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/* This file is part of the SvarCOM project and is published under the terms
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 * of the MIT license.
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 *
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 * Copyright (C) 2021-2022 Mateusz Viste
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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 * and/or sell copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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 * DEALINGS IN THE SOFTWARE.
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 */
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#ifndef RMODINIT_H
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#define RMODINIT_H
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#include "helpers.h" /* struct DTA definition */
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#define FLAG_EXEC_AND_QUIT    1
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#define FLAG_PERMANENT        2
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#define FLAG_ECHOFLAG         4
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#define FLAG_ECHO_BEFORE_BAT  8
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#define FLAG_SKIP_AUTOEXEC   16
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#define FLAG_STEPBYSTEP      32
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/* batch context structure used to track what batch file is being executed,
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 * at what line, arguments, whether or not it has a parent batch... */
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struct batctx {
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  char fname[130];            /* truename of batch file being processed */
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  char argv[130];             /* args of the batch call (0-separated) */
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  unsigned char flags;        /* used for step-by-step execution */
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  unsigned long nextline;     /* offset in file of next bat line to process */
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  struct batctx far *parent;  /* parent context if this batch was CALLed */
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};
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/* for context structure used to track the execution of the ongoing FOR loop */
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struct forctx {
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  char cmd[130];              /* copy of the original FOR command */
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  struct DTA dta;             /* DTA for FindNext on current pattern */
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  unsigned short curpat;      /* cmd offset of currently processed pattern */
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  unsigned short nextpat;     /* cmd offset of next pattern to be processed */
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  unsigned short exec;        /* cmd offset of the command to be executed */
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  char varname;               /* single char of variable name */
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  unsigned char dta_inited;   /* 0=requires FindFirst 1=FindNext */
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};
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struct rmod_props {
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  unsigned short rmodseg;     /* segment where rmod is loaded */
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  unsigned long origparent;   /* original parent (far ptr) of the shell */
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  unsigned short origenvseg;  /* original environment segment */
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  unsigned char flags;        /* command line parameters */
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  unsigned char version;      /* used to detect mismatch between rmod and SvarCOM */
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  char awaitingcmd[130];      /* command to exec next time (if any) */
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  struct batctx far *bat;     /* linked list of bat contexts, if BAT ongoing */
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  struct forctx far *forloop; /* a single FOR loop structure, if FOR ongoing */
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};
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#define RMOD_OFFSET_ENVSEG     0x2C   /* stored in rmod's PSP */
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#define RMOD_OFFSET_INPUTBUF   (0x100 + 0x08)
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#define RMOD_OFFSET_COMSPECPTR (0x100 + 0xCE)
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#define RMOD_OFFSET_BOOTDRIVE  (0x100 + 0xD0)
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#define RMOD_OFFSET_LEXITCODE  (0x100 + 0xDF)
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#define RMOD_OFFSET_EXECPARAM  (0x100 + 0xE0)
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#define RMOD_OFFSET_EXECPROG   (0x100 + 0xEE)
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#define RMOD_OFFSET_STDINFILE  (0x100 + 0x16E)
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#define RMOD_OFFSET_STDOUTFILE (0x100 + 0x1EE)
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#define RMOD_OFFSET_STDOUTAPP  (0x100 + 0x26E)
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#define RMOD_OFFSET_STDIN_DEL  (0x100 + 0x270)
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#define RMOD_OFFSET_BRKHANDLER (0x100 + 0x271)
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#define RMOD_OFFSET_ROUTINE    (0x100 + 0x273)
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struct rmod_props far *rmod_install(unsigned short envsize, unsigned char *rmodcore, unsigned short rmodcore_len);
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struct rmod_props far *rmod_find(unsigned short rmodcore_len);
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void rmod_updatecomspecptr(unsigned short rmod_seg, unsigned short env_seg);
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/* allocates bytes of far memory, flags it as belonging to rmod
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 * the new block can be optionally flagged as 'ident' (if not null) and zero
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 * out the newly allocated memory.
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 * returns a far ptr to the allocated block, or NULL on error */
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void far *rmod_fcalloc(unsigned short bytes, unsigned short rmod_seg, char *ident);
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/* free memory previously allocated by rmod_fcalloc() */
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void rmod_ffree(void far *ptr);
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/* free the entire linked list of bat ctx nodes (and set its rmod ptr to NULL) */
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void rmod_free_bat_llist(struct rmod_props far *rmod);
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#endif