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. */
24 #include <gconv_int.h>
29 __gconv_open (const char *toset, const char *fromset, __gconv_t *handle)
31 struct __gconv_step *steps;
33 __gconv_t result = NULL;
37 res = __gconv_find_transform (toset, fromset, &steps, &nsteps);
38 if (res == __GCONV_OK)
40 /* Allocate room for handle. */
41 result = (__gconv_t) malloc (sizeof (struct __gconv_info)
43 * sizeof (struct __gconv_step_data)));
48 /* Remember the list of steps. */
49 result->__steps = steps;
50 result->__nsteps = nsteps;
52 /* Clear the array for the step data. */
53 memset (result->__data, '\0',
54 nsteps * sizeof (struct __gconv_step_data));
56 /* Call all initialization functions for the transformation
57 step implemenations. */
58 for (cnt = 0; cnt < nsteps; ++cnt)
60 /* If this is the last step we must not allocate an
62 result->__data[cnt].__is_last = cnt == nsteps - 1;
64 /* Reset the counter. */
65 result->__data[cnt].__invocation_counter = 0;
67 /* It's a regular use. */
68 result->__data[cnt].__internal_use = 0;
70 /* We use the `mbstate_t' member in DATA. */
71 result->__data[cnt].__statep = &result->__data[cnt].__state;
73 /* Allocate the buffer. */
74 if (!result->__data[cnt].__is_last)
76 size_t size = (GCONV_NCHAR_GOAL
77 * steps[cnt].__max_needed_to);
79 result->__data[cnt].__outbuf = (char *) malloc (size);
80 if (result->__data[cnt].__outbuf == NULL)
85 result->__data[cnt].__outbufend =
86 result->__data[cnt].__outbuf + size;
92 if (res != __GCONV_OK)
94 /* Something went wrong. Free all the resources. */
100 free (result->__data[cnt].__outbuf);
106 __gconv_close_transform (steps, nsteps);
108 __set_errno (serrno);