t total, partial_total;
+  const char *c;
+  total = 0;
+  partial_total = 0;
+
+  for(c = string; *c; c++) {
+    if(*c >= '0' && *c <= '9') {
+      partial_total = 10 * partial_total + ((int) (*c - '0'));
+    } else if(*c == 'B' || *c == 'b') {
+      total += partial_total;
+      partial_total = 0;
+    } else if(*c == 'K' || *c == 'k') {
+      total += partial_total * 1024;
+      partial_total = 0;
+    } else if(*c == 'M' || *c == 'm') {
+      total += partial_total * 1024 * 1024;
+      partial_total = 0;
+    } else if(*c == 'G' || *c == 'g') {
+      total += partial_total * 1024 * 1024 * 1024;
+      partial_total = 0;
+    } else {
+      fprintf(stderr,
+              "dus: Syntax error in size specification `%s'\n",
+              string);
+      exit(EXIT_FAILURE);
+    }
+  }
+
+  total += partial_total;
+
+  return total;
+}
+
 /**********************************************************************/
 
-struct file_with_size {
-  char *filename;
+struct entry_node {
+  struct entry_node *next;
+  char *name;
   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));
-  result->filename = strdup(name);
-  result->size = file_or_dir_size(name);
-  result->next = current;
+struct entry_node *push_entry(char *name, struct entry_node *head) {
+  char tmp_name[PATH_MAX];
+  struct entry_node *result;
+  int isdir;
+  result = safe_malloc(sizeof(struct entry_node));
+  result->size = entry_size(name, &isdir);
+  if(isdir) {
+    snprintf(tmp_name, PATH_MAX, "%s/", name);
+    result->name = strdup(tmp_name);
+  } else {
+    result->name = strdup(name);
+  }
+  result->next = head;
   return result;
 }
 
-void destroy(struct file_with_size *node) {
-  struct file_with_size *next;
+struct entry_node *push_dir_content(char *name, struct entry_node *head) {
+  char subname[PATH_MAX];
+  DIR *dir;
+  struct dirent *dir_e;
+  dir = opendir(name);
+  if(dir) {
+    while((dir_e = readdir(dir))) {
+      if(!ignore_entry(dir_e->d_name)) {
+        snprintf(subname, PATH_MAX, "%s/%s", name, dir_e->d_name);
+        head = push_entry(subname, head);
+      }
+    }
+    closedir(dir);
+  } else {
+    fprintf(stderr,
+            "dus: Can not open directory %s: %s\n",
+            name, strerror(errno));
+    exit (EXIT_FAILURE);
+  }
+  return head;
+}
+
+void destroy_entry_list(struct entry_node *node) {
+  struct entry_node *next;
   while(node) {
     next = node->next;
-    free(node->filename);
+    free(node->name);
     free(node);
     node = next;
   }
@@ -107,70 +238,156 @@ void destroy(struct file_with_size *node) {
 /**********************************************************************/
 
 int compare_files(const void *x1, const void *x2) {
-  const struct file_with_size **f1, **f2;
+  const struct entry_node **f1, **f2;
 
-  f1 = (const struct file_with_size **) x1;
-  f2 = (const struct file_with_size **) x2;
+  f1 = (const struct entry_node **) x1;
+  f2 = (const struct entry_node **) 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;
+    }
   }
 }
 
+void raw_print(char *buffer, size_t buffer_size,
+               char *filename,  size_sum_t size) {
+  char *a, *b, *c, u;
+
+  b = buffer;
+  do {
+    if(b >= buffer + buffer_size) {
+      fprintf(stderr,
+              "dus: Buffer overflow in raw_print (hu?!).\n");
+      exit(EXIT_FAILURE);
+    }
+    *(b++) = size%10 + '0';
+    size /= 10;
+  } while(size);
+
+  a = buffer;
+  c = b;
+  while(a < c) {
+    u = *a;
+    *(a++) = *(--c);
+    *c = u;
+  }
+
+  *(b++) = ' ';
 
-void print_sorted(struct file_with_size *root, int height) {
-  struct file_with_size *node;
-  struct file_with_size **nodes;
-  int nb, n, first;
+  snprintf(b, buffer_size - (b - buffer), "%s\n", filename);
+}
 
-  nb = 0;
+void fancy_print(char *buffer, size_t buffer_size,
+                 char *filename, size_sum_t size) {
+  if(size < 1024) {
+    snprintf(buffer,
+             buffer_size,
+             "% 8d %s\n",
+             ((int) size),
+             filename);
+  } else if(size < 1024 * 1024) {
+    snprintf(buffer,
+             buffer_size,
+             "% 7.1fK %s\n",
+             ((double) (size))/(1024.0),
+             filename);
+  } else if(size < 1024 * 1024 * 1024) {
+    snprintf(buffer,
+             buffer_size,
+             "% 7.1fM %s\n",
+             ((double) (size))/(1024.0 * 1024),
+             filename);
+  } else {
+    snprintf(buffer,
+             buffer_size,
+             "% 7.1fG %s\n",
+             ((double) (size))/(1024.0 * 1024.0 * 1024.0),
+             filename);
+  }
+}
+
+void print_sorted(struct entry_node *root, int width, int height) {
+  char line[BUFFER_SIZE];
+  struct entry_node *node;
+  struct entry_node **nodes;
+  int nb_nodes, n, first, last;
+
+  nb_nodes = 0;
   for(node = root; node; node = node->next) {
-    nb++;
+    if(size_min < 0 || node->size >= size_min) {
+      nb_nodes++;
+    }
   }
 
-  nodes = malloc(nb * sizeof(struct file_with_size *));
+  nodes = safe_malloc(nb_nodes * sizeof(struct entry_node *));
 
   n = 0;
   for(node = root; node; node = node->next) {
-    nodes[n++] = node;
+    if(size_min < 0 || node->size >= size_min) {
+      nodes[n++] = node;
+    }
   }
 
-  qsort(nodes, nb, sizeof(struct file_with_size *), compare_files);
+  qsort(nodes, nb_nodes, sizeof(struct entry_node *), compare_files);
+
+  first = 0;
+  last = nb_nodes;
 
-  /*
-  for(n = 0; n < nb; n++) {
-    printf("%lld %s\n",
-           nodes[n]->size,
-           nodes[n]->filename);
+  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);
+  if(forced_width) {
+    width = forced_width;
+  }
+
+  if(height >= 0 && nb_nodes > height && !show_top && !forced_height) {
+    printf("...\n");
+  }
+
+  if(height > 0 && height < nb_nodes) {
+    first = nb_nodes - height;
+  }
+
+  if(show_top) {
+    n = last;
+    last = nb_nodes - first;
+    first = nb_nodes - n;
+  }
+
+  /* I do not like valgrind to complain about uninitialized data */
+  if(width < BUFFER_SIZE) {
+    line[width] = '\0';
+  }
+
+  for(n = first; n < last; n++) {
+    if(fancy_size_display) {
+      fancy_print(line, BUFFER_SIZE, nodes[n]->name, nodes[n]->size);
     } else {
-      printf("% 6.1fG %s\n",
-             ((double) (nodes[n]->size))/(1024.0 * 1024.0 * 1024.0),
-             nodes[n]->filename);
+      raw_print(line, BUFFER_SIZE, nodes[n]->name, nodes[n]->size);
     }
+    if(width >= 1 && width + 1 < BUFFER_SIZE && line[width]) {
+      line[width] = '\n';
+      line[width + 1] = '\0';
+    }
+    printf("%s", line);
+  }
+
+  if(height >= 0 && nb_nodes > height && show_top && !forced_height) {
+    printf("...\n");
   }
 
   free(nodes);
@@ -178,43 +395,135 @@ void print_sorted(struct file_with_size *root, int height) {
 
 /**********************************************************************/
 
+void usage(FILE *out) {
+  fprintf(out, "Usage: dus [OPTION]... [FILE]...\n");
+  fprintf(out, "Version %s (%s)\n", VERSION_NUMBER, UNAME);
+  fprintf(out, "Lists files and directories according to their size. The sizes are computed by summing recursively exact file sizes through directories. If a given directory has its name appended with '/', it is not listed, but the elements it contains are. If no files or directories are provided as arguments, the current directory is used as default.\n");
+  fprintf(out, "\n");
+  /*            01234567890123456789012345678901234567890123456789012345678901234567890123456789*/
+  fprintf(out, "   -h, --help                 show this help.\n");
+  fprintf(out, "   -v, --version              prints the version number and exit\n");
+  fprintf(out, "   -d, --ignore-dots          ignore files and directories starting with a '.'\n");
+  fprintf(out, "   -i, --ignore-protected     do not exit when visiting files and directories\n");
+  fprintf(out, "                              for which we do not have permission\n");
+  fprintf(out, "   -f, --fancy                display size with float values and K, M and G\n");
+  fprintf(out, "                              units.\n");
+  fprintf(out, "   -r, --reverse-order        reverse the sorting order.\n");
+  fprintf(out, "   -t, --show-top             show the top of the list.\n");
+  fprintf(out, "   -c <cols>, --nb-columns <cols>\n");
+  fprintf(out, "                              specificy the number of columns to display. The\n");
+  fprintf(out, "                              value -1 corresponds to no constraint. By default\n");
+  fprintf(out, "                              the command uses the tty width, or no constraint\n");
+  fprintf(out, "                              if the stdout is not a tty.\n");
+  fprintf(out, "   -l <lines>, --nb-lines <lines>\n");
+  fprintf(out, "                              same as -c for number of lines.\n");
+  fprintf(out, "   -m <size>, --size-min <size>\n");
+  fprintf(out, "                              set the listed entries minimum size. The size\n");
+  fprintf(out, "                              can be specified using the G, M, K, and B units.\n");
+  fprintf(out, "\n");
+  fprintf(out, "Report bugs and comments to <francois@fleuret.org>.\n");
+}
+
+/**********************************************************************/
+
+static struct option long_options[] = {
+  { "version", no_argument, 0, 'v' },
+  { "ignore-dots", no_argument, 0, 'd' },
+  { "ignore-protected", no_argument, 0, 'i' },
+  { "reverse-order", no_argument, 0, 'r' },
+  { "show-top", no_argument, 0, 't' },
+  { "help", no_argument, 0, 'h' },
+  { "fancy", no_argument, 0, 'f' },
+  { "nb-columns", 1, 0, 'c' },
+  { "nb-lines", 1, 0, 'l' },
+  { "size-min", 1, 0, 'm' },
+  { 0, 0, 0, 0 }
+};
+
 int main(int argc, char **argv) {
-  int k;
-  struct file_with_size *root;
+  int c, l;
+  struct entry_node *root;
+  struct winsize win;
 
   root = 0;
 
-  if(argc > 1) {
-    for(k = 1; k < argc; k++) {
-      root = create(argv[k], root);
+  setlocale (LC_ALL, "");
+
+  while ((c = getopt_long(argc, argv, "ivdfrtl:c:m:hd",
+                          long_options, NULL)) != -1) {
+    switch (c) {
+
+    case 'v':
+      printf("dus version %s (%s)\n", VERSION_NUMBER, UNAME);
+      exit(EXIT_SUCCESS);
+      break;
+
+    case 'd':
+      ignore_dotfiles = 1;
+      break;
+
+    case 'i':
+      dont_exit_on_protected_files = 1;
+      break;
+
+    case 'f':
+      fancy_size_display = 1;
+      break;
+
+    case 'r':
+      reverse_sorting = 1;
+      break;
+
+    case 't':
+      show_top = 1;
+      break;
+
+    case 'l':
+      forced_height = atoi(optarg);
+      break;
+
+    case 'c':
+      forced_width = atoi(optarg);
+      break;
+
+    case 'm':
+      size_min = atoss(optarg);
+      break;
+
+    case 'h':
+      usage(stdout);
+      exit(EXIT_SUCCESS);
+
+      break;
+
+    default:
+      usage(stderr);
+      exit(EXIT_FAILURE);
     }
-  } 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);
-        }
+  }
+
+  if (optind < argc) {
+    while (optind < argc) {
+      l = strlen(argv[optind]);
+      if(l > 0 && argv[optind][l - 1] == '/') {
+        argv[optind][l - 1] = '\0';
+        root = push_dir_content(argv[optind++], root);
+      } else {
+        root = push_entry(argv[optind++], root);
       }
-      closedir(dir);
     }
+  } else {
+    root = push_dir_content(".", root);
   }
 
-  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);
+  if(isatty(STDOUT_FILENO) &&
+     !ioctl (STDOUT_FILENO, TIOCGWINSZ, (char *) &win)) {
+    print_sorted(root, win.ws_col, win.ws_row - 2);
   } else {
-    print_sorted(root, -1);
+    print_sorted(root, -1, -1);
   }
 
-  destroy(root);
+  destroy_entry_list(root);
 
-  exit(0);
+  exit(EXIT_SUCCESS);
 }