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/*
* This file has been modified for the cdrkit suite.
*
* The behaviour and appearence of the program code below can differ to a major
* extent from the version distributed by the original author(s).
*
* For details, see Changelog file distributed with the cdrkit package. If you
* received this file from another source then ask the distributing person for
* a log of modifications.
*
*/
/* @(#)nls_file.c 1.3 05/05/01 2000 J. Schilling */
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; see the file COPYING. If not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
* Modifications to make the code portable Copyright (c) 2000 J. Schilling
*
* nls_file: create a charset table from a input table file
* from the Unicode Organization (www.unicode.org).
* The Unicode to charset table has only exact mappings.
*
* Only reads single byte to word matches.
*
* James Pearson (j.pearson@ge.ucl.ac.uk) 16-Aug-2000
*/
#include <mconfig.h>
#include <stdio.h>
#include <stdxlib.h>
#include <strdefs.h>
#include <libport.h>
#include "nls.h"
#define NUM 256
static void free_mem(struct unls_unicode *, unsigned char **);
static void
free_mem(struct unls_unicode *charset2uni, unsigned char **page_uni2charset)
{
int i;
if (charset2uni)
free(charset2uni);
if (page_uni2charset) {
for (i = 0; i < NUM; i++) {
if (page_uni2charset[i]) {
free(page_uni2charset[i]);
}
}
free(page_uni2charset);
}
}
int
init_unls_file(char *filename)
{
FILE *fp;
struct unls_unicode *charset2uni = NULL;
unsigned char **page_uni2charset = NULL;
char buf[1024];
char *p;
unsigned int cp, uc;
struct unls_table *table;
int i, ok = 0;
/* give up if no filename is given */
if (filename == NULL)
return (-1);
/*
* see if we already have a table with this name - built in tables
* have precedence of file tables - i.e. can't have the name of an
* existing table. Also, we may have already registered this file table
*/
if (find_unls(filename) != NULL)
return (-1);
if ((fp = fopen(filename, "r")) == NULL)
return (-1);
/* allocate memory for the forward conversion table */
if ((charset2uni = (struct unls_unicode *)
malloc(sizeof (struct unls_unicode) * NUM)) == NULL) {
free_mem(charset2uni, page_uni2charset);
return (-1);
}
/* any unknown character should be mapped to NULL */
memset(charset2uni, 0, sizeof (struct unls_unicode) * NUM);
/*
* some source files don't set the control characters 0x00 - 0x1f
* so set these by default
*/
for (i = 0; i < 32; i++) {
charset2uni[i].unls_low = i;
}
/* also set DELETE (0x7f) by default */
charset2uni[0x7f].unls_low = 0x7f;
/* read each line of the file */
while (fgets(buf, sizeof (buf), fp) != NULL) {
/* cut off any comments */
if ((p = strchr(buf, '#')) != NULL)
*p = '\0';
/* look for two hex values */
if (sscanf(buf, "%x%x", &cp, &uc) == 2) {
/* if they are not in range - fail */
if (cp > 0xff || uc > 0xffff) {
continue;
}
/* set the Unicode value for the given code point */
charset2uni[cp].unls_low = uc & 0xff;
charset2uni[cp].unls_high = (uc >> 8) & 0xff;
/* make sure we find at least one pair ... */
ok = 1;
}
}
fclose(fp);
if (!ok) {
/* we haven't found anything ... */
free_mem(charset2uni, page_uni2charset);
return (-1);
}
/* allocate memory for the reverse table */
if ((page_uni2charset = (unsigned char **)
malloc(sizeof (unsigned char *) * NUM)) == NULL) {
free_mem(charset2uni, page_uni2charset);
return (-1);
}
memset(page_uni2charset, 0, sizeof (unsigned char *) * NUM);
/* loop through the forward table, setting the reverse value */
for (i = 0; i < NUM; i++) {
uc = charset2uni[i].unls_high;
cp = charset2uni[i].unls_low;
/* if the page doesn't exist, create a page */
if (page_uni2charset[uc] == NULL) {
if ((page_uni2charset[uc] =
(unsigned char *) malloc(NUM)) == NULL) {
free_mem(charset2uni, page_uni2charset);
return (-1);
}
memset(page_uni2charset[uc], 0, NUM);
}
/* set the reverse point in the page */
page_uni2charset[uc][cp] = i;
}
/* set up the table */
if ((table = (struct unls_table *)malloc(sizeof (struct unls_table)))
== NULL) {
free_mem(charset2uni, page_uni2charset);
return (-1);
}
/* give the table the file name, so we can find it again if needed */
table->unls_name = strdup(filename);
table->unls_uni2cs = page_uni2charset;
table->unls_cs2uni = charset2uni;
table->unls_next = NULL;
/* register the table */
return (register_unls(table));
}
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