027e3bb42e
* Added Morse code based RPN calculator * added manual and memory register * fixed morsecalc negative indicator, edited header comment * adjusted stack display controls * Fixed warnings. Added calculator token aliasing ability. Added binary shorthand for numeral entry. Extended morse code binary tree. * ui tweaks * Update movement_config.h * silence warning Co-authored-by: Christian Chapman <user@debian> Co-authored-by: joeycastillo <joeycastillo@utexas.edu>
67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
/*
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* MIT License
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*
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* Copyright (c) 2023 Christian Chapman
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <string.h>
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#include "mc.h"
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/* mc_reset Initialize or reset an MC buffer
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* Input: mc = location of buffer to reset
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*/
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void mc_reset(mc_state_t * mc) {
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memset(mc->b, '\0', BUFFLEN*sizeof(mc->b[0]));
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mc->bidx = 0;
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return;
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return;
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}
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/* mc_input Read an input into a morse code buffer
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* Input: mc = buffer to read into
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* c = character to read into buffer ('.' or '-', ignored otherwise).
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* If the buffer is full, reset it instead of entering the new character.
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*/
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void mc_input(mc_state_t * mc, char c) {
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if(mc->bidx >= BUFFLEN) mc_reset(mc);
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else if( ('.' == c) || ('-' == c) ) {
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mc->b[mc->bidx] = c;
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mc->bidx++;
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}
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return;
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}
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/* mc_dec Decode a Morse code character (descend MC_DEC_KEY[])
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* Input: b = BUFFLEN-length char array with '.'s and '-'s
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* Output: c = Character b represents, or '\0' if not a Morse code.
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*/
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char mc_dec(char b[BUFFLEN]) {
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uint8_t pos = 1; // Binary tree position ('.'=0; '-'=1)
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for(uint8_t idx=0; idx<BUFFLEN; idx++) {
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if('.' == b[idx]) pos = 2*pos; // Descend in . direction
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else if('-' == b[idx]) pos = 2*pos+1; // Descend in - direction
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else break; // End of morse code segment; finished descending
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}
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return MC_DEC_KEY[pos-1];
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}
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