1/* Convert characters in input buffer using conversion descriptor to
2 output buffer.
3 Copyright (C) 1997-2020 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <https://www.gnu.org/licenses/>. */
20
21#include <assert.h>
22#include <dlfcn.h>
23#include <stddef.h>
24#include <sys/param.h>
25
26#include <gconv_int.h>
27#include <sysdep.h>
28
29
30int
31__gconv (__gconv_t cd, const unsigned char **inbuf,
32 const unsigned char *inbufend, unsigned char **outbuf,
33 unsigned char *outbufend, size_t *irreversible)
34{
35 size_t last_step;
36 int result;
37
38 if (cd == (__gconv_t) -1L)
39 return __GCONV_ILLEGAL_DESCRIPTOR;
40
41 last_step = cd->__nsteps - 1;
42
43 assert (irreversible != NULL);
44 *irreversible = 0;
45
46 cd->__data[last_step].__outbuf = outbuf != NULL ? *outbuf : NULL;
47 cd->__data[last_step].__outbufend = outbufend;
48
49 __gconv_fct fct = cd->__steps->__fct;
50#ifdef PTR_DEMANGLE
51 if (cd->__steps->__shlib_handle != NULL)
52 PTR_DEMANGLE (fct);
53#endif
54
55 if (inbuf == NULL || *inbuf == NULL)
56 {
57 /* We just flush. */
58 result = DL_CALL_FCT (fct,
59 (cd->__steps, cd->__data, NULL, NULL, NULL,
60 irreversible,
61 cd->__data[last_step].__outbuf == NULL ? 2 : 1,
62 0));
63
64 /* If the flush was successful clear the rest of the state. */
65 if (result == __GCONV_OK)
66 for (size_t cnt = 0; cnt <= last_step; ++cnt)
67 cd->__data[cnt].__invocation_counter = 0;
68 }
69 else
70 {
71 const unsigned char *last_start;
72
73 assert (outbuf != NULL && *outbuf != NULL);
74
75 do
76 {
77 last_start = *inbuf;
78 result = DL_CALL_FCT (fct,
79 (cd->__steps, cd->__data, inbuf, inbufend,
80 NULL, irreversible, 0, 0));
81 }
82 while (result == __GCONV_EMPTY_INPUT && last_start != *inbuf
83 && *inbuf + cd->__steps->__min_needed_from <= inbufend);
84 }
85
86 if (outbuf != NULL && *outbuf != NULL)
87 *outbuf = cd->__data[last_step].__outbuf;
88
89 return result;
90}
91