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/* pwdgrp.h
Copyright 2001 Red Hat inc.
Stuff common to pwd and grp handling.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
/* These functions are needed to allow searching and walking through
the passwd and group lists */
extern struct passwd *internal_getpwsid (cygsid &);
extern struct passwd *internal_getpwnam (const char *, BOOL = FALSE);
extern struct passwd *internal_getpwuid (__uid32_t, BOOL = FALSE);
extern struct __group32 *internal_getgrsid (cygsid &);
extern struct __group32 *internal_getgrgid (__gid32_t gid, BOOL = FALSE);
extern struct __group32 *internal_getgrnam (const char *, BOOL = FALSE);
extern struct __group32 *internal_getgrent (int);
int internal_getgroups (int, __gid32_t *, cygsid * = NULL);
enum pwdgrp_state {
uninitialized = 0,
initializing,
loaded
};
#define MAX_ETC_FILES 2
class etc
{
static int curr_ix;
static bool sawchange[MAX_ETC_FILES];
static const char *fn[MAX_ETC_FILES];
static FILETIME last_modified[MAX_ETC_FILES];
static bool dir_changed (int);
static int init (int, const char *);
static bool file_changed (int);
static void set_last_modified (int, FILETIME&);
friend class pwdgrp;
};
class pwdgrp
{
pwdgrp_state state;
int pwd_ix;
path_conv pc;
char *buf;
char *lptr, *eptr;
char *gets ()
{
if (!buf)
lptr = NULL;
else if (!eptr)
lptr = NULL;
else
{
lptr = eptr;
eptr = strchr (lptr, '\n');
if (eptr)
{
if (eptr > lptr && *(eptr - 1) == '\r')
*(eptr - 1) = 0;
*eptr++ = '\0';
}
}
return lptr;
}
public:
pwdgrp () : state (uninitialized) {}
BOOL isinitializing ()
{
if (state <= initializing)
state = initializing;
else if (etc::file_changed (pwd_ix - 1))
state = initializing;
return state == initializing;
}
void operator = (pwdgrp_state nstate) { state = nstate; }
BOOL isuninitialized () const { return state == uninitialized; }
bool load (const char *posix_fname, void (* add_line) (char *))
{
if (buf)
free (buf);
buf = lptr = eptr = NULL;
pc.check (posix_fname);
pwd_ix = etc::init (pwd_ix - 1, pc) + 1;
paranoid_printf ("%s", posix_fname);
bool res;
if (pc.error || !pc.exists () || !pc.isdisk () || pc.isdir ())
res = false;
else
{
HANDLE fh = CreateFile (pc, GENERIC_READ, wincap.shared (), NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
if (fh == INVALID_HANDLE_VALUE)
res = false;
else
{
DWORD size = GetFileSize (fh, NULL), read_bytes;
buf = (char *) malloc (size + 1);
if (!ReadFile (fh, buf, size, &read_bytes, NULL))
{
if (buf)
free (buf);
buf = NULL;
fh = NULL;
return false;
}
buf[read_bytes] = '\0';
eptr = buf;
CloseHandle (fh);
FILETIME ft;
if (GetFileTime (fh, NULL, NULL, &ft))
etc::set_last_modified (pwd_ix - 1, ft);
char *line;
while ((line = gets()) != NULL)
add_line (line);
res = true;
}
}
state = loaded;
return res;
}
};
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