/* Provide access to the collection of available transformation modules.
- Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1997-2003, 2004, 2005, 2006, 2007
+ Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ 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
- Library General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+#include <assert.h>
#include <limits.h>
#include <search.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <bits/libc-lock.h>
+#include <locale/localeinfo.h>
#include <dlfcn.h>
#include <gconv_int.h>
+#include <sysdep.h>
/* Simple data structure for alias mapping. We have two names, `from'
struct gconv_module *__gconv_modules_db;
/* We modify global data. */
-__libc_lock_define_initialized (static, lock)
+__libc_lock_define_initialized (, __gconv_lock)
+
+
+/* Provide access to module database. */
+struct gconv_module *
+__gconv_get_modules_db (void)
+{
+ return __gconv_modules_db;
+}
+
+void *
+__gconv_get_alias_db (void)
+{
+ return __gconv_alias_db;
+}
/* Function for searching alias. */
int
__gconv_alias_compare (const void *p1, const void *p2)
{
- struct gconv_alias *s1 = (struct gconv_alias *) p1;
- struct gconv_alias *s2 = (struct gconv_alias *) p2;
+ const struct gconv_alias *s1 = (const struct gconv_alias *) p1;
+ const struct gconv_alias *s2 = (const struct gconv_alias *) p2;
return strcmp (s1->fromname, s2->fromname);
}
static int
derivation_compare (const void *p1, const void *p2)
{
- struct known_derivation *s1 = (struct known_derivation *) p1;
- struct known_derivation *s2 = (struct known_derivation *) p2;
+ const struct known_derivation *s1 = (const struct known_derivation *) p1;
+ const struct known_derivation *s2 = (const struct known_derivation *) p2;
int result;
result = strcmp (s1->from, s2->from);
not all memory will be freed. */
}
-static void
+static void __libc_freeres_fn_section
free_derivation (void *p)
{
struct known_derivation *deriv = (struct known_derivation *) p;
size_t cnt;
for (cnt = 0; cnt < deriv->nsteps; ++cnt)
- if (deriv->steps[cnt].__end_fct)
- DL_CALL_FCT (deriv->steps[cnt].__end_fct, (&deriv->steps[cnt]));
+ if (deriv->steps[cnt].__counter > 0
+ && deriv->steps[cnt].__end_fct != NULL)
+ {
+ assert (deriv->steps[cnt].__shlib_handle != NULL);
+
+ __gconv_end_fct end_fct = deriv->steps[cnt].__end_fct;
+#ifdef PTR_DEMANGLE
+ PTR_DEMANGLE (end_fct);
+#endif
+ DL_CALL_FCT (end_fct, (&deriv->steps[cnt]));
+ }
/* Free the name strings. */
free ((char *) deriv->steps[0].__from_name);
}
+/* Decrement the reference count for a single step in a steps array. */
+void
+internal_function
+__gconv_release_step (struct __gconv_step *step)
+{
+ /* Skip builtin modules; they are not reference counted. */
+ if (step->__shlib_handle != NULL && --step->__counter == 0)
+ {
+ /* Call the destructor. */
+ if (step->__end_fct != NULL)
+ {
+ assert (step->__shlib_handle != NULL);
+
+ __gconv_end_fct end_fct = step->__end_fct;
+#ifdef PTR_DEMANGLE
+ PTR_DEMANGLE (end_fct);
+#endif
+ DL_CALL_FCT (end_fct, (step));
+ }
+
+#ifndef STATIC_GCONV
+ /* Release the loaded module. */
+ __gconv_release_shlib (step->__shlib_handle);
+ step->__shlib_handle = NULL;
+#endif
+ }
+ else if (step->__shlib_handle == NULL)
+ /* Builtin modules should not have end functions. */
+ assert (step->__end_fct == NULL);
+}
+
static int
internal_function
gen_steps (struct derivation_step *best, const char *toset,
{
result[step_cnt].__from_name = (step_cnt == 0
? __strdup (fromset)
- : current->last->result_set);
+ : (char *)current->last->result_set);
result[step_cnt].__to_name = (step_cnt + 1 == *nsteps
? __strdup (current->result_set)
: result[step_cnt + 1].__from_name);
+ result[step_cnt].__counter = 1;
+ result[step_cnt].__data = NULL;
+
#ifndef STATIC_GCONV
if (current->code->module_name[0] == '/')
{
result[step_cnt].__shlib_handle = shlib_handle;
result[step_cnt].__modname = shlib_handle->name;
- result[step_cnt].__counter = 1;
result[step_cnt].__fct = shlib_handle->fct;
result[step_cnt].__init_fct = shlib_handle->init_fct;
result[step_cnt].__end_fct = shlib_handle->end_fct;
+
+ /* These settings can be overridden by the init function. */
+ result[step_cnt].__btowc_fct = NULL;
+
+ /* Call the init function. */
+ __gconv_init_fct init_fct = result[step_cnt].__init_fct;
+ if (init_fct != NULL)
+ {
+ assert (result[step_cnt].__shlib_handle != NULL);
+
+# ifdef PTR_DEMANGLE
+ PTR_DEMANGLE (init_fct);
+# endif
+ status = DL_CALL_FCT (init_fct, (&result[step_cnt]));
+
+ if (__builtin_expect (status, __GCONV_OK) != __GCONV_OK)
+ {
+ failed = 1;
+ /* Make sure we unload this modules. */
+ --step_cnt;
+ result[step_cnt].__end_fct = NULL;
+ break;
+ }
+
+# ifdef PTR_MANGLE
+ if (result[step_cnt].__btowc_fct != NULL)
+ PTR_MANGLE (result[step_cnt].__btowc_fct);
+# endif
+ }
}
else
#endif
__gconv_get_builtin_trans (current->code->module_name,
&result[step_cnt]);
- /* Call the init function. */
- result[step_cnt].__data = NULL;
- if (result[step_cnt].__init_fct != NULL)
- {
- status = DL_CALL_FCT (result[step_cnt].__init_fct,
- (&result[step_cnt]));
-
- if (__builtin_expect (status, __GCONV_OK) != __GCONV_OK)
- {
- failed = 1;
- /* Make sure we unload this modules. */
- --step_cnt;
- break;
- }
- }
-
current = current->last;
}
{
/* Something went wrong while initializing the modules. */
while (++step_cnt < *nsteps)
- {
- if (result[step_cnt].__end_fct != NULL)
- DL_CALL_FCT (result[step_cnt].__end_fct, (&result[step_cnt]));
-#ifndef STATIC_GCONV
- __gconv_release_shlib (result[step_cnt].__shlib_handle);
-#endif
- }
+ __gconv_release_step (&result[step_cnt]);
free (result);
*nsteps = 0;
*handle = NULL;
int result = __GCONV_OK;
while (cnt-- > 0)
- if (steps[cnt].__counter++ == 0)
- {
- steps[cnt].__shlib_handle =
- __gconv_find_shlib (steps[cnt].__modname);
- if (steps[cnt].__shlib_handle == NULL)
- {
- /* Oops, this is the second time we use this module (after
- unloading) and this time loading failed!? */
- while (++cnt < nsteps)
- __gconv_release_shlib (steps[cnt].__shlib_handle);
- result = __GCONV_NOCONV;
- break;
- }
- }
+ {
+ struct __gconv_step *step = &steps[cnt];
+
+ if (step->__counter++ == 0)
+ {
+ /* Skip builtin modules. */
+ if (step->__modname != NULL)
+ {
+ /* Reopen a previously used module. */
+ step->__shlib_handle = __gconv_find_shlib (step->__modname);
+ if (step->__shlib_handle == NULL)
+ {
+ /* Oops, this is the second time we use this module
+ (after unloading) and this time loading failed!? */
+ --step->__counter;
+ while (++cnt < nsteps)
+ __gconv_release_step (&steps[cnt]);
+ result = __GCONV_NOCONV;
+ break;
+ }
+
+ /* The function addresses defined by the module may
+ have changed. */
+ step->__fct = step->__shlib_handle->fct;
+ step->__init_fct = step->__shlib_handle->init_fct;
+ step->__end_fct = step->__shlib_handle->end_fct;
+
+ /* These settings can be overridden by the init function. */
+ step->__btowc_fct = NULL;
+ }
+
+ /* Call the init function. */
+ __gconv_init_fct init_fct = step->__init_fct;
+ if (init_fct != NULL)
+ {
+#ifdef PTR_DEMANGLE
+ PTR_DEMANGLE (init_fct);
+#endif
+ DL_CALL_FCT (init_fct, (step));
+
+#ifdef PTR_MANGLE
+ if (step->__btowc_fct != NULL)
+ PTR_MANGLE (step->__btowc_fct);
+#endif
+ }
+ }
+ }
return result;
}
#endif
int best_cost_lo = INT_MAX;
int result;
- /* There is a small chance that this derivation is meanwhile found. This
- can happen if in `find_derivation' we look for this derivation, didn't
- find it but at the same time another thread looked for this derivation. */
+ /* Look whether an earlier call to `find_derivation' has already
+ computed a possible derivation. If so, return it immediately. */
result = derivation_lookup (fromset_expand ?: fromset, toset_expand ?: toset,
handle, nsteps);
if (result == __GCONV_OK)
return result;
}
- /* For now we use a simple algorithm with quadratic runtime behaviour.
- The task is to match the `toset' with any of the available rules,
- starting from FROMSET. */
+ /* The task is to find a sequence of transformations, backed by the
+ existing modules - whether builtin or dynamically loadable -,
+ starting at `fromset' (or `fromset_expand') and ending at `toset'
+ (or `toset_expand'), and with minimal cost.
+
+ For computer scientists, this is a shortest path search in the
+ graph where the nodes are all possible charsets and the edges are
+ the transformations listed in __gconv_modules_db.
+
+ For now we use a simple algorithm with quadratic runtime behaviour.
+ A breadth-first search, starting at `fromset' and `fromset_expand'.
+ The list starting at `first' contains all nodes that have been
+ visited up to now, in the order in which they have been visited --
+ excluding the goal nodes `toset' and `toset_expand' which get
+ managed in the list starting at `solution'.
+ `current' walks through the list starting at `first' and looks
+ which nodes are reachable from the current node, adding them to
+ the end of the list [`first' or `solution' respectively] (if
+ they are visited the first time) or updating them in place (if
+ they have have already been visited).
+ In each node of either list, cost_lo and cost_hi contain the
+ minimum cost over any paths found up to now, starting at `fromset'
+ or `fromset_expand', ending at that node. best_cost_lo and
+ best_cost_hi represent the minimum over the elements of the
+ `solution' list. */
+
if (fromset_expand != NULL)
{
first = NEW_STEP (fromset_expand, 0, 0, NULL, NULL);
searching for prefixes. So we search for the first entry with a
matching prefix and any other matching entry can be found from
this place. */
- struct gconv_module *node = __gconv_modules_db;
+ struct gconv_module *node;
/* Maybe it is not necessary anymore to look for a solution for
- this entry since the cost is already as high (or heigher) as
+ this entry since the cost is already as high (or higher) as
the cost for the best solution so far. */
if (current->cost_hi > best_cost_hi
|| (current->cost_hi == best_cost_hi
&& current->cost_lo >= best_cost_lo))
continue;
+ node = __gconv_modules_db;
while (node != NULL)
{
int cmpres = strcmp (current->result_set, node->from_string);
struct derivation_step *step;
/* We managed to find a derivation. First see whether
- this is what we are looking for. */
+ we have reached one of the goal nodes. */
if (strcmp (result_set, toset) == 0
|| (toset_expand != NULL
&& strcmp (result_set, toset_expand) == 0))
{
- if (solution == NULL || cost_hi < best_cost_hi
+ /* Append to the `solution' list if there
+ is no entry with this name. */
+ for (step = solution; step != NULL; step = step->next)
+ if (strcmp (result_set, step->result_set) == 0)
+ break;
+
+ if (step == NULL)
+ {
+ step = NEW_STEP (result_set,
+ cost_hi, cost_lo,
+ runp, current);
+ step->next = solution;
+ solution = step;
+ }
+ else if (step->cost_hi > cost_hi
+ || (step->cost_hi == cost_hi
+ && step->cost_lo > cost_lo))
+ {
+ /* A better path was found for the node,
+ on the `solution' list. */
+ step->code = runp;
+ step->last = current;
+ step->cost_hi = cost_hi;
+ step->cost_lo = cost_lo;
+ }
+
+ /* Update best_cost accordingly. */
+ if (cost_hi < best_cost_hi
|| (cost_hi == best_cost_hi
&& cost_lo < best_cost_lo))
{
best_cost_hi = cost_hi;
best_cost_lo = cost_lo;
}
-
- /* Append this solution to list. */
- if (solution == NULL)
- solution = NEW_STEP (result_set, 0, 0, runp, current);
- else
- {
- while (solution->next != NULL)
- solution = solution->next;
-
- solution->next = NEW_STEP (result_set, 0, 0,
- runp, current);
- }
}
else if (cost_hi < best_cost_hi
|| (cost_hi == best_cost_hi
&& cost_lo < best_cost_lo))
{
- /* Append at the end if there is no entry with
- this name. */
+ /* Append at the end of the `first' list if there
+ is no entry with this name. */
for (step = first; step != NULL; step = step->next)
if (strcmp (result_set, step->result_set) == 0)
break;
|| (step->cost_hi == cost_hi
&& step->cost_lo > cost_lo))
{
+ /* A better path was found for the node,
+ on the `first' list. */
step->code = runp;
step->last = current;
/* Update the cost for all steps. */
for (step = first; step != NULL;
step = step->next)
- {
- struct derivation_step *back;
-
- if (step->code == NULL)
- /* This is one of the entries we started
- from. */
- continue;
-
- step->cost_hi = step->code->cost_hi;
- step->cost_lo = step->code->cost_lo;
-
- for (back = step->last; back->code != NULL;
- back = back->last)
- {
- step->cost_hi += back->code->cost_hi;
- step->cost_lo += back->code->cost_lo;
- }
- }
-
+ /* But don't update the start nodes. */
+ if (step->code != NULL)
+ {
+ struct derivation_step *back;
+ int hi, lo;
+
+ hi = step->code->cost_hi;
+ lo = step->code->cost_lo;
+
+ for (back = step->last; back->code != NULL;
+ back = back->last)
+ {
+ hi += back->code->cost_hi;
+ lo += back->code->cost_lo;
+ }
+
+ step->cost_hi = hi;
+ step->cost_lo = lo;
+ }
+
+ /* Likewise for the nodes on the solution list.
+ Also update best_cost accordingly. */
for (step = solution; step != NULL;
step = step->next)
{
|| (step->cost_hi == best_cost_hi
&& step->cost_lo < best_cost_lo))
{
- solution = step;
best_cost_hi = step->cost_hi;
best_cost_lo = step->cost_lo;
}
}
if (solution != NULL)
- /* We really found a way to do the transformation. Now build a data
- structure describing the transformation steps.*/
- result = gen_steps (solution, toset_expand ?: toset,
- fromset_expand ?: fromset, handle, nsteps);
+ {
+ /* We really found a way to do the transformation. */
+
+ /* Choose the best solution. This is easy because we know that
+ the solution list has at most length 2 (one for every possible
+ goal node). */
+ if (solution->next != NULL)
+ {
+ struct derivation_step *solution2 = solution->next;
+
+ if (solution2->cost_hi < solution->cost_hi
+ || (solution2->cost_hi == solution->cost_hi
+ && solution2->cost_lo < solution->cost_lo))
+ solution = solution2;
+ }
+
+ /* Now build a data structure describing the transformation steps. */
+ result = gen_steps (solution, toset_expand ?: toset,
+ fromset_expand ?: fromset, handle, nsteps);
+ }
else
{
/* We haven't found a transformation. Clear the result values. */
}
+/* Control of initialization. */
+__libc_once_define (static, once);
+
+
+static const char *
+do_lookup_alias (const char *name)
+{
+ struct gconv_alias key;
+ struct gconv_alias **found;
+
+ key.fromname = (char *) name;
+ found = __tfind (&key, &__gconv_alias_db, __gconv_alias_compare);
+ return found != NULL ? (*found)->toname : NULL;
+}
+
+
+int
+internal_function
+__gconv_compare_alias (const char *name1, const char *name2)
+{
+ int result;
+
+ /* Ensure that the configuration data is read. */
+ __libc_once (once, __gconv_read_conf);
+
+ if (__gconv_compare_alias_cache (name1, name2, &result) != 0)
+ result = strcmp (do_lookup_alias (name1) ?: name1,
+ do_lookup_alias (name2) ?: name2);
+
+ return result;
+}
+
+
int
internal_function
__gconv_find_transform (const char *toset, const char *fromset,
struct __gconv_step **handle, size_t *nsteps,
int flags)
{
- __libc_once_define (static, once);
- const char *fromset_expand = NULL;
- const char *toset_expand = NULL;
+ const char *fromset_expand;
+ const char *toset_expand;
int result;
/* Ensure that the configuration data is read. */
__libc_once (once, __gconv_read_conf);
/* Acquire the lock. */
- __libc_lock_lock (lock);
+ __libc_lock_lock (__gconv_lock);
+
+ result = __gconv_lookup_cache (toset, fromset, handle, nsteps, flags);
+ if (result != __GCONV_NODB)
+ {
+ /* We have a cache and could resolve the request, successful or not. */
+ __libc_lock_unlock (__gconv_lock);
+ return result;
+ }
/* If we don't have a module database return with an error. */
if (__gconv_modules_db == NULL)
{
- __libc_lock_unlock (lock);
+ __libc_lock_unlock (__gconv_lock);
return __GCONV_NOCONV;
}
/* See whether the names are aliases. */
- if (__gconv_alias_db != NULL)
- {
- struct gconv_alias key;
- struct gconv_alias **found;
-
- key.fromname = fromset;
- found = __tfind (&key, &__gconv_alias_db, __gconv_alias_compare);
- fromset_expand = found != NULL ? (*found)->toname : NULL;
-
- key.fromname = toset;
- found = __tfind (&key, &__gconv_alias_db, __gconv_alias_compare);
- toset_expand = found != NULL ? (*found)->toname : NULL;
- }
+ fromset_expand = do_lookup_alias (fromset);
+ toset_expand = do_lookup_alias (toset);
if (__builtin_expect (flags & GCONV_AVOID_NOCONV, 0)
/* We are not supposed to create a pseudo transformation (means
&& strcmp (toset_expand, fromset_expand) == 0)))))
{
/* Both character sets are the same. */
- __libc_lock_unlock (lock);
- return __GCONV_NOCONV;
+ __libc_lock_unlock (__gconv_lock);
+ return __GCONV_NULCONV;
}
result = find_derivation (toset, toset_expand, fromset, fromset_expand,
handle, nsteps);
/* Release the lock. */
- __libc_lock_unlock (lock);
+ __libc_lock_unlock (__gconv_lock);
/* The following code is necessary since `find_derivation' will return
GCONV_OK even when no derivation was found but the same request
__gconv_close_transform (struct __gconv_step *steps, size_t nsteps)
{
int result = __GCONV_OK;
+ size_t cnt;
-#ifndef STATIC_GCONV
/* Acquire the lock. */
- __libc_lock_lock (lock);
+ __libc_lock_lock (__gconv_lock);
- while (nsteps-- > 0)
- if (steps[nsteps].__shlib_handle != NULL
- && --steps[nsteps].__counter == 0)
- {
- result = __gconv_release_shlib (steps[nsteps].__shlib_handle);
- if (result != __GCONV_OK)
- break;
- steps[nsteps].__shlib_handle = NULL;
- }
+#ifndef STATIC_GCONV
+ cnt = nsteps;
+ while (cnt-- > 0)
+ __gconv_release_step (&steps[cnt]);
+#endif
+
+ /* If we use the cache we free a bit more since we don't keep any
+ transformation records around, they are cheap enough to
+ recreate. */
+ __gconv_release_cache (steps, nsteps);
/* Release the lock. */
- __libc_lock_unlock (lock);
-#endif
+ __libc_lock_unlock (__gconv_lock);
return result;
}
/* Free the modules mentioned. */
static void
-internal_function
+internal_function __libc_freeres_fn_section
free_modules_db (struct gconv_module *node)
{
if (node->left != NULL)
/* Free all resources if necessary. */
-static void __attribute__ ((unused))
-free_mem (void)
+libc_freeres_fn (free_mem)
{
+ /* First free locale memory. This needs to be done before freeing derivations,
+ as ctype cleanup functions dereference steps arrays which we free below. */
+ _nl_locale_subfreeres ();
+
+ /* finddomain.c has similar problem. */
+ extern void _nl_finddomain_subfreeres (void) attribute_hidden;
+ _nl_finddomain_subfreeres ();
+
if (__gconv_alias_db != NULL)
__tdestroy (__gconv_alias_db, free);
if (known_derivations != NULL)
__tdestroy (known_derivations, free_derivation);
}
-
-text_set_element (__libc_subfreeres, free_mem);
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