libc.obj:

- Formatted by clang-format (WebKit-style).
- Removed unnecessary errno linux. 
- Added KOS error codes. 
- String functions have been replaced with more optimal ones for x86. 
- Changed wrappers for 70 sysfunction.

git-svn-id: svn://kolibrios.org@9765 a494cfbc-eb01-0410-851d-a64ba20cac60

programs/develop/ktcc/trunk/libc.obj/source/string/strncat.c

@@ -1,29 +1,23 @@
-/* strncat( char *, const char *, size_t )
-
-   This file is part of the Public Domain C Library (PDCLib).
-   Permission is granted to use, modify, and / or redistribute at will.
-*/
-
-#include <string.h>
-
-char * strncat( char * s1, const char * s2, size_t n )
-{
-    char * rc = s1;
-
-    while ( *s1 )
-    {
-        ++s1;
-    }
-
-    while ( n && ( *s1++ = *s2++ ) )
-    {
-        --n;
-    }
-
-    if ( n == 0 )
-    {
-        *s1 = '\0';
-    }
-
-    return rc;
+#include <string.h>
+
+char* strncat(char* dst, const char* src, size_t n)
+{
+    int d0, d1, d2, d3;
+    __asm__ __volatile__(
+        "repne\n\t"
+        "scasb\n\t"
+        "decl %1\n\t"
+        "movl %8,%3\n"
+        "1:\tdecl %3\n\t"
+        "js 2f\n\t"
+        "lodsb\n\t"
+        "stosb\n\t"
+        "testb %%al,%%al\n\t"
+        "jne 1b\n"
+        "2:\txorl %2,%2\n\t"
+        "stosb"
+        : "=&S"(d0), "=&D"(d1), "=&a"(d2), "=&c"(d3)
+        : "0"(src), "1"(dst), "2"(0), "3"(0xffffffff), "g"(n)
+        : "memory");
+    return dst;
 }