71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
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/*
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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: lineargb.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: 2000oct03
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* created by: Markus W. Scherer
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*
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* This tool operates on 4-byte GB 18030 codepage sequences. It can
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* - calculate the linear value of such a sequence, with the lowest one,
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* 81 30 81 30, getting value 0
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* - calculate the linear difference between two sequences
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* - calculate a sequence that is linearly offset from another
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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 lineargb.c
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#define LINEAR_18030(a, b, c, d) ((((a)*10+(b))*126L+(c))*10L+(d))
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#define LINEAR_18030_BASE LINEAR_18030(0x81, 0x30, 0x81, 0x30)
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static long
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getLinear(const char *argv[]) {
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unsigned int a, b, c, d;
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a=(unsigned int)strtoul(argv[0], NULL, 16);
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b=(unsigned int)strtoul(argv[1], NULL, 16);
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c=(unsigned int)strtoul(argv[2], NULL, 16);
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d=(unsigned int)strtoul(argv[3], NULL, 16);
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return LINEAR_18030(a, b, c, d);
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}
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extern int
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main(int argc, const char *argv[]) {
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if(argc==5) {
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printf("Linear value: %ld\n", getLinear(argv+1)-LINEAR_18030_BASE);
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return 0;
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} else if(argc==6) {
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int a, b, c, d;
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long linear=getLinear(argv+1)-LINEAR_18030_BASE+strtoul(argv[5], NULL, 0);
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d=(int)(0x30+linear%10); linear/=10;
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c=(int)(0x81+linear%126); linear/=126;
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b=(int)(0x30+linear%10); linear/=10;
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a=(int)(0x81+linear);
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printf("Offset byte sequence: 0x%02x 0x%02x 0x%02x 0x%02x\n",
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a, b, c, d);
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return 0;
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} else if(argc==9) {
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printf("Linear difference: %ld\n", getLinear(argv+5)-getLinear(argv+1));
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return 0;
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} else {
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printf("Usage: %s a b c d [offset | e f g h] calculates with hexadecimal GB 18030 byte values.\n"
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"Just one sequence: prints linear value.\n"
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"Two sequences: prints the linear difference.\n"
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"One sequence and an offset (decimal or with 0x): prints offset byte sequence\n",
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argv[0]);
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return 1;
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}
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}
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