Update.
[glibc.git] / iconv / gconv_open.c
blob842bf7356605be69fc1aa0511d42f5ccae3ba753
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. */
21 #include <errno.h>
22 #include <stdlib.h>
23 #include <string.h>
25 #include <gconv_int.h>
28 int
29 internal_function
30 __gconv_open (const char *toset, const char *fromset, __gconv_t *handle,
31 int flags)
33 struct __gconv_step *steps;
34 size_t nsteps;
35 __gconv_t result = NULL;
36 size_t cnt = 0;
37 int res;
38 int conv_flags = 0;
39 const char *errhand;
40 const char *ignore;
41 struct trans_struct *trans = NULL;
43 /* Find out whether any error handling method is specified. */
44 errhand = strchr (toset, '/');
45 if (errhand != NULL)
46 errhand = strchr (errhand + 1, '/');
47 if (__builtin_expect (errhand != NULL, 1))
49 if (*++errhand == '\0')
50 errhand = NULL;
51 else
53 /* Make copy without the error handling description. */
54 char *newtoset = (char *) alloca (errhand - toset + 1);
55 char *tok;
56 char *ptr;
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);
65 while (tok != NULL)
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)
77 break;
78 else
79 lastp = runp;
81 if (runp == NULL)
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;
91 newp->ncsnames = 1;
92 newp->trans_fct = __gconv_transliterate;
94 if (lastp == NULL)
95 trans = newp;
96 else
97 lastp->next = newp;
100 else if (__strcasecmp (tok, "IGNORE") == 0)
101 /* Set the flag to ignore all errors. */
102 flags = __GCONV_IGNORE_ERRORS;
103 else
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)
114 break;
115 else
116 lastp = runp;
118 if (runp == NULL)
120 struct trans_struct *newp;
122 newp = (struct trans_struct *) alloca (sizeof (*newp));
123 memset (newp, '\0', sizeof (*newp));
124 newp->name = tok;
126 if (lastp == NULL)
127 trans = newp;
128 else
129 lastp->next = 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)
161 lastp = runp;
162 else
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)
169 + (nsteps
170 * sizeof (struct __gconv_step_data)));
171 if (result == NULL)
172 res = __GCONV_NOMEM;
173 else
175 size_t n;
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)
189 size_t size;
191 /* Would have to be done if we would not clear the whole
192 array above. */
193 #if 0
194 /* Reset the counter. */
195 result->__data[cnt].__invocation_counter = 0;
197 /* It's a regular use. */
198 result->__data[cnt].__internal_use = 0;
199 #endif
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)
211 void *data = NULL;
213 /* Match! Now try the initializer. */
214 if (runp->trans_init_fct == NULL
215 || (runp->trans_init_fct (&data,
216 steps[cnt].__to_name)
217 == __GCONV_OK))
219 /* Append at the end of the list. */
220 struct __gconv_trans_data *newp;
221 struct __gconv_trans_data **lastp;
223 newp = (struct __gconv_trans_data *)
224 malloc (sizeof (struct __gconv_trans_data));
225 if (newp == NULL)
226 goto bail;
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;
231 newp->__data = data;
232 newp->__next = NULL;
234 lastp = &result->__data[cnt].__trans;
235 while (*lastp != NULL)
236 lastp = &(*lastp)->__next;
238 *lastp = newp;
240 break;
243 /* If this is the last step we must not allocate an
244 output buffer. */
245 if (cnt < nsteps - 1)
247 result->__data[cnt].__flags = conv_flags;
249 /* Allocate the buffer. */
250 size = (GCONV_NCHAR_GOAL * steps[cnt].__max_needed_to);
252 result->__data[cnt].__outbuf = (char *) malloc (size);
253 if (result->__data[cnt].__outbuf == NULL)
254 goto bail;
256 result->__data[cnt].__outbufend =
257 result->__data[cnt].__outbuf + size;
259 else
261 /* Handle the last entry. */
262 result->__data[cnt].__flags = conv_flags | __GCONV_IS_LAST;
264 break;
269 if (res != __GCONV_OK)
271 /* Something went wrong. Free all the resources. */
272 int serrno;
273 bail:
274 serrno = errno;
276 if (result != NULL)
278 while (cnt-- > 0)
280 struct __gconv_trans_data *transp;
282 transp = result->__data[cnt].__trans;
283 while (transp != NULL)
285 struct __gconv_trans_data *curp = transp;
286 transp = transp->__next;
288 if (__builtin_expect (curp->__trans_end_fct != NULL, 0))
289 curp->__trans_end_fct (curp->__data);
291 free (curp);
294 free (result->__data[cnt].__outbuf);
297 free (result);
298 result = NULL;
301 __gconv_close_transform (steps, nsteps);
303 __set_errno (serrno);
307 *handle = result;
308 return res;