7 #define ROUND_UP(X, STEP) (((X) + (STEP) - 1) / (STEP) * (STEP))
8 #define DIV_ROUND_UP(X, STEP) (((X) + (STEP) - 1) / (STEP))
9 #define ROUND_DOWN(X, STEP) ((X) / (STEP) * (STEP))
11 void *memset (void *, int, size_t);
12 void *memcpy (void *, const void *, size_t);
13 void *memmove (void *, const void *, size_t);
14 void *memchr (const void *, int, size_t);
15 int memcmp (const void *, const void *, size_t);
17 char *strchr (const char *, int);
18 size_t strlcpy (char *, const char *, size_t);
19 size_t strlen (const char *);
21 void vprintk (const char *, va_list);
22 void printk (const char *, ...)
23 __attribute__ ((format (printf, 1, 2)));
28 return c >= '0' && c <= '9';