NetBSD/sys/lib/libkern/inet_addr.c

131 lines
3.0 KiB
C

/* $NetBSD: inet_addr.c,v 1.1 1997/12/12 20:14:01 gwr Exp $ */
/* Copyright (c) 1996 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
/*
* Derived from:
* src/lib/libc/net/inet_pton.c
*/
#include <sys/types.h>
/*
* Warning - these are not the standard definitions,
* but are the minimum sufficient for this source.
*/
#define isspace(c) (((c) == ' ') || ((c) == '\t') || ((c) == '\n'))
#define isdigit(c) (((c) >= '0') && ((c) <= '9'))
#define isxdigit(c) (((c) >= 'A') && ((c) <= 'F'))
#define toupper(c) ((c) & 0x5f)
/*
* Ascii internet address interpretation routine.
* The value returned is in network order.
*/
u_int32_t
inet_addr(src)
const char *src;
{
u_int32_t val;
int base, n;
unsigned char c;
u_int parts[4];
register u_int *pp = parts;
c = *src;
for (;;) {
/*
* Collect number up to ``.''.
* Values are specified as for C:
* 0x=hex, 0=octal, isdigit=decimal.
*/
if (!isdigit(c))
return (0);
val = 0; base = 10;
if (c == '0') {
c = *++src;
if (toupper(c) == 'X')
base = 16, c = *++src;
else
base = 8;
}
for (;;) {
if (isdigit(c)) {
val = (val * base) + (c - '0');
c = *++src;
} else if (base == 16 && isxdigit(toupper(c))) {
val = (val << 4) |
(toupper(c) + 10 - 'A');
c = *++src;
} else
break;
}
if (c == '.') {
/*
* Internet format:
* a.b.c.d
* a.b.c (with c treated as 16 bits)
* a.b (with b treated as 24 bits)
*/
if (pp >= parts + 3)
return (0);
*pp++ = val;
c = *++src;
} else
break;
}
/*
* Check for trailing characters.
*/
if (c != '\0' && !isspace(c))
return (0);
/*
* Concoct the address according to
* the number of parts specified.
*/
n = pp - parts + 1;
switch (n) {
case 0:
return (0); /* initial nondigit */
case 1: /* a -- 32 bits */
break;
case 2: /* a.b -- 8.24 bits */
if (val > 0xffffff)
return (0);
val |= parts[0] << 24;
break;
case 3: /* a.b.c -- 8.8.16 bits */
if (val > 0xffff)
return (0);
val |= (parts[0] << 24) | (parts[1] << 16);
break;
case 4: /* a.b.c.d -- 8.8.8.8 bits */
if (val > 0xff)
return (0);
val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
break;
}
val = htonl(val);
return (val);
}