Xv6 with picoc & Linkage editor: include/dietstring.h Source File

Xv6 with picoc & Linkage editor v1.0

The project delineate mutual cohesion between c library, linkage editor ( linker), interpreter and operating system by porting the same on xv6 kernel

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00001 #ifndef _DIET_STRING_H_
00002 #define _DIET_STRING_H_
00003 
00004 #include <endian.h>
00005 
00006 #if __WORDSIZE == 64
00007 # define MKW(x) (x|x<<8|x<<16|x<<24|x<<32|x<<40|x<<48|x<<56)
00008 # define STRALIGN(x) (((unsigned long)x&7)?8-((unsigned long)x&7):0)
00009 #else /* __WORDSIZE == 32 */
00010 # define MKW(x) (x|x<<8|x<<16|x<<24)
00011 # define STRALIGN(x) (((unsigned long)x&3)?4-((unsigned long)x&3):0)
00012 #endif
00013 
00014 /* GFC(x)    - returns first character */
00015 /* INCSTR(x) - moves to next character */
00016 #if __BYTE_ORDER == __LITTLE_ENDIAN
00017 # define GFC(x) ((x)&0xff)
00018 # define INCSTR(x) do { x >>= 8; } while (0)
00019 #else
00020 # define GFC(x) (((x)>>(sizeof(x)*8-8))&0xff)
00021 # define INCSTR(x) do { x <<= 8; } while (0)
00022 #endif
00023 
00024 #define UNALIGNED(x,y) (((unsigned long)x & (sizeof (unsigned long)-1)) ^ ((unsigned long)y & (sizeof (unsigned long)-1)))
00025 
00026 #endif /* _DIET_STRING_H_ */