__bitmap_parse — convert an ASCII hex string into a bitmap.
int __bitmap_parse ( | const char * buf, |
| unsigned int buflen, | |
| int is_user, | |
| unsigned long * maskp, | |
int nmaskbits); |
const char * bufpointer to buffer containing string.
unsigned int buflenbuffer size in bytes. If string is smaller than this then it must be terminated with a \0.
int is_userlocation of buffer, 0 indicates kernel space
unsigned long * maskppointer to bitmap array that will contain result.
int nmaskbitssize 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.