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/* $Id: term_tag.c,v 1.6 2021/03/30 17:16:55 schwarze Exp $ */
/*
* Copyright (c) 2015,2016,2018,2019,2020 Ingo Schwarze <schwarze@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Functions to write a ctags(1) file.
* For use by the mandoc(1) ASCII and UTF-8 formatters only.
*/
#include "config.h"
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "mandoc.h"
#include "roff.h"
#include "roff_int.h"
#include "tag.h"
#include "term_tag.h"
static void tag_signal(int) __attribute__((__noreturn__));
static struct tag_files tag_files;
/*
* Prepare for using a pager.
* Not all pagers are capable of using a tag file,
* but for simplicity, create it anyway.
*/
struct tag_files *
term_tag_init(const char *outfilename, const char *suffix,
const char *tagfilename)
{
struct sigaction sa;
int ofd; /* In /tmp/, dup(2)ed to stdout. */
int tfd;
ofd = tfd = -1;
tag_files.tfs = NULL;
tag_files.tcpgid = -1;
/* Clean up when dying from a signal. */
memset(&sa, 0, sizeof(sa));
sigfillset(&sa.sa_mask);
sa.sa_handler = tag_signal;
sigaction(SIGHUP, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
/*
* POSIX requires that a process calling tcsetpgrp(3)
* from the background gets a SIGTTOU signal.
* In that case, do not stop.
*/
sa.sa_handler = SIG_IGN;
sigaction(SIGTTOU, &sa, NULL);
/* Save the original standard output for use by the pager. */
if ((tag_files.ofd = dup(STDOUT_FILENO)) == -1) {
mandoc_msg(MANDOCERR_DUP, 0, 0, "%s", strerror(errno));
goto fail;
}
/* Create both temporary output files. */
if (outfilename == NULL) {
(void)snprintf(tag_files.ofn, sizeof(tag_files.ofn),
"/tmp/man.XXXXXXXXXX%s", suffix);
if ((ofd = mkstemps(tag_files.ofn, strlen(suffix))) == -1) {
mandoc_msg(MANDOCERR_MKSTEMP, 0, 0,
"%s: %s", tag_files.ofn, strerror(errno));
goto fail;
}
} else {
(void)strlcpy(tag_files.ofn, outfilename,
sizeof(tag_files.ofn));
unlink(outfilename);
ofd = open(outfilename, O_WRONLY | O_CREAT | O_EXCL, 0644);
if (ofd == -1) {
mandoc_msg(MANDOCERR_OPEN, 0, 0,
"%s: %s", outfilename, strerror(errno));
goto fail;
}
}
if (tagfilename == NULL) {
(void)strlcpy(tag_files.tfn, "/tmp/man.XXXXXXXXXX",
sizeof(tag_files.tfn));
if ((tfd = mkstemp(tag_files.tfn)) == -1) {
mandoc_msg(MANDOCERR_MKSTEMP, 0, 0,
"%s: %s", tag_files.tfn, strerror(errno));
goto fail;
}
} else {
(void)strlcpy(tag_files.tfn, tagfilename,
sizeof(tag_files.tfn));
unlink(tagfilename);
tfd = open(tagfilename, O_WRONLY | O_CREAT | O_EXCL, 0644);
if (tfd == -1) {
mandoc_msg(MANDOCERR_OPEN, 0, 0,
"%s: %s", tagfilename, strerror(errno));
goto fail;
}
}
if ((tag_files.tfs = fdopen(tfd, "w")) == NULL) {
mandoc_msg(MANDOCERR_FDOPEN, 0, 0, "%s", strerror(errno));
goto fail;
}
tfd = -1;
if (dup2(ofd, STDOUT_FILENO) == -1) {
mandoc_msg(MANDOCERR_DUP, 0, 0, "%s", strerror(errno));
goto fail;
}
close(ofd);
return &tag_files;
fail:
term_tag_unlink();
if (ofd != -1)
close(ofd);
if (tfd != -1)
close(tfd);
if (tag_files.ofd != -1) {
close(tag_files.ofd);
tag_files.ofd = -1;
}
return NULL;
}
void
term_tag_write(struct roff_node *n, size_t line)
{
const char *cp;
int len;
if (tag_files.tfs == NULL)
return;
cp = n->tag == NULL ? n->child->string : n->tag;
if (cp[0] == '\\' && (cp[1] == '&' || cp[1] == 'e'))
cp += 2;
len = strcspn(cp, " \t\\");
fprintf(tag_files.tfs, "%.*s %s %zu\n",
len, cp, tag_files.ofn, line);
}
/*
* Close both output files and restore the original standard output
* to the terminal. In the unlikely case that the latter fails,
* trying to start a pager would be useless, so report the failure
* to the main program.
*/
int
term_tag_close(void)
{
int irc = 0;
if (tag_files.tfs != NULL) {
fclose(tag_files.tfs);
tag_files.tfs = NULL;
}
if (tag_files.ofd != -1) {
fflush(stdout);
if ((irc = dup2(tag_files.ofd, STDOUT_FILENO)) == -1)
mandoc_msg(MANDOCERR_DUP, 0, 0, "%s", strerror(errno));
close(tag_files.ofd);
tag_files.ofd = -1;
}
return irc;
}
void
term_tag_unlink(void)
{
pid_t tc_pgid;
if (tag_files.tcpgid != -1) {
tc_pgid = tcgetpgrp(STDOUT_FILENO);
if (tc_pgid == tag_files.pager_pid ||
tc_pgid == getpgid(0) ||
getpgid(tc_pgid) == -1)
(void)tcsetpgrp(STDOUT_FILENO, tag_files.tcpgid);
}
if (strncmp(tag_files.ofn, "/tmp/man.", 9) == 0) {
unlink(tag_files.ofn);
*tag_files.ofn = '\0';
}
if (strncmp(tag_files.tfn, "/tmp/man.", 9) == 0) {
unlink(tag_files.tfn);
*tag_files.tfn = '\0';
}
}
static void
tag_signal(int signum)
{
struct sigaction sa;
term_tag_unlink();
memset(&sa, 0, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_handler = SIG_DFL;
sigaction(signum, &sa, NULL);
kill(getpid(), signum);
/* NOTREACHED */
_exit(1);
}
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