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Annotation of coherent/g/usr/lib/uucp/tay104/uuconf/addstr.c, revision 1.1.1.1

1.1       root        1: /* addstr.c
                      2:    Add a string to a list of strings.
                      3: 
                      4:    Copyright (C) 1992 Ian Lance Taylor
                      5: 
                      6:    This file is part of the Taylor UUCP uuconf library.
                      7: 
                      8:    This library is free software; you can redistribute it and/or
                      9:    modify it under the terms of the GNU Library General Public License
                     10:    as published by the Free Software Foundation; either version 2 of
                     11:    the License, or (at your option) any later version.
                     12: 
                     13:    This library is distributed in the hope that it will be useful, but
                     14:    WITHOUT ANY WARRANTY; without even the implied warranty of
                     15:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
                     16:    Library General Public License for more details.
                     17: 
                     18:    You should have received a copy of the GNU Library General Public
                     19:    License along with this library; if not, write to the Free Software
                     20:    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
                     21: 
                     22:    The author of the program may be contacted at [email protected] or
                     23:    c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254.
                     24:    */
                     25: 
                     26: #include "uucnfi.h"
                     27: 
                     28: #if USE_RCS_ID
                     29: const char _uuconf_addstr_rcsid[] = "$Id: addstr.c,v 1.1 93/07/30 08:06:59 bin Exp Locker: bin $";
                     30: #endif
                     31: 
                     32: #include <errno.h>
                     33: 
                     34: /* When setting system information, we need to be able to distinguish
                     35:    between a value that is not set and a value that has been set to
                     36:    NULL.  We do this by initializing the value to point to the
                     37:    variable _uuconf_unset, and then correcting it in the function
                     38:    _uuconf_isystem_basic_default.  This variable is declared in this
                     39:    file because some linkers will apparently not pull in an object
                     40:    file which merely declarates a variable.  This functions happens to
                     41:    be pulled in by almost everything.  */
                     42: 
                     43: char *_uuconf_unset;
                     44: 
                     45: /* Add a string to a list of strings.  The list is maintained as an
                     46:    array of elements ending in NULL.  The total number of available
                     47:    slots is always a multiple of CSLOTS, so by counting the current
                     48:    number of elements we can tell whether a new slot is needed.  If
                     49:    the fcopy argument is TRUE, the new string is duplicated into
                     50:    memory.  If the fcheck argument is TRUE, this does not add a string
                     51:    that is already in the list.  The pblock argument may be used to do
                     52:    the allocations within a memory block.  This returns a standard
                     53:    uuconf error code.  */
                     54: 
                     55: #define CSLOTS (8)
                     56: 
                     57: int
                     58: _uuconf_iadd_string (qglobal, zadd, fcopy, fcheck, ppzstrings, pblock)
                     59:      struct sglobal *qglobal;
                     60:      char *zadd;
                     61:      boolean fcopy;
                     62:      boolean fcheck;
                     63:      char ***ppzstrings;
                     64:      pointer pblock;
                     65: {
                     66:   char **pz;
                     67:   size_t c;
                     68: 
                     69:   if (fcheck && *ppzstrings != NULL)
                     70:     {
                     71:       for (pz = *ppzstrings; *pz != NULL; pz++)
                     72:        if (strcmp (zadd, *pz) == 0)
                     73:          return UUCONF_SUCCESS;
                     74:     }
                     75: 
                     76:   if (fcopy)
                     77:     {
                     78:       size_t clen;
                     79:       char *znew;
                     80: 
                     81:       clen = strlen (zadd) + 1;
                     82:       znew = (char *) uuconf_malloc (pblock, clen);
                     83:       if (znew == NULL)
                     84:        {
                     85:          if (qglobal != NULL)
                     86:            qglobal->ierrno = errno;
                     87:          return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO;
                     88:        }
                     89:       memcpy ((pointer) znew, (pointer) zadd, clen);
                     90:       zadd = znew;
                     91:     }
                     92: 
                     93:   pz = *ppzstrings;
                     94:   if (pz == NULL || pz == (char **) &_uuconf_unset)
                     95:     {
                     96:       pz = (char **) uuconf_malloc (pblock, CSLOTS * sizeof (char *));
                     97:       if (pz == NULL)
                     98:        {
                     99:          if (qglobal != NULL)
                    100:            qglobal->ierrno = errno;
                    101:          return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO;
                    102:        }
                    103:       *ppzstrings = pz;
                    104:     }
                    105:   else
                    106:     {
                    107:       c = 0;
                    108:       while (*pz != NULL)
                    109:        {
                    110:          ++pz;
                    111:          ++c;
                    112:        }
                    113: 
                    114:       if ((c + 1) % CSLOTS == 0)
                    115:        {
                    116:          char **pznew;
                    117: 
                    118:          pznew = (char **) uuconf_malloc (pblock,
                    119:                                           ((c + 1 + CSLOTS)
                    120:                                            * sizeof (char *)));
                    121:          if (pznew == NULL)
                    122:            {
                    123:              if (qglobal != NULL)
                    124:                qglobal->ierrno = errno;
                    125:              return UUCONF_MALLOC_FAILED | UUCONF_ERROR_ERRNO;
                    126:            }
                    127:          memcpy ((pointer) pznew, (pointer) *ppzstrings,
                    128:                  c * sizeof (char *));
                    129:          uuconf_free (pblock, *ppzstrings);
                    130:          *ppzstrings = pznew;
                    131:          pz = pznew + c;
                    132:        }
                    133:     }
                    134: 
                    135:   pz[0] = zadd;
                    136:   pz[1] = NULL;
                    137: 
                    138:   return UUCONF_SUCCESS;
                    139: }

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