musl/include/sys/sysmacros.h

#ifndef _SYS_SYSMACROS_H
#define _SYS_SYSMACROS_H

#define major(x) \
	((unsigned)( (((x)>>31>>1) & 0xfffff000) | (((x)>>8) & 0x00000fff) ))
#define minor(x) \
	((unsigned)( (((x)>>12) & 0xffffff00) | ((x) & 0x000000ff) ))

#define makedev(x,y) ( \
        (((x)&0xfffff000ULL) << 32) | \
	(((x)&0x00000fffULL) << 8) | \
        (((y)&0xffffff00ULL) << 12) | \
	(((y)&0x000000ffULL)) )

#endif
header file fixes: multiple include guard consistency and correctness one file was reusing another file's macro name, and many had inconsistent underscores and application of SYS prefix, etc. patch by Szabolcs Nagy (nsz) 2012-06-15 21:52:53 -04:00			`#ifndef _SYS_SYSMACROS_H`
			`#define _SYS_SYSMACROS_H`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00
support full range of dev_t major/minor numbers in makedev, etc. macros 2013-05-15 16:15:50 -04:00			`#define major(x) \`
fix shifts possibly larger than type in major() macro in theory this should not be an issue, since major() should only be applied to type dev_t, which is 64-bit. however, it appears some applications are not using dev_t but a smaller integer type (which works on Linux because the kernel's dev_t is really only 32-bit). to avoid the undefined behavior, do it as two shifts. 2013-06-29 13:57:13 -04:00			`((unsigned)( (((x)>>31>>1) & 0xfffff000) \| (((x)>>8) & 0x00000fff) ))`
support full range of dev_t major/minor numbers in makedev, etc. macros 2013-05-15 16:15:50 -04:00			`#define minor(x) \`
			`((unsigned)( (((x)>>12) & 0xffffff00) \| ((x) & 0x000000ff) ))`

			`#define makedev(x,y) ( \`
			`(((x)&0xfffff000ULL) << 32) \| \`
			`(((x)&0x00000fffULL) << 8) \| \`
			`(((y)&0xffffff00ULL) << 12) \| \`
			`(((y)&0x000000ffULL)) )`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00
			`#endif`