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Full Discussion: After converting the hexstr to Hex and storing the Hex in a char*
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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LEARN ABOUT OPENSOLARIS

btohex

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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