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/* addstr.c
Add a string to a list of strings.
Copyright (C) 1992 Ian Lance Taylor
This file is part of the Taylor UUCP uuconf library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License
as published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
The author of the program may be contacted at ian@airs.com or
c/o Cygnus Support, 48 Grove Street, Somerville, MA 02144.
*/
#include "uucnfi.h"
#if USE_RCS_ID
const char _uuconf_addstr_rcsid[] = "$Id$";
#endif
#include <errno.h>
/* When setting system information, we need to be able to distinguish
between a value that is not set and a value that has been set to
NULL. We do this by initializing the value to point to the
variable _uuconf_unset, and then correcting it in the function
_uuconf_isystem_basic_default. This variable is declared in this
file because some linkers will apparently not pull in an object
file which merely declarates a variable. This functions happens to
be pulled in by almost everything. */
char *_uuconf_unset;
/* Add a string to a list of strings. The list is maintained as an
array of elements ending in NULL. The total number of available
slots is always a multiple of CSLOTS, so by counting the current
number of elements we can tell whether a new slot is needed. If
the fcopy argument is TRUE, the new string is duplicated into
memory. If the fcheck argument is TRUE, this does not add a string
that is already in the list. The pblock argument may be used to do
the allocations within a memory block. This returns a standard
uuconf error code. */
#define CSLOTS (8)
int
_uuconf_iadd_string (qglobal, zadd, fcopy, fcheck, ppzstrings, pblock)
struct sglobal *qglobal;
char *zadd;
boolean fcopy;
boolean fcheck;
char ***ppzstrings;
pointer pblock;
{
char **pz;
size_t c;
if (fcheck && *ppzstrings != NULL)
{
for (pz = *ppzstrings; *pz != NULL; pz++)
if (strcmp (zadd, *pz) == 0)
return UUCONF_SUCCESS;
}
if (fcopy)
{
size_t clen;
char *znew;
clen = strlen (zadd) + 1;
znew = (char *) uuconf_malloc (pblock, clen);
if (znew == NULL)
{
if (qglobal != NULL)
qglobal->ierrno = errno;
return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO;
}
memcpy ((pointer) znew, (pointer) zadd, clen);
zadd = znew;
}
pz = *ppzstrings;
if (pz == NULL || pz == (char **) &_uuconf_unset)
{
pz = (char **) uuconf_malloc (pblock, CSLOTS * sizeof (char *));
if (pz == NULL)
{
if (qglobal != NULL)
qglobal->ierrno = errno;
return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO;
}
*ppzstrings = pz;
}
else
{
c = 0;
while (*pz != NULL)
{
++pz;
++c;
}
if ((c + 1) % CSLOTS == 0)
{
char **pznew;
pznew = (char **) uuconf_malloc (pblock,
((c + 1 + CSLOTS)
* sizeof (char *)));
if (pznew == NULL)
{
if (qglobal != NULL)
qglobal->ierrno = errno;
return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO;
}
memcpy ((pointer) pznew, (pointer) *ppzstrings,
c * sizeof (char *));
uuconf_free (pblock, *ppzstrings);
*ppzstrings = pznew;
pz = pznew + c;
}
}
pz[0] = zadd;
pz[1] = NULL;
return UUCONF_SUCCESS;
}
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