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/* See LICENSE for licence details. */
#define _XOPEN_SOURCE 600
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <locale.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/Xutil.h>
/* Arbitrary sizes */
#define ESC_TITLE_SIZ 256
#define ESC_BUF_SIZ 256
#define ESC_ARG_SIZ 16
#define DRAW_BUF_SIZ 1024
#define SERRNO strerror(errno)
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) < (b) ? (b) : (a))
#define LEN(a) (sizeof(a) / sizeof(a[0]))
#define DEFAULT(a, b) (a) = (a) ? (a) : (b)
#define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
#define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
#define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
#define IS_SET(flag) (term.mode & flag)
/* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE, CURSOR_DRAW,
CURSOR_SAVE, CURSOR_LOAD };
enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
enum { SCREEN_UPDATE, SCREEN_REDRAW };
typedef struct {
char c; /* character code */
char mode; /* attribute flags */
int fg; /* foreground */
int bg; /* background */
char state; /* state flags */
} Glyph;
typedef Glyph* Line;
typedef struct {
Glyph attr; /* current char attributes */
int x;
int y;
} TCursor;
/* CSI Escape sequence structs */
/* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
typedef struct {
char buf[ESC_BUF_SIZ]; /* raw string */
int len; /* raw string length */
char priv;
int arg[ESC_ARG_SIZ];
int narg; /* nb of args */
char mode;
} CSIEscape;
/* Internal representation of the screen */
typedef struct {
int row; /* nb row */
int col; /* nb col */
Line* line; /* screen */
TCursor c; /* cursor */
char hidec;
int top; /* top scroll limit */
int bot; /* bottom scroll limit */
int mode; /* terminal mode flags */
int esc; /* escape state flags */
char title[ESC_TITLE_SIZ];
int titlelen;
} Term;
/* Purely graphic info */
typedef struct {
Display* dis;
Window win;
Pixmap buf;
int scr;
int w; /* window width */
int h; /* window height */
int bufw; /* pixmap width */
int bufh; /* pixmap height */
int ch; /* char height */
int cw; /* char width */
} XWindow;
typedef struct {
KeySym k;
char s[ESC_BUF_SIZ];
} Key;
/* Drawing Context */
typedef struct {
unsigned long col[256];
XFontStruct* font;
XFontStruct* bfont;
GC gc;
} DC;
#include "config.h"
static void die(const char *errstr, ...);
static void draw(int);
static void execsh(void);
static void sigchld(int);
static void run(void);
static void csidump(void);
static void csihandle(void);
static void csiparse(void);
static void csireset(void);
static void tclearregion(int, int, int, int);
static void tcursor(int);
static void tdeletechar(int);
static void tdeleteline(int);
static void tinsertblank(int);
static void tinsertblankline(int);
static void tmoveto(int, int);
static void tnew(int, int);
static void tnewline(void);
static void tputtab(void);
static void tputc(char);
static void tputs(char*, int);
static void treset(void);
static void tresize(int, int);
static void tscroll(void);
static void tscrollup(int);
static void tscrolldown(int);
static void tsetattr(int*, int);
static void tsetchar(char);
static void tsetscroll(int, int);
static void ttynew(void);
static void ttyread(void);
static void ttyresize(int, int);
static void ttywrite(const char *, size_t);
static void xbell(void);
static void xdraws(char *, Glyph, int, int, int);
static void xhints(void);
static void xclear(int, int, int, int);
static void xcursor(int);
static void xinit(void);
static void xloadcols(void);
static void expose(XEvent *);
static char* kmap(KeySym);
static void kpress(XEvent *);
static void resize(XEvent *);
static void (*handler[LASTEvent])(XEvent *) = {
[KeyPress] = kpress,
[Expose] = expose,
[ConfigureNotify] = resize
};
/* Globals */
static DC dc;
static XWindow xw;
static Term term;
static CSIEscape escseq;
static int cmdfd;
static pid_t pid;
static int running;
#ifdef DEBUG
void
tdump(void) {
int row, col;
Glyph c;
for(row = 0; row < term.row; row++) {
for(col = 0; col < term.col; col++) {
if(col == term.c.x && row == term.c.y)
putchar('#');
else {
c = term.line[row][col];
putchar(c.state & GLYPH_SET ? c.c : '.');
}
}
putchar('\n');
}
}
#endif
void
die(const char *errstr, ...) {
va_list ap;
va_start(ap, errstr);
vfprintf(stderr, errstr, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
void
execsh(void) {
char *args[3] = {getenv("SHELL"), "-i", NULL};
DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
putenv("TERM=" TNAME);
execvp(args[0], args);
}
void
xbell(void) { /* visual bell */
XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
/* usleep(30000); */
draw(SCREEN_REDRAW);
}
void
sigchld(int a) {
int stat = 0;
if(waitpid(pid, &stat, 0) < 0)
die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
if(WIFEXITED(stat))
exit(WEXITSTATUS(stat));
else
exit(EXIT_FAILURE);
}
void
ttynew(void) {
int m, s;
char *pts;
if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
die("openpt failed: %s\n", SERRNO);
if(grantpt(m) < 0)
die("grantpt failed: %s\n", SERRNO);
if(unlockpt(m) < 0)
die("unlockpt failed: %s\n", SERRNO);
if(!(pts = ptsname(m)))
die("ptsname failed: %s\n", SERRNO);
if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
die("Couldn't open slave: %s\n", SERRNO);
fcntl(s, F_SETFL, O_NDELAY);
switch(pid = fork()) {
case -1:
die("fork failed\n");
break;
case 0:
setsid(); /* create a new process group */
dup2(s, STDIN_FILENO);
dup2(s, STDOUT_FILENO);
dup2(s, STDERR_FILENO);
if(ioctl(s, TIOCSCTTY, NULL) < 0)
die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
close(s);
close(m);
execsh();
break;
default:
close(s);
cmdfd = m;
signal(SIGCHLD, sigchld);
}
}
void
dump(char c) {
static int col;
fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
if(++col % 10 == 0)
fprintf(stderr, "\n");
}
void
ttyread(void) {
char buf[BUFSIZ] = {0};
int ret;
if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
die("Couldn't read from shell: %s\n", SERRNO);
else
tputs(buf, ret);
}
void
ttywrite(const char *s, size_t n) {
if(write(cmdfd, s, n) == -1)
die("write error on tty: %s\n", SERRNO);
}
void
ttyresize(int x, int y) {
struct winsize w;
w.ws_row = term.row;
w.ws_col = term.col;
w.ws_xpixel = w.ws_ypixel = 0;
if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
}
void
tcursor(int mode) {
static TCursor c;
if(mode == CURSOR_SAVE)
c = term.c;
else if(mode == CURSOR_LOAD)
term.c = c, tmoveto(c.x, c.y);
}
void
treset(void) {
term.c.attr.mode = ATTR_NULL;
term.c.attr.fg = DefaultFG;
term.c.attr.bg = DefaultBG;
term.c.x = term.c.y = 0;
term.hidec = 0;
term.top = 0, term.bot = term.row - 1;
term.mode = MODE_WRAP;
tclearregion(0, 0, term.col-1, term.row-1);
}
void
tnew(int col, int row) {
/* screen size */
term.row = row, term.col = col;
term.top = 0, term.bot = term.row - 1;
/* mode */
term.mode = MODE_WRAP;
/* cursor */
term.c.attr.mode = ATTR_NULL;
term.c.attr.fg = DefaultFG;
term.c.attr.bg = DefaultBG;
term.c.x = term.c.y = 0;
term.hidec = 0;
/* allocate screen */
term.line = calloc(term.row, sizeof(Line));
for(row = 0 ; row < term.row; row++)
term.line[row] = calloc(term.col, sizeof(Glyph));
}
/* TODO: Replace with scrollup/scolldown */
void
tscroll(void) {
Line temp = term.line[term.top];
int i;
for(i = term.top; i < term.bot; i++)
term.line[i] = term.line[i+1];
memset(temp, 0, sizeof(Glyph) * term.col);
term.line[term.bot] = temp;
}
void
tscrolldown (int n) {
int i;
Line temp;
LIMIT(n, 0, term.bot-term.top+1);
for(i = 0; i < n; i++)
memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
for(i = term.bot; i >= term.top+n; i--) {
temp = term.line[i];
term.line[i] = term.line[i-n];
term.line[i-n] = temp;
}
}
void
tscrollup (int n) {
int i;
Line temp;
LIMIT(n, 0, term.bot-term.top+1);
for(i = 0; i < n; i++)
memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
for(i = term.top; i <= term.bot-n; i++) {
temp = term.line[i];
term.line[i] = term.line[i+n];
term.line[i+n] = temp;
}
}
void
tnewline(void) {
int y = term.c.y + 1;
if(y > term.bot)
tscroll(), y = term.bot;
tmoveto(0, y);
}
void
csiparse(void) {
/* int noarg = 1; */
char *p = escseq.buf;
escseq.narg = 0;
if(*p == '?')
escseq.priv = 1, p++;
while(p < escseq.buf+escseq.len) {
while(isdigit(*p)) {
escseq.arg[escseq.narg] *= 10;
escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
}
if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
escseq.narg++, p++;
else {
escseq.mode = *p;
escseq.narg++;
return;
}
}
}
void
tmoveto(int x, int y) {
term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
}
void
tsetchar(char c) {
term.line[term.c.y][term.c.x] = term.c.attr;
term.line[term.c.y][term.c.x].c = c;
term.line[term.c.y][term.c.x].state |= GLYPH_SET;
}
void
tclearregion(int x1, int y1, int x2, int y2) {
int y, temp;
if(x1 > x2)
temp = x1, x1 = x2, x2 = temp;
if(y1 > y2)
temp = y1, y1 = y2, y2 = temp;
LIMIT(x1, 0, term.col-1);
LIMIT(x2, 0, term.col-1);
LIMIT(y1, 0, term.row-1);
LIMIT(y2, 0, term.row-1);
for(y = y1; y <= y2; y++)
memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
}
void
tdeletechar(int n) {
int src = term.c.x + n;
int dst = term.c.x;
int size = term.col - src;
if(src >= term.col) {
tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
return;
}
memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
}
void
tinsertblank(int n) {
int src = term.c.x;
int dst = src + n;
int size = term.col - dst;
if(dst >= term.col) {
tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
return;
}
memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
tclearregion(src, term.c.y, dst - 1, term.c.y);
}
void
tinsertblankline(int n) {
int i;
Line blank;
int bot = term.bot;
if(term.c.y > term.bot)
bot = term.row - 1;
else if(term.c.y < term.top)
bot = term.top - 1;
if(term.c.y + n >= bot) {
tclearregion(0, term.c.y, term.col-1, bot);
return;
}
for(i = bot; i >= term.c.y+n; i--) {
/* swap deleted line <-> blanked line */
blank = term.line[i];
term.line[i] = term.line[i-n];
term.line[i-n] = blank;
/* blank it */
memset(blank, 0, term.col * sizeof(Glyph));
}
}
void
tdeleteline(int n) {
int i;
Line blank;
int bot = term.bot;
if(term.c.y > term.bot)
bot = term.row - 1;
else if(term.c.y < term.top)
bot = term.top - 1;
if(term.c.y + n >= bot) {
tclearregion(0, term.c.y, term.col-1, bot);
return;
}
for(i = term.c.y; i <= bot-n; i++) {
/* swap deleted line <-> blanked line */
blank = term.line[i];
term.line[i] = term.line[i+n];
term.line[i+n] = blank;
/* blank it */
memset(blank, 0, term.col * sizeof(Glyph));
}
}
void
tsetattr(int *attr, int l) {
int i;
for(i = 0; i < l; i++) {
switch(attr[i]) {
case 0:
term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
term.c.attr.fg = DefaultFG;
term.c.attr.bg = DefaultBG;
break;
case 1:
term.c.attr.mode |= ATTR_BOLD;
break;
case 4:
term.c.attr.mode |= ATTR_UNDERLINE;
break;
case 7:
term.c.attr.mode |= ATTR_REVERSE;
break;
case 22:
term.c.attr.mode &= ~ATTR_BOLD;
break;
case 24:
term.c.attr.mode &= ~ATTR_UNDERLINE;
break;
case 27:
term.c.attr.mode &= ~ATTR_REVERSE;
break;
case 38:
if (i + 2 < l && attr[i + 1] == 5) {
i += 2;
if (BETWEEN(attr[i], 0, 255))
term.c.attr.fg = attr[i];
else
fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
}
else
fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
break;
case 39:
term.c.attr.fg = DefaultFG;
break;
case 48:
if (i + 2 < l && attr[i + 1] == 5) {
i += 2;
if (BETWEEN(attr[i], 0, 255))
term.c.attr.bg = attr[i];
else
fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
}
else
fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
break;
case 49:
term.c.attr.bg = DefaultBG;
break;
default:
if(BETWEEN(attr[i], 30, 37))
term.c.attr.fg = attr[i] - 30;
else if(BETWEEN(attr[i], 40, 47))
term.c.attr.bg = attr[i] - 40;
else if(BETWEEN(attr[i], 90, 97))
term.c.attr.fg = attr[i] - 90 + 8;
else if(BETWEEN(attr[i], 100, 107))
term.c.attr.fg = attr[i] - 100 + 8;
else
fprintf(stderr, "erresc: gfx attr %d unknown\n", attr[i]);
break;
}
}
}
void
tsetscroll(int t, int b) {
int temp;
LIMIT(t, 0, term.row-1);
LIMIT(b, 0, term.row-1);
if(t > b) {
temp = t;
t = b;
b = temp;
}
term.top = t;
term.bot = b;
}
void
csihandle(void) {
switch(escseq.mode) {
default:
unknown:
printf("erresc: unknown csi ");
csidump();
/* die(""); */
break;
case '@': /* ICH -- Insert <n> blank char */
DEFAULT(escseq.arg[0], 1);
tinsertblank(escseq.arg[0]);
break;
case 'A': /* CUU -- Cursor <n> Up */
case 'e':
DEFAULT(escseq.arg[0], 1);
tmoveto(term.c.x, term.c.y-escseq.arg[0]);
break;
case 'B': /* CUD -- Cursor <n> Down */
DEFAULT(escseq.arg[0], 1);
tmoveto(term.c.x, term.c.y+escseq.arg[0]);
break;
case 'C': /* CUF -- Cursor <n> Forward */
case 'a':
DEFAULT(escseq.arg[0], 1);
tmoveto(term.c.x+escseq.arg[0], term.c.y);
break;
case 'D': /* CUB -- Cursor <n> Backward */
DEFAULT(escseq.arg[0], 1);
tmoveto(term.c.x-escseq.arg[0], term.c.y);
break;
case 'E': /* CNL -- Cursor <n> Down and first col */
DEFAULT(escseq.arg[0], 1);
tmoveto(0, term.c.y+escseq.arg[0]);
break;
case 'F': /* CPL -- Cursor <n> Up and first col */
DEFAULT(escseq.arg[0], 1);
tmoveto(0, term.c.y-escseq.arg[0]);
break;
case 'G': /* CHA -- Move to <col> */
case '`': /* XXX: HPA -- same? */
DEFAULT(escseq.arg[0], 1);
tmoveto(escseq.arg[0]-1, term.c.y);
break;
case 'H': /* CUP -- Move to <row> <col> */
case 'f': /* XXX: HVP -- same? */
DEFAULT(escseq.arg[0], 1);
DEFAULT(escseq.arg[1], 1);
tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
break;
/* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
case 'J': /* ED -- Clear screen */
switch(escseq.arg[0]) {
case 0: /* below */
tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
break;
case 1: /* above */
tclearregion(0, 0, term.c.x, term.c.y);
break;
case 2: /* all */
tclearregion(0, 0, term.col-1, term.row-1);
break;
case 3: /* XXX: erase saved lines (xterm) */
default:
goto unknown;
}
break;
case 'K': /* EL -- Clear line */
switch(escseq.arg[0]) {
case 0: /* right */
tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
break;
case 1: /* left */
tclearregion(0, term.c.y, term.c.x, term.c.y);
break;
case 2: /* all */
tclearregion(0, term.c.y, term.col-1, term.c.y);
break;
}
break;
case 'S': /* SU -- Scroll <n> line up */
DEFAULT(escseq.arg[0], 1);
tscrollup(escseq.arg[0]);
break;
case 'T': /* SD -- Scroll <n> line down */
DEFAULT(escseq.arg[0], 1);
tscrolldown(escseq.arg[0]);
break;
case 'L': /* IL -- Insert <n> blank lines */
DEFAULT(escseq.arg[0], 1);
tinsertblankline(escseq.arg[0]);
break;
case 'l': /* RM -- Reset Mode */
if(escseq.priv) {
switch(escseq.arg[0]) {
case 1:
term.mode &= ~MODE_APPKEYPAD;
break;
case 7:
term.mode &= ~MODE_WRAP;
break;
case 12: /* att610 -- Stop blinking cursor (IGNORED) */
break;
case 25:
term.hidec = 1;
break;
case 1048: /* XXX: no alt. screen to erase/save */
case 1049:
tcursor(CURSOR_LOAD);
tclearregion(0, 0, term.col-1, term.row-1);
break;
default:
goto unknown;
}
} else {
switch(escseq.arg[0]) {
case 4:
term.mode &= ~MODE_INSERT;
break;
default:
goto unknown;
}
}
break;
case 'M': /* DL -- Delete <n> lines */
DEFAULT(escseq.arg[0], 1);
tdeleteline(escseq.arg[0]);
break;
case 'X': /* ECH -- Erase <n> char */
DEFAULT(escseq.arg[0], 1);
tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
break;
case 'P': /* DCH -- Delete <n> char */
DEFAULT(escseq.arg[0], 1);
tdeletechar(escseq.arg[0]);
break;
/* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
case 'd': /* VPA -- Move to <row> */
DEFAULT(escseq.arg[0], 1);
tmoveto(term.c.x, escseq.arg[0]-1);
break;
case 'h': /* SM -- Set terminal mode */
if(escseq.priv) {
switch(escseq.arg[0]) {
case 1:
term.mode |= MODE_APPKEYPAD;
break;
case 7:
term.mode |= MODE_WRAP;
break;
case 12: /* att610 -- Start blinking cursor (IGNORED) */
break;
case 25:
term.hidec = 0;
break;
case 1048:
case 1049: /* XXX: no alt. screen to erase/save */
tcursor(CURSOR_SAVE);
tclearregion(0, 0, term.col-1, term.row-1);
break;
default: goto unknown;
}
} else {
switch(escseq.arg[0]) {
case 4:
term.mode |= MODE_INSERT;
break;
default: goto unknown;
}
};
break;
case 'm': /* SGR -- Terminal attribute (color) */
tsetattr(escseq.arg, escseq.narg);
break;
case 'r': /* DECSTBM -- Set Scrolling Region */
if(escseq.priv)
goto unknown;
else {
DEFAULT(escseq.arg[0], 1);
DEFAULT(escseq.arg[1], term.row);
tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
}
break;
case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
tcursor(CURSOR_SAVE);
break;
case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
tcursor(CURSOR_LOAD);
break;
}
}
void
csidump(void) {
int i;
printf("ESC [ %s", escseq.priv ? "? " : "");
if(escseq.narg)
for(i = 0; i < escseq.narg; i++)
printf("%d ", escseq.arg[i]);
if(escseq.mode)
putchar(escseq.mode);
putchar('\n');
}
void
csireset(void) {
memset(&escseq, 0, sizeof(escseq));
}
void
tputtab(void) {
int space = TAB - term.c.x % TAB;
tmoveto(term.c.x + space, term.c.y);
}
void
tputc(char c) {
if(term.esc & ESC_START) {
if(term.esc & ESC_CSI) {
escseq.buf[escseq.len++] = c;
if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
term.esc = 0;
csiparse(), csihandle();
}
} else if(term.esc & ESC_OSC) {
if(c == ';') {
term.titlelen = 0;
term.esc = ESC_START | ESC_TITLE;
}
} else if(term.esc & ESC_TITLE) {
if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
term.esc = 0;
term.title[term.titlelen] = '\0';
XStoreName(xw.dis, xw.win, term.title);
} else {
term.title[term.titlelen++] = c;
}
} else if(term.esc & ESC_ALTCHARSET) {
switch(c) {
case '0': /* Line drawing crap */
term.c.attr.mode |= ATTR_GFX;
break;
case 'B': /* Back to regular text */
term.c.attr.mode &= ~ATTR_GFX;
break;
default:
printf("esc unhandled charset: ESC ( %c\n", c);
}
term.esc = 0;
} else {
switch(c) {
case '[':
term.esc |= ESC_CSI;
break;
case ']':
term.esc |= ESC_OSC;
break;
case '(':
term.esc |= ESC_ALTCHARSET;
break;
case 'A':
tmoveto(term.c.x, term.c.y-1);
term.esc = 0;
break;
case 'B':
tmoveto(term.c.x, term.c.y+1);
term.esc = 0;
break;
case 'C':
tmoveto(term.c.x+1, term.c.y);
term.esc = 0;
break;
case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
tmoveto(term.c.x-1, term.c.y);
term.esc = 0;
break;
case 'E': /* NEL -- Next line */
tnewline();
term.esc = 0;
break;
case 'M': /* RI -- Reverse index */
if(term.c.y == term.top)
tscrolldown(1);
else
tmoveto(term.c.x, term.c.y-1);
term.esc = 0;
break;
case 'c': /* RIS -- Reset to inital state */
treset();
term.esc = 0;
break;
case '=': /* DECPAM */
term.mode |= MODE_APPKEYPAD;
term.esc = 0;
break;
case '>': /* DECPNM */
term.mode &= ~MODE_APPKEYPAD;
term.esc = 0;
break;
case '7':
tcursor(CURSOR_SAVE);
term.esc = 0;
break;
case '8':
tcursor(CURSOR_LOAD);
term.esc = 0;
break;
default:
fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
term.esc = 0;
}
}
} else {
switch(c) {
case '\t':
tputtab();
break;
case '\b':
tmoveto(term.c.x-1, term.c.y);
break;
case '\r':
tmoveto(0, term.c.y);
break;
case '\n':
tnewline();
break;
case '\a':
xbell();
break;
case '\033':
csireset();
term.esc = ESC_START;
break;
default:
tsetchar(c);
if(term.c.x+1 < term.col) {
tmoveto(term.c.x+1, term.c.y);
} else if(IS_SET(MODE_WRAP))
tnewline();
break;
}
}
}
void
tputs(char *s, int len) {
for(; len > 0; len--)
tputc(*s++);
}
void
tresize(int col, int row) {
int i;
int minrow = MIN(row, term.row);
int mincol = MIN(col, term.col);
if(col < 1 || row < 1)
return;
/* free uneeded rows */
for(i = row; i < term.row; i++)
free(term.line[i]);
/* resize to new height */
term.line = realloc(term.line, row * sizeof(Line));
/* resize each row to new width, zero-pad if needed */
for(i = 0; i < minrow; i++) {
term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
}
/* allocate any new rows */
for(/* i == minrow */; i < row; i++)
term.line[i] = calloc(col, sizeof(Glyph));
LIMIT(term.c.x, 0, col-1);
LIMIT(term.c.y, 0, row-1);
LIMIT(term.top, 0, row-1);
LIMIT(term.bot, 0, row-1);
term.bot = row-1;
term.col = col, term.row = row;
}
void
xloadcols(void) {
int i, r, g, b;
XColor color;
Colormap cmap = DefaultColormap(xw.dis, xw.scr);
unsigned long white = WhitePixel(xw.dis, xw.scr);
for(i = 0; i < 16; i++) {
if (!XAllocNamedColor(xw.dis, cmap, colorname[i], &color, &color)) {
dc.col[i] = white;
fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
} else
dc.col[i] = color.pixel;
}
/* same colors as xterm */
for(r = 0; r < 6; r++)
for(g = 0; g < 6; g++)
for(b = 0; b < 6; b++) {
color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
if (!XAllocColor(xw.dis, cmap, &color)) {
dc.col[i] = white;
fprintf(stderr, "Could not allocate color %d\n", i);
} else
dc.col[i] = color.pixel;
i++;
}
for(r = 0; r < 24; r++, i++) {
color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
if (!XAllocColor(xw.dis, cmap, &color)) {
dc.col[i] = white;
fprintf(stderr, "Could not allocate color %d\n", i);
} else
dc.col[i] = color.pixel;
}
}
void
xclear(int x1, int y1, int x2, int y2) {
XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
XFillRectangle(xw.dis, xw.buf, dc.gc,
x1 * xw.cw, y1 * xw.ch,
(x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
}
void
xhints(void)
{
XClassHint class = {TNAME, TNAME};
XWMHints wm = {.flags = InputHint, .input = 1};
XSizeHints size = {
.flags = PSize | PResizeInc | PBaseSize,
.height = xw.h,
.width = xw.w,
.height_inc = xw.ch,
.width_inc = xw.cw,
.base_height = 2*BORDER,
.base_width = 2*BORDER,
};
XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
}
void
xinit(void) {
xw.dis = XOpenDisplay(NULL);
xw.scr = XDefaultScreen(xw.dis);
if(!xw.dis)
die("Can't open display\n");
/* font */
if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
/* XXX: Assuming same size for bold font */
xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
xw.ch = dc.font->ascent + dc.font->descent;
/* colors */
xloadcols();
term.c.attr.fg = DefaultFG;
term.c.attr.bg = DefaultBG;
term.c.attr.mode = ATTR_NULL;
/* windows */
xw.h = term.row * xw.ch + 2*BORDER;
xw.w = term.col * xw.cw + 2*BORDER;
xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
xw.w, xw.h, 0,
dc.col[DefaultBG],
dc.col[DefaultBG]);
xw.bufw = xw.w - 2*BORDER;
xw.bufh = xw.h - 2*BORDER;
xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
/* gc */
dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
XMapWindow(xw.dis, xw.win);
xhints();
XStoreName(xw.dis, xw.win, "st");
XSync(xw.dis, 0);
}
void
xdraws(char *s, Glyph base, int x, int y, int len) {
unsigned long xfg, xbg;
int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
int i;
if(base.mode & ATTR_REVERSE)
xfg = dc.col[base.bg], xbg = dc.col[base.fg];
else
xfg = dc.col[base.fg], xbg = dc.col[base.bg];
XSetBackground(xw.dis, dc.gc, xbg);
XSetForeground(xw.dis, dc.gc, xfg);
if(base.mode & ATTR_GFX)
for(i = 0; i < len; i++)
s[i] = gfx[(int)s[i]];
XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
if(base.mode & ATTR_UNDERLINE)
XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
}
void
xcursor(int mode) {
static int oldx = 0;
static int oldy = 0;
Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
LIMIT(oldx, 0, term.col-1);
LIMIT(oldy, 0, term.row-1);
if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
g.c = term.line[term.c.y][term.c.x].c;
/* remove the old cursor */
if(term.line[oldy][oldx].state & GLYPH_SET)
xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
else
xclear(oldx, oldy, oldx, oldy);
/* draw the new one */
if(mode == CURSOR_DRAW) {
xdraws(&g.c, g, term.c.x, term.c.y, 1);
oldx = term.c.x, oldy = term.c.y;
}
}
#ifdef DEBUG
/* basic drawing routines */
void
xdrawc(int x, int y, Glyph g) {
XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
}
void
draw(int dummy) {
int x, y;
xclear(0, 0, term.col-1, term.row-1);
for(y = 0; y < term.row; y++)
for(x = 0; x < term.col; x++)
if(term.line[y][x].state & GLYPH_SET)
xdrawc(x, y, term.line[y][x]);
if(!term.hidec)
xcursor(CURSOR_DRAW);
XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
XFlush(xw.dis);
}
#else
/* optimized drawing routine */
void
draw(int redraw_all) {
int i, x, y, ox;
Glyph base, new;
char buf[DRAW_BUF_SIZ];
XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
XFillRectangle(xw.dis, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
for(y = 0; y < term.row; y++) {
base = term.line[y][0];
i = ox = 0;
for(x = 0; x < term.col; x++) {
new = term.line[y][x];
if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
buf[i++] = new.c;
else {
xdraws(buf, base, ox, y, i);
buf[0] = new.c;
i = 1;
ox = x;
base = new;
}
}
xdraws(buf, base, ox, y, i);
}
xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
XFlush(xw.dis);
}
#endif
void
expose(XEvent *ev) {
draw(SCREEN_REDRAW);
}
char*
kmap(KeySym k) {
int i;
for(i = 0; i < LEN(key); i++)
if(key[i].k == k)
return (char*)key[i].s;
return NULL;
}
void
kpress(XEvent *ev) {
XKeyEvent *e = &ev->xkey;
KeySym ksym;
char buf[32];
char *customkey;
int len;
int meta;
int shift;
meta = e->state & Mod1Mask;
shift = e->state & ShiftMask;
len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
if((customkey = kmap(ksym)))
ttywrite(customkey, strlen(customkey));
else if(len > 0) {
buf[sizeof(buf)-1] = '\0';
if(meta && len == 1)
ttywrite("\033", 1);
ttywrite(buf, len);
} else
switch(ksym) {
case XK_Up:
case XK_Down:
case XK_Left:
case XK_Right:
sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', "DACB"[ksym - XK_Left]);
ttywrite(buf, 3);
break;
case XK_Insert:
if(shift)
draw(1), puts("draw!")/* XXX: paste X clipboard */;
break;
default:
fprintf(stderr, "errkey: %d\n", (int)ksym);
break;
}
}
void
resize(XEvent *e) {
int col, row;
if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
return;
xw.w = e->xconfigure.width;
xw.h = e->xconfigure.height;
xw.bufw = xw.w - 2*BORDER;
xw.bufh = xw.h - 2*BORDER;
col = xw.bufw / xw.cw;
row = xw.bufh / xw.ch;
tresize(col, row);
ttyresize(col, row);
XFreePixmap(xw.dis, xw.buf);
xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
draw(SCREEN_REDRAW);
}
void
run(void) {
XEvent ev;
fd_set rfd;
int xfd = XConnectionNumber(xw.dis);
running = 1;
XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
while(running) {
FD_ZERO(&rfd);
FD_SET(cmdfd, &rfd);
FD_SET(xfd, &rfd);
if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
if(errno == EINTR)
continue;
die("select failed: %s\n", SERRNO);
}
if(FD_ISSET(cmdfd, &rfd)) {
ttyread();
draw(SCREEN_UPDATE);
}
while(XPending(xw.dis)) {
XNextEvent(xw.dis, &ev);
if(handler[ev.type])
(handler[ev.type])(&ev);
}
}
}
int
main(int argc, char *argv[]) {
if(argc == 2 && !strncmp("-v", argv[1], 3))
die("st-" VERSION ", (c) 2010 st engineers\n");
else if(argc != 1)
die("usage: st [-v]\n");
setlocale(LC_CTYPE, "");
tnew(80, 24);
ttynew();
xinit();
run();
return 0;
}
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