unsquashfs: print file size and symlink targets

Behave somewhat like `ls -l' does by printing the size of the
entry (or major/minor device number for devices) between the UID/GID
column and the name column.

For symlinks, print and arrow and the symlink target after the name.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 69 insertions, 6 deletions

diff --git a/unpack/list_files.c b/unpack/list_files.c
index aaf0652..86bc185 100644
--- a/unpack/list_files.c
+++ b/unpack/list_files.c
@@ -1,6 +1,8 @@
 /* SPDX-License-Identifier: GPL-3.0-or-later */
 #include "unsquashfs.h"
 
+#include <sys/sysmacros.h>
+
 static void mode_to_str(uint16_t mode, char *p)
 {
 	switch (mode & S_IFMT) {
@@ -59,10 +61,51 @@ static int count_int_chars(unsigned int i)
 	return count;
 }
 
+static void print_size(uint64_t size, char *buffer)
+{
+	static const char *suffices = "kMGTPEZY";
+	int suffix = -1;
+
+	while (size > 1024) {
+		++suffix;
+		size /= 1024;
+	}
+
+	if (suffix >= 0) {
+		sprintf(buffer, "%u%c", (unsigned int)size, suffices[suffix]);
+	} else {
+		sprintf(buffer, "%u", (unsigned int)size);
+	}
+}
+
+static void print_node_size(tree_node_t *n, char *buffer)
+{
+	switch (n->mode & S_IFMT) {
+	case S_IFLNK:
+		print_size(strlen(n->data.slink_target), buffer);
+		break;
+	case S_IFREG:
+		print_size(n->data.file->size, buffer);
+		break;
+	case S_IFDIR:
+		print_size(n->data.dir->size, buffer);
+		break;
+	case S_IFBLK:
+	case S_IFCHR:
+		sprintf(buffer, "%u:%u", major(n->data.devno),
+			minor(n->data.devno));
+		break;
+	default:
+		buffer[0] = '0';
+		buffer[1] = '\0';
+		break;
+	}
+}
+
 void list_files(tree_node_t *node)
 {
-	int i, max_uid_chars = 0, max_gid_chars = 0;
-	char modestr[12];
+	int i, max_uid_chars = 0, max_gid_chars = 0, max_sz_chars = 0;
+	char modestr[12], sizestr[32];
 	tree_node_t *n;
 
 	if (S_ISDIR(node->mode)) {
@@ -72,19 +115,39 @@ void list_files(tree_node_t *node)
 
 			i = count_int_chars(n->gid);
 			max_gid_chars = i > max_gid_chars ? i : max_gid_chars;
+
+			print_node_size(n, sizestr);
+			i = strlen(sizestr);
+			max_sz_chars = i > max_sz_chars ? i : max_sz_chars;
 		}
 
 		for (n = node->data.dir->children; n != NULL; n = n->next) {
 			mode_to_str(n->mode, modestr);
+			print_node_size(n, sizestr);
 
-			printf("%s %*u/%-*u %s\n", modestr,
+			printf("%s %*u/%-*u %*s %s", modestr,
 			       max_uid_chars, n->uid,
-			       max_gid_chars, n->gid, n->name);
+			       max_gid_chars, n->gid,
+			       max_sz_chars, sizestr,
+			       n->name);
+
+			if (S_ISLNK(n->mode)) {
+				printf(" -> %s\n", n->data.slink_target);
+			} else {
+				fputc('\n', stdout);
+			}
 		}
 	} else {
 		mode_to_str(node->mode, modestr);
+		print_node_size(node, sizestr);
 
-		printf("%s %u/%u %s\n", modestr,
-		       node->uid, node->gid, node->name);
+		printf("%s %u/%u %s %s", modestr,
+		       node->uid, node->gid, sizestr, node->name);
+
+		if (S_ISLNK(node->mode)) {
+			printf(" -> %s\n", node->data.slink_target);
+		} else {
+			fputc('\n', stdout);
+		}
 	}
 }