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Owen Corpening

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C convert buffer to binary string

// Sometimes one wants to see data in binary
// This method converts an arbitrary buffer to 1's and 0's

#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <string.h>

char *getBufferAsBinaryString(void *in)
{
	int pos=0;
	char result;
	char bitstring[256];
	memset(bitstring, 0, 256);
	unsigned int *input= (unsigned int *)in;
	for(int i=31;i>=0;i--)
	{
		if (((*input >> i) & 1)) result = '1';
		else result = '0';
		bitstring[pos] = result;
		if ((i>0) && ((i)%4)==0)
		{
			pos++;
			bitstring[pos] = ' ';
		}
		pos++;
	}
	return bitstring;
}
int main(int argc, char* argv[])
{
	int i=53003;
	char buffer[1024];
	char *s=getBufferAsBinaryString(&i);
	strcpy(buffer, s);
	printf("%s\n", buffer);
}


produces this output:
0000 0000 0000 0000 1100 1111 0000 1011
to c string convert c++ binary to by ocorpening on May 18, 2006 1 Comments

c C++ convert hex to ascii

// Presented with hex such as 0x12345abc perhaps there is a spot in there
// which represents an ascii char - such as 53 would be 'S'
// Common when dealing with hardware-related data structures and wire
// protocols

#include <stdio.h>
#include <stdlib.h>

/*
*	To convert 53 to the character 'S':
*	char returnVal = hexToString('5', '3');
*/
char hexToAscii(char first, char second)
{
	char hex[5], *stop;
	hex[0] = '0';
	hex[1] = 'x';
	hex[2] = first;
	hex[3] = second;
	hex[4] = 0;
	return strtol(hex, &stop, 16);
}
int main(int argc, char* argv[])
{
	printf("%c\n", hexToAscii('5', '3'));
}

produces this output:
S
to c c++ HEX ascii by ocorpening on May 18, 2006
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