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;
41 struct trans_struct *trans = NULL;
43 /* Find out whether any error handling method is specified. */
44 errhand = strchr (toset, '/');
46 errhand = strchr (errhand + 1, '/');
47 if (__builtin_expect (errhand != NULL, 1))
49 if (*++errhand == '\0')
53 /* Make copy without the error handling description. */
54 char *newtoset = (char *) alloca (errhand - toset + 1);
58 newtoset[errhand - toset] = '\0';
59 toset = memcpy (newtoset, toset, errhand - toset);
61 /* Find the appropriate transliteration handlers. */
62 tok = strdupa (errhand);
64 tok = __strtok_r (tok, ",", &ptr);
67 if (__strcasecmp (tok, "TRANSLIT") == 0)
69 /* It's the builtin transliteration handling. We only
70 support it for working on the internal encoding. */
71 static const char *internal_trans_names[1] = { "INTERNAL" };
72 struct trans_struct *lastp = NULL;
73 struct trans_struct *runp;
75 for (runp = trans; runp != NULL; runp = runp->next)
76 if (runp->trans_fct == __gconv_transliterate)
83 struct trans_struct *newp;
85 newp = (struct trans_struct *) alloca (sizeof (*newp));
86 memset (newp, '\0', sizeof (*newp));
88 /* We leave the `name' field zero to signal that
89 this is an internal transliteration step. */
90 newp->csnames = internal_trans_names;
92 newp->trans_fct = __gconv_transliterate;
100 else if (__strcasecmp (tok, "IGNORE") == 0)
101 /* Set the flag to ignore all errors. */
102 flags = __GCONV_IGNORE_ERRORS;
105 /* `tok' is possibly a module name. We'll see later
106 whether we can find it. But first see that we do
107 not already a module of this name. */
108 struct trans_struct *lastp = NULL;
109 struct trans_struct *runp;
111 for (runp = trans; runp != NULL; runp = runp->next)
112 if (runp->name != NULL
113 && __strcasecmp (tok, runp->name) == 0)
120 struct trans_struct *newp;
122 newp = (struct trans_struct *) alloca (sizeof (*newp));
123 memset (newp, '\0', sizeof (*newp));
133 tok = __strtok_r (NULL, ",", &ptr);
138 /* For the source character set we ignore the error handler specification.
139 XXX Is this really always the best? */
140 ignore = strchr (fromset, '/');
141 if (ignore != NULL && (ignore = strchr (ignore + 1, '/')) != NULL
142 && *++ignore != '\0')
144 char *newfromset = (char *) alloca (ignore - fromset + 1);
146 newfromset[ignore - fromset] = '\0';
147 fromset = memcpy (newfromset, fromset, ignore - fromset);
150 res = __gconv_find_transform (toset, fromset, &steps, &nsteps, flags);
151 if (res == __GCONV_OK)
153 /* Find the modules. */
154 struct trans_struct *lastp = NULL;
155 struct trans_struct *runp;
157 for (runp = trans; runp != NULL; runp = runp->next)
159 if (runp->name == NULL
160 || __builtin_expect (__gconv_translit_find (runp), 0) == 0)
163 /* This means we haven't found the module. Remove it. */
164 (lastp == NULL ? trans : lastp->next) = runp->next;
167 /* Allocate room for handle. */
168 result = (__gconv_t) malloc (sizeof (struct __gconv_info)
170 * sizeof (struct __gconv_step_data)));
177 /* Remember the list of steps. */
178 result->__steps = steps;
179 result->__nsteps = nsteps;
181 /* Clear the array for the step data. */
182 memset (result->__data, '\0',
183 nsteps * sizeof (struct __gconv_step_data));
185 /* Call all initialization functions for the transformation
186 step implementations. */
187 for (cnt = 0; cnt < nsteps; ++cnt)
191 /* Would have to be done if we would not clear the whole
194 /* Reset the counter. */
195 result->__data[cnt].__invocation_counter = 0;
197 /* It's a regular use. */
198 result->__data[cnt].__internal_use = 0;
201 /* We use the `mbstate_t' member in DATA. */
202 result->__data[cnt].__statep = &result->__data[cnt].__state;
204 /* Now see whether we can use any of the transliteration
205 modules for this step. */
206 for (runp = trans; runp != NULL; runp = runp->next)
207 for (n = 0; n < runp->ncsnames; ++n)
208 if (__strcasecmp (steps[cnt].__from_name,
209 runp->csnames[n]) == 0)
213 /* Match! Now try the initializer. */
214 if (runp->trans_init_fct == NULL
215 || (runp->trans_init_fct (data, steps[cnt].__to_name)
218 /* Append at the end of the list. */
219 struct __gconv_trans_data *newp;
220 struct __gconv_trans_data *endp;
221 struct __gconv_trans_data *lastp;
223 newp = (struct __gconv_trans_data *)
224 malloc (sizeof (struct __gconv_trans_data));
228 newp->__trans_fct = runp->trans_fct;
229 newp->__trans_context_fct = runp->trans_context_fct;
230 newp->__trans_end_fct = runp->trans_end_fct;
235 for (endp = result->__data[cnt].__trans;
236 endp != NULL; endp = endp->__next)
240 result->__data[cnt].__trans = newp;
242 lastp->__next = newp;
247 /* If this is the last step we must not allocate an
249 if (cnt < nsteps - 1)
251 result->__data[cnt].__flags = conv_flags;
253 /* Allocate the buffer. */
254 size = (GCONV_NCHAR_GOAL * steps[cnt].__max_needed_to);
256 result->__data[cnt].__outbuf = (char *) malloc (size);
257 if (result->__data[cnt].__outbuf == NULL)
260 result->__data[cnt].__outbufend =
261 result->__data[cnt].__outbuf + size;
265 /* Handle the last entry. */
266 result->__data[cnt].__flags = conv_flags | __GCONV_IS_LAST;
273 if (res != __GCONV_OK)
275 /* Something went wrong. Free all the resources. */
284 struct __gconv_trans_data *transp;
286 transp = result->__data[cnt].__trans;
287 while (transp != NULL)
289 struct __gconv_trans_data *curp = transp;
290 transp = transp->__next;
292 if (__builtin_expect (curp->__trans_end_fct != NULL, 0))
293 curp->__trans_end_fct (curp->__data);
298 free (result->__data[cnt].__outbuf);
305 __gconv_close_transform (steps, nsteps);
307 __set_errno (serrno);