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NetBSD/usr.bin/vi/ex/ex_script.c
lukem 8125c19da2 appease gcc -Wuninitialized. 
Each is marked with XXXGCC, because in some cases it looks like gcc
isn't correctly detecting that
	for ( ; xxx ; yyy)
		foo = 0;
always sets foo ...
2005-06-02 04:25:16 +00:00

808 lines
16 KiB
C
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/* $NetBSD: ex_script.c,v 1.11 2005/06/02 04:25:16 lukem Exp $ */
/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Brian Hirt.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#include <sys/cdefs.h>
#ifndef lint
#if 0
static const char sccsid[] = "@(#)ex_script.c 10.30 (Berkeley) 9/24/96";
#else
__RCSID("$NetBSD: ex_script.c,v 1.11 2005/06/02 04:25:16 lukem Exp $");
#endif
#endif /* not lint */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <sys/stat.h>
#ifdef HAVE_SYS5_PTY
#include <sys/stropts.h>
#endif
#include <sys/time.h>
#include <sys/wait.h>
#include <bitstring.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h> /* XXX: OSF/1 bug: include before <grp.h> */
#include <grp.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "../common/common.h"
#include "../vi/vi.h"
#include "script.h"
#include "pathnames.h"
static void sscr_check __P((SCR *));
static int sscr_getprompt __P((SCR *));
static int sscr_init __P((SCR *));
static int sscr_insert __P((SCR *));
static int sscr_matchprompt __P((SCR *, char *, size_t, size_t *));
static int sscr_pty __P((int *, int *, char *, struct termios *, void *));
static int sscr_setprompt __P((SCR *, char *, size_t));
/*
* ex_script -- : sc[ript][!] [file]
* Switch to script mode.
*
* PUBLIC: int ex_script __P((SCR *, EXCMD *));
*/
int
ex_script(sp, cmdp)
SCR *sp;
EXCMD *cmdp;
{
/* Vi only command. */
if (!F_ISSET(sp, SC_VI)) {
msgq(sp, M_ERR,
"150|The script command is only available in vi mode");
return (1);
}
/* Switch to the new file. */
if (cmdp->argc != 0 && ex_edit(sp, cmdp))
return (1);
/* Create the shell, figure out the prompt. */
if (sscr_init(sp))
return (1);
return (0);
}
/*
* sscr_init --
* Create a pty setup for a shell.
*/
static int
sscr_init(sp)
SCR *sp;
{
SCRIPT *sc;
char *sh, *sh_path;
/* We're going to need a shell. */
if (opts_empty(sp, O_SHELL, 0))
return (1);
MALLOC_RET(sp, sc, SCRIPT *, sizeof(SCRIPT));
sp->script = sc;
sc->sh_prompt = NULL;
sc->sh_prompt_len = 0;
/*
* There are two different processes running through this code.
* They are the shell and the parent.
*/
sc->sh_master = sc->sh_slave = -1;
if (tcgetattr(STDIN_FILENO, &sc->sh_term) == -1) {
msgq(sp, M_SYSERR, "tcgetattr");
goto err;
}
/*
* Turn off output postprocessing and echo.
*/
sc->sh_term.c_oflag &= ~OPOST;
sc->sh_term.c_cflag &= ~(ECHO|ECHOE|ECHONL|ECHOK);
#ifdef TIOCGWINSZ
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &sc->sh_win) == -1) {
msgq(sp, M_SYSERR, "tcgetattr");
goto err;
}
if (sscr_pty(&sc->sh_master,
&sc->sh_slave, sc->sh_name, &sc->sh_term, &sc->sh_win) == -1) {
msgq(sp, M_SYSERR, "pty");
goto err;
}
#else
if (sscr_pty(&sc->sh_master,
&sc->sh_slave, sc->sh_name, &sc->sh_term, NULL) == -1) {
msgq(sp, M_SYSERR, "pty");
goto err;
}
#endif
/*
* __TK__ huh?
* Don't use vfork() here, because the signal semantics differ from
* implementation to implementation.
*/
switch (sc->sh_pid = fork()) {
case -1: /* Error. */
msgq(sp, M_SYSERR, "fork");
err: if (sc->sh_master != -1)
(void)close(sc->sh_master);
if (sc->sh_slave != -1)
(void)close(sc->sh_slave);
return (1);
case 0: /* Utility. */
/*
* XXX
* So that shells that do command line editing turn it off.
*/
(void)setenv("TERM", "emacs", 1);
(void)setenv("TERMCAP", "emacs:", 1);
(void)setenv("EMACS", "t", 1);
(void)setsid();
#ifdef TIOCSCTTY
/*
* 4.4BSD allocates a controlling terminal using the TIOCSCTTY
* ioctl, not by opening a terminal device file. POSIX 1003.1
* doesn't define a portable way to do this. If TIOCSCTTY is
* not available, hope that the open does it.
*/
(void)ioctl(sc->sh_slave, TIOCSCTTY, 0);
#endif
(void)close(sc->sh_master);
(void)dup2(sc->sh_slave, STDIN_FILENO);
(void)dup2(sc->sh_slave, STDOUT_FILENO);
(void)dup2(sc->sh_slave, STDERR_FILENO);
(void)close(sc->sh_slave);
/* Assumes that all shells have -i. */
sh_path = O_STR(sp, O_SHELL);
if ((sh = strrchr(sh_path, '/')) == NULL)
sh = sh_path;
else
++sh;
execl(sh_path, sh, "-i", NULL);
msgq_str(sp, M_SYSERR, sh_path, "execl: %s");
_exit(127);
default: /* Parent. */
break;
}
if (sscr_getprompt(sp))
return (1);
F_SET(sp, SC_SCRIPT);
F_SET(sp->gp, G_SCRWIN);
return (0);
}
/*
* sscr_getprompt --
* Eat lines printed by the shell until a line with no trailing
* carriage return comes; set the prompt from that line.
*/
static int
sscr_getprompt(sp)
SCR *sp;
{
struct timeval tv;
CHAR_T *endp, *p, *t, buf[1024];
SCRIPT *sc;
fd_set fdset;
recno_t lline;
size_t llen, len;
u_int value;
int nr;
FD_ZERO(&fdset);
endp = buf;
len = sizeof(buf);
/* Wait up to a second for characters to read. */
tv.tv_sec = 5;
tv.tv_usec = 0;
sc = sp->script;
FD_SET(sc->sh_master, &fdset);
switch (select(sc->sh_master + 1, &fdset, NULL, NULL, &tv)) {
case -1: /* Error or interrupt. */
msgq(sp, M_SYSERR, "select");
goto prompterr;
case 0: /* Timeout */
msgq(sp, M_ERR, "Error: timed out");
goto prompterr;
case 1: /* Characters to read. */
break;
}
/* Read the characters. */
more: len = sizeof(buf) - (endp - buf);
switch (nr = read(sc->sh_master, endp, len)) {
case 0: /* EOF. */
msgq(sp, M_ERR, "Error: shell: EOF");
goto prompterr;
case -1: /* Error or interrupt. */
msgq(sp, M_SYSERR, "shell");
goto prompterr;
default:
endp += nr;
break;
}
/* If any complete lines, push them into the file. */
for (p = t = buf; p < endp; ++p) {
value = KEY_VAL(sp, *p);
if (value == K_CR || value == K_NL) {
if (db_last(sp, &lline) ||
db_append(sp, 0, lline, t, p - t))
goto prompterr;
t = p + 1;
}
}
if (p > buf) {
memmove(buf, t, endp - t);
endp = buf + (endp - t);
}
if (endp == buf)
goto more;
/* Wait up 1/10 of a second to make sure that we got it all. */
tv.tv_sec = 0;
tv.tv_usec = 100000;
switch (select(sc->sh_master + 1, &fdset, NULL, NULL, &tv)) {
case -1: /* Error or interrupt. */
msgq(sp, M_SYSERR, "select");
goto prompterr;
case 0: /* Timeout */
break;
case 1: /* Characters to read. */
goto more;
}
/* Timed out, so theoretically we have a prompt. */
llen = endp - buf;
endp = buf;
/* Append the line into the file. */
if (db_last(sp, &lline) || db_append(sp, 0, lline, buf, llen)) {
prompterr: sscr_end(sp);
return (1);
}
return (sscr_setprompt(sp, buf, llen));
}
/*
* sscr_exec --
* Take a line and hand it off to the shell.
*
* PUBLIC: int sscr_exec __P((SCR *, recno_t));
*/
int
sscr_exec(sp, lno)
SCR *sp;
recno_t lno;
{
SCRIPT *sc;
recno_t last_lno;
size_t blen, len, last_len, tlen;
int isempty, matchprompt, nw, rval;
char *bp, *p;
bp = NULL; /* XXXGCC -Wuninitialized */
/* If there's a prompt on the last line, append the command. */
if (db_last(sp, &last_lno))
return (1);
if (db_get(sp, last_lno, DBG_FATAL, &p, &last_len))
return (1);
if (sscr_matchprompt(sp, p, last_len, &tlen) && tlen == 0) {
matchprompt = 1;
GET_SPACE_RET(sp, bp, blen, last_len + 128);
memmove(bp, p, last_len);
} else
matchprompt = 0;
/* Get something to execute. */
if (db_eget(sp, lno, &p, &len, &isempty)) {
if (isempty)
goto empty;
goto err1;
}
/* Empty lines aren't interesting. */
if (len == 0)
goto empty;
/* Delete any prompt. */
if (sscr_matchprompt(sp, p, len, &tlen)) {
if (tlen == len) {
empty: msgq(sp, M_BERR, "151|No command to execute");
goto err1;
}
p += (len - tlen);
len = tlen;
}
/* Push the line to the shell. */
sc = sp->script;
if ((nw = write(sc->sh_master, p, len)) != len)
goto err2;
rval = 0;
if (write(sc->sh_master, "\n", 1) != 1) {
err2: if (nw == 0)
errno = EIO;
msgq(sp, M_SYSERR, "shell");
goto err1;
}
if (matchprompt) {
ADD_SPACE_RET(sp, bp, blen, last_len + len);
memmove(bp + last_len, p, len);
if (db_set(sp, last_lno, bp, last_len + len))
err1: rval = 1;
}
if (matchprompt)
FREE_SPACE(sp, bp, blen);
return (rval);
}
/*
* sscr_input --
* Read any waiting shell input.
*
* PUBLIC: int sscr_input __P((SCR *));
*/
int
sscr_input(sp)
SCR *sp;
{
GS *gp;
struct timeval poll;
fd_set rdfd;
int maxfd;
gp = sp->gp;
loop: maxfd = 0;
FD_ZERO(&rdfd);
poll.tv_sec = 0;
poll.tv_usec = 0;
/* Set up the input mask. */
for (sp = gp->dq.cqh_first; sp != (void *)&gp->dq; sp = sp->q.cqe_next)
if (F_ISSET(sp, SC_SCRIPT)) {
FD_SET(sp->script->sh_master, &rdfd);
if (sp->script->sh_master > maxfd)
maxfd = sp->script->sh_master;
}
/* Check for input. */
switch (select(maxfd + 1, &rdfd, NULL, NULL, &poll)) {
case -1:
msgq(sp, M_SYSERR, "select");
return (1);
case 0:
return (0);
default:
break;
}
/* Read the input. */
for (sp = gp->dq.cqh_first; sp != (void *)&gp->dq; sp = sp->q.cqe_next)
if (F_ISSET(sp, SC_SCRIPT) &&
FD_ISSET(sp->script->sh_master, &rdfd) && sscr_insert(sp))
return (1);
goto loop;
}
/*
* sscr_insert --
* Take a line from the shell and insert it into the file.
*/
static int
sscr_insert(sp)
SCR *sp;
{
struct timeval tv;
CHAR_T *endp, *p, *t;
SCRIPT *sc;
fd_set rdfd;
recno_t lno;
size_t blen, len, tlen;
u_int value;
int nr, rval;
char *bp;
len = 0; /* XXXGCC -Wuninitialized */
/* Find out where the end of the file is. */
if (db_last(sp, &lno))
return (1);
#define MINREAD 1024
GET_SPACE_RET(sp, bp, blen, MINREAD);
endp = bp;
/* Read the characters. */
rval = 1;
sc = sp->script;
more: switch (nr = read(sc->sh_master, endp, MINREAD)) {
case 0: /* EOF; shell just exited. */
sscr_end(sp);
rval = 0;
goto ret;
case -1: /* Error or interrupt. */
msgq(sp, M_SYSERR, "shell");
goto ret;
default:
endp += nr;
break;
}
/* Append the lines into the file. */
for (p = t = bp; p < endp; ++p) {
value = KEY_VAL(sp, *p);
if (value == K_CR || value == K_NL) {
len = p - t;
if (db_append(sp, 1, lno++, t, len))
goto ret;
t = p + 1;
}
}
if (p > t) {
len = p - t;
/*
* If the last thing from the shell isn't another prompt, wait
* up to 1/10 of a second for more stuff to show up, so that
* we don't break the output into two separate lines. Don't
* want to hang indefinitely because some program is hanging,
* confused the shell, or whatever.
*/
if (!sscr_matchprompt(sp, t, len, &tlen) || tlen != 0) {
tv.tv_sec = 0;
tv.tv_usec = 100000;
FD_ZERO(&rdfd);
FD_SET(sc->sh_master, &rdfd);
if (select(sc->sh_master + 1,
&rdfd, NULL, NULL, &tv) == 1) {
memmove(bp, t, len);
endp = bp + len;
goto more;
}
}
if (sscr_setprompt(sp, t, len))
return (1);
if (db_append(sp, 1, lno++, t, len))
goto ret;
}
/* The cursor moves to EOF. */
sp->lno = lno;
sp->cno = len ? len - 1 : 0;
rval = vs_refresh(sp, 1);
ret: FREE_SPACE(sp, bp, blen);
return (rval);
}
/*
* sscr_setprompt --
*
* Set the prompt to the last line we got from the shell.
*
*/
static int
sscr_setprompt(sp, buf, len)
SCR *sp;
char *buf;
size_t len;
{
SCRIPT *sc;
sc = sp->script;
if (sc->sh_prompt)
free(sc->sh_prompt);
MALLOC(sp, sc->sh_prompt, char *, len + 1);
if (sc->sh_prompt == NULL) {
sscr_end(sp);
return (1);
}
memmove(sc->sh_prompt, buf, len);
sc->sh_prompt_len = len;
sc->sh_prompt[len] = '\0';
return (0);
}
/*
* sscr_matchprompt --
* Check to see if a line matches the prompt. Nul's indicate
* parts that can change, in both content and size.
*/
static int
sscr_matchprompt(sp, lp, line_len, lenp)
SCR *sp;
char *lp;
size_t line_len, *lenp;
{
SCRIPT *sc;
size_t prompt_len;
char *pp;
sc = sp->script;
if (line_len < (prompt_len = sc->sh_prompt_len))
return (0);
for (pp = sc->sh_prompt;
prompt_len && line_len; --prompt_len, --line_len) {
if (*pp == '\0') {
for (; prompt_len && *pp == '\0'; --prompt_len, ++pp);
if (!prompt_len)
return (0);
for (; line_len && *lp != *pp; --line_len, ++lp);
if (!line_len)
return (0);
}
if (*pp++ != *lp++)
break;
}
if (prompt_len)
return (0);
if (lenp != NULL)
*lenp = line_len;
return (1);
}
/*
* sscr_end --
* End the pipe to a shell.
*
* PUBLIC: int sscr_end __P((SCR *));
*/
int
sscr_end(sp)
SCR *sp;
{
SCRIPT *sc;
if ((sc = sp->script) == NULL)
return (0);
/* Turn off the script flags. */
F_CLR(sp, SC_SCRIPT);
sscr_check(sp);
/* Close down the parent's file descriptors. */
if (sc->sh_master != -1)
(void)close(sc->sh_master);
if (sc->sh_slave != -1)
(void)close(sc->sh_slave);
/* This should have killed the child. */
(void)proc_wait(sp, (long)sc->sh_pid, "script-shell", 0, 0);
/* Free memory. */
free(sc->sh_prompt);
free(sc);
sp->script = NULL;
return (0);
}
/*
* sscr_check --
* Set/clear the global scripting bit.
*/
static void
sscr_check(sp)
SCR *sp;
{
GS *gp;
gp = sp->gp;
for (sp = gp->dq.cqh_first; sp != (void *)&gp->dq; sp = sp->q.cqe_next)
if (F_ISSET(sp, SC_SCRIPT)) {
F_SET(gp, G_SCRWIN);
return;
}
F_CLR(gp, G_SCRWIN);
}
#ifdef HAVE_SYS5_PTY
static int ptys_open __P((int, char *));
static int ptym_open __P((char *));
static int
sscr_pty(amaster, aslave, name, termp, winp)
int *amaster, *aslave;
char *name;
struct termios *termp;
void *winp;
{
int master, slave, ttygid;
/* open master terminal */
if ((master = ptym_open(name)) < 0) {
errno = ENOENT; /* out of ptys */
return (-1);
}
/* open slave terminal */
if ((slave = ptys_open(master, name)) >= 0) {
*amaster = master;
*aslave = slave;
} else {
errno = ENOENT; /* out of ptys */
return (-1);
}
if (termp)
(void) tcsetattr(slave, TCSAFLUSH, termp);
#ifdef TIOCSWINSZ
if (winp != NULL)
(void) ioctl(slave, TIOCSWINSZ, (struct winsize *)winp);
#endif
return (0);
}
/*
* ptym_open --
* This function opens a master pty and returns the file descriptor
* to it. pts_name is also returned which is the name of the slave.
*/
static int
ptym_open(pts_name)
char *pts_name;
{
int fdm;
char *ptr, *ptsname();
strcpy(pts_name, _PATH_SYSV_PTY);
if ((fdm = open(pts_name, O_RDWR)) < 0 )
return (-1);
if (grantpt(fdm) < 0) {
close(fdm);
return (-2);
}
if (unlockpt(fdm) < 0) {
close(fdm);
return (-3);
}
if (unlockpt(fdm) < 0) {
close(fdm);
return (-3);
}
/* get slave's name */
if ((ptr = ptsname(fdm)) == NULL) {
close(fdm);
return (-3);
}
strcpy(pts_name, ptr);
return (fdm);
}
/*
* ptys_open --
* This function opens the slave pty.
*/
static int
ptys_open(fdm, pts_name)
int fdm;
char *pts_name;
{
int fds;
if ((fds = open(pts_name, O_RDWR)) < 0) {
close(fdm);
return (-5);
}
if (ioctl(fds, I_PUSH, "ptem") < 0) {
close(fds);
close(fdm);
return (-6);
}
if (ioctl(fds, I_PUSH, "ldterm") < 0) {
close(fds);
close(fdm);
return (-7);
}
if (ioctl(fds, I_PUSH, "ttcompat") < 0) {
close(fds);
close(fdm);
return (-8);
}
return (fds);
}
#else /* !HAVE_SYS5_PTY */
static int
sscr_pty(amaster, aslave, name, termp, winp)
int *amaster, *aslave;
char *name;
struct termios *termp;
void *winp;
{
static char line[] = "/dev/ptyXX";
register char *cp1, *cp2;
register int master, slave, ttygid;
struct group *gr;
if ((gr = getgrnam("tty")) != NULL)
ttygid = gr->gr_gid;
else
ttygid = -1;
for (cp1 = "pqrs"; *cp1; cp1++) {
line[8] = *cp1;
for (cp2 = "0123456789abcdef"; *cp2; cp2++) {
line[5] = 'p';
line[9] = *cp2;
if ((master = open(line, O_RDWR, 0)) == -1) {
if (errno == ENOENT)
return (-1); /* out of ptys */
} else {
line[5] = 't';
(void) chown(line, getuid(), ttygid);
(void) chmod(line, S_IRUSR|S_IWUSR|S_IWGRP);
#ifdef HAVE_REVOKE
(void) revoke(line);
#endif
if ((slave = open(line, O_RDWR, 0)) != -1) {
*amaster = master;
*aslave = slave;
if (name)
strcpy(name, line);
if (termp)
(void) tcsetattr(slave,
TCSAFLUSH, termp);
#ifdef TIOCSWINSZ
if (winp)
(void) ioctl(slave, TIOCSWINSZ,
(char *)winp);
#endif
return (0);
}
(void) close(master);
}
}
}
errno = ENOENT; /* out of ptys */
return (-1);
}
#endif /* HAVE_SYS5_PTY */
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