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/* This file is part of the SvarCOM project and is published under the terms
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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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 * of the MIT license.
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 *
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 *
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 * Copyright (C) 2021 Mateusz Viste
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 * Copyright (C) 2021-2022 Mateusz Viste
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 *
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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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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 * 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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 * 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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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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    xor cx, cx /* file attributes */
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    xor cx, cx /* file attributes */
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    int 0x21
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    int 0x21
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    jnc CLOSEFILE
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    jnc CLOSEFILE
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    mov err, ax
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    mov err, ax
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    jmp DONE
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    jmp DONE
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    /* close file handle */
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    /* close file handle (handle still in BX) */
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    CLOSEFILE:
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    CLOSEFILE:
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    mov ah, 0x3e
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    mov bx, ax
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    mov bx, ax
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    mov ah, 0x3e
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    int 0x21
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    int 0x21
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    DONE:
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    DONE:
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  }
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  }
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  return(err);
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  return(err);
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}
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}
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#include <stdio.h>
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/* parse commandline and performs necessary redirections. cmdline is
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/* parse commandline and performs necessary redirections. cmdline is
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 * modified so all redirections are cut out.
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 * modified so all redirections are cut out.
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 * piped commands are move to awaitingcmd for later execution
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 * piped commands are moved to awaitingcmd for later execution
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 * returns 0 on success, DOS err on failure */
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 * returns 0 on success, DOS err on failure */
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unsigned short redir_parsecmd(struct redir_data *d, char *cmdline, char far *awaitingcmd) {
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unsigned short redir_parsecmd(struct redir_data *d, char *cmdline, char far *awaitingcmd) {
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  unsigned short i;
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  unsigned short i;
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  unsigned short pipescount = 0;
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  unsigned short pipescount = 0;
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/* restores previous stdout handle if is has been redirected */
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/* restores previous stdout handle if is has been redirected */
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void redir_revert(void) {
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void redir_revert(void) {
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  _asm {
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  _asm {
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    /* if oldstdout is 0xffff then not redirected */
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    /* if oldstdout is 0xffff then not redirected */
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    cmp word ptr [oldstdout], 0xffff
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    je DONE
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    /* redirect the stdout handle */
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    mov bx, [oldstdout] /* dst handle */
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    mov bx, [oldstdout] /* dst handle */
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    cmp bx, 0xffff
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    je DONE
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    /* redirect the stdout handle (handle already in BX) */
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    mov cx, 1           /* src handle (1=stdout) */
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    mov cx, 1           /* src handle (1=stdout) */
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    mov ah, 0x46        /* redirect a handle */
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    mov ah, 0x46        /* redirect a handle */
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    int 0x21
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    int 0x21
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    /* close old handle (in bx already) */
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    /* close old handle (in bx already) */
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    mov ah, 0x3e
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    mov ah, 0x3e