decode block code

decode.c

#include <stdio.h>
#include <string.h>
#include <sys/types.h>

int decodeString(char *str) {
	int res = 0, p10 = 1;
	for(ssize_t i = strlen(str) - 1; i >= 0; --i)
		res += (str[i] - '0') * p10, p10 *= 10;
	return res;
}

int main(int argc, char **argv) {
	char *decryptedBlock = argv[1];
	size_t slen = strlen(decryptedBlock);
	for(ssize_t i = slen - 3; i > -3; i -= 3) {
		decryptedBlock[i + 3] = '\0';
		if(i < 0)
			i = 0;
		printf("dBlock: %s\n", decryptedBlock + i);
		char c = decodeString(decryptedBlock + i);
		printf("c: %d (%c)\n", c, c);
		// do stuff with c
		if(!i)
			break;
	}
	return 0;
}