mirror of
https://github.com/LukeSmithxyz/st.git
synced 2024-11-22 15:25:58 +01:00
362 lines
6.7 KiB
C
362 lines
6.7 KiB
C
/* See LICENSE file for copyright and license details.
|
|
*
|
|
* Simple terminal daemon is a terminal emulator. It can be used in
|
|
* combination with simple terminal to emulate a mostly VT100-compatible
|
|
* terminal.
|
|
*
|
|
* In this process std works like a filter. It reads data from a
|
|
* pseudo-terminal and parses the escape sequences and transforms
|
|
* them into an ed(1)-like. The resulting data is buffered and written
|
|
* to stdout.
|
|
* Parallely it reads data from stdin and parses and executes the
|
|
* commands. The resulting data is written to the pseudo-terminal.
|
|
*/
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
#include <ctype.h>
|
|
#include <err.h>
|
|
#include <fcntl.h>
|
|
#if !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
|
|
#include <pty.h>
|
|
#endif
|
|
#include <signal.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#define LENGTH(x) (sizeof(x) / sizeof((x)[0]))
|
|
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
|
|
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
|
|
|
|
typedef struct {
|
|
unsigned char data[BUFSIZ];
|
|
int s, e;
|
|
int n;
|
|
} RingBuffer;
|
|
|
|
typedef struct {
|
|
unsigned char data[BUFSIZ];
|
|
int i, n;
|
|
int fd;
|
|
} ReadBuffer;
|
|
|
|
static void buffer(char c);
|
|
static void cmd(const char *cmdstr, ...);
|
|
static int getch(ReadBuffer *buf);
|
|
static void getpty(void);
|
|
static void movea(int x, int y);
|
|
static void mover(int x, int y);
|
|
static void parsecmd(void);
|
|
static void parseesc(void);
|
|
static void scroll(int l);
|
|
static void shell(void);
|
|
static void sigchld(int n);
|
|
static char unbuffer(void);
|
|
static void ungetch(ReadBuffer *buf, int c);
|
|
|
|
static int cols = 80, lines = 25;
|
|
static int cx = 0, cy = 0;
|
|
static int c;
|
|
static int ptm, pts;
|
|
static _Bool bold, digit, qmark;
|
|
static pid_t pid;
|
|
static RingBuffer buf;
|
|
static ReadBuffer cmdbuf, ptmbuf;
|
|
|
|
void
|
|
buffer(char c) {
|
|
if(buf.n < LENGTH(buf.data))
|
|
buf.n++;
|
|
else
|
|
buf.s = (buf.s + 1) % LENGTH(buf.data);
|
|
buf.data[buf.e++] = c;
|
|
buf.e %= LENGTH(buf.data);
|
|
}
|
|
|
|
void
|
|
cmd(const char *cmdstr, ...) {
|
|
va_list ap;
|
|
|
|
putchar('\n');
|
|
putchar(':');
|
|
va_start(ap, cmdstr);
|
|
vfprintf(stdout, cmdstr, ap);
|
|
va_end(ap);
|
|
}
|
|
|
|
int
|
|
getch(ReadBuffer *buf) {
|
|
if(buf->i++ >= buf->n) {
|
|
buf->n = read(buf->fd, buf->data, BUFSIZ);
|
|
if(buf->n == -1)
|
|
err(EXIT_FAILURE, "cannot read");
|
|
buf->i = 0;
|
|
}
|
|
return buf->data[buf->i];
|
|
}
|
|
|
|
void
|
|
movea(int x, int y) {
|
|
x = MAX(x, cols);
|
|
y = MAX(y, lines);
|
|
cx = x;
|
|
cy = y;
|
|
cmd("seek(%d,%d)", x, y);
|
|
}
|
|
|
|
void
|
|
mover(int x, int y) {
|
|
movea(cx + x, cy + y);
|
|
}
|
|
|
|
void
|
|
parsecmd(void) {
|
|
}
|
|
|
|
void
|
|
parseesc(void) {
|
|
int i, j;
|
|
int arg[16];
|
|
|
|
memset(arg, 0, LENGTH(arg));
|
|
c = getch(&ptmbuf);
|
|
switch(c) {
|
|
case '[':
|
|
c = getch(&ptmbuf);
|
|
for(j = 0; j < LENGTH(arg);) {
|
|
if(isdigit(c)) {
|
|
digit = 1;
|
|
arg[j] *= 10;
|
|
arg[j] += c - '0';
|
|
}
|
|
else if(c == '?')
|
|
qmark = 1;
|
|
else if(c == ';') {
|
|
if(!digit)
|
|
errx(EXIT_FAILURE, "syntax error");
|
|
digit = 0;
|
|
j++;
|
|
}
|
|
else {
|
|
if(digit) {
|
|
digit = 0;
|
|
j++;
|
|
}
|
|
break;
|
|
}
|
|
c = getch(&ptmbuf);
|
|
}
|
|
switch(c) {
|
|
case '@':
|
|
break;
|
|
case 'A':
|
|
mover(0, j ? arg[0] : 1);
|
|
break;
|
|
case 'B':
|
|
mover(0, j ? -arg[0] : -1);
|
|
break;
|
|
case 'C':
|
|
mover(j ? arg[0] : 1, 0);
|
|
break;
|
|
case 'D':
|
|
mover(j ? -arg[0] : -1, 0);
|
|
break;
|
|
case 'E':
|
|
/* movel(j ? arg[0] : 1); */
|
|
break;
|
|
case 'F':
|
|
/* movel(j ? -arg[0] : -1); */
|
|
break;
|
|
case '`':
|
|
case 'G':
|
|
movea(j ? arg[0] : 1, cy);
|
|
break;
|
|
case 'f':
|
|
case 'H':
|
|
movea(arg[1] ? arg[1] : 1, arg[0] ? arg[0] : 1);
|
|
case 'L':
|
|
/* insline(j ? arg[0] : 1); */
|
|
break;
|
|
case 'M':
|
|
/* delline(j ? arg[0] : 1); */
|
|
break;
|
|
case 'P':
|
|
break;
|
|
case 'S':
|
|
scroll(j ? arg[0] : 1);
|
|
break;
|
|
case 'T':
|
|
scroll(j ? -arg[0] : -1);
|
|
break;
|
|
case 'd':
|
|
movea(cx, j ? arg[0] : 1);
|
|
break;
|
|
case 'm':
|
|
for(i = 0; i < j; i++) {
|
|
if(arg[i] >= 30 && arg[i] <= 37)
|
|
cmd("#%d", arg[i] - 30);
|
|
if(arg[i] >= 40 && arg[i] <= 47)
|
|
cmd("|%d", arg[i] - 40);
|
|
/* xterm bright colors */
|
|
if(arg[i] >= 90 && arg[i] <= 97)
|
|
cmd("#%d", arg[i] - 90);
|
|
if(arg[i] >= 100 && arg[i] <= 107)
|
|
cmd("|%d", arg[i] - 100);
|
|
switch(arg[i]) {
|
|
case 0:
|
|
case 22:
|
|
if(bold)
|
|
cmd("bold");
|
|
case 1:
|
|
if(!bold)
|
|
cmd("bold");
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
putchar('\033');
|
|
ungetch(&ptmbuf, c);
|
|
}
|
|
}
|
|
|
|
void
|
|
scroll(int l) {
|
|
cmd("seek(%d,%d)", cx, cy + l);
|
|
}
|
|
|
|
void
|
|
getpty(void) {
|
|
char *ptsdev;
|
|
|
|
#if defined(_GNU_SOURCE)
|
|
ptm = getpt();
|
|
#elif _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600
|
|
ptm = posix_openpt(O_RDWR);
|
|
#else
|
|
ptm = open("/dev/ptmx", O_RDWR);
|
|
if(ptm == -1)
|
|
if(openpty(&ptm, &pts, NULL, NULL, NULL) == -1)
|
|
err(EXIT_FAILURE, "cannot open pty");
|
|
#endif
|
|
#if defined(_XOPEN_SOURCE)
|
|
if(ptm != -1) {
|
|
if(grantpt(ptm) == -1)
|
|
err(EXIT_FAILURE, "cannot grant access to pty");
|
|
if(unlockpt(ptm) == -1)
|
|
err(EXIT_FAILURE, "cannot unlock pty");
|
|
ptsdev = ptsname(ptm);
|
|
if(!ptsdev)
|
|
err(EXIT_FAILURE, "slave pty name undefined");
|
|
pts = open(ptsdev, O_RDWR);
|
|
if(pts == -1)
|
|
err(EXIT_FAILURE, "cannot open slave pty");
|
|
}
|
|
else
|
|
err(EXIT_FAILURE, "cannot open pty");
|
|
#endif
|
|
}
|
|
|
|
void
|
|
shell(void) {
|
|
static char *shell = NULL;
|
|
|
|
if(!shell && !(shell = getenv("SHELL")))
|
|
shell = "/bin/sh";
|
|
pid = fork();
|
|
switch(pid) {
|
|
case -1:
|
|
err(EXIT_FAILURE, "cannot fork");
|
|
case 0:
|
|
setsid();
|
|
dup2(pts, STDIN_FILENO);
|
|
dup2(pts, STDOUT_FILENO);
|
|
dup2(pts, STDERR_FILENO);
|
|
close(ptm);
|
|
putenv("TERM=vt102");
|
|
execvp(shell, NULL);
|
|
break;
|
|
default:
|
|
close(pts);
|
|
signal(SIGCHLD, sigchld);
|
|
}
|
|
}
|
|
|
|
void
|
|
sigchld(int n) {
|
|
int ret;
|
|
|
|
if(waitpid(pid, &ret, 0) == -1)
|
|
err(EXIT_FAILURE, "waiting for child failed");
|
|
if(WIFEXITED(ret))
|
|
exit(WEXITSTATUS(ret));
|
|
else
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
char
|
|
unbuffer(void) {
|
|
char c;
|
|
|
|
c = buf.data[buf.s++];
|
|
buf.s %= LENGTH(buf.data);
|
|
buf.n--;
|
|
return c;
|
|
}
|
|
|
|
void
|
|
ungetch(ReadBuffer *buf, int c) {
|
|
if(buf->i + 1 >= buf->n)
|
|
errx(EXIT_FAILURE, "buffer full");
|
|
buf->data[buf->i++] = c;
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[]) {
|
|
fd_set rfds;
|
|
|
|
if(argc == 2 && !strcmp("-v", argv[1]))
|
|
errx(EXIT_SUCCESS, "std-"VERSION", © 2008 Matthias-Christian Ott");
|
|
else if(argc == 1)
|
|
errx(EXIT_FAILURE, "usage: std [-v]");
|
|
getpty();
|
|
shell();
|
|
cmdbuf.fd = STDIN_FILENO;
|
|
ptmbuf.fd = ptm;
|
|
FD_ZERO(&rfds);
|
|
FD_SET(STDIN_FILENO, &rfds);
|
|
FD_SET(ptm, &rfds);
|
|
for(;;) {
|
|
if(select(ptm + 1, &rfds, NULL, NULL, NULL) == -1)
|
|
err(EXIT_FAILURE, "cannot select");
|
|
if(FD_ISSET(STDIN_FILENO, &rfds))
|
|
do {
|
|
c = getch(&cmdbuf);
|
|
switch(c) {
|
|
case ':':
|
|
parsecmd();
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
} while(cmdbuf.i < cmdbuf.n);
|
|
if(FD_ISSET(ptm, &rfds)) {
|
|
do {
|
|
c = getch(&ptmbuf);
|
|
switch(c) {
|
|
case '\033':
|
|
parseesc();
|
|
break;
|
|
default:
|
|
putchar(c);
|
|
}
|
|
} while(ptmbuf.i < ptmbuf.n);
|
|
fflush(stdout);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|