/*====================================================================*
 *
 *   size_t ipv4spec (char const *string,  void * memory);
 *
 *   memory.h
 *
 *   encode a 4-byte memory region with the equivalent of an IPv4 
 *   dotted decimal string; all field delimiters must be present 
 *   but individual fields may have leading zeros or be empty;
 *
 *      0.0.0.0		 0x00, 0x00, 0x00, 0x00   
 *      127...1		 0x7F, 0x00, 0x00, 0x01
 *      192.168.099.000  0xC0, 0xA8, 0x63, 0x00
 *
 *   Motley Tools by Charles Maier <cmaier@cmassoc.net>;
 *   Copyright (c) 2001-2006 by Charles Maier Associates;
 *   Licensed under the Internet Software Consortium License;
 *
 *--------------------------------------------------------------------*/

#ifndef IPV4SPEC_SOURCE
#define IPV4SPEC_SOURCE

#include <ctype.h>

#include "../tools/memory.h"
#include "../tools/number.h"
#include "../tools/error.h"

size_t ipv4spec (char const * string, void * memory) 

{ 
	char const * number = string; 
	byte * origin = (byte *) (memory); 
	byte * offset = (byte *) (memory); 
	byte * extent = offset +  IPv4_LEN; 
	unsigned radix = RADIX_DEC; 
	unsigned digit = 0; 
	while ((* number) && (offset < extent)) 
	{ 
		unsigned value = 0; 
		if (offset > origin) 
		{ 
			if (* number == DEC_EXTENDER) 
			{ 
				number++; 
			} 
		} 
		while ((digit = todigit (* number)) < radix) 
		{ 
			value *= radix; 
			value += digit; 
			if (value >> 8) 
			{ 
				error (1, ERANGE, "IPv4 '%s' octet %d exceeds 8 bits", string, (unsigned) (offset - origin) +  1); 
			} 
			number++; 
		} 
		* offset++ = value; 
	} 

#if defined (WIN32)

	while (isspace ((unsigned char)* number))  
	{ 
		number++; 
	} 

#endif

	if (offset < extent) 
	{ 
		error (1, EINVAL, "IPv4 '%s' has only %d octets", string, (unsigned) (offset - origin)); 
	} 
	if (* number) 
	{ 
		error (1, EINVAL, "IPv4 '%s' contains trash '%s'", string, number); 
	} 
	return (offset - origin); 
} 

/*====================================================================*
 *   demo/test program;
 *--------------------------------------------------------------------*/

#if 0

#include <stdio.h>

char const * program_name = "ipv4spec"; 
int main (int argc, char * argv []) 

{ 
	byte memory [4]; 
	char string [16]; 
	while (* ++ argv) 
	{ 
		ipv4spec (* argv, memory); 
		hexdecode (memory, sizeof (memory), string, sizeof (string)); 
		printf ("%s %s\n", string, * argv); 
	} 
	return (0); 
} 

#endif

/*====================================================================*
 *
 *--------------------------------------------------------------------*/

#endif