Util.bitNthMsf

Find the position of the first bit set in @mask, searching from (but not including) @nth_bit downwards. Bits are numbered from 0 (least significant) to sizeof(#gulong) * 8 - 1 (31 or 63, usually). To start searching from the last bit, set @nth_bit to -1 or GLIB_SIZEOF_LONG * 8.

struct Util
static
int
bitNthMsf

Parameters

mask gulong

a #gulong containing flags

nthBit int

the index of the bit to start the search from

Return: the index of the first bit set which is lower than @nth_bit, or -1 if no lower bits are set

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