unsquashfs: add code to unpack the entire file system

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

2 files changed, 43 insertions, 1 deletions

diff --git a/lib/Makemodule.am b/lib/Makemodule.am
index f23d9b7..691d6df 100644
--- a/lib/Makemodule.am
+++ b/lib/Makemodule.am
@@ -19,7 +19,7 @@ libsquashfs_a_SOURCES += include/frag_reader.h
 
 libutil_a_SOURCES = lib/util/canonicalize_name.c lib/util/write_retry.c
 libutil_a_SOURCES += lib/util/read_retry.c include/util.h
-libutil_a_SOURCES += lib/util/print_version.c
+libutil_a_SOURCES += lib/util/print_version.c lib/util/mkdir_p.c
 
 if WITH_ZLIB
 libcompress_a_SOURCES += lib/comp/zlib.c
diff --git a/lib/util/mkdir_p.c b/lib/util/mkdir_p.c
new file mode 100644
index 0000000..7d1e052
--- /dev/null
+++ b/lib/util/mkdir_p.c
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <alloca.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "util.h"
+
+int mkdir_p(const char *path)
+{
+	size_t i, len;
+	char *buffer;
+
+	while (path[0] == '/' && path[1] == '/')
+		++path;
+
+	if (*path == '\0' || (path[0] == '/' && path[1] == '\0'))
+		return 0;
+
+	len = strlen(path) + 1;
+	buffer = alloca(len);
+
+	for (i = 0; i < len; ++i) {
+		if (i > 0 && (path[i] == '/' || path[i] == '\0')) {
+			buffer[i] = '\0';
+
+			if (mkdir(buffer, 0755) != 0) {
+				if (errno != EEXIST) {
+					fprintf(stderr, "mkdir %s: %s\n",
+						buffer, strerror(errno));
+					return -1;
+				}
+			}
+		}
+
+		buffer[i] = path[i];
+	}
+
+	return 0;
+}