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// -*- C++ -*-
/* Copyright (C) 1989-2020 Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.com)
This file is part of groff.
groff is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or
(at your option) any later version.
groff is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "lib.h"
#include <errno.h>
#include <stdlib.h>
#include "posix.h"
#include "errarg.h"
#include "error.h"
#include "nonposix.h"
// If this is set, create temporary files there
#define GROFF_TMPDIR_ENVVAR "GROFF_TMPDIR"
// otherwise if this is set, create temporary files there
#define TMPDIR_ENVVAR "TMPDIR"
// otherwise, on MS-DOS or MS-Windows ...
#if defined(__MSDOS__) || defined(_WIN32)
// if either of these is set, create temporary files there
// (giving priority to WIN32_TMPDIR_ENVVAR)
#define WIN32_TMPDIR_ENVVAR "TMP"
#define MSDOS_TMPDIR_ENVVAR "TEMP"
#endif
// otherwise if P_tmpdir is defined, create temporary files there
#ifdef P_tmpdir
# define DEFAULT_TMPDIR P_tmpdir
#else
// otherwise create temporary files here.
# define DEFAULT_TMPDIR "/tmp"
#endif
// Use this as the prefix for temporary filenames.
#define TMPFILE_PREFIX_SHORT ""
#define TMPFILE_PREFIX_LONG "groff"
char *tmpfile_prefix;
size_t tmpfile_prefix_len;
int use_short_postfix = 0;
struct temp_init {
temp_init();
~temp_init();
} _temp_init;
temp_init::temp_init()
{
// First, choose a location for creating temporary files...
const char *tem;
// using the first match for any of the environment specs in listed order.
if (
(tem = getenv(GROFF_TMPDIR_ENVVAR)) == 0
&& (tem = getenv(TMPDIR_ENVVAR)) == 0
#if defined(__MSDOS__) || defined(_WIN32)
// If we didn't find a match for either of the above
// (which are preferred, regardless of the host operating system),
// and we are hosted on either MS-Windows or MS-DOS,
// then try the Microsoft conventions.
&& (tem = getenv(WIN32_TMPDIR_ENVVAR)) == 0
&& (tem = getenv(MSDOS_TMPDIR_ENVVAR)) == 0
#endif
)
// If we didn't find an environment spec fall back to this default.
tem = DEFAULT_TMPDIR;
size_t tem_len = strlen(tem);
const char *tem_end = tem + tem_len - 1;
int need_slash = (strchr(DIR_SEPS, *tem_end) == 0) ? 1 : 0;
char *tem2 = new char[tem_len + need_slash + 1];
strcpy(tem2, tem);
if (need_slash)
strcat(tem2, "/");
const char *tem3 = TMPFILE_PREFIX_LONG;
if (file_name_max(tem2) <= 14) {
tem3 = TMPFILE_PREFIX_SHORT;
use_short_postfix = 1;
}
tmpfile_prefix_len = tem_len + need_slash + strlen(tem3);
tmpfile_prefix = new char[tmpfile_prefix_len + 1];
strcpy(tmpfile_prefix, tem2);
strcat(tmpfile_prefix, tem3);
delete[] tem2;
}
temp_init::~temp_init()
{
delete[] tmpfile_prefix;
}
/*
* Generate a temporary name template with a postfix
* immediately after the TMPFILE_PREFIX.
* It uses the groff preferences for a temporary directory.
* Note that no file name is either created or opened,
* only the *template* is returned.
*/
char *xtmptemplate(const char *postfix_long, const char *postfix_short)
{
const char *postfix = use_short_postfix ? postfix_short : postfix_long;
int postlen = 0;
if (postfix)
postlen = strlen(postfix);
char *templ = new char[tmpfile_prefix_len + postlen + 6 + 1];
strcpy(templ, tmpfile_prefix);
if (postlen > 0)
strcat(templ, postfix);
strcat(templ, "XXXXXX");
return templ;
}
// The trick with unlinking the temporary file while it is still in
// use is not portable, it will fail on MS-DOS and most MS-Windows
// filesystems. So it cannot be used on non-Posix systems.
// Instead, we maintain a list of files to be deleted on exit.
// This should be portable to all platforms.
struct xtmpfile_list {
char *fname;
xtmpfile_list *next;
xtmpfile_list(char *fn) : fname(fn), next(0) {}
};
xtmpfile_list *xtmpfiles_to_delete = 0;
struct xtmpfile_list_init {
~xtmpfile_list_init();
} _xtmpfile_list_init;
xtmpfile_list_init::~xtmpfile_list_init()
{
xtmpfile_list *x = xtmpfiles_to_delete;
while (x != 0) {
if (unlink(x->fname) < 0)
error("cannot unlink '%1': %2", x->fname, strerror(errno));
xtmpfile_list *tmp = x;
x = x->next;
delete[] tmp->fname;
delete tmp;
}
}
static void add_tmp_file(const char *name)
{
char *s = new char[strlen(name)+1];
strcpy(s, name);
xtmpfile_list *x = new xtmpfile_list(s);
x->next = xtmpfiles_to_delete;
xtmpfiles_to_delete = x;
}
// Open a temporary file and with fatal error on failure.
FILE *xtmpfile(char **namep,
const char *postfix_long, const char *postfix_short,
int do_unlink)
{
char *templ = xtmptemplate(postfix_long, postfix_short);
errno = 0;
int fd = mkstemp(templ);
if (fd < 0)
fatal("cannot create temporary file: %1", strerror(errno));
errno = 0;
FILE *fp = fdopen(fd, FOPEN_RWB); // many callers of xtmpfile use binary I/O
if (!fp)
fatal("fdopen: %1", strerror(errno));
if (do_unlink)
add_tmp_file(templ);
if (namep)
*namep = templ;
else
delete[] templ;
return fp;
}
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