-#include <sys/ioctl.h>
-#include <sys/select.h>
-#include <sys/stat.h>
+/* 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 language. 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 <errno.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>
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
-void buffer(char c);
-void cmd(const char *cmdstr, ...);
-void *emallocz(unsigned int size);
-void eprint(const char *errstr, ...);
-void eprintn(const char *errstr, ...);
-void getpty(void);
-void movea(int x, int y);
-void mover(int x, int y);
-void parse(void);
-void scroll(int l);
-void shell(void);
-void sigchld(int n);
-char unbuffer(void);
-
-enum { QuestionMark = 1, Digit = 2 };
-
typedef struct {
unsigned char data[BUFSIZ];
int s, e;
int n;
} RingBuffer;
-int cols = 80, lines = 25;
-int cx = 0, cy = 0;
-int c, s;
-FILE *fptm = NULL;
-int ptm, pts;
-_Bool bold;
-pid_t pid;
-RingBuffer buf;
+static void buffer(char c);
+static void cmd(const char *cmdstr, ...);
+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 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 FILE *fptm;
void
buffer(char c) {
va_end(ap);
}
-void *
-emallocz(unsigned int size) {
- void *res = calloc(1, size);
-
- if(!res)
- eprint("fatal: could not malloc() %u bytes\n", size);
- return res;
-}
-
-void
-eprint(const char *errstr, ...) {
- va_list ap;
-
- va_start(ap, errstr);
- vfprintf(stderr, errstr, ap);
- va_end(ap);
- exit(EXIT_FAILURE);
-}
-
-void
-eprintn(const char *errstr, ...) {
- va_list ap;
-
- va_start(ap, errstr);
- vfprintf(stderr, errstr, ap);
- va_end(ap);
- fprintf(stderr, ": %s\n", strerror(errno));
- exit(EXIT_FAILURE);
-}
-
-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)
- eprintn("error, cannot open pty");
-#endif
-#if defined(_XOPEN_SOURCE)
- if(ptm != -1) {
- if(grantpt(ptm) == -1)
- eprintn("error, cannot grant access to pty");
- if(unlockpt(ptm) == -1)
- eprintn("error, cannot unlock pty");
- ptsdev = ptsname(ptm);
- if(!ptsdev)
- eprintn("error, slave pty name undefined");
- pts = open(ptsdev, O_RDWR);
- if(pts == -1)
- eprintn("error, cannot open slave pty");
- }
- else
- eprintn("error, cannot open pty");
-#endif
-}
-
void
movea(int x, int y) {
x = MAX(x, cols);
y = MAX(y, lines);
cx = x;
cy = y;
- cmd("s %d,%d", x, y);
+ cmd("seek(%d,%d)", x, y);
}
void
}
void
+parsecmd(void) {
+}
+
+void
parseesc(void) {
int i, j;
int arg[16];
memset(arg, 0, LENGTH(arg));
- s = 0;
c = getc(fptm);
switch(c) {
case '[':
c = getc(fptm);
for(j = 0; j < LENGTH(arg);) {
if(isdigit(c)) {
- s |= Digit;
+ digit = 1;
arg[j] *= 10;
arg[j] += c - '0';
}
else if(c == '?')
- s |= QuestionMark;
+ qmark = 1;
else if(c == ';') {
- if(!(s & Digit))
- eprint("syntax error");
- s &= ~Digit;
+ if(!digit)
+ errx(EXIT_FAILURE, "syntax error");
+ digit = 0;
j++;
}
else {
- if(s & Digit) {
- s &= ~Digit;
+ if(digit) {
+ digit = 0;
j++;
}
break;
case 0:
case 22:
if(bold)
- cmd("b");
+ cmd("bold");
case 1:
if(!bold)
- cmd("b");
+ cmd("bold");
break;
}
}
void
scroll(int l) {
- cmd("s %d, %d", cx, cy + 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
pid = fork();
switch(pid) {
case -1:
- eprint("error, cannot fork\n");
+ err(EXIT_FAILURE, "cannot fork");
case 0:
setsid();
dup2(pts, STDIN_FILENO);
int ret;
if(waitpid(pid, &ret, 0) == -1)
- eprintn("error, waiting for child failed");
+ err(EXIT_FAILURE, "waiting for child failed");
if(WIFEXITED(ret))
exit(WEXITSTATUS(ret));
else
int
main(int argc, char *argv[]) {
- fd_set rd;
+ fd_set rfds;
+
if(argc == 2 && !strcmp("-v", argv[1]))
- eprint("std-"VERSION", © 2008 Matthias-Christian Ott\n");
+ errx(EXIT_SUCCESS, "std-"VERSION", © 2008 Matthias-Christian Ott");
else if(argc == 1)
- eprint("usage: st [-v]\n");
+ errx(EXIT_FAILURE, "usage: std [-v]");
getpty();
shell();
+ FD_ZERO(&rfds);
+ FD_SET(STDIN_FILENO, &rfds);
+ FD_SET(ptm, &rfds);
+ if(!(fptm = fdopen(ptm, "r+")))
+ err(EXIT_FAILURE, "cannot open pty");
+ if(fcntl(ptm, F_SETFL, O_NONBLOCK) == -1)
+ err(EXIT_FAILURE, "cannot set pty to non-blocking mode");
+ if(fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK) == -1)
+ err(EXIT_FAILURE, "cannot set stdin to non-blocking mode");
+ for(;;) {
+ if(select(MAX(ptm, STDIN_FILENO) + 1, &rfds, NULL, NULL, NULL) == -1)
+ err(EXIT_FAILURE, "cannot select");
+ if(FD_ISSET(ptm, &rfds)) {
+ for(;;) {
+ if((c = getc(fptm)) == EOF) {
+ if(feof(fptm)) {
+ FD_CLR(ptm, &rfds);
+ fflush(fptm);
+ break;
+ }
+ if(errno != EAGAIN)
+ err(EXIT_FAILURE, "cannot read from pty");
+ fflush(stdout);
+ break;
+ }
+ switch(c) {
+ case '\033':
+ parseesc();
+ break;
+ default:
+ putchar(c);
+ }
+ }
+ fflush(stdout);
+ }
+ if(FD_ISSET(STDIN_FILENO, &rfds)) {
+ for(;;) {
+ if((c = getchar()) == EOF) {
+ if(feof(stdin)) {
+ FD_CLR(STDIN_FILENO, &rfds);
+ fflush(fptm);
+ break;
+ }
+ if(errno != EAGAIN)
+ err(EXIT_FAILURE, "cannot read from stdin");
+ fflush(fptm);
+ break;
+ }
+ switch(c) {
+ case ':':
+ parsecmd();
+ break;
+ default:
+ putc(c, fptm);
+ }
+ }
+ fflush(fptm);
+ }
+ }
return 0;
}
Got questions, comments, patches, etc.? Contact Jason Woofenden