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d898c1c356
emailler/apps/edit.c
Bobbi Webber-Manners d898c1c356 EDIT: All functions now working with gapbuf[] in aux mem
2020-08-08 19:29:33 -04:00

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/////////////////////////////////////////////////////////////////////////////
// Simple text editor
// Bobbi July-Aug 2020
/////////////////////////////////////////////////////////////////////////////
// Note: Use my fork of cc65 to get a flashing cursor!!
#define AUXMEM // Still somewhat experimental
#include <conio.h>
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define NCOLS 80 // Width of editing screen
#define NROWS 22 // Height of editing screen
#define CURSORROW 10 // Row cursor is initially shown on (if enough text)
#define PROMPT_ROW NROWS + 1 // Row where input prompt is shown
#define IOSZ 1024 // Size of chunks to use when loading/saving file
#define EOL '\r' // For ProDOS
#define BELL 0x07
#define BACKSPACE 0x08
#define RETURN 0x0d
#define ESC 0x1b
#define DELETE 0x7f
#ifdef AUXMEM
#define BUFSZ 0xb7fe // All of aux from 0x800 to 0xbfff, minus a byte
char iobuf[IOSZ]; // Buffer for disk I/O
#else
#define BUFSZ (20480 - 1024) // 19KB
char gapbuf[BUFSZ];
char padding = 0; // To null terminate for strstr()
#endif
uint16_t gapbegin = 0;
uint16_t gapend = BUFSZ - 1;
uint8_t rowlen[NROWS]; // Number of chars on each row of screen
char filename[80] = "";
char userentry[82] = ""; // Couple extra chars so we can store 80 col line
char search[80] = "";
char replace[80] = "";
// Interface to read_char_update_pos()
uint8_t do_print, modified;
uint16_t pos, startsel, endsel;
uint8_t row, col;
uint8_t cursrow, curscol; // Cursor position is kept here by draw_screen()
uint8_t quit_to_email; // If 1, launch EMAIL.SYSTEM on quit
uint8_t modified; // If 1, file contents have been modified
// The order of the cases matters! SRCH1/2/3 are not really a selection modes.
enum selmode {SEL_NONE, SEL_DEL2, SEL_COPY2, SEL_MOVE2, SEL_DEL, SEL_MOVE, SEL_COPY,
SRCH1, SRCH2, SRCH3};
enum selmode mode;
// Mousetext Open-Apple
char openapple[] = "\x0f\x1b""A\x18\x0e";
/*
* Return number of bytes of freespace in gapbuf
*/
#define FREESPACE() (gapend - gapbegin + 1)
/*
* Return number of bytes of data in gapbuf
*/
#define DATASIZE() (gapbegin + (BUFSZ - 1 - gapend))
/*
* Obtain current position in gapbuf
* This is the positon where the next character will be inserted
*/
#define GETPOS() (gapbegin)
/*
* Obtain one byte from the gapbuf[] in aux memory
* Must be in LC
* i - Index into gapbuf[]
* Returns value at gapbuf[i]
*/
#pragma code-name (push, "LC")
char get_gapbuf(uint16_t i) {
#ifdef AUXMEM
*(uint16_t*)(0xfe) = (uint16_t)0x0800 + i; // Stuff address in Zero Page
__asm__("sta $c003"); // Read aux mem
__asm__("lda ($fe)");
__asm__("sta $ff");
__asm__("sta $c002"); // Read main mem
return *(uint8_t*)(0xff);
#else
return gapbuf[i];
#endif
}
#pragma code-name (pop)
/*
* Set one byte in the gapbuf[] in aux memory
* Must be in LC
* i - Index into gapbuf
* c - Byte value to set
*/
#pragma code-name (push, "LC")
void set_gapbuf(uint16_t i, char c) {
#ifdef AUXMEM
__asm__("sta $c005"); // Write aux mem
(*(char*)((char*)0x0800 + i)) = c;
__asm__("sta $c004"); // Write main mem
#else
gapbuf[i] = c;
#endif
}
#pragma code-name (pop)
/*
* Do a memmove() on aux memory. Uses indices into gapbuf[].
* Must be in LC
* dst - Destination index into gapbuf[]
* src - Source index into gapbuf[]
* n - Length in bytes
*/
#pragma code-name (push, "LC")
void move_in_gapbuf(uint16_t dst, uint16_t src, size_t n) {
#ifdef AUXMEM
if (dst > src) {
// Start with highest addr and copy downwards
*(uint16_t*)(0xfa) = n; // Stuff sz in ZP
*(uint16_t*)(0xfc) = (uint16_t)0x0800 + src + n - 1; // Stuff src in ZP
*(uint16_t*)(0xfe) = (uint16_t)0x0800 + dst + n - 1; // Stuff dst in ZP
#ifdef AUXMEM
__asm__("sta $c005"); // Write aux mem
__asm__("sta $c003"); // Read aux mem
#endif
dl1:
__asm__("lda ($fc)"); // *src
__asm__("sta ($fe)"); // -> *dst
__asm__("lda $fc"); // LSB of src
__asm__("bne %g", ds1);
__asm__("dec $fd"); // MSB of src
ds1:
__asm__("dec $fc"); // LSB of src
__asm__("lda $fe"); // LSB of dst
__asm__("bne %g", ds2);
__asm__("dec $ff"); // MSB of dst
ds2:
__asm__("dec $fe"); // LSB of dst
__asm__("lda $fa"); // LSB of n
__asm__("bne %g", ds3);
__asm__("dec $fb"); // MSB of n
ds3:
__asm__("dec $fa"); // LSB of n
__asm__("bne %g", dl1); // Loop
__asm__("lda $fb"); // MSB of n
__asm__("bne %g", dl1); // Loop
#ifdef AUXMEM
__asm__("sta $c002"); // Read main mem
__asm__("sta $c004"); // Write main mem
#endif
} else {
// Start with highest addr and copy upwards
*(uint16_t*)(0xfa) = n; // Stuff sz in ZP
*(uint16_t*)(0xfc) = (uint16_t)0x0800 + src; // Stuff src in ZP
*(uint16_t*)(0xfe) = (uint16_t)0x0800 + dst; // Stuff dst in ZP
#ifdef AUXMEM
__asm__("sta $c005"); // Write aux mem
__asm__("sta $c003"); // Read aux mem
#endif
al1:
__asm__("lda ($fc)"); // *src // d517
__asm__("sta ($fe)"); // -> *dst
__asm__("inc $fc"); // LSB of src
__asm__("bne %g", as1);
__asm__("inc $fd"); // MSB of src
as1:
__asm__("inc $fe"); // LSB of dst
__asm__("bne %g", as2);
__asm__("inc $ff"); // MSB of dst
as2:
__asm__("lda $fa"); // LSB of n
__asm__("bne %g", as3);
__asm__("dec $fb"); // MSB of n
as3:
__asm__("dec $fa"); // LSB of n
__asm__("bne %g", al1); // Loop
__asm__("lda $fb"); // MSB of n
__asm__("bne %g", al1); // Loop
#ifdef AUXMEM
__asm__("sta $c002"); // Read main mem
__asm__("sta $c004"); // Write main mem
#endif
}
#else
memmove(gapbuf + dst, gapbuf + src, n);
#endif
}
#pragma code-name (pop)
#pragma data-name (push, "LC")
char needle[80] = "The"; // Must be in LC memory if using AUXMEM
#pragma data-name (pop)
/*
* Do a strstr() on aux memory. Uses index into gapbuf[].
* Must be in LC
* i - Index into gapbuf[]
* srch - String to search for
* loc - Location where string found (index into gapbuf[]) returned here
* Returns 1 if found, 0 otherwise
*/
#pragma code-name (push, "LC")
#pragma optimize (off)
uint8_t search_in_gapbuf(uint16_t i, char *srch, uint16_t *loc) {
__asm__("lda $c083"); // Read and write LC RAM bank 2
__asm__("lda $c083"); // Read and write LC RAM bank 2
memcpy(needle, srch, 80);
// ZP usage
// $f7: TMP1
// $f8-$f9: PTR4 in original strstr.s code.
// $fa-$fb: PTR1 in original strstr.s code.
// $fc-$fd: PTR2 in original strstr.s code.
// $fe-$ff: PTR3 in original strstr.s code.
*(uint16_t*)(0xfc) = (uint16_t)needle;
*(uint16_t*)(0xf8) = (uint16_t)needle; // Another copy of needle ptr
#ifdef AUXMEM
*(uint16_t*)(0xfa) = (uint16_t)0x0800 + i; // Haystack pointer
__asm__("sta $c005"); // Write aux mem
__asm__("sta $c003"); // Read aux mem
#else
*(uint16_t*)(0xfa) = (uint16_t)gapbuf + i; // Haystack pointer
#endif
__asm__("ldy #$00");
__asm__("lda ($fc),y"); // Get first byte of needle
__asm__("beq %g", found); // Needle is empty --> we're done
// Search for beginning of string
__asm__("sta $f7"); // Save start of needle
l1:
__asm__("lda ($fa),y"); // Get next char from haystack
__asm__("beq %g", notfound); // Jump if end
__asm__("cmp $f7"); // Start of needle found?
__asm__("beq %g", l2); // Jump if so
__asm__("iny"); // Next char
__asm__("bne %g", l1);
__asm__("inc $fb"); // Bump high byte of haystack
__asm__("bne %g", l1); // Branch always
// We found the start of needle in haystack
l2:
__asm__("tya"); // Get offset
__asm__("clc");
__asm__("adc $fa");
__asm__("sta $fa"); // Make ptr1 point to start
__asm__("bcc %g", l3);
__asm__("inc $fb");
// ptr1 points to the start of needle now. Setup temporary pointers for the
// search. The low byte of ptr4 is already set.
l3:
__asm__("sta $fe"); // LSB PTR3
__asm__("lda $fb"); // MSB PTR1
__asm__("sta $ff"); // MSB PTR3
__asm__("lda $fd"); // MSB PTR2
__asm__("sta $f9"); // MSB PTR4
__asm__("ldy #1"); // First char is identical, so start on second
// Do the compare
l4:
__asm__("lda ($f8),y"); // Get char from needle
__asm__("beq %g", found); // Jump if end of needle (-> found)
__asm__("cmp ($fe),y"); // Compare with haystack
__asm__("bne %g", l5); // Jump if not equal
__asm__("iny"); // Next char
__asm__("bne %g", l4);
__asm__("inc $ff");
__asm__("inc $f9"); // Bump hi byte of pointers
__asm__("bne %g", l4); // Next char (branch always)
// The strings did not compare equal, search next start of needle
l5:
__asm__("ldy #1"); // Start after this char
__asm__("bne %g", l1); // Branch always
// We found the needle
found:
#ifdef AUXMEM
__asm__("sta $c002"); // Read main mem
__asm__("sta $c004"); // Write main mem
*loc = *(uint16_t*)0xfa - 0x0800;
#else
*loc = *(uint16_t*)0xfa - (uint16_t)gapbuf;
#endif
return 1;
// We reached end of haystack without finding needle
notfound:
#ifdef AUXMEM
__asm__("sta $c002"); // Read main mem
__asm__("sta $c004"); // Write main mem
#endif
return 0;
//#else
// char *p = strstr(gapbuf + i, needle);
// if (p) {
// *loc = p - gapbuf;
// return 1;
// } else
// return 0;
//#endif
}
#pragma optimize (on)
#pragma code-name (pop)
/*
* Annoying beep
*/
void beep(void) {
uint8_t *p = (uint8_t*)0xc030; // Speaker
uint8_t junk;
uint16_t i;
for (i = 0; i < 200; ++i) {
junk = *p;
for (junk = 0; junk < 50; ++junk); // Reduce pitch
}
}
/*
* Clear to EOL
*/
void clreol(void) {
uint8_t x = wherex(), y = wherey();
cclear(80 - x);
gotoxy(x, y);
}
/*
* Clear to EOL, wrap to next line
*/
void clreol_wrap(void) {
uint8_t x = wherex();
cclear(80 - x);
gotox(x);
}
/*
* Clear line
*/
void clrline(void) {
uint8_t x = wherex();
gotox(0);
cclear(80);
gotox(x);
}
/*
* Put cursor at beginning of PROMPT_ROW
*/
void goto_prompt_row(void) {
gotoxy(0, PROMPT_ROW);
}
/*
* Refresh the status line at the bottom of the screen
*/
void update_status_line(void) {
uint8_t nofile = 0;
uint8_t i, l;
static char selmsg1[] = ": Go to end of selection, then [Return]";
static char selmsg2[] = ": Go to target, then [Return] to ";
goto_prompt_row();
if (strlen(filename) == 0) {
strcpy(filename, "<scratch>");
nofile = 1;
}
revers(1);
switch (mode) {
case SEL_NONE:
cprintf("OA-? Help | %c File:%s %2uKB free",
modified ? '*' : ' ', filename, (FREESPACE() + 512) / 1024);
l = 50 - strlen(filename);
break;
case SEL_DEL:
cprintf("Del%s", selmsg1);
l = 80 - 42;
break;
case SEL_COPY:
cprintf("Copy%s", selmsg1);
l = 80 - 43;
break;
case SEL_MOVE:
cprintf("Move%s", selmsg1);
l = 80 - 43;
break;
case SEL_COPY2:
cprintf("Copy%scopy", selmsg2);
l = 80 - 41;
break;
case SEL_MOVE2:
cprintf("Move%smove", selmsg2);
l = 80 - 41;
break;
case SRCH1:
cprintf("Searching ...");
l = 80 - 13;
break;
case SRCH2:
cprintf("Searching - wrapped ...");
l = 80 - 23;
break;
case SRCH3:
cprintf("OA-? Help | %c File:%s %2uKB free | Not Found",
modified ? '*' : ' ', filename, (FREESPACE() + 512) / 1024);
l = 50 - 12 - strlen(filename);
break;
}
for (i = 0; i < l; ++i)
cputc(' ');
revers(0);
if (nofile)
strcpy(filename, "");
gotoxy(curscol, cursrow);
cursor(1);
}
/*
* Set modified status
*/
void set_modified(uint8_t mod) {
if (modified == mod)
return;
modified = mod;
update_status_line();
}
/*
* Prompt for a name in the bottom line of the screen
* Returns number of chars read.
* prompt - Message to display before > prompt
* is_file - if 1, restrict chars to those allowed in ProDOS filename
* Returns number of chars read, or 255 if ESC pressed
*/
uint8_t prompt_for_name(char *prompt, uint8_t is_file) {
uint16_t i;
char c;
cursor(0);
goto_prompt_row();
clreol();
revers(1);
cprintf("%s>", prompt);
revers(0);
gotox(2 + strlen(prompt));
i = 0;
while (1) {
c = cgetc();
if (is_file && !isalnum(c) && (c != RETURN) && (c != BACKSPACE) &&
(c != DELETE) && (c != ESC) && (c != '.') && (c != '/')) {
beep();
continue;
}
switch (c) {
case RETURN:
goto done;
case BACKSPACE:
case DELETE:
if (i > 0) {
gotox(wherex() - 1);
cputc(' ');
gotox(wherex() - 1);
--i;
} else
beep();
break;
case ESC:
userentry[0] = '\0';
i = 255;
goto esc_pressed;
default:
cputc(c);
userentry[i++] = c;
}
if (i == 79)
goto done;
}
done:
userentry[i] = '\0';
esc_pressed:
clrline();
gotoxy(curscol, cursrow);
cursor(1);
return i;
}
/*
* Prompt ok?
*/
char prompt_okay(char *msg) {
char c;
cursor(0);
goto_prompt_row();
clreol();
revers(1);
cprintf("%sSure? (y/n)", msg);
revers(0);
while (1) {
c = cgetc();
if ((c == 'y') || (c == 'Y') || (c == 'n') || (c == 'N') || c == ESC)
break;
beep();
}
if ((c == 'y') || (c == 'Y'))
c = 1;
else
c = 0;
update_status_line();
return c;
}
/*
* Error message
*/
void show_error(char *msg) {
cursor(0);
goto_prompt_row();
clreol();
beep();
revers(1);
cprintf("%s [Press Any Key]", msg);
revers(0);
cgetc();
update_status_line();
}
/*
* Insert a character into gapbuf at current position
* c - character to insert
*/
void insert_char(char c) {
if (FREESPACE()) {
set_gapbuf(gapbegin++, c);
return;
}
beep();
}
/*
* Delete the character to the left of the current position
*/
#pragma code-name (push, "LC")
void delete_char(void) {
if (gapbegin == 0) {
beep();
return;
}
--gapbegin;
}
#pragma code-name (pop)
/*
* Delete the character to the right of the current position
*/
#pragma code-name (push, "LC")
void delete_char_right(void) {
if (gapend == BUFSZ - 1) {
beep();
return;
}
++gapend;
}
#pragma code-name (pop)
/*
* Move the current position
* pos - position to which to move
*/
void jump_pos(uint16_t pos) {
uint16_t l;
if (pos > BUFSZ - 1) {
beep();
return;
}
if (pos == GETPOS())
return;
if (pos > GETPOS()) {
l = pos - gapbegin;
move_in_gapbuf(gapbegin, gapend + 1, l);
gapbegin += l;
gapend += l;
} else {
l = gapbegin - pos;
move_in_gapbuf(gapend - l + 1, gapbegin - l, l);
gapbegin -= l;
gapend -= l;
}
if (mode > SEL_MOVE2)
endsel = gapbegin;
return;
}
/*
* Go to next tabstop
*/
#pragma code-name (push, "LC")
uint8_t next_tabstop(uint8_t col) {
return (col / 8) * 8 + 8;
}
#pragma code-name (pop)
/*
* Load a file from disk into the gapbuf
* filename - name of file to load
* replace - if 1, replace old file.
* initialcol - initial screen column
* Returns 0 on success
* 1 if file can't be opened
*/
#pragma code-name (push, "LC")
uint8_t load_file(char *filename, uint8_t replace) {
uint8_t col;
char *p;
uint16_t i, j, s;
uint8_t c, cont;
FILE *fp = fopen(filename, "r");
if (!fp)
return 1;
if (!replace)
col = curscol;
goto_prompt_row();
if (replace) {
gapbegin = 0;
gapend = BUFSZ - 1;
col = 0;
}
#ifdef AUXMEM
p = iobuf;
#else
p = gapbuf + gapend - IOSZ; // Read to mem just before gapend
#endif
do {
if (FREESPACE() < IOSZ * 2) {
show_error("File truncated");
goto done;
}
cputc('.');
s = fread(p, 1, IOSZ, fp);
cont = (s == IOSZ ? 1 : 0);
for (i = 0; i < s; ++i) {
switch (p[i]) {
case '\r': // Native Apple2 files
case '\n': // UNIX files
set_gapbuf(gapbegin++, '\r');
col = 0;
break;
case '\t':
c = next_tabstop(col) - col;
for (j = 0; j < c; ++j)
set_gapbuf(gapbegin++, ' ');
col += c;
break;
default:
set_gapbuf(gapbegin++, p[i]);
++col;
}
if (FREESPACE() < IOSZ * 2) {
show_error("File truncated");
goto done;
}
}
} while (cont);
--gapbegin; // Eat EOF character
done:
fclose(fp);
if (replace) {
jump_pos(0);
pos = 0;
set_modified(0);
startsel = endsel = 65535U;
mode = SEL_NONE;
}
return 0;
}
#pragma code-name (pop)
/*
* Save gapbuf to file
* filename - name of file to load
* Returns 0 on success
* 1 if file can't be opened
*/
#ifndef AUXMEM
#pragma code-name (push, "LC")
#endif
uint8_t save_file(char *filename) {
uint16_t pos = gapbegin;
uint8_t retval = 1;
char *p;
uint8_t i;
#ifdef AUXMEM
uint16_t j;
#endif
FILE *fp;
_filetype = PRODOS_T_TXT;
_auxtype = 0;
fp = fopen(filename, "w");
if (!fp)
goto done;
jump_pos(0);
goto_prompt_row();
#ifdef AUXMEM
p = gapend + 1;
#else
p = gapbuf + gapend + 1;
#endif
for (i = 0; i < DATASIZE() / IOSZ; ++i) {
cputc('.');
#ifdef AUXMEM
for (j = 0; j < IOSZ; ++j)
iobuf[j] = get_gapbuf(p++);
if (fwrite(iobuf, IOSZ, 1, fp) != 1)
goto done;
#else
if (fwrite(p, IOSZ, 1, fp) != 1)
goto done;
p += IOSZ;
#endif
}
cputc('.');
#ifdef AUXMEM
for (j = 0; j < DATASIZE() - (IOSZ * i); ++j)
iobuf[j] = get_gapbuf(p++);
if (fwrite(iobuf, DATASIZE() - (IOSZ * i), 1, fp) != 1)
goto done;
#else
if (fwrite(p, DATASIZE() - (IOSZ * i), 1, fp) != 1)
goto done;
#endif
retval = 0;
done:
fclose(fp);
jump_pos(pos);
return 0;
}
#ifndef AUXMEM
#pragma code-name (pop)
#endif
/*
* Read next char from gapbuf[] and update state.
* Returns 1 on EOL, 0 otherwise
* If do_print is set, print char on the screen.
* Interface is via the following globals:
* do_print - if 1, update screen
* pos - position in buffer, advanced by one
* row, col - position on screen
* rowlen[] - length of each screen row in chars
*/
uint8_t read_char_update_pos(void) {
uint16_t delta = gapend - gapbegin;
char c;
if ((c = get_gapbuf(pos++)) == EOL) {
if (do_print) {
rowlen[row] = col + 1;
clreol_wrap();
gotox(0);
}
++row;
col = 0;
return 1;
}
if (((pos > startsel) && (pos <= endsel)) || // Left of cursor
((pos - delta > endsel) && (pos - delta <= startsel + 1))) // Right of cursor
revers(1);
else
revers(0);
if (do_print)
cputc(c);
revers(0);
++col;
if (do_print)
rowlen[row] = col;
if (col == NCOLS) {
++row;
col = 0;
}
return 0;
}
/*
* Draw screenful of text
*/
void draw_screen(void) {
uint16_t startpos;
uint8_t rowsabove, cursorrow;
// Initialize all rows to length 0 to cover those rows that may have
// no text and would otherwise be unitialized.
for (rowsabove = 0; rowsabove < NROWS; ++rowsabove)
rowlen[rowsabove] = 0;
// First we have to scan back to work out where in the buffer to
// start drawing on the screen at the top left. This is at most
// NROWS * NCOLS chars.
startpos = gapbegin;
if (startpos > NROWS * NCOLS)
startpos -= NROWS * NCOLS;
else
startpos = 0;
// Format the text and work out the number of rows it takes up
pos = startpos;
row = col = 0;
do_print = 0;
while (pos < gapbegin)
read_char_update_pos();
rowsabove = row; // Number of complete rows above cursor
if (rowsabove <= CURSORROW) {
pos = 0;
cursorrow = rowsabove;
} else {
cursorrow = CURSORROW;
// Now repeat the formatting of the text, eating the first
// (rowsabove - cursorrow) lines
pos = startpos;
row = col = 0;
while (row < (rowsabove - cursorrow))
read_char_update_pos();
}
// Finally actually write the text to the screen!
videomode(VIDEOMODE_80COL);
clrscr();
revers(0);
row = col = 0;
do_print = 1;
while (pos < gapbegin)
read_char_update_pos();
curscol = col;
cursrow = row;
// Now write the text after the cursor up to the end of the screen
pos = gapend + 1;
while ((pos < BUFSZ) && (row < NROWS))
read_char_update_pos();
update_status_line();
}
/*
* Scroll screen up and update rowlen[]
*/
void scroll_up() {
draw_screen();
}
/*
* Scroll screen down and update rowlen[]
*/
void scroll_down() {
draw_screen();
}
/*
* Returns 1 if current position in gap buffer is on the last line of
* the file (ie: no following CR), 0 otherwise
*/
uint8_t is_last_line(void) {
uint16_t p = gapend + 1;
while (p < BUFSZ) {
if (get_gapbuf(p++) == '\r')
return 0;
}
return 1;
}
/*
* Update screen after delete_char_right()
*/
void update_after_delete_char_right(void) {
uint8_t eol = 0;
uint8_t i;
col = curscol;
row = cursrow;
do_print = 1;
// Print rest of line up to EOL
pos = gapend + 1;
while (!eol && (pos < BUFSZ) && (row < NROWS)) {
i = col;
eol = read_char_update_pos();
}
if (is_last_line())
clreol_wrap();
// If necessary, print rest of screen
if ((get_gapbuf(gapend) == EOL) || (i == NCOLS - 1)) {
while ((pos < BUFSZ) && (row < NROWS))
read_char_update_pos();
clreol_wrap();
// Erase the rest of the screen (if any)
for (i = row + 1; i < NROWS; ++i) {
gotoxy(0, i);
clrline();
}
}
gotoxy(curscol, cursrow);
cursor(1);
}
/*
* Update screen after delete_char()
*/
void update_after_delete_char(void) {
uint8_t eol = 0;
uint8_t i;
col = curscol;
row = cursrow;
if (get_gapbuf(gapbegin) == EOL) {
// Special handling if we deleted an EOL
if (row > 0)
col = rowlen[--row] - 1;
else {
scroll_up();
return;
}
} else {
// Erase char to left of cursor & update row, col
gotox(wherex() - 1);
cputc(' ');
gotox(wherex() - 1);
if (col > 0)
--col;
else {
col = NCOLS - 1;
if (row > 0)
--row;
else {
scroll_up();
return;
}
}
}
curscol = col;
cursrow = row;
gotoxy(curscol, cursrow);
do_print = 1;
// Print rest of line up to EOL
pos = gapend + 1;
while (!eol && (pos < BUFSZ) && (row < NROWS)) {
i = col;
eol = read_char_update_pos();
}
if (is_last_line())
clreol_wrap();
// If necessary, print rest of screen
if ((get_gapbuf(gapbegin) == EOL) || (i == NCOLS - 1)) {
while ((pos < BUFSZ) && (row < NROWS))
read_char_update_pos();
clreol_wrap();
// Erase the rest of the screen (if any)
for (i = row + 1; i < NROWS; ++i) {
gotoxy(0, i);
clrline();
}
}
gotoxy(curscol, cursrow);
cursor(1);
}
/*
* Update screen after insert_char()
*/
void update_after_insert_char(void) {
uint8_t eol = 0;
uint8_t prevcol;
col = curscol;
row = cursrow;
// Print character just inserted
pos = gapbegin - 1;
do_print = 1;
read_char_update_pos();
curscol = col;
cursrow = row;
gotoxy(curscol, cursrow);
if (cursrow == NROWS) {
scroll_down();
return;
}
// Print rest of line up to EOL
pos = gapend + 1;
while (!eol && (pos < BUFSZ) && (row < NROWS)) {
prevcol = col;
eol = read_char_update_pos();
}
// If necessary, print rest of screen
if ((get_gapbuf(gapbegin - 1) == EOL) || (prevcol == 0))
while ((pos < BUFSZ) && (row < NROWS))
read_char_update_pos();
gotoxy(curscol, cursrow);
cursor(1);
}
/*
* Move the cursor left
*/
#pragma code-name (push, "LC")
void cursor_left(void) {
if (gapbegin > 0)
set_gapbuf(gapend--, get_gapbuf(--gapbegin));
else {
beep();
gotoxy(curscol, cursrow);
return;
}
if (curscol == 0) {
if (cursrow == 0) {
scroll_up();
if (cursrow == 0) {
beep();
return;
}
}
--cursrow;
curscol = rowlen[cursrow] - 1;
} else
--curscol;
gotoxy(curscol, cursrow);
if (mode > SEL_MOVE2) {
endsel = gapbegin;
revers(gapbegin < startsel ? 1 : 0);
cputc(get_gapbuf(gapbegin));
}
revers(0);
gotoxy(curscol, cursrow);
}
#pragma code-name (pop)
/*
* Move the cursor right
*/
#pragma code-name (push, "LC")
void cursor_right(void) {
if (gapend < BUFSZ - 1)
set_gapbuf(gapbegin++, get_gapbuf(++gapend));
else {
beep();
goto done;
}
++curscol;
if (gapend == BUFSZ - 1)
goto done;
if (curscol == rowlen[cursrow]) {
if (cursrow == NROWS - 1)
scroll_down();
++cursrow;
curscol = 0;
}
done:
if (mode > SEL_MOVE2) {
endsel = gapbegin;
revers(gapbegin > startsel ? 1 : 0);
cputc(get_gapbuf(gapbegin - 1));
}
revers(0);
gotoxy(curscol, cursrow);
}
#pragma code-name (pop)
/*
* Move the cursor up
* Returns 1 if at top, 0 otherwise
*/
#pragma code-name (push, "LC")
uint8_t cursor_up(void) {
uint8_t i;
if (cursrow == 0) {
scroll_up();
if (cursrow == 0) {
beep();
gotoxy(curscol, cursrow);
return 1;
}
}
for (i = curscol; i > 0; --i) {
set_gapbuf(gapend--, get_gapbuf(--gapbegin));
if (mode > SEL_MOVE2) {
gotoxy(i - 1, cursrow);
revers(gapbegin < startsel ? 1 : 0);
cputc(get_gapbuf(gapbegin));
}
}
--cursrow;
// Short line ...
if (curscol > rowlen[cursrow] - 1)
curscol = rowlen[cursrow] - 1;
for (i = rowlen[cursrow]; i > curscol; --i) {
set_gapbuf(gapend--, get_gapbuf(--gapbegin));
if (mode > SEL_MOVE2) {
gotoxy(i - 1, cursrow);
revers(gapbegin < startsel ? 1 : 0);
cputc(get_gapbuf(gapbegin));
}
}
if (mode > SEL_MOVE2) {
endsel = gapbegin;
}
revers(0);
gotoxy(curscol, cursrow);
return 0;
}
#pragma code-name (pop)
/*
* Move the cursor down
* Returns 1 if at bottom, 0 otherwise
*/
#pragma code-name (push, "LC")
uint8_t cursor_down(void) {
uint8_t i;
if (cursrow == NROWS - 1)
scroll_down();
if ((get_gapbuf(gapend + rowlen[cursrow] - curscol) != EOL) &&
(rowlen[cursrow] != NCOLS))
return 1; // Last line
for (i = 0; i < rowlen[cursrow] - curscol; ++i) {
if (gapend < BUFSZ - 1) {
set_gapbuf(gapbegin++, get_gapbuf(++gapend));
if (mode > SEL_MOVE2) {
revers(gapbegin > startsel ? 1 : 0);
cputc(get_gapbuf(gapbegin - 1));
}
}
else {
beep();
return 1;
}
}
++cursrow;
// Short line ...
if (curscol > rowlen[cursrow] - 1)
curscol = rowlen[cursrow] - 1;
gotoxy(0, cursrow);
for (i = 0; i < curscol; ++i) {
if (gapend < BUFSZ - 1) {
set_gapbuf(gapbegin++, get_gapbuf(++gapend));
if (mode > SEL_MOVE2) {
revers(gapbegin > startsel ? 1 : 0);
cputc(get_gapbuf(gapbegin - 1));
}
}
}
if (mode > SEL_MOVE2) {
endsel = gapbegin;
}
revers(0);
gotoxy(curscol, cursrow);
return 0;
}
#pragma code-name (pop)
/*
* Goto beginning of line
*/
#pragma code-name (push, "LC")
void goto_bol(void) {
while (curscol > 0)
cursor_left();
}
#pragma code-name (pop)
/*
* Goto end of line
*/
#pragma code-name (push, "LC")
void goto_eol(void) {
while (curscol < rowlen[cursrow] - 1)
cursor_right();
}
#pragma code-name (pop)
/*
* Word left
*/
#pragma code-name (push, "LC")
void word_left(void) {
do {
cursor_left();
} while ((get_gapbuf(gapbegin) != ' ') && (get_gapbuf(gapbegin) != EOL) &&
(gapbegin > 0));
}
#pragma code-name (pop)
/*
* Word right
*/
#pragma code-name (push, "LC")
void word_right(void) {
do {
cursor_right();
} while ((get_gapbuf(gapbegin) != ' ') && (get_gapbuf(gapbegin) != EOL) &&
(gapend < BUFSZ - 1));
}
#pragma code-name (pop)
/*
* Jump forward 15 screen lines
*/
void page_down(void) {
uint8_t i;
for (i = 0; i < 15; ++i)
if (cursor_down() == 1)
break;
}
/*
* Jump back 15 screen lines
*/
void page_up(void) {
uint8_t i;
for (i = 0; i < 15; ++i)
if (cursor_up() == 1)
break;
}
/*
* Perform word-wrapping on current paragraph
* addbreaks - if 1, add breaks to do word wrap, otherwise it 'unwraps'
* (ie: removes all carriage returns in paragraph)
*/
void word_wrap_para(uint8_t addbreaks) {
uint16_t i = gapbegin;
uint8_t rets = 0, col = 0;
uint16_t startpara = 0;
// Find start of paragraph ("\r\r" delimiter)
while (i > 0) {
--i;
if (get_gapbuf(i) == '\r')
++rets;
else
rets = 0;
if (rets == 2) {
startpara = i + 2;
break;
}
}
// Iterate through para, up to the cursor
i = startpara;
while (i < gapbegin) {
if (get_gapbuf(i) == '\r')
set_gapbuf(i, ' ');
++col;
if (addbreaks && (col == 76)) {
// Backtrack to find a space
while ((get_gapbuf(i) != ' ') && (i > startpara))
--i;
if (i == startpara) {
beep();
return;
}
set_gapbuf(i, '\r'); // Break line
col = 0;
}
++i;
}
}
/*
* Help screen
* EDITHELP.TXT is expected to contain lines of exactly 80 chars
*/
#pragma code-name (push, "LC")
void help(void) {
FILE *fp = fopen("EDITHELP.TXT", "rb");
char *p;
char c;
uint16_t i, s;
uint8_t cont;
revers(0);
cursor(0);
clrscr();
if (!fp) {
printf("Can't open EDITHELP.TXT\n\n");
goto done;
}
#ifdef AUXMEM
p = iobuf;
#else
p = gapbuf + gapend - IOSZ; // Read to just before gapend
#endif
do {
if (FREESPACE() < IOSZ) {
beep();
goto done;
}
s = fread(p, 1, IOSZ, fp);
cont = (s == IOSZ ? 1 : 0);
for (i = 0; i < s; ++i) {
c = p[i];
if (c == '@')
printf("%s", openapple);
else if ((c != '\r') && (c != '\n'))
putchar(c);
}
} while (cont);
done:
fclose(fp);
printf("[Press Any Key]");
cgetc();
clrscr();
}
#pragma code-name (pop)
/*
* Load EMAIL.SYSTEM to $2000 and jump to it
* (This code is in language card space so it can't possibly be trashed)
*/
#pragma code-name (push, "LC")
void load_email(void) {
revers(0);
clrscr();
exec("EMAIL.SYSTEM", NULL); // Assume it is in current directory
}
#pragma code-name (pop)
/*
* Load ATTACHER.SYSTEM to $2000 and jump to it
* (This code is in language card space so it can't possibly be trashed)
*/
#pragma code-name (push, "LC")
void load_attacher(void) {
revers(0);
clrscr();
exec("ATTACHER.SYSTEM", filename); // Assume it is in current directory
}
#pragma code-name (pop)
/*
* Save file to disk, handle user interface
*/
void save(void) {
if (strlen(filename) == 0) {
if (prompt_for_name("File to save", 1) == 255)
return; // If ESC pressed
if (strlen(userentry) == 0)
return;
strcpy(filename, userentry);
}
sprintf(userentry, "Save to %s - ", filename);
if (prompt_okay(userentry)) {
if (save_file(filename)) {
sprintf(userentry, "%cCan't save %s", filename);
show_error(userentry);
draw_screen();
} else {
set_modified(0);
}
}
}
/*
* Main editor routine
*/
int edit(char *fname) {
char c;
uint16_t pos, tmp, foundpos;
uint8_t i;
videomode(VIDEOMODE_80COL);
if (fname) {
strcpy(filename, fname);
cprintf("Loading file %s ", filename);
if (load_file(filename, 1)) {
sprintf(userentry, "Can't load %s", filename);
show_error(userentry);
strcpy(filename, "");
}
}
jump_pos(0);
pos = 0;
set_modified(0);
startsel = endsel = 65535U;
mode = SEL_NONE;
draw_screen();
while (1) {
cursor(1);
c = cgetc();
if (mode == SRCH3) // Reset 'Not found'
mode = SEL_NONE;
switch (c) {
case ESC: // Escape from block mode operations
startsel = endsel = 65535U;
mode = SEL_NONE;
draw_screen();
break;
case 0x80 + '1': // Top
jump_pos(0);
draw_screen();
break;
case 0x80 + '2':
jump_pos(DATASIZE() / 8);
draw_screen();
break;
case 0x80 + '3':
jump_pos(2L * DATASIZE() / 8);
draw_screen();
break;
case 0x80 + '4':
jump_pos(3L * DATASIZE() / 8);
draw_screen();
break;
case 0x80 + '5':
jump_pos(4L * DATASIZE() / 8);
draw_screen();
break;
case 0x80 + '6':
jump_pos(5L * DATASIZE() / 8);
draw_screen();
break;
case 0x80 + '7':
jump_pos(6L * DATASIZE() / 8);
draw_screen();
break;
case 0x80 + '8':
jump_pos(7L * DATASIZE() / 8);
draw_screen();
break;
case 0x80 + '9': // Bottom
jump_pos(DATASIZE());
draw_screen();
break;
case 0x80 + 0x08: // OA-Left "Word left"
word_left();
break;
case 0x80 + 0x15: // OA-Right "Word right"
word_right();
break;
case 0x80 + ',': // OA-< "Home"
case 0x80 + '<':
goto_bol();
break;
case 0x80 + '.': // OA-> "End"
case 0x80 + '>':
goto_eol();
break;
case 0x8b: // OA-Up "Page Up"
page_up();
break;
case 0x8a: // OA-Down "Page Down"
page_down();
break;
case 0x80 + 'C': // OA-C "Copy"
case 0x80 + 'c': // OA-c
mode = SEL_COPY;
tmp = (startsel == 65535U ? 0 : 1); // Prev selection active?
endsel = startsel = gapbegin;
if (tmp)
draw_screen();
else
update_status_line();
break;
case 0x80 + 'D': // OA-D "Delete"
case 0x80 + 'd': // OA-d
mode = SEL_DEL;
tmp = (startsel == 65535U ? 0 : 1); // Prev selection active?
endsel = startsel = gapbegin;
if (tmp)
draw_screen();
else
update_status_line();
break;
case 0x80 + 'R': // OA-R "Replace"
case 0x80 + 'r': // OA-r
tmp = 65535U;
case 0x80 + 'F': // OA-F "Find"
case 0x80 + 'f': // OA-F "Find"
++tmp;
sprintf(userentry, "Find (%s)", search);
if (prompt_for_name(userentry, 0) == 255)
break; // ESC pressed
if (strlen(userentry) > 0)
strcpy(search, userentry);
else {
if (strlen(search) == 0)
break;
sprintf(userentry, "Search for '%s' - ", search);
if (!prompt_okay(userentry))
break;
cursor_right();
}
if (tmp == 0) { // Replace mode
sprintf(userentry, "Replace (%s)", replace);
if (prompt_for_name(userentry, 0) == 255)
break; // ESC pressed
if (strlen(userentry) > 0)
strcpy(replace, userentry);
else {
if (strlen(replace) == 0)
break;
sprintf(userentry, "Replace with '%s' - ", replace);
if (!prompt_okay(userentry))
break;
}
}
mode = SRCH1;
update_status_line();
if (search_in_gapbuf(gapend + 1, search, &foundpos) == 0) {
mode = SRCH2;
update_status_line();
set_gapbuf(gapbegin, '\0');
if (search_in_gapbuf(0, search, &foundpos) == 0) {
mode = SRCH3;
update_status_line();
break;
}
mode = SEL_NONE;
jump_pos(foundpos);
if (tmp == 0) { // Replace mode
for (i = 0; i < strlen(search); ++i)
delete_char_right();
for (i = 0; i < strlen(replace); ++i)
insert_char(replace[i]);
}
draw_screen();
break;
}
mode = SEL_NONE;
jump_pos(gapbegin + foundpos - (gapend + 1));
if (tmp == 0) { // Replace mode
for (i = 0; i < strlen(search); ++i)
delete_char_right();
for (i = 0; i < strlen(replace); ++i)
insert_char(replace[i]);
}
draw_screen();
break;
case 0x80 + 'I': // OA-I "Insert file"
case 0x80 + 'i':
if (prompt_for_name("File to insert", 1) == 255)
break; // ESC pressed
if (strlen(userentry) == 0)
break;
if (load_file(userentry, 0))
show_error("Can't open");
draw_screen();
break;
case 0x80 + 'L': // OA-L "Load"
case 0x80 + 'l':
if (prompt_for_name("File to load", 1) == 255)
break; // ESC pressed
if (strlen(userentry) == 0)
break;
jump_pos(0);
pos = 0;
set_modified(0);
startsel = endsel = 65535U;
mode = SEL_NONE;
gapbegin = 0;
gapend = BUFSZ - 1;
strcpy(filename, userentry);
if (load_file(filename, 1)) {
sprintf(userentry, "Can't load %s", filename);
show_error(userentry);
strcpy(filename, "");
}
draw_screen();
break;
case 0x80 + 'M': // OA-M "Move"
case 0x80 + 'm': // OA-m
mode = SEL_MOVE;
tmp = (startsel == 65535U ? 0 : 1); // Prev selection active?
endsel = startsel = gapbegin;
if (tmp)
draw_screen();
else
update_status_line();
break;
case 0x80 + 'N': // OA-N "Name"
case 0x80 + 'n': // OA-n
if (prompt_for_name("New filename", 1) == 255)
break; // ESC pressed
if (strlen(userentry) == 0)
break;
strcpy(filename, userentry);
update_status_line();
break;
case 0x80 + 'Q': // OA-Q "Quit"
case 0x80 + 'q': // OA-q
if (modified)
save();
if (quit_to_email) {
if (prompt_okay("Add attachments - "))
load_attacher();
if (prompt_okay("Quit to EMAIL - "))
load_email();
} else {
if (prompt_okay("Quit to ProDOS - ")) {
revers(0);
clrscr();
exit(0);
}
}
break;
case 0x80 + 'U': // OA-U "Unwrap"
case 0x80 + 'u': // OA-w
word_wrap_para(0);
draw_screen();
break;
case 0x80 + 'W': // OA-W "Wrap"
case 0x80 + 'w': // OA-w
word_wrap_para(1);
draw_screen();
break;
case 0x80 + 'S': // OA-S "Save"
case 0x80 + 's': // OA-s
save();
draw_screen();
break;
case 0x80 + DELETE: // OA-Backspace
case 0x04: // Ctrl-D "DELETE"
if (mode == SEL_NONE) {
delete_char_right();
update_after_delete_char_right();
set_modified(1);
}
break;
case 0x80 + '?': // OA-? "Help"
help();
draw_screen();
break;
case 0x0c: // Ctrl-L "REFRESH"
draw_screen();
break;
case DELETE: // DEL "BACKSPACE"
if (mode == SEL_NONE) {
delete_char();
update_after_delete_char();
set_modified(1);
}
break;
case 0x09: // Tab
if (mode == SEL_NONE) {
c = next_tabstop(curscol) - curscol;
for (i = 0; i < c; ++i) {
insert_char(' ');
update_after_insert_char();
}
set_modified(1);
}
break;
case 0x08: // Left
cursor_left();
break;
case 0x15: // Right
cursor_right();
break;
case 0x0b: // Up
cursor_up();
break;
case 0x0a: // Down
cursor_down();
break;
case EOL: // Return
if (mode == SEL_NONE) {
insert_char(c);
update_after_insert_char();
set_modified(1);
} else {
if (startsel > endsel) {
tmp = endsel;
endsel = startsel;
startsel = tmp;
}
switch (mode) {
case SEL_DEL:
mode = SEL_DEL2;
if (prompt_okay("Delete selection - ")) {
jump_pos(startsel);
gapend += (endsel - startsel);
}
startsel = endsel = 65535U;
mode = SEL_NONE;
set_modified(1);
draw_screen();
break;
case SEL_COPY:
mode = SEL_COPY2;
update_status_line();
break;
case SEL_MOVE:
mode = SEL_MOVE2;
update_status_line();
break;
case SEL_COPY2:
case SEL_MOVE2:
if ((gapbegin > startsel) && (gapbegin < endsel)) {
show_error("Bad destination");
goto copymove2_cleanup;
}
if ((endsel - startsel) > FREESPACE()) {
show_error("No space");
goto copymove2_cleanup;
}
sprintf(userentry, "%s selection - ", mode == SEL_COPY2 ? "Copy" : "Move");
if (prompt_okay(userentry)) {
if (gapbegin >= endsel)
move_in_gapbuf(gapbegin, startsel, endsel - startsel);
else
move_in_gapbuf(gapbegin,
gapend + startsel - gapbegin + 1,
endsel - startsel);
gapbegin += (endsel - startsel);
if (mode == SEL_MOVE2) {
jump_pos((gapbegin >= endsel) ? startsel : endsel);
gapend += (endsel - startsel);
}
}
copymove2_cleanup:
startsel = endsel = 65535U;
mode = SEL_NONE;
set_modified(1);
draw_screen();
break;
}
}
break;
default:
//printf("**%02x**", c);
if ((c >= 0x20) && (c < 0x80) && (mode == SEL_NONE)) {
insert_char(c);
update_after_insert_char();
set_modified(1);
}
}
}
}
void main(int argc, char *argv[]) {
#ifdef AUXMEM
char *pad = 0xbfff;
*pad = '\0'; // Null termination for strstr()
#endif
if (argc == 2) {
quit_to_email = 1;
edit(argv[1]);
} else {
quit_to_email = 0;
edit(NULL);
}
}
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