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/* Handle configuration data.
Copyright (C) 2021-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <dirent.h>
#include <libc-symbols.h>
#include <locale.h>
#include <sys/types.h>
#if IS_IN (libc)
# include <libio/libioP.h>
# define __getdelim(line, len, c, fp) __getdelim (line, len, c, fp)
# undef isspace
# define isspace(__c) __isspace_l ((__c), _nl_C_locobj_ptr)
# define asprintf __asprintf
# define opendir __opendir
# define readdir64 __readdir64
# define closedir __closedir
# define mempcpy __mempcpy
# define struct_stat64 struct __stat64_t64
# define lstat64 __lstat64_time64
# define feof_unlocked __feof_unlocked
#else
# define struct_stat64 struct stat64
#endif
/* Name of the file containing the module information in the directories
along the path. */
static const char gconv_conf_filename[] = "gconv-modules";
static void add_alias (char *);
static void add_module (char *, const char *, size_t, int);
/* Read the next configuration file. */
static bool
read_conf_file (const char *filename, const char *directory, size_t dir_len)
{
/* Note the file is opened with cancellation in the I/O functions
disabled. */
FILE *fp = fopen (filename, "rce");
char *line = NULL;
size_t line_len = 0;
static int modcounter;
/* Don't complain if a file is not present or readable, simply silently
ignore it. */
if (fp == NULL)
return false;
/* No threads reading from this stream. */
__fsetlocking (fp, FSETLOCKING_BYCALLER);
/* Process the known entries of the file. Comments start with `#' and
end with the end of the line. Empty lines are ignored. */
while (!feof_unlocked (fp))
{
char *rp, *endp, *word;
ssize_t n = __getdelim (&line, &line_len, '\n', fp);
if (n < 0)
/* An error occurred. */
break;
rp = line;
/* Terminate the line (excluding comments or newline) by an NUL byte
to simplify the following code. */
endp = strchr (rp, '#');
if (endp != NULL)
*endp = '\0';
else
if (rp[n - 1] == '\n')
rp[n - 1] = '\0';
while (isspace (*rp))
++rp;
/* If this is an empty line go on with the next one. */
if (rp == endp)
continue;
word = rp;
while (*rp != '\0' && !isspace (*rp))
++rp;
if (rp - word == sizeof ("alias") - 1
&& memcmp (word, "alias", sizeof ("alias") - 1) == 0)
add_alias (rp);
else if (rp - word == sizeof ("module") - 1
&& memcmp (word, "module", sizeof ("module") - 1) == 0)
add_module (rp, directory, dir_len, modcounter++);
/* else */
/* Otherwise ignore the line. */
}
free (line);
fclose (fp);
return true;
}
/* Prefix DIR (with length DIR_LEN) with PREFIX if the latter is non-NULL and
parse configuration in it. */
static __always_inline bool
gconv_parseconfdir (const char *prefix, const char *dir, size_t dir_len)
{
/* No slash needs to be inserted between dir and gconv_conf_filename; dir
already ends in a slash. The additional 2 is to accommodate the ".d"
when looking for configuration files in gconv-modules.d. */
size_t buflen = dir_len + sizeof (gconv_conf_filename) + 2;
char *buf = malloc (buflen + (prefix != NULL ? strlen (prefix) : 0));
char *cp = buf;
bool found = false;
if (buf == NULL)
return false;
if (prefix != NULL)
cp = stpcpy (cp, prefix);
cp = mempcpy (mempcpy (cp, dir, dir_len), gconv_conf_filename,
sizeof (gconv_conf_filename));
/* Read the gconv-modules configuration file first. */
found = read_conf_file (buf, dir, dir_len);
/* Next, see if there is a gconv-modules.d directory containing
configuration files and if it is non-empty. */
cp--;
cp[0] = '.';
cp[1] = 'd';
cp[2] = '\0';
DIR *confdir = opendir (buf);
if (confdir != NULL)
{
struct dirent64 *ent;
while ((ent = readdir64 (confdir)) != NULL)
{
if (ent->d_type != DT_REG && ent->d_type != DT_UNKNOWN)
continue;
size_t len = strlen (ent->d_name);
const char *suffix = ".conf";
if (len > strlen (suffix)
&& strcmp (ent->d_name + len - strlen (suffix), suffix) == 0)
{
char *conf;
struct_stat64 st;
if (asprintf (&conf, "%s/%s", buf, ent->d_name) < 0)
continue;
if (ent->d_type != DT_UNKNOWN
|| (lstat64 (conf, &st) != -1 && S_ISREG (st.st_mode)))
found |= read_conf_file (conf, dir, dir_len);
free (conf);
}
}
closedir (confdir);
}
free (buf);
return found;
}
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