140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/* addstr.c
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Add a string to a list of strings.
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Copyright (C) 1992 Ian Lance Taylor
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This file is part of the Taylor UUCP uuconf library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License
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as published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This library 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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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The author of the program may be contacted at ian@airs.com or
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c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254.
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*/
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#include "uucnfi.h"
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#if USE_RCS_ID
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const char _uuconf_addstr_rcsid[] = "$Id: addstr.c,v 1.1 1993/08/04 19:33:32 jtc Exp $";
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#endif
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#include <errno.h>
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/* When setting system information, we need to be able to distinguish
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between a value that is not set and a value that has been set to
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NULL. We do this by initializing the value to point to the
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variable _uuconf_unset, and then correcting it in the function
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_uuconf_isystem_basic_default. This variable is declared in this
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file because some linkers will apparently not pull in an object
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file which merely declarates a variable. This functions happens to
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be pulled in by almost everything. */
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char *_uuconf_unset;
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/* Add a string to a list of strings. The list is maintained as an
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array of elements ending in NULL. The total number of available
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slots is always a multiple of CSLOTS, so by counting the current
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number of elements we can tell whether a new slot is needed. If
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the fcopy argument is TRUE, the new string is duplicated into
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memory. If the fcheck argument is TRUE, this does not add a string
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that is already in the list. The pblock argument may be used to do
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the allocations within a memory block. This returns a standard
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uuconf error code. */
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#define CSLOTS (8)
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int
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_uuconf_iadd_string (qglobal, zadd, fcopy, fcheck, ppzstrings, pblock)
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struct sglobal *qglobal;
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char *zadd;
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boolean fcopy;
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boolean fcheck;
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char ***ppzstrings;
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pointer pblock;
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{
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char **pz;
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size_t c;
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if (fcheck && *ppzstrings != NULL)
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{
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for (pz = *ppzstrings; *pz != NULL; pz++)
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if (strcmp (zadd, *pz) == 0)
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return UUCONF_SUCCESS;
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}
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if (fcopy)
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{
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size_t clen;
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char *znew;
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clen = strlen (zadd) + 1;
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znew = (char *) uuconf_malloc (pblock, clen);
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if (znew == NULL)
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{
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if (qglobal != NULL)
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qglobal->ierrno = errno;
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return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO;
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}
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memcpy ((pointer) znew, (pointer) zadd, clen);
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zadd = znew;
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}
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pz = *ppzstrings;
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if (pz == NULL || pz == (char **) &_uuconf_unset)
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{
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pz = (char **) uuconf_malloc (pblock, CSLOTS * sizeof (char *));
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if (pz == NULL)
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{
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if (qglobal != NULL)
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qglobal->ierrno = errno;
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return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO;
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}
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*ppzstrings = pz;
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}
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else
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{
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c = 0;
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while (*pz != NULL)
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{
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++pz;
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++c;
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}
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if ((c + 1) % CSLOTS == 0)
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{
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char **pznew;
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pznew = (char **) uuconf_malloc (pblock,
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((c + 1 + CSLOTS)
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* sizeof (char *)));
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if (pznew == NULL)
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{
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if (qglobal != NULL)
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qglobal->ierrno = errno;
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return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO;
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}
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memcpy ((pointer) pznew, (pointer) *ppzstrings,
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c * sizeof (char *));
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uuconf_free (pblock, *ppzstrings);
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*ppzstrings = pznew;
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pz = pznew + c;
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}
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}
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pz[0] = zadd;
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pz[1] = NULL;
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return UUCONF_SUCCESS;
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}
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