__bitmap_parse — convert an ASCII hex string into a bitmap.
|const char * buf,|
|unsigned int buflen,|
|unsigned long * maskp,|
const char * buf
pointer to buffer containing string.
unsigned int buflen
buffer size in bytes. If string is smaller than this then it must be terminated with a \0.
location of buffer, 0 indicates kernel space
unsigned long * maskp
pointer to bitmap array that will contain result.
size of bitmap, in bits.
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.