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Usenet 1994 October
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usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso
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unix
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volume25
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hostcvt
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gethostent.c
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C/C++ Source or Header
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1992-01-03
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3KB
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132 lines
/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <ctype.h>
#ifndef lint
static char *RCSid = "$Id: gethostent.c,v 1.2 90/10/03 22:50:29 rogers Release $";
#endif
/*
* Internet version.
*/
#define MAXALIASES 35
#define MAXADDRSIZE 14
static FILE *hostf = NULL;
static char line[BUFSIZ+1];
static char hostaddr[MAXADDRSIZE];
static struct hostent host;
static char *host_aliases[MAXALIASES];
static char *host_addrs[] = {
hostaddr,
NULL
};
/*
* The following is shared with gethostnamadr.c
*/
static char *any();
#ifdef NOTUSEDINHOSTCVT
mysethostent()
{
if (hostf != NULL)
rewind(hostf);
}
myendhostent()
{
if (hostf != NULL) {
(void)fclose(hostf);
hostf = NULL;
}
}
#endif /* NOTUSEDINHOSTCVT */
struct hostent *
mygethostent(fname)
char *fname;
{
u_long inet_addr();
char *p;
register char *cp, **q;
if (hostf == NULL && (hostf = fopen(fname, "r" )) == NULL)
return (NULL);
again:
if ((p = fgets(line, BUFSIZ, hostf)) == NULL)
return (NULL);
if (*p == '#')
goto again;
cp = any(p, "#\n");
if (cp == NULL)
goto again;
*cp = '\0';
cp = any(p, " \t");
if (cp == NULL)
goto again;
*cp++ = '\0';
/* THIS STUFF IS INTERNET SPECIFIC */
host.h_addr_list = host_addrs;
*((u_long *)host.h_addr) = inet_addr(p);
host.h_length = sizeof (u_long);
host.h_addrtype = AF_INET;
while (*cp == ' ' || *cp == '\t')
cp++;
host.h_name = cp;
q = host.h_aliases = host_aliases;
cp = any(cp, " \t");
if (cp != NULL)
*cp++ = '\0';
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q < &host_aliases[MAXALIASES - 1])
*q++ = cp;
cp = any(cp, " \t");
if (cp != NULL)
*cp++ = '\0';
}
*q = NULL;
return (&host);
}
static char *
any(cp, match)
register char *cp;
char *match;
{
register char *mp, c;
while (c = *cp) {
for (mp = match; *mp; mp++)
if (*mp == c)
return (cp);
cp++;
}
return ((char *)0);
}