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