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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¶
const char * buf
pointer to buffer containing string.
unsigned int buflen
buffer size in bytes. If string is smaller than this then
it must be terminated with a \0.
int is_user
location of buffer, 0 indicates kernel space
unsigned long * maskp
pointer to bitmap array that will contain result.
int 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¶
| June 2017 | Kernel Hackers Manual 4.11 |