104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 2000, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: gbsingle.c
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2000oct26
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* created by: Markus W. Scherer
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*
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* This tool reads a mapping table in a very simple format with combined syntax
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* for mappings from Unicode to GB 18030 and back and turns it into
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* a single-direction file with only either mapping direction.
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* The input format is as follows:
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* unicode [':' | '>'] codepage ['*']
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* With
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* unicode = hexadecimal number 0..10ffff
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* codepage = hexadecimal number 0..ffffffff for big-endian bytes
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* ':' for roundtrip mappings
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* '>' for fallbacks from Unicode to codepage
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* '*' ignored
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*
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* The output format is as follows:
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* With no command line argument:
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* unicode ':' codepage
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* With a "gb" command line argument:
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* codepage ':' unicode
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*
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* To compile, just call a C compiler/linker with this source file.
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* On Windows: cl gbsingle.c
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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extern int
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main(int argc, const char *argv[]) {
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char line[200];
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char *end;
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unsigned long c, b;
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unsigned char fallback;
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char uniToGB;
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if(argc<=1) {
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puts("# Unicode:GB 18030");
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uniToGB=1;
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} else if(0==strcmp(argv[1], "gb")) {
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puts("# GB 18030:Unicode");
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uniToGB=0;
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} else {
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fprintf(stderr, "unknown argument %s\n", argv[1]);
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return 2;
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}
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/* parse the input file from stdin */
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while(gets(line)!=NULL) {
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/* pass through empty and comment lines */
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if(line[0]==0 || line[0]=='#' || line[0]==0x1a) {
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puts(line);
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continue;
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}
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/* end of code points, beginning of ranges? */
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if(0==strcmp(line, "ranges")) {
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break; /* ignore the rest of the file */
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}
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/* read Unicode code point */
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c=strtoul(line, &end, 16);
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if(end==line || *end!=':' && *end!='>') {
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fprintf(stderr, "error parsing code point from \"%s\"\n", line);
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return 1;
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}
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if(*end==':') {
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fallback=0;
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} else {
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fallback=1;
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}
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/* read byte sequence as one long value */
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b=strtoul(end+1, &end, 16);
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if(*end!=0 && *end!='*') {
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fprintf(stderr, "error parsing byte sequence from \"%s\"\n", line);
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return 1;
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}
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if(uniToGB) {
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/* output Unicode:GB 18030 including fallbacks */
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printf("%04lx:%02lx\n", c, b);
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} else if(!fallback) {
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/* output GB 18030:Unicode excluding fallbacks */
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printf("%02lx:%04lx\n", b, c);
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}
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}
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return 0;
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}
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