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glibc/iconv/gconv_open.c

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/* Find matching transformation algorithms and initialize steps.
Copyright (C) 1997,1998,1999,2000,2001,2004,2005
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#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;
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;
}
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