archival: added O_TRUNC so that when we overwrite files on unpack,
we truncate them. Also spotted & fixed hard to trigger bug
with extension handling.
diff --git a/archival/bunzip2.c b/archival/bunzip2.c
index a970aeb..9810e02 100644
--- a/archival/bunzip2.c
+++ b/archival/bunzip2.c
@@ -41,17 +41,20 @@
if (filename) {
struct stat stat_buf;
- char *extension=filename+strlen(filename)-4;
- if (strcmp(extension, ".bz2") != 0) {
+ /* extension = filename+strlen(filename)-4 is buggy:
+ * strlen may be less than 4 */
+ char *extension = strrchr(filename, '.');
+ if (!extension || strcmp(extension, ".bz2") != 0) {
bb_error_msg_and_die("Invalid extension");
}
xstat(filename, &stat_buf);
- *extension=0;
- dst_fd = xopen3(filename, O_WRONLY | O_CREAT, stat_buf.st_mode);
+ *extension = '\0';
+ dst_fd = xopen3(filename, O_WRONLY | O_CREAT | O_TRUNC,
+ stat_buf.st_mode);
} else dst_fd = STDOUT_FILENO;
status = uncompressStream(src_fd, dst_fd);
if(filename) {
- if (!status) filename[strlen(filename)]='.';
+ if (!status) filename[strlen(filename)] = '.';
if (unlink(filename) < 0) {
bb_error_msg_and_die("Couldn't remove %s", filename);
}
diff --git a/archival/gunzip.c b/archival/gunzip.c
index 3a1d1cb..7be94e1 100644
--- a/archival/gunzip.c
+++ b/archival/gunzip.c
@@ -98,7 +98,8 @@
}
/* Open output file (with correct permissions) */
- dst_fd = xopen3(new_path, O_WRONLY | O_CREAT, stat_buf.st_mode);
+ dst_fd = xopen3(new_path, O_WRONLY | O_CREAT | O_TRUNC,
+ stat_buf.st_mode);
/* If unzip succeeds remove the old file */
delete_path = old_path;
diff --git a/archival/uncompress.c b/archival/uncompress.c
index ca775c7..8c466eb 100644
--- a/archival/uncompress.c
+++ b/archival/uncompress.c
@@ -55,7 +55,8 @@
/* Open output file */
xstat(compressed_file, &stat_buf);
- dst_fd = xopen3(uncompressed_file, O_WRONLY | O_CREAT,
+ dst_fd = xopen3(uncompressed_file,
+ O_WRONLY | O_CREAT | O_TRUNC,
stat_buf.st_mode);
/* If unzip succeeds remove the old file */
diff --git a/archival/unlzma.c b/archival/unlzma.c
index fbd207c..00acea6 100644
--- a/archival/unlzma.c
+++ b/archival/unlzma.c
@@ -37,14 +37,15 @@
if (filename) {
struct stat stat_buf;
- char *extension = filename + strlen(filename) - 5;
-
- if (strcmp(extension, ".lzma") != 0) {
+ /* bug: char *extension = filename + strlen(filename) - 5; */
+ char *extension = strrchr(filename, '.');
+ if (!extension || strcmp(extension, ".lzma") != 0) {
bb_error_msg_and_die("Invalid extension");
}
xstat(filename, &stat_buf);
- *extension = 0;
- dst_fd = xopen3(filename, O_WRONLY | O_CREAT, stat_buf.st_mode);
+ *extension = '\0';
+ dst_fd = xopen3(filename, O_WRONLY | O_CREAT | O_TRUNC,
+ stat_buf.st_mode);
} else
dst_fd = STDOUT_FILENO;
status = unlzma(src_fd, dst_fd);
diff --git a/archival/unzip.c b/archival/unzip.c
index 6dd1d35..709ebf8 100644
--- a/archival/unzip.c
+++ b/archival/unzip.c
@@ -333,7 +333,7 @@
overwrite = o_always;
case 'y': /* Open file and fall into unzip */
unzip_create_leading_dirs(dst_fn);
- dst_fd = xopen3(dst_fn, O_WRONLY | O_CREAT, 0777);
+ dst_fd = xopen3(dst_fn, O_WRONLY | O_CREAT | O_TRUNC, 0777);
case -1: /* Unzip */
if (verbosity == v_normal) {
printf(" inflating: %s\n", dst_fn);