84 lines
1.6 KiB
C
84 lines
1.6 KiB
C
/* Copyright (C) 2016 Jeremiah Orians
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* This file is part of stage0.
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*
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* stage0 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* stage0 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with stage0. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include<stdio.h>
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#include<stdlib.h>
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#include<stdbool.h>
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void purge_line_comments()
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{
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int c;
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do
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{
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c = getchar();
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if (EOF == c)
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{
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exit(EXIT_SUCCESS);
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}
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} while ( '\n' != c );
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}
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int hex(int c)
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{
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if (c >= '0' && c <= '9')
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{
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return (c - 48);
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}
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else if (c >= 'a' && c <= 'z')
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{
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return (c - 87);
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}
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else if (c >= 'A' && c <= 'Z')
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{
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return (c - 55);
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}
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printf("You managed to call a hex function without a hex value!!!\n");
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exit(EXIT_FAILURE);
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}
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int main(int argc, char *argv[])
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{
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int c;
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int sum = 0;
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bool toggle;
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toggle = false;
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do
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{
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c = getchar();
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if ((c == '#') || (c == ';')) purge_line_comments();
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else if ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
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{
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if(!toggle)
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{
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sum = hex(c);
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toggle = true;
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}
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else
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{
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sum = (sum << 4) + hex(c);
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toggle = false;
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fputc(sum, stdout);
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}
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}
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}while(c != EOF);
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exit(EXIT_SUCCESS);
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}
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