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/* See LICENSE file for copyright and license details. */
#include <sys/types.h>
#include <sys/wait.h>
#include <ctype.h>
#include <err.h>
#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))
static void buffer(char c);
static void cmd(const char *cmdstr, ...);
static int getch();
void getpty(void);
static void movea(int x, int y);
static void mover(int x, int y);
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(int c);
typedef struct {
unsigned char data[BUFSIZ];
int s, e;
int n;
} RingBuffer;
typedef struct {
unsigned char data[BUFSIZ];
int i, n;
} ReadBuffer;
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 rbuf;
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() {
if(rbuf.i++ >= rbuf.n) {
rbuf.n = read(ptm, rbuf.data, LENGTH(rbuf.data));
if(rbuf.n == -1)
err(EXIT_FAILURE, "cannot read from slave pty");
rbuf.i = 0;
}
return rbuf.data[rbuf.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
parseesc(void) {
int i, j;
int arg[16];
memset(arg, 0, LENGTH(arg));
c = getch();
switch(c) {
case '[':
c = getch();
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();
}
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(c);
}
}
void
scroll(int l) {
cmd("seek(%d,%d)", cx, cy + l);
}
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(int c) {
if(rbuf.i + 1 >= rbuf.n)
errx(EXIT_FAILURE, "read buffer full");
rbuf.data[rbuf.i++] = c;
}
int
main(int argc, char *argv[]) {
fd_set rfds;
if(argc == 2 && !strcmp("-v", argv[1])) {
fprintf(stderr, "std-"VERSION", © 2008 Matthias-Christian Ott\n");
exit(EXIT_SUCCESS);
}
else if(argc == 1) {
fprintf(stderr, "usage: st [-v]\n");
exit(EXIT_FAILURE);
}
getpty();
shell();
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(ptm, &rfds)) {
do {
c = getch();
switch(c) {
case '\033':
parseesc();
break;
default:
putchar(c);
}
} while(rbuf.i < rbuf.n);
fflush(stdout);
}
}
return 0;
}
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