mirror of https://github.com/dirtbags/fluffy.git
51 lines
871 B
C
51 lines
871 B
C
/*
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* Hex Decoder -- 2012 Zephyr <zephyr@dirtbags.net> This file is in the public domain. I make no promises about the functionality
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* of this program.
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*/
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#include <stdio.h>
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int
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main(int argc, char *argv[])
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{
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unsigned char acc = 0;
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unsigned char nybble = 0;
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unsigned long int count = 0;
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while (1) {
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int c = getchar();
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count += 1;
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switch (c) {
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case EOF:
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return 0;
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case '0' ... '9':
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acc = (acc << 4) + c - '0';
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nybble += 1;
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break;
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case 'a' ... 'f':
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acc = (acc << 4) + c - 'a' + 10;
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nybble += 1;
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break;
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case 'A' ... 'F':
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acc = (acc << 4) + c - 'A' + 10;
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nybble += 1;
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break;
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default:
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if (nybble != 0) {
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fprintf(stderr, "Warning: non-hex character mid-octet at offset %lu\n", count);
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}
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break;
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}
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if (nybble == 2) {
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putchar(acc);
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acc = 0;
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nybble = 0;
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}
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}
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return 0;
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}
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