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flarity.c
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flarity.c
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/* See LICENSE for license details. */
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pwd.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/types.h>
#include <sys/wait.h>
#include <termios.h>
#include <unistd.h>
#include <wchar.h>
#include "flarity.h"
#include "win.h"
#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
#if defined(__OpenBSD__)
#include <sys/sysctl.h>
#endif
/* Arbitrary sizes */
#define UTF_INVALID 0xFFFD
#define UTF_SIZ 4
#define ESC_BUF_SIZ (128*UTF_SIZ)
#define ESC_ARG_SIZ 16
#define CAR_PER_ARG 4
#define STR_BUF_SIZ ESC_BUF_SIZ
#define STR_ARG_SIZ ESC_ARG_SIZ
#define HISTSIZE 2000
#define RESIZEBUFFER 1000
/* macros */
#define IS_SET(flag) ((term.mode & (flag)) != 0)
#define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == 0x7f)
#define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
#define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
#define ISDELIM(u) (u && wcschr(worddelimiters, u))
#define STRESCARGREST(n) ((n) == 0 ? strescseq.buf : strescseq.argp[(n)-1] + 1)
#define STRESCARGJUST(n) (*(strescseq.argp[n]) = '\0', STRESCARGREST(n))
#define TLINE(y) ( \
(y) < term.scr ? term.hist[(term.histi + (y) - term.scr + 1 + HISTSIZE) % HISTSIZE] \
: term.line[(y) - term.scr] \
)
#define TLINEABS(y) ( \
(y) < 0 ? term.hist[(term.histi + (y) + 1 + HISTSIZE) % HISTSIZE] : term.line[(y)] \
)
#define UPDATEWRAPNEXT(alt, col) do { \
if ((term.c.state & CURSOR_WRAPNEXT) && term.c.x + term.wrapcwidth[alt] < col) { \
term.c.x += term.wrapcwidth[alt]; \
term.c.state &= ~CURSOR_WRAPNEXT; \
} \
} while (0);
char last_url[512];
enum term_mode {
MODE_WRAP = 1 << 0,
MODE_INSERT = 1 << 1,
MODE_ALTSCREEN = 1 << 2,
MODE_CRLF = 1 << 3,
MODE_ECHO = 1 << 4,
MODE_PRINT = 1 << 5,
MODE_UTF8 = 1 << 6,
};
enum scroll_mode {
SCROLL_RESIZE = -1,
SCROLL_NOSAVEHIST = 0,
SCROLL_SAVEHIST = 1
};
enum cursor_movement {
CURSOR_SAVE,
CURSOR_LOAD
};
enum cursor_state {
CURSOR_DEFAULT = 0,
CURSOR_WRAPNEXT = 1,
CURSOR_ORIGIN = 2
};
enum charset {
CS_GRAPHIC0,
CS_GRAPHIC1,
CS_UK,
CS_USA,
CS_MULTI,
CS_GER,
CS_FIN
};
enum escape_state {
ESC_START = 1,
ESC_CSI = 2,
ESC_STR = 4, /* DCS, OSC, PM, APC */
ESC_ALTCHARSET = 8,
ESC_STR_END = 16, /* a final string was encountered */
ESC_TEST = 32, /* Enter in test mode */
ESC_UTF8 = 64,
};
typedef struct {
Glyph attr; /* current char attributes */
int x;
int y;
char state;
} TCursor;
typedef struct {
int mode;
int type;
int snap;
/*
* Selection variables:
* nb – normalized coordinates of the beginning of the selection
* ne – normalized coordinates of the end of the selection
* ob – original coordinates of the beginning of the selection
* oe – original coordinates of the end of the selection
*/
struct {
int x, y;
} nb, ne, ob, oe;
int alt;
} Selection;
/* Internal representation of the screen */
typedef struct {
int col; /* nb screen col */
int row; /* nb screen row */
Line *line; /* screen */
Line hist[HISTSIZE]; /* history buffer */
int histi; /* history index */
int histf; /* nb history available */
int scr; /* scroll back */
int *dirty; /* dirtyness of lines */
TCursor c; /* cursor */
int ocx; /* old cursor col */
int ocy; /* old cursor row */
int top; /* top scroll limit */
int bot; /* bottom scroll limit */
int mode; /* terminal mode flags */
int esc; /* escape state flags */
char trantbl[4]; /* charset table translation */
int charset; /* current charset */
int icharset; /* selected charset for sequence */
int *tabs; /* tab marks */
Rune lastc; /* last printed char outside of sequence,
0 if control */
int wrapcwidth[2]; /* used in updating WRAPNEXT when resizing */
} Term;
/* CSI Escape sequence structs */
/* ESC '[' [[ [<priv>] <arg> [;]] <mode> [<mode>]] */
typedef struct {
char buf[ESC_BUF_SIZ]; /* raw string */
size_t len; /* raw string length */
char priv;
int arg[ESC_ARG_SIZ];
int narg; /* nb of args */
int carg[ESC_ARG_SIZ][CAR_PER_ARG]; /* colon args */
char mode[2];
} CSIEscape;
/* STR Escape sequence structs */
/* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
typedef struct {
char type; /* ESC type ... */
char *buf; /* allocated raw string */
size_t siz; /* allocation size */
size_t len; /* raw string length */
char *argp[STR_ARG_SIZ]; /* pointers to the end of nth argument */
int narg; /* nb of args */
} STREscape;
static void execsh(char *, char **);
static char *getcwd_by_pid(pid_t pid);
static void stty(char **);
static void sigchld(int);
static void ttywriteraw(const char *, size_t);
static void csidump(void);
static void csihandle(void);
static void readcolonargs(char **, int, int[][CAR_PER_ARG]);
static void csiparse(void);
static void csireset(void);
static int eschandle(uchar);
static void strdump(void);
static void strhandle(void);
static void strparse(void);
static void strreset(void);
static void tprinter(char *, size_t);
static void tdumpsel(void);
static void tdumpline(int);
static void tdump(void);
static void tclearglyph(Glyph *, int);
static void tclearregion(int, int, int, int, int);
static void tresetcursor(void);
static void tdeletechar(int);
static void tdeleteline(int);
static void tinsertblank(int);
static void tinsertblankline(int);
static int tlinelen(Line line);
static int tiswrapped(Line line);
static char *tgetglyphs(char *, const Glyph *, const Glyph *);
static size_t tgetline(char *, const Glyph *);
static void tmoveto(int, int);
static void tmoveato(int, int);
static void tnewline(int);
static void tputtab(int);
static void tputc(Rune);
static void treset(void);
static void tscrollup(int, int, int, int);
static void tscrolldown(int, int);
static void treflow(int, int);
static void rscrolldown(int);
static void tresizedef(int, int);
static void tresizealt(int, int);
static void tsetattr(const int *, int);
static void tsetchar(Rune, const Glyph *, int, int);
static void tsetdirt(int, int);
static void tsetscroll(int, int);
static void tswapscreen(void);
static void tloaddefscreen(int, int);
static void tloadaltscreen(int, int);
static void tsetmode(int, int, const int *, int);
static int twrite(const char *, int, int);
static void tcontrolcode(uchar);
static void tdectest(char);
static void tdefutf8(char);
static int32_t tdefcolor(const int *, int *, int);
static void tdeftran(char);
static void tstrsequence(uchar);
static void drawregion(int, int, int, int);
static void selnormalize(void);
static void selmove(int);
static void selremove(void);
static void selscroll(int, int, int);
static int regionselected(int, int, int, int);
static void selsnap(int *, int *, int);
static size_t utf8decode(const char *, Rune *, size_t);
static Rune utf8decodebyte(char, size_t *);
static char utf8encodebyte(Rune, size_t);
static size_t utf8validate(Rune *, size_t);
static char *base64dec(const char *);
static char base64dec_getc(const char **);
static ssize_t xwrite(int, const char *, size_t);
/* Globals */
static Term term;
static Selection sel;
static CSIEscape csiescseq;
static STREscape strescseq;
static int iofd = 1;
static int cmdfd;
static pid_t pid;
static uchar utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
static Rune utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000};
static Rune utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
int
subprocwd(char *path)
{
#if defined(__linux)
if (snprintf(path, PATH_MAX, "/proc/%d/cwd", pid) < 0)
return -1;
return 0;
#elif defined(__OpenBSD__)
size_t sz = PATH_MAX;
int name[3] = {CTL_KERN, KERN_PROC_CWD, pid};
if (sysctl(name, 3, path, &sz, 0, 0) == -1)
return -1;
return 0;
#endif
}
ssize_t
xwrite(int fd, const char *s, size_t len)
{
size_t aux = len;
ssize_t r;
while (len > 0) {
r = write(fd, s, len);
if (r < 0)
return r;
len -= r;
s += r;
}
return aux;
}
void *
xmalloc(size_t len)
{
void *p;
if (!(p = malloc(len)))
die("malloc: %s\n", strerror(errno));
return p;
}
void *
xrealloc(void *p, size_t len)
{
if ((p = realloc(p, len)) == NULL)
die("realloc: %s\n", strerror(errno));
return p;
}
char *
xstrdup(char *s)
{
if ((s = strdup(s)) == NULL)
die("strdup: %s\n", strerror(errno));
return s;
}
size_t
utf8decode(const char *c, Rune *u, size_t clen)
{
size_t i, j, len, type;
Rune udecoded;
*u = UTF_INVALID;
if (!clen)
return 0;
udecoded = utf8decodebyte(c[0], &len);
if (!BETWEEN(len, 1, UTF_SIZ))
return 1;
for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
if (type != 0)
return j;
}
if (j < len)
return 0;
*u = udecoded;
utf8validate(u, len);
return len;
}
Rune
utf8decodebyte(char c, size_t *i)
{
for (*i = 0; *i < LEN(utfmask); ++(*i))
if (((uchar)c & utfmask[*i]) == utfbyte[*i])
return (uchar)c & ~utfmask[*i];
return 0;
}
size_t
utf8encode(Rune u, char *c)
{
size_t len, i;
len = utf8validate(&u, 0);
if (len > UTF_SIZ)
return 0;
for (i = len - 1; i != 0; --i) {
c[i] = utf8encodebyte(u, 0);
u >>= 6;
}
c[0] = utf8encodebyte(u, len);
return len;
}
char
utf8encodebyte(Rune u, size_t i)
{
return utfbyte[i] | (u & ~utfmask[i]);
}
size_t
utf8validate(Rune *u, size_t i)
{
if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
*u = UTF_INVALID;
for (i = 1; *u > utfmax[i]; ++i)
;
return i;
}
static const char base64_digits[] = {
[43] = 62, 0, 0, 0, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
0, 0, 0, -1, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0,
0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
};
char
base64dec_getc(const char **src)
{
while (**src && !isprint(**src))
(*src)++;
return **src ? *((*src)++) : '='; /* emulate padding if string ends */
}
char *
base64dec(const char *src)
{
size_t in_len = strlen(src);
char *result, *dst;
if (in_len % 4)
in_len += 4 - (in_len % 4);
result = dst = xmalloc(in_len / 4 * 3 + 1);
while (*src) {
int a = base64_digits[(unsigned char) base64dec_getc(&src)];
int b = base64_digits[(unsigned char) base64dec_getc(&src)];
int c = base64_digits[(unsigned char) base64dec_getc(&src)];
int d = base64_digits[(unsigned char) base64dec_getc(&src)];
/* invalid input. 'a' can be -1, e.g. if src is "\n" (c-str) */
if (a == -1 || b == -1)
break;
*dst++ = (a << 2) | ((b & 0x30) >> 4);
if (c == -1)
break;
*dst++ = ((b & 0x0f) << 4) | ((c & 0x3c) >> 2);
if (d == -1)
break;
*dst++ = ((c & 0x03) << 6) | d;
}
*dst = '\0';
return result;
}
void
selinit(void)
{
sel.mode = SEL_IDLE;
sel.snap = 0;
sel.ob.x = -1;
}
int
tlinelen(Line line)
{
int i = term.col - 1;
for (; i >= 0 && !(line[i].mode & (ATTR_SET | ATTR_WRAP)); i--);
return i + 1;
}
int
tiswrapped(Line line)
{
int len = tlinelen(line);
return len > 0 && (line[len - 1].mode & ATTR_WRAP);
}
char *
tgetglyphs(char *buf, const Glyph *gp, const Glyph *lgp)
{
while (gp <= lgp)
if (gp->mode & ATTR_WDUMMY) {
gp++;
} else {
buf += utf8encode((gp++)->u, buf);
}
return buf;
}
size_t
tgetline(char *buf, const Glyph *fgp)
{
char *ptr;
const Glyph *lgp = &fgp[term.col - 1];
while (lgp > fgp && !(lgp->state & (ATTR_SET | ATTR_WRAP)))
lgp--;
ptr = tgetglyphs(buf, fgp, lgp);
if (!(lgp->mode & ATTR_WRAP))
*(ptr++) = '\n';
return ptr - buf;
}
void
selstart(int col, int row, int snap)
{
selclear();
sel.mode = SEL_EMPTY;
sel.type = SEL_REGULAR;
sel.alt = IS_SET(MODE_ALTSCREEN);
sel.snap = snap;
sel.oe.x = sel.ob.x = col;
sel.oe.y = sel.ob.y = row;
selnormalize();
if (sel.snap != 0)
sel.mode = SEL_READY;
tsetdirt(sel.nb.y, sel.ne.y);
}
void
selextend(int col, int row, int type, int done)
{
int oldey, oldex, oldsby, oldsey, oldtype;
if (sel.mode == SEL_IDLE)
return;
if (done && sel.mode == SEL_EMPTY) {
selclear();
return;
}
oldey = sel.oe.y;
oldex = sel.oe.x;
oldsby = sel.nb.y;
oldsey = sel.ne.y;
oldtype = sel.type;
sel.oe.x = col;
sel.oe.y = row;
sel.type = type;
selnormalize();
if (oldey != sel.oe.y || oldex != sel.oe.x ||
oldtype != sel.type || sel.mode == SEL_EMPTY) {
tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
}
sel.mode = done ? SEL_IDLE : SEL_READY;
}
void
selnormalize(void)
{
int i;
if (sel.type == SEL_REGULAR && sel.ob.y != sel.oe.y) {
sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
} else {
sel.nb.x = MIN(sel.ob.x, sel.oe.x);
sel.ne.x = MAX(sel.ob.x, sel.oe.x);
}
sel.nb.y = MIN(sel.ob.y, sel.oe.y);
sel.ne.y = MAX(sel.ob.y, sel.oe.y);
selsnap(&sel.nb.x, &sel.nb.y, -1);
selsnap(&sel.ne.x, &sel.ne.y, +1);
/* expand selection over line breaks */
if (sel.type == SEL_RECTANGULAR)
return;
i = tlinelen(TLINE(sel.nb.y));
if (sel.nb.x > i)
sel.nb.x = i;
if (sel.ne.x >= tlinelen(TLINE(sel.ne.y)))
sel.ne.x = term.col - 1;
}
int
regionselected(int x1, int y1, int x2, int y2)
{
if (sel.ob.x == -1 || sel.mode == SEL_EMPTY ||
sel.alt != IS_SET(MODE_ALTSCREEN) || sel.nb.y > y2 || sel.ne.y < y1)
return 0;
return (sel.type == SEL_RECTANGULAR) ? sel.nb.x <= x2 && sel.ne.x >= x1
: (sel.nb.y != y2 || sel.nb.x <= x2) &&
(sel.ne.y != y1 || sel.ne.x >= x1);
}
int
selected(int x, int y)
{
return regionselected(x, y, x, y);
}
void
selsnap(int *x, int *y, int direction)
{
int newx, newy, xt, yt;
int rtop = 0, rbot = term.row - 1;
int delim, prevdelim;
const Glyph *gp, *prevgp;
if (!IS_SET(MODE_ALTSCREEN))
rtop += -term.histf + term.scr, rbot += term.scr;
switch (sel.snap) {
case SNAP_WORD:
/*
* Snap around if the word wraps around at the end or
* beginning of a line.
*/
prevgp = &TLINE(*y)[*x];
prevdelim = ISDELIM(prevgp->u);
for (;;) {
newx = *x + direction;
newy = *y;
if (!BETWEEN(newx, 0, term.col - 1)) {
newy += direction;
newx = (newx + term.col) % term.col;
if (!BETWEEN(newy, rtop, rbot))
break;
if (direction > 0)
yt = *y, xt = *x;
else
yt = newy, xt = newx;
if (!(TLINE(yt)[xt].mode & ATTR_WRAP))
break;
}
if (newx >= tlinelen(TLINE(newy)))
break;
gp = &TLINE(newy)[newx];
delim = ISDELIM(gp->u);
if (!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim ||
(delim && !(gp->u == ' ' && prevgp->u == ' '))))
break;
*x = newx;
*y = newy;
prevgp = gp;
prevdelim = delim;
}
break;
case SNAP_LINE:
/*
* Snap around if the the previous line or the current one
* has set ATTR_WRAP at its end. Then the whole next or
* previous line will be selected.
*/
*x = (direction < 0) ? 0 : term.col - 1;
if (direction < 0) {
for (; *y > rtop; *y -= 1) {
if (!tiswrapped(TLINE(*y-1)))
break;
}
} else if (direction > 0) {
for (; *y < rbot; *y += 1) {
if (!tiswrapped(TLINE(*y)))
break;
}
}
break;
}
}
char *
getsel(void)
{
char *str, *ptr;
int y, lastx, linelen;
const Glyph *gp, *lgp;
if (sel.ob.x == -1 || sel.alt != IS_SET(MODE_ALTSCREEN))
return NULL;
str = xmalloc((term.col + 1) * (sel.ne.y - sel.nb.y + 1) * UTF_SIZ);
ptr = str;
/* append every set & selected glyph to the selection */
for (y = sel.nb.y; y <= sel.ne.y; y++) {
Line line = TLINE(y);
if ((linelen = tlinelen(line)) == 0) {
*ptr++ = '\n';
continue;
}
if (sel.type == SEL_RECTANGULAR) {
gp = &line[sel.nb.x];
lastx = sel.ne.x;
} else {
gp = &line[sel.nb.y == y ? sel.nb.x : 0];
lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
}
lgp = &line[MIN(lastx, linelen-1)];
ptr = tgetglyphs(ptr, gp, lgp);
/*
* Copy and pasting of line endings is inconsistent
* in the inconsistent terminal and GUI world.
* The best solution seems like to produce '\n' when
* something is copied from st and convert '\n' to
* '\r', when something to be pasted is received by
* st.
* FIXME: Fix the computer world.
*/
if ((y < sel.ne.y || lastx >= linelen) &&
(!(lgp->mode & ATTR_WRAP) || sel.type == SEL_RECTANGULAR))
*ptr++ = '\n';
}
*ptr = '\0';
return str;
}
void
selclear(void)
{
if (sel.ob.x == -1)
return;
selremove();
tsetdirt(sel.nb.y, sel.ne.y);
}
void
selremove(void)
{
sel.mode = SEL_IDLE;
sel.ob.x = -1;
}
void
die(const char *errstr, ...)
{
va_list ap;
va_start(ap, errstr);
vfprintf(stderr, errstr, ap);
va_end(ap);
exit(1);
}
void
execsh(char *cmd, char **args)
{
char *sh, *prog, *arg;
const struct passwd *pw;
errno = 0;
if ((pw = getpwuid(getuid())) == NULL) {
if (errno)
die("getpwuid: %s\n", strerror(errno));
else
die("who are you?\n");
}
if ((sh = getenv("SHELL")) == NULL)
sh = (pw->pw_shell[0]) ? pw->pw_shell : cmd;
if (args) {
prog = args[0];
arg = NULL;
} else if (scroll) {
prog = scroll;
arg = utmp ? utmp : sh;
} else if (utmp) {
prog = utmp;
arg = NULL;
} else {
prog = sh;
arg = NULL;
}
DEFAULT(args, ((char *[]) {prog, arg, NULL}));
unsetenv("COLUMNS");
unsetenv("LINES");
unsetenv("TERMCAP");
setenv("LOGNAME", pw->pw_name, 1);
setenv("USER", pw->pw_name, 1);
setenv("SHELL", sh, 1);
setenv("HOME", pw->pw_dir, 1);
setenv("TERM", termname, 1);
signal(SIGCHLD, SIG_DFL);
signal(SIGHUP, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGALRM, SIG_DFL);
execvp(prog, args);
_exit(1);
}
void
sigchld(int a)
{
int stat;
pid_t p;
if ((p = waitpid(pid, &stat, WNOHANG)) < 0)
die("waiting for pid %hd failed: %s\n", pid, strerror(errno));
if (pid != p)
return;
if (WIFEXITED(stat) && WEXITSTATUS(stat))
die("child exited with status %d\n", WEXITSTATUS(stat));
else if (WIFSIGNALED(stat))
die("child terminated due to signal %d\n", WTERMSIG(stat));
_exit(0);
}
void
stty(char **args)
{
char cmd[_POSIX_ARG_MAX], **p, *q, *s;
size_t n, siz;
if ((n = strlen(stty_args)) > sizeof(cmd)-1)
die("incorrect stty parameters\n");
memcpy(cmd, stty_args, n);
q = cmd + n;
siz = sizeof(cmd) - n;
for (p = args; p && (s = *p); ++p) {
if ((n = strlen(s)) > siz-1)
die("stty parameter length too long\n");
*q++ = ' ';
memcpy(q, s, n);
q += n;
siz -= n + 1;
}
*q = '\0';
if (system(cmd) != 0)
perror("Couldn't call stty");
}
int
ttynew(char *line, char *cmd, char *out, char **args)
{
int m, s;
if (out) {
term.mode |= MODE_PRINT;
iofd = (!strcmp(out, "-")) ?
1 : open(out, O_WRONLY | O_CREAT, 0666);
if (iofd < 0) {
fprintf(stderr, "Error opening %s:%s\n",
out, strerror(errno));
}
}
if (line) {
if ((cmdfd = open(line, O_RDWR)) < 0)
die("open line '%s' failed: %s\n",
line, strerror(errno));
dup2(cmdfd, 0);
stty(args);
return cmdfd;
}
/* seems to work fine on linux, openbsd and freebsd */
if (openpty(&m, &s, NULL, NULL, NULL) < 0)
die("openpty failed: %s\n", strerror(errno));
switch (pid = fork()) {
case -1:
die("fork failed: %s\n", strerror(errno));
break;
case 0:
close(iofd);
setsid(); /* create a new process group */
dup2(s, 0);
dup2(s, 1);
dup2(s, 2);
if (ioctl(s, TIOCSCTTY, NULL) < 0)
die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
close(s);
close(m);
#ifdef __OpenBSD__
if ( pledge("stdio getpw proc exec", NULL) == -1)
die("pledge\n");
#endif
execsh(cmd, args);
break;
default:
#ifdef __OpenBSD__
if (pledge("stdio rpath tty proc ps exec", NULL) == -1)
die("pledge\n");
#endif
close(s);
cmdfd = m;
signal(SIGCHLD, sigchld);
break;
}
return cmdfd;
}
size_t
ttyread(void)
{
static char buf[BUFSIZ];
static int buflen = 0;
int ret, written;
/* append read bytes to unprocessed bytes */
ret = read(cmdfd, buf+buflen, LEN(buf)-buflen);
switch (ret) {
case 0:
exit(0);
case -1:
die("couldn't read from shell: %s\n", strerror(errno));
default:
buflen += ret;
written = twrite(buf, buflen, 0);
buflen -= written;
/* keep any incomplete UTF-8 byte sequence for the next call */
if (buflen > 0)
memmove(buf, buf + written, buflen);
return ret;
}
}
void
ttywrite(const char *s, size_t n, int may_echo)
{
const char *next;
kscrolldown(&((Arg){ .i = term.scr }));
if (may_echo && IS_SET(MODE_ECHO))
twrite(s, n, 1);
if (!IS_SET(MODE_CRLF)) {
ttywriteraw(s, n);
return;
}
/* This is similar to how the kernel handles ONLCR for ttys */
while (n > 0) {
if (*s == '\r') {
next = s + 1;
ttywriteraw("\r\n", 2);
} else {
next = memchr(s, '\r', n);
DEFAULT(next, s + n);
ttywriteraw(s, next - s);
}
n -= next - s;
s = next;
}
}
void
ttywriteraw(const char *s, size_t n)
{
fd_set wfd, rfd;
ssize_t r;
size_t lim = 256;
/*
* Remember that we are using a pty, which might be a modem line.
* Writing too much will clog the line. That's why we are doing this
* dance.
* FIXME: Migrate the world to Plan 9.
*/
while (n > 0) {
FD_ZERO(&wfd);
FD_ZERO(&rfd);
FD_SET(cmdfd, &wfd);
FD_SET(cmdfd, &rfd);
/* Check if we can write. */
if (pselect(cmdfd+1, &rfd, &wfd, NULL, NULL, NULL) < 0) {
if (errno == EINTR)
continue;
die("select failed: %s\n", strerror(errno));
}
if (FD_ISSET(cmdfd, &wfd)) {
/*
* Only write the bytes written by ttywrite() or the