1 /* Find matching transformation algorithms and initialize steps.
2 Copyright (C) 1997, 1998, 1999 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)
32 struct __gconv_step *steps;
34 __gconv_t result = NULL;
38 res = __gconv_find_transform (toset, fromset, &steps, &nsteps);
39 if (res == __GCONV_OK)
41 /* Allocate room for handle. */
42 result = (__gconv_t) malloc (sizeof (struct __gconv_info)
44 * sizeof (struct __gconv_step_data)));
49 /* Remember the list of steps. */
50 result->__steps = steps;
51 result->__nsteps = nsteps;
53 /* Clear the array for the step data. */
54 memset (result->__data, '\0',
55 nsteps * sizeof (struct __gconv_step_data));
57 /* Call all initialization functions for the transformation
58 step implemenations. */
59 for (cnt = 0; cnt < nsteps; ++cnt)
61 /* If this is the last step we must not allocate an
63 result->__data[cnt].__is_last = cnt == nsteps - 1;
65 /* Reset the counter. */
66 result->__data[cnt].__invocation_counter = 0;
68 /* It's a regular use. */
69 result->__data[cnt].__internal_use = 0;
71 /* We use the `mbstate_t' member in DATA. */
72 result->__data[cnt].__statep = &result->__data[cnt].__state;
74 /* Allocate the buffer. */
75 if (!result->__data[cnt].__is_last)
77 size_t size = (GCONV_NCHAR_GOAL
78 * steps[cnt].__max_needed_to);
80 result->__data[cnt].__outbuf = (char *) malloc (size);
81 if (result->__data[cnt].__outbuf == NULL)
86 result->__data[cnt].__outbufend =
87 result->__data[cnt].__outbuf + size;
93 if (res != __GCONV_OK)
95 /* Something went wrong. Free all the resources. */
101 free (result->__data[cnt].__outbuf);
107 __gconv_close_transform (steps, nsteps);
109 __set_errno (serrno);