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#ifndef COMMON_C
#define COMMON_C
#ifndef NULL
#define NULL ((void *) 0)
#endif
static inline void
memcpy (void *dst, void *src, unsigned int len)
{
__asm__ __volatile__ ("
cld
rep movsb
" : : "c" (len), "S" (src), "D" (dst));
}
static inline int
memcmp (unsigned char *s1, unsigned char *s2, unsigned int len)
{
register unsigned int reg_ecx;
__asm__ __volatile__ ("
cld
repe cmpsb
je lme
incl %%ecx
lme:
" : "=c" (reg_ecx) : "c" (len), "S" (s1), "D" (s2));
return (reg_ecx);
}
static inline void
memset (void *dst, unsigned char wrbyte, unsigned int len)
{
__asm__ __volatile__ ("
cld
rep stosb
" : : "c" (len), "D" (dst), "a" (wrbyte));
}
static inline int
strcmp (unsigned char *s1, unsigned char *s2)
{
register unsigned int reg_ecx;
__asm__ __volatile__ ("
xorl %%ecx, %%ecx
xorl %%eax, %%eax
pushl %%esi
cld
ls0: lodsb
incl %%ecx
or %%eax, %%eax
jnz ls0
popl %%esi
repe cmpsb
" : "=c" (reg_ecx) : "S" (s1), "D" (s2) : "eax");
return (reg_ecx);
}
static inline int
strlen (unsigned char *s1)
{
register unsigned int reg_ecx;
__asm__ __volatile__ ("
xorl %%eax, %%eax
movl %%eax, %%ecx
decl %%ecx
repne scasb
not %%ecx
decl %%ecx
" : "=c" (reg_ecx) : "D" (s1) : "eax");
return (reg_ecx);
}
#if 0
/* gcc's version is smaller, doh!
*/
static inline int
strstr (unsigned char *s1_hay, unsigned char *s2_needle)
{
register unsigned int reg_ecx;
__asm__ __volatile__ ("
xorl %%ecx, %%ecx
lss_%=: movb (%%esi), %%al
orb %%al, %%al
jz lso_%=
pushl %%esi
pushl %%edi
ls0_%=: cmpsb
jne ls1_%=
cmpb $0x0, (%%edi)
je lse_%=
jmp ls0_%=
ls1_%=: popl %%edi
popl %%esi
incl %%esi
jmp lss_%=
lso_%=: incl %%ecx
lse_%=:
" : "=c" (reg_ecx) : "S" (s1_hay), "D" (s2_needle) : "eax");
}
#endif
static inline void
strcpy (unsigned char *dst, unsigned char *src)
{
memcpy (dst, src, strlen (src) + 1);
}
#endif
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