1 files changed, 163 insertions, 0 deletions
diff --git a/libc/msdos/i86.c b/libc/msdos/i86.c
new file mode 100644
index 0000000..0613756
--- /dev/null
+++ b/libc/msdos/i86.c
@@ -0,0 +1,163 @@
+/* Copyright (C) 1995,1996 Robert de Bath <rdebath@cix.compulink.co.uk>
+ * This file is part of the Linux-8086 C library and is distributed
+ * under the GNU Library General Public License.
+ */
+/*
+ * These functions will not normally be useful for Linux-8086. But they
+ * can be used and may be useful in the kernel.
+ */
+
+#ifdef __AS386_16__
+
+#ifdef L___set_es
+unsigned int
+__get_ds()
+{
+#asm
+   mov	ax,ds
+#endasm
+}
+
+unsigned int
+__get_es()
+{
+#asm
+   mov	ax,es
+#endasm
+}
+
+void
+__set_es(seg)
+{
+#asm
+#if __FIRST_ARG_IN_AX__
+   mov	es,ax
+#else
+   mov	bx,sp
+   mov	es,[bx+2]
+#endif
+#endasm
+}
+#endif
+
+#ifdef L___peek_es
+int
+__peek_es(off)
+unsigned int off;
+{
+#asm
+#if __FIRST_ARG_IN_AX__
+  mov	bx,ax
+#else
+  mov	bx,sp
+  mov	bx,[bx+2]
+#endif
+  seg	es
+  mov	al,[bx]
+  xor	ah,ah
+#endasm
+}
+#endif
+
+#ifdef L___poke_es
+int
+__poke_es(off, value)
+unsigned int off;
+int value;
+{
+#asm
+#if __FIRST_ARG_IN_AX__
+  mov	bx,sp
+  mov	bx,[bx+2]
+  xchg	ax,bx
+#else
+  mov	bx,sp
+  mov	ax,[bx+4]
+  mov	bx,[bx+2]
+#endif
+  seg	es
+  mov	[bx],al
+  xor	ah,ah
+#endasm
+}
+#endif
+
+#ifdef L___deek_es
+int
+__deek_es(off)
+unsigned int off;
+{
+#asm
+#if __FIRST_ARG_IN_AX__
+  mov	bx,ax
+#else
+  mov	bx,sp
+  mov	bx,[bx+2]
+#endif
+  seg	es
+  mov	ax,[bx]
+#endasm
+}
+#endif
+
+#ifdef L___strchr_es
+char *
+__strchr_es(s, c)
+char * s;
+int c;
+{
+#asm
+  mov	bx,sp
+  push	si
+#if __FIRST_ARG_IN_AX__
+  mov	bx,[bx+2]
+  mov	si,ax
+#else
+  mov	si,[bx+2]
+  mov	bx,[bx+4]
+#endif
+  xor	ax,ax
+
+#ifdef PARANOID
+  cld
+#endif
+  push	ds
+  push	es
+  pop	ds
+
+in_loop:
+  lodsb
+  cmp	al,bl
+  jz	got_it
+  or	al,al
+  jnz	in_loop
+  pop	ds
+  pop	si
+  ret
+got_it:
+  lea	ax,[si-1]
+  pop	ds
+  pop	si
+
+#endasm
+}
+#endif
+
+#ifdef L___strchr_es
+char *
+__strnget_es(d, s, c)
+char *d, *s;
+int c;
+{
+   int ds, es;
+   char *p = __strchr_es(s, '\0');
+   if(p != 0 && p-s < c) 
+      c = p-s+1;
+   ds = __get_ds();
+   es = __get_es();
+
+   __movedata(es, s, ds, d, c);
+}
+#endif
+
+#endif /* __AS386_16__ */