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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//globals
int bits = 32;
bool raw = false;
void print_help(char *name){
printf("Usage: %s [OPTION]... NUMBER...\n", name);
printf("Convert NUMBER(S) to binary\n\n");
printf("Options:\n");
printf(" -b, --bits\tSpecify number of bits to print (default is 32)\n");
printf(" -h, --help\tPrint this help message and exit\n");
printf(" --raw \tPrint only the binary form\n");
}
char *to_bin(int n, int bits){
char *out = malloc(sizeof(char) * (bits+1));
bool negative = false; //keep track of whether n is negative (and requires 2s compliment notation)
int i;
out[bits] = '\0';
//handle negative numbers
if(n < 0){
n = -1 * (n + 1);
negative = true;
}
for(i = bits-1; i >= 0; --i){
out[i] = (n & 1 ? '1' : '0');
n = n >> 1;
}
//if negative, flip the bits
if(negative){
for(i = 0; i < bits; ++i){
out[i] = 48 + ((out[i] - 47) % 2);
}
}
return out;
}
int main(int argc, char **argv){
int i;
//print help if no arguments
if(argc < 2){
print_help(argv[0]);
return 0;
}
//check for arguments
for(i = 1; i < argc; ++i){
if(!(strcmp(argv[i], "--"))){
++i;
break;
}
else if(!(strcmp(argv[i], "-b")) || !(strcmp(argv[i], "--bits"))){
if(i+1 >= argc) break; //check that the flag was given an argument
bits = atoi(argv[i+1]);
++i;
}
else if(!(strcmp(argv[i], "-h")) || !(strcmp(argv[i], "--help"))) print_help(argv[0]);
else if(!(strcmp(argv[i], "--raw"))) raw = true;
else break;
}
//convert each argument to binary
while(i < argc){
if(!raw) printf("%d -> ", atoi(argv[i]));
printf("%s\n", to_bin(atoi(argv[i]), bits));
++i;
}
}
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