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/*
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* Functions interacting with DOS
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*
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* This file is part of the Mateusz' DOS Routines (MDR): http://mdr.osdn.io
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* Published under the terms of the MIT License, as stated below.
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*
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* Copyright (C) 2014-2023 Mateusz Viste
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* 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 DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef MDR_DOS_H
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#define MDR_DOS_H
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#include <time.h> /* time_t */
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/* returns a far pointer to the current process PSP structure */
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void far *mdr_dos_psp(void);
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/* returns a far pointer to the environment block of the current process */
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char far *mdr_dos_env(void);
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/* looks for varname in the DOS environment and fills result with its value if
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* found. returns NULL if not found or if value is too big to fit in result
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* (reslimit exceeded). returns result on success.
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* NOTE: this function performs case-sensitive matches */
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char *mdr_dos_getenv(char *result, const char *varname, unsigned short reslimit);
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/* fetches directory where the program was loaded from and return its length.
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* path string is never longer than 128 (incl. the null terminator) and it is
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* always terminated with a backslash separator, unless it is an empty string */
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unsigned char mdr_dos_exepath(char *path);
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/* returns a far pointer to the full path and filename of the running program.
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* returns NULL on error. */
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const char far *mdr_dos_selfexe(void);
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/* waits for a keypress and returns it
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* extended keys are returned ORed with 0x100 (example: PGUP is 0x149) */
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int mdr_dos_getkey(void);
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/* Same as mdr_dos_getkey(), but this call cannot be aborted by CTRL+C */
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int mdr_dos_getkey2(void);
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/* flush the keyboard buffer */
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void mdr_dos_flushkeyb(void);
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/* poll stdin status, returns 0 if no character is pending in the keyboard
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* buffer, non-zero otherwise */
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int mdr_dos_keypending(void);
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/* disables the CTRL+C handler for the running program - in other words,
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* after this call DOS will no longer abort the program on CTRL+C */
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void mdr_dos_ctrlc_disable(void);
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/* converts a "DOS format" 16-bit packed date into a standard (time_t)
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* unix timestamp. A DOS date is a 16-bit value:
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* YYYYYYYM MMMDDDDD
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*
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* day of month is always within 1-31 range;
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* month is always within 1-12 range;
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* year starts at 1980 and continues for 127 years */
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time_t mdr_dos_date2unix(unsigned short d);
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/* converts a "DOS format" 16-bit packed time into hours, minutes and seconds
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*
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* A DOS time is a 16-bit value:
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* HHHHHMMM MMMSSSSS
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*
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* HHHHH = hours, always within 0-23 range
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* MMMMMM = minutes, always within 0-59 range
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* SSSSS = seconds/2 (always within 0-29 range) */
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void mdr_dos_time2hms(unsigned char *h, unsigned char *m, unsigned char *s, unsigned short t);
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#endif
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