Add a header for platform compatibillity fluff

 - We don't have "endian.h" everywhere. On some BSDs its in sys and
   on some BSDs the macros have different names.
 - We definitely don't have sysmacros.h on non-Unix-like systems.
 - Likewise for sys/types.h, sys/stat.h and their contents.

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

6 files changed, 99 insertions, 7 deletions

diff --git a/include/compat.h b/include/compat.h
new file mode 100644
index 0000000..74d0b6f
--- /dev/null
+++ b/include/compat.h
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * util.h
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#ifndef COMPAT_H
+#define COMPAT_H
+
+#if defined(__APPLE__)
+#include <libkern/OSByteOrder.h>
+
+#define htole16(x) OSSwapHostToLittleInt16(x)
+#define htole32(x) OSSwapHostToLittleInt32(x)
+#define htole64(x) OSSwapHostToLittleInt64(x)
+
+#define le32toh(x) OSSwapLittleToHostInt32(x)
+#define le16toh(x) OSSwapLittleToHostInt16(x)
+#define le64toh(x) OSSwapLittleToHostInt64(x)
+#elif defined(__OpenBSD__)
+#include <sys/endian.h>
+#elif defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
+#include <sys/endian.h>
+
+#define le16toh(x) letoh16(x)
+#define le32toh(x) letoh32(x)
+#define le64toh(x) letoh64(x)
+#elif defined(_WIN32) || defined(__WINDOWS__)
+#define htole16(x) (x)
+#define htole32(x) (x)
+#define htole64(x) (x)
+
+#define le16toh(x) (x)
+#define le32toh(x) (x)
+#define le64toh(x) (x)
+#else
+#include <endian.h>
+#endif
+
+#if defined(_WIN32) || defined(__WINDOWS__)
+#define S_IFSOCK SQFS_INODE_MODE_SOCK
+#define S_IFLNK SQFS_INODE_MODE_LNK
+#define S_IFREG SQFS_INODE_MODE_REG
+#define S_IFBLK SQFS_INODE_MODE_BLK
+#define S_IFDIR SQFS_INODE_MODE_DIR
+#define S_IFCHR SQFS_INODE_MODE_CHR
+#define S_IFIFO SQFS_INODE_MODE_FIFO
+#define S_IFMT SQFS_INODE_MODE_MASK
+
+#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
+#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#define S_ISCHR(m) (((m) & S_IFMT) == S_IFCHR)
+#define S_ISBLK(m) (((m) & S_IFMT) == S_IFBLK)
+#define S_ISFIFO(m) (((m) & S_IFMT) == S_IFIFO)
+#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
+#define S_ISSOCK(m) (((m) & S_IFMT) == S_IFSOCK)
+
+#define S_ISUID SQFS_INODE_SET_UID
+#define S_ISGID SQFS_INODE_SET_GID
+#define S_ISVTX SQFS_INODE_STICKY
+
+#define S_IRWXU SQFS_INODE_OWNER_MASK
+#define S_IRUSR SQFS_INODE_OWNER_R
+#define S_IWUSR SQFS_INODE_OWNER_W
+#define S_IXUSR SQFS_INODE_OWNER_X
+
+#define S_IRWXG SQFS_INODE_GROUP_MASK
+#define S_IRGRP SQFS_INODE_GROUP_R
+#define S_IWGRP SQFS_INODE_GROUP_W
+#define S_IXGRP SQFS_INODE_GROUP_X
+
+#define S_IRWXO SQFS_INODE_OTHERS_MASK
+#define S_IROTH SQFS_INODE_OTHERS_R
+#define S_IWOTH SQFS_INODE_OTHERS_W
+#define S_IXOTH SQFS_INODE_OTHERS_X
+
+/* lifted from musl libc */
+#define major(x) \
+	((unsigned)( (((x)>>31>>1) & 0xfffff000) | (((x)>>8) & 0x00000fff) ))
+
+#define minor(x)							\
+	((unsigned)( (((x)>>12) & 0xffffff00) | ((x) & 0x000000ff) ))
+
+#define makedev(x,y) ( \
+        (((x)&0xfffff000ULL) << 32) | \
+	(((x)&0x00000fffULL) << 8) | \
+        (((y)&0xffffff00ULL) << 12) | \
+	(((y)&0x000000ffULL)) )
+#else
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#endif
+
+#endif /* COMPAT_H */
diff --git a/include/fstree.h b/include/fstree.h
index dbd2cd6..337b598 100644
--- a/include/fstree.h
+++ b/include/fstree.h
@@ -9,14 +9,13 @@
 
 #include "config.h"
 
-#include <sys/types.h>
-#include <sys/stat.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <stddef.h>
 #include <stdio.h>
 
 #include "str_table.h"
+#include "compat.h"
 
 #define FSTREE_XATTR_KEY_BUCKETS 31
 #define FSTREE_XATTR_VALUE_BUCKETS 511
diff --git a/include/highlevel.h b/include/highlevel.h
index 13c85a7..6e4ad5e 100644
--- a/include/highlevel.h
+++ b/include/highlevel.h
@@ -22,12 +22,11 @@
 #include "sqfs/xattr.h"
 #include "sqfs/dir.h"
 #include "sqfs/io.h"
+#include "compat.h"
 #include "fstree.h"
 #include "util.h"
 #include "tar.h"
 
-#include <sys/stat.h>
-#include <stdint.h>
 #include <stddef.h>
 
 typedef struct {
diff --git a/include/sqfs/predef.h b/include/sqfs/predef.h
index 2e835f3..13e49f3 100644
--- a/include/sqfs/predef.h
+++ b/include/sqfs/predef.h
@@ -27,7 +27,6 @@
  *        macros and integer types.
  */
 
-#include <sys/types.h>
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
diff --git a/include/tar.h b/include/tar.h
index d4e72ec..d0a483c 100644
--- a/include/tar.h
+++ b/include/tar.h
@@ -10,7 +10,6 @@
 #include "config.h"
 #include "util.h"
 
-#include <sys/stat.h>
 #include <stdbool.h>
 #include <stdint.h>
 
diff --git a/include/util.h b/include/util.h
index 61754ed..e7bc431 100644
--- a/include/util.h
+++ b/include/util.h
@@ -10,10 +10,11 @@
 #include "config.h"
 #include "sqfs/predef.h"
 
-#include <sys/types.h>
 #include <stdint.h>
 #include <stddef.h>
 
+#include "compat.h"
+
 #if defined(__GNUC__) || defined(__clang__)
 #define UI_ADD_OV __builtin_uadd_overflow
 #define UL_ADD_OV __builtin_uaddl_overflow