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@@ -0,0 +1,456 @@
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+/* agent.c - Talking to gpg-agent.
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+ Copyright (C) 2008 g10 Code GmbH
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+
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+ This file is part of Scute.
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+
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+ Scute is free software; you can redistribute it and/or modify it
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+ under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 2 of the License, or
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+ (at your option) any later version.
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+
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+ Scute is distributed in the hope that it will be useful, but
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+ WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ General Public License for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with Scute; if not, write to the Free Software Foundation,
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+ Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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+
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+ In addition, as a special exception, g10 Code GmbH gives permission
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+ to link this library: with the Mozilla Foundation's code for
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+ Mozilla (or with modified versions of it that use the same license
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+ as the "Mozilla" code), and distribute the linked executables. You
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+ must obey the GNU General Public License in all respects for all of
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+ the code used other than "Mozilla". If you modify this file, you
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+ may extend this exception to your version of the file, but you are
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+ not obligated to do so. If you do not wish to do so, delete this
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+ exception statement from your version. */
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+
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+#ifdef HAVE_CONFIG_H
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+#include <config.h>
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+#endif
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <string.h>
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+#include <assert.h>
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+#include <errno.h>
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+#include <sys/time.h>
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+#include <sys/types.h>
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+#include <signal.h>
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+#include <fcntl.h>
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+#include <stdarg.h>
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+#ifdef HAVE_W32_SYSTEM
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+#include <windows.h>
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+#include <shlobj.h>
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+#include <io.h>
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+#endif
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+
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+#include "support.h"
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+
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+#ifdef HAVE_W32_SYSTEM
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+#define GNUPG_DEFAULT_HOMEDIR "c:/gnupg"
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+#elif defined(__VMS)
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+#define GNUPG_DEFAULT_HOMEDIR "/SYS\$LOGIN/gnupg"
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+#else
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+#define GNUPG_DEFAULT_HOMEDIR "~/.gnupg"
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+#endif
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+
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+#ifdef HAVE_DOSISH_SYSTEM
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+#define DIRSEP_C '\\'
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+#define DIRSEP_S "\\"
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+#else
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+#define DIRSEP_C '/'
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+#define DIRSEP_S "/"
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+#endif
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+
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+
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+#ifdef HAVE_W32_SYSTEM
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+#define RTLD_LAZY 0
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+
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+static __inline__ void *
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+dlopen (const char * name, int flag)
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+{
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+ void * hd = LoadLibrary (name);
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+ return hd;
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+}
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+
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+static __inline__ void *
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+dlsym (void * hd, const char * sym)
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+{
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+ if (hd && sym)
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+ {
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+ void * fnc = GetProcAddress (hd, sym);
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+ if (!fnc)
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+ return NULL;
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+ return fnc;
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+ }
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+ return NULL;
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+}
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+
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+static __inline__ int
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+dlclose (void * hd)
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+{
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+ if (hd)
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+ {
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+ FreeLibrary (hd);
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+ return 0;
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+ }
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+ return -1;
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+}
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+
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+
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+/* Return a string from the W32 Registry or NULL in case of error.
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+ Caller must release the return value. A NULL for root is an alias
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+ for HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE in turn. */
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+static char *
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+read_w32_registry_string (const char *root, const char *dir, const char *name)
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+{
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+ HKEY root_key, key_handle;
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+ DWORD n1, nbytes, type;
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+ char *result = NULL;
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+
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+ if ( !root )
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+ root_key = HKEY_CURRENT_USER;
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+ else if ( !strcmp( root, "HKEY_CLASSES_ROOT" ) )
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+ root_key = HKEY_CLASSES_ROOT;
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+ else if ( !strcmp( root, "HKEY_CURRENT_USER" ) )
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+ root_key = HKEY_CURRENT_USER;
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+ else if ( !strcmp( root, "HKEY_LOCAL_MACHINE" ) )
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+ root_key = HKEY_LOCAL_MACHINE;
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+ else if ( !strcmp( root, "HKEY_USERS" ) )
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+ root_key = HKEY_USERS;
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+ else if ( !strcmp( root, "HKEY_PERFORMANCE_DATA" ) )
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+ root_key = HKEY_PERFORMANCE_DATA;
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+ else if ( !strcmp( root, "HKEY_CURRENT_CONFIG" ) )
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+ root_key = HKEY_CURRENT_CONFIG;
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+ else
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+ return NULL;
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+
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+ if ( RegOpenKeyEx ( root_key, dir, 0, KEY_READ, &key_handle ) )
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+ {
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+ if (root)
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+ return NULL; /* no need for a RegClose, so return direct */
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+ /* It seems to be common practise to fall back to HKLM. */
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+ if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, dir, 0, KEY_READ, &key_handle) )
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+ return NULL; /* still no need for a RegClose, so return direct */
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+ }
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+
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+ nbytes = 1;
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+ if ( RegQueryValueEx( key_handle, name, 0, NULL, NULL, &nbytes ) )
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+ {
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+ if (root)
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+ goto leave;
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+ /* Try to fallback to HKLM also vor a missing value. */
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+ RegCloseKey (key_handle);
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+ if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, dir, 0, KEY_READ, &key_handle) )
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+ return NULL; /* Nope. */
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+ if (RegQueryValueEx ( key_handle, name, 0, NULL, NULL, &nbytes))
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+ goto leave;
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+ }
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+ result = malloc ( (n1=nbytes+1) );
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+ if ( !result )
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+ goto leave;
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+ if ( RegQueryValueEx ( key_handle, name, 0, &type, result, &n1 ) )
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+ {
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+ free(result); result = NULL;
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+ goto leave;
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+ }
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+ result[nbytes] = 0; /* Make sure it is really a string. */
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+ if (type == REG_EXPAND_SZ && strchr (result, '%'))
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+ {
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+ char *tmp;
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+
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+ n1 += 1000;
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+ tmp = malloc (n1+1);
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+ if (!tmp)
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+ goto leave;
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+ nbytes = ExpandEnvironmentStrings (result, tmp, n1);
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+ if (nbytes && nbytes > n1)
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+ {
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+ free (tmp);
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+ n1 = nbytes;
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+ tmp = malloc (n1 + 1);
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+ if (!tmp)
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+ goto leave;
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+ nbytes = ExpandEnvironmentStrings (result, tmp, n1);
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+ if (nbytes && nbytes > n1) {
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+ free (tmp); /* Oops - truncated, better don't expand at all. */
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+ goto leave;
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+ }
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+ tmp[nbytes] = 0;
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+ free (result);
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+ result = tmp;
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+ }
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+ else if (nbytes) /* Okay, reduce the length. */
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+ {
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+ tmp[nbytes] = 0;
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+ free (result);
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+ result = malloc (strlen (tmp)+1);
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+ if (!result)
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+ result = tmp;
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+ else
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+ {
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+ strcpy (result, tmp);
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+ free (tmp);
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+ }
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+ }
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+ else /* Error - don't expand. */
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+ {
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+ free (tmp);
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+ }
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+ }
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+
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+ leave:
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+ RegCloseKey( key_handle );
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+ return result;
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+}
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+
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+
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+/* This is a helper function to load and run a Windows function from
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+ either of one DLLs. */
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+static HRESULT
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+w32_shgetfolderpath (HWND a, int b, HANDLE c, DWORD d, LPSTR e)
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+{
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+ static int initialized;
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+ static HRESULT (WINAPI * func)(HWND,int,HANDLE,DWORD,LPSTR);
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+
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+ if (!initialized)
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+ {
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+ static char *dllnames[] = { "shell32.dll", "shfolder.dll", NULL };
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+ void *handle;
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+ int i;
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+
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+ initialized = 1;
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+
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+ for (i=0, handle = NULL; !handle && dllnames[i]; i++)
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+ {
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+ handle = dlopen (dllnames[i], RTLD_LAZY);
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+ if (handle)
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+ {
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+ func = dlsym (handle, "SHGetFolderPathA");
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+ if (!func)
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+ {
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+ dlclose (handle);
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+ handle = NULL;
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+ }
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+ }
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+ }
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+ }
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+
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+ if (func)
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+ return func (a,b,c,d,e);
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+ else
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+ return -1;
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+}
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+
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+static char *
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+find_program_at_standard_place (const char *name)
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+{
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+ char path[MAX_PATH];
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+ char *result = NULL;
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+
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+ if (w32_shgetfolderpath (NULL, CSIDL_PROGRAM_FILES, NULL, 0, path) >= 0)
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+ {
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+ result = malloc (strlen (path) + 1 + strlen (name) + 1);
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+ if (result)
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+ {
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+ strcpy (stpcpy (stpcpy (result, path), "\\"), name);
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+ if (access (result, F_OK))
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+ {
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+ free (result);
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+ result = NULL;
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+ }
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+ }
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+ }
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+ return result;
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+}
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+#endif
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+
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+
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+const char *
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+get_gpgsm_path (void)
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+{
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+ static const char *pgmname;
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+
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+#ifdef HAVE_W32_SYSTEM
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+ if (!pgmname)
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+ pgmname = find_program_at_standard_place ("GNU\\GnuPG\\gpgsm.exe");
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+#endif
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+ if (!pgmname)
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+ pgmname = GPGSM_PATH;
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+ return pgmname;
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+}
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+
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+
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+const char *
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+get_gpg_agent_path (void)
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+{
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+ static const char *pgmname;
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+
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+#ifdef HAVE_W32_SYSTEM
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+ if (!pgmname)
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+ pgmname = find_program_at_standard_place ("GNU\\GnuPG\\gpg-agent.exe");
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+#endif
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+ if (!pgmname)
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+ pgmname = GPG_AGENT_PATH;
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+ return pgmname;
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+}
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+
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+
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+
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+/* Home directory. */
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+
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+#ifdef HAVE_W32_SYSTEM
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+#ifndef CSIDL_APPDATA
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+#define CSIDL_APPDATA 0x001a
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+#endif
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+#ifndef CSIDL_LOCAL_APPDATA
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+#define CSIDL_LOCAL_APPDATA 0x001c
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+#endif
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+#ifndef CSIDL_COMMON_APPDATA
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+#define CSIDL_COMMON_APPDATA 0x0023
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+#endif
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+#ifndef CSIDL_FLAG_CREATE
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+#define CSIDL_FLAG_CREATE 0x8000
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+#endif
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+#endif /*HAVE_W32_SYSTEM*/
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+
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+/* Get the standard home directory. In general this function should
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+ not be used as it does not consider a registry value (under W32) or
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+ the GNUPGHOME environment variable. It is better to use
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+ default_homedir(). */
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+const char *
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+standard_homedir (void)
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+{
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+#ifdef HAVE_W32_SYSTEM
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+ static const char *dir;
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+
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+ if (!dir)
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+ {
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+ char path[MAX_PATH];
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+
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|
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+ /* It might be better to use LOCAL_APPDATA because this is
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+ defined as "non roaming" and thus more likely to be kept
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+ locally. For private keys this is desired. However, given
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+ that many users copy private keys anyway forth and back,
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+ using a system roaming services might be better than to let
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+ them do it manually. A security conscious user will anyway
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+ use the registry entry to have better control. */
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+ if (w32_shgetfolderpath (NULL, CSIDL_APPDATA|CSIDL_FLAG_CREATE,
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+ NULL, 0, path) >= 0)
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+ {
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+ char *tmp = malloc (strlen (path) + 6 +1);
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+ if (tmp)
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+ {
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+ strcpy (stpcpy (tmp, path), "\\gnupg");
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+ dir = tmp;
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+
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+ /* Try to create the directory if it does not yet exists. */
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+ if (access (dir, F_OK))
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+ CreateDirectory (dir, NULL);
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+ }
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+ }
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+
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+ if (!dir)
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+ dir = GNUPG_DEFAULT_HOMEDIR;
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+ }
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+ return dir;
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+#else/*!HAVE_W32_SYSTEM*/
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+ return GNUPG_DEFAULT_HOMEDIR;
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+#endif /*!HAVE_W32_SYSTEM*/
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+}
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+
|
|
|
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+/* Set up the default home directory. The usual --homedir option
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+ should be parsed later. */
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|
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+const char *
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|
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+default_homedir (void)
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|
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+{
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|
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+ const char *dir;
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+
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+ dir = getenv ("GNUPGHOME");
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|
|
+#ifdef HAVE_W32_SYSTEM
|
|
|
|
+ if (!dir || !*dir)
|
|
|
|
+ {
|
|
|
|
+ static const char *saved_dir;
|
|
|
|
+
|
|
|
|
+ if (!saved_dir)
|
|
|
|
+ {
|
|
|
|
+ if (!dir || !*dir)
|
|
|
|
+ {
|
|
|
|
+ char *tmp;
|
|
|
|
+
|
|
|
|
+ tmp = read_w32_registry_string (NULL, "Software\\GNU\\GnuPG",
|
|
|
|
+ "HomeDir");
|
|
|
|
+ if (tmp && *tmp)
|
|
|
|
+ {
|
|
|
|
+ free (tmp);
|
|
|
|
+ tmp = NULL;
|
|
|
|
+ }
|
|
|
|
+ if (tmp)
|
|
|
|
+ saved_dir = tmp;
|
|
|
|
+ }
|
|
|
|
+
|
|
|
|
+ if (!saved_dir)
|
|
|
|
+ saved_dir = standard_homedir ();
|
|
|
|
+ }
|
|
|
|
+ dir = saved_dir;
|
|
|
|
+ }
|
|
|
|
+#endif /*HAVE_W32_SYSTEM*/
|
|
|
|
+ if (!dir || !*dir)
|
|
|
|
+ dir = GNUPG_DEFAULT_HOMEDIR;
|
|
|
|
+
|
|
|
|
+ return dir;
|
|
|
|
+}
|
|
|
|
+
|
|
|
|
+
|
|
|
|
+/* Construct a filename from the NULL terminated list of parts. Tilde
|
|
|
|
+ expansion is done here. */
|
|
|
|
+char *
|
|
|
|
+make_filename (const char *first_part, ...)
|
|
|
|
+{
|
|
|
|
+ va_list arg_ptr;
|
|
|
|
+ size_t n;
|
|
|
|
+ const char *s;
|
|
|
|
+ char *name;
|
|
|
|
+ char *home;
|
|
|
|
+ char *p;
|
|
|
|
+
|
|
|
|
+ va_start (arg_ptr, first_part);
|
|
|
|
+ n = strlen (first_part) + 1;
|
|
|
|
+ while ((s = va_arg (arg_ptr, const char *)))
|
|
|
|
+ n += strlen (s) + 1;
|
|
|
|
+ va_end (arg_ptr);
|
|
|
|
+
|
|
|
|
+ home = NULL;
|
|
|
|
+ if (*first_part == '~' && first_part[1] == '/'
|
|
|
|
+ && (home = getenv("HOME")) && *home)
|
|
|
|
+ n += strlen (home);
|
|
|
|
+
|
|
|
|
+ name = malloc (n);
|
|
|
|
+ if (! name)
|
|
|
|
+ return NULL;
|
|
|
|
+ p = (home
|
|
|
|
+ ? stpcpy (stpcpy (name,home), first_part + 1)
|
|
|
|
+ : stpcpy (name, first_part));
|
|
|
|
+
|
|
|
|
+ va_start (arg_ptr, first_part);
|
|
|
|
+ while ((s = va_arg(arg_ptr, const char *)))
|
|
|
|
+ p = stpcpy (stpcpy (p,"/"), s);
|
|
|
|
+ va_end (arg_ptr);
|
|
|
|
+
|
|
|
|
+#ifdef HAVE_W32_SYSTEM
|
|
|
|
+ /* We better avoid mixing slashes and backslashes and prefer
|
|
|
|
+ backslashes. There is usual no problem with mixing them, however
|
|
|
|
+ a very few W32 API calls can't grok plain slashes. Printing
|
|
|
|
+ filenames with mixed slashes also looks a bit strange. */
|
|
|
|
+ if (strchr (name, '\\'))
|
|
|
|
+ {
|
|
|
|
+ for (p = name; *p; p++)
|
|
|
|
+ if (*p == '/')
|
|
|
|
+ *p = '\\';
|
|
|
|
+ }
|
|
|
|
+#endif
|
|
|
|
+
|
|
|
|
+ return name;
|
|
|
|
+}
|