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getservent.c
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C/C++ Source or Header
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1988-07-20
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2KB
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118 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 this notice is preserved and that due credit is given
* to the University of California at 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'' without express or implied warranty.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getservent.c 5.5 (Berkeley) 3/7/88";
#endif /* LIBC_SCCS and not lint */
#include <stdio.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <ctype.h>
#include <netinet/in.h>
#define MAXALIASES 35
static char SERVDB[] = "/etc/services";
static FILE *servf = NULL;
static char line[BUFSIZ+1];
static struct servent serv;
static char *serv_aliases[MAXALIASES];
static char *any();
int _serv_stayopen;
setservent(f)
int f;
{
if (servf == NULL)
servf = fopen(SERVDB, "r" );
else
rewind(servf);
_serv_stayopen |= f;
}
endservent()
{
if (servf) {
fclose(servf);
servf = NULL;
}
_serv_stayopen = 0;
}
struct servent *
getservent()
{
char *p;
register char *cp, **q;
if (servf == NULL && (servf = fopen(SERVDB, "r" )) == NULL)
return (NULL);
again:
if ((p = fgets(line, BUFSIZ, servf)) == NULL)
return (NULL);
if (*p == '#')
goto again;
cp = any(p, "#\n");
if (cp == NULL)
goto again;
*cp = '\0';
serv.s_name = p;
p = any(p, " \t");
if (p == NULL)
goto again;
*p++ = '\0';
while (*p == ' ' || *p == '\t')
p++;
cp = any(p, ",/");
if (cp == NULL)
goto again;
*cp++ = '\0';
serv.s_port = htons((u_short)atoi(p));
serv.s_proto = cp;
q = serv.s_aliases = serv_aliases;
cp = any(cp, " \t");
if (cp != NULL)
*cp++ = '\0';
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q < &serv_aliases[MAXALIASES - 1])
*q++ = cp;
cp = any(cp, " \t");
if (cp != NULL)
*cp++ = '\0';
}
*q = NULL;
return (&serv);
}
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);
}