__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
Kernel Hackers Manual 4.8.                 January 2017                         __BITMAP_PARSE(9)