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__BITMAP_PARSE(9) Basic Kernel Library Functions __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.

COPYRIGHT

March 2016 Kernel Hackers Manual 3.2.