1 files changed, 81 insertions, 0 deletions

diff --git a/v4.0/src/CMD/FDISK/DOS.H b/v4.0/src/CMD/FDISK/DOS.H
new file mode 100644
index 0000000..6d622b6
--- /dev/null
+++ b/v4.0/src/CMD/FDISK/DOS.H
@@ -0,0 +1,81 @@
+/* dos.h
+ *
+ * Defines the structs and unions used to handle the input and output
+ * registers for the DOS interface routines defined in the V2.0 to V3.0
+ * compatability package.  It also includes macros to access the segment
+ * and offset values of MS C "far" pointers, so that they may be used by
+ * these routines.
+ *
+ */
+
+/* word registers */
+
+struct WORDREGS {
+        unsigned ax;
+        unsigned bx;
+        unsigned cx;
+        unsigned dx;
+        unsigned si;
+        unsigned di;
+        unsigned cflag;
+        };
+
+/* byte registers */
+
+struct BYTEREGS {
+        unsigned char al, ah;
+        unsigned char bl, bh;
+        unsigned char cl, ch;
+        unsigned char dl, dh;
+        };
+
+/* general purpose registers union - overlays the corresponding word and
+ * byte registers.
+ */
+
+union REGS {
+        struct WORDREGS x;
+        struct BYTEREGS h;
+        };
+
+/* segment registers */
+
+struct SREGS {
+        unsigned es;
+        unsigned cs;
+        unsigned ss;
+        unsigned ds;
+        };
+
+/* dosexterror struct */
+
+struct DOSERROR {
+        int exterror;
+        char class;
+        char action;
+        char locus;
+        };
+
+/* macros to break MS C "far" pointers into their segment and offset
+ * components
+ */
+
+#define FP_SEG(fp) (*((unsigned *)&(fp) + 1))
+#define FP_OFF(fp) (*((unsigned *)&(fp)))
+
+/* function declarations for those who want strong type checking
+ * on arguments to library function calls
+ */
+
+#ifdef LINT_ARGS                /* arg. checking enabled */
+
+int bdos(int, unsigned int, unsigned int);
+int dosexterr(struct DOSERROR *);
+int intdos(union REGS *, union REGS *);
+int intdosx(union REGS *, union REGS *, struct SREGS *);
+int int86(int, union REGS *, union REGS *);
+int int86x(int, union REGS *, union REGS *, struct SREGS *);
+void segread(struct SREGS *);
+
+#endif  /* LINT_ARGS */
+
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