1/* Convert characters in input buffer using conversion descriptor to
2 output buffer.
3 Copyright (C) 1997-2023 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
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 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20#include <assert.h>
21#include <dlfcn.h>
22#include <stddef.h>
23#include <sys/param.h>
24
25#include <gconv_int.h>
26#include <pointer_guard.h>
27
28
29int
30__gconv (__gconv_t cd, const unsigned char **inbuf,
31 const unsigned char *inbufend, unsigned char **outbuf,
32 unsigned char *outbufend, size_t *irreversible)
33{
34 size_t last_step;
35 int result;
36
37 if (cd == (__gconv_t) -1L)
38 return __GCONV_ILLEGAL_DESCRIPTOR;
39
40 last_step = cd->__nsteps - 1;
41
42 assert (irreversible != NULL);
43 *irreversible = 0;
44
45 cd->__data[last_step].__outbuf = outbuf != NULL ? *outbuf : NULL;
46 cd->__data[last_step].__outbufend = outbufend;
47
48 __gconv_fct fct = cd->__steps->__fct;
49 if (cd->__steps->__shlib_handle != NULL)
50 PTR_DEMANGLE (fct);
51
52 if (inbuf == NULL || *inbuf == NULL)
53 {
54 /* We just flush. */
55 result = DL_CALL_FCT (fct,
56 (cd->__steps, cd->__data, NULL, NULL, NULL,
57 irreversible,
58 cd->__data[last_step].__outbuf == NULL ? 2 : 1,
59 0));
60
61 /* If the flush was successful clear the rest of the state. */
62 if (result == __GCONV_OK)
63 for (size_t cnt = 0; cnt <= last_step; ++cnt)
64 cd->__data[cnt].__invocation_counter = 0;
65 }
66 else
67 {
68 const unsigned char *last_start;
69
70 assert (outbuf != NULL && *outbuf != NULL);
71
72 do
73 {
74 last_start = *inbuf;
75 result = DL_CALL_FCT (fct,
76 (cd->__steps, cd->__data, inbuf, inbufend,
77 NULL, irreversible, 0, 0));
78 }
79 while (result == __GCONV_EMPTY_INPUT && last_start != *inbuf
80 && *inbuf + cd->__steps->__min_needed_from <= inbufend);
81 }
82
83 if (outbuf != NULL && *outbuf != NULL)
84 *outbuf = cd->__data[last_step].__outbuf;
85
86 return result;
87}
88