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guile/libguile/win32-socket.c
Stefan Jahn 6063dc1ddd 2001-11-21 Stefan Jahn <stefan@lkcc.org> 
* win32-socket.c (getservent, setservent, endservent,
        getprotoent, setprotoent, endprotoent): New functions.
        Appropriate replacements for M$-Windows.

        * numbers.c (SIZE_MAX, PTRDIFF_MAX, PTRDIFF_MIN): Reintroduced
        these definitions for GUILE_DEBUG.

        * net_db.c: Include "win32-socket.h" if compiling with a native
        M$-Windows compiler.  Include some pieces of code (protoent and
        servent interface) protected by HAVE_* macros when using a
        native M$-Windows compiler.
2001-11-21 07:59:53 +00:00

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/* Copyright (C) 2001 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
#include "libguile/__scm.h"
#include "libguile/modules.h"
#include "libguile/numbers.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#ifndef PATH_MAX
#define PATH_MAX 255
#endif
#include "win32-socket.h"
/* Winsock API error description structure. The error description is
necessary because there is no error list available. */
typedef struct
{
int error; /* Error code. */
char *str; /* Error description. */
int replace; /* Possible error code replacement. */
char *replace_str; /* Replacement symbol. */
char *correct_str; /* Original symbol. */
}
socket_error_t;
#define FILE_ETC_SERVICES "services"
#define ENVIRON_ETC_SERVICES "SERVICES"
#define FILE_ETC_NETWORKS "networks"
#define ENVIRON_ETC_NETWORKS "NETWORKS"
#define FILE_ETC_PROTOCOLS "protocol"
#define ENVIRON_ETC_PROTOCOLS "PROTOCOLS"
#define MAX_NAMLEN 256
#define MAX_ALIASES 4
/* Internal structure for a thread's M$-Windows servent interface. */
typedef struct
{
FILE *fd; /* Current file. */
char file[PATH_MAX]; /* File name. */
struct servent ent; /* Return value. */
char name[MAX_NAMLEN]; /* Service name. */
char proto[MAX_NAMLEN]; /* Protocol name. */
char alias[MAX_ALIASES][MAX_NAMLEN]; /* All aliases. */
char *aliases[MAX_ALIASES]; /* Alias pointers. */
int port; /* Network port. */
}
scm_i_servent_t;
static scm_i_servent_t scm_i_servent;
/* Internal structure for a thread's M$-Windows protoent interface. */
typedef struct
{
FILE *fd; /* Current file. */
char file[PATH_MAX]; /* File name. */
struct protoent ent; /* Return value. */
char name[MAX_NAMLEN]; /* Protocol name. */
char alias[MAX_ALIASES][MAX_NAMLEN]; /* All aliases. */
char *aliases[MAX_ALIASES]; /* Alias pointers. */
int proto; /* Protocol number. */
}
scm_i_protoent_t;
static scm_i_protoent_t scm_i_protoent;
/* Define replacement symbols for most of the WSA* error codes. */
#ifndef EWOULDBLOCK
# define EWOULDBLOCK WSAEWOULDBLOCK
#endif
#ifndef EINPROGRESS
# define EINPROGRESS WSAEINPROGRESS
#endif
#ifndef EALREADY
# define EALREADY WSAEALREADY
#endif
#ifndef EDESTADDRREQ
# define EDESTADDRREQ WSAEDESTADDRREQ
#endif
#ifndef EMSGSIZE
# define EMSGSIZE WSAEMSGSIZE
#endif
#ifndef EPROTOTYPE
# define EPROTOTYPE WSAEPROTOTYPE
#endif
#ifndef ENOTSOCK
# define ENOTSOCK WSAENOTSOCK
#endif
#ifndef ENOPROTOOPT
# define ENOPROTOOPT WSAENOPROTOOPT
#endif
#ifndef EPROTONOSUPPORT
# define EPROTONOSUPPORT WSAEPROTONOSUPPORT
#endif
#ifndef ESOCKTNOSUPPORT
# define ESOCKTNOSUPPORT WSAESOCKTNOSUPPORT
#endif
#ifndef EOPNOTSUPP
# define EOPNOTSUPP WSAEOPNOTSUPP
#endif
#ifndef EPFNOSUPPORT
# define EPFNOSUPPORT WSAEPFNOSUPPORT
#endif
#ifndef EAFNOSUPPORT
# define EAFNOSUPPORT WSAEAFNOSUPPORT
#endif
#ifndef EADDRINUSE
# define EADDRINUSE WSAEADDRINUSE
#endif
#ifndef EADDRNOTAVAIL
# define EADDRNOTAVAIL WSAEADDRNOTAVAIL
#endif
#ifndef ENETDOWN
# define ENETDOWN WSAENETDOWN
#endif
#ifndef ENETUNREACH
# define ENETUNREACH WSAENETUNREACH
#endif
#ifndef ENETRESET
# define ENETRESET WSAENETRESET
#endif
#ifndef ECONNABORTED
# define ECONNABORTED WSAECONNABORTED
#endif
#ifndef ECONNRESET
# define ECONNRESET WSAECONNRESET
#endif
#ifndef ENOBUFS
# define ENOBUFS WSAENOBUFS
#endif
#ifndef EISCONN
# define EISCONN WSAEISCONN
#endif
#ifndef ENOTCONN
# define ENOTCONN WSAENOTCONN
#endif
#ifndef ESHUTDOWN
# define ESHUTDOWN WSAESHUTDOWN
#endif
#ifndef ETOOMANYREFS
# define ETOOMANYREFS WSAETOOMANYREFS
#endif
#ifndef ETIMEDOUT
# define ETIMEDOUT WSAETIMEDOUT
#endif
#ifndef ECONNREFUSED
# define ECONNREFUSED WSAECONNREFUSED
#endif
#ifndef ELOOP
# define ELOOP WSAELOOP
#endif
#ifndef EHOSTDOWN
# define EHOSTDOWN WSAEHOSTDOWN
#endif
#ifndef EHOSTUNREACH
# define EHOSTUNREACH WSAEHOSTUNREACH
#endif
#ifndef EPROCLIM
# define EPROCLIM WSAEPROCLIM
#endif
#ifndef EUSERS
# define EUSERS WSAEUSERS
#endif
#ifndef EDQUOT
# define EDQUOT WSAEDQUOT
#endif
#ifndef ESTALE
# define ESTALE WSAESTALE
#endif
#ifndef EREMOTE
# define EREMOTE WSAEREMOTE
#endif
/* List of error structures. */
static socket_error_t socket_errno [] = {
/* 000 */ { 0, NULL, 0, NULL, NULL },
/* 001 */ { 0, NULL, 0, NULL, NULL },
/* 002 */ { 0, NULL, 0, NULL, NULL },
/* 003 */ { 0, NULL, 0, NULL, NULL },
/* 004 */ { WSAEINTR, "Interrupted function call", EINTR, NULL, "WSAEINTR" },
/* 005 */ { 0, NULL, 0, NULL, NULL },
/* 006 */ { 0, NULL, 0, NULL, NULL },
/* 007 */ { 0, NULL, 0, NULL, NULL },
/* 008 */ { 0, NULL, 0, NULL, NULL },
/* 009 */ { WSAEBADF, "Bad file number", EBADF, NULL, "WSAEBADF" },
/* 010 */ { 0, NULL, 0, NULL, NULL },
/* 011 */ { 0, NULL, 0, NULL, NULL },
/* 012 */ { 0, NULL, 0, NULL, NULL },
/* 013 */ { WSAEACCES, "Permission denied", EACCES, NULL, "WSAEACCES" },
/* 014 */ { WSAEFAULT, "Bad address", EFAULT, NULL, "WSAEFAULT" },
/* 015 */ { 0, NULL, 0, NULL, NULL },
/* 016 */ { 0, NULL, 0, NULL, NULL },
/* 017 */ { 0, NULL, 0, NULL, NULL },
/* 018 */ { 0, NULL, 0, NULL, NULL },
/* 019 */ { 0, NULL, 0, NULL, NULL },
/* 020 */ { 0, NULL, 0, NULL, NULL },
/* 021 */ { 0, NULL, 0, NULL, NULL },
/* 022 */ { WSAEINVAL, "Invalid argument", EINVAL, NULL, "WSAEINVAL" },
/* 023 */ { 0, NULL, 0, NULL, NULL },
/* 024 */ { WSAEMFILE, "Too many open files", EMFILE, NULL, "WSAEMFILE" },
/* 025 */ { 0, NULL, 0, NULL, NULL },
/* 026 */ { 0, NULL, 0, NULL, NULL },
/* 027 */ { 0, NULL, 0, NULL, NULL },
/* 028 */ { 0, NULL, 0, NULL, NULL },
/* 029 */ { 0, NULL, 0, NULL, NULL },
/* 030 */ { 0, NULL, 0, NULL, NULL },
/* 031 */ { 0, NULL, 0, NULL, NULL },
/* 032 */ { 0, NULL, 0, NULL, NULL },
/* 033 */ { 0, NULL, 0, NULL, NULL },
/* 034 */ { 0, NULL, 0, NULL, NULL },
/* 035 */ { WSAEWOULDBLOCK, "Resource temporarily unavailable",
EWOULDBLOCK, "EWOULDBLOCK", "WSAEWOULDBLOCK" },
/* 036 */ { WSAEINPROGRESS, "Operation now in progress",
EINPROGRESS, "EINPROGRESS", "WSAEINPROGRESS" },
/* 037 */ { WSAEALREADY, "Operation already in progress",
EALREADY, "EALREADY", "WSAEALREADY" },
/* 038 */ { WSAENOTSOCK, "Socket operation on non-socket",
ENOTSOCK, "ENOTSOCK", "WSAENOTSOCK"},
/* 039 */ { WSAEDESTADDRREQ, "Destination address required",
EDESTADDRREQ, "EDESTADDRREQ", "WSAEDESTADDRREQ" },
/* 040 */ { WSAEMSGSIZE, "Message too long",
EMSGSIZE, "EMSGSIZE", "WSAEMSGSIZE" },
/* 041 */ { WSAEPROTOTYPE, "Protocol wrong type for socket",
EPROTOTYPE, "EPROTOTYPE", "WSAEPROTOTYPE" },
/* 042 */ { WSAENOPROTOOPT, "Bad protocol option",
ENOPROTOOPT, "ENOPROTOOPT", "WSAENOPROTOOPT" },
/* 043 */ { WSAEPROTONOSUPPORT, "Protocol not supported",
EPROTONOSUPPORT, "EPROTONOSUPPORT", "WSAEPROTONOSUPPORT" },
/* 044 */ { WSAESOCKTNOSUPPORT, "Socket type not supported",
ESOCKTNOSUPPORT, "ESOCKTNOSUPPORT", "WSAESOCKTNOSUPPORT" },
/* 045 */ { WSAEOPNOTSUPP, "Operation not supported",
EOPNOTSUPP, "EOPNOTSUPP", "WSAEOPNOTSUPP" },
/* 046 */ { WSAEPFNOSUPPORT, "Protocol family not supported",
EPFNOSUPPORT, "EPFNOSUPPORT", "WSAEPFNOSUPPORT" },
/* 047 */ { WSAEAFNOSUPPORT,
"Address family not supported by protocol family",
EAFNOSUPPORT, "EAFNOSUPPORT", "WSAEAFNOSUPPORT" },
/* 048 */ { WSAEADDRINUSE, "Address already in use",
EADDRINUSE, "EADDRINUSE", "WSAEADDRINUSE" },
/* 049 */ { WSAEADDRNOTAVAIL, "Cannot assign requested address",
EADDRNOTAVAIL, "EADDRNOTAVAIL", "WSAEADDRNOTAVAIL" },
/* 050 */ { WSAENETDOWN, "Network is down",
ENETDOWN, "ENETDOWN", "WSAENETDOWN" },
/* 051 */ { WSAENETUNREACH, "Network is unreachable",
ENETUNREACH, "ENETUNREACH", "WSAENETUNREACH" },
/* 052 */ { WSAENETRESET, "Network dropped connection on reset",
ENETRESET, "ENETRESET", "WSAENETRESET" },
/* 053 */ { WSAECONNABORTED, "Software caused connection abort",
ECONNABORTED, "ECONNABORTED", "WSAECONNABORTED" },
/* 054 */ { WSAECONNRESET, "Connection reset by peer",
ECONNRESET, "ECONNRESET", "WSAECONNRESET" },
/* 055 */ { WSAENOBUFS, "No buffer space available",
ENOBUFS, "ENOBUFS", "WSAENOBUFS" },
/* 056 */ { WSAEISCONN, "Socket is already connected",
EISCONN, "EISCONN", "WSAEISCONN" },
/* 057 */ { WSAENOTCONN, "Socket is not connected",
ENOTCONN, "ENOTCONN", "WSAENOTCONN" },
/* 058 */ { WSAESHUTDOWN, "Cannot send after socket shutdown",
ESHUTDOWN, "ESHUTDOWN", "WSAESHUTDOWN" },
/* 059 */ { WSAETOOMANYREFS, "Too many references; can't splice",
ETOOMANYREFS, "ETOOMANYREFS", "WSAETOOMANYREFS" },
/* 060 */ { WSAETIMEDOUT, "Connection timed out",
ETIMEDOUT, "ETIMEDOUT", "WSAETIMEDOUT" },
/* 061 */ { WSAECONNREFUSED, "Connection refused",
ECONNREFUSED, "ECONNREFUSED", "WSAECONNREFUSED" },
/* 062 */ { WSAELOOP, "Too many levels of symbolic links",
ELOOP, "ELOOP", "WSAELOOP" },
/* 063 */ { WSAENAMETOOLONG, "File name too long",
ENAMETOOLONG, NULL, "WSAENAMETOOLONG" },
/* 064 */ { WSAEHOSTDOWN, "Host is down",
EHOSTDOWN, "EHOSTDOWN", "WSAEHOSTDOWN" },
/* 065 */ { WSAEHOSTUNREACH, "No route to host",
EHOSTUNREACH, "EHOSTUNREACH", "WSAEHOSTUNREACH" },
/* 066 */ { WSAENOTEMPTY, "Directory not empty",
ENOTEMPTY, NULL, "WSAENOTEMPTY" },
/* 067 */ { WSAEPROCLIM, "Too many processes",
EPROCLIM, "EPROCLIM", "WSAEPROCLIM" },
/* 068 */ { WSAEUSERS, "Too many users",
EUSERS, "EUSERS", "WSAEUSERS" },
/* 069 */ { WSAEDQUOT, "Disc quota exceeded",
EDQUOT, "EDQUOT", "WSAEDQUOT" },
/* 070 */ { WSAESTALE, "Stale NFS file handle",
ESTALE, "ESTALE", "WSAESTALE" },
/* 071 */ { WSAEREMOTE, "Too many levels of remote in path",
EREMOTE, "EREMOTE", "WSAEREMOTE" },
/* 072 */ { 0, NULL, 0, NULL, NULL },
/* 073 */ { 0, NULL, 0, NULL, NULL },
/* 074 */ { 0, NULL, 0, NULL, NULL },
/* 075 */ { 0, NULL, 0, NULL, NULL },
/* 076 */ { 0, NULL, 0, NULL, NULL },
/* 077 */ { 0, NULL, 0, NULL, NULL },
/* 078 */ { 0, NULL, 0, NULL, NULL },
/* 079 */ { 0, NULL, 0, NULL, NULL },
/* 080 */ { 0, NULL, 0, NULL, NULL },
/* 081 */ { 0, NULL, 0, NULL, NULL },
/* 082 */ { 0, NULL, 0, NULL, NULL },
/* 083 */ { 0, NULL, 0, NULL, NULL },
/* 084 */ { 0, NULL, 0, NULL, NULL },
/* 085 */ { 0, NULL, 0, NULL, NULL },
/* 086 */ { 0, NULL, 0, NULL, NULL },
/* 087 */ { 0, NULL, 0, NULL, NULL },
/* 088 */ { 0, NULL, 0, NULL, NULL },
/* 089 */ { 0, NULL, 0, NULL, NULL },
/* 090 */ { 0, NULL, 0, NULL, NULL },
/* 091 */ { WSASYSNOTREADY, "Network subsystem is unavailable",
0, NULL, "WSASYSNOTREADY" },
/* 092 */ { WSAVERNOTSUPPORTED, "WINSOCK.DLL version out of range",
0, NULL, "WSAVERNOTSUPPORTED" },
/* 093 */ { WSANOTINITIALISED, "Successful WSAStartup not yet performed",
0, NULL, "WSANOTINITIALISED" },
/* 094 */ { 0, NULL, 0, NULL, NULL },
/* 095 */ { 0, NULL, 0, NULL, NULL },
/* 096 */ { 0, NULL, 0, NULL, NULL },
/* 097 */ { 0, NULL, 0, NULL, NULL },
/* 098 */ { 0, NULL, 0, NULL, NULL },
/* 099 */ { 0, NULL, 0, NULL, NULL },
/* 100 */ { 0, NULL, 0, NULL, NULL },
/* 101 */ { WSAEDISCON, "Graceful shutdown in progress",
0, NULL, "WSAEDISCON" },
/* 102 */ { WSAENOMORE, "No more services",
0, NULL, "WSAENOMORE" },
/* 103 */ { WSAECANCELLED, "Service lookup cancelled",
0, NULL, "WSAECANCELLED" },
/* 104 */ { WSAEINVALIDPROCTABLE, "Invalid procedure call table",
0, NULL, "WSAEINVALIDPROCTABLE" },
/* 105 */ { WSAEINVALIDPROVIDER, "Invalid service provider",
0, NULL, "WSAEINVALIDPROVIDER" },
/* 106 */ { WSAEPROVIDERFAILEDINIT, "Service provider failure",
0, NULL, "WSAEPROVIDERFAILEDINIT" },
/* 107 */ { WSASYSCALLFAILURE, "System call failed",
0, NULL, "WSASYSCALLFAILURE" },
/* 108 */ { WSASERVICE_NOT_FOUND, "No such service",
0, NULL, "WSASERVICE_NOT_FOUND" },
/* 109 */ { WSATYPE_NOT_FOUND, "Class not found",
0, NULL, "WSATYPE_NOT_FOUND" },
/* 110 */ { WSA_E_NO_MORE, "No more services",
0, NULL, "WSA_E_NO_MORE" },
/* 111 */ { WSA_E_CANCELLED, "Service lookup cancelled",
0, NULL, "WSA_E_CANCELLED" },
/* 112 */ { WSAEREFUSED, "Database query refused",
0, NULL, "WSAEREFUSED" },
/* end */ { -1, NULL, -1, NULL, NULL }
};
/* Extended list of error structures. */
static socket_error_t socket_h_errno [] = {
/* 000 */ { 0, NULL, 0, NULL, NULL },
/* 001 */ { WSAHOST_NOT_FOUND, "Host not found",
HOST_NOT_FOUND, "HOST_NOT_FOUND", "WSAHOST_NOT_FOUND" },
/* 002 */ { WSATRY_AGAIN, "Non-authoritative host not found",
TRY_AGAIN, "TRY_AGAIN", "WSATRY_AGAIN" },
/* 003 */ { WSANO_RECOVERY, "This is a non-recoverable error",
NO_RECOVERY, "NO_RECOVERY", "WSANO_RECOVERY" },
/* 004 */ { WSANO_DATA, "Valid name, no data record of requested type",
NO_DATA, "NO_DATA", "WSANO_DATA" },
/* 005 */ { WSANO_ADDRESS, "No address, look for MX record",
NO_ADDRESS, "NO_ADDRESS", "WSANO_ADDRESS" },
/* end */ { -1, NULL, -1, NULL, NULL }
};
/* Returns the result of @code{WSAGetLastError()}. */
int
scm_i_socket_errno (void)
{
return WSAGetLastError ();
}
/* Returns a valid error message for Winsock-API error codes obtained via
@code{WSAGetLastError()} or NULL otherwise. */
char *
scm_i_socket_strerror (int error)
{
if (error >= WSABASEERR && error <= (WSABASEERR + 112))
return socket_errno[error - WSABASEERR].str;
else if (error >= (WSABASEERR + 1000) && error <= (WSABASEERR + 1005))
return socket_h_errno[error - (WSABASEERR + 1000)].str;
return NULL;
}
/* Constructs a valid filename for the given file @var{file} in the M$-Windows
directory. This is usually the default location for the network files. */
char *
scm_i_socket_filename (char *file)
{
static char dir[PATH_MAX];
int len = PATH_MAX;
len = GetWindowsDirectory (dir, len);
if (dir[len - 1] != '\\')
strcat (dir, "\\");
strcat (dir, file);
return dir;
}
/* Removes comments and white spaces at end of line and returns a pointer
to the end of the line. */
static char *
scm_i_socket_uncomment (char *line)
{
char *end;
if ((end = strchr (line, '#')) != NULL)
*end-- = '\0';
else
{
end = line + strlen (line) - 1;
while (end > line && (*end == '\r' || *end == '\n'))
*end-- = '\0';
}
while (end > line && isspace (*end))
*end-- = '\0';
return end;
}
/* The getservent() function reads the next line from the file `/etc/services'
and returns a structure servent containing the broken out fields from the
line. The `/etc/services' file is opened if necessary. */
struct servent *
getservent (void)
{
char line[MAX_NAMLEN], *end, *p;
int done = 0, i, n, a;
struct servent *e = NULL;
/* Ensure a open file. */
if (scm_i_servent.fd == NULL || feof (scm_i_servent.fd))
{
setservent (1);
if (scm_i_servent.fd == NULL)
return NULL;
}
while (!done)
{
/* Get new line. */
if (fgets (line, MAX_NAMLEN, scm_i_servent.fd) != NULL)
{
end = scm_i_socket_uncomment (line);
/* Scan the line. */
if ((i = sscanf (line, "%s %d/%s%n",
scm_i_servent.name,
&scm_i_servent.port,
scm_i_servent.proto, &n)) != 3)
continue;
/* Scan the remaining aliases. */
p = line + n;
for (a = 0; a < MAX_ALIASES && p < end && i != -1 && n > 1;
a++, p += n)
i = sscanf (p, "%s%n", scm_i_servent.alias[a], &n);
/* Prepare the return value. */
e = &scm_i_servent.ent;
e->s_name = scm_i_servent.name;
e->s_port = htons (scm_i_servent.port);
e->s_proto = scm_i_servent.proto;
e->s_aliases = scm_i_servent.aliases;
scm_i_servent.aliases[a] = NULL;
while (a--)
scm_i_servent.aliases[a] = scm_i_servent.alias[a];
done = 1;
}
else
break;
}
return done ? e : NULL;
}
/* The setservent() function opens and rewinds the `/etc/services' file.
This file can be set from outside with an environment variable specifying
the file name. */
void
setservent (int stayopen)
{
char *file = NULL;
endservent ();
if ((file = getenv (ENVIRON_ETC_SERVICES)) != NULL)
strcpy (scm_i_servent.file, file);
else if ((file = scm_i_socket_filename (FILE_ETC_SERVICES)) != NULL)
strcpy (scm_i_servent.file, file);
scm_i_servent.fd = fopen (scm_i_servent.file, "rt");
}
/* The endservent() function closes the `/etc/services' file. */
void
endservent (void)
{
if (scm_i_servent.fd != NULL)
{
fclose (scm_i_servent.fd);
scm_i_servent.fd = NULL;
}
}
/* The getprotoent() function reads the next line from the file
`/etc/protocols' and returns a structure protoent containing the broken
out fields from the line. The `/etc/protocols' file is opened if
necessary. */
struct protoent *
getprotoent (void)
{
char line[MAX_NAMLEN], *end, *p;
int done = 0, i, n, a;
struct protoent *e = NULL;
/* Ensure a open file. */
if (scm_i_protoent.fd == NULL || feof (scm_i_protoent.fd))
{
setprotoent (1);
if (scm_i_protoent.fd == NULL)
return NULL;
}
while (!done)
{
/* Get new line. */
if (fgets (line, MAX_NAMLEN, scm_i_protoent.fd) != NULL)
{
end = scm_i_socket_uncomment (line);
/* Scan the line. */
if ((i = sscanf (line, "%s %d%n",
scm_i_protoent.name,
&scm_i_protoent.proto, &n)) != 2)
continue;
/* Scan the remaining aliases. */
p = line + n;
for (a = 0; a < MAX_ALIASES && p < end && i != -1 && n > 1;
a++, p += n)
i = sscanf (p, "%s%n", scm_i_protoent.alias[a], &n);
/* Prepare the return value. */
e = &scm_i_protoent.ent;
e->p_name = scm_i_protoent.name;
e->p_proto = scm_i_protoent.proto;
e->p_aliases = scm_i_protoent.aliases;
scm_i_protoent.aliases[a] = NULL;
while (a--)
scm_i_protoent.aliases[a] = scm_i_protoent.alias[a];
done = 1;
}
else
break;
}
return done ? e : NULL;
}
/* The setprotoent() function opens and rewinds the `/etc/protocols' file.
As in setservent() the user can modify the location of the file using
an environment variable. */
void
setprotoent (int stayopen)
{
char *file = NULL;
endprotoent ();
if ((file = getenv (ENVIRON_ETC_PROTOCOLS)) != NULL)
strcpy (scm_i_protoent.file, file);
else if ((file = scm_i_socket_filename (FILE_ETC_PROTOCOLS)) != NULL)
strcpy (scm_i_protoent.file, file);
scm_i_protoent.fd = fopen (scm_i_protoent.file, "rt");
}
/* The endprotoent() function closes `/etc/protocols'. */
void
endprotoent (void)
{
if (scm_i_protoent.fd != NULL)
{
fclose (scm_i_protoent.fd);
scm_i_protoent.fd = NULL;
}
}
/* Define both the original and replacement error symbol is possible. Thus
the user is able to check symbolic errors after unsuccessful networking
function calls. */
static void
scm_socket_symbols_Win32 (socket_error_t * e)
{
while (e->error != -1)
{
if (e->error)
{
if (e->correct_str)
scm_c_define (e->correct_str, SCM_MAKINUM (e->error));
if (e->replace && e->replace_str)
scm_c_define (e->replace_str, SCM_MAKINUM (e->replace));
}
e++;
}
}
/* Initialize Winsock API under M$-Windows. */
void
scm_i_init_socket_Win32 (void)
{
scm_socket_symbols_Win32 (socket_errno);
scm_socket_symbols_Win32 (socket_h_errno);
}
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