1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2008, by Sun Microsystems, Inc.
23 * All rights reserved.
24 */
25 #include <stdio.h>
26 #include <errno.h>
27 #include <stdlib.h>
28 #include <sys/types.h>
29 #define __NEED_UNI_2_TCVN__
30 #include <unicode_tcvn.h> /* Unicode to TCVN mapping table */
31 #include "common_defs.h"
32
33 #define NON_ID_CHAR '?' /* non-identified character */
34
35 typedef struct _icv_state {
36 int _errno; /* internal errno */
37 } _iconv_st;
38
39
40 /*
41 * Open; called from iconv_open()
42 */
43 void *
_icv_open()44 _icv_open()
45 {
46 _iconv_st *st;
47
48 if ((st = (_iconv_st *)malloc(sizeof(_iconv_st))) == NULL) {
49 errno = ENOMEM;
50 return ((void *) -1);
51 }
52
53 st->_errno = 0;
54 return ((void *) st);
55 }
56
57
58 /*
59 * Close; called from iconv_close()
60 */
61 void
_icv_close(_iconv_st * st)62 _icv_close(_iconv_st *st)
63 {
64 if (!st)
65 errno = EBADF;
66 else
67 free(st);
68 }
69
70
71 /*
72 * Actual conversion; called from iconv()
73 */
74 size_t
_icv_iconv(_iconv_st * st,char ** inbuf,size_t * inbytesleft,char ** outbuf,size_t * outbytesleft)75 _icv_iconv(_iconv_st *st, char **inbuf, size_t *inbytesleft,
76 char **outbuf, size_t *outbytesleft)
77 {
78 int no_id_char_num = 0;
79 #ifdef DEBUG
80 fprintf(stderr, "========== iconv(): UCS-2 --> TCVN5712 ==========\n");
81 #endif
82 if (st == NULL) {
83 errno = EBADF;
84 return ((size_t) -1);
85 }
86
87 if (inbuf == NULL || *inbuf == NULL) { /* Reset request. */
88 st->_errno = 0;
89 return ((size_t) 0);
90 }
91
92 st->_errno = 0; /* Rreset internal errno */
93 errno = 0; /* Rreset external errno */
94
95 /* Convert UCS-2 encoding to TCVN5712 */
96 while (*inbytesleft > 0 && *outbytesleft > 0) {
97 unsigned long uni = 0;
98 unsigned char c1 = 0, c2 = 0;
99 unsigned char ch = 0;
100
101 c1 = **inbuf;
102 if (*inbytesleft <= 1 ) {
103 errno = EINVAL;
104 return ((size_t)-1);
105 }
106 (*inbuf)++;
107 (*inbytesleft) -= 1;
108 c2 = **inbuf;
109 (*inbuf)++;
110 (*inbytesleft) -= 1;
111
112 #if defined(UCS_2LE)
113 uni |= (unsigned long)c1;
114 uni |= (unsigned long)c2<< 8;
115 #else
116 uni |= (unsigned long)c1<< 8;
117 uni |= (unsigned long)c2;
118 #endif
119 if ( *inbytesleft > 0 && *outbytesleft <= 0 ) {
120 errno = E2BIG;
121 (*inbuf) -= 2;
122 (*inbytesleft) +=2;
123 return ((size_t)-1);
124 }
125
126 if (uni_2_tcvn(uni, &ch) == 1) {
127 **outbuf = ch;
128 } else {
129 **outbuf = NON_ID_CHAR;
130 no_id_char_num += 1;
131 }
132 (*outbuf) += 1;
133 (*outbytesleft) -= 1;
134
135 }
136
137 return ((size_t)no_id_char_num);
138 }
139