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Code Issues Releases Wiki Activity

util: Add comments.

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This commit is contained in:
Ben Pfaff
2009-09-17 15:12:34 -07:00
parent d0c9d304ff
commit ba25c9d14a
1 changed files with 9 additions and 0 deletions
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9
lib/util.h
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@@ -52,10 +52,19 @@
extern const char *program_name;
/* Returns the number of elements in ARRAY. */
#define ARRAY_SIZE(ARRAY) (sizeof ARRAY / sizeof *ARRAY)
/* Returns X / Y, rounding up. X must be nonnegative to round correctly. */
#define DIV_ROUND_UP(X, Y) (((X) + ((Y) - 1)) / (Y))
/* Returns X rounded up to the nearest multiple of Y. */
#define ROUND_UP(X, Y) (DIV_ROUND_UP(X, Y) * (Y))
/* Returns X rounded down to the nearest multiple of Y. */
#define ROUND_DOWN(X, Y) ((X) / (Y) * (Y))
/* Returns true if X is a power of 2, otherwise false. */
#define IS_POW2(X) ((X) && !((X) & ((X) - 1)))
#ifndef MIN