kolibrios-gitea/drivers/video/radeonhd/string.c

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C
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#include "common.h"
char * strcat(char *s, const char *append)
{
int d0, d1, d2, d3;
__asm__ __volatile__(
"repne\n\t"
"scasb\n\t"
"decl %1\n"
"1:\tlodsb\n\t"
"stosb\n\t"
"testb %%al,%%al\n\t"
"jne 1b"
: "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)
: "0" (append),"1"(s),"2"(0),"3" (0xffffffff):"memory");
return s;
}
int
memcmp(const void *s1, const void *s2, size_t n)
{
if (n != 0)
{
const unsigned char *p1 = s1, *p2 = s2;
do {
if (*p1++ != *p2++)
return (*--p1 - *--p2);
} while (--n != 0);
}
return 0;
}
void * memcpy(void * _dest, const void *_src, size_t _n)
{
int d0, d1, d2;
__asm__ __volatile__(
"jcxz 1f\n\t"
"rep ; movsl\n\t"
"1:\t"
"testb $2,%b4\n\t"
"je 1f\n\t"
"movsw\n"
"1:\ttestb $1,%b4\n\t"
"je 2f\n\t"
"movsb\n"
"2:"
: "=&c" (d0), "=&D" (d1), "=&S" (d2)
:"0" (_n/4), "q" (_n),"1" ((long)_dest),"2" ((long)_src)
: "memory");
return (_dest);
}
char * strcpy(char *to, const char *from)
{
int d0, d1, d2;
__asm__ __volatile__(
"1:\tlodsb\n\t"
"stosb\n\t"
"testb %%al,%%al\n\t"
"jne 1b"
: "=&S" (d0), "=&D" (d1), "=&a" (d2)
:"0" (from),"1" (to) : "memory");
return to;
}
int strcmp(const char *s1, const char *s2)
{
int d0, d1;
register int __res;
__asm__ __volatile__(
"1:\tlodsb\n\t"
"scasb\n\t"
"jne 2f\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n\t"
"xorl %%eax,%%eax\n\t"
"jmp 3f\n"
"2:\tsbbl %%eax,%%eax\n\t"
"orb $1,%%al\n"
"3:"
:"=a" (__res), "=&S" (d0), "=&D" (d1)
:"1" (s1),"2" (s2));
return __res;
}
size_t strlen(const char *str)
{
int d0;
register int __res;
__asm__ __volatile__(
"repne\n\t"
"scasb\n\t"
"notl %0\n\t"
"decl %0"
:"=c" (__res), "=&D" (d0) :"1" (str),"a" (0), "0" (0xffffffff));
return __res;
}
char * strdup(const char *_s)
{
char *rv;
if (_s == 0)
return 0;
rv = (char *)malloc(strlen(_s) + 1);
if (rv == 0)
return 0;
strcpy(rv, _s);
return rv;
}
char * strchr(const char *s, int c)
{
int d0;
register char * __res;
__asm__ __volatile__(
"movb %%al,%%ah\n"
"1:\tlodsb\n\t"
"cmpb %%ah,%%al\n\t"
"je 2f\n\t"
"testb %%al,%%al\n\t"
"jne 1b\n\t"
"movl $1,%1\n"
"2:\tmovl %1,%0\n\t"
"decl %0"
:"=a" (__res), "=&S" (d0) : "1" (s),"0" (c));
return __res;
}