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