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-rw-r--r--include/libbb.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/libbb.h b/include/libbb.h
index 7cad12c44..61fa1e03e 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -2127,6 +2127,23 @@ extern const char bb_default_login_shell[] ALIGN1;
# define FB_0 "/dev/fb0"
#endif
+// storage helpers for mk*fs utilities
+char BUG_wrong_field_size(void);
+#define STORE_LE(field, value) \
+do { \
+ if (sizeof(field) == 4) \
+ field = SWAP_LE32((uint32_t)(value)); \
+ else if (sizeof(field) == 2) \
+ field = SWAP_LE16((uint16_t)(value)); \
+ else if (sizeof(field) == 1) \
+ field = (uint8_t)(value); \
+ else \
+ BUG_wrong_field_size(); \
+} while (0)
+
+#define FETCH_LE32(field) \
+ (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size())
+
#define ARRAY_SIZE(x) ((unsigned)(sizeof(x) / sizeof((x)[0])))
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))