From a35925b8c10c99a7020bfcda74c8a6c72ed90cf5 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 10 May 2012 11:37:35 +0000 Subject: Add abs() macro to return absolute value This macro is generally useful to make it available in common. Signed-off-by: Simon Glass Signed-off-by: Tom Warren Acked-by: Tom Rini Acked-by: Mike Frysinger --- include/common.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'include') diff --git a/include/common.h b/include/common.h index 4b5841ef47..ff7126d35d 100644 --- a/include/common.h +++ b/include/common.h @@ -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) || \ -- cgit v1.2.1