ack/plat/cpm/libsys/read.c

/* $Source$
 * $State$
 * $Revision$
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <cpm.h>

ssize_t read(int fd, void* buffer, size_t count)
{
	short save;
	unsigned char before_n;

	if (fd != 0)
	{
		errno = EBADF;
		return -1;
	}

	return fread(buffer, 1, count, stdin);
}
Added cpm platform. 2007-04-27 22:42:41 +00:00			`/* $Source$`
			`* $State$`
			`* $Revision$`
			`*/`

Partially working port of stdio to CP/M. I'm not sure this will work; it's getting way too complicated (stdio is horribly subtle). I think I need to rethink things. 2019-06-15 20:22:01 +00:00			`#include <stdio.h>`
Added cpm platform. 2007-04-27 22:42:41 +00:00			`#include <stdlib.h>`
			`#include <errno.h>`
			`#include <unistd.h>`
			`#include <cpm.h>`

Create a basic and probably wrong common unistd.h, which replaces the plat one. Made this work with cpm (but nothing else yet). 2018-06-23 09:46:55 +00:00			`ssize_t read(int fd, void* buffer, size_t count)`
Added cpm platform. 2007-04-27 22:42:41 +00:00			`{`
Enable the line editor in read() for CP/M. This changes the BDOS call from CPM_BDOS_CONSOLE_INPUT to CPN_BDOS_READ_CONSOLE_BUFFER. This allows commands like ^H to delete characters and ^C to exit to CCP. This is more like how Unix read(2) uses canonical mode of termios to read a line. This change has a disadvantage: the user buffer to read(2) must now be large enough for an entire line. This is because CP/M, unlike Unix, lacks a kernel buffer to hold the rest of the line. If you use a buffered input library like stdio to call read(2), then it works; but if you try to read part of a line or a single character, then it doesn't work. 2018-05-04 22:21:01 +00:00			`short save;`
			`unsigned char before_n;`

Partially working port of stdio to CP/M. I'm not sure this will work; it's getting way too complicated (stdio is horribly subtle). I think I need to rethink things. 2019-06-15 20:22:01 +00:00			`if (fd != 0)`
Added cpm platform. 2007-04-27 22:42:41 +00:00			`{`
			`errno = EBADF;`
			`return -1;`
			`}`
Enable the line editor in read() for CP/M. This changes the BDOS call from CPM_BDOS_CONSOLE_INPUT to CPN_BDOS_READ_CONSOLE_BUFFER. This allows commands like ^H to delete characters and ^C to exit to CCP. This is more like how Unix read(2) uses canonical mode of termios to read a line. This change has a disadvantage: the user buffer to read(2) must now be large enough for an entire line. This is because CP/M, unlike Unix, lacks a kernel buffer to hold the rest of the line. If you use a buffered input library like stdio to call read(2), then it works; but if you try to read part of a line or a single character, then it doesn't work. 2018-05-04 22:21:01 +00:00
Partially working port of stdio to CP/M. I'm not sure this will work; it's getting way too complicated (stdio is horribly subtle). I think I need to rethink things. 2019-06-15 20:22:01 +00:00			`return fread(buffer, 1, count, stdin);`
Added cpm platform. 2007-04-27 22:42:41 +00:00			`}`