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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. */
enum pwdgrp_state {
uninitialized = 0,
initializing,
emulated,
loaded
};
class pwdgrp_check {
pwdgrp_state state;
FILETIME last_modified;
char file_w32[MAX_PATH];
public:
pwdgrp_check () : state (uninitialized) {}
operator pwdgrp_state ()
{
if (state != uninitialized && file_w32[0] && cygheap->etc_changed ())
{
HANDLE h;
WIN32_FIND_DATA data;
if ((h = FindFirstFile (file_w32, &data)) != INVALID_HANDLE_VALUE)
{
if (CompareFileTime (&data.ftLastWriteTime, &last_modified) > 0)
state = uninitialized;
FindClose (h);
}
}
return state;
}
void operator = (pwdgrp_state nstate)
{
state = nstate;
}
void set_last_modified (HANDLE fh, const char *name)
{
if (!file_w32[0])
strcpy (file_w32, name);
GetFileTime (fh, NULL, NULL, &last_modified);
}
};
class pwdgrp_read {
path_conv pc;
HANDLE fh;
char *buf;
char *lptr, *eptr;
public:
bool open (const char *posix_fname)
{
if (buf)
free (buf);
buf = lptr = eptr = NULL;
pc.check (posix_fname);
if (pc.error || !pc.exists () || !pc.isdisk () || pc.isdir ())
return false;
fh = CreateFile (pc, GENERIC_READ, wincap.shared (), NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, 0);
if (fh != INVALID_HANDLE_VALUE)
{
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;
CloseHandle (fh);
fh = NULL;
return false;
}
buf[read_bytes] = '\0';
return true;
}
return false;
}
char *gets ()
{
if (!buf)
return NULL;
if (!lptr)
lptr = buf;
else if (!eptr)
return lptr = NULL;
else
lptr = eptr;
eptr = strchr (lptr, '\n');
if (eptr)
*eptr++ = '\0';
return lptr;
}
inline HANDLE get_fhandle () { return fh; }
inline const char *get_fname () { return pc; }
void close ()
{
if (fh)
CloseHandle (fh);
fh = NULL;
}
};
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