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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2010 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
#include <ast.h>
#include <ctype.h>
/*
* convert string to 4 byte local byte order ip address
* with optional prefix bits
* pointer to first unused char placed in *e, even on error
* return 0:ok <0:error
*
* valid addresses match the egrep RE:
*
* [0-9]{1,3}(\.[0-9]{1,3})*|0[xX][0-9a-fA-Z]+
*
* valid bits/masks match the egrep RE:
*
* (/([0-9]+|[0-9]{1,3}(\.[0-9]{1,3})*))?
*
* if pbits!=0 and no bits/mask specified then trailing 0's in addr
* are used to compute the mask
*/
int
strtoip4(register const char* s, char** e, uint32_t* paddr, unsigned char* pbits)
{
register int c;
register unsigned int n;
register uint32_t addr;
register int part;
register unsigned char bits;
uint32_t z;
int old;
int r;
const char* b;
r = -1;
while (isspace(*s))
s++;
b = s;
addr = 0;
bits = 0;
part = 0;
do
{
n = 0;
while ((c = *s++) >= '0' && c <= '9')
n = n * 10 + (c - '0');
if ((c == 'x' || c == 'X') && !part)
{
addr = n;
for (;;)
{
if ((c = *s++) >= '0' && c <= '9')
c -= '0';
else if (c >= 'a' && c <= 'f')
c -= 'a' - 10;
else if (c >= 'A' && c <= 'F')
c -= 'F' - 10;
else
break;
addr = addr * 16 + c;
}
part = 4;
break;
}
if (n > 0xff)
goto done;
addr = (addr << 8) | n;
part++;
} while (c == '.');
if ((s - b) == 1 && c != '/' || part > 4)
goto done;
if (old = part < 4)
while (part++ < 4)
addr <<= 8;
if (pbits)
{
if (c == '/')
{
part = 0;
z = 0;
for (;;)
{
n = 0;
while ((c = *s++) >= '0' && c <= '9')
n = n * 10 + (c - '0');
z = (z << 8) | n;
part++;
if (c != '.')
break;
old = 1;
}
if (part > 4)
goto done;
if (z <= 32 && (!old || part < 2))
bits = z;
else if (z)
{
if (part == 4 && (z & 0x8000001) == 1)
z = ~z;
while (!(z & 1))
z >>= 1;
while (z & 1)
{
z >>= 1;
bits++;
}
}
}
else if ((z = (addr >> 24)) < 128)
bits = 8;
else if (z < 192)
bits = 16;
else
bits = 24;
if (*pbits = bits)
addr &= ~((((uint32_t)1)<<(32-bits))-1);
else
addr = 0;
}
if (paddr)
*paddr = addr;
r = 0;
done:
if (e)
*e = (char*)(s - 1);
return r;
}
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