Cygwin port of the Unix 'script' utility.

Fri Sep 27 13:29:00 GMT 2002

Hello,
After failing to find a cygwin version of the unix script utility I
decided to port it myself.
This was a very quick port so there could be bugs and it could be better
but it seems to work OK
for my requirements.
To compile the code I used: gcc -o script script.c -lutil
Hope this helps someone
cheers
AlanE
Here is the code if anyone is interested:
=========================================================
/*
 * Copyright (c) 1980, 1992, 1993
 * The Regents of the University of California. All rights
reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in
the
 * documentation and/or other materials provided with the
distribution.
 * 3. All advertising materials mentioning features or use of this
software
 * must display the following acknowledgement:
 * This product includes software developed by the University of
 * California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its
contributors
 * may be used to endorse or promote products derived from this
software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS''
AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
OF
 * SUCH DAMAGE.
 */
#include <sys/cdefs.h>
/* __FBSDID("$FreeBSD: src/usr.bin/script/script.c,v 1.20 2002年09月04日
23:29:06 dwmalone Exp $"); */
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1980, 1992, 1993\n\
 The Regents of the University of California. All rights
reserved.\n";
#endif
#ifndef lint
static const char sccsid[] = "@(#)script.c 8.1 (Berkeley) 6/6/93";
#endif
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/time.h>
/* #include "../include/err.h" */
#include <errno.h>
#include <fcntl.h>
#include "../libutil/libutil.h"
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <sys/unistd.h>
#include <pwd.h>
FILE *fscript;
int master, slave;
int child;
const char *fname;
int qflg;
struct termios tt;
void done(int);
void dooutput(void);
void doshell(char **);
void fail(void);
void finish(void);
static void usage(void);
void cfmakeraw(struct termios *);
extern char *optarg;
extern int optind, opterr;
int
main(int argc, char *argv[])
{
 int cc;
 struct termios rtt, stt;
 struct winsize win;
 int aflg, kflg, ch, n;
 struct timeval tv, *tvp;
 time_t tvec, start;
 char obuf[BUFSIZ];
 char ibuf[BUFSIZ];
 fd_set rfd;
 int flushtime = 2;
 int one=1;
 aflg = kflg = 0;
 while ((ch = getopt(argc, argv, "aqkt:")) != -1)
 switch(ch) {
 case 'a':
 aflg = 1;
 break;
 case 'q':
 qflg = 1;
 break;
 case 'k':
 kflg = 1;
 break;
 case 't':
 flushtime = atoi(optarg);
 if (flushtime < 0)
 fprintf(stderr, "invalid flush time %d",
flushtime);
 break;
 case '?':
 default:
 usage();
 }
 argc -= optind;
 argv += optind;
 if (argc > 0) {
 fname = argv[0];
 argv++;
 argc--;
 } else
 fname = "typescript";
 if ((fscript = fopen(fname, aflg ? "a" : "w")) == NULL)
 fprintf(stderr, "%s", fname);
 (void)tcgetattr(STDIN_FILENO, &tt);
 (void)ioctl(STDIN_FILENO, TIOCGWINSZ, &win);
 if (openpty(&master, &slave, NULL, &tt, &win) == -1)
 fprintf(stderr, "openpty");
 if (!qflg) {
 tvec = time(NULL);
 (void)printf("Script started, output file is %s\n",
fname);
 (void)fprintf(fscript, "Script started on %s",
ctime(&tvec));
 fflush(fscript);
 }
 rtt = tt;
 cfmakeraw(&rtt);
 rtt.c_lflag &= ~ECHO;
 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &rtt);
 child = fork();
 if (child < 0) {
 printf("fork");
 done(1);
 }
 if (child == 0)
 doshell(argv);
 (void)close(slave);
 if (flushtime > 0)
 tvp = &tv;
 else
 tvp = NULL;
 start = time(0);
 FD_ZERO(&rfd);
 ioctl(master, FIONBIO, (char *)&one);
 for (;;) {
 FD_SET(master, &rfd);
 FD_SET(STDIN_FILENO, &rfd);
 if (flushtime > 0) {
 tv.tv_sec = flushtime;
 tv.tv_usec = 0;
 }
 n = select(master + 1, &rfd, 0, 0, tvp);
 if (kill(child, 0) < 0) {
 if (errno == ESRCH)
 break;
 else
 fprintf(stderr, "Problem with child\n");
 }
 if (n < 0 && errno != EINTR)
 break;
 if (FD_ISSET(STDIN_FILENO, &rfd)) {
 cc = read(STDIN_FILENO, ibuf, BUFSIZ);
 if (cc <= 0)
 break;
 if (cc > 0) {
 (void)write(master, ibuf, cc);
 if (kflg && tcgetattr(master, &stt) >= 0
&&
 ((stt.c_lflag & ECHO) == 0)) {
 (void)fwrite(ibuf, 1, cc,
fscript);
 }
 }
 }
 if (FD_ISSET(master, &rfd)) {
 cc = read(master, obuf, sizeof (obuf));
 if (cc <= 0)
 break;
 (void)write(STDOUT_FILENO, obuf, cc);
 (void)fwrite(obuf, 1, cc, fscript);
 }
 tvec = time(0);
 if (tvec - start >= flushtime) {
 fflush(fscript);
 start = tvec;
 }
 }
 finish();
 done(0);
}
static void
usage(void)
{
 (void)fprintf(stderr,
 "usage: script [-a] [-q] [-k] [-t time] [file]
[command]\n");
 exit(1);
}
void
finish(void)
{
 pid_t pid;
 int die, e, status;
 die = e = 0;
 while ((pid = wait3(&status, WNOHANG, 0)) > 0)
 if (pid == child) {
 die = 1;
 if (WIFEXITED(status))
 e = WEXITSTATUS(status);
 else if (WIFSIGNALED(status))
 e = WTERMSIG(status);
 else /* can't happen */
 e = 1;
 }
 if (die)
 done(e);
}
void
doshell(char **av)
{
 const char *shell;
 char *userenv;
 char *pathenv;
 struct passwd *pwd;
 int pathlen;
 userenv = getenv("USER");
 pwd = getpwnam(userenv);
 if (pwd == NULL) {
 fprintf(stderr, "Invalid user %s", userenv);
 }
 setenv ("SHELL", pwd->pw_shell, 1);
 setenv ("USER", pwd->pw_name, 1);
 setenv ("TERM", "cygwin", 0);
 endpwent();
 shell = getenv("SHELL");
 if (shell == NULL)
 shell = _PATH_BSHELL;
 (void)close(master);
 (void)fclose(fscript);
 login_tty(slave);
 if (av[0]) {
 execvp(av[0], av);
 printf("%s", av[0]);
 } else {
 execl(shell, shell, "-i", (char *)NULL);
 printf("%s", shell);
 }
 fail();
}
void
fail(void)
{
 (void)kill(0, SIGTERM);
 done(1);
}
void
done(int eno)
{
 time_t tvec;
 (void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &tt);
 tvec = time(NULL);
 if (!qflg) {
 (void)fprintf(fscript,"\nScript done on %s",
ctime(&tvec));
 (void)printf("\nScript done, output file is %s\n",
fname);
 }
 (void)fclose(fscript);
 (void)close(master);
 exit(eno);
}
void cfmakeraw(struct termios *termios_p) {
 termios_p->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
|INLCR|IGNCR|ICRNL|IXON);
 termios_p->c_oflag &= ~OPOST;
 termios_p->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
 termios_p->c_cflag &= ~(CSIZE|PARENB);
 termios_p->c_cflag |= CS8;
}
=================================================================
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