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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: addstr.c,v 1.7 1995/06/21 19:21:26 ian Rel $";
- #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;
- }
-