755 lines
20 KiB
C
755 lines
20 KiB
C
/* Provide access to the collection of available transformation modules.
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Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <limits.h>
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#include <search.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/param.h>
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#include <bits/libc-lock.h>
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#include <ldsodefs.h>
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#include <gconv_int.h>
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/* Simple data structure for alias mapping. We have two names, `from'
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and `to'. */
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void *__gconv_alias_db;
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/* Array with available modules. */
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struct gconv_module *__gconv_modules_db;
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/* We modify global data. */
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__libc_lock_define_initialized (static, lock)
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/* Function for searching alias. */
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int
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__gconv_alias_compare (const void *p1, const void *p2)
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{
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struct gconv_alias *s1 = (struct gconv_alias *) p1;
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struct gconv_alias *s2 = (struct gconv_alias *) p2;
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return strcmp (s1->fromname, s2->fromname);
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}
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/* To search for a derivation we create a list of intermediate steps.
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Each element contains a pointer to the element which precedes it
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in the derivation order. */
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struct derivation_step
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{
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const char *result_set;
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size_t result_set_len;
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int cost_lo;
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int cost_hi;
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struct gconv_module *code;
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struct derivation_step *last;
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struct derivation_step *next;
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};
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#define NEW_STEP(result, hi, lo, module, last_mod) \
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({ struct derivation_step *newp = alloca (sizeof (struct derivation_step)); \
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newp->result_set = result; \
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newp->result_set_len = strlen (result); \
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newp->cost_hi = hi; \
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newp->cost_lo = lo; \
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newp->code = module; \
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newp->last = last_mod; \
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newp->next = NULL; \
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newp; })
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/* If a specific transformation is used more than once we should not need
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to start looking for it again. Instead cache each successful result. */
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struct known_derivation
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{
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const char *from;
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const char *to;
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struct gconv_step *steps;
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size_t nsteps;
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};
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/* Compare function for database of found derivations. */
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static int
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derivation_compare (const void *p1, const void *p2)
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{
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struct known_derivation *s1 = (struct known_derivation *) p1;
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struct known_derivation *s2 = (struct known_derivation *) p2;
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int result;
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result = strcmp (s1->from, s2->from);
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if (result == 0)
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result = strcmp (s1->to, s2->to);
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return result;
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}
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/* The search tree for known derivations. */
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static void *known_derivations;
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/* Look up whether given transformation was already requested before. */
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static int
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internal_function
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derivation_lookup (const char *fromset, const char *toset,
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struct gconv_step **handle, size_t *nsteps)
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{
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struct known_derivation key = { fromset, toset, NULL, 0 };
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struct known_derivation **result;
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result = __tfind (&key, &known_derivations, derivation_compare);
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if (result == NULL)
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return GCONV_NOCONV;
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*handle = (*result)->steps;
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*nsteps = (*result)->nsteps;
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/* Please note that we return GCONV_OK even if the last search for
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this transformation was unsuccessful. */
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return GCONV_OK;
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}
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/* Add new derivation to list of known ones. */
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static void
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internal_function
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add_derivation (const char *fromset, const char *toset,
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struct gconv_step *handle, size_t nsteps)
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{
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struct known_derivation *new_deriv;
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size_t fromset_len = strlen (fromset) + 1;
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size_t toset_len = strlen (toset) + 1;
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new_deriv = (struct known_derivation *)
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malloc (sizeof (struct known_derivation) + fromset_len + toset_len);
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if (new_deriv != NULL)
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{
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new_deriv->from = memcpy (new_deriv + 1, fromset, fromset_len);
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new_deriv->to = memcpy ((char *) new_deriv->from + fromset_len,
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toset, toset_len);
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new_deriv->steps = handle;
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new_deriv->nsteps = nsteps;
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__tsearch (new_deriv, &known_derivations, derivation_compare);
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}
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/* Please note that we don't complain if the allocation failed. This
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is not tragically but in case we use the memory debugging facilities
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not all memory will be freed. */
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}
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static void
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free_derivation (void *p)
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{
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struct known_derivation *deriv = (struct known_derivation *) p;
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size_t cnt;
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for (cnt = 0; cnt < deriv->nsteps; ++cnt)
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if (deriv->steps[cnt].end_fct)
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_CALL_DL_FCT (deriv->steps[cnt].end_fct, (&deriv->steps[cnt]));
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/* Free the name strings. */
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free ((char *) deriv->steps[0].from_name);
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free ((char *) deriv->steps[deriv->nsteps - 1].to_name);
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free ((struct gconv_step *) deriv->steps);
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free (deriv);
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}
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static int
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internal_function
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gen_steps (struct derivation_step *best, const char *toset,
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const char *fromset, struct gconv_step **handle, size_t *nsteps)
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{
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size_t step_cnt = 0;
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struct gconv_step *result;
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struct derivation_step *current;
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int status = GCONV_NOMEM;
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/* First determine number of steps. */
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for (current = best; current->last != NULL; current = current->last)
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++step_cnt;
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result = (struct gconv_step *) malloc (sizeof (struct gconv_step)
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* step_cnt);
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if (result != NULL)
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{
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int failed = 0;
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status = GCONV_OK;
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*nsteps = step_cnt;
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current = best;
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while (step_cnt-- > 0)
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{
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result[step_cnt].from_name = (step_cnt == 0
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? __strdup (fromset)
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: current->last->result_set);
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result[step_cnt].to_name = (step_cnt + 1 == *nsteps
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? __strdup (current->result_set)
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: result[step_cnt + 1].from_name);
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#ifndef STATIC_GCONV
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if (current->code->module_name[0] == '/')
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{
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/* Load the module, return handle for it. */
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struct gconv_loaded_object *shlib_handle =
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__gconv_find_shlib (current->code->module_name);
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if (shlib_handle == NULL)
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{
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failed = 1;
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break;
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}
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result[step_cnt].shlib_handle = shlib_handle;
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result[step_cnt].modname = shlib_handle->name;
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result[step_cnt].counter = 0;
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result[step_cnt].fct = shlib_handle->fct;
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result[step_cnt].init_fct = shlib_handle->init_fct;
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result[step_cnt].end_fct = shlib_handle->end_fct;
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}
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else
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#endif
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/* It's a builtin transformation. */
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__gconv_get_builtin_trans (current->code->module_name,
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&result[step_cnt]);
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/* Call the init function. */
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if (result[step_cnt].init_fct != NULL)
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{
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status = _CALL_DL_FCT (result[step_cnt].init_fct,
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(&result[step_cnt]));
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if (status != GCONV_OK)
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{
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failed = 1;
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/* Make sure we unload this modules. */
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--step_cnt;
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break;
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}
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}
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current = current->last;
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}
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if (failed != 0)
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{
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/* Something went wrong while initializing the modules. */
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while (++step_cnt < *nsteps)
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{
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if (result[step_cnt].end_fct != NULL)
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_CALL_DL_FCT (result[step_cnt].end_fct, (&result[step_cnt]));
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#ifndef STATIC_GCONV
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__gconv_release_shlib (result[step_cnt].shlib_handle);
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#endif
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}
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free (result);
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*nsteps = 0;
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*handle = NULL;
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if (status == GCONV_OK)
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status = GCONV_NOCONV;
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}
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else
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*handle = result;
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}
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else
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{
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*nsteps = 0;
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*handle = NULL;
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}
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return status;
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}
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/* The main function: find a possible derivation from the `fromset' (either
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the given name or the alias) to the `toset' (again with alias). */
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static int
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internal_function
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find_derivation (const char *toset, const char *toset_expand,
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const char *fromset, const char *fromset_expand,
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struct gconv_step **handle, size_t *nsteps)
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{
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__libc_lock_define_initialized (static, lock)
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struct derivation_step *first, *current, **lastp, *solution = NULL;
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int best_cost_hi = INT_MAX;
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int best_cost_lo = INT_MAX;
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int result;
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result = derivation_lookup (fromset_expand ?: fromset, toset_expand ?: toset,
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handle, nsteps);
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if (result == GCONV_OK)
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return result;
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__libc_lock_lock (lock);
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/* There is a small chance that this derivation is meanwhile found. This
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can happen if in `find_derivation' we look for this derivation, didn't
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find it but at the same time another thread looked for this derivation. */
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result = derivation_lookup (fromset_expand ?: fromset, toset_expand ?: toset,
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handle, nsteps);
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if (result == GCONV_OK)
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{
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__libc_lock_unlock (lock);
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return result;
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}
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/* For now we use a simple algorithm with quadratic runtime behaviour.
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The task is to match the `toset' with any of the available rules,
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starting from FROMSET. */
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if (fromset_expand != NULL)
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{
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first = NEW_STEP (fromset_expand, 0, 0, NULL, NULL);
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first->next = NEW_STEP (fromset, 0, 0, NULL, NULL);
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lastp = &first->next->next;
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}
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else
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{
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first = NEW_STEP (fromset, 0, 0, NULL, NULL);
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lastp = &first->next;
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}
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for (current = first; current != NULL; current = current->next)
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{
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/* Now match all the available module specifications against the
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current charset name. If any of them matches check whether
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we already have a derivation for this charset. If yes, use the
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one with the lower costs. Otherwise add the new charset at the
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end.
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The module database is organized in a tree form which allows to
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search for prefixes. So we search for the first entry with a
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matching prefix and any other matching entry can be found from
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this place. */
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struct gconv_module *node = __gconv_modules_db;
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/* Maybe it is not necessary anymore to look for a solution for
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this entry since the cost is already as high (or heigher) as
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the cost for the best solution so far. */
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if (current->cost_hi > best_cost_hi
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|| (current->cost_hi == best_cost_hi
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&& current->cost_lo >= best_cost_lo))
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continue;
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while (node != NULL)
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{
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int cmpres = strncmp (current->result_set, node->from_constpfx,
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MIN (current->result_set_len,
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node->from_constpfx_len));
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if (cmpres == 0)
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{
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/* Walk through the list of modules with this prefix and
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try to match the name. */
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struct gconv_module *runp;
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if (current->result_set_len < node->from_constpfx_len)
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/* Cannot possibly match. */
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break;
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/* Check all the modules with this prefix. */
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runp = node;
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do
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{
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const char *result_set = NULL;
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if (runp->from_pattern == NULL)
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{
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/* This is a simple entry and therefore we have a
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found an matching entry if the strings are really
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equal. */
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if (current->result_set_len == runp->from_constpfx_len)
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{
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if (strcmp (runp->to_string, "-") == 0)
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result_set = toset_expand ?: toset;
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else
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result_set = runp->to_string;
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}
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}
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else
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{
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/* Compile the regular expression if necessary. */
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if (runp->from_regex == NULL)
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{
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if (__regcomp (&runp->from_regex_mem,
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runp->from_pattern,
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REG_EXTENDED | REG_ICASE) != 0)
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/* Something is wrong. Remember this. */
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runp->from_regex = (regex_t *) -1L;
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else
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runp->from_regex = &runp->from_regex_mem;
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}
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if (runp->from_regex != (regex_t *) -1L)
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{
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regmatch_t match[4];
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/* Try to match the regular expression. */
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if (__regexec (runp->from_regex, current->result_set,
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4, match, 0) == 0
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&& match[0].rm_so == 0
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&& current->result_set[match[0].rm_eo] == '\0')
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{
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/* At least the whole <from> string is matched.
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We must now match sed-like possible
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subexpressions from the match to the
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toset expression. */
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#define ENSURE_LEN(LEN) \
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if (wp + (LEN) >= constr + len - 1) \
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{ \
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char *newp = alloca (len += 128); \
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wp = __mempcpy (newp, constr, wp - constr); \
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constr = newp; \
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}
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size_t len = 128;
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char *constr = alloca (len);
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char *wp = constr;
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const char *cp = runp->to_string;
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while (*cp != '\0')
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{
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if (*cp != '\\')
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{
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ENSURE_LEN (1);
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*wp++ = *cp++;
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}
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else if (cp[1] == '\0')
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/* Backslash at end of string. */
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break;
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else
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{
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++cp;
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if (*cp == '\\')
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{
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*wp++ = *cp++;
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ENSURE_LEN (1);
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}
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else if (*cp < '1' || *cp > '3')
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break;
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else
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{
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int idx = *cp - '0';
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if (match[idx].rm_so == -1)
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/* No match. */
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break;
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ENSURE_LEN (match[idx].rm_eo
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- match[idx].rm_so);
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wp = __mempcpy (wp,
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¤t->result_set[match[idx].rm_so],
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match[idx].rm_eo
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- match[idx].rm_so);
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++cp;
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}
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}
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}
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if (*cp == '\0' && wp != constr)
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{
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/* Terminate the constructed string. */
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*wp = '\0';
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result_set = constr;
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}
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}
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}
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}
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if (result_set != NULL)
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{
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int cost_hi = runp->cost_hi + current->cost_hi;
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int cost_lo = runp->cost_lo + current->cost_lo;
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struct derivation_step *step;
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/* We managed to find a derivation. First see whether
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this is what we are looking for. */
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if (strcmp (result_set, toset) == 0
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|| (toset_expand != NULL
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&& strcmp (result_set, toset_expand) == 0))
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{
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if (solution == NULL || cost_hi < best_cost_hi
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|| (cost_hi == best_cost_hi
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&& cost_lo < best_cost_lo))
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{
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best_cost_hi = cost_hi;
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best_cost_lo = cost_lo;
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}
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/* Append this solution to list. */
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if (solution == NULL)
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solution = NEW_STEP (result_set, 0, 0, runp,
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current);
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else
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{
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while (solution->next != NULL)
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solution = solution->next;
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solution->next = NEW_STEP (result_set, 0, 0,
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runp, current);
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}
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}
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else if (cost_hi < best_cost_hi
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|| (cost_hi == best_cost_hi
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&& cost_lo < best_cost_lo))
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{
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/* Append at the end if there is no entry with
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this name. */
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for (step = first; step != NULL; step = step->next)
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if (strcmp (result_set, step->result_set) == 0)
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break;
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if (step == NULL)
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{
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*lastp = NEW_STEP (result_set,
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cost_hi, cost_lo,
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runp, current);
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lastp = &(*lastp)->next;
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}
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else if (step->cost_hi > cost_hi
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|| (step->cost_hi == cost_hi
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&& step->cost_lo > cost_lo))
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{
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step->code = runp;
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step->last = current;
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/* Update the cost for all steps. */
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for (step = first; step != NULL;
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step = step->next)
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{
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struct derivation_step *back;
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|
|
|
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;
|
|
}
|
|
}
|
|
|
|
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))
|
|
{
|
|
solution = step;
|
|
best_cost_hi = step->cost_hi;
|
|
best_cost_lo = step->cost_lo;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
runp = runp->same;
|
|
}
|
|
while (runp != NULL);
|
|
|
|
if (current->result_set_len == node->from_constpfx_len)
|
|
break;
|
|
|
|
node = node->matching;
|
|
}
|
|
else if (cmpres < 0)
|
|
node = node->left;
|
|
else
|
|
node = node->right;
|
|
}
|
|
}
|
|
|
|
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);
|
|
else
|
|
{
|
|
/* We haven't found a transformation. Clear the result values. */
|
|
*handle = NULL;
|
|
*nsteps = 0;
|
|
}
|
|
|
|
/* Add result in any case to list of known derivations. */
|
|
add_derivation (fromset_expand ?: fromset, toset_expand ?: toset,
|
|
*handle, *nsteps);
|
|
|
|
__libc_lock_unlock (lock);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
int
|
|
internal_function
|
|
__gconv_find_transform (const char *toset, const char *fromset,
|
|
struct gconv_step **handle, size_t *nsteps)
|
|
{
|
|
__libc_once_define (static, once);
|
|
const char *fromset_expand = NULL;
|
|
const char *toset_expand = NULL;
|
|
int result;
|
|
|
|
/* Ensure that the configuration data is read. */
|
|
__libc_once (once, __gconv_read_conf);
|
|
|
|
/* Acquire the lock. */
|
|
__libc_lock_lock (lock);
|
|
|
|
/* If we don't have a module database return with an error. */
|
|
if (__gconv_modules_db == NULL)
|
|
{
|
|
__libc_lock_unlock (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;
|
|
}
|
|
|
|
result = find_derivation (toset, toset_expand, fromset, fromset_expand,
|
|
handle, nsteps);
|
|
|
|
#ifndef STATIC_GCONV
|
|
/* Increment the user counter. */
|
|
if (result == GCONV_OK)
|
|
{
|
|
size_t cnt = *nsteps;
|
|
struct gconv_step *steps = *handle;
|
|
|
|
do
|
|
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;
|
|
}
|
|
}
|
|
while (cnt > 0);
|
|
}
|
|
#endif
|
|
|
|
/* Release the lock. */
|
|
__libc_lock_unlock (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)
|
|
: result);
|
|
}
|
|
|
|
|
|
/* Release the entries of the modules list. */
|
|
int
|
|
internal_function
|
|
__gconv_close_transform (struct gconv_step *steps, size_t nsteps)
|
|
{
|
|
int result = GCONV_OK;
|
|
|
|
#ifndef STATIC_GCONV
|
|
/* Acquire the lock. */
|
|
__libc_lock_lock (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;
|
|
}
|
|
|
|
/* Release the lock. */
|
|
__libc_lock_unlock (lock);
|
|
#endif
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/* Free the modules mentioned. */
|
|
static void
|
|
internal_function
|
|
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);
|
|
if (node->same != NULL)
|
|
free_modules_db (node->same);
|
|
do
|
|
{
|
|
struct gconv_module *act = node;
|
|
node = node->matching;
|
|
if (act->module_name[0] == '/')
|
|
free (act);
|
|
}
|
|
while (node != NULL);
|
|
}
|
|
|
|
|
|
/* Free all resources if necessary. */
|
|
static void __attribute__ ((unused))
|
|
free_mem (void)
|
|
{
|
|
if (__gconv_alias_db != NULL)
|
|
__tdestroy (__gconv_alias_db, free);
|
|
|
|
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);
|