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st/st.c

2568 lines
57 KiB

/* 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 <stdbool.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/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/cursorfont.h>
#include <X11/keysym.h>
#include <X11/extensions/Xdbe.h>
#include <X11/Xft/Xft.h>
#define Glyph Glyph_
#define Font Font_
#if defined(__linux)
#include <pty.h>
#elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
#include <util.h>
#elif defined(__FreeBSD__) || defined(__DragonFly__)
#include <libutil.h>
#endif
#define USAGE \
"st " VERSION " (c) 2010-2012 st engineers\n" \
"usage: st [-v] [-c class] [-f font] [-g geometry] [-o file]" \
" [-t title] [-w windowid] [-e command ...]\n"
/* XEMBED messages */
#define XEMBED_FOCUS_IN 4
#define XEMBED_FOCUS_OUT 5
/* Arbitrary sizes */
#define ESC_BUF_SIZ 256
#define ESC_ARG_SIZ 16
#define STR_BUF_SIZ 256
#define STR_ARG_SIZ 16
#define DRAW_BUF_SIZ 20*1024
#define UTF_SIZ 4
#define XK_NO_MOD UINT_MAX
#define XK_ANY_MOD 0
#define REDRAW_TIMEOUT (80*1000) /* 80 ms */
#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))
#define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
#define X2COL(x) (((x) - BORDER)/xw.cw)
#define Y2ROW(y) (((y) - BORDER)/xw.ch)
enum glyph_attribute {
ATTR_NULL = 0,
ATTR_REVERSE = 1,
ATTR_UNDERLINE = 2,
ATTR_BOLD = 4,
ATTR_GFX = 8,
ATTR_ITALIC = 16,
ATTR_BLINK = 32,
};
enum cursor_movement {
CURSOR_UP,
CURSOR_DOWN,
CURSOR_LEFT,
CURSOR_RIGHT,
CURSOR_SAVE,
CURSOR_LOAD
};
enum cursor_state {
CURSOR_DEFAULT = 0,
CURSOR_HIDE = 1,
CURSOR_WRAPNEXT = 2
};
enum glyph_state {
GLYPH_SET = 1,
GLYPH_DIRTY = 2
};
enum term_mode {
MODE_WRAP = 1,
MODE_INSERT = 2,
MODE_APPKEYPAD = 4,
MODE_ALTSCREEN = 8,
MODE_CRLF = 16,
MODE_MOUSEBTN = 32,
MODE_MOUSEMOTION = 64,
MODE_MOUSE = 32|64,
MODE_REVERSE = 128,
MODE_KBDLOCK = 256
};
enum escape_state {
ESC_START = 1,
ESC_CSI = 2,
ESC_STR = 4, /* DSC, OSC, PM, APC */
ESC_ALTCHARSET = 8,
ESC_STR_END = 16, /* a final string was encountered */
};
enum window_state {
WIN_VISIBLE = 1,
WIN_REDRAW = 2,
WIN_FOCUSED = 4
};
/* bit macro */
#undef B0
enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
typedef unsigned char uchar;
typedef unsigned int uint;
typedef unsigned long ulong;
typedef unsigned short ushort;
typedef struct {
char c[UTF_SIZ]; /* character code */
uchar mode; /* attribute flags */
ushort fg; /* foreground */
ushort bg; /* background */
uchar state; /* state flags */
} Glyph;
typedef Glyph* Line;
typedef struct {
Glyph attr; /* current char attributes */
int x;
int y;
char state;
} 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;
/* STR Escape sequence structs */
/* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
typedef struct {
char type; /* ESC type ... */
char buf[STR_BUF_SIZ]; /* raw string */
int len; /* raw string length */
char *args[STR_ARG_SIZ];
int narg; /* nb of args */
} STREscape;
/* Internal representation of the screen */
typedef struct {
int row; /* nb row */
int col; /* nb col */
Line* line; /* screen */
Line* alt; /* alternate screen */
bool* dirty; /* dirtyness of lines */
TCursor c; /* cursor */
int top; /* top scroll limit */
int bot; /* bottom scroll limit */
int mode; /* terminal mode flags */
int esc; /* escape state flags */
bool *tabs;
} Term;
/* Purely graphic info */
typedef struct {
Display* dpy;
Colormap cmap;
Window win;
XdbeBackBuffer buf;
Atom xembed;
XIM xim;
XIC xic;
XftDraw *xft_draw;
Visual *vis;
int scr;
bool isfixed; /* is fixed geometry? */
int fx, fy, fw, fh; /* fixed geometry */
int tw, th; /* tty width and height */
int w; /* window width */
int h; /* window height */
int ch; /* char height */
int cw; /* char width */
char state; /* focus, redraw, visible */
} XWindow;
typedef struct {
KeySym k;
uint mask;
char s[ESC_BUF_SIZ];
} Key;
/* TODO: use better name for vars... */
typedef struct {
int mode;
int bx, by;
int ex, ey;
struct {int x, y;} b, e;
char *clip;
Atom xtarget;
bool alt;
struct timeval tclick1;
struct timeval tclick2;
} Selection;
#include "config.h"
/* Font structure */
typedef struct {
int ascent;
int descent;
short lbearing;
short rbearing;
XftFont* xft_set;
} Font;
/* Drawing Context */
typedef struct {
XftColor xft_col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
GC gc;
Font font, bfont, ifont, ibfont;
} DC;
static void die(const char*, ...);
static void draw(void);
static void redraw(void);
static void drawregion(int, int, int, 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 strdump(void);
static void strhandle(void);
static void strparse(void);
static void strreset(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(int);
static void tputtab(bool);
static void tputc(char*, int);
static void treset(void);
static int tresize(int, int);
static void tscrollup(int, int);
static void tscrolldown(int, int);
static void tsetattr(int*, int);
static void tsetchar(char*);
static void tsetscroll(int, int);
static void tswapscreen(void);
static void tsetdirt(int, int);
static void tsetmode(bool, bool, int *, int);
static void tfulldirt(void);
static void ttynew(void);
static void ttyread(void);
static void ttyresize(void);
static void ttywrite(const char *, size_t);
static void xdraws(char *, Glyph, int, int, int, int);
static void xhints(void);
static void xclear(int, int, int, int);
static void xclearborders(void);
static void xdrawcursor(void);
static void xinit(void);
static void xloadcols(void);
static void xresettitle(void);
static void xseturgency(int);
static void xsetsel(char*);
static void xtermclear(int, int, int, int);
static void xresize(int, int);
static void expose(XEvent *);
static void visibility(XEvent *);
static void unmap(XEvent *);
static char* kmap(KeySym, uint);
static void kpress(XEvent *);
static void cmessage(XEvent *);
static void resize(XEvent *);
static void focus(XEvent *);
static void brelease(XEvent *);
static void bpress(XEvent *);
static void bmotion(XEvent *);
static void selnotify(XEvent *);
static void selclear(XEvent *);
static void selrequest(XEvent *);
static void selinit(void);
static inline bool selected(int, int);
static void selcopy(void);
static void selpaste(void);
static void selscroll(int, int);
static int utf8decode(char *, long *);
static int utf8encode(long *, char *);
static int utf8size(char *);
static int isfullutf8(char *, int);
static void *xmalloc(size_t);
static void *xrealloc(void *, size_t);
static void *xcalloc(size_t nmemb, size_t size);
static char *smstrcat(char *, ...);
static void (*handler[LASTEvent])(XEvent *) = {
[KeyPress] = kpress,
[ClientMessage] = cmessage,
[ConfigureNotify] = resize,
[VisibilityNotify] = visibility,
[UnmapNotify] = unmap,
[Expose] = expose,
[FocusIn] = focus,
[FocusOut] = focus,
[MotionNotify] = bmotion,
[ButtonPress] = bpress,
[ButtonRelease] = brelease,
[SelectionClear] = selclear,
[SelectionNotify] = selnotify,
[SelectionRequest] = selrequest,
};
/* Globals */
static DC dc;
static XWindow xw;
static Term term;
static CSIEscape csiescseq;
static STREscape strescseq;
static int cmdfd;
static pid_t pid;
static Selection sel;
static int iofd = -1;
static char **opt_cmd = NULL;
static char *opt_io = NULL;
static char *opt_title = NULL;
static char *opt_embed = NULL;
static char *opt_class = NULL;
static char *opt_font = NULL;
void *
xmalloc(size_t len) {
void *p = malloc(len);
if(!p)
die("Out of memory\n");
return p;
}
void *
xrealloc(void *p, size_t len) {
if((p = realloc(p, len)) == NULL)
die("Out of memory\n");
return p;
}
void *
xcalloc(size_t nmemb, size_t size) {
void *p = calloc(nmemb, size);
if(!p)
die("Out of memory\n");
return p;
}
char *
smstrcat(char *src, ...)
{
va_list fmtargs;
char *ret, *p, *v;
int len, slen, flen;
len = slen = strlen(src);
va_start(fmtargs, src);
for(;;) {
v = va_arg(fmtargs, char *);
if(v == NULL)
break;
len += strlen(v);
}
va_end(fmtargs);
p = ret = xmalloc(len+1);
memmove(p, src, slen);
p += slen;
va_start(fmtargs, src);
for(;;) {
v = va_arg(fmtargs, char *);
if(v == NULL)
break;
flen = strlen(v);
memmove(p, v, flen);
p += flen;
}
va_end(fmtargs);
ret[len] = '\0';
return ret;
}
int
utf8decode(char *s, long *u) {
uchar c;
int i, n, rtn;
rtn = 1;
c = *s;
if(~c & B7) { /* 0xxxxxxx */
*u = c;
return rtn;
} else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
*u = c&(B4|B3|B2|B1|B0);
n = 1;
} else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
*u = c&(B3|B2|B1|B0);
n = 2;
} else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
*u = c & (B2|B1|B0);
n = 3;
} else
goto invalid;
for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
c = *s;
if((c & (B7|B6)) != B7) /* 10xxxxxx */
goto invalid;
*u <<= 6;
*u |= c & (B5|B4|B3|B2|B1|B0);
}
if((n == 1 && *u < 0x80) ||
(n == 2 && *u < 0x800) ||
(n == 3 && *u < 0x10000) ||
(*u >= 0xD800 && *u <= 0xDFFF))
goto invalid;
return rtn;
invalid:
*u = 0xFFFD;
return rtn;
}
int
utf8encode(long *u, char *s) {
uchar *sp;
ulong uc;
int i, n;
sp = (uchar*) s;
uc = *u;
if(uc < 0x80) {
*sp = uc; /* 0xxxxxxx */
return 1;
} else if(*u < 0x800) {
*sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
n = 1;
} else if(uc < 0x10000) {
*sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
n = 2;
} else if(uc <= 0x10FFFF) {
*sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
n = 3;
} else {
goto invalid;
}
for(i=n,++sp; i>0; --i,++sp)
*sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
return n+1;
invalid:
/* U+FFFD */
*s++ = '\xEF';
*s++ = '\xBF';
*s = '\xBD';
return 3;
}
/* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
UTF-8 otherwise return 0 */
int
isfullutf8(char *s, int b) {
uchar *c1, *c2, *c3;
c1 = (uchar *) s;
c2 = (uchar *) ++s;
c3 = (uchar *) ++s;
if(b < 1)
return 0;
else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
return 0;
else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
((b == 1) ||
((b == 2) && (*c2&(B7|B6)) == B7)))
return 0;
else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
((b == 1) ||
((b == 2) && (*c2&(B7|B6)) == B7) ||
((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
return 0;
else
return 1;
}
int
utf8size(char *s) {
uchar c = *s;
if(~c&B7)
return 1;
else if((c&(B7|B6|B5)) == (B7|B6))
return 2;
else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
return 3;
else
return 4;
}
void
selinit(void) {
memset(&sel.tclick1, 0, sizeof(sel.tclick1));
memset(&sel.tclick2, 0, sizeof(sel.tclick2));
sel.mode = 0;
sel.bx = -1;
sel.clip = NULL;
sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
if(sel.xtarget == None)
sel.xtarget = XA_STRING;
}
static inline bool
selected(int x, int y) {
if(sel.ey == y && sel.by == y) {
int bx = MIN(sel.bx, sel.ex);
int ex = MAX(sel.bx, sel.ex);
return BETWEEN(x, bx, ex);
}
return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
|| (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
}
void
getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
if(b)
*b = e->xbutton.button;
*x = X2COL(e->xbutton.x);
*y = Y2ROW(e->xbutton.y);
sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
sel.b.y = MIN(sel.by, sel.ey);
sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
sel.e.y = MAX(sel.by, sel.ey);
}
void
mousereport(XEvent *e) {
int x = X2COL(e->xbutton.x);
int y = Y2ROW(e->xbutton.y);
int button = e->xbutton.button;
int state = e->xbutton.state;
char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
static int ob, ox, oy;
/* from urxvt */
if(e->xbutton.type == MotionNotify) {
if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
return;
button = ob + 32;
ox = x, oy = y;
} else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
button = 3;
} else {
button -= Button1;
if(button >= 3)
button += 64 - 3;
if(e->xbutton.type == ButtonPress) {
ob = button;
ox = x, oy = y;
}
}
buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
+ (state & Mod4Mask ? 8 : 0)
+ (state & ControlMask ? 16 : 0);
ttywrite(buf, sizeof(buf));
}
void
bpress(XEvent *e) {
if(IS_SET(MODE_MOUSE))
mousereport(e);
else if(e->xbutton.button == Button1) {
if(sel.bx != -1) {
sel.bx = -1;
tsetdirt(sel.b.y, sel.e.y);
draw();
}
sel.mode = 1;
sel.ex = sel.bx = X2COL(e->xbutton.x);
sel.ey = sel.by = Y2ROW(e->xbutton.y);
}
}
void
selcopy(void) {
char *str, *ptr;
int x, y, bufsize, is_selected = 0;
if(sel.bx == -1)
str = NULL;
else {
bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
ptr = str = xmalloc(bufsize);
/* append every set & selected glyph to the selection */
for(y = 0; y < term.row; y++) {
for(x = 0; x < term.col; x++) {
int size;
char *p;
Glyph *gp = &term.line[y][x];
if(!(is_selected = selected(x, y)))
continue;
p = (gp->state & GLYPH_SET) ? gp->c : " ";
size = utf8size(p);
memcpy(ptr, p, size);
ptr += size;
}
/* \n at the end of every selected line except for the last one */
if(is_selected && y < sel.e.y)
*ptr++ = '\n';
}
*ptr = 0;
}
sel.alt = IS_SET(MODE_ALTSCREEN);
xsetsel(str);
}
void
selnotify(XEvent *e) {
ulong nitems, ofs, rem;
int format;
uchar *data;
Atom type;
ofs = 0;
do {
if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
False, AnyPropertyType, &type, &format,
&nitems, &rem, &data)) {
fprintf(stderr, "Clipboard allocation failed\n");
return;
}
ttywrite((const char *) data, nitems * format / 8);
XFree(data);
/* number of 32-bit chunks returned */
ofs += nitems * format / 32;
} while(rem > 0);
}
void
selpaste() {
XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
}
void selclear(XEvent *e) {
if(sel.bx == -1)
return;
sel.bx = -1;
tsetdirt(sel.b.y, sel.e.y);
}
void
selrequest(XEvent *e) {
XSelectionRequestEvent *xsre;
XSelectionEvent xev;
Atom xa_targets;
xsre = (XSelectionRequestEvent *) e;
xev.type = SelectionNotify;
xev.requestor = xsre->requestor;
xev.selection = xsre->selection;
xev.target = xsre->target;
xev.time = xsre->time;
/* reject */
xev.property = None;
xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
if(xsre->target == xa_targets) {
/* respond with the supported type */
Atom string = sel.xtarget;
XChangeProperty(xsre->display, xsre->requestor, xsre->property,
XA_ATOM, 32, PropModeReplace,
(uchar *) &string, 1);
xev.property = xsre->property;
} else if(xsre->target == sel.xtarget && sel.clip != NULL) {
XChangeProperty(xsre->display, xsre->requestor, xsre->property,
xsre->target, 8, PropModeReplace,
(uchar *) sel.clip, strlen(sel.clip));
xev.property = xsre->property;
}
/* all done, send a notification to the listener */
if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
fprintf(stderr, "Error sending SelectionNotify event\n");
}
void
xsetsel(char *str) {
/* register the selection for both the clipboard and the primary */
Atom clipboard;
free(sel.clip);
sel.clip = str;
XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
}
void
brelease(XEvent *e) {
if(IS_SET(MODE_MOUSE)) {
mousereport(e);
return;
}
if(e->xbutton.button == Button2)
selpaste();
else if(e->xbutton.button == Button1) {
sel.mode = 0;
getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
term.dirty[sel.ey] = 1;
if(sel.bx == sel.ex && sel.by == sel.ey) {
struct timeval now;
sel.bx = -1;
gettimeofday(&now, NULL);
if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
/* triple click on the line */
sel.b.x = sel.bx = 0;
sel.e.x = sel.ex = term.col;
sel.b.y = sel.e.y = sel.ey;
selcopy();
} else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
/* double click to select word */
sel.bx = sel.ex;
while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
sel.b.x = sel.bx;
while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
sel.e.x = sel.ex;
sel.b.y = sel.e.y = sel.ey;
selcopy();
}
} else
selcopy();
}
memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
gettimeofday(&sel.tclick1, NULL);
}
void
bmotion(XEvent *e) {
if(IS_SET(MODE_MOUSE)) {
mousereport(e);
return;
}
if(sel.mode) {
int oldey = sel.ey, oldex = sel.ex;
getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
if(oldey != sel.ey || oldex != sel.ex) {
int starty = MIN(oldey, sel.ey);
int endy = MAX(oldey, sel.ey);
tsetdirt(starty, endy);
}
}
}
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;
char *envshell = getenv("SHELL");
unsetenv("COLUMNS");
unsetenv("LINES");
unsetenv("TERMCAP");
signal(SIGCHLD, SIG_DFL);
signal(SIGHUP, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGALRM, SIG_DFL);
DEFAULT(envshell, SHELL);
putenv("TERM="TNAME);
args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
execvp(args[0], args);
exit(EXIT_FAILURE);
}
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;
/* seems to work fine on linux, openbsd and freebsd */
struct winsize w = {term.row, term.col, 0, 0};
if(openpty(&m, &s, NULL, NULL, &w) < 0)
die("openpty failed: %s\n", SERRNO);
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);
if(opt_io) {
if(!strcmp(opt_io, "-")) {
iofd = STDOUT_FILENO;
} else {
if((iofd = open(opt_io, O_WRONLY | O_CREAT, 0666)) < 0) {
fprintf(stderr, "Error opening %s:%s\n",
opt_io, strerror(errno));
}
}
}
}
}
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) {
static char buf[BUFSIZ];
static int buflen = 0;
char *ptr;
char s[UTF_SIZ];
int charsize; /* size of utf8 char in bytes */
long utf8c;
int ret;
/* append read bytes to unprocessed bytes */
if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
die("Couldn't read from shell: %s\n", SERRNO);
/* process every complete utf8 char */
buflen += ret;
ptr = buf;
while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
charsize = utf8decode(ptr, &utf8c);
utf8encode(&utf8c, s);
tputc(s, charsize);
ptr += charsize;
buflen -= charsize;
}
/* keep any uncomplete utf8 char for the next call */
memmove(buf, ptr, buflen);
}
void
ttywrite(const char *s, size_t n) {
if(write(cmdfd, s, n) == -1)
die("write error on tty: %s\n", SERRNO);
}
void
ttyresize(void) {
struct winsize w;
w.ws_row = term.row;
w.ws_col = term.col;
w.ws_xpixel = xw.tw;
w.ws_ypixel = xw.th;
if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
}
void
tsetdirt(int top, int bot)
{
int i;
LIMIT(top, 0, term.row-1);
LIMIT(bot, 0, term.row-1);
for(i = top; i <= bot; i++)
term.dirty[i] = 1;
}
void
tfulldirt(void)
{
tsetdirt(0, term.row-1);
}
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) {
uint i;
term.c = (TCursor){{
.mode = ATTR_NULL,
.fg = DefaultFG,
.bg = DefaultBG
}, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
memset(term.tabs, 0, term.col * sizeof(*term.tabs));
for(i = TAB; i < term.col; i += TAB)
term.tabs[i] = 1;
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) {
/* set screen size */
term.row = row, term.col = col;
term.line = xmalloc(term.row * sizeof(Line));
term.alt = xmalloc(term.row * sizeof(Line));
term.dirty = xmalloc(term.row * sizeof(*term.dirty));
term.tabs = xmalloc(term.col * sizeof(*term.tabs));
for(row = 0; row < term.row; row++) {
term.line[row] = xmalloc(term.col * sizeof(Glyph));
term.alt [row] = xmalloc(term.col * sizeof(Glyph));
term.dirty[row] = 0;
}
memset(term.tabs, 0, term.col * sizeof(*term.tabs));
/* setup screen */
treset();
}
void
tswapscreen(void) {
Line* tmp = term.line;
term.line = term.alt;
term.alt = tmp;
term.mode ^= MODE_ALTSCREEN;
tfulldirt();
}
void
tscrolldown(int orig, int n) {
int i;
Line temp;
LIMIT(n, 0, term.bot-orig+1);
tclearregion(0, term.bot-n+1, term.col-1, term.bot);
for(i = term.bot; i >= orig+n; i--) {
temp = term.line[i];
term.line[i] = term.line[i-n];
term.line[i-n] = temp;
term.dirty[i] = 1;
term.dirty[i-n] = 1;
}
selscroll(orig, n);
}
void
tscrollup(int orig, int n) {
int i;
Line temp;
LIMIT(n, 0, term.bot-orig+1);
tclearregion(0, orig, term.col-1, orig+n-1);
for(i = orig; i <= term.bot-n; i++) {
temp = term.line[i];
term.line[i] = term.line[i+n];
term.line[i+n] = temp;
term.dirty[i] = 1;
term.dirty[i+n] = 1;
}
selscroll(orig, -n);
}
void
selscroll(int orig, int n) {
if(sel.bx == -1)
return;
if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
sel.bx = -1;
return;
}
if(sel.by < term.top) {
sel.by = term.top;
sel.bx = 0;
}
if(sel.ey > term.bot) {
sel.ey = term.bot;
sel.ex = term.col;
}
sel.b.y = sel.by, sel.b.x = sel.bx;
sel.e.y = sel.ey, sel.e.x = sel.ex;
}
}
void
tnewline(int first_col) {
int y = term.c.y;
if(y == term.bot)
tscrollup(term.top, 1);
else
y++;
tmoveto(first_col ? 0 : term.c.x, y);
}
void
csiparse(void) {
/* int noarg = 1; */
char *p = csiescseq.buf;
csiescseq.narg = 0;
if(*p == '?')
csiescseq.priv = 1, p++;
while(p < csiescseq.buf+csiescseq.len) {
while(isdigit(*p)) {
csiescseq.arg[csiescseq.narg] *= 10;
csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
}
if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ)
csiescseq.narg++, p++;
else {
csiescseq.mode = *p;
csiescseq.narg++;
return;
}
}
}
void
tmoveto(int x, int y) {
LIMIT(x, 0, term.col-1);
LIMIT(y, 0, term.row-1);
term.c.state &= ~CURSOR_WRAPNEXT;
term.c.x = x;
term.c.y = y;
}
void
tsetchar(char *c) {
/*
* The table is proudly stolen from rxvt.
*/
if(term.c.attr.mode & ATTR_GFX) {
char *vt100_0[62] = { /* 0x41 - 0x7e */
"", "", "", "", "", "", "", /* A - G */
0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
"", "", "", "", "", "", "°", "±", /* ` - g */
"", "", "", "", "", "", "", "", /* h - o */
"", "", "", "", "", "", "", "", /* p - w */
"", "", "", "π", "", "£", "·", /* x - ~ */
};
if(c[0] >= 0x41 && c[0] <= 0x7e
&& vt100_0[c[0] - 0x41]) {
c = vt100_0[c[0] - 0x41];
}
}
term.dirty[term.c.y] = 1;
term.line[term.c.y][term.c.x] = term.c.attr;
memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
term.line[term.c.y][term.c.x].state |= GLYPH_SET;
}
void
tclearregion(int x1, int y1, int x2, int y2) {
int x, 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++) {
term.dirty[y] = 1;
for(x = x1; x <= x2; x++)
term.line[y][x].state = 0;
}
}
void
tdeletechar(int n) {
int src = term.c.x + n;
int dst = term.c.x;
int size = term.col - src;
term.dirty[term.c.y] = 1;
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;
term.dirty[term.c.y] = 1;
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) {
if(term.c.y < term.top || term.c.y > term.bot)
return;
tscrolldown(term.c.y, n);
}
void
tdeleteline(int n) {
if(term.c.y < term.top || term.c.y > term.bot)
return;
tscrollup(term.c.y, n);
}
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 \
| ATTR_ITALIC | ATTR_BLINK);
term.c.attr.fg = DefaultFG;
term.c.attr.bg = DefaultBG;
break;
case 1:
term.c.attr.mode |= ATTR_BOLD;
break;
case 3: /* enter standout (highlight) */
term.c.attr.mode |= ATTR_ITALIC;
break;
case 4:
term.c.attr.mode |= ATTR_UNDERLINE;
break;
case 5:
term.c.attr.mode |= ATTR_BLINK;
break;
case 7:
term.c.attr.mode |= ATTR_REVERSE;
break;
case 21:
case 22:
term.c.attr.mode &= ~ATTR_BOLD;
break;
case 23: /* leave standout (highlight) mode */
term.c.attr.mode &= ~ATTR_ITALIC;
break;
case 24:
term.c.attr.mode &= ~ATTR_UNDERLINE;
break;
case 25:
term.c.attr.mode &= ~ATTR_BLINK;
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(38): 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(48): 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.bg = attr[i] - 100 + 8;
else
fprintf(stderr, "erresc(default): gfx attr %d unknown\n", attr[i]), csidump();
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;
}
#define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
void
tsetmode(bool priv, bool set, int *args, int narg) {
int *lim, mode;
for(lim = args + narg; args < lim; ++args) {
if(priv) {
switch(*args) {
break;
case 1: /* DECCKM -- Cursor key */
MODBIT(term.mode, set, MODE_APPKEYPAD);
break;
case 5: /* DECSCNM -- Reverve video */
mode = term.mode;
MODBIT(term.mode, set, MODE_REVERSE);
if(mode != term.mode)
redraw();
break;
case 6: /* XXX: DECOM -- Origin */
break;
case 7: /* DECAWM -- Auto wrap */
MODBIT(term.mode, set, MODE_WRAP);
break;
case 8: /* XXX: DECARM -- Auto repeat */
break;
case 0: /* Error (IGNORED) */
case 12: /* att610 -- Start blinking cursor (IGNORED) */
break;
case 25:
MODBIT(term.c.state, !set, CURSOR_HIDE);
break;
case 1000: /* 1000,1002: enable xterm mouse report */
MODBIT(term.mode, set, MODE_MOUSEBTN);
break;
case 1002:
MODBIT(term.mode, set, MODE_MOUSEMOTION);
break;
case 1049: /* = 1047 and 1048 */
case 47:
case 1047:
if(IS_SET(MODE_ALTSCREEN))
tclearregion(0, 0, term.col-1, term.row-1);
if((set && !IS_SET(MODE_ALTSCREEN)) ||
(!set && IS_SET(MODE_ALTSCREEN))) {
tswapscreen();
}
if(*args != 1049)
break;
/* pass through */
case 1048:
tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
break;
default:
/* case 2: DECANM -- ANSI/VT52 (NOT SUPPOURTED) */
/* case 3: DECCOLM -- Column (NOT SUPPORTED) */
/* case 4: DECSCLM -- Scroll (NOT SUPPORTED) */
/* case 18: DECPFF -- Printer feed (NOT SUPPORTED) */
/* case 19: DECPEX -- Printer extent (NOT SUPPORTED) */
/* case 42: DECNRCM -- National characters (NOT SUPPORTED) */
fprintf(stderr,
"erresc: unknown private set/reset mode %d\n",
*args);
break;
}
} else {
switch(*args) {
case 0: /* Error (IGNORED) */
break;
case 2: /* KAM -- keyboard action */
MODBIT(term.mode, set, MODE_KBDLOCK);
break;
case 4: /* IRM -- Insertion-replacement */
MODBIT(term.mode, set, MODE_INSERT);
break;
case 12: /* XXX: SRM -- Send/Receive */
break;
case 20: /* LNM -- Linefeed/new line */
MODBIT(term.mode, set, MODE_CRLF);
break;
default:
fprintf(stderr,
"erresc: unknown set/reset mode %d\n",
*args);
break;
}
}
}
}
#undef MODBIT
void
csihandle(void) {
switch(csiescseq.mode) {
default:
unknown:
fprintf(stderr, "erresc: unknown csi ");
csidump();
/* die(""); */
break;
case '@': /* ICH -- Insert <n> blank char */
DEFAULT(csiescseq.arg[0], 1);
tinsertblank(csiescseq.arg[0]);
break;
case 'A': /* CUU -- Cursor <n> Up */
case 'e':
DEFAULT(csiescseq.arg[0], 1);
tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
break;
case 'B': /* CUD -- Cursor <n> Down */
DEFAULT(csiescseq.arg[0], 1);
tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
break;
case 'C': /* CUF -- Cursor <n> Forward */
case 'a':
DEFAULT(csiescseq.arg[0], 1);
tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
break;
case 'D': /* CUB -- Cursor <n> Backward */
DEFAULT(csiescseq.arg[0], 1);
tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
break;
case 'E': /* CNL -- Cursor <n> Down and first col */
DEFAULT(csiescseq.arg[0], 1);
tmoveto(0, term.c.y+csiescseq.arg[0]);
break;
case 'F': /* CPL -- Cursor <n> Up and first col */
DEFAULT(csiescseq.arg[0], 1);
tmoveto(0, term.c.y-csiescseq.arg[0]);
break;
case 'g': /* TBC -- Tabulation clear */
switch (csiescseq.arg[0]) {
case 0: /* clear current tab stop */
term.tabs[term.c.x] = 0;
break;
case 3: /* clear all the tabs */
memset(term.tabs, 0, term.col * sizeof(*term.tabs));
break;
default:
goto unknown;
}
break;
case 'G': /* CHA -- Move to <col> */
case '`': /* HPA */
DEFAULT(csiescseq.arg[0], 1);
tmoveto(csiescseq.arg[0]-1, term.c.y);
break;
case 'H': /* CUP -- Move to <row> <col> */
case 'f': /* HVP */
DEFAULT(csiescseq.arg[0], 1);
DEFAULT(csiescseq.arg[1], 1);
tmoveto(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
break;
case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
DEFAULT(csiescseq.arg[0], 1);
while(csiescseq.arg[0]--)
tputtab(1);
break;
case 'J': /* ED -- Clear screen */
sel.bx = -1;
switch(csiescseq.arg[0]) {
case 0: /* below */
tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
if(term.c.y < term.row-1)
tclearregion(0, term.c.y+1, term.col-1, term.row-1);
break;
case 1: /* above */
if(term.c.y > 1)
tclearregion(0, 0, term.col-1, term.c.y-1);
tclearregion(0, term.c.y, term.c.x, term.c.y);
break;
case 2: /* all */
tclearregion(0, 0, term.col-1, term.row-1);
break;
default:
goto unknown;
}
break;
case 'K': /* EL -- Clear line */
switch(csiescseq.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(csiescseq.arg[0], 1);
tscrollup(term.top, csiescseq.arg[0]);
break;
case 'T': /* SD -- Scroll <n> line down */
DEFAULT(csiescseq.arg[0], 1);
tscrolldown(term.top, csiescseq.arg[0]);
break;
case 'L': /* IL -- Insert <n> blank lines */
DEFAULT(csiescseq.arg[0], 1);
tinsertblankline(csiescseq.arg[0]);
break;
case 'l': /* RM -- Reset Mode */
tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
break;
case 'M': /* DL -- Delete <n> lines */
DEFAULT(csiescseq.arg[0], 1);
tdeleteline(csiescseq.arg[0]);
break;
case 'X': /* ECH -- Erase <n> char */
DEFAULT(csiescseq.arg[0], 1);
tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0], term.c.y);
break;
case 'P': /* DCH -- Delete <n> char */
DEFAULT(csiescseq.arg[0], 1);
tdeletechar(csiescseq.arg[0]);
break;
case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
DEFAULT(csiescseq.arg[0], 1);
while(csiescseq.arg[0]--)
tputtab(0);
break;
case 'd': /* VPA -- Move to <row> */
DEFAULT(csiescseq.arg[0], 1);
tmoveto(term.c.x, csiescseq.arg[0]-1);
break;
case 'h': /* SM -- Set terminal mode */
tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
break;
case 'm': /* SGR -- Terminal attribute (color) */
tsetattr(csiescseq.arg, csiescseq.narg);
break;
case 'r': /* DECSTBM -- Set Scrolling Region */
if(csiescseq.priv)
goto unknown;
else {
DEFAULT(csiescseq.arg[0], 1);
DEFAULT(csiescseq.arg[1], term.row);
tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
tmoveto(0, 0);
}
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[");
for(i = 0; i < csiescseq.len; i++) {
uint c = csiescseq.buf[i] & 0xff;
if(isprint(c)) putchar(c);
else if(c == '\n') printf("(\\n)");
else if(c == '\r') printf("(\\r)");
else if(c == 0x1b) printf("(\\e)");
else printf("(%02x)", c);
}
putchar('\n');
}
void
csireset(void) {
memset(&csiescseq, 0, sizeof(csiescseq));
}
void
strhandle(void) {
char *p;
/*
* TODO: make this being useful in case of color palette change.
*/
strparse();
p = strescseq.buf;
switch(strescseq.type) {
case ']': /* OSC -- Operating System Command */
switch(p[0]) {
case '0':
case '1':
case '2':
/*
* TODO: Handle special chars in string, like umlauts.
*/
if(p[1] == ';') {
XStoreName(xw.dpy, xw.win, strescseq.buf+2);
}
break;
case ';':
XStoreName(xw.dpy, xw.win, strescseq.buf+1);
break;
case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
break;
default:
fprintf(stderr, "erresc: unknown str ");
strdump();
break;
}
break;
case 'k': /* old title set compatibility */
XStoreName(xw.dpy, xw.win, strescseq.buf);
break;
case 'P': /* DSC -- Device Control String */
case '_': /* APC -- Application Program Command */
case '^': /* PM -- Privacy Message */
default:
fprintf(stderr, "erresc: unknown str ");
strdump();
/* die(""); */
break;
}
}
void
strparse(void) {
/*
* TODO: Implement parsing like for CSI when required.
* Format: ESC type cmd ';' arg0 [';' argn] ESC \
*/
return;
}
void
strdump(void) {
int i;
printf("ESC%c", strescseq.type);
for(i = 0; i < strescseq.len; i++) {
uint c = strescseq.buf[i] & 0xff;
if(isprint(c)) putchar(c);
else if(c == '\n') printf("(\\n)");
else if(c == '\r') printf("(\\r)");
else if(c == 0x1b) printf("(\\e)");
else printf("(%02x)", c);
}
printf("ESC\\\n");
}
void
strreset(void) {
memset(&strescseq, 0, sizeof(strescseq));
}
void
tputtab(bool forward) {
uint x = term.c.x;
if(forward) {
if(x == term.col)
return;
for(++x; x < term.col && !term.tabs[x]; ++x)
/* nothing */ ;
} else {
if(x == 0)
return;
for(--x; x > 0 && !term.tabs[x]; --x)
/* nothing */ ;
}
tmoveto(x, term.c.y);
}
void
tputc(char *c, int len) {
uchar ascii = *c;
if(iofd != -1)
write(iofd, c, len);
switch(ascii) {
case '\t':
tputtab(1);
return;
case '\b':
tmoveto(term.c.x-1, term.c.y);
return;
case '\r':
tmoveto(0, term.c.y);
return;
case '\f':
case '\v':
case '\n':
/* go to first col if the mode is set */
tnewline(IS_SET(MODE_CRLF));
return;
case '\a':
if(term.esc & ESC_STR)
break;
if(!(xw.state & WIN_FOCUSED))
xseturgency(1);
return;
case '\033':
csireset();
term.esc = ESC_START;
return;
}
if(term.esc & ESC_START) {
if(term.esc & ESC_CSI) {
csiescseq.buf[csiescseq.len++] = ascii;
if(BETWEEN(ascii, 0x40, 0x7E) || csiescseq.len >= ESC_BUF_SIZ) {
term.esc = 0;
csiparse(), csihandle();
}
} else if(term.esc & ESC_STR) {
switch(ascii) {
case '\033':
term.esc = ESC_START | ESC_STR_END;
break;
case '\a': /* backwards compatibility to xterm */
term.esc = 0;
strhandle();
break;
default:
strescseq.buf[strescseq.len++] = ascii;
if(strescseq.len+1 >= STR_BUF_SIZ) {
term.esc = 0;
strhandle();
}
}
} else if(term.esc & ESC_STR_END) {
term.esc = 0;
if(ascii == '\\')
strhandle();
} else if(term.esc & ESC_ALTCHARSET) {
switch(ascii) {
case '0': /* Line drawing set */
term.c.attr.mode |= ATTR_GFX;
break;
case 'B': /* USASCII */
term.c.attr.mode &= ~ATTR_GFX;
break;
case 'A': /* UK (IGNORED) */
case '<': /* multinational charset (IGNORED) */
case '5': /* Finnish (IGNORED) */
case 'C': /* Finnish (IGNORED) */
case 'K': /* German (IGNORED) */
break;
default:
fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
}
term.esc = 0;
} else {
switch(ascii) {
case '[':
term.esc |= ESC_CSI;
break;
case 'P': /* DCS -- Device Control String */
case '_': /* APC -- Application Program Command */
case '^': /* PM -- Privacy Message */
case ']': /* OSC -- Operating System Command */
case 'k': /* old title set compatibility */
strreset();
strescseq.type = ascii;
term.esc |= ESC_STR;
break;
case '(': /* set primary charset G0 */
term.esc |= ESC_ALTCHARSET;
break;
case ')': /* set secondary charset G1 (IGNORED) */
case '*': /* set tertiary charset G2 (IGNORED) */
case '+': /* set quaternary charset G3 (IGNORED) */
term.esc = 0;
break;
case 'D': /* IND -- Linefeed */
if(term.c.y == term.bot)
tscrollup(term.top, 1);
else
tmoveto(term.c.x, term.c.y+1);
term.esc = 0;
break;
case 'E': /* NEL -- Next line */
tnewline(1); /* always go to first col */
term.esc = 0;
break;
case 'H': /* HTS -- Horizontal tab stop */
term.tabs[term.c.x] = 1;
term.esc = 0;
break;
case 'M': /* RI -- Reverse index */
if(term.c.y == term.top)
tscrolldown(term.top, 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;
xclearborders();
xresettitle();
break;
case '=': /* DECPAM -- Application keypad */
term.mode |= MODE_APPKEYPAD;
term.esc = 0;
break;
case '>': /* DECPNM -- Normal keypad */
term.mode &= ~MODE_APPKEYPAD;
term.esc = 0;
break;
case '7': /* DECSC -- Save Cursor */
tcursor(CURSOR_SAVE);
term.esc = 0;
break;
case '8': /* DECRC -- Restore Cursor */
tcursor(CURSOR_LOAD);
term.esc = 0;
break;
case '\\': /* ST -- Stop */
term.esc = 0;
break;
default:
fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
(uchar) ascii, isprint(ascii)?ascii:'.');
term.esc = 0;
}
}
} else {
if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
sel.bx = -1;
if(ascii >= '\020' || term.c.attr.mode & ATTR_GFX) {
if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
tnewline(1); /* always go to first col */
tsetchar(c);
if(term.c.x+1 < term.col)
tmoveto(term.c.x+1, term.c.y);
else
term.c.state |= CURSOR_WRAPNEXT;
}
}
}
int
tresize(int col, int row) {
int i, x;
int minrow = MIN(row, term.row);
int mincol = MIN(col, term.col);
int slide = term.c.y - row + 1;
if(col < 1 || row < 1)
return 0;
/* free unneeded rows */
i = 0;
if(slide > 0) {
/* slide screen to keep cursor where we expect it -
* tscrollup would work here, but we can optimize to
* memmove because we're freeing the earlier lines */
for(/* i = 0 */; i < slide; i++) {
free(term.line[i]);
free(term.alt[i]);
}
memmove(term.line, term.line + slide, row * sizeof(Line));
memmove(term.alt, term.alt + slide, row * sizeof(Line));
}
for(i += row; i < term.row; i++) {
free(term.line[i]);
free(term.alt[i]);
}
/* resize to new height */
term.line = xrealloc(term.line, row * sizeof(Line));
term.alt = xrealloc(term.alt, row * sizeof(Line));
term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
/* resize each row to new width, zero-pad if needed */
for(i = 0; i < minrow; i++) {
term.dirty[i] = 1;
term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
term.alt[i] = xrealloc(term.alt[i], col * sizeof(Glyph));
for(x = mincol; x < col; x++) {
term.line[i][x].state = 0;
term.alt[i][x].state = 0;
}
}
/* allocate any new rows */
for(/* i == minrow */; i < row; i++) {
term.dirty[i] = 1;
term.line[i] = xcalloc(col, sizeof(Glyph));
term.alt [i] = xcalloc(col, sizeof(Glyph));
}
if(col > term.col) {
bool *bp = term.tabs + term.col;
memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
while(--bp > term.tabs && !*bp)
/* nothing */ ;
for(bp += TAB; bp < term.tabs + col; bp += TAB)
*bp = 1;
}
/* update terminal size */
term.col = col, term.row = row;
/* make use of the LIMIT in tmoveto */
tmoveto(term.c.x, term.c.y);
/* reset scrolling region */
tsetscroll(0, row-1);
return (slide > 0);
}
void
xresize(int col, int row) {
xw.tw = MAX(1, 2*BORDER + col * xw.cw);
xw.th = MAX(1, 2*BORDER + row * xw.ch);
XftDrawChange(xw.xft_draw, xw.buf);
}
void
xloadcols(void) {
int i, r, g, b;
XRenderColor xft_color = { .alpha = 0 };
/* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
for(i = 0; i < LEN(colorname); i++) {
if(!colorname[i])
continue;
if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.xft_col[i])) {
die("Could not allocate color '%s'\n", colorname[i]);
}
}
/* load colors [16-255] ; same colors as xterm */
for(i = 16, r = 0; r < 6; r++)
for(g = 0; g < 6; g++)
for(b = 0; b < 6; b++) {
xft_color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
xft_color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
xft_color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &xft_color, &dc.xft_col[i])) {
die("Could not allocate color %d\n", i);
}
i++;
}
for(r = 0; r < 24; r++, i++) {
xft_color.red = xft_color.green = xft_color.blue = 0x0808 + 0x0a0a * r;
if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &xft_color, &dc.xft_col[i])) {
dc.xft_col[i] = dc.xft_col[256];
fprintf(stderr, "Could not allocate color %d\n", i);
}
}
}
void
xtermclear(int col1, int row1, int col2, int row2) {
XftDrawRect(xw.xft_draw,
&dc.xft_col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG],
BORDER + col1 * xw.cw,
BORDER + row1 * xw.ch,
(col2-col1+1) * xw.cw,
(row2-row1+1) * xw.ch);
}
/*
* Absolute coordinates.
*/
void
xclear(int x1, int y1, int x2, int y2) {
XftDrawRect(xw.xft_draw,
&dc.xft_col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG],
x1, y1, x2-x1, y2-y1);
}
void
xclearborders(void) {
/* top and left border */
xclear(0, 0, BORDER, xw.h);
xclear(0, 0, xw.w, BORDER);
/* lower and right border */
xclear(BORDER, xw.th - 1, xw.w, xw.h);
/* Will just draw what hasn't been drawn by the previous call. */
xclear(xw.tw - 1, BORDER, xw.w, xw.h - xw.th - 2);
}
void
xhints(void) {
XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
XWMHints wm = {.flags = InputHint, .input = 1};
XSizeHints *sizeh = NULL;
sizeh = XAllocSizeHints();
if(xw.isfixed == False) {
sizeh->flags = PSize | PResizeInc | PBaseSize;
sizeh->height = xw.h;
sizeh->width = xw.w;
sizeh->height_inc = xw.ch;
sizeh->width_inc = xw.cw;
sizeh->base_height = 2*BORDER;
sizeh->base_width = 2*BORDER;
} else {
sizeh->flags = PMaxSize | PMinSize;
sizeh->min_width = sizeh->max_width = xw.fw;
sizeh->min_height = sizeh->max_height = xw.fh;
}
XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
XFree(sizeh);
}
void
xinitfont(Font *f, char *fontstr) {
f->xft_set = XftFontOpenName(xw.dpy, xw.scr, fontstr);
if(!f->xft_set)
die("st: can't open font %s.\n", fontstr);
f->ascent = f->xft_set->ascent;
f->descent = f->xft_set->descent;
f->lbearing = 0;
f->rbearing = f->xft_set->max_advance_width;
}
void
initfonts(char *fontstr) {
char *fstr;
xinitfont(&dc.font, fontstr);
fstr = smstrcat(fontstr, ":weight=bold", NULL);
xinitfont(&dc.bfont, fstr);
free(fstr);
fstr = smstrcat(fontstr, ":slant=italic,oblique", NULL);
xinitfont(&dc.ifont, fstr);
free(fstr);
fstr = smstrcat(fontstr, ":weight=bold:slant=italic,oblique", NULL);
xinitfont(&dc.ibfont, fstr);
free(fstr);
}
void
xinit(void) {
XSetWindowAttributes attrs;
Cursor cursor;
Window parent;
int sw, sh, major, minor;
if(!(xw.dpy = XOpenDisplay(NULL)))
die("Can't open display\n");
xw.scr = XDefaultScreen(xw.dpy);
xw.vis = XDefaultVisual(xw.dpy, xw.scr);
/* font */
initfonts((opt_font != NULL)? opt_font : FONT);
/* XXX: Assuming same size for bold font */
xw.cw = dc.font.rbearing - dc.font.lbearing;
xw.ch = dc.font.ascent + dc.font.descent;
/* colors */
xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
xloadcols();
/* adjust fixed window geometry */
if(xw.isfixed) {
sw = DisplayWidth(xw.dpy, xw.scr);
sh = DisplayHeight(xw.dpy, xw.scr);
if(xw.fx < 0)
xw.fx = sw + xw.fx - xw.fw - 1;
if(xw.fy < 0)
xw.fy = sh + xw.fy - xw.fh - 1;
xw.h = xw.fh;
xw.w = xw.fw;
} else {
/* window - default size */
xw.h = 2*BORDER + term.row * xw.ch;
xw.w = 2*BORDER + term.col * xw.cw;
xw.fx = 0;
xw.fy = 0;
}
attrs.background_pixel = dc.xft_col[DefaultBG].pixel;
attrs.border_pixel = dc.xft_col[DefaultBG].pixel;
attrs.bit_gravity = NorthWestGravity;
attrs.event_mask = FocusChangeMask | KeyPressMask
| ExposureMask | VisibilityChangeMask | StructureNotifyMask
| ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
attrs.colormap = xw.cmap;
parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
xw.vis,
CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
| CWColormap,
&attrs);
/* double buffering */
if(!XdbeQueryExtension(xw.dpy, &major, &minor))
die("Xdbe extension is not present\n");
xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
/* Xft rendering context */
xw.xft_draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
/* input methods */
xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
| XIMStatusNothing, XNClientWindow, xw.win,
XNFocusWindow, xw.win, NULL);
/* gc */
dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
/* white cursor, black outline */
cursor = XCreateFontCursor(xw.dpy, XC_xterm);
XDefineCursor(xw.dpy, xw.win, cursor);
XRecolorCursor(xw.dpy, cursor,
&(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
&(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
xresettitle();
XMapWindow(xw.dpy, xw.win);
xhints();
XSync(xw.dpy, 0);
}
void
xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
int fg = base.fg, bg = base.bg, temp;
int winx = BORDER+x*xw.cw, winy = BORDER+y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
Font *font = &dc.font;
XGlyphInfo extents;
/* only switch default fg/bg if term is in RV mode */
if(IS_SET(MODE_REVERSE)) {
if(fg == DefaultFG)
fg = DefaultBG;
if(bg == DefaultBG)
bg = DefaultFG;
}
if(base.mode & ATTR_REVERSE)
temp = fg, fg = bg, bg = temp;
if(base.mode & ATTR_BOLD) {
fg += 8;
font = &dc.bfont;
}
if(base.mode & ATTR_ITALIC)
font = &dc.ifont;
if(base.mode & (ATTR_ITALIC|ATTR_ITALIC))
font = &dc.ibfont;
XftTextExtentsUtf8(xw.dpy, font->xft_set, (FcChar8 *)s, bytelen, &extents);
width = extents.xOff;
XftDrawRect(xw.xft_draw, &dc.xft_col[bg], winx, winy - font->ascent, width, xw.ch);
XftDrawStringUtf8(xw.xft_draw, &dc.xft_col[fg], font->xft_set, winx, winy, (FcChar8 *)s, bytelen);
if(base.mode & ATTR_UNDERLINE) {
XftDrawRect(xw.xft_draw, &dc.xft_col[fg], winx, winy+1,
width, 1);
}
}
void
xdrawcursor(void) {
static int oldx = 0;
static int oldy = 0;
int sl;
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)
memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
/* remove the old cursor */
if(term.line[oldy][oldx].state & GLYPH_SET) {
sl = utf8size(term.line[oldy][oldx].c);
xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
} else
xtermclear(oldx, oldy, oldx, oldy);
/* draw the new one */
if(!(term.c.state & CURSOR_HIDE)) {
if(!(xw.state & WIN_FOCUSED))
g.bg = DefaultUCS;
if(IS_SET(MODE_REVERSE))
g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
sl = utf8size(g.c);
xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
oldx = term.c.x, oldy = term.c.y;
}
}
void
xresettitle(void) {
XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
}
void
redraw(void) {
struct timespec tv = {0, REDRAW_TIMEOUT * 1000};
xclearborders();
tfulldirt();
draw();
XSync(xw.dpy, False); /* necessary for a good tput flash */
nanosleep(&tv, NULL);
}
void
draw(void) {
XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
drawregion(0, 0, term.col, term.row);
XdbeSwapBuffers(xw.dpy, swpinfo, 1);
}
void
drawregion(int x1, int y1, int x2, int y2) {
int ic, ib, x, y, ox, sl;
Glyph base, new;
char buf[DRAW_BUF_SIZ];
bool ena_sel = sel.bx != -1, alt = IS_SET(MODE_ALTSCREEN);
if((sel.alt && !alt) || (!sel.alt && alt))
ena_sel = 0;
if(!(xw.state & WIN_VISIBLE))
return;
for(y = y1; y < y2; y++) {
if(!term.dirty[y])
continue;
xtermclear(0, y, term.col, y);
term.dirty[y] = 0;
base = term.line[y][0];
ic = ib = ox = 0;
for(x = x1; x < x2; x++) {
new = term.line[y][x];
if(ena_sel && *(new.c) && selected(x, y))
new.mode ^= ATTR_REVERSE;
if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
xdraws(buf, base, ox, y, ic, ib);
ic = ib = 0;
}
if(new.state & GLYPH_SET) {
if(ib == 0) {
ox = x;
base = new;
}
sl = utf8size(new.c);
memcpy(buf+ib, new.c, sl);
ib += sl;
++ic;
}
}
if(ib > 0)
xdraws(buf, base, ox, y, ic, ib);
}
xdrawcursor();
}
void
expose(XEvent *ev) {
XExposeEvent *e = &ev->xexpose;
if(xw.state & WIN_REDRAW) {
if(!e->count)
xw.state &= ~WIN_REDRAW;
}
}
void
visibility(XEvent *ev) {
XVisibilityEvent *e = &ev->xvisibility;
if(e->state == VisibilityFullyObscured)
xw.state &= ~WIN_VISIBLE;
else if(!(xw.state & WIN_VISIBLE))
/* need a full redraw for next Expose, not just a buf copy */
xw.state |= WIN_VISIBLE | WIN_REDRAW;
}
void
unmap(XEvent *ev) {
xw.state &= ~WIN_VISIBLE;
}
void
xseturgency(int add) {
XWMHints *h = XGetWMHints(xw.dpy, xw.win);
h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
XSetWMHints(xw.dpy, xw.win, h);
XFree(h);
}
void
focus(XEvent *ev) {
if(ev->type == FocusIn) {
xw.state |= WIN_FOCUSED;
xseturgency(0);
} else
xw.state &= ~WIN_FOCUSED;
}
char*
kmap(KeySym k, uint state) {
int i;
state &= ~Mod2Mask;
for(i = 0; i < LEN(key); i++) {
uint mask = key[i].mask;
if(key[i].k == k && ((state & mask) == mask || (mask == XK_NO_MOD && !state)))
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;
Status status;
if (IS_SET(MODE_KBDLOCK))
return;
meta = e->state & Mod1Mask;
shift = e->state & ShiftMask;
len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
/* 1. custom keys from config.h */
if((customkey = kmap(ksym, e->state)))
ttywrite(customkey, strlen(customkey));
/* 2. hardcoded (overrides X lookup) */
else
switch(ksym) {
case XK_Up:
case XK_Down:
case XK_Left:
case XK_Right:
/* XXX: shift up/down doesn't work */
sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
ttywrite(buf, 3);
break;
case XK_Insert:
if(shift)
selpaste();
break;
case XK_Return:
if(IS_SET(MODE_CRLF))
ttywrite("\r\n", 2);
else
ttywrite("\r", 1);
break;
/* 3. X lookup */
default:
if(len > 0) {
if(meta && len == 1)
ttywrite("\033", 1);
ttywrite(buf, len);
}
break;
}
}
void
cmessage(XEvent *e) {
/* See xembed specs
http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
xw.state |= WIN_FOCUSED;
xseturgency(0);
} else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
xw.state &= ~WIN_FOCUSED;
}
}
}
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;
col = (xw.w - 2*BORDER) / xw.cw;
row = (xw.h - 2*BORDER) / xw.ch;
if(col == term.col && row == term.row)
return;
tresize(col, row);
xresize(col, row);
xclearborders();
ttyresize();
}
void
run(void) {
XEvent ev;
fd_set rfd;
int xfd = XConnectionNumber(xw.dpy), i;
struct timeval drawtimeout, *tv = NULL;
for(i = 0;; i++) {
FD_ZERO(&rfd);
FD_SET(cmdfd, &rfd);
FD_SET(xfd, &rfd);
if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
if(errno == EINTR)
continue;
die("select failed: %s\n", SERRNO);
}
/*
* Stop after a certain number of reads so the user does not
* feel like the system is stuttering.
*/
if(i < 1000 && FD_ISSET(cmdfd, &rfd)) {
ttyread();
/*
* Just wait a bit so it isn't disturbing the
* user and the system is able to write something.
*/
drawtimeout.tv_sec = 0;
drawtimeout.tv_usec = 5;
tv = &drawtimeout;
continue;
}
i = 0;
tv = NULL;
while(XPending(xw.dpy)) {
XNextEvent(xw.dpy, &ev);
if(XFilterEvent(&ev, xw.win))
continue;
if(handler[ev.type])
(handler[ev.type])(&ev);
}
draw();
XFlush(xw.dpy);
}
}
int
main(int argc, char *argv[]) {
int i, bitm, xr, yr;
uint wr, hr;
xw.fw = xw.fh = xw.fx = xw.fy = 0;
xw.isfixed = False;
for(i = 1; i < argc; i++) {
switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
case 'c':
if(++i < argc)
opt_class = argv[i];
break;
case 'e':
/* eat every remaining arguments */
if(++i < argc)
opt_cmd = &argv[i];
goto run;
case 'f':
if(++i < argc)
opt_font = argv[i]