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* resolv/inet_addr.c (inet_aton): Optimize switch statement away.
This commit is contained in:
Ulrich Drepper
1999-04-29 18:20:05 +00:00
parent 61fab08af7
commit 8a40ed6807
4 changed files with 23 additions and 24 deletions
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32
resolv/inet_addr.c
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@ -99,6 +99,7 @@ inet_aton(cp, addr)
const char *cp;
struct in_addr *addr;
{
static const u_int32_t max[4] = { 0xffffffff, 0xffffff, 0xffff, 0xff };
register u_int32_t val; /* changed from u_long --david */
#ifndef _LIBC
register int base;
@ -113,6 +114,8 @@ inet_aton(cp, addr)
__set_errno (0);
#endif
memset (parts, '\0', sizeof (parts));
c = *cp;
for (;;) {
/*
@ -178,33 +181,14 @@ inet_aton(cp, addr)
* the number of parts specified.
*/
n = pp - parts + 1;
switch (n) {
case 0:
goto ret_0; /* initial nondigit */
if (n == 0 /* initial nondigit */
|| parts[0] > 0xff || parts[1] > 0xff || parts[2] > 0xff
|| val > max[n - 1])
goto ret_0;
case 1: /* a -- 32 bits */
break;
val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
case 2: /* a.b -- 8.24 bits */
if (parts[0] > 0xff || val > 0xffffff)
goto ret_0;
val |= parts[0] << 24;
break;
case 3: /* a.b.c -- 8.8.16 bits */
if (parts[0] > 0xff || parts[1] > 0xff || val > 0xffff)
goto ret_0;
val |= (parts[0] << 24) | (parts[1] << 16);
break;
case 4: /* a.b.c.d -- 8.8.8.8 bits */
if (parts[0] > 0xff || parts[1] > 0xff || parts[2] > 0xff
|| val > 0xff)
goto ret_0;
val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
break;
}
if (addr)
addr->s_addr = htonl(val);

1
resolv/inet_pton.c
View File

@ -24,6 +24,7 @@ static char rcsid[] = "$Id$";
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <conf/portability.h>