/* Provide access to the collection of available transformation modules.
- Copyright (C) 1997 Free Software Foundation, Inc.
+ Copyright (C) 1997-2019 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, see
+ <https://www.gnu.org/licenses/>. */
-#include <gconv.h>
+#include <assert.h>
+#include <limits.h>
#include <search.h>
#include <stdlib.h>
#include <string.h>
-#include <bits/libc-lock.h>
+#include <sys/param.h>
+#include <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'
void *__gconv_alias_db;
/* Array with available modules. */
-size_t __gconv_nmodules;
-struct gconv_module **__gconv_modules_db;
+struct gconv_module *__gconv_modules_db;
+
+/* We modify global data. */
+__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;
- return __strcasecmp (s1->fromname, s2->fromname);
+ 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);
}
struct derivation_step
{
const char *result_set;
+ size_t result_set_len;
+ int cost_lo;
+ int cost_hi;
struct gconv_module *code;
struct derivation_step *last;
struct derivation_step *next;
};
-#define NEW_STEP(result, module, last_mod) \
+#define NEW_STEP(result, hi, lo, module, last_mod) \
({ struct derivation_step *newp = alloca (sizeof (struct derivation_step)); \
newp->result_set = result; \
+ newp->result_set_len = strlen (result); \
+ newp->cost_hi = hi; \
+ newp->cost_lo = lo; \
newp->code = module; \
newp->last = last_mod; \
newp->next = NULL; \
{
const char *from;
const char *to;
- struct gconv_step *steps;
+ struct __gconv_step *steps;
size_t nsteps;
};
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);
/* Look up whether given transformation was already requested before. */
static int
derivation_lookup (const char *fromset, const char *toset,
- struct gconv_step **handle, size_t *nsteps)
+ struct __gconv_step **handle, size_t *nsteps)
{
struct known_derivation key = { fromset, toset, NULL, 0 };
- struct known_derivation *result;
+ struct known_derivation **result;
result = __tfind (&key, &known_derivations, derivation_compare);
if (result == NULL)
- return GCONV_NOCONV;
+ return __GCONV_NOCONV;
- *handle = result->steps;
- *nsteps = result->nsteps;
+ *handle = (*result)->steps;
+ *nsteps = (*result)->nsteps;
/* Please note that we return GCONV_OK even if the last search for
this transformation was unsuccessful. */
- return GCONV_OK;
+ return __GCONV_OK;
}
/* Add new derivation to list of known ones. */
static void
add_derivation (const char *fromset, const char *toset,
- struct gconv_step *handle, size_t nsteps)
+ struct __gconv_step *handle, size_t nsteps)
{
struct known_derivation *new_deriv;
size_t fromset_len = strlen (fromset) + 1;
malloc (sizeof (struct known_derivation) + fromset_len + toset_len);
if (new_deriv != NULL)
{
- new_deriv->from = memcpy ((char *) new_deriv
- + sizeof (struct known_derivation),
- fromset, fromset_len);
- new_deriv->to = memcpy ((char *) new_deriv->from + fromset_len,
+ new_deriv->from = (char *) (new_deriv + 1);
+ new_deriv->to = memcpy (__mempcpy (new_deriv + 1, fromset, fromset_len),
toset, toset_len);
new_deriv->steps = handle;
new_deriv->nsteps = nsteps;
- __tsearch (new_deriv, &known_derivations, derivation_compare);
+ if (__tsearch (new_deriv, &known_derivations, derivation_compare)
+ == NULL)
+ /* There is some kind of memory allocation problem. */
+ free (new_deriv);
}
/* Please note that we don't complain if the allocation failed. This
is not tragically but in case we use the memory debugging facilities
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].__counter > 0
+ && deriv->steps[cnt].__shlib_handle != NULL)
+ {
+ __gconv_end_fct end_fct = deriv->steps[cnt].__end_fct;
+#ifdef PTR_DEMANGLE
+ PTR_DEMANGLE (end_fct);
+#endif
+ if (end_fct != NULL)
+ DL_CALL_FCT (end_fct, (&deriv->steps[cnt]));
+ }
+
+ /* Free the name strings. */
+ if (deriv->steps != NULL)
+ {
+ free ((char *) deriv->steps[0].__from_name);
+ free ((char *) deriv->steps[deriv->nsteps - 1].__to_name);
+ free ((struct __gconv_step *) deriv->steps);
+ }
- free ((struct gconv_step *) deriv->steps);
free (deriv);
}
+/* Decrement the reference count for a single step in a steps array. */
+void
+__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. */
+ __gconv_end_fct end_fct = step->__end_fct;
+#ifdef PTR_DEMANGLE
+ PTR_DEMANGLE (end_fct);
+#endif
+ if (end_fct != NULL)
+ 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,
- const char *fromset, struct gconv_step **handle, size_t *nsteps)
+ const char *fromset, struct __gconv_step **handle, size_t *nsteps)
{
size_t step_cnt = 0;
- struct gconv_step *result;
+ struct __gconv_step *result;
struct derivation_step *current;
- int status = GCONV_NOMEM;
+ int status = __GCONV_NOMEM;
+ char *from_name = NULL;
+ char *to_name = NULL;
/* First determine number of steps. */
for (current = best; current->last != NULL; current = current->last)
++step_cnt;
- result = (struct gconv_step *) malloc (sizeof (struct gconv_step)
- * step_cnt);
+ result = (struct __gconv_step *) malloc (sizeof (struct __gconv_step)
+ * step_cnt);
if (result != NULL)
{
int failed = 0;
+ status = __GCONV_OK;
*nsteps = step_cnt;
current = best;
while (step_cnt-- > 0)
{
- result[step_cnt].from_name = (step_cnt == 0
- ? __strdup (fromset)
- : current->last->result_set);
- result[step_cnt].to_name = (step_cnt + 1 == *nsteps
- ? __strdup (current->result_set)
- : result[step_cnt + 1].from_name);
+ if (step_cnt == 0)
+ {
+ result[step_cnt].__from_name = from_name = __strdup (fromset);
+ if (from_name == NULL)
+ {
+ failed = 1;
+ break;
+ }
+ }
+ else
+ result[step_cnt].__from_name = (char *)current->last->result_set;
+
+ if (step_cnt + 1 == *nsteps)
+ {
+ result[step_cnt].__to_name = to_name
+ = __strdup (current->result_set);
+ if (to_name == NULL)
+ {
+ failed = 1;
+ break;
+ }
+ }
+ else
+ result[step_cnt].__to_name = 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] == '/')
{
/* Load the module, return handle for it. */
- void *shlib_handle =
+ struct __gconv_loaded_object *shlib_handle =
__gconv_find_shlib (current->code->module_name);
if (shlib_handle == NULL)
break;
}
- result[step_cnt].shlib_handle = shlib_handle;
-
- result[step_cnt].fct = __gconv_find_func (shlib_handle, "gconv");
- if (result[step_cnt].fct == NULL)
+ result[step_cnt].__shlib_handle = shlib_handle;
+ result[step_cnt].__modname = shlib_handle->name;
+ 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;
+# ifdef PTR_DEMANGLE
+ PTR_DEMANGLE (init_fct);
+# endif
+ if (init_fct != NULL)
{
- /* Argh, no conversion function. There is something
- wrong here. */
- __gconv_release_shlib (result[step_cnt].shlib_handle);
- failed = 1;
- break;
- }
+ status = DL_CALL_FCT (init_fct, (&result[step_cnt]));
- result[step_cnt].init_fct = __gconv_find_func (shlib_handle,
- "gconv_init");
- result[step_cnt].end_fct = __gconv_find_func (shlib_handle,
- "gconv_end");
+ if (__builtin_expect (status, __GCONV_OK) != __GCONV_OK)
+ {
+ failed = 1;
+ /* Do not call the end function because the init
+ function has failed. */
+ result[step_cnt].__end_fct = NULL;
+# ifdef PTR_MANGLE
+ PTR_MANGLE (result[step_cnt].__end_fct);
+# endif
+ /* Make sure we unload this module. */
+ --step_cnt;
+ break;
+ }
+ }
+# ifdef PTR_MANGLE
+ PTR_MANGLE (result[step_cnt].__btowc_fct);
+# endif
}
else
+#endif
/* It's a builtin transformation. */
__gconv_get_builtin_trans (current->code->module_name,
&result[step_cnt]);
current = current->last;
}
- if (failed != 0)
+ if (__builtin_expect (failed, 0) != 0)
{
/* Something went wrong while initializing the modules. */
while (++step_cnt < *nsteps)
- __gconv_release_shlib (result[step_cnt].shlib_handle);
+ __gconv_release_step (&result[step_cnt]);
free (result);
+ free (from_name);
+ free (to_name);
*nsteps = 0;
- status = GCONV_NOCONV;
+ *handle = NULL;
+ if (status == __GCONV_OK)
+ status = __GCONV_NOCONV;
}
else
- {
- *handle = result;
- status = GCONV_OK;
- }
+ *handle = result;
+ }
+ else
+ {
+ *nsteps = 0;
+ *handle = NULL;
}
return status;
}
+#ifndef STATIC_GCONV
+static int
+increment_counter (struct __gconv_step *steps, size_t nsteps)
+{
+ /* Increment the user counter. */
+ size_t cnt = nsteps;
+ int result = __GCONV_OK;
+
+ while (cnt-- > 0)
+ {
+ 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;
+#ifdef PTR_DEMANGLE
+ PTR_DEMANGLE (init_fct);
+#endif
+ if (init_fct != NULL)
+ DL_CALL_FCT (init_fct, (step));
+
+#ifdef PTR_MANGLE
+ PTR_MANGLE (step->__btowc_fct);
+#endif
+ }
+ }
+ }
+ return result;
+}
+#endif
+
+
/* The main function: find a possible derivation from the `fromset' (either
the given name or the alias) to the `toset' (again with alias). */
static int
-internal_function
find_derivation (const char *toset, const char *toset_expand,
const char *fromset, const char *fromset_expand,
- struct gconv_step **handle, size_t *nsteps)
+ struct __gconv_step **handle, size_t *nsteps)
{
- __libc_lock_define_initialized (static, lock)
- struct derivation_step *first, *current, **lastp, *best = NULL;
- int best_cost = 0;
+ struct derivation_step *first, *current, **lastp, *solution = NULL;
+ int best_cost_hi = INT_MAX;
+ int best_cost_lo = INT_MAX;
int result;
+ /* 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;
+ if (result == __GCONV_OK)
+ {
+#ifndef STATIC_GCONV
+ result = increment_counter (*handle, *nsteps);
+#endif
+ return result;
+ }
- __libc_lock_lock (lock);
+ /* 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.
- /* 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. */
- result = derivation_lookup (fromset_expand ?: fromset, toset_expand ?: toset,
- handle, nsteps);
- if (result == GCONV_OK)
- return result;
+ 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.
- /* ### TODO
For now we use a simple algorithm with quadratic runtime behaviour.
- The task is to match the `toset' with any of the available. */
+ 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, NULL, NULL);
- first->next = NEW_STEP (fromset, NULL, NULL);
+ first = NEW_STEP (fromset_expand, 0, 0, NULL, NULL);
+ first->next = NEW_STEP (fromset, 0, 0, NULL, NULL);
lastp = &first->next->next;
}
else
{
- first = NEW_STEP (fromset, NULL, NULL);
+ first = NEW_STEP (fromset, 0, 0, NULL, NULL);
lastp = &first->next;
}
- current = first;
- while (current != NULL)
+ for (current = first; current != NULL; current = current->next)
{
/* Now match all the available module specifications against the
current charset name. If any of them matches check whether
we already have a derivation for this charset. If yes, use the
one with the lower costs. Otherwise add the new charset at the
- end. */
- size_t cnt;
-
- for (cnt = 0; cnt < __gconv_nmodules; ++cnt)
- {
- const char *result_set = NULL;
-
- if (__gconv_modules_db[cnt]->from_pattern == NULL)
+ end.
+
+ The module database is organized in a tree form which allows
+ 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;
+
+ /* Maybe it is not necessary anymore to look for a solution for
+ 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);
+ if (cmpres == 0)
{
- if (__strcasecmp (current->result_set,
- __gconv_modules_db[cnt]->from_constpfx) == 0)
+ /* Walk through the list of modules with this prefix and
+ try to match the name. */
+ struct gconv_module *runp;
+
+ /* Check all the modules with this prefix. */
+ runp = node;
+ do
{
- if (strcmp (__gconv_modules_db[cnt]->to_string, "-") == 0)
- result_set = toset_expand ?: toset;
- else
- result_set = __gconv_modules_db[cnt]->to_string;
- }
- }
- else
- /* We have a regular expression. First see if the prefix
- matches. */
- if (__strncasecmp (current->result_set,
- __gconv_modules_db[cnt]->from_constpfx,
- __gconv_modules_db[cnt]->from_constpfx_len)
- == 0)
- {
- /* First compile the regex if not already done. */
- if (__gconv_modules_db[cnt]->from_regex == NULL)
- {
- regex_t *newp = (regex_t *) malloc (sizeof (regex_t));
-
- if (regcomp (newp, __gconv_modules_db[cnt]->from_pattern,
- REG_EXTENDED | REG_ICASE) != 0)
- {
- /* Something is wrong. Remember this. */
- free (newp);
- __gconv_modules_db[cnt]->from_regex = (regex_t *) -1L;
- }
- else
- __gconv_modules_db[cnt]->from_regex = newp;
- }
-
- if (__gconv_modules_db[cnt]->from_regex != (regex_t *) -1L)
- {
- /* Try to match the from name. */
- regmatch_t match[4];
-
- if (regexec (__gconv_modules_db[cnt]->from_regex,
- current->result_set, 4, match, 0) == 0
- && match[0].rm_so == 0
- && current->result_set[match[0].rm_eo] == '\0')
- {
- /* At least the whole <from> string is matched.
- We must now match sed-like possible
- subexpressions from the match to the
- toset expression. */
-#define ENSURE_LEN(LEN) \
- if (wp + (LEN) >= constr + len - 1) \
- { \
- char *newp = alloca (len += 128); \
- memcpy (newp, constr, wp - constr); \
- wp = newp + (wp - constr); \
- constr = newp; \
- }
- size_t len = 128;
- char *constr = alloca (len);
- char *wp = constr;
- const char *cp = __gconv_modules_db[cnt]->to_string;
-
- while (*cp != '\0')
- {
- if (*cp != '\\')
- {
- ENSURE_LEN (1);
- *wp++ = *cp++;
- }
- else if (cp[1] == '\0')
- /* Backslash at end of string. */
- break;
- else
+ const char *result_set = (strcmp (runp->to_string, "-") == 0
+ ? (toset_expand ?: toset)
+ : runp->to_string);
+ int cost_hi = runp->cost_hi + current->cost_hi;
+ int cost_lo = runp->cost_lo + current->cost_lo;
+ struct derivation_step *step;
+
+ /* We managed to find a derivation. First see whether
+ we have reached one of the goal nodes. */
+ if (strcmp (result_set, toset) == 0
+ || (toset_expand != NULL
+ && strcmp (result_set, toset_expand) == 0))
+ {
+ /* 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;
+ }
+ }
+ else if (cost_hi < best_cost_hi
+ || (cost_hi == best_cost_hi
+ && cost_lo < best_cost_lo))
+ {
+ /* 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;
+
+ if (step == NULL)
+ {
+ *lastp = NEW_STEP (result_set,
+ cost_hi, cost_lo,
+ runp, current);
+ lastp = &(*lastp)->next;
+ }
+ 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 `first' list. */
+ step->code = runp;
+ step->last = current;
+
+ /* Update the cost for all steps. */
+ for (step = first; step != NULL;
+ step = step->next)
+ /* But don't update the start nodes. */
+ if (step->code != NULL)
{
- ++cp;
- if (*cp == '\\')
- {
- *wp++ = *cp++;
- ENSURE_LEN (1);
- }
- else if (*cp < '1' || *cp > '3')
- break;
- else
+ 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)
{
- int idx = *cp - '0';
- if (match[idx].rm_so == -1)
- /* No match. */
- break;
-
- ENSURE_LEN (match[idx].rm_eo
- - match[idx].rm_so);
- wp = __mempcpy (wp,
- ¤t->result_set[match[idx].rm_so],
- match[idx].rm_eo
- - match[idx].rm_so);
- ++cp;
+ hi += back->code->cost_hi;
+ lo += back->code->cost_lo;
}
+
+ step->cost_hi = hi;
+ step->cost_lo = lo;
}
- }
- if (*cp == '\0' && wp != constr)
- {
- /* Terminate the constructed string. */
- *wp = '\0';
- result_set = constr;
- }
- }
- }
- }
-
- if (result_set != NULL)
- {
- /* We managed to find a derivation. First see whether
- this is what we are looking for. */
- if (__strcasecmp (result_set, toset) == 0
- || (toset_expand != NULL
- && __strcasecmp (result_set, toset_expand) == 0))
- {
- /* Determine the costs. If they are lower than the
- previous solution (or this is the first solution)
- remember this solution. */
- int cost = __gconv_modules_db[cnt]->cost;
- struct derivation_step *runp = current;
- while (runp->code != NULL)
- {
- cost += runp->code->cost;
- runp = runp->last;
- }
- if (best == NULL || cost < best_cost)
- {
- best = NEW_STEP (result_set, __gconv_modules_db[cnt],
- current);
- best_cost = cost;
- }
- }
- else
- {
- /* Append at the end if there is no entry with this name. */
- struct derivation_step *runp = first;
- while (runp != NULL)
- {
- if (__strcasecmp (result_set, runp->result_set) == 0)
- break;
- runp = runp->next;
+ /* Likewise for the nodes on the solution list.
+ Also update best_cost accordingly. */
+ for (step = solution; step != NULL;
+ step = step->next)
+ {
+ step->cost_hi = (step->code->cost_hi
+ + step->last->cost_hi);
+ step->cost_lo = (step->code->cost_lo
+ + step->last->cost_lo);
+
+ if (step->cost_hi < best_cost_hi
+ || (step->cost_hi == best_cost_hi
+ && step->cost_lo < best_cost_lo))
+ {
+ best_cost_hi = step->cost_hi;
+ best_cost_lo = step->cost_lo;
+ }
+ }
+ }
}
- if (runp == NULL)
- {
- *lastp = NEW_STEP (result_set, __gconv_modules_db[cnt],
- current);
- lastp = &(*lastp)->next;
- }
- }
+ runp = runp->same;
+ }
+ while (runp != NULL);
+
+ break;
}
+ else if (cmpres < 0)
+ node = node->left;
+ else
+ node = node->right;
}
-
- /* Go on with the next entry. */
- current = current->next;
}
- if (best != NULL)
- /* We really found a way to do the transformation. Now build a data
- structure describing the transformation steps.*/
- result = gen_steps (best, toset_expand ?: toset, fromset_expand ?: fromset,
- handle, nsteps);
+ if (solution != NULL)
+ {
+ /* 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. */
add_derivation (fromset_expand ?: fromset, toset_expand ?: toset,
*handle, *nsteps);
- __libc_lock_unlock (lock);
+ return result;
+}
+
+
+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
+__gconv_compare_alias (const char *name1, const char *name2)
+{
+ int result;
+
+ /* Ensure that the configuration data is read. */
+ __gconv_load_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
__gconv_find_transform (const char *toset, const char *fromset,
- struct gconv_step **handle, size_t *nsteps)
+ 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);
+ __gconv_load_conf ();
+
+ /* Acquire the 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)
- return GCONV_NOCONV;
+ {
+ __libc_lock_unlock (__gconv_lock);
+ return __GCONV_NOCONV;
+ }
/* See whether the names are aliases. */
- if (__gconv_alias_db != 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
+ copying) when the input and output character set are the same. */
+ && (strcmp (toset, fromset) == 0
+ || (toset_expand != NULL && strcmp (toset_expand, fromset) == 0)
+ || (fromset_expand != NULL
+ && (strcmp (toset, fromset_expand) == 0
+ || (toset_expand != NULL
+ && strcmp (toset_expand, fromset_expand) == 0)))))
{
- 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;
+ /* Both character sets are the same. */
+ __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 (__gconv_lock);
+
/* The following code is necessary since `find_derivation' will return
GCONV_OK even when no derivation was found but the same request
was processed before. I.e., negative results will also be cached. */
- return (result == GCONV_OK
- ? (*handle == NULL ? GCONV_NOCONV : GCONV_OK)
+ return (result == __GCONV_OK
+ ? (*handle == NULL ? __GCONV_NOCONV : __GCONV_OK)
: result);
}
/* Release the entries of the modules list. */
int
-__gconv_close_transform (struct gconv_step *steps, size_t nsteps)
+__gconv_close_transform (struct __gconv_step *steps, size_t nsteps)
{
- int result = GCONV_OK;
+ int result = __GCONV_OK;
+ size_t cnt;
- while (nsteps-- > 0)
- if (steps[nsteps].shlib_handle != NULL)
- {
- result = __gconv_release_shlib (steps[nsteps].shlib_handle);
- if (result != GCONV_OK)
- break;
- }
+ /* Acquire the lock. */
+ __libc_lock_lock (__gconv_lock);
+
+#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 (__gconv_lock);
return result;
}
+/* Free the modules mentioned. */
+static void
+__libc_freeres_fn_section
+free_modules_db (struct gconv_module *node)
+{
+ if (node->left != NULL)
+ free_modules_db (node->left);
+ if (node->right != NULL)
+ free_modules_db (node->right);
+ do
+ {
+ struct gconv_module *act = node;
+ node = node->same;
+ if (act->module_name[0] == '/')
+ free (act);
+ }
+ while (node != NULL);
+}
+
+
/* Free all resources if necessary. */
-static void __attribute__ ((unused))
-free_mem (void)
+libc_freeres_fn (free_mem)
{
- size_t cnt;
+ /* 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);
- for (cnt = 0; cnt < __gconv_nmodules; ++cnt)
- {
- if (__gconv_modules_db[cnt]->from_regex != NULL)
- regfree ((regex_t *) __gconv_modules_db[cnt]->from_regex);
-
- /* Modules which names do not start with a slash are builtin
- transformations and the memory is not allocated dynamically. */
- if (__gconv_modules_db[cnt]->module_name[0] == '/')
- free (__gconv_modules_db[cnt]);
- }
+ if (__gconv_modules_db != NULL)
+ free_modules_db (__gconv_modules_db);
if (known_derivations != NULL)
__tdestroy (known_derivations, free_derivation);
}
-
-text_set_element (__libc_subfreeres, free_mem);
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