forked from Archive/PX4-Autopilot
122 lines
4.0 KiB
C
122 lines
4.0 KiB
C
/****************************************************************************
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* tools/b16.c
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*
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* Copyright (C) 2007-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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: E.g., 0x00010000\n");
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fprintf(stderr, " Any value begininning with '0' will assumed by be hexadecimal format\n");
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fprintf(stderr, " <float>:\n");
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fprintf(stderr, " A floating value in standard form: 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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