__bitmap_parse

Name:__bitmap_parse - convert an ASCII hex string into a bitmap

Proto:int __bitmap_parse(const char *buf, unsigned int buflen, int is_user, unsigned long *maskp, int nmaskbits)

Type:int

Parameter:

Type	Parameter	Name
const char *	buf
unsigned int	buflen
int	is_user
unsigned long *	maskp
int	nmaskbits

400

chunk = 0

401

ndigits = totaldigits

404

When buflen cycle

405

old_c = c

406

If is_user Then

407

If Get a simple variable from user space, with less checking(c, ubuf++) Then Return -EFAULT

410

Else c = buf++

412

buflen--

413

If Note: isspace() must return false for %NUL-terminator (c) Then Continue

421

If totaldigits && c && Note: isspace() must return false for %NUL-terminator (old_c) Then Return -EINVAL

425

If c == '\0' || c == ',' Then Break

428

If Not isxdigit(c) Then Return -EINVAL

436

If chunk & ~((1UL << Bitmap printing & parsing functions: first version by Nadia Yvette Chambers,* second version by Paul Jackson, third by Joe Korty. - 4 ) - 1) Then Return -EOVERFLOW

439

chunk = chunk << 4 | hex_to_bin(c)

440

totaldigits++

442

If ndigits == totaldigits Then Return -EINVAL

444

If nchunks == 0 && chunk == 0 Then Continue

447

__bitmap_shift_left - logical left shift of the bits in a bitmap*@dst : destination bitmap*@src : source bitmap*@shift : shift by this many bits*@nbits : bitmap size, in bits* Shifting left (multiplying) means moving bits in the LS -> MS* direction

448

maskp |= chunk

449

nchunks++

450

nbits += If nchunks == 1 Then nbits_to_hold_value(chunk) Else Bitmap printing & parsing functions: first version by Nadia Yvette Chambers,* second version by Paul Jackson, third by Joe Korty.

451

If nbits > nmaskbits Then Return -EOVERFLOW

**Caller**
Name	Describe
bitmap_parse_user	map_parse_user - convert an ASCII hex string in a user buffer into a bitmap@ubuf: pointer to user buffer containing string.@ulen: buffer size in bytes. If string is smaller than this* then it must be terminated with a \0.
bitmap_parse

Function report