1 /* Find matching transformation algorithms and initialize steps.
2 Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
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.
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
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
26 #include <gconv_int.h>
31 __gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
34 struct __gconv_step *steps;
36 __gconv_t result = NULL;
42 struct trans_struct *trans = NULL;
44 /* Find out whether any error handling method is specified. */
45 errhand = strchr (toset, '/');
47 errhand = strchr (errhand + 1, '/');
48 if (__builtin_expect (errhand != NULL, 1))
50 if (*++errhand == '\0')
54 /* Make copy without the error handling description. */
55 char *newtoset = (char *) alloca (errhand - toset + 1);
59 newtoset[errhand - toset] = '\0';
60 toset = memcpy (newtoset, toset, errhand - toset);
62 /* Find the appropriate transliteration handlers. */
63 tok = strdupa (errhand);
65 tok = __strtok_r (tok, ",", &ptr);
68 if (__strcasecmp_l (tok, "TRANSLIT", &_nl_C_locobj) == 0)
70 /* It's the builtin transliteration handling. We only
71 support it for working on the internal encoding. */
72 static const char *internal_trans_names[1] = { "INTERNAL" };
73 struct trans_struct *lastp = NULL;
74 struct trans_struct *runp;
76 for (runp = trans; runp != NULL; runp = runp->next)
77 if (runp->trans_fct == __gconv_transliterate)
84 struct trans_struct *newp;
86 newp = (struct trans_struct *) alloca (sizeof (*newp));
87 memset (newp, '\0', sizeof (*newp));
89 /* We leave the `name' field zero to signal that
90 this is an internal transliteration step. */
91 newp->csnames = internal_trans_names;
93 newp->trans_fct = __gconv_transliterate;
101 else if (__strcasecmp_l (tok, "IGNORE", &_nl_C_locobj) == 0)
102 /* Set the flag to ignore all errors. */
103 conv_flags |= __GCONV_IGNORE_ERRORS;
106 /* `tok' is possibly a module name. We'll see later
107 whether we can find it. But first see that we do
108 not already a module of this name. */
109 struct trans_struct *lastp = NULL;
110 struct trans_struct *runp;
112 for (runp = trans; runp != NULL; runp = runp->next)
113 if (runp->name != NULL
114 && __strcasecmp_l (tok, runp->name,
122 struct trans_struct *newp;
124 newp = (struct trans_struct *) alloca (sizeof (*newp));
125 memset (newp, '\0', sizeof (*newp));
135 tok = __strtok_r (NULL, ",", &ptr);
140 /* For the source character set we ignore the error handler specification.
141 XXX Is this really always the best? */
142 ignore = strchr (fromset, '/');
143 if (ignore != NULL && (ignore = strchr (ignore + 1, '/')) != NULL
144 && *++ignore != '\0')
146 char *newfromset = (char *) alloca (ignore - fromset + 1);
148 newfromset[ignore - fromset] = '\0';
149 fromset = memcpy (newfromset, fromset, ignore - fromset);
152 res = __gconv_find_transform (toset, fromset, &steps, &nsteps, flags);
153 if (res == __GCONV_OK)
155 /* Find the modules. */
156 struct trans_struct *lastp = NULL;
157 struct trans_struct *runp;
159 for (runp = trans; runp != NULL; runp = runp->next)
161 if (runp->name == NULL
162 || __builtin_expect (__gconv_translit_find (runp), 0) == 0)
165 /* This means we haven't found the module. Remove it. */
166 (lastp == NULL ? trans : lastp->next) = runp->next;
169 /* Allocate room for handle. */
170 result = (__gconv_t) malloc (sizeof (struct __gconv_info)
172 * sizeof (struct __gconv_step_data)));
179 /* Remember the list of steps. */
180 result->__steps = steps;
181 result->__nsteps = nsteps;
183 /* Clear the array for the step data. */
184 memset (result->__data, '\0',
185 nsteps * sizeof (struct __gconv_step_data));
187 /* Call all initialization functions for the transformation
188 step implementations. */
189 for (cnt = 0; cnt < nsteps; ++cnt)
193 /* Would have to be done if we would not clear the whole
196 /* Reset the counter. */
197 result->__data[cnt].__invocation_counter = 0;
199 /* It's a regular use. */
200 result->__data[cnt].__internal_use = 0;
203 /* We use the `mbstate_t' member in DATA. */
204 result->__data[cnt].__statep = &result->__data[cnt].__state;
206 /* Now see whether we can use any of the transliteration
207 modules for this step. */
208 for (runp = trans; runp != NULL; runp = runp->next)
209 for (n = 0; n < runp->ncsnames; ++n)
210 if (__strcasecmp_l (steps[cnt].__from_name,
211 runp->csnames[n], &_nl_C_locobj) == 0)
215 /* Match! Now try the initializer. */
216 if (runp->trans_init_fct == NULL
217 || (runp->trans_init_fct (&data,
218 steps[cnt].__to_name)
221 /* Append at the end of the list. */
222 struct __gconv_trans_data *newp;
223 struct __gconv_trans_data **lastp;
225 newp = (struct __gconv_trans_data *)
226 malloc (sizeof (struct __gconv_trans_data));
233 newp->__trans_fct = runp->trans_fct;
234 newp->__trans_context_fct = runp->trans_context_fct;
235 newp->__trans_end_fct = runp->trans_end_fct;
239 lastp = &result->__data[cnt].__trans;
240 while (*lastp != NULL)
241 lastp = &(*lastp)->__next;
248 /* If this is the last step we must not allocate an
250 if (cnt < nsteps - 1)
252 result->__data[cnt].__flags = conv_flags;
254 /* Allocate the buffer. */
255 size = (GCONV_NCHAR_GOAL * steps[cnt].__max_needed_to);
257 result->__data[cnt].__outbuf = (char *) malloc (size);
258 if (result->__data[cnt].__outbuf == NULL)
264 result->__data[cnt].__outbufend =
265 result->__data[cnt].__outbuf + size;
269 /* Handle the last entry. */
270 result->__data[cnt].__flags = conv_flags | __GCONV_IS_LAST;
277 if (res != __GCONV_OK)
279 /* Something went wrong. Free all the resources. */
288 struct __gconv_trans_data *transp;
290 transp = result->__data[cnt].__trans;
291 while (transp != NULL)
293 struct __gconv_trans_data *curp = transp;
294 transp = transp->__next;
296 if (__builtin_expect (curp->__trans_end_fct != NULL, 0))
297 curp->__trans_end_fct (curp->__data);
302 free (result->__data[cnt].__outbuf);
309 __gconv_close_transform (steps, nsteps);
311 __set_errno (serrno);