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 \0.
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 accepted, but not embedded whitespace.