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/*
* make_env.c
*
* $Id$
*
* Add a variable to the environment
*
* This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
* project.
*
* Copyright (C) 1998-2012 OpenLink Software
*
* This project 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; only version 2 of the License, dated June 1991.
*
* 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 program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*
*/
#include "libutil.h"
#if defined (HAVE_SETENV)
int
make_env (const char *id, const char *value)
{
return setenv (id, value, 1);
}
#elif !defined (VMS)
#ifdef WIN32
_CRTIMP extern char **environ;
#elif !defined (__WATCOMC__)
extern char **environ;
#endif
static int localEnv = 0;
int
make_env (const char *id, const char *value)
{
char newBuf[1024];
char **newEnviron;
u_int numEntries;
size_t size;
char **ep;
char *p;
/*
* Make sure we have a local copy of the environment
* in case we want to free something in the old environment
* which is not safe on all operating systems
*/
if (!localEnv)
{
numEntries = 0;
for (ep = environ; ep && *ep != NULL; ++ep, numEntries++)
;
newEnviron = (char **) calloc (numEntries + 1, sizeof (char *));
if (newEnviron == NULL)
return -1;
numEntries = 0;
for (ep = environ; ep && *ep != NULL; ++ep, numEntries++)
if ((newEnviron[numEntries] = strdup (environ[numEntries])) == NULL)
return -1;
environ = newEnviron;
localEnv = 1;
}
/*
* Search for identifier in the environment
*/
size = strlen (id);
numEntries = 0;
for (ep = environ; ep && *ep != NULL; ++ep, numEntries++)
{
#if defined(WIN32)
if (!strnicmp (*ep, id, size)
#else
if (!strncmp (*ep, id, size)
#endif
&& (*ep)[size] == '=')
{
break;
}
}
/*
* Remove the variable from the environment if
* value unspecified
*/
if (value == NULL || value[0] == '\0')
{
if (ep && *ep)
{
free (*ep);
for ( ; ep[1]; ep++)
ep[0] = ep[1];
*ep = NULL;
}
return 0;
}
/*
* Construct a new environment variable
*/
p = stpcpy (newBuf, id);
*p++ = '=';
strncpy (p, value, sizeof (newBuf) - size - 1);
if (ep == NULL || *ep == NULL)
{
newEnviron = (char **) calloc (numEntries + 2, sizeof (char *));
if (newEnviron == NULL)
return -1;
memcpy (newEnviron, environ, numEntries * sizeof (char *));
ep = &newEnviron[numEntries];
free (environ);
environ = newEnviron;
}
else
free (*ep);
return ((*ep = strdup (newBuf)) == NULL) ? -1 : 0;
}
#else /* VMS version */
#include descrip
#include lnmdef
#include <vms/syscalls.h>
/*
* make_env, VMS version: use logical names in LNM$PROCESS
*
* A small piece of intelligence: if the logical name ends in
* '.]', it is created with the attribute LNM$M_CONCEALED.
*/
int
make_env (const char *id, const char *value)
{
item_list_3_type crlnm_items[3];
$DESCRIPTOR (tabnam, "LNM$PROCESS_TABLE");
struct dsc$descriptor lognam;
unsigned status;
unsigned long attributes = LNM$M_CONCEALED;
int i = 0, len;
len = strlen (value);
if (len > 2)
{
if (value[len - 2] == '.' && value[len - 1] == ']')
{
log (L_DEBUG, "Creating logical \"%s\" with concealed attributes", id);
ITM3ALL (crlnm_items[i], sizeof (attributes), LNM$_ATTRIBUTES,
&attributes, 0);
i++;
}
}
ITM3ALL (crlnm_items[i], len, LNM$_STRING, value, 0); i++;
ITM3ALL (crlnm_items[i], 0, 0, 0, 0);
SET_DSC (lognam, id);
log (L_DEBUG, "Setting logical \"%s\" to \"%s\"", id, value ? value : NULL);
status = sys$crelnm (0, &tabnam, &lognam, 0, crlnm_items);
if (!VMSOK (status))
{
log (L_WARNING, "Could not create logical name \"%s\"", id);
log (L_WARNING, "VMS error = %d", status);
return -1;
}
return 0;
}
#endif /* VMS version */
#ifdef TEST
void
listenv (void)
{
char **ep;
printf ("Environment:\n");
for (ep = environ; ep && *ep; ep++)
printf ("%u: [%s]\n", (u_int)(ep - environ) + 1, *ep);
}
int
main (int argc, char **argv)
{
listenv ();
for (--argc, ++argv; argc >= 2; argc -= 2, argv += 2)
{
if (make_env (argv[0], argv[1]))
puts ("** make_env failed **");
listenv ();
}
return 0;
}
#endif
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