__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); |
bufpointer to buffer containing string.
buflenbuffer size in bytes. If string is smaller than this then it must be terminated with a \0.
is_userlocation of buffer, 0 indicates kernel space
maskppointer to bitmap array that will contain result.
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.