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musl-tcc/tests/pico.c

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/*
* This file is not a part of musl-tcc,but a standalone editor which
* is used to check the usability of musl-tcc
*/
/*** includes ***/
// feature test macro ??
#define _DEFAULT_SOURCE
#define _BSD_SOURCE
#define _GNU_SOURCE
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h> // Input/Output ConTroL
#include <sys/types.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
/*** defines ***/
// Cool ascii thing, clearing bits 5 and 6 gets the control sequence associated with that character
// Also bit five toggles lowercase and uppercase
#define CTRL_KEY(k) ((k) & 0x1f)
#define PICO_VERSION "0.0.1"
#define PICO_TAB_STOP 8
#define PICO_QUIT_TIMES 3
enum EditorKey {
BACKSPACE = 127,
ARROW_LEFT = 1000,
ARROW_RIGHT,
ARROW_UP,
ARROW_DOWN,
DEL_KEY,
HOME_KEY,
END_KEY,
PAGE_UP,
PAGE_DOWN,
};
enum EditorHighlight {
HL_NORMAL = 0,
HL_COMMENT,
HL_MLCOMMENT,
HL_KEYWORD1,
HL_KEYWORD2,
HL_STRING,
HL_NUMBER,
HL_MATCH
};
#define HL_HIGHLIGHT_NUMBERS (1<<0)
#define HL_HIGHLIGHT_STRINGS (1<<1)
/*** data ***/
typedef struct {
char* filetype;
char** filematch;
char** keywords;
char* singleline_comment_start;
char* multiline_comment_start;
char* multiline_comment_end;
int flags;
} EditorSyntax;
typedef struct {
int idx;
int size;
int rsize; // The size of the render of the row (tabs are more than one character)
char *chars;
char *render;
unsigned char* hl; // Highlight
int hl_open_comment;
} Row;
struct EditorConfig {
int cx, cy;
int rx; // index into the render field
int rowoff;
int coloff;
int screenrows;
int screencols;
int numrows;
Row *row;
int dirty;
char *filename;
char statusmsg[80];
time_t statusmsg_time;
EditorSyntax* syntax;
struct termios orig_termios;
};
struct EditorConfig E;
/*** filetypes ***/
char* C_HL_extensions[] = { ".c", ".h", ".cpp", NULL };
char* C_HL_keywords[] = {
"switch", "if", "while", "for", "break", "continue", "return", "else", "struct", "union", "typedef", "static", "enum", "case",
"int|", "long|", "double|", "float|", "char|", "float|", "unsigned|", "signed|", "void|", NULL
};
EditorSyntax HLDB[] = {
{
"c",
C_HL_extensions,
C_HL_keywords,
"//", "/*", "*/",
HL_HIGHLIGHT_NUMBERS | HL_HIGHLIGHT_STRINGS
}
};
// HighLight DataBase Entries
#define HLDB_ENTRIES (sizeof(HLDB) / sizeof(HLDB[0]))
/*** prototypes ***/
/* c was meant to be compiled in a single pass */
void editor_set_status_message(const char *fmt, ...);
void editor_refresh_screen();
char* editor_prompt(char* prompt, void (*callback)(char*, int));
/*** terminal ***/
void die(const char *s) {
// Clear screen
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3);
// Most libc functions that fail set the global errno variable to indicate what the error was.
// `perror` looks at errno and prints a descriptive error message for it.
// It also prints the given string.
perror(s);
// Exit with status of 1, indicating error, like an non-zero exit code.
exit(1);
}
void disable_raw_mode() {
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == -1)
die("tcsetattr");
}
void enable_raw_mode() {
if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1)
die("tcgetattr");
atexit(disable_raw_mode);
struct termios raw = E.orig_termios;
// Flags documented with * are usually already off and/or don't apply, but good practices
// IXON: When on enables C-s and C-q, which involve "software control flow".
// stands for input XON because C-s and C-q are XON and XOFF.
// ICRNL: When on enables coercing a \r without a \n to a \n (C-m is \r and C-j is \n).
// stands for input carriage return new line.
// *BRKINT: When on a "break condition" will cause a SIGINT signal to be sent.
// *INPCK: When on enables parity checking, which doesn't seem to apply to modern terminal emulators.
// *ISTRIP: When on enables causes the high bit to be 0 for every input byte.
raw.c_iflag &= ~(IXON | ICRNL | BRKINT | INPCK | ISTRIP);
// OPOST: When on enables output processing, in reality the only feature would be coercing \n into \r\n.
// This means whenever we want a new line we have to do \r\n, otherwise the cursor will not
// go to the start of the line and will just move down.
raw.c_oflag &= ~(OPOST);
// *CS8: not a flag, a mask. Sets the character size to 8=bits per bytes, lmao, imagine needing this.
raw.c_cflag |= (CS8);
// ECHO: When on enables echoing back of input.
// ICANON: When on enables reading line by line (we want it byte by byte).
// ISIG: When on enables SIGINT and SIGTSTP from C-c and C-z, respectively.
// these are signal interrupt and signal temporary stop.
// IEXTEN: When on enables C-v to send another character "literally" (e.g. C-v and C-c would only send a literal 3 and not SIGINT).
raw.c_lflag &= ~(ECHO | ICANON | ISIG | IEXTEN);
// cc stands for control characters
// Both measured in tenths of a second.
// Minimum amount of time before read returns.
raw.c_cc[VMIN] = 0;
// Maximum amount of time to wait before read returns.
// On time out read() returns 0.
raw.c_cc[VTIME] = 1;
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
die("tcsetattr");
}
int editor_read_key() {
// read in character
int nread;
char c;
while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
if (nread == -1 && errno != EAGAIN)
die("read");
}
// Process character if escape character
if (c == '\x1b') {
char seq[3];
if (read(STDIN_FILENO, &seq[0], 1) != 1) return '\x1b';
if (read(STDIN_FILENO, &seq[1], 1) != 1) return '\x1b';
if (seq[0] == '[') {
if (seq[1] >= '0' && seq[1] <= '9') {
if (read(STDIN_FILENO, &seq[2], 1) != 1) return '\x1b';
if (seq[2] == '~') {
switch (seq[1]) {
case '1': return HOME_KEY;
case '3': return DEL_KEY;
case '4': return END_KEY;
case '5': return PAGE_UP;
case '6': return PAGE_DOWN;
case '7': return HOME_KEY;
case '8': return END_KEY;
}
}
} else {
switch (seq[1]) {
case 'A': return ARROW_UP;
case 'B': return ARROW_DOWN;
case 'C': return ARROW_RIGHT;
case 'D': return ARROW_LEFT;
case 'H': return HOME_KEY;
case 'F': return END_KEY;
}
}
} else if (seq[0] == 'O') {
switch (seq[1]) {
case 'H': return HOME_KEY;
case 'F': return END_KEY;
}
}
return '\x1b';
} else {
return c;
}
}
int get_cursor_position(int *rows, int *cols) {
char buf[32];
unsigned int i = 0;
if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4)
return -1;
while (i < sizeof(buf) -1) {
if (read(STDIN_FILENO, &buf[i], 1) != 1)
break;
if (buf[i] == 'R')
break;
i++;
}
// printf expected a null byte at the end
buf[i] = '\0';
if (buf[0] != '\x1b' || buf[1] != '[')
return -1;
if (sscanf(&buf[2], "%d;%d", rows, cols) != 2)
return -1;
return 0;
}
int get_window_size(int *rows, int *cols) {
struct winsize ws;
// Terminal IOCtl Get Window Size
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12)
return -1;
return get_cursor_position(rows, cols);
} else {
*cols = ws.ws_col;
*rows = ws.ws_row;
return 0;
}
}
/*** syntax highlighting ***/
int is_separator(int c) {
return isspace(c) || c == '\0' || strchr(",.()+-/*=~%<>[];", c) != NULL;
}
void editor_update_syntax(Row* row) {
row->hl = realloc(row->hl, row->rsize);
memset(row->hl, HL_NORMAL, row->rsize);
if (E.syntax == NULL)
return;
char** keywords = E.syntax->keywords;
char* scs = E.syntax->singleline_comment_start;
char* mcs = E.syntax->multiline_comment_start;
char* mce = E.syntax->multiline_comment_end;
int scs_len = scs ? strlen(scs) : 0;
int mcs_len = scs ? strlen(mcs) : 0;
int mce_len = scs ? strlen(mce) : 0;
int prev_sep = 1;
int in_string = 0;
int in_comment = (row->idx > 0 && E.row[row->idx - 1].hl_open_comment);
int i = 0;
while (i < row->rsize) {
char c = row->render[i];
unsigned char prev_hl = (i > 0) ? row->hl[i - 1] : HL_NORMAL;
if (scs_len && !in_string && !in_comment) {
if (!strncmp(&row->render[i], scs, scs_len)) {
memset(&row->hl[i], HL_COMMENT, row->rsize - i);
break;
}
}
if (mcs_len && mce_len && !in_string) {
if (in_comment) {
row->hl[i] = HL_MLCOMMENT;
if (!strncmp(&row->render[i], mce, mce_len)) {
memset(&row->hl[i], HL_MLCOMMENT, mce_len);
i += mce_len;
in_comment = 0;
prev_sep = 1;
continue;
} else {
i++;
continue;
}
} else if (!strncmp(&row->render[i], mcs, mcs_len)) {
memset(&row->hl[i], HL_MLCOMMENT, mcs_len);
i += mcs_len;
in_comment = 1;
continue;
}
}
if (E.syntax->flags & HL_HIGHLIGHT_STRINGS) {
if (in_string) {
row->hl[i] = HL_STRING;
// backslash escapes strings
if (c == '\\' && i + 1 < row->rsize) {
row->hl[i + 1] = HL_STRING;
i += 2;
continue;
}
if (c == in_string)
in_string = 0;
i++;
prev_sep = 1;
continue;
} else {
if (c == '"' || c == '\'') {
in_string = c;
row->hl[i] = HL_STRING;
i++;
continue;
}
}
}
if (E.syntax->flags & HL_HIGHLIGHT_NUMBERS) {
if ( (isdigit(c) && (prev_sep || prev_hl == HL_NUMBER)) ||
(c == '.' && prev_hl == HL_NUMBER)
) {
row->hl[i] = HL_NUMBER;
i++;
prev_sep = 0;
continue;
}
}
if (prev_sep) {
int j;
for (j = 0; keywords[j]; j++) {
int klen = strlen(keywords[j]);
int kw2 = keywords[j][klen-1] == '|';
if (kw2)
klen--;
if (
!strncmp(&row->render[i], keywords[j], klen) &&
is_separator(row->render[i + klen])
) {
memset(&row->hl[i], kw2 ? HL_KEYWORD2 : HL_KEYWORD1, klen);
i += klen;
// this break gets us to the if statement to continue
break;
}
}
// Triggered on break
if (keywords[j] != NULL) {
prev_sep = 0;
continue;
}
}
prev_sep = is_separator(c);
i++;
}
// update next rows if this line has the start of a multiline comment
int changed = (row->hl_open_comment != in_comment);
row->hl_open_comment = in_comment;
if (changed && row->idx + 1 < E.numrows)
editor_update_syntax(&E.row[row->idx + 1]);
}
int editor_syntax_to_color(int hl) {
switch (hl) {
case HL_COMMENT:
case HL_MLCOMMENT: return 36;
case HL_STRING: return 35;
case HL_KEYWORD1: return 33;
case HL_KEYWORD2: return 32;
case HL_NUMBER: return 31;
case HL_MATCH: return 34;
default: return 37;
}
}
void editor_select_syntax_highlight() {
E.syntax = NULL;
if (E.filename == NULL)
return;
char* ext = strrchr(E.filename, '.');
for (unsigned int j = 0; j < HLDB_ENTRIES; j++) {
EditorSyntax* s = &HLDB[j];
unsigned int i = 0;
while (s->filematch[i]) {
int is_ext = (s->filematch[i][0] == '.');
if (
(is_ext && ext && !strcmp(ext, s->filematch[i])) ||
(!is_ext && strstr(E.filename, s->filematch[i]))
) {
E.syntax = s;
int filerow;
for (filerow = 0; filerow < E.numrows; filerow++) {
editor_update_syntax(&E.row[filerow]);
}
return;
}
i++;
}
}
}
/*** row operations ***/
int editor_row_cx_to_rx(Row *row, int cx) {
int rx = 0;
int j;
for (j = 0; j < cx; j++) {
if (row->chars[j] == '\t')
rx += (PICO_TAB_STOP - 1) - (rx % PICO_TAB_STOP);
rx++;
}
return rx;
}
int editor_row_rx_to_cx(Row* row, int rx) {
int cur_rx = 0;
int cx;
for (cx = 0; cx < row->size; cx++) {
if (row->chars[cx] == '\t') {
cur_rx += (PICO_TAB_STOP - 1) - (cur_rx % PICO_TAB_STOP);
}
cur_rx++;
if (cur_rx > rx)
return cx;
}
return cx;
}
void editor_update_row(Row* row) {
// used for iteration twice
int j;
int tabs = 0;
for (j = 0; j < row->size; j++)
if (row->chars[j] == '\t')
tabs++;
free(row->render);
row->render = malloc(row->size + tabs * (PICO_TAB_STOP - 1) + 1);
int idx = 0;
for (j = 0; j < row->size; j++) {
if (row->chars[j] == '\t') {
row->render[idx++] = ' ';
// get us to the next tab spot
while (idx % PICO_TAB_STOP != 0) row->render[idx++] = ' ';
} else {
row->render[idx++] = row->chars[j];
}
}
row->render[idx] = '\0';
row->rsize = idx;
editor_update_syntax(row);
}
void editor_insert_row(int at, char* s, size_t len) {
if (at < 0 || at > E.numrows)
return;
// Allocate space for the new row
E.row = realloc(E.row, sizeof(Row) * (E.numrows + 1));
memmove(&E.row[at + 1], &E.row[at], sizeof(Row) * (E.numrows - at));
for (int j = at + 1; j <= E.numrows; j++)
E.row[j].idx++;
E.row[at].idx = at;
E.row[at].size = len;
E.row[at].chars = malloc(len + 1);
memcpy(E.row[at].chars, s, len);
E.row[at].chars[len] = '\0';
E.row[at].rsize = 0;
E.row[at].render = NULL;
E.row[at].hl = NULL;
E.row[at].hl_open_comment = 0;
editor_update_row(&E.row[at]);
E.numrows++;
E.dirty++;
}
void editor_free_row(Row* row) {
free(row->render);
free(row->chars);
free(row->hl);
}
void editor_del_row(int at) {
if (at < 0 || at >= E.numrows)
return;
editor_free_row(&E.row[at]);
memmove(&E.row[at], &E.row[at + 1], sizeof(Row) * (E.numrows - at - 1));
for (int j = at; j < E.numrows - 1; j++)
E.row[j].idx--;
E.numrows--;
E.dirty++;
}
void editor_row_insert_char(Row* row, int at, int c) {
if (at < 0 || at > row->size)
at = row->size;
// allocate one more byte for the new character, and one more byte for the null byte
row->chars = realloc(row->chars, row->size + 2);
// like memcpy, but safe to use if the source and destination places overlap
memmove(&row->chars[at + 1], &row->chars[at], row->size - at + 1);
row->size++;
row->chars[at] = c;
editor_update_row(row);
E.dirty++;
}
void editor_row_append_string(Row* row, char* s, size_t len) {
row->chars = realloc(row->chars, row->size + len + 1);
memcpy(&row->chars[row->size], s, len);
row->size += len;
row->chars[row->size] = '\0';
editor_update_row(row);
E.dirty++;
}
void editor_row_del_char(Row* row, int at) {
if (at < 0 || at >= row->size)
return;
// include the NULL byte!
memmove(&row->chars[at], &row->chars[at + 1], row->size - at);
row->size--;
editor_update_row(row);
E.dirty++;
}
/*** editor operations ***/
void editor_insert_char(int c) {
if (E.cy == E.numrows) {
editor_insert_row(E.numrows, "", 0);
}
editor_row_insert_char(&E.row[E.cy], E.cx, c);
E.cx++;
}
void editor_insert_newline() {
if (E.cx == 0) {
editor_insert_row(E.cy, "", 0);
} else {
Row* row = &E.row[E.cy];
editor_insert_row(E.cy + 1, &row->chars[E.cx], row->size - E.cx);
// Reassign because memmove might invalidate it (uhhhhh)
row = &E.row[E.cy];
row->size = E.cx;
row->chars[row->size] = '\0';
editor_update_row(row);
}
E.cy++;
E.cx = 0;
}
void editor_del_char() {
if (E.cy == E.numrows)
return;
if (E.cx == 0 && E.cy == 0)
return;
Row* row = &E.row[E.cy];
if (E.cx > 0) {
editor_row_del_char(row, E.cx - 1);
E.cx--;
} else {
E.cx = E.row[E.cy - 1].size;
editor_row_append_string(&E.row[E.cy - 1], row->chars, row->size);
editor_del_row(E.cy);
E.cy--;
}
}
/*** file i/o ***/
// Returns a string of all the rows
// also modifies buflen to be the length of the string
char* editor_rows_to_string(int* buflen) {
int totlen = 0;
int j;
for (j = 0; j < E.numrows; j++) {
totlen += E.row[j].size + 1;
}
*buflen = totlen;
char* buf = malloc(totlen);
char* p = buf;
for (j = 0; j < E.numrows; j++) {
memcpy(p, E.row[j].chars, E.row[j].size);
p += E.row[j].size;
*p = '\n';
p++;
}
return buf;
}
void editor_open(char *filename) {
free(E.filename);
E.filename = strdup(filename);
editor_select_syntax_highlight();
FILE *fp = fopen(filename, "r");
if (!fp) die("fopen");
char *line = NULL;
size_t linecap = 0; // This type is used for sizes of objects
ssize_t linelen; // This type is used for indicating errors (and also success ig)
// Read line from file into `line` into buffer of current size `linecap` from `fp`.
while ((linelen = getline(&line, &linecap, fp)) != -1) {
// strip \r and \n
while (linelen > 0 && (line[linelen - 1] == '\n' || line[linelen - 1] == '\r'))
linelen--;
editor_insert_row(E.numrows, line, linelen);
}
free(line);
fclose(fp);
E.dirty = 0;
}
void editor_save() {
if (E.filename == NULL) {
E.filename = editor_prompt("Save as: %s", NULL);
if (E.filename == NULL) {
editor_set_status_message("Save aborted");
return;
}
editor_select_syntax_highlight();
}
int len;
char* buf = editor_rows_to_string(&len);
// 0644 is file perms, user read/write, group read
int fd = open(E.filename, O_RDWR | O_CREAT, 0644);
if (fd != -1) {
// will cut off excess, or add 0 until file is of length len
// by using ftruncate and not the O_TRUNC flag for open() (which automatically clears the file)
// we keep the old file if the write fails, but the open doesn't
// If we were cooler, we'd write to another file, and only if everything is good, rename it
if (ftruncate(fd, len) != 1) {
if (write(fd, buf, len) == len) {
close(fd);
free(buf);
E.dirty = 0;
editor_set_status_message("%d bytes written to disk", len);
return;
}
}
close(fd);
}
free(buf);
editor_set_status_message("Can't save! I/O error: %s", strerror(errno));
}
/*** find ***/
void editor_find_callback(char* query, int key) {
static int last_match = -1;
static int direction = 1;
static int saved_hl_line;
static char* saved_hl = NULL;
if (saved_hl) {
memcpy(E.row[saved_hl_line].hl, saved_hl, E.row[saved_hl_line].rsize);
free(saved_hl);
saved_hl = NULL;
}
if (key == '\r' || key == '\x1b') {
last_match = -1;
direction = 1;
return;
} else if (key == ARROW_RIGHT || key == ARROW_DOWN) {
direction = 1;
} else if (key == ARROW_LEFT || key == ARROW_UP) {
direction = -1;
} else {
last_match = -1;
direction = 1;
}
if (last_match == -1)
direction = 1;
int current = last_match;
int i;
for (i = 0; i < E.numrows; i++) {
// start from last match and wrap around
current += direction;
if (current == -1)
current = E.numrows - 1;
else if (current == E.numrows)
current = 0;
Row* row = &E.row[current];
char* match = strstr(row->render, query);
if (match) {
last_match = current;
E.cy = current;
E.cx = editor_row_rx_to_cx(row, match - row->render);
E.rowoff = E.numrows;
saved_hl_line = current;
saved_hl = malloc(row->rsize);
memcpy(saved_hl, row->hl, row->rsize);
memset(&row->hl[match - row->render], HL_MATCH, strlen(query));
break;
}
}
}
void editor_find() {
int saved_cx = E.cx;
int saved_cy = E.cy;
int saved_coloff = E.coloff;
int saved_rowoff = E.rowoff;
char* query = editor_prompt("Search: %s", editor_find_callback);
if (query) {
free(query);
} else {
E.cx = saved_cx;
E.cy = saved_cy;
E.coloff = saved_coloff;
E.rowoff = saved_rowoff;
}
}
/*** append buffer ***/
// Avoid many small calls to write
typedef struct {
char *b;
int len;
} AppendBuf;
#define ABUF_INIT {NULL, 0}
void ab_append(AppendBuf *ab, const char *s, int len) {
char *new = realloc(ab->b, ab->len + len);
if (new == NULL)
return;
memcpy(&new[ab->len], s, len);
ab->b = new;
ab->len += len;
}
void abFree(AppendBuf *ab) {
free(ab->b);
}
/*** input ***/
// callback function called after every keypress
char* editor_prompt(char* prompt, void (*callback)(char*, int)) {
size_t bufsize = 128;
char* buf = malloc(bufsize);
size_t buflen = 0;
buf[0] = '\0';
for (;;) {
editor_set_status_message(prompt, buf);
editor_refresh_screen();
int c = editor_read_key();
if (c == DEL_KEY || c == CTRL_KEY('h') || c == BACKSPACE) {
if (buflen != 0)
buf[--buflen] = '\0';
} else if (c == '\x1b') {
// escape
editor_set_status_message("");
if (callback)
callback(buf, c);
free(buf);
return NULL;
} else if (c == '\r') {
if (buflen != 0) {
editor_set_status_message("");
if (callback)
callback(buf, c);
return buf;
}
} else if (!iscntrl(c) && c < 128) {
if (buflen == bufsize - 1) {
bufsize *= 2;
buf = realloc(buf, bufsize);
}
buf[buflen++] = c;
buf[buflen] = '\0';
}
if (callback)
callback(buf, c);
}
}
void editor_move_cursor(int key) {
Row *row = (E.cy >= E.numrows) ? NULL : &E.row[E.cy];
switch (key) {
case ARROW_LEFT:
if (E.cx != 0) {
E.cx--;
} else if (E.cy > 0) {
E.cy--;
E.cx = E.row[E.cy].size;
}
break;
case ARROW_RIGHT:
if (row && E.cx < row->size) {
E.cx++;
} else if (row && E.cx == row->size) {
E.cy++;
E.cx = 0;
}
break;
case ARROW_UP:
if (E.cy != 0) {
E.cy--;
}
break;
case ARROW_DOWN:
if (E.cy < E.numrows) {
E.cy++;
}
break;
}
// Correct row if we moved down/up to a row that was shorter
row = (E.cy >= E.numrows) ? NULL : &E.row[E.cy];
int rowlen = row ? row->size : 0;
if (E.cx > rowlen) {
E.cx = rowlen;
}
}
void editor_process_keypress() {
static int quit_times = PICO_QUIT_TIMES;
int c = editor_read_key();
switch (c) {
case '\r':
editor_insert_newline();
break;
case CTRL_KEY('q'):
if (E.dirty && quit_times > 0) {
editor_set_status_message("WARNING!!! File has unsaved changes. "
"Press Ctrl-Q %d more times to quit.", quit_times);
quit_times--;
// We return so that the quit number reset at the end of the function
// doesn't happen
return;
}
// Clear screen
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3);
// exit
exit(0);
break;
case CTRL_KEY('s'):
editor_save();
break;
case HOME_KEY:
E.cx = 0;
break;
case END_KEY:
if (E.cy < E.numrows)
E.cx = E.row[E.cy].size;
break;
case CTRL_KEY('f'):
editor_find();
break;
case BACKSPACE:
case CTRL_KEY('h'):
case DEL_KEY:
if (c == DEL_KEY)
editor_move_cursor(ARROW_RIGHT);
editor_del_char();
break;
case PAGE_UP:
case PAGE_DOWN:
// Create code block so that we can delcare a variable
{
if (c == PAGE_UP) {
E.cy = E.rowoff;
} else if (c == PAGE_DOWN) {
E.cy = E.rowoff + E.screenrows - 1;
if (E.cy > E.numrows) E.cy = E.numrows;
}
int times = E.screenrows;
while (times--)
editor_move_cursor(c == PAGE_UP ? ARROW_UP : ARROW_DOWN);
}
break;
case ARROW_LEFT:
case ARROW_RIGHT:
case ARROW_UP:
case ARROW_DOWN:
editor_move_cursor(c);
break;
case CTRL_KEY('l'):
case '\x1b':
break;
default:
editor_insert_char(c);
break;
}
quit_times = PICO_QUIT_TIMES;
}
/*** output ***/
void editor_scroll() {
E.rx = 0;
if (E.cy < E.numrows) {
E.rx = editor_row_cx_to_rx(&E.row[E.cy], E.cx);
}
if (E.cy < E.rowoff) {
E.rowoff = E.cy;
}
if (E.cy >= E.rowoff + E.screenrows) {
E.rowoff = E.cy - E.screenrows + 1;
}
if (E.rx < E.coloff) {
E.coloff = E.rx;
}
if (E.rx >= E.coloff + E.screencols) {
E.coloff = E.rx - E.screencols + 1;
}
}
void editor_draw_rows(AppendBuf *ab) {
int y;
for (y = 0; y < E.screenrows; y++) {
int filerow = y + E.rowoff;
// I think the tutorial as `>=` here but it drew an extra tilde for me and now it just
// has a blank line for appending a line to the file which is much better.
// Is this undefined behavior or correct code ?!?!
// It was UB... the bug is still here... Only crashes with no file input
if (filerow >= E.numrows) {
if (E.numrows == 0 && filerow == E.screenrows / 3) {
// Create welcome message
char welcome[80];
int welcomelen = snprintf(welcome, sizeof(welcome), "Pico editor -- version %s", PICO_VERSION);
if (welcomelen > E.screencols) welcomelen = E.screencols;
// Add padding
int padding = (E.screencols - welcomelen) / 2;
if (padding) {
ab_append(ab, "~", 1);
padding--;
}
while (padding--)
ab_append(ab, " ", 1);
ab_append(ab, welcome, welcomelen);
// THIS SEEMED TO FIX IT!!!!!
// used to just be else
} else if (E.numrows == 0 || filerow == E.screenrows) {
ab_append(ab, "~", 1);
}
} else {
// Otherwise print the text at the yth row
int len = E.row[filerow].rsize - E.coloff;
if (len < 0)
len = 0;
if (len > E.screencols)
len = E.screencols;
char* c = &E.row[filerow].render[E.coloff];
unsigned char* hl = &E.row[filerow].hl[E.coloff];
// -1 indicates the default color
int current_color = -1;
int j;
for (j = 0; j < len; j++) {
if (iscntrl(c[j])) {
// Non-printable characters
// Capital letters come after the '@' character
char sym = (c[j] <= 26) ? '@' + c[j] : '?';
// invert colors for printing
ab_append(ab, "\x1b[7m", 4);
ab_append(ab, &sym, 1);
ab_append(ab, "\x1b[m", 3);
if (current_color != -1) {
char buf[16];
int clen = snprintf(buf, sizeof(buf), "\x1b[%dm", current_color);
ab_append(ab, buf, clen);
}
} else if (hl[j] == HL_NORMAL) {
if (current_color != -1) {
ab_append(ab, "\x1b[39m", 5);
current_color = -1;
}
ab_append(ab, &c[j], 1);
} else {
int color = editor_syntax_to_color(hl[j]);
if (color != current_color) {
current_color = color;
char buf[16];
int clen = snprintf(buf, sizeof(buf), "\x1b[%dm", color);
ab_append(ab, buf, clen);
}
ab_append(ab, &c[j], 1);
}
}
ab_append(ab, "\x1b[39m", 5);
}
ab_append(ab, "\x1b[K", 3);
ab_append(ab, "\r\n", 2);
}
}
void editor_draw_status_bar(AppendBuf *ab) {
// inverted colors
ab_append(ab, "\x1b[7m", 4);
char status[80], rstatus[80];
int len = snprintf(status, sizeof(status), "%.20s - %d lines %s",
E.filename ? E.filename : "[No Name]",
E.numrows,
E.dirty ? "(modified)" : "");
int rlen = snprintf(rstatus, sizeof(rstatus), "%s | %d/%d",
E.syntax ? E.syntax->filetype : "no ft",
E.cy + 1,
E.numrows);
if (len > E.screencols) len = E.screencols;
ab_append(ab, status, len);
// Fill with spaces until right aligned line numbers
while (len < E.screencols) {
if (E.screencols - len == rlen) {
ab_append(ab, rstatus, rlen);
break;
} else {
ab_append(ab, " ", 1);
len++;
}
}
// normal text formatting
ab_append(ab, "\x1b[m", 3);
ab_append(ab, "\r\n", 2);
}
void editor_draw_message_bar(AppendBuf *ab) {
ab_append(ab, "\x1b[K", 3);
int msglen = strlen(E.statusmsg);
if (msglen > E.screencols) msglen = E.screencols;
if (msglen && time(NULL) - E.statusmsg_time < 5)
ab_append(ab, E.statusmsg, msglen);
}
void editor_refresh_screen() {
editor_scroll();
AppendBuf ab = ABUF_INIT;
// Hide the cursor
ab_append(&ab, "\x1b[?25l", 6);
// 0x1b is 27 in hexidecimal which is the escape character
// the other three bytes are "[2j"
// Escape sequences start with an escape character (\x1b)
// and then '['. They instruct the terminal to do various things.
// 'J' is erase and '2' means to erase the entire screen (0 is default argument).
// `ab_append(&ab, "\x1b[2J", 4);`
// The 3 means write four bytes
// 'H' is the cursor position command.
// takes 2 arguments we could use "\x1b[12;40H" to move the curosr to the 12th row and 40th col
// multiple arguments are separated by a ';'. Default arguments are 1 and 1.
ab_append(&ab, "\x1b[H", 3);
editor_draw_rows(&ab);
editor_draw_status_bar(&ab);
editor_draw_message_bar(&ab);
// move cursor
char buf[32];
snprintf(buf, sizeof(buf), "\x1b[%d;%dH", (E.cy - E.rowoff) + 1, (E.rx - E.coloff) + 1);
ab_append(&ab, buf, strlen(buf));
// Show the cursor
ab_append(&ab, "\x1b[?25h", 6);
write(STDOUT_FILENO, ab.b, ab.len);
abFree(&ab);
}
// This is how you do variable arguments in C, this is now a "variadic function"
// All the cool va shit comes from <stdarg.h>
// printf comes from <stdio.h> and time, obviously <time.h>
void editor_set_status_message(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
vsnprintf(E.statusmsg, sizeof(E.statusmsg), fmt, ap);
va_end(ap);
E.statusmsg_time = time(NULL);
}
/*** init ***/
void editor_init() {
E.cx = 0;
E.cy = 0;
E.rx = 0;
E.rowoff = 0;
E.coloff = 0;
E.numrows = 0;
E.row = NULL;
E.dirty = 0;
E.filename = NULL;
E.statusmsg[0] = '\0';
E.statusmsg_time = 0;
E.syntax = NULL;
if (get_window_size(&E.screenrows, &E.screencols) == -1)
die("get_window_size");
E.screenrows -= 2;
}
int main(int arc, char *argv[]) {
enable_raw_mode();
editor_init();
if (arc >= 2) {
editor_open(argv[1]);
}
editor_set_status_message("HELP: Ctrl-S to save | Ctrl-Q to quit | Ctrl-F to find");
for (;;) {
editor_refresh_screen();
editor_process_keypress();
}
return 0;
}
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