4.4BSD/usr/src/contrib/nvi/nvi/filter.c
/*-
* Copyright (c) 1991, 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.
*/
#ifndef lint
static char sccsid[] = "@(#)filter.c 8.1 (Berkeley) 6/9/93";
#endif /* not lint */
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include "vi.h"
#include "excmd.h"
/*
* filtercmd --
* Run a range of lines through a filter program and replace the
* original text with the stdout/stderr output of the filter.
*/
int
filtercmd(sp, ep, fm, tm, rp, cmd, ftype)
SCR *sp;
EXF *ep;
MARK *fm, *tm, *rp;
char *cmd;
enum filtertype ftype;
{
FILE *ifp, *ofp; /* GCC: can't be uninitialized. */
pid_t pid;
sig_ret_t intsave, quitsave;
sigset_t bmask, omask;
recno_t lno;
size_t len;
int input[2], output[2], pstat, rval;
char *name;
/* Input and output are named from the child's point of view. */
input[0] = input[1] = output[0] = output[1] = -1;
/* Set default cursor position. */
*rp = *fm;
/*
* If child isn't supposed to want input or send output, redirect
* from or to /dev/null. Otherwise open up the pipe and get a stdio
* buffer for it.
*/
if (ftype == NOINPUT) {
if ((input[0] = open(_PATH_DEVNULL, O_RDONLY, 0)) < 0) {
msgq(sp, M_ERR,
"filter: %s: %s", _PATH_DEVNULL, strerror(errno));
goto err;
}
} else
if (pipe(input) < 0 ||
(ifp = fdopen(input[1], "w")) == NULL) {
msgq(sp, M_ERR, "filter: %s", strerror(errno));
goto err;
}
if (ftype == NOOUTPUT) {
if ((output[1] = open(_PATH_DEVNULL, O_WRONLY, 0)) < 0) {
msgq(sp, M_ERR,
"filter: %s: %s", _PATH_DEVNULL, strerror(errno));
goto err;
}
} else
if (pipe(output) < 0 ||
(ofp = fdopen(output[0], "r")) == NULL) {
msgq(sp, M_ERR, "filter: %s", strerror(errno));
goto err;
}
sigemptyset(&bmask);
sigaddset(&bmask, SIGCHLD);
(void)sigprocmask(SIG_BLOCK, &bmask, &omask);
switch (pid = vfork()) {
case -1: /* Error. */
(void)sigprocmask(SIG_SETMASK, &omask, NULL);
msgq(sp, M_ERR, "filter: %s", strerror(errno));
err: if (input[0] != -1)
(void)close(input[0]);
if (input[0] != -1)
(void)close(input[0]);
if (output[0] != -1)
(void)close(output[0]);
if (output[1] != -1)
(void)close(input[1]);
return (1);
/* NOTREACHED */
case 0: /* Child. */
(void)sigprocmask(SIG_SETMASK, &omask, NULL);
/*
* Redirect stdin from the read end of the input pipe,
* and redirect stdout/stderr to the write end of the
* output pipe.
*/
(void)dup2(input[0], STDIN_FILENO);
(void)dup2(output[1], STDOUT_FILENO);
(void)dup2(output[1], STDERR_FILENO);
/* Close the child's pipe file descriptors. */
(void)close(input[0]);
if (ftype != NOINPUT)
(void)close(input[1]);
if (ftype != NOOUTPUT)
(void)close(output[0]);
(void)close(output[1]);
if ((name = strrchr(O_STR(sp, O_SHELL), '/')) == NULL)
name = O_STR(sp, O_SHELL);
else
++name;
execl(O_STR(sp, O_SHELL), name, "-c", cmd, NULL);
msgq(sp, M_ERR,
"exec: %s: %s", O_STR(sp, O_SHELL), strerror(errno));
_exit (1);
/* NOTREACHED */
}
/* Close the pipe ends the parent won't use. */
(void)close(input[0]);
(void)close(output[1]);
/*
* Write the selected lines to the write end of the input pipe.
* Ifp is closed by ex_writefp.
*/
rval = 0;
if (ftype != NOINPUT)
if (ex_writefp(sp, ep, "filter", ifp, fm, tm, 0))
rval = 1;
else {
/* Delete old text, if any. */
for (lno = tm->lno; lno >= fm->lno; --lno)
if (file_dline(sp, ep, lno))
rval = 1;
sp->rptlines[L_DELETED] += (tm->lno - fm->lno) + 1;
}
if (rval == 0) {
/*
* Read the output from the read end of the output pipe.
* Decrement the line number, ex_readfp appends to the
* MARK. Ofp is closed by ex_readfp. Set the cursor to
* the first line read in.
*/
if (ftype != NOOUTPUT) {
rp->lno = fm->lno;
--fm->lno;
rval = ex_readfp(sp, ep,
"filter", ofp, fm, &sp->rptlines[L_ADDED]);
}
}
/* Wait for the child to finish. */
intsave = signal(SIGINT, SIG_IGN);
quitsave = signal(SIGQUIT, SIG_IGN);
(void)waitpid(pid, &pstat, 0);
(void)sigprocmask(SIG_SETMASK, &omask, NULL);
(void)signal(SIGINT, intsave);
(void)signal(SIGQUIT, quitsave);
if (WIFSIGNALED(pstat)) {
len = strlen(cmd);
msgq(sp, M_ERR,
"%.*s%s: exited with signal %d%s.",
MIN(len, 10), cmd, len > 10 ? "..." : "",
WTERMSIG(pstat), WCOREDUMP(pstat) ? "; core dumped" : "");
return (1);
} else if (WIFEXITED(pstat) && WEXITSTATUS(pstat)) {
len = strlen(cmd);
msgq(sp, M_ERR, "%.*s%s: exited with status %d",
MIN(len, 10), cmd,
len > 10 ? "..." : "", WEXITSTATUS(pstat));
return (1);
}
return (0);
}