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- /*
- The BDS C Standard I/O header file -- v1.41 October 14, 1980
-
- This file contains global definitions, for use in all C programs
- in PLACE of (yechhh) CONSTANTS. Characteristics of your system such
- as video screen size, interface port numbers and masks, buffered I/O
- allocations, etc., should all be configured just once within this
- file. Any program which needs them should contain the preprocessor
- directive:
-
- #include "bdscio.h"
-
- near the beginning.
- Go through and set all this stuff as soon as you get the package,
- and most terminal-dependent sample programs should run much better.
- Some games (such as STONE.C and RALLY.C), which were contributed and
- beyond the scope of my ablity (or patience) to generalize, may not
- bother to use the globals from this file, alas.
-
- */
-
-
- /******* Some console (video) terminal characteristics: *******/
-
- #define TWIDTH 80 /* # of columns */
- #define TLENGTH 24 /* # of lines */
-
- #define CSTAT 0 /* Console status port */
- #define CDATA 1 /* Console data port */
- #define CIMASK 0x40 /* Console input data ready mask */
- #define COMASK 0x80 /* Console output data ready mask */
- #define CAHI 1 /* True if console status active high */
- #define CRESET 0 /* True if status port needs to be reset */
- #define CRESETVAL 0 /* If CRESET is true, this is the value to send */
-
- #define CLEARS "\033E" /* String to clear screen on console */
- #define INTOREV "\033p" /* String to switch console into reverse video */
- #define OUTAREV "\033q" /* String to switch console OUT of reverse video */
- #define CURSOROFF "\033x5" /* String to turn cursor off */
- #define CURSORON "\033y5" /* String to turn cursor on */
-
- #define ESC '\033' /* Standard ASCII 'escape' character */
-
-
- /***** Modem characteristics: *****/
-
- #define MSTAT 2 /* Modem status port */
- #define MDATA 3 /* Modem data port */
- #define MIMASK 0x40 /* Modem input data ready mask */
- #define MOMASK 0x80 /* Modem ready to send a character mask */
- #define MAHI 1 /* True if modem status logic active high */
- #define MRESET 0 /* True if modem status port needs to be reset */
- #define MRESETVAL 0 /* If MRESET true, this is the byte to send */
-
-
- /****** General purpose Symbolic constants: *********/
-
- #define BASE 0 /* Base of CP/M system RAM (0 or 0x4200) */
- #define NULL 0 /* Used by some functions to indicate zilch */
- #define EOF -1 /* Physical EOF returned by low level I/O functions */
- #define ERROR -1 /* General "on error" return value */
- #define OK 0 /* General purpose "no error" return value */
- #define CPMEOF 0x1a /* CP/M End-of-text-file marker (sometimes!) */
- #define SECSIZ 128 /* Sector size for CP/M read/write calls */
- #define MAXLINE 135 /* Longest line of input expected from the console */
- #define TRUE 1 /* general purpose true truth value */
- #define FALSE 0 /* general purpose false truth value */
-
- /******* Number of sectors to use for buffered I/O: ***********
- The NSECTS symbol controls the compilation of the buffered
- I/O routines within STDLIB2.C, allowing each user to set the
- buffer size most convenient for his system, while keeping
- the numbers totally invisible to the C source programs using
- buffered I/O (via the BUFSIZ defined symbol.) For larger
- NSECTS, the disk I/O is faster...but more ram is taken up.
- Note that prior (pre 1.4) versions of the library functions
- were not set up to support this customizable buffer size,
- and always compiled as if NSECTS was 1 in this version. To
- change the buffer size allocation, follow these steps:
-
- 1) Alter NSECTS to the desired value here in bdscio.h
- 2) Re-compile STDLIB1.C and STDLIB2.C
- 3) Use CLIB to combine STDLIB1.CRL and STDLIB2.CRL to make
- a new DEFF.CRL.
-
- Make sure you use declare all your I/O buffers with the a
- statement such as:
- char buf_name[BUFSIZ];
- instead of the older and now obsolete:
- char buf_name[134];
- (and always #include "bdscio.h" in your programs!)
- ****************************************************************/
-
- #define NSECTS 8 /* Number of sectors to buffer up in ram */
-
- #define BUFSIZ (NSECTS * SECSIZ + 6 ) /* Don't touch this */
-
- struct _buf { /* Or this... */
- int _fd;
- int _nleft;
- char *_nextp;
- char _buff[NSECTS * SECSIZ];
- };
-
-
-
- /****************************************************************************
- If you plan to use the high-level storage allocation functions
- from the library ("alloc" and "free") then:
-
- 1) Uncomment (enable) the "ALLOC_ON" definition, and comment out the
- "ALLOC_OFF" definition from this file.
-
- 2) Re-compile STDLIB1.C, and use CLIB to transfer "alloc"
- and "free" into the DEFF.CRL library file.
-
- 3) THIS IS IMPORTANT!!! Include the statement:
-
- _allocp = NULL; /* initialize allocation pointer */
-
- somewhere in your "main" function PRIOR to the first use
- of the "alloc" function. DON'T FORGET THIS INITIALIZATION!!
-
- Remember to include bdscio.h in ALL files of your C program.
-
- The lack of static variables is the reason for all this messiness.
- ****************************************************************************/
-
- #define ALLOC_OFF 1 /* disables storage allocation if uncommented */
-
- /* only ONE of these two lines should be uncommented */
- /*
- #define ALLOC_ON 1 /* enables storgage allocation if uncommented */
- */
-
-
- #ifdef ALLOC_ON /* if storage allocation enabled, */
-
- struct _header {
- struct _header *_ptr;
- unsigned _size;
- };
-
- struct _header _base; /* declare this external data to */
- struct _header *_allocp; /* be used by alloc() and free() */
-
- #endif