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1 | /* Convert characters in input buffer using conversion descriptor to | |
2 | output buffer. | |
3 | Copyright (C) 1997-2024 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 | ||
29 | int | |
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 | } |