__BITMAP_PARSE - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Basic Kernel Library Functions

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NAME__bitmap_parse − convert an ASCII hex string into a bitmap​.

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SYNOPSISint __bitmap_parse(const char * buf, unsigned int buflen, int is_user, unsigned long * maskp, int nmaskbits);

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ARGUMENTSbuf 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​.

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DESCRIPTIONCommas 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​.

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