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Add abs() macro to return absolute value

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This macro is generally useful to make it available in common.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Acked-by: Tom Rini <trini@ti.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Simon Glass 2012-05-10 11:37:35 +00:00 • committed by Albert ARIBAUD
parent 3ddecfc740
commit a35925b8c1
3 changed files with 25 additions and 7 deletions
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25
include/common.h
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@ -222,6 +222,31 @@ typedef void (interrupt_handler_t)(void *);
#define MIN(x, y) min(x, y)
#define MAX(x, y) max(x, y)
/*
* Return the absolute value of a number.
*
* This handles unsigned and signed longs, ints, shorts and chars. For all
* input types abs() returns a signed long.
*
* For 64-bit types, use abs64()
*/
#define abs(x) ({ \
long ret; \
if (sizeof(x) == sizeof(long)) { \
long __x = (x); \
ret = (__x < 0) ? -__x : __x; \
} else { \
int __x = (x); \
ret = (__x < 0) ? -__x : __x; \
} \
ret; \
})
#define abs64(x) ({ \
s64 __x = (x); \
(__x < 0) ? -__x : __x; \
})
#if defined(CONFIG_ENV_IS_EMBEDDED)
#define TOTAL_MALLOC_LEN CONFIG_SYS_MALLOC_LEN
#elif ( ((CONFIG_ENV_ADDR+CONFIG_ENV_SIZE) < CONFIG_SYS_MONITOR_BASE) || \