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st.c
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st.c
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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 <pwd.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 <SDL.h>
#include <SDL_thread.h>
#include <SDL_ttf.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>
#elif defined(__QNXNTO__)
#include <unix.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] [-e command ...]\n"
/* 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 */
/* macros */
#define CLEANMASK(mask) (mask & (KMOD_SHIFT|KMOD_CTRL|KMOD_ALT|KMOD_META))
#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 VT102ID "\033[?6c"
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 */
ESC_TEST = 32, /* Enter in test mode */
};
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 {
//Colormap cmap;
SDL_Surface *win;
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 {
SDLKey k;
SDLMod 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;
typedef union {
int i;
unsigned int ui;
float f;
const void *v;
} Arg;
typedef struct {
SDLMod mod;
SDLKey keysym;
void (*func)(const Arg *);
const Arg arg;
} Shortcut;
/* function definitions used in config.h */
static void xzoom(const Arg *);
static void changefontmode(const Arg *);
/* Config.h for applying patches and the configuration. */
#include "st.h"
/* Drawing Context */
typedef struct {
SDL_Color colors[LEN(colormap) < 256 ? 256 : LEN(colormap)];
TTF_Font *font, *bfont;
} DC;
static void die(const char *, ...);
static bool is_word_break(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 *, Glyph *, int, int);
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 xclear(int, int, int, int);
static void xdrawcursor(void);
static void sdlinit(void);
static void initcolormap(void);
static void sdlresettitle(void);
static void xsetsel(char*);
static void sdltermclear(int, int, int, int);
static void xresize(int, int);
static void expose(SDL_Event *);
static void visibility(SDL_Event *);
static void unmap(SDL_Event *);
static char *kmap(SDLKey, SDLMod);
static void kpress(SDL_Event *);
static void cresize(int width, int height);
static void resize(SDL_Event *);
static void focus(SDL_Event *);
static void activeEvent(SDL_Event *);
static void brelease(SDL_Event *);
static void bpress(SDL_Event *);
static void bmotion(SDL_Event *);
static void selnotify(SDL_Event *);
static void selclear(SDL_Event *);
static void selrequest(SDL_Event *);
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 ssize_t xwrite(int, char *, size_t);
static void *xmalloc(size_t);
static void *xrealloc(void *, size_t);
static void *xcalloc(size_t nmemb, size_t size);
static void xflip(void);
static void (*handler[SDL_NUMEVENTS])(SDL_Event *) = {
[SDL_KEYDOWN] = kpress,
[SDL_VIDEORESIZE] = resize,
[SDL_VIDEOEXPOSE] = expose,
[SDL_ACTIVEEVENT] = activeEvent,
[SDL_MOUSEMOTION] = bmotion,
[SDL_MOUSEBUTTONDOWN] = bpress,
[SDL_MOUSEBUTTONUP] = brelease,
#if 0
[SelectionClear] = selclear,
[SelectionNotify] = selnotify,
[SelectionRequest] = selrequest,
#endif
};
/* 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_class = NULL;
static char *opt_font = NULL;
static char *usedfont = NULL;
static int usedfontsize = 0;
ssize_t
xwrite(int fd, char *s, size_t len) {
size_t aux = len;
while(len > 0) {
ssize_t r = write(fd, s, len);
if(r < 0)
return r;
len -= r;
s += r;
}
return aux;
}
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;
}
void
xflip(void) {
if(SDL_Flip(xw.win)) {
fputs("FLIP ERROR\n", stderr);
exit(EXIT_FAILURE);
}
}
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) {
// TODO
#if 0
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;
#endif
}
static int
x2col(int x) {
x -= borderpx;
x /= xw.cw;
return LIMIT(x, 0, term.col-1);
}
static int
y2row(int y) {
y -= borderpx;
y /= xw.ch;
return LIMIT(y, 0, term.row-1);
}
static inline bool
selected(int x, int y) {
int bx, ex;
if(sel.ey == y && sel.by == y) {
bx = MIN(sel.bx, sel.ex);
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(SDL_Event *e, int *b, int *x, int *y) {
if(b)
*b = e->button.button;
*x = x2col(e->button.x);
*y = y2row(e->button.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(SDL_Event *e) {
int x = x2col(e->button.x);
int y = y2row(e->button.y);
int button = e->button.button;
char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
static int ob, ox, oy;
/* from urxvt */
if(e->type == SDL_MOUSEMOTION) {
if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
return;
button = ob + 32;
ox = x, oy = y;
} else if(e->button.type == SDL_MOUSEBUTTONUP) {
button = 3;
} else {
button -= SDL_BUTTON_LEFT;
if(button >= 3)
button += 64 - 3;
if(e->button.type == SDL_MOUSEBUTTONDOWN) {
ob = button;
ox = x, oy = y;
}
}
//TODO
#if 0
buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
+ (state & Mod4Mask ? 8 : 0)
+ (state & ControlMask ? 16 : 0);
#endif
buf[3] = 32 + button;
ttywrite(buf, sizeof(buf));
}
void
bpress(SDL_Event *e) {
if(IS_SET(MODE_MOUSE)) {
mousereport(e);
} else if(e->button.button == SDL_BUTTON_LEFT) {
if(sel.bx != -1) {
sel.bx = -1;
tsetdirt(sel.b.y, sel.e.y);
draw();
}
sel.mode = 1;
sel.ex = sel.bx = x2col(e->button.x);
sel.ey = sel.by = y2row(e->button.y);
}
}
void
selcopy(void) {
char *str, *ptr, *p;
int x, y, bufsize, is_selected = 0, size;
Glyph *gp, *last;
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++) {
gp = &term.line[y][0];
last = gp + term.col;
while(--last >= gp && !(last->state & GLYPH_SET))
/* nothing */;
for(x = 0; gp <= last; x++, ++gp) {
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(SDL_Event *e) {
(void)e;
// TODO
#if 0
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);
#endif
}
void
selpaste(void) {
// TODO
#if 0
XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
xw.win, CurrentTime);
#endif
}
void selclear(SDL_Event *e) {
(void)e;
if(sel.bx == -1)
return;
sel.bx = -1;
tsetdirt(sel.b.y, sel.e.y);
}
void
selrequest(SDL_Event *e) {
(void)e;
// TODO
#if 0
XSelectionRequestEvent *xsre;
XSelectionEvent xev;
Atom xa_targets, string;
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 */
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");
#endif
}
void
xsetsel(char *str) {
(void)str;
// TODO
# if 0
/* 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);
#endif
}
void
brelease(SDL_Event *e) {
struct timeval now;
if(IS_SET(MODE_MOUSE)) {
mousereport(e);
return;
}
if(e->button.button == SDL_BUTTON_MIDDLE) {
selpaste();
} else if(e->button.button == SDL_BUTTON_LEFT) {
sel.mode = 0;
getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
term.dirty[sel.ey] = 1;
if(sel.bx == sel.ex && sel.by == sel.ey) {
sel.bx = -1;
gettimeofday(&now, NULL);
if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
/* 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) <= doubleclicktimeout) {
/* double click to select word */
sel.bx = sel.ex;
while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
!is_word_break(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 &&
!is_word_break(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(SDL_Event *e) {
int starty, endy, oldey, oldex;
if(IS_SET(MODE_MOUSE)) {
mousereport(e);
return;
}
if(sel.mode) {
oldey = sel.ey;
oldex = sel.ex;
getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
if(oldey != sel.ey || oldex != sel.ex) {
starty = MIN(oldey, sel.ey);
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);
}
bool
is_word_break(char c) {
static char *word_break = WORD_BREAK;
char *s = word_break;
while(*s) {
if(*s == c) return true;
s++;
}
return false;
}
void
execsh(void) {
char **args;
char *envshell = getenv("SHELL");
const struct passwd *pass = getpwuid(getuid());
#if 0
char buf[sizeof(long) * 8 + 1];
#endif
unsetenv("COLUMNS");
unsetenv("LINES");
unsetenv("TERMCAP");
if(pass) {
setenv("LOGNAME", pass->pw_name, 1);
setenv("USER", pass->pw_name, 1);
setenv("SHELL", pass->pw_shell, 0);
setenv("HOME", pass->pw_dir, 0);
}
#if 0
snprintf(buf, sizeof(buf), "%lu", xw.win);
setenv("WINDOWID", buf, 1);
#endif
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);
setenv("TERM", termname, 1);
args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
execvp(args[0], args);
exit(EXIT_FAILURE);
}
void
sigchld(int a) {
int stat = 0;
(void)a;
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;
struct winsize w = {term.row, term.col, 0, 0};
/* seems to work fine on linux, openbsd and freebsd */
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) {
iofd = (!strcmp(opt_io, "-")) ?
STDOUT_FILENO :
open(opt_io, O_WRONLY | O_CREAT, 0666);
if(iofd < 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");
}