140 lines
3.8 KiB
C
140 lines
3.8 KiB
C
/* 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[] = "$FreeBSD$";
|
||
#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;
|
||
}
|