usr/src/lib/libcurses/screen/mbtranslate.c

   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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*  Copyright (c) 1988 AT&T */
  23 /*    All Rights Reserved   */
  24
  25
  26 /*
  27  *      Copyright (c) 1997, by Sun Microsystems, Inc.
  28  *      All rights reserved.
  29  */
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32
  33 #include        <stdlib.h>
  34 #include        <sys/types.h>
  35 #include        "curses_inc.h"
  36
  37
  38 /*
  39  *      Translate process code to byte-equivalent
  40  *      Return the length of the byte-equivalent string
  41  */
  42
  43 /*
  44  *      use _curs_wctomb() instead of _code2byte(code, bytes)
  45  */
  46
  47
  48 /*
  49  *      Translate a set of byte to a single process code
  50  */
  51
  52 /*
  53  *      use _curs_mbtowc() instead of wchar_t _byte2code(bytes)
  54  */
  55
  56
  57 /*
  58  *      Translate a string of wchar_t to a byte string.
  59  *      code: the input code string
  60  *      byte: if not NULL, space to store the output string
  61  *      n: maximum number of codes to be translated.
  62  */
  63 char
  64 *_strcode2byte(wchar_t *code, char *byte, int n)
  65 {
  66         char            *bufp;
  67         wchar_t         *endcode;
  68         static char     *buf;
  69         static int      bufsize;
  70
  71         /* compute the length of the code string */
  72         if (n < 0)
  73                 for (n = 0; code[n] != 0; ++n)
  74                         ;
  75
  76         /* get space to store the translated string */
  77         if (!byte && (n*CSMAX+1) > bufsize) {
  78                 if (buf)
  79                         free(buf);
  80                 bufsize = n * CSMAX + 1;
  81                 if ((buf = malloc(bufsize * sizeof (char))) == NULL)
  82                         bufsize = 0;
  83                 }
  84
  85         /* no space to do it */
  86         if (!byte && !buf)
  87                 return (NULL);
  88
  89         /* start the translation */
  90         bufp = byte ? byte : buf;
  91         endcode = code+n;
  92         while (code < endcode && *code) {
  93                 bufp += _curs_wctomb(bufp, *code & TRIM);
  94                 ++code;
  95         }
  96         *bufp = '\0';
  97
  98         return (byte ? byte : buf);
  99 }
 100
 101
 102
 103 /*
 104  *      Translate a byte-string to a wchar_t string.
 105  */
 106 wchar_t
 107 *_strbyte2code(char *byte, wchar_t *code, int n)
 108 {
 109         char            *endbyte;
 110         wchar_t         *bufp;
 111         static wchar_t  *buf;
 112         static int      bufsize;
 113
 114         if (n < 0)
 115                 for (n = 0; byte[n] != '\0'; ++n)
 116                         ;
 117
 118         if (!code && (n + 1) > bufsize) {
 119                 if (buf)
 120                         free((char *)buf);
 121                 bufsize = n + 1;
 122                 if ((buf = (wchar_t *)malloc(bufsize * sizeof (wchar_t))) ==
 123                     NULL)
 124                         bufsize = 0;
 125         }
 126
 127         if (!code && !buf)
 128                 return (NULL);
 129
 130         bufp = code ? code : buf;
 131         endbyte = byte + n;
 132
 133         while (byte < endbyte && *byte) {
 134                 int             type, width;
 135                 wchar_t         wchar;
 136
 137                 type = TYPE(*byte & 0377);
 138                 width = cswidth[type];
 139                 if (type == 1 || type == 2)
 140                         width++;
 141
 142                 if (byte + width <= endbyte) {
 143                         (void) _curs_mbtowc(&wchar, byte, width);
 144                         *bufp++ = wchar;
 145                 }
 146
 147                 byte += width;
 148         }
 149         *bufp = 0;
 150
 151         return (code ? code : buf);
 152 }