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Add an inet_addr() function; return network-order numeric representation

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of an IP address from `aa.bb.cc.dd'-style text input.
This commit is contained in:
thorpej 1995-09-23 17:14:40 +00:00
parent 2572267bae
commit df8c694f7e
2 changed files with 86 additions and 3 deletions
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84
sys/lib/libsa/net.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: net.c,v 1.8 1995/09/18 21:19:30 pk Exp $ */
/* $NetBSD: net.c,v 1.9 1995/09/23 17:14:40 thorpej Exp $ */
/*
* Copyright (c) 1992 Regents of the University of California.
@ -331,6 +331,88 @@ sendrecv(d, sproc, sbuf, ssize, rproc, rbuf, rsize)
}
}
/*
* Like inet_addr() in the C library, but we only accept base-10.
* Return values are in network order.
*/
n_long
inet_addr(cp)
char *cp;
{
register u_long val;
register int n;
register char c;
u_int parts[4];
register u_int *pp = parts;
for (;;) {
/*
* Collect number up to ``.''.
* Values are specified as for C:
* 0x=hex, 0=octal, other=decimal.
*/
val = 0;
while ((c = *cp) != '\0') {
if (c >= '0' && c <= '9') {
val = (val * 10) + (c - '0');
cp++;
continue;
}
break;
}
if (*cp == '.') {
/*
* 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 || val > 0xff)
goto bad;
*pp++ = val, cp++;
} else
break;
}
/*
* Check for trailing characters.
*/
if (*cp != '\0')
goto bad;
/*
* Concoct the address according to
* the number of parts specified.
*/
n = pp - parts + 1;
switch (n) {
case 1: /* a -- 32 bits */
break;
case 2: /* a.b -- 8.24 bits */
if (val > 0xffffff)
goto bad;
val |= parts[0] << 24;
break;
case 3: /* a.b.c -- 8.8.16 bits */
if (val > 0xffff)
goto bad;
val |= (parts[0] << 24) | (parts[1] << 16);
break;
case 4: /* a.b.c.d -- 8.8.8.8 bits */
if (val > 0xff)
goto bad;
val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
break;
}
return (htonl(val));
bad:
return (htonl(INADDR_NONE));
}
char *
inet_ntoa(ia)
struct in_addr ia;

5
sys/lib/libsa/net.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: net.h,v 1.8 1995/09/23 03:31:51 gwr Exp $ */
/* $NetBSD: net.h,v 1.9 1995/09/23 17:14:41 thorpej Exp $ */
/*
* Copyright (c) 1993 Adam Glass
@ -106,7 +106,7 @@ ssize_t readudp __P((struct iodesc *, void *, size_t, time_t));
ssize_t sendrecv __P((struct iodesc *,
ssize_t (*)(struct iodesc *, void *, size_t),
void *, size_t,
ssize_t (*)(struct iodesc *, void *, size_t, time_t),
ssize_t (*)(struct iodesc *, void *, size_t, time_t),
void *, size_t));
/* Utilities: */
@ -114,6 +114,7 @@ char *ether_sprintf __P((u_char *));
int in_cksum __P((void *, int));
char *inet_ntoa __P((struct in_addr));
char *intoa __P((n_long)); /* similar to inet_ntoa */
n_long inet_addr __P((char *));
/* Machine-dependent functions: */
time_t getsecs __P((void));