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ipv4spec.c
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/*====================================================================*
*
* 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
*
*. released 2005 by charles maier associates ltd. for public use;
*: compiled on debian gnu/linux with gcc 2.95 compiler;
*; licensed under the gnu public license version two;
*
*--------------------------------------------------------------------*/
#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 (*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
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