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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) == 0) | |
{ | |
/* It's the builtin transliteration handling. We only | |
support it for working on the internal encoding. */ | |
static const char *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 = 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) == 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) == 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) == 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; | |
} |