fluffy/unoct.c

49 lines
780 B
C

/*
* Octal Decoder -- 2012 Zephyr <zephyr@dirtbags.net> This file is in the public domain. I make no promises about the functionality
* of this program.
*/
#include <stdio.h>
int
main(int argc, char *argv[])
{
unsigned char acc = 0;
unsigned char digit = 0;
unsigned long int count = 0;
while (1) {
int c = getchar();
count += 1;
switch (c) {
case EOF:
return 0;
case ' ':
case '\r':
case '\n':
case '\t':
digit += 3;
break;
case '0' ... '7':
acc = (acc * 8) + c - '0';
digit += 1;
break;
default:
if (digit != 0) {
fprintf(stderr, "Warning: non-numeric character mid-octet at offset %lu\n", count);
}
break;
}
if (digit > 3) {
putchar(acc);
acc = 0;
digit = 0;
}
}
return 0;
}