bitmap_parse(9)
NAME
bitmap_parse - convert an ASCII hex string into a bitmap.
SYNOPSIS
int bitmap_parse(const char __user * ubuf, unsigned int ubuflen, unsigned long * maskp, int nmaskbits);
ARGUMENTS
- ubuf
- pointer to buffer in user space containing string.
- ubuflen
- buffer size in bytes. If string is smaller than this
- then it must be terminated with a .
- maskp
- pointer to bitmap array that will contain result.
- nmaskbits
- size of bitmap, in bits.
DESCRIPTION
- Commas group hex digits into chunks. Each chunk defines
- exactly 32 bits of the resultant bitmask. No chunk may specify a
- value larger than 32 bits (-EOVERFLOW), and if a chunk specifies
- a smaller value then leading 0-bits are prepended. -EINVAL is
- returned for illegal characters and for grouping errors such as
- "1,,5", ",44", "," and "". Leading and trailing whitespace ac
- cepted, but not embedded whitespace.