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Top Forums Programming After converting the hexstr to Hex and storing the Hex in a char* Post 302342343 by rvan on Sunday 9th of August 2009 02:24:10 AM
Old 08-09-2009
CPU & Memory After converting the hexstr to Hex and storing the Hex in a char*

Hi All,

My main intension of is to convert the Hexstring stored in a char* into hex and then prefixing it with "0x" and suffix it with ','

This has to be done for all the hexstring char* is NULL.

Store the result prefixed with "0x" and suffixed with ',' in another char* and pass it to another module.

I just want to print and see the values in the result char* to see if it is stored as 0x30, (say when the input char* a = "30" )

How can I verify the values stored in the char*...?

I cannot print it neither as %s nor %x both gives junk values.. %s gives junk because it is hex and %x gives junk because i have formatted with "0x30," i think.. But am not clear and don't know how to check if the values got stored in this format. 0x30,


- Thanks






Code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>


int hexstr2bin(const char *hex_input, char *buf_output, size_t len);
static int hex2byte(const char *hex);
static int hex2num(char c);

main()
{
	int len;
	char* buf;

	const char* hex ="abcd1234567890";

	buf = (char*)malloc(100);

	len = strlen(hex);

	hexstr2bin(hex,buf,len);

	printf("Values in hex %s",buf);
}


int hexstr2bin(const char *hex_input, char *buf_output, size_t len)
{
	size_t i;
	int a;
	const char *ipos = hex;
	char *opos = buf;
	char *prefix = "0x";

	for (i = 0; i < len; i++) {
		a = hex2byte(ipos);
		if (a < 0)
			return -1;
		*opos++ = prefix[0];
		*opos++ = prefix[1];

			
		*opos++ = a;

		
		*opos++ = ',';
		ipos += 2;
	}
	return 0;
}


static int hex2byte(const char *hex)
{
	int a, b;
	a = hex2num(*hex++);
	if (a < 0)
		return -1;
	b = hex2num(*hex++);
	if (b < 0)
		return -1;
	return (a << 4) | b;
}


static int hex2num(char c)
{
	if (c >= '0' && c <= '9')
		return c - '0';
	if (c >= 'a' && c <= 'f')
		return c - 'a' + 10;
	if (c >= 'A' && c <= 'F')
		return c - 'A' + 10;
	return -1;
}

 

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btohex(3TSOL)					       Trusted Extensions Library Functions					     btohex(3TSOL)

NAME
btohex, bsltoh, bcleartoh, bsltoh_r, bcleartoh_r, h_alloc, h_free - convert binary label to hexadecimal SYNOPSIS
cc [flag...] file... -ltsol [library...] #include <tsol/label.h> char *bsltoh(const m_label_t *label); char *bcleartoh(const m_label_t *clearance); char *bsltoh_r(const m_label_t *label, char *hex); char *bcleartoh_r(const m_label_t *clearance, char *hex); char *h_alloc(const unsigned char type); void h_free(char *hex); DESCRIPTION
These functions convert binary labels into hexadecimal strings that represent the internal value. The bsltoh() and bsltoh_r() functions convert a binary sensitivity label into a string of the form: [0xsensitivity_label_hexadecimal_value] The bcleartoh() and bcleartoh_r() functions convert a binary clearance into a string of the form: 0xclearance_hexadecimal_value The h_alloc() function allocates memory for the hexadecimal value type for use by bsltoh_r() and bcleartoh_r(). Valid values for type are: SUN_SL_ID label is a binary sensitivity label. SUN_CLR_ID label is a binary clearance. The h_free() function frees memory allocated by h_alloc(). RETURN VALUES
These functions return a pointer to a string that contains the result of the translation, or (char *)0 if the parameter is not of the required type. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Obsolete | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe with exceptions | +-----------------------------+-----------------------------+ The bsltoh(), bcleartoh(), bsltoh_r(), bcleartoh_r(), h_alloc(), and h_free() functions are Obsolete. Use the label_to_str(3TSOL) function instead. The bsltoh() and bcleartoh() functions share the same statically allocated string storage. They are not MT-Safe. Subsequent calls to any of these functions will overwrite that string with the newly translated string. The bsltoh_r() and bcleartoh_r() functions should be used in multithreaded applications. SEE ALSO
atohexlabel(1M), hextoalabel(1M),label_to_str(3TSOL), libtsol(3LIB), attributes(5), labels(5) NOTES
The functionality described on this manual page is available only if the system is configured with Trusted Extensions. SunOS 5.11 20 Jul 2007 btohex(3TSOL)

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