112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/****************************************************************************
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* tools/b16.c
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* Convert b16 fixed precision value to float or vice versa
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static void show_usage(const char *progname)
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{
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fprintf(stderr, "\nUSAGE: %s <b16_t>|<float>\n", progname);
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fprintf(stderr, "\nWhere:\n");
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fprintf(stderr, " <b16_t>:\n");
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fprintf(stderr, " A b16 fixed precision value in hexadecimal form:\n");
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fprintf(stderr, " E.g., 0x00010000\n");
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fprintf(stderr, " Any value beginning with '0' will be assumed to\n");
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fprintf(stderr, " be in hexadecimal format\n");
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fprintf(stderr, " <float>:\n");
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fprintf(stderr, " A floating point value in standard form:\n");
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fprintf(stderr, " E.g., 5.1\n");
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exit(EXIT_FAILURE);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int main(int argc, char **argv, char **envp)
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{
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double fvalue;
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unsigned long ulvalue;
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long lvalue;
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const char *str;
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char *endptr;
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/* There must be exactly one argument */
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if (argc != 2)
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{
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fprintf(stderr, "\nExpected a single argument\n");
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show_usage(argv[0]);
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}
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str = argv[1];
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/* If the value begins with a zero, we will assume that it is a hexadecimal
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* representation.
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*/
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if (str[0] == '0')
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{
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endptr = NULL;
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ulvalue = strtoul(str, &endptr, 16);
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if (!endptr || *endptr != '\0')
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{
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fprintf(stderr, "\nHexadecimal argument not fully converted\n");
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show_usage(argv[0]);
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}
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if (ulvalue >= 0x80000000)
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{
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lvalue = ~ulvalue + 1;
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}
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else
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{
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lvalue = ulvalue;
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}
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fvalue = ((double)lvalue) / 65536.0;
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printf("0x%08lx -> %10.5f\n", ulvalue, fvalue);
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}
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else
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{
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endptr = NULL;
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fvalue = strtod(str, &endptr);
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if (!endptr || *endptr != '\0')
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{
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fprintf(stderr, "\nFloating point argument not fully converted\n");
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show_usage(argv[0]);
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}
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lvalue = 65536.0 * fvalue;
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printf("%10.5f -> 0x%08lx\n", fvalue, lvalue);
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}
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return 0;
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}
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