/*====================================================================*
*
* size_t bytespec (char const *string, void * memory, size_t extent);
*
* memory.h
*
* encode a memory region with a fixed-length hexadecimal string;
* return the number of bytes encoded or terminate the program on
* error;
*
* the number of octets in string must equal the memory extent or
* an error will occur; octets may be seperated by colons; empty
* octets are illegal;
*
* Motley Tools by Charles Maier <cmaier@cmassoc.net>;
* Copyright (c) 2001-2006 by Charles Maier Associates;
* Licensed under the Internet Software Consortium License;
*
*--------------------------------------------------------------------*/
#ifndef BYTESPEC_SOURCE
#define BYTESPEC_SOURCE
#include <ctype.h>
#include <errno.h>
#include "../tools/memory.h"
#include "../tools/number.h"
#include "../tools/error.h"
size_t bytespec (char const * string, void * memory, size_t extent)
{
char const * number = string;
byte * origin = (byte *)(memory);
byte * offset = (byte *)(memory);
if (!number)
{
error (1, EINVAL, "bytespec");
}
while (isspace (*number))
{
number++;
}
while ((*number) && (extent))
{
unsigned digit;
if ((offset > origin) && (*number == HEX_EXTENDER))
{
number++;
}
if ((digit = todigit (*number++)) >= RADIX_HEX)
{
error (1, EINVAL, "You said '%s' but I want a hex digit", string);
}
*offset = digit << 4;
if ((digit = todigit (*number++)) >= RADIX_HEX)
{
error (1, EINVAL, "You said '%s' but I want a hex digit", string);
}
*offset |= digit;
offset++;
extent--;
}
while (isspace (*number))
{
number++;
}
if ((*number) || (extent))
{
error (1, EINVAL, "%s is not %d bytes", string, (unsigned)(offset - origin + extent));
}
return (offset - origin);
}
#endif