__bitmap_parse(9)
NAME
__bitmap_parse - convert an ASCII hex string into a bitmap.
SYNOPSIS
int __bitmap_parse(const char * buf, unsigned int buflen, int is_user,
unsigned long * maskp, int nmaskbits);
ARGUMENTS
- buf
- pointer to buffer containing string.
- buflen
- buffer size in bytes. If string is smaller than this then it must
be terminated with a \0. - is_user
- location of buffer, 0 indicates kernel space
- 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.