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sys/libkern.h: Add type conversion helpers

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Add helper functions for 32 and 64 bit unsigned to signed integers
conversions.

Reviewed by:
Sponsored by:		Alstom
Obtained from:		Semihalf
Differential revision:	https://reviews.freebsd.org/D33162
This commit is contained in:
Hubert Mazur 2021-11-26 10:20:04 +01:00 committed by Wojciech Macek
parent c3f345ae3c
commit efa5d3831b
1 changed files with 16 additions and 0 deletions
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16
sys/sys/libkern.h
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@ -226,6 +226,22 @@ rindex(const char *p, int ch)
return (strrchr(p, ch));
}
static __inline int64_t
signed_extend64(uint64_t bitmap, int lsb, int width)
{
return ((int64_t)(bitmap << (63 - lsb - (width - 1)))) >>
(63 - (width - 1));
}
static __inline int32_t
signed_extend32(uint32_t bitmap, int lsb, int width)
{
return ((int32_t)(bitmap << (31 - lsb - (width - 1)))) >>
(31 - (width - 1));
}
/* fnmatch() return values. */
#define FNM_NOMATCH 1 /* Match failed. */