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539 lines
14 KiB
C
539 lines
14 KiB
C
/* Handle configuration data.
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Copyright (C) 1997-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <locale.h>
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#include <search.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/param.h>
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#include <libc-lock.h>
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#include <gconv_int.h>
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#include <gconv_parseconfdir.h>
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/* This is the default path where we look for module lists. */
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static const char default_gconv_path[] = GCONV_PATH;
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/* Type to represent search path. */
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struct path_elem
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{
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const char *name;
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size_t len;
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};
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/* The path elements, as determined by the __gconv_get_path function.
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All path elements end in a slash. */
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struct path_elem *__gconv_path_elem;
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/* Maximum length of a single path element in __gconv_path_elem. */
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size_t __gconv_max_path_elem_len;
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/* We use the following struct if we couldn't allocate memory. */
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static const struct path_elem empty_path_elem = { NULL, 0 };
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/* Filename extension for the modules. */
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#ifndef MODULE_EXT
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# define MODULE_EXT ".so"
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#endif
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static const char gconv_module_ext[] = MODULE_EXT;
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/* We have a few builtin transformations. */
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static struct gconv_module builtin_modules[] =
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{
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#define BUILTIN_TRANSFORMATION(From, To, Cost, Name, Fct, BtowcFct, \
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MinF, MaxF, MinT, MaxT) \
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{ \
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.from_string = From, \
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.to_string = To, \
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.cost_hi = Cost, \
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.cost_lo = INT_MAX, \
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.module_name = Name \
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},
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#define BUILTIN_ALIAS(From, To)
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#include "gconv_builtin.h"
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#undef BUILTIN_TRANSFORMATION
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#undef BUILTIN_ALIAS
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};
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static const char builtin_aliases[] =
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{
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#define BUILTIN_TRANSFORMATION(From, To, Cost, Name, Fct, BtowcFct, \
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MinF, MaxF, MinT, MaxT)
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#define BUILTIN_ALIAS(From, To) From "\0" To "\0"
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#include "gconv_builtin.h"
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#undef BUILTIN_TRANSFORMATION
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#undef BUILTIN_ALIAS
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};
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/* Value of the GCONV_PATH environment variable. */
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const char *__gconv_path_envvar;
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/* Test whether there is already a matching module known. */
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static int
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detect_conflict (const char *alias)
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{
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struct gconv_module *node = __gconv_modules_db;
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while (node != NULL)
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{
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int cmpres = strcmp (alias, node->from_string);
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if (cmpres == 0)
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/* We have a conflict. */
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return 1;
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else if (cmpres < 0)
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node = node->left;
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else
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node = node->right;
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}
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return node != NULL;
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}
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/* The actual code to add aliases. */
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static void
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add_alias2 (const char *from, const char *to, const char *wp)
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{
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/* Test whether this alias conflicts with any available module. */
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if (detect_conflict (from))
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/* It does conflict, don't add the alias. */
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return;
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struct gconv_alias *new_alias = (struct gconv_alias *)
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malloc (sizeof (struct gconv_alias) + (wp - from));
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if (new_alias != NULL)
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{
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void **inserted;
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new_alias->fromname = memcpy ((char *) new_alias
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+ sizeof (struct gconv_alias),
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from, wp - from);
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new_alias->toname = new_alias->fromname + (to - from);
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inserted = (void **) __tsearch (new_alias, &__gconv_alias_db,
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__gconv_alias_compare);
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if (inserted == NULL || *inserted != new_alias)
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/* Something went wrong, free this entry. */
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free (new_alias);
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}
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}
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/* Add new alias. */
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static void
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add_alias (char *rp)
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{
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/* We now expect two more string. The strings are normalized
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(converted to UPPER case) and stored in the alias database. */
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char *from, *to, *wp;
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while (__isspace_l (*rp, _nl_C_locobj_ptr))
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++rp;
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from = wp = rp;
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while (*rp != '\0' && !__isspace_l (*rp, _nl_C_locobj_ptr))
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*wp++ = __toupper_l (*rp++, _nl_C_locobj_ptr);
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if (*rp == '\0')
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/* There is no `to' string on the line. Ignore it. */
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return;
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*wp++ = '\0';
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to = ++rp;
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while (__isspace_l (*rp, _nl_C_locobj_ptr))
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++rp;
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while (*rp != '\0' && !__isspace_l (*rp, _nl_C_locobj_ptr))
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*wp++ = __toupper_l (*rp++, _nl_C_locobj_ptr);
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if (to == wp)
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/* No `to' string, ignore the line. */
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return;
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*wp++ = '\0';
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add_alias2 (from, to, wp);
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}
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/* Insert a data structure for a new module in the search tree. */
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static void
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insert_module (struct gconv_module *newp, int tobefreed)
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{
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struct gconv_module **rootp = &__gconv_modules_db;
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while (*rootp != NULL)
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{
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struct gconv_module *root = *rootp;
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int cmpres;
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cmpres = strcmp (newp->from_string, root->from_string);
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if (cmpres == 0)
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{
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/* Both strings are identical. Insert the string at the
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end of the `same' list if it is not already there. */
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while (strcmp (newp->from_string, root->from_string) != 0
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|| strcmp (newp->to_string, root->to_string) != 0)
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{
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rootp = &root->same;
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root = *rootp;
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if (root == NULL)
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break;
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}
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if (root != NULL)
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{
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/* This is a no new conversion. But maybe the cost is
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better. */
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if (newp->cost_hi < root->cost_hi
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|| (newp->cost_hi == root->cost_hi
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&& newp->cost_lo < root->cost_lo))
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{
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newp->left = root->left;
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newp->right = root->right;
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newp->same = root->same;
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*rootp = newp;
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free (root);
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}
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else if (tobefreed)
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free (newp);
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return;
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}
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break;
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}
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else if (cmpres < 0)
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rootp = &root->left;
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else
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rootp = &root->right;
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}
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/* Plug in the new node here. */
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*rootp = newp;
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}
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/* Add new module. */
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static void
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add_module (char *rp, const char *directory, size_t dir_len, int modcounter)
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{
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/* We expect now
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1. `from' name
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2. `to' name
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3. filename of the module
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4. an optional cost value
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*/
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struct gconv_alias fake_alias;
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struct gconv_module *new_module;
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char *from, *to, *module, *wp;
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int need_ext;
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int cost_hi;
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while (__isspace_l (*rp, _nl_C_locobj_ptr))
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++rp;
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from = rp;
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while (*rp != '\0' && !__isspace_l (*rp, _nl_C_locobj_ptr))
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{
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*rp = __toupper_l (*rp, _nl_C_locobj_ptr);
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++rp;
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}
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if (*rp == '\0')
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return;
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*rp++ = '\0';
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to = wp = rp;
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while (__isspace_l (*rp, _nl_C_locobj_ptr))
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++rp;
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while (*rp != '\0' && !__isspace_l (*rp, _nl_C_locobj_ptr))
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*wp++ = __toupper_l (*rp++, _nl_C_locobj_ptr);
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if (*rp == '\0')
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return;
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*wp++ = '\0';
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do
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++rp;
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while (__isspace_l (*rp, _nl_C_locobj_ptr));
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module = wp;
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while (*rp != '\0' && !__isspace_l (*rp, _nl_C_locobj_ptr))
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*wp++ = *rp++;
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if (*rp == '\0')
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{
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/* There is no cost, use one by default. */
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*wp++ = '\0';
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cost_hi = 1;
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}
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else
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{
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/* There might be a cost value. */
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char *endp;
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*wp++ = '\0';
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cost_hi = strtol (rp, &endp, 10);
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if (rp == endp || cost_hi < 1)
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/* No useful information. */
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cost_hi = 1;
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}
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if (module[0] == '\0')
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/* No module name given. */
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return;
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if (module[0] == '/')
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dir_len = 0;
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/* See whether we must add the ending. */
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need_ext = 0;
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if (wp - module < (ptrdiff_t) sizeof (gconv_module_ext)
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|| memcmp (wp - sizeof (gconv_module_ext), gconv_module_ext,
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sizeof (gconv_module_ext)) != 0)
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/* We must add the module extension. */
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need_ext = sizeof (gconv_module_ext) - 1;
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/* See whether we have already an alias with this name defined. */
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fake_alias.fromname = strndupa (from, to - from);
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if (__tfind (&fake_alias, &__gconv_alias_db, __gconv_alias_compare) != NULL)
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/* This module duplicates an alias. */
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return;
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new_module = (struct gconv_module *) calloc (1,
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sizeof (struct gconv_module)
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+ (wp - from)
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+ dir_len + need_ext);
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if (new_module != NULL)
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{
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char *tmp;
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new_module->from_string = tmp = (char *) (new_module + 1);
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tmp = __mempcpy (tmp, from, to - from);
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new_module->to_string = tmp;
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tmp = __mempcpy (tmp, to, module - to);
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new_module->cost_hi = cost_hi;
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new_module->cost_lo = modcounter;
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new_module->module_name = tmp;
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if (dir_len != 0)
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tmp = __mempcpy (tmp, directory, dir_len);
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tmp = __mempcpy (tmp, module, wp - module);
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if (need_ext)
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memcpy (tmp - 1, gconv_module_ext, sizeof (gconv_module_ext));
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/* Now insert the new module data structure in our search tree. */
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insert_module (new_module, 1);
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}
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}
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/* Determine the directories we are looking for data in. This function should
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only be called from __gconv_read_conf. */
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static void
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__gconv_get_path (void)
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{
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struct path_elem *result;
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/* This function is only ever called when __gconv_path_elem is NULL. */
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result = __gconv_path_elem;
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assert (result == NULL);
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/* Determine the complete path first. */
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char *gconv_path;
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size_t gconv_path_len;
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char *elem;
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char *oldp;
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char *cp;
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int nelems;
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char *cwd;
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size_t cwdlen;
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if (__gconv_path_envvar == NULL)
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{
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/* No user-defined path. Make a modifiable copy of the
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default path. */
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gconv_path = strdupa (default_gconv_path);
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gconv_path_len = sizeof (default_gconv_path);
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cwd = NULL;
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cwdlen = 0;
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}
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else
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{
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/* Append the default path to the user-defined path. */
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size_t user_len = strlen (__gconv_path_envvar);
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gconv_path_len = user_len + 1 + sizeof (default_gconv_path);
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gconv_path = alloca (gconv_path_len);
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__mempcpy (__mempcpy (__mempcpy (gconv_path, __gconv_path_envvar,
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user_len),
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":", 1),
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default_gconv_path, sizeof (default_gconv_path));
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cwd = __getcwd (NULL, 0);
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cwdlen = __glibc_unlikely (cwd == NULL) ? 0 : strlen (cwd);
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}
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assert (default_gconv_path[0] == '/');
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/* In a first pass we calculate the number of elements. */
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oldp = NULL;
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cp = strchr (gconv_path, ':');
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nelems = 1;
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while (cp != NULL)
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{
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if (cp != oldp + 1)
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++nelems;
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oldp = cp;
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cp = strchr (cp + 1, ':');
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}
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/* Allocate the memory for the result. */
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result = malloc ((nelems + 1)
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* sizeof (struct path_elem)
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+ gconv_path_len + nelems
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+ (nelems - 1) * (cwdlen + 1));
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if (result != NULL)
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{
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char *strspace = (char *) &result[nelems + 1];
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int n = 0;
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/* Separate the individual parts. */
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__gconv_max_path_elem_len = 0;
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elem = __strtok_r (gconv_path, ":", &gconv_path);
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assert (elem != NULL);
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do
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{
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result[n].name = strspace;
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if (elem[0] != '/')
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{
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assert (cwd != NULL);
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strspace = __mempcpy (strspace, cwd, cwdlen);
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*strspace++ = '/';
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}
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strspace = __stpcpy (strspace, elem);
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if (strspace[-1] != '/')
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*strspace++ = '/';
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result[n].len = strspace - result[n].name;
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if (result[n].len > __gconv_max_path_elem_len)
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__gconv_max_path_elem_len = result[n].len;
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*strspace++ = '\0';
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++n;
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}
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while ((elem = __strtok_r (NULL, ":", &gconv_path)) != NULL);
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result[n].name = NULL;
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result[n].len = 0;
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}
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__gconv_path_elem = result ?: (struct path_elem *) &empty_path_elem;
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free (cwd);
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}
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/* Read all configuration files found in the user-specified and the default
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path. This function should only be called once during the program's
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lifetime. It disregards locking and synchronization because its only
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caller, __gconv_load_conf, handles this. */
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static void
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__gconv_read_conf (void)
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{
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int save_errno = errno;
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size_t cnt;
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/* First see whether we should use the cache. */
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if (__gconv_load_cache () == 0)
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{
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/* Yes, we are done. */
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__set_errno (save_errno);
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return;
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}
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#ifndef STATIC_GCONV
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/* Find out where we have to look. */
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__gconv_get_path ();
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for (cnt = 0; __gconv_path_elem[cnt].name != NULL; ++cnt)
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gconv_parseconfdir (NULL, __gconv_path_elem[cnt].name,
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__gconv_path_elem[cnt].len);
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#endif
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/* Add the internal modules. */
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for (cnt = 0; cnt < sizeof (builtin_modules) / sizeof (builtin_modules[0]);
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++cnt)
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{
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struct gconv_alias fake_alias;
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fake_alias.fromname = (char *) builtin_modules[cnt].from_string;
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if (__tfind (&fake_alias, &__gconv_alias_db, __gconv_alias_compare)
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!= NULL)
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/* It'll conflict so don't add it. */
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continue;
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insert_module (&builtin_modules[cnt], 0);
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}
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/* Add aliases for builtin conversions. */
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const char *cp = builtin_aliases;
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do
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{
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const char *from = cp;
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const char *to = strchr (from, '\0') + 1;
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cp = strchr (to, '\0') + 1;
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add_alias2 (from, to, cp);
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}
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while (*cp != '\0');
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/* Restore the error number. */
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__set_errno (save_errno);
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}
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/* This "once" variable is used to do a one-time load of the configuration. */
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__libc_once_define (static, once);
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/* Read all configuration files found in the user-specified and the default
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path, but do it only "once" using __gconv_read_conf to do the actual
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work. This is the function that must be called when reading iconv
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configuration. */
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void
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__gconv_load_conf (void)
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{
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__libc_once (once, __gconv_read_conf);
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}
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/* Free all resources if necessary. */
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void
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__gconv_conf_freemem (void)
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{
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|
if (__gconv_path_elem != NULL && __gconv_path_elem != &empty_path_elem)
|
|
free ((void *) __gconv_path_elem);
|
|
}
|