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move storage helpers to libbb.h

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2018-09-28 15:13:04 +02:00
parent aae428f0bf
commit abfa3ec059
5 changed files with 17 additions and 63 deletions
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17
include/libbb.h
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@@ -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)]))