cbfstool: Make endian detection functions to work without prior setup.

The 'host_bigendian' variable (and functions relying on it like ntohl/htonl)
requires host detection by calling static which_endian() first -- which may be
easily forgotten by developers.  It's now a public function in common.c and
doesn't need initialization anymore.

Change-Id: I13dabd1ad15d2d6657137d29138e0878040cb205
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: http://review.coreboot.org/2199
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

4 files changed, 21 insertions, 19 deletions

diff --git a/util/cbfstool/cbfs-mkstage.c b/util/cbfstool/cbfs-mkstage.c
index ef5182aae3..4374bdadf5 100644
--- a/util/cbfstool/cbfs-mkstage.c
+++ b/util/cbfstool/cbfs-mkstage.c
@@ -77,7 +77,7 @@ int parse_elf_to_stage(unsigned char *input, unsigned char **output,
 	if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) {
 		elf_bigendian = 1;
 	}
-	if (elf_bigendian != host_bigendian) {
+	if (elf_bigendian != is_big_endian()) {
 		elf32_to_native = swap32;
 	}
 
diff --git a/util/cbfstool/cbfstool.c b/util/cbfstool/cbfstool.c
index 1ad270b057..11f1914e2e 100644
--- a/util/cbfstool/cbfstool.c
+++ b/util/cbfstool/cbfstool.c
@@ -496,18 +496,6 @@ static void usage(char *name)
 	print_supported_filetypes();
 }
 
-/* Small, OS/libc independent runtime check for endianess */
-int host_bigendian = 0;
-
-static void which_endian(void)
-{
-	static const uint32_t inttest = 0x12345678;
-	uint8_t inttest_lsb = *(uint8_t *)&inttest;
-	if (inttest_lsb == 0x12) {
-		host_bigendian = 1;
-	}
-}
-
 int main(int argc, char **argv)
 {
 	size_t i;
@@ -518,8 +506,6 @@ int main(int argc, char **argv)
 		return 1;
 	}
 
-	which_endian();
-
 	param.cbfs_name = argv[1];
 	char *cmd = argv[2];
 	optind += 2;
diff --git a/util/cbfstool/common.c b/util/cbfstool/common.c
index 3394b7b536..d4560f691f 100644
--- a/util/cbfstool/common.c
+++ b/util/cbfstool/common.c
@@ -27,6 +27,19 @@
 #include "cbfs.h"
 #include "elf.h"
 
+/* Utilities */
+
+/* Small, OS/libc independent runtime check for endianess */
+int is_big_endian(void)
+{
+	static const uint32_t inttest = 0x12345678;
+	uint8_t inttest_lsb = *(uint8_t *)&inttest;
+	if (inttest_lsb == 0x12) {
+		return 1;
+	}
+	return 0;
+}
+
 size_t getfilesize(const char *filename)
 {
 	size_t size;
diff --git a/util/cbfstool/common.h b/util/cbfstool/common.h
index bd5ef65f16..5315e69bed 100644
--- a/util/cbfstool/common.h
+++ b/util/cbfstool/common.h
@@ -21,13 +21,16 @@
 #define __CBFSTOOL_COMMON_H
 
 #include <stdint.h>
+
+/* Endianess */
 #include "swab.h"
 #ifndef __APPLE__
-#define ntohl(x)  (host_bigendian?(x):swab32(x))
-#define htonl(x)  (host_bigendian?(x):swab32(x))
+#define ntohl(x)	(is_big_endian() ? (x) : swab32(x))
+#define htonl(x)	(is_big_endian() ? (x) : swab32(x))
 #endif
-#define ntohll(x) (host_bigendian?(x):swab64(x))
-#define htonll(x) (host_bigendian?(x):swab64(x))
+#define ntohll(x)	(is_big_endian() ? (x) : swab64(x))
+#define htonll(x)	(is_big_endian() ? (x) : swab64(x))
+extern int is_big_endian(void);
 
 /* Message output */
 extern int verbose;