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04cc463452
Please refer to https://github.com/cc65/cc65/pull/532 for background info.
I wrote in https://sourceforge.net/p/cc65/mailman/message/35873183/
===
cputs() wraps to the next line if the strings is too long to fit in the current line. I don't know if it's worth the effort to allow cpeeks() to continue reading from the next line. I'd like to discuss this aspect with the actual implementers.
===
This is still as unclear today as it was when I wrote the above. Therefore this change just doesn't add cpeeks() at all.
Since f8c6c58373 the Apple II CONIO implementation doesn't "need" revers() anymore - meaning that (nearly) every possible value can be placed in VRAM with a straight cputc() (without the need for a previous revers(1)).
The implementation of cpeekc() leverages that cputc() ability by always returning the value that can be fed into cputc() without a previous revers(1). Accordingly, cpeekrevers() always returns 0.
So after the sequence revers(1); cputc(x); a cpeekc() will return a value different from x! However, I don't see this behavior braking the cpeekc() contract. I see the cpeekc() contract being defined by the sequence textcolor(cpeekcolor()); revers(cpeekrevers()); cputc(cpeekc()); placing the very same value in VRAM that there was before. And that contract is fulfilled.
223 lines
8.8 KiB
C
223 lines
8.8 KiB
C
/*****************************************************************************/
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/* */
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/* conio.h */
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/* */
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/* Direct console I/O */
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/* */
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/* */
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/* */
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/* (C) 1998-2007 Ullrich von Bassewitz */
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/* Roemerstrasse 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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/*
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** This is the direct console interface for cc65. I do not like the function
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** names very much, but the first version started as a rewrite of Borland's
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** conio, and, even if the interface has changed, the names did not.
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**
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** The interface does direct screen I/O, so it is fast enough for most
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** programs. I did not implement text windows, since many applications do
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** not need them and should not pay for the additional overhead. It should
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** be easy to add text windows on a higher level if needed,
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**
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** Most routines do not check the parameters. This may be unfortunate but is
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** also related to speed. The coordinates are always 0/0 based.
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*/
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#ifndef _CONIO_H
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#define _CONIO_H
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#include <stdarg.h>
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#include <target.h>
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/*****************************************************************************/
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/* Functions */
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/*****************************************************************************/
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void clrscr (void);
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/* Clear the whole screen and put the cursor into the top left corner */
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unsigned char kbhit (void);
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/* Return true if there's a key waiting, return false if not */
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void __fastcall__ gotox (unsigned char x);
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/* Set the cursor to the specified X position, leave the Y position untouched */
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void __fastcall__ gotoy (unsigned char y);
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/* Set the cursor to the specified Y position, leave the X position untouched */
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void __fastcall__ gotoxy (unsigned char x, unsigned char y);
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/* Set the cursor to the specified position */
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unsigned char wherex (void);
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/* Return the X position of the cursor */
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unsigned char wherey (void);
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/* Return the Y position of the cursor */
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void __fastcall__ cputc (char c);
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/* Output one character at the current cursor position */
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void __fastcall__ cputcxy (unsigned char x, unsigned char y, char c);
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/* Same as "gotoxy (x, y); cputc (c);" */
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void __fastcall__ cputs (const char* s);
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/* Output a NUL-terminated string at the current cursor position */
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void __fastcall__ cputsxy (unsigned char x, unsigned char y, const char* s);
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/* Same as "gotoxy (x, y); puts (s);" */
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int cprintf (const char* format, ...);
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/* Like printf(), but uses direct screen output */
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int __fastcall__ vcprintf (const char* format, va_list ap);
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/* Like vprintf(), but uses direct screen output */
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char cgetc (void);
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/* Return a character from the keyboard. If there is no character available,
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** the function waits until the user does press a key. If cursor is set to
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** 1 (see below), a blinking cursor is displayed while waiting.
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*/
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int cscanf (const char* format, ...);
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/* Like scanf(), but uses direct keyboard input */
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int __fastcall__ vcscanf (const char* format, va_list ap);
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/* Like vscanf(), but uses direct keyboard input */
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char cpeekc (void);
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/* Return the character from the current cursor position */
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unsigned char cpeekcolor (void);
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/* Return the color from the current cursor position */
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unsigned char cpeekrevers (void);
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/* Return the reverse attribute from the current cursor position.
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** If the character is reversed, then return 1; return 0 otherwise.
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*/
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void __fastcall__ cpeeks (char* s, unsigned int length);
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/* Return a string of the characters that start at the current cursor position.
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** Put the string into the buffer to which "s" points. The string will have
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** "length" characters, then will be '\0'-terminated.
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*/
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unsigned char __fastcall__ cursor (unsigned char onoff);
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/* If onoff is 1, a cursor is displayed when waiting for keyboard input. If
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** onoff is 0, the cursor is hidden when waiting for keyboard input. The
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** function returns the old cursor setting.
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*/
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unsigned char __fastcall__ revers (unsigned char onoff);
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/* Enable/disable reverse character display. This may not be supported by
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** the output device. Return the old setting.
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*/
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unsigned char __fastcall__ textcolor (unsigned char color);
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/* Set the color for text output. The old color setting is returned. */
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unsigned char __fastcall__ bgcolor (unsigned char color);
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/* Set the color for the background. The old color setting is returned. */
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unsigned char __fastcall__ bordercolor (unsigned char color);
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/* Set the color for the border. The old color setting is returned. */
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void __fastcall__ chline (unsigned char length);
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/* Output a horizontal line with the given length starting at the current
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** cursor position.
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*/
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void __fastcall__ chlinexy (unsigned char x, unsigned char y, unsigned char length);
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/* Same as "gotoxy (x, y); chline (length);" */
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void __fastcall__ cvline (unsigned char length);
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/* Output a vertical line with the given length at the current cursor
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** position.
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*/
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void __fastcall__ cvlinexy (unsigned char x, unsigned char y, unsigned char length);
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/* Same as "gotoxy (x, y); cvline (length);" */
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void __fastcall__ cclear (unsigned char length);
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/* Clear part of a line (write length spaces). */
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void __fastcall__ cclearxy (unsigned char x, unsigned char y, unsigned char length);
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/* Same as "gotoxy (x, y); cclear (length);" */
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void __fastcall__ screensize (unsigned char* x, unsigned char* y);
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/* Return the current screen size. */
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void __fastcall__ cputhex8 (unsigned char val);
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void __fastcall__ cputhex16 (unsigned val);
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/* These shouldn't be here... */
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/*****************************************************************************/
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/* Macros */
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/*****************************************************************************/
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/* On some platforms, functions are not available or are dummys. To suppress
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** the call to these functions completely, the platform header files may
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** define macros for these functions that start with an underline. If such a
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** macro exists, a new macro is defined here, that expands to the one with the
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** underline. The reason for this two stepped approach is that it is sometimes
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** necessary to take the address of the function, which is not possible when
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** using a macro. Since the function prototype is still present, #undefining
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** the macro will give access to the actual function.
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*/
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#ifdef _textcolor
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# define textcolor(color) _textcolor(color)
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#endif
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#ifdef _bgcolor
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# define bgcolor(color) _bgcolor(color)
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#endif
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#ifdef _bordercolor
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# define bordercolor(color) _bordercolor(color)
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#endif
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#ifdef _cpeekcolor
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# define cpeekcolor() _cpeekcolor()
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#endif
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#ifdef _cpeekrevers
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# define cpeekrevers() _cpeekrevers()
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#endif
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/* End of conio.h */
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#endif
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