usr/src/lib/libbc/libc/gen/common/mbtowc.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 /*
  23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*
  28  * mbtowc
  29  */
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32
  33 #if !defined(lint) && defined(SCCSIDS)
  34 static  char *sccsid = "%Z%%M% %I%     %E% SMI";
  35 #endif
  36
  37 #include <stdlib.h>
  38 #include "codeset.h"
  39 #include "mbextern.h"
  40
  41 #undef  mblen
  42
  43 int
  44 mbtowc(pwc, s, n)
  45         wchar_t * pwc;
  46         char *s;
  47         size_t n;
  48 {
  49         char *handle;           /* handle */
  50         int (*p)();
  51         int ret;
  52
  53         switch (_code_set_info.code_id) {
  54         case CODESET_NONE:
  55 #ifdef DEBUG
  56         printf ("DEFAULT: mbtowc invoked\n");
  57 #endif
  58                 /*
  59                  * This is a default code set
  60                  */
  61                  if (s == NULL)
  62                         return (1);
  63                  else {
  64                         if (pwc != NULL)
  65                                 *pwc = (unsigned char)*s;
  66                         return (1);
  67                  }
  68                  break;
  69         case CODESET_EUC:
  70 #ifdef DEBUG
  71         printf ("EUC: mbtowc invoked\n");
  72 #endif
  73                 /*
  74                  * EUC code set
  75                  */
  76                  return(_mbtowc_euc(pwc, s, n));
  77                  break;
  78
  79         case CODESET_XCCS:
  80 #ifdef DEBUG
  81         printf ("XCCS: mbtowc invoked\n");
  82 #endif
  83                 /*
  84                  * XCCS code set
  85                  */
  86                 return(_mbtowc_xccs(pwc, s, n));
  87                 break;
  88
  89         case CODESET_ISO2022:
  90 #ifdef DEBUG
  91         printf ("ISO2022: mbtowc invoked\n");
  92 #endif
  93                 /*
  94                  * ISO family
  95                  */
  96                 return(_mbtowc_iso(pwc, s, n));
  97                 break;
  98
  99         default:
 100                 /*
 101                  * User defined code set
 102                  */
 103                  handle = _ml_open_library();
 104                  if (handle == (char *)NULL)
 105                         return(ERROR_NO_LIB);   /* No user library */
 106                  p = (int (*)()) dlsym(handle, "_mbtowc");
 107                  if (p == (int (*)()) NULL)
 108                         return(ERROR_NO_SYM);
 109                  ret = (*p)(pwc, s, n);
 110                  return (ret);
 111                  break;
 112         }
 113         /* NOTREACHED */
 114 }
 115
 116 int mblen(s, n)
 117 register char *s; int n;
 118 {
 119         int val;
 120
 121         if (_code_set_info.code_id != CODESET_ISO2022)
 122                 return (mbtowc((wchar_t *)0, s, n));
 123         else {
 124                 /*
 125                  * ISO's mbtowc() changes 'states'.
 126                  */
 127                 _savestates();
 128                 val = mbtowc((wchar_t *)0, s, n);
 129                 _restorestates();
 130                 return (val);
 131         }
 132 }