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BDSCIO50.H
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C/C++ Source or Header
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2000-06-30
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3KB
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103 lines
/*
* The BDS C Standard I/O header file -- v1.50 7/27/82
*
* This file contains global definitions, for use in all C programs
* in PLACE of (yechhh) CONSTANTS. Characteristics of your system such
* buffered I/O allocations, storage allocator state, 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.
*/
/*
* General purpose Symbolic constants:
*/
#define BASE 0 /* Base of CP/M system RAM (0 or 0x4200) */
#define NULL 0
#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 JBUFSIZE 6 /* Length of setjump/longjump buffer */
#define CPMEOF 0x1a /* CP/M End-of-text-file marker (sometimes!) */
#define SECSIZ 128 /* Sector size for CP/M read/write calls */
#define MAXLINE 150 /* Longest line of input expected from the console */
#define TRUE 1 /* general purpose true truth value */
#define FALSE 0 /* general purpose false truth value */
/*
* 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.
* 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];
*/
#define NSECTS 8 /* Number of sectors to buffer up in ram */
#define BUFSIZ (NSECTS * SECSIZ + 7) /* Don't touch this */
struct _buf { /* Or this... */
int _fd;
int _nleft;
char *_nextp;
char _buff[NSECTS * SECSIZ];
char _flags;
};
#define FILE struct _buf /* Poor man's "typedef" */
#define _READ 1
#define _WRITE 2
/*
* 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.
*
* Remember to include bdscio.h in all files of your C program.
*
*/
/*
#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