126 lines
2.5 KiB
C++
126 lines
2.5 KiB
C++
/* pwdgrp.h
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Copyright 2001 Red Hat inc.
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Stuff common to pwd and grp handling.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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enum pwdgrp_state {
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uninitialized = 0,
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initializing,
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emulated,
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loaded
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};
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class pwdgrp_check {
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pwdgrp_state state;
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FILETIME last_modified;
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char file_w32[MAX_PATH];
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public:
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pwdgrp_check () : state (uninitialized) {}
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operator pwdgrp_state ()
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{
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if (state != uninitialized && file_w32[0] && cygheap->etc_changed ())
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{
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HANDLE h;
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WIN32_FIND_DATA data;
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if ((h = FindFirstFile (file_w32, &data)) != INVALID_HANDLE_VALUE)
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{
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if (CompareFileTime (&data.ftLastWriteTime, &last_modified) > 0)
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state = uninitialized;
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FindClose (h);
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}
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}
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return state;
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}
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void operator = (pwdgrp_state nstate)
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{
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state = nstate;
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}
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void set_last_modified (HANDLE fh, const char *name)
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{
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if (!file_w32[0])
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strcpy (file_w32, name);
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GetFileTime (fh, NULL, NULL, &last_modified);
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}
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};
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class pwdgrp_read {
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path_conv pc;
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HANDLE fh;
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char *buf;
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char *lptr, *eptr;
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public:
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pwdgrp_read ()
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: fh (INVALID_HANDLE_VALUE), buf (NULL), lptr (NULL), eptr (NULL) {}
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virtual ~pwdgrp_read ()
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{
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if (fh != INVALID_HANDLE_VALUE)
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CloseHandle (fh);
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if (buf)
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free (buf);
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}
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bool open (const char *posix_fname)
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{
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if (buf)
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free (buf);
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buf = lptr = eptr = NULL;
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pc.check (posix_fname);
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if (pc.error || !pc.exists () || !pc.isdisk () || pc.isdir ())
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return false;
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fh = CreateFile (pc, GENERIC_READ, wincap.shared (), NULL, OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL, 0);
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if (fh)
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{
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DWORD size = GetFileSize (fh, NULL), read_bytes;
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buf = (char *) malloc (size + 1);
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if (!ReadFile (fh, buf, size, &read_bytes, NULL))
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{
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if (buf)
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free (buf);
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buf = NULL;
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CloseHandle (fh);
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fh = INVALID_HANDLE_VALUE;
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return false;
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}
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buf[read_bytes] = '\0';
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return true;
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}
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return false;
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}
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char *gets ()
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{
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if (!buf)
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return NULL;
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if (!lptr)
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lptr = buf;
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else if (!eptr)
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return lptr = NULL;
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else
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lptr = eptr;
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eptr = strchr (lptr, '\n');
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if (eptr)
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*eptr++ = '\0';
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return lptr;
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}
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inline HANDLE get_fhandle () { return fh; }
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inline const char *get_fname () { return pc; }
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void close ()
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{
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if (fh != INVALID_HANDLE_VALUE)
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CloseHandle (fh);
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fh = INVALID_HANDLE_VALUE;
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}
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};
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