sbc

simple base converter
git clone git://git.bitsmanent.org/sbc
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sbc.c (838B)

      1 /* simple base converter */
      2 
      3 #include <errno.h>
      4 #include <stdio.h>
      5 #include <stdlib.h>
      6 #include <string.h>
      7 
      8 int
      9 main(int argc, char *argv[]) {
     10 	unsigned long n;
     11 	int len, base = 0, i, s;
     12 
     13 	if(argc < 2 || argc > 3) {
     14 		printf("Usage: %s <value> [base]\n", argv[0]);
     15 		return 1;
     16 	}
     17 	if(!strcmp("-v", argv[1])) {
     18 		printf("sbc-%s\n", VERSION);
     19 		return 1;
     20 	}
     21 	if(argv[2])
     22 		base = atoi(argv[2]);
     23 	else {
     24 		len = strlen(argv[1]);
     25 		if(argv[1][len-1] == 'b' && argv[1][1] != 'x')
     26 			base = 2;
     27 	}
     28 	n = strtoul(argv[1], NULL, base);
     29 	if(errno == ERANGE || errno == EINVAL)
     30 		return -1;
     31 	printf("%lu %#04lx %lo ", n, n, n);
     32 	for(s = 64 - 8; s > 0 && !(n >> s); s -= 8);
     33 	for(i = 0; i < 8 && s >= 0; i++) {
     34 		printf("%d", ((n >> s) << i) & 0x80 ? 1 : 0);
     35 		if(i == 8 - 1) {
     36 			s -= 8;
     37 			i = -1;
     38 			printf(" ");
     39 		}
     40 	}
     41 	printf("\n");
     42 	return 0;
     43 }