1 /* Find matching transformation algorithms and initialize steps.
2 Copyright (C) 1997, 1998, 1999, 2000 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 Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 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 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
25 #include <gconv_int.h>
30 __gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
33 struct __gconv_step *steps;
35 __gconv_t result = NULL;
40 struct trans_struct *trans = NULL;
42 /* Find out whether any error handling method is specified. */
43 errhand = strchr (toset, '/');
45 errhand = strchr (errhand + 1, '/');
46 if (__builtin_expect (errhand != NULL, 1))
48 if (*++errhand == '\0')
52 /* Make copy without the error handling description. */
53 char *newtoset = (char *) alloca (errhand - toset + 1);
57 newtoset[errhand - toset] = '\0';
58 toset = memcpy (newtoset, toset, errhand - toset);
60 /* Find the appropriate transliteration handlers. */
61 tok = strdupa (errhand);
63 tok = __strtok_r (tok, ",", &ptr);
66 if (__strcasecmp (tok, "TRANSLIT") == 0)
68 /* It's the builtin transliteration handling. We only
69 support it for working on the internal encoding. */
70 static const char *internal_trans_names[1] = { "INTERNAL" };
71 struct trans_struct *lastp = NULL;
72 struct trans_struct *runp;
74 for (runp = trans; runp != NULL; runp = runp->next)
75 if (runp->trans_fct == __gconv_transliterate)
82 struct trans_struct *newp;
84 newp = (struct trans_struct *) alloca (sizeof (*newp));
85 memset (newp, '\0', sizeof (*newp));
87 /* We leave the `name' field zero to signal that
88 this is an internal transliteration step. */
89 newp->csnames = internal_trans_names;
91 newp->trans_fct = __gconv_transliterate;
99 else if (__strcasecmp (tok, "IGNORE") == 0)
100 /* Set the flag to ignore all errors. */
101 flags = __GCONV_IGNORE_ERRORS;
104 /* `tok' is possibly a module name. We'll see later
105 whether we can find it. But first see that we do
106 not already a module of this name. */
107 struct trans_struct *lastp = NULL;
108 struct trans_struct *runp;
110 for (runp = trans; runp != NULL; runp = runp->next)
111 if (runp->name != NULL
112 && __strcasecmp (tok, runp->name) == 0)
119 struct trans_struct *newp;
121 newp = (struct trans_struct *) alloca (sizeof (*newp));
122 memset (newp, '\0', sizeof (*newp));
132 tok = __strtok_r (NULL, ",", &ptr);
137 /* For the source character set we ignore the error handler specification.
138 XXX Is this really always the best? */
139 ignore = strchr (fromset, '/');
140 if (ignore != NULL && (ignore = strchr (ignore + 1, '/')) != NULL
141 && *++ignore != '\0')
143 char *newfromset = (char *) alloca (ignore - fromset + 1);
145 newfromset[ignore - fromset] = '\0';
146 fromset = memcpy (newfromset, fromset, ignore - fromset);
149 res = __gconv_find_transform (toset, fromset, &steps, &nsteps, flags);
150 if (res == __GCONV_OK)
152 /* Find the modules. */
153 struct trans_struct *lastp = NULL;
154 struct trans_struct *runp;
156 for (runp = trans; runp != NULL; runp = runp->next)
158 if (runp->name == NULL
159 || __builtin_expect (__gconv_translit_find (runp), 0) == 0)
162 /* This means we haven't found the module. Remove it. */
163 (lastp == NULL ? trans : lastp->next) = runp->next;
166 /* Allocate room for handle. */
167 result = (__gconv_t) malloc (sizeof (struct __gconv_info)
169 * sizeof (struct __gconv_step_data)));
176 /* Remember the list of steps. */
177 result->__steps = steps;
178 result->__nsteps = nsteps;
180 /* Clear the array for the step data. */
181 memset (result->__data, '\0',
182 nsteps * sizeof (struct __gconv_step_data));
184 /* Call all initialization functions for the transformation
185 step implementations. */
186 for (cnt = 0; cnt < nsteps; ++cnt)
190 /* Would have to be done if we would not clear the whole
193 /* Reset the counter. */
194 result->__data[cnt].__invocation_counter = 0;
196 /* It's a regular use. */
197 result->__data[cnt].__internal_use = 0;
200 /* We use the `mbstate_t' member in DATA. */
201 result->__data[cnt].__statep = &result->__data[cnt].__state;
203 /* Now see whether we can use any of the transliteration
204 modules for this step. */
205 for (runp = trans; runp != NULL; runp = runp->next)
206 for (n = 0; n < runp->ncsnames; ++n)
207 if (__strcasecmp (steps[cnt].__from_name,
208 runp->csnames[n]) == 0)
212 /* Match! Now try the initializer. */
213 if (runp->trans_init_fct == NULL
214 || (runp->trans_init_fct (&data,
215 steps[cnt].__to_name)
218 /* Append at the end of the list. */
219 struct __gconv_trans_data *newp;
220 struct __gconv_trans_data **lastp;
222 newp = (struct __gconv_trans_data *)
223 malloc (sizeof (struct __gconv_trans_data));
230 newp->__trans_fct = runp->trans_fct;
231 newp->__trans_context_fct = runp->trans_context_fct;
232 newp->__trans_end_fct = runp->trans_end_fct;
236 lastp = &result->__data[cnt].__trans;
237 while (*lastp != NULL)
238 lastp = &(*lastp)->__next;
245 /* If this is the last step we must not allocate an
247 if (cnt < nsteps - 1)
249 result->__data[cnt].__flags = flags;
251 /* Allocate the buffer. */
252 size = (GCONV_NCHAR_GOAL * steps[cnt].__max_needed_to);
254 result->__data[cnt].__outbuf = (char *) malloc (size);
255 if (result->__data[cnt].__outbuf == NULL)
261 result->__data[cnt].__outbufend =
262 result->__data[cnt].__outbuf + size;
266 /* Handle the last entry. */
267 result->__data[cnt].__flags = flags | __GCONV_IS_LAST;
274 if (res != __GCONV_OK)
276 /* Something went wrong. Free all the resources. */
285 struct __gconv_trans_data *transp;
287 transp = result->__data[cnt].__trans;
288 while (transp != NULL)
290 struct __gconv_trans_data *curp = transp;
291 transp = transp->__next;
293 if (__builtin_expect (curp->__trans_end_fct != NULL, 0))
294 curp->__trans_end_fct (curp->__data);
299 free (result->__data[cnt].__outbuf);
306 __gconv_close_transform (steps, nsteps);
308 __set_errno (serrno);