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Turnbull China Bikeride
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Turnbull China Bikeride - Disc 2.iso
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NETLIB00
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NetLib
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proto
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1995-01-12
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4KB
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209 lines
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "netdb.h"
#include "netinet/in.h"
#include "sys/socket.h"
#include "socketlib.h"
/*
* File handle for the protocols file
*/
static FILE *protofile = NULL;
/*
* Keep the file open between calls to these routines?
*/
static int keepopen = 0;
/*
* Local routines
*/
static int __setprotoent(int allowrewind);
static struct protoent *__getprotoent(void);
/*
* Open and rewind the protocols file
*/
int setprotoent(int stayopen)
{
/* Record whether the file should be kept open */
keepopen = stayopen;
return __setprotoent(1);
}
/*
* Do the real work of opening/rewinding the protocols file
*/
static int __setprotoent(int allowrewind)
{
/* Open or rewind the file as necessary */
if (protofile) {
if (allowrewind)
rewind(protofile);
} else {
protofile = fopen("InetDBase:Protocols", "r");
}
return (protofile == NULL) ? -1 : 0;
}
/*
* Fetch the next entry from the protocols file
*/
struct protoent *getprotoent()
{
struct protoent *proto;
/* Open the file if necessary */
if (protofile == NULL)
if (__setprotoent(0) == -1)
return NULL;
/* Do the actual read */
proto = __getprotoent();
/* Close the file unless the user has prohibited it */
if (!keepopen)
endprotoent();
return proto;
}
/*
* Do the real work of getting an entry from the file
*/
struct protoent *__getprotoent()
{
static struct protoent proto = {
NULL, NULL, 0
};
char **item;
char *line;
char *element;
int aliases;
/* Free up any memory in use */
if (proto.p_name) {
for (item = proto.p_aliases; *item; item++)
free(*item);
free(proto.p_name);
free(proto.p_aliases);
proto.p_name = NULL;
}
/* Read a line from the file */
if ((line = __socketlib_readline(protofile)) == NULL)
return NULL;
/* Extract the offical protocol name from the line */
element = strtok(line, " \t");
proto.p_name = strdup(element);
/* Extract the port number from the line */
element = strtok(NULL, " \t");
proto.p_proto = atoi(element);
/* Initialise the alias list */
proto.p_aliases = malloc(sizeof(char *));
proto.p_aliases[0] = NULL;
aliases = 1;
/* Extract the aliases */
while ((element = strtok(NULL, " \t")) != NULL)
{
aliases += 1;
proto.p_aliases = realloc(proto.p_aliases, aliases * sizeof(char *));
proto.p_aliases[aliases-2] = strdup(element);
proto.p_aliases[aliases-1] = NULL;
}
return &proto;
}
/*
* Close the protocols file
*/
int endprotoent()
{
int status = 0;
/* If its open, close it */
if (protofile) {
status = fclose(protofile);
protofile = 0;
}
return status;
}
/*
* Search the protocols file for a given protocol name
*/
struct protoent *getprotobyname(const char *name)
{
struct protoent *proto;
char **alias;
/* Open/rewind the file */
if (__setprotoent(1) == -1)
return NULL;
/* Look through the file for a match */
while ((proto = __getprotoent()) != NULL) {
/* Does the offical name match? */
if (strcmp(proto->p_name, name) == 0)
break;
/* Do any of the aliases match? */
for (alias = proto->p_aliases; *alias; alias++)
{
if (strcmp(*alias, name) == 0)
break;
}
/* Did any of the aliases match? */
if (*alias)
break;
}
/* Close the file unless the user has prohibited it */
if (!keepopen)
endprotoent();
return proto;
}
/*
* Search the protocols file for a given number
*/
struct protoent *getprotobynumber(int protonum)
{
struct protoent *proto;
/* Open/rewind the file */
if (__setprotoent(1) == -1)
return NULL;
/* Look through the file for a match */
while ((proto = __getprotoent()) != NULL) {
/* If the protocol number matches, we've found it */
if (proto->p_proto == protonum)
break;
}
/* Close the file unless the user has prohibited it */
if (!keepopen)
endprotoent();
return proto;
}