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) 2001 Sun Microsystems, Inc.
23 * All rights reserved.
24 */
25 #include <stdio.h>
26 #include <errno.h>
27 #include <strings.h>
28 #include <stdlib.h>
29 #include "pc-iscii.h"
30
31 #define MSB 0x80
32 #define REPLACE_CHAR '?'
33
34 typedef struct _icv_state {
35 int dummy;
36 } _iconv_st;
37
38 static uchar
traverse_table(Entry * entry,int num,uchar pc_iscii)39 traverse_table(Entry *entry , int num, uchar pc_iscii)
40 {
41 int i=0;
42 uchar iscii=0;
43
44 for ( ; i < num; ++i) {
45 Entry en = entry[i];
46
47 if ( pc_iscii < en.pc_iscii ) break;
48 if ( pc_iscii >= en.pc_iscii && pc_iscii < en.pc_iscii + en.count ) {
49 iscii = (pc_iscii - en.pc_iscii) + en.iscii;
50 break;
51 }
52 }
53
54 return iscii;
55 }
56
57 void *
_icv_open()58 _icv_open()
59 {
60 _iconv_st *st;
61
62 if ((st = (_iconv_st*)malloc(sizeof(_iconv_st))) == NULL) {
63 errno = ENOMEM;
64 return ((void*)-1);
65 }
66
67 bzero(st, sizeof(_iconv_st));
68
69 return ((void*)st);
70 }
71
72 /*
73 * Close; called from iconv_close()
74 */
75 void
_icv_close(_iconv_st * st)76 _icv_close(_iconv_st *st)
77 {
78 if (!st)
79 errno = EBADF;
80 else
81 free(st);
82 }
83
84 size_t
_icv_iconv(_iconv_st * st,char ** inbuf,size_t * inbytesleft,char ** outbuf,size_t * outbytesleft)85 _icv_iconv(_iconv_st *st, char **inbuf, size_t *inbytesleft,
86 char **outbuf, size_t *outbytesleft)
87 {
88 if (st == NULL) {
89 errno = EBADF;
90 return ((size_t) -1);
91 }
92
93 if (inbuf == NULL || *inbuf == NULL) { /* Reset request. */
94 return ((size_t)0);
95 }
96
97 /* a state machine for interpreting ISCII code */
98 while (*inbytesleft > 0 && *outbytesleft > 0) {
99 uchar c = (uchar)**inbuf;
100
101 if ( c & MSB ) {
102 uchar iscii = traverse_table(pciscii_isc_tbl,
103 sizeof(pciscii_isc_tbl)/sizeof(Entry), c);
104 if ( iscii ) **outbuf = iscii;
105 else **outbuf = REPLACE_CHAR;
106 } else { /* ASCII */
107 **outbuf = c;
108 }
109
110 (*inbuf)++;
111 (*inbytesleft)--;
112 (*outbuf)++;
113 (*outbytesleft)--;
114 }
115
116 if ( *inbytesleft > 0 && *outbytesleft == 0 ) {
117 errno = E2BIG;
118 return ((size_t)-1);
119 }
120
121 return ((size_t)(*inbytesleft));
122 }
123