[thirdparty/glibc.git] / iconv / gconv_open.c

/* Find matching transformation algorithms and initialize steps.
   Copyright (C) 1997-2012 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 Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <locale.h>
#include "../locale/localeinfo.h"
#include <stdlib.h>
#include <string.h>

#include <gconv_int.h>


int
internal_function
__gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
	      int flags)
{
  struct __gconv_step *steps;
  size_t nsteps;
  __gconv_t result = NULL;
  size_t cnt = 0;
  int res;
  int conv_flags = 0;
  const char *errhand;
  const char *ignore;
  struct trans_struct *trans = NULL;

  /* Find out whether any error handling method is specified.  */
  errhand = strchr (toset, '/');
  if (errhand != NULL)
    errhand = strchr (errhand + 1, '/');
  if (__builtin_expect (errhand != NULL, 1))
    {
      if (*++errhand == '\0')
	errhand = NULL;
      else
	{
	  /* Make copy without the error handling description.  */
	  char *newtoset = (char *) alloca (errhand - toset + 1);
	  char *tok;
	  char *ptr = NULL /* Work around a bogus warning */;

	  newtoset[errhand - toset] = '\0';
	  toset = memcpy (newtoset, toset, errhand - toset);

	  /* Find the appropriate transliteration handlers.  */
	  tok = strdupa (errhand);

	  tok = __strtok_r (tok, ",", &ptr);
	  while (tok != NULL)
	    {
	      if (__strcasecmp_l (tok, "TRANSLIT", _nl_C_locobj_ptr) == 0)
		{
		  /* It's the builtin transliteration handling.  We only
		     support it for working on the internal encoding.  */
		  static const char *const internal_trans_names[1]
		    = { "INTERNAL" };
		  struct trans_struct *lastp = NULL;
		  struct trans_struct *runp;

		  for (runp = trans; runp != NULL; runp = runp->next)
		    if (runp->trans_fct == __gconv_transliterate)
		      break;
		    else
		      lastp = runp;

		  if (runp == NULL)
		    {
		      struct trans_struct *newp;

		      newp = (struct trans_struct *) alloca (sizeof (*newp));
		      memset (newp, '\0', sizeof (*newp));

		      /* We leave the `name' field zero to signal that
			 this is an internal transliteration step.  */
		      newp->csnames = (const char **) internal_trans_names;
		      newp->ncsnames = 1;
		      newp->trans_fct = __gconv_transliterate;

		      if (lastp == NULL)
			trans = newp;
		      else
			lastp->next = newp;
		    }
		}
	      else if (__strcasecmp_l (tok, "IGNORE", _nl_C_locobj_ptr) == 0)
		/* Set the flag to ignore all errors.  */
		conv_flags |= __GCONV_IGNORE_ERRORS;
	      else
		{
		  /* `tok' is possibly a module name.  We'll see later
		     whether we can find it.  But first see that we do
		     not already a module of this name.  */
		  struct trans_struct *lastp = NULL;
		  struct trans_struct *runp;

		  for (runp = trans; runp != NULL; runp = runp->next)
		    if (runp->name != NULL
			&& __strcasecmp_l (tok, runp->name,
					   _nl_C_locobj_ptr) == 0)
		      break;
		    else
		      lastp = runp;

		  if (runp == NULL)
		    {
		      struct trans_struct *newp;

		      newp = (struct trans_struct *) alloca (sizeof (*newp));
		      memset (newp, '\0', sizeof (*newp));
		      newp->name = tok;

		      if (lastp == NULL)
			trans = newp;
		      else
			lastp->next = newp;
		    }
		}

	      tok = __strtok_r (NULL, ",", &ptr);
	    }
	}
    }

  /* For the source character set we ignore the error handler specification.
     XXX Is this really always the best?  */
  ignore = strchr (fromset, '/');
  if (ignore != NULL && (ignore = strchr (ignore + 1, '/')) != NULL
      && *++ignore != '\0')
    {
      char *newfromset = (char *) alloca (ignore - fromset + 1);

      newfromset[ignore - fromset] = '\0';
      fromset = memcpy (newfromset, fromset, ignore - fromset);
    }

  /* If the string is empty define this to mean the charset of the
     currently selected locale.  */
  if (strcmp (toset, "//") == 0)
    {
      const char *codeset = _NL_CURRENT (LC_CTYPE, CODESET);
      size_t len = strlen (codeset);
      char *dest;
      toset = dest = (char *) alloca (len + 3);
      memcpy (__mempcpy (dest, codeset, len), "//", 3);
    }
  if (strcmp (fromset, "//") == 0)
    {
      const char *codeset = _NL_CURRENT (LC_CTYPE, CODESET);
      size_t len = strlen (codeset);
      char *dest;
      fromset = dest = (char *) alloca (len + 3);
      memcpy (__mempcpy (dest, codeset, len), "//", 3);
    }

  res = __gconv_find_transform (toset, fromset, &steps, &nsteps, flags);
  if (res == __GCONV_OK)
    {
      /* Find the modules.  */
      struct trans_struct *lastp = NULL;
      struct trans_struct *runp;

      for (runp = trans; runp != NULL; runp = runp->next)
	{
	  if (runp->name == NULL
	      || __builtin_expect (__gconv_translit_find (runp), 0) == 0)
	    lastp = runp;
	  else
	    {
	      /* This means we haven't found the module.  Remove it.  */
	      if (lastp == NULL)
		trans  = runp->next;
	      else
		lastp->next  = runp->next;
	    }
	}

      /* Allocate room for handle.  */
      result = (__gconv_t) malloc (sizeof (struct __gconv_info)
				   + (nsteps
				      * sizeof (struct __gconv_step_data)));
      if (result == NULL)
	res = __GCONV_NOMEM;
      else
	{
	  size_t n;

	  /* Remember the list of steps.  */
	  result->__steps = steps;
	  result->__nsteps = nsteps;

	  /* Clear the array for the step data.  */
	  memset (result->__data, '\0',
		  nsteps * sizeof (struct __gconv_step_data));

	  /* Call all initialization functions for the transformation
	     step implementations.  */
	  for (cnt = 0; cnt < nsteps; ++cnt)
	    {
	      size_t size;

	      /* Would have to be done if we would not clear the whole
                 array above.  */
#if 0
	      /* Reset the counter.  */
	      result->__data[cnt].__invocation_counter = 0;

	      /* It's a regular use.  */
	      result->__data[cnt].__internal_use = 0;
#endif

	      /* We use the `mbstate_t' member in DATA.  */
	      result->__data[cnt].__statep = &result->__data[cnt].__state;

	      /* Now see whether we can use any of the transliteration
		 modules for this step.  */
	      for (runp = trans; runp != NULL; runp = runp->next)
		for (n = 0; n < runp->ncsnames; ++n)
		  if (__strcasecmp_l (steps[cnt].__from_name,
				      runp->csnames[n], _nl_C_locobj_ptr) == 0)
		    {
		      void *data = NULL;

		      /* Match!  Now try the initializer.  */
		      if (runp->trans_init_fct == NULL
			  || (runp->trans_init_fct (&data,
						    steps[cnt].__to_name)
			      == __GCONV_OK))
			{
			  /* Append at the end of the list.  */
			  struct __gconv_trans_data *newp;
			  struct __gconv_trans_data **lastp;

			  newp = (struct __gconv_trans_data *)
			    malloc (sizeof (struct __gconv_trans_data));
			  if (newp == NULL)
			    {
			      res = __GCONV_NOMEM;
			      goto bail;
			    }

			  newp->__trans_fct = runp->trans_fct;
			  newp->__trans_context_fct = runp->trans_context_fct;
			  newp->__trans_end_fct = runp->trans_end_fct;
			  newp->__data = data;
			  newp->__next = NULL;

			  lastp = &result->__data[cnt].__trans;
			  while (*lastp != NULL)
			    lastp = &(*lastp)->__next;

			  *lastp = newp;
			}
		      break;
		    }

	      /* If this is the last step we must not allocate an
		 output buffer.  */
	      if (cnt < nsteps - 1)
		{
		  result->__data[cnt].__flags = conv_flags;

		  /* Allocate the buffer.  */
		  size = (GCONV_NCHAR_GOAL * steps[cnt].__max_needed_to);

		  result->__data[cnt].__outbuf = malloc (size);
		  if (result->__data[cnt].__outbuf == NULL)
		    {
		      res = __GCONV_NOMEM;
		      goto bail;
		    }

		  result->__data[cnt].__outbufend =
		    result->__data[cnt].__outbuf + size;
		}
	      else
		{
		  /* Handle the last entry.  */
		  result->__data[cnt].__flags = conv_flags | __GCONV_IS_LAST;

		  break;
		}
	    }
	}

      if (res != __GCONV_OK)
	{
	  /* Something went wrong.  Free all the resources.  */
	  int serrno;
	bail:
	  serrno = errno;

	  if (result != NULL)
	    {
	      while (cnt-- > 0)
		{
		  struct __gconv_trans_data *transp;

		  transp = result->__data[cnt].__trans;
		  while (transp != NULL)
		    {
		      struct __gconv_trans_data *curp = transp;
		      transp = transp->__next;

		      if (__builtin_expect (curp->__trans_end_fct != NULL, 0))
			curp->__trans_end_fct (curp->__data);

		      free (curp);
		    }

		  free (result->__data[cnt].__outbuf);
		}

	      free (result);
	      result = NULL;
	    }

	  __gconv_close_transform (steps, nsteps);

	  __set_errno (serrno);
	}
    }

  *handle = result;
  return res;
}
Commit	Line	Data
6973fc01	1	/* Find matching transformation algorithms and initialize steps.
f4cf5f2d	2	Copyright (C) 1997-2012 Free Software Foundation, Inc.
6973fc01 UD	3	This file is part of the GNU C Library.
	4	Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
	5
	6	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	7	modify it under the terms of the GNU Lesser General Public
	8	License as published by the Free Software Foundation; either
	9	version 2.1 of the License, or (at your option) any later version.
6973fc01 UD	10
	11	The GNU C Library is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41bdb6e2	14	Lesser General Public License for more details.
6973fc01	15
41bdb6e2	16	You should have received a copy of the GNU Lesser General Public
59ba27a6 PE	17	License along with the GNU C Library; if not, see
59ba27a6 PE	18	<http://www.gnu.org/licenses/>. */
6973fc01 UD	19
6973fc01 UD	20	#include <errno.h>
5db91571	21	#include <locale.h>
e0e86ccb	22	#include "../locale/localeinfo.h"
6973fc01	23	#include <stdlib.h>
fd19ed3d	24	#include <string.h>
6973fc01	25
e62c19f1 UD	26	#include <gconv_int.h>
e62c19f1 UD	27
6973fc01 UD	28
6973fc01 UD	29	int
e62c19f1	30	internal_function
c90a2db6 UD	31	__gconv_open (const char toset, const char fromset, __gconv_t *handle,
c90a2db6 UD	32	int flags)
6973fc01	33	{
d64b6ad0	34	struct __gconv_step *steps;
6973fc01	35	size_t nsteps;
d64b6ad0	36	__gconv_t result = NULL;
6973fc01 UD	37	size_t cnt = 0;
6973fc01 UD	38	int res;
306eeae5	39	int conv_flags = 0;
55985355	40	const char *errhand;
323fb88d	41	const char *ignore;
d6204268	42	struct trans_struct *trans = NULL;
85830c4c	43
55985355 UD	44	/* Find out whether any error handling method is specified. */
	45	errhand = strchr (toset, '/');
	46	if (errhand != NULL)
	47	errhand = strchr (errhand + 1, '/');
	48	if (__builtin_expect (errhand != NULL, 1))
85830c4c	49	{
323fb88d	50	if (*++errhand == '\0')
55985355 UD	51	errhand = NULL;
	52	else
	53	{
	54	/* Make copy without the error handling description. */
	55	char newtoset = (char ) alloca (errhand - toset + 1);
d6204268	56	char *tok;
9d9febc7	57	char ptr = NULL / Work around a bogus warning */;
85830c4c	58
55985355 UD	59	newtoset[errhand - toset] = '\0';
55985355 UD	60	toset = memcpy (newtoset, toset, errhand - toset);
85830c4c	61
d6204268 UD	62	/* Find the appropriate transliteration handlers. */
d6204268 UD	63	tok = strdupa (errhand);
55985355	64
d6204268 UD	65	tok = __strtok_r (tok, ",", &ptr);
d6204268 UD	66	while (tok != NULL)
55985355	67	{
4b5b009c	68	if (__strcasecmp_l (tok, "TRANSLIT", _nl_C_locobj_ptr) == 0)
d6204268 UD	69	{
	70	/* It's the builtin transliteration handling. We only
	71	support it for working on the internal encoding. */
b7cc4503 UD	72	static const char *const internal_trans_names[1]
b7cc4503 UD	73	= { "INTERNAL" };
d6204268 UD	74	struct trans_struct *lastp = NULL;
	75	struct trans_struct *runp;
	76
	77	for (runp = trans; runp != NULL; runp = runp->next)
	78	if (runp->trans_fct == __gconv_transliterate)
	79	break;
	80	else
	81	lastp = runp;
	82
	83	if (runp == NULL)
	84	{
	85	struct trans_struct *newp;
	86
	87	newp = (struct trans_struct ) alloca (sizeof (newp));
	88	memset (newp, '\0', sizeof (*newp));
	89
	90	/* We leave the `name' field zero to signal that
	91	this is an internal transliteration step. */
b7cc4503	92	newp->csnames = (const char **) internal_trans_names;
d6204268 UD	93	newp->ncsnames = 1;
	94	newp->trans_fct = __gconv_transliterate;
	95
	96	if (lastp == NULL)
	97	trans = newp;
	98	else
	99	lastp->next = newp;
	100	}
	101	}
4b5b009c	102	else if (__strcasecmp_l (tok, "IGNORE", _nl_C_locobj_ptr) == 0)
d6204268	103	/* Set the flag to ignore all errors. */
306eeae5	104	conv_flags \|= __GCONV_IGNORE_ERRORS;
d6204268 UD	105	else
	106	{
	107	/* `tok' is possibly a module name. We'll see later
	108	whether we can find it. But first see that we do
	109	not already a module of this name. */
	110	struct trans_struct *lastp = NULL;
	111	struct trans_struct *runp;
	112
	113	for (runp = trans; runp != NULL; runp = runp->next)
	114	if (runp->name != NULL
5db91571	115	&& __strcasecmp_l (tok, runp->name,
4b5b009c	116	_nl_C_locobj_ptr) == 0)
d6204268 UD	117	break;
	118	else
	119	lastp = runp;
	120
	121	if (runp == NULL)
	122	{
	123	struct trans_struct *newp;
	124
	125	newp = (struct trans_struct ) alloca (sizeof (newp));
	126	memset (newp, '\0', sizeof (*newp));
	127	newp->name = tok;
	128
	129	if (lastp == NULL)
	130	trans = newp;
	131	else
	132	lastp->next = newp;
	133	}
	134	}
	135
	136	tok = __strtok_r (NULL, ",", &ptr);
55985355 UD	137	}
55985355 UD	138	}
85830c4c	139	}
6973fc01	140
323fb88d UD	141	/* For the source character set we ignore the error handler specification.
	142	XXX Is this really always the best? */
	143	ignore = strchr (fromset, '/');
	144	if (ignore != NULL && (ignore = strchr (ignore + 1, '/')) != NULL
	145	&& *++ignore != '\0')
	146	{
	147	char newfromset = (char ) alloca (ignore - fromset + 1);
	148
	149	newfromset[ignore - fromset] = '\0';
	150	fromset = memcpy (newfromset, fromset, ignore - fromset);
	151	}
	152
e0e86ccb UD	153	/* If the string is empty define this to mean the charset of the
	154	currently selected locale. */
	155	if (strcmp (toset, "//") == 0)
	156	{
	157	const char *codeset = _NL_CURRENT (LC_CTYPE, CODESET);
	158	size_t len = strlen (codeset);
	159	char *dest;
	160	toset = dest = (char *) alloca (len + 3);
	161	memcpy (__mempcpy (dest, codeset, len), "//", 3);
	162	}
	163	if (strcmp (fromset, "//") == 0)
	164	{
	165	const char *codeset = _NL_CURRENT (LC_CTYPE, CODESET);
	166	size_t len = strlen (codeset);
	167	char *dest;
	168	fromset = dest = (char *) alloca (len + 3);
	169	memcpy (__mempcpy (dest, codeset, len), "//", 3);
	170	}
	171
c90a2db6	172	res = __gconv_find_transform (toset, fromset, &steps, &nsteps, flags);
d64b6ad0	173	if (res == __GCONV_OK)
6973fc01	174	{
d6204268 UD	175	/* Find the modules. */
	176	struct trans_struct *lastp = NULL;
	177	struct trans_struct *runp;
	178
	179	for (runp = trans; runp != NULL; runp = runp->next)
55985355	180	{
d6204268 UD	181	if (runp->name == NULL
	182	\|\| __builtin_expect (__gconv_translit_find (runp), 0) == 0)
	183	lastp = runp;
	184	else
cdda3d7d AJ	185	{
	186	/* This means we haven't found the module. Remove it. */
	187	if (lastp == NULL)
	188	trans = runp->next;
	189	else
	190	lastp->next = runp->next;
	191	}
55985355 UD	192	}
55985355 UD	193
6973fc01	194	/* Allocate room for handle. */
d64b6ad0 UD	195	result = (__gconv_t) malloc (sizeof (struct __gconv_info)
	196	+ (nsteps
	197	* sizeof (struct __gconv_step_data)));
6973fc01	198	if (result == NULL)
d64b6ad0	199	res = __GCONV_NOMEM;
6973fc01 UD	200	else
6973fc01 UD	201	{
55985355 UD	202	size_t n;
55985355 UD	203
6973fc01	204	/* Remember the list of steps. */
d64b6ad0 UD	205	result->__steps = steps;
d64b6ad0 UD	206	result->__nsteps = nsteps;
6973fc01	207
390500b1	208	/* Clear the array for the step data. */
d64b6ad0 UD	209	memset (result->__data, '\0',
d64b6ad0 UD	210	nsteps * sizeof (struct __gconv_step_data));
6973fc01	211
390500b1	212	/* Call all initialization functions for the transformation
49c091e5	213	step implementations. */
405b8c60	214	for (cnt = 0; cnt < nsteps; ++cnt)
6973fc01	215	{
0aece08d UD	216	size_t size;
0aece08d UD	217
8b682b99 UD	218	/* Would have to be done if we would not clear the whole
8b682b99 UD	219	array above. */
85830c4c	220	#if 0
390500b1	221	/* Reset the counter. */
d64b6ad0	222	result->__data[cnt].__invocation_counter = 0;
6973fc01	223
390500b1	224	/* It's a regular use. */
d64b6ad0	225	result->__data[cnt].__internal_use = 0;
85830c4c	226	#endif
e3e0a182	227
390500b1	228	/* We use the `mbstate_t' member in DATA. */
d64b6ad0	229	result->__data[cnt].__statep = &result->__data[cnt].__state;
e3e0a182	230
d6204268 UD	231	/* Now see whether we can use any of the transliteration
	232	modules for this step. */
	233	for (runp = trans; runp != NULL; runp = runp->next)
	234	for (n = 0; n < runp->ncsnames; ++n)
5db91571	235	if (__strcasecmp_l (steps[cnt].__from_name,
4b5b009c	236	runp->csnames[n], _nl_C_locobj_ptr) == 0)
d6204268 UD	237	{
	238	void *data = NULL;
	239
	240	/* Match! Now try the initializer. */
	241	if (runp->trans_init_fct == NULL
8114530a UD	242	\|\| (runp->trans_init_fct (&data,
8114530a UD	243	steps[cnt].__to_name)
d6204268 UD	244	== __GCONV_OK))
	245	{
	246	/* Append at the end of the list. */
	247	struct __gconv_trans_data *newp;
8114530a	248	struct __gconv_trans_data **lastp;
d6204268 UD	249
	250	newp = (struct __gconv_trans_data *)
	251	malloc (sizeof (struct __gconv_trans_data));
	252	if (newp == NULL)
67aacae6 UD	253	{
	254	res = __GCONV_NOMEM;
	255	goto bail;
	256	}
d6204268 UD	257
	258	newp->__trans_fct = runp->trans_fct;
	259	newp->__trans_context_fct = runp->trans_context_fct;
	260	newp->__trans_end_fct = runp->trans_end_fct;
8114530a	261	newp->__data = data;
e993e9cc	262	newp->__next = NULL;
d6204268	263
8114530a UD	264	lastp = &result->__data[cnt].__trans;
	265	while (*lastp != NULL)
	266	lastp = &(*lastp)->__next;
d6204268	267
8114530a	268	*lastp = newp;
d6204268 UD	269	}
	270	break;
	271	}
0aece08d	272
405b8c60 UD	273	/* If this is the last step we must not allocate an
	274	output buffer. */
	275	if (cnt < nsteps - 1)
d6204268	276	{
306eeae5	277	result->__data[cnt].__flags = conv_flags;
d6204268	278
405b8c60 UD	279	/* Allocate the buffer. */
405b8c60 UD	280	size = (GCONV_NCHAR_GOAL * steps[cnt].__max_needed_to);
d6204268	281
9cfe5381	282	result->__data[cnt].__outbuf = malloc (size);
405b8c60	283	if (result->__data[cnt].__outbuf == NULL)
67aacae6 UD	284	{
	285	res = __GCONV_NOMEM;
	286	goto bail;
	287	}
d6204268	288
405b8c60 UD	289	result->__data[cnt].__outbufend =
	290	result->__data[cnt].__outbuf + size;
	291	}
	292	else
	293	{
	294	/* Handle the last entry. */
306eeae5	295	result->__data[cnt].__flags = conv_flags \| __GCONV_IS_LAST;
7039a4c9	296
d6204268 UD	297	break;
d6204268 UD	298	}
405b8c60	299	}
6973fc01	300	}
6973fc01	301
45eca4d1	302	if (res != __GCONV_OK)
6973fc01	303	{
45eca4d1	304	/* Something went wrong. Free all the resources. */
d6204268 UD	305	int serrno;
	306	bail:
	307	serrno = errno;
6973fc01	308
45eca4d1 UD	309	if (result != NULL)
	310	{
	311	while (cnt-- > 0)
d6204268 UD	312	{
	313	struct __gconv_trans_data *transp;
	314
	315	transp = result->__data[cnt].__trans;
	316	while (transp != NULL)
	317	{
	318	struct __gconv_trans_data *curp = transp;
	319	transp = transp->__next;
	320
	321	if (__builtin_expect (curp->__trans_end_fct != NULL, 0))
	322	curp->__trans_end_fct (curp->__data);
	323
	324	free (curp);
	325	}
	326
	327	free (result->__data[cnt].__outbuf);
	328	}
45eca4d1 UD	329
	330	free (result);
	331	result = NULL;
	332	}
6973fc01	333
45eca4d1	334	__gconv_close_transform (steps, nsteps);
6973fc01	335
45eca4d1 UD	336	__set_errno (serrno);
45eca4d1 UD	337	}
6973fc01 UD	338	}
	339
	340	*handle = result;
	341	return res;
	342	}