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dataspec.c
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<pre>
/*====================================================================*
*
* size_t dataspec (char const * string, void * memory, size_t extent);
*
* memory.h
*
* encode a memory region with a variable-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 semi-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 DATASPEC_SOURCE
#define DATASPEC_SOURCE
#include <ctype.h>
#include <errno.h>
#include "../tools/memory.h"
#include "../tools/number.h"
#include "../tools/error.h"
size_t dataspec (char const * string, void * memory, size_t extent)
{
char const * number = string;
byte * origin = (byte *)(memory);
byte * offset = (byte *)(memory);
if (!number)
{
error (1, EFAULT, "dataspec");
}
#ifdef WIN32
while (isspace (*number))
{
number++;
}
#endif
while ((*number) && (extent))
{
unsigned digit = 0;
#ifdef WIN32
if (isspace (*number))
{
break;
}
#endif
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 (!*number)
{
error (1, EINVAL, "You said '%s' but I want another hex digit", string);
}
if ((digit = todigit (*number++)) >= 0x10)
{
error (1, EINVAL, "You said '%s' but I want valid hex data", string);
}
*offset |= digit;
offset++;
extent--;
}
#ifdef WIN32
while (isspace (*number))
{
number++;
}
#endif
if (*number && !extent)
{
error (1, EINVAL, "'%s' exceeds %d bytes", string, (unsigned)(offset - origin - extent));
}
if (*number)
{
error (1, EINVAL, "String '%s' contains trash", string);
}
return (offset - origin);
}
#endif
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