Work on character-sets

diff --git a/include/charmap.h b/include/charmap.h
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+/*
+ * Copyright (c) 1995, Index Data.
+ * 
+ * All rights reserved.
+ * 
+ * Use and redistribution in source or binary form, with or without
+ * modification, of any or all of this software and documentation is
+ * permitted, provided that the following conditions are met:
+ * 
+ * 1. This copyright and permission notice appear with all copies of the
+ * software and its documentation. Notices of copyright or attribution
+ * which appear at the beginning of any file must remain unchanged.
+ * 
+ * 2. The names of Index Data or the individual authors may not be used to
+ * endorse or promote products derived from this software without specific
+ * prior written permission.
+ * 
+ * 3. Source code or binary versions of this software and its
+ * documentation may be used freely in not-for-profit applications. For
+ * profit applications - such as providing for-pay database services,
+ * marketing a product based in whole or in part on this software or its
+ * documentation, or generally distributing this software or its
+ * documentation under a different license - requires a commercial
+ * license from Index Data. The software may be installed and used for
+ * evaluation purposes in conjunction with a commercial application for a
+ * trial period no longer than 60 days.
+ * 
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS, IMPLIED, OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
+ * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
+ * IN NO EVENT SHALL INDEX DATA BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
+ * INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR
+ * NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ *
+ */
+
+#ifndef CHARMAP_H
+#define CHARMAP_H
+
+extern const char *CHR_UNKNOWN;
+extern const char *CHR_SPACE;
+extern const char *CHR_BASE;
+
+struct chr_t_entry;
+typedef struct chr_t_entry chr_t_entry;
+
+typedef struct chrmaptab
+{
+    chr_t_entry *input;         /* mapping table for input data */
+    chr_t_entry *query_equiv;   /* mapping table for queries */
+    unsigned char *output[256]; /* return mapping - for display of registers */
+    int base_uppercase;         /* Start of upper-case ordinals */
+} chrmaptab, *CHRMAPTAB;
+
+chrmaptab *chr_read_maptab(char *name);
+int chr_map_chrs(chr_t_entry *t, char **from, int len, int *read, char **to,
+    int max);
+char **chr_map_input(chr_t_entry *t, char **from, int len);
+
+#endif