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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 <stddef.h> /* for NULL */ | |
21 | #include <errno.h> | |
22 | #include <iconv.h> | |
23 | ||
24 | #include <gconv_int.h> | |
25 | ||
26 | #include <assert.h> | |
27 | ||
28 | ||
29 | size_t | |
30 | iconv (iconv_t cd, char **inbuf, size_t *inbytesleft, char **outbuf, | |
31 | size_t *outbytesleft) | |
32 | { | |
33 | __gconv_t gcd = (__gconv_t) cd; | |
34 | char *outstart = outbuf ? *outbuf : NULL; | |
35 | size_t irreversible; | |
36 | int result; | |
37 | ||
38 | if (__glibc_unlikely (inbuf == NULL || *inbuf == NULL)) | |
39 | { | |
40 | if (outbuf == NULL || *outbuf == NULL) | |
41 | result = __gconv (gcd, NULL, NULL, NULL, NULL, &irreversible); | |
42 | else | |
43 | result = __gconv (gcd, NULL, NULL, (unsigned char **) outbuf, | |
44 | (unsigned char *) (outstart + *outbytesleft), | |
45 | &irreversible); | |
46 | } | |
47 | else | |
48 | { | |
49 | const char *instart = *inbuf; | |
50 | ||
51 | result = __gconv (gcd, (const unsigned char **) inbuf, | |
52 | (const unsigned char *) (*inbuf + *inbytesleft), | |
53 | (unsigned char **) outbuf, | |
54 | (unsigned char *) (*outbuf + *outbytesleft), | |
55 | &irreversible); | |
56 | ||
57 | *inbytesleft -= *inbuf - instart; | |
58 | } | |
59 | if (outstart != NULL) | |
60 | *outbytesleft -= *outbuf - outstart; | |
61 | ||
62 | switch (__builtin_expect (result, __GCONV_OK)) | |
63 | { | |
64 | case __GCONV_ILLEGAL_DESCRIPTOR: | |
65 | __set_errno (EBADF); | |
66 | irreversible = (size_t) -1L; | |
67 | break; | |
68 | ||
69 | case __GCONV_ILLEGAL_INPUT: | |
70 | __set_errno (EILSEQ); | |
71 | irreversible = (size_t) -1L; | |
72 | break; | |
73 | ||
74 | case __GCONV_FULL_OUTPUT: | |
75 | __set_errno (E2BIG); | |
76 | irreversible = (size_t) -1L; | |
77 | break; | |
78 | ||
79 | case __GCONV_INCOMPLETE_INPUT: | |
80 | __set_errno (EINVAL); | |
81 | irreversible = (size_t) -1L; | |
82 | break; | |
83 | ||
84 | case __GCONV_EMPTY_INPUT: | |
85 | case __GCONV_OK: | |
86 | /* Nothing. */ | |
87 | break; | |
88 | ||
89 | default: | |
90 | assert (!"Nothing like this should happen"); | |
91 | } | |
92 | ||
93 | return irreversible; | |
94 | } |