dist/ntp/sntp/libopts/stack.c

   1 /*      $NetBSD$        */
   2
   3
   4 /*
   5  *  stack.c
   6  *  Id: stack.c,v 4.13 2007/02/04 17:44:12 bkorb Exp
   7  *  Time-stamp:      "2007-01-13 10:43:21 bkorb"
   8  *
   9  *  This is a special option processing routine that will save the
  10  *  argument to an option in a FIFO queue.
  11  */
  12
  13 /*
  14  *  Automated Options copyright 1992-2007 Bruce Korb
  15  *
  16  *  Automated Options is free software.
  17  *  You may redistribute it and/or modify it under the terms of the
  18  *  GNU General Public License, as published by the Free Software
  19  *  Foundation; either version 2, or (at your option) any later version.
  20  *
  21  *  Automated Options is distributed in the hope that it will be useful,
  22  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  *  GNU General Public License for more details.
  25  *
  26  *  You should have received a copy of the GNU General Public License
  27  *  along with Automated Options.  See the file "COPYING".  If not,
  28  *  write to:  The Free Software Foundation, Inc.,
  29  *             51 Franklin Street, Fifth Floor,
  30  *             Boston, MA  02110-1301, USA.
  31  *
  32  * As a special exception, Bruce Korb gives permission for additional
  33  * uses of the text contained in his release of AutoOpts.
  34  *
  35  * The exception is that, if you link the AutoOpts library with other
  36  * files to produce an executable, this does not by itself cause the
  37  * resulting executable to be covered by the GNU General Public License.
  38  * Your use of that executable is in no way restricted on account of
  39  * linking the AutoOpts library code into it.
  40  *
  41  * This exception does not however invalidate any other reasons why
  42  * the executable file might be covered by the GNU General Public License.
  43  *
  44  * This exception applies only to the code released by Bruce Korb under
  45  * the name AutoOpts.  If you copy code from other sources under the
  46  * General Public License into a copy of AutoOpts, as the General Public
  47  * License permits, the exception does not apply to the code that you add
  48  * in this way.  To avoid misleading anyone as to the status of such
  49  * modified files, you must delete this exception notice from them.
  50  *
  51  * If you write modifications of your own for AutoOpts, it is your choice
  52  * whether to permit this exception to apply to your modifications.
  53  * If you do not wish that, delete this exception notice.
  54  */
  55
  56 #ifdef WITH_LIBREGEX
  57 #  include REGEX_HEADER
  58 #endif
  59
  60 /*=export_func  optionUnstackArg
  61  * private:
  62  *
  63  * what:  Remove option args from a stack
  64  * arg:   + tOptions* + pOpts    + program options descriptor +
  65  * arg:   + tOptDesc* + pOptDesc + the descriptor for this arg +
  66  *
  67  * doc:
  68  *  Invoked for options that are equivalenced to stacked options.
  69 =*/
  70 void
  71 optionUnstackArg(
  72     tOptions*  pOpts,
  73     tOptDesc*  pOptDesc )
  74 {
  75     int       res;
  76
  77     tArgList* pAL = (tArgList*)pOptDesc->optCookie;
  78     /*
  79      *  IF we don't have any stacked options,
  80      *  THEN indicate that we don't have any of these options
  81      */
  82     if (pAL == NULL) {
  83         pOptDesc->fOptState &= OPTST_PERSISTENT_MASK;
  84         if ( (pOptDesc->fOptState & OPTST_INITENABLED) == 0)
  85             pOptDesc->fOptState |= OPTST_DISABLED;
  86         return;
  87     }
  88
  89 #ifdef WITH_LIBREGEX
  90     {
  91         regex_t   re;
  92         int       i, ct, dIdx;
  93
  94         if (regcomp( &re, pOptDesc->optArg.argString, REG_NOSUB ) != 0)
  95             return;
  96
  97         /*
  98          *  search the list for the entry(s) to remove.  Entries that
  99          *  are removed are *not* copied into the result.  The source
 100          *  index is incremented every time.  The destination only when
 101          *  we are keeping a define.
 102          */
 103         for (i = 0, dIdx = 0, ct = pAL->useCt; --ct >= 0; i++) {
 104             tCC*      pzSrc = pAL->apzArgs[ i ];
 105             char*     pzEq  = strchr( pzSrc, '=' );
 106
 107             if (pzEq != NULL)
 108                 *pzEq = NUL;
 109
 110             res = regexec( &re, pzSrc, (size_t)0, NULL, 0 );
 111             switch (res) {
 112             case 0:
 113                 /*
 114                  *  Remove this entry by reducing the in-use count
 115                  *  and *not* putting the string pointer back into
 116                  *  the list.
 117                  */
 118                 AGFREE(pzSrc);
 119                 pAL->useCt--;
 120                 break;
 121
 122             default:
 123             case REG_NOMATCH:
 124                 if (pzEq != NULL)
 125                     *pzEq = '=';
 126
 127                 /*
 128                  *  IF we have dropped an entry
 129                  *  THEN we have to move the current one.
 130                  */
 131                 if (dIdx != i)
 132                     pAL->apzArgs[ dIdx ] = pzSrc;
 133                 dIdx++;
 134             }
 135         }
 136
 137         regfree( &re );
 138     }
 139 #else  /* not WITH_LIBREGEX */
 140     {
 141         int i, ct, dIdx;
 142
 143         /*
 144          *  search the list for the entry(s) to remove.  Entries that
 145          *  are removed are *not* copied into the result.  The source
 146          *  index is incremented every time.  The destination only when
 147          *  we are keeping a define.
 148          */
 149         for (i = 0, dIdx = 0, ct = pAL->useCt; --ct >= 0; i++) {
 150             tCC*      pzSrc = pAL->apzArgs[ i ];
 151             char*     pzEq  = strchr( pzSrc, '=' );
 152
 153             if (pzEq != NULL)
 154                 *pzEq = NUL;
 155
 156             if (strcmp( pzSrc, pOptDesc->optArg.argString ) == 0) {
 157                 /*
 158                  *  Remove this entry by reducing the in-use count
 159                  *  and *not* putting the string pointer back into
 160                  *  the list.
 161                  */
 162                 AGFREE(pzSrc);
 163                 pAL->useCt--;
 164             } else {
 165                 if (pzEq != NULL)
 166                     *pzEq = '=';
 167
 168                 /*
 169                  *  IF we have dropped an entry
 170                  *  THEN we have to move the current one.
 171                  */
 172                 if (dIdx != i)
 173                     pAL->apzArgs[ dIdx ] = pzSrc;
 174                 dIdx++;
 175             }
 176         }
 177     }
 178 #endif /* WITH_LIBREGEX */
 179     /*
 180      *  IF we have unstacked everything,
 181      *  THEN indicate that we don't have any of these options
 182      */
 183     if (pAL->useCt == 0) {
 184         pOptDesc->fOptState &= OPTST_PERSISTENT_MASK;
 185         if ( (pOptDesc->fOptState & OPTST_INITENABLED) == 0)
 186             pOptDesc->fOptState |= OPTST_DISABLED;
 187         AGFREE( (void*)pAL );
 188         pOptDesc->optCookie = NULL;
 189     }
 190 }
 191
 192
 193 /*
 194  *  Put an entry into an argument list.  The first argument points to
 195  *  a pointer to the argument list structure.  It gets passed around
 196  *  as an opaque address.
 197  */
 198 LOCAL void
 199 addArgListEntry( void** ppAL, void* entry )
 200 {
 201     tArgList* pAL = *(void**)ppAL;
 202
 203     /*
 204      *  IF we have never allocated one of these,
 205      *  THEN allocate one now
 206      */
 207     if (pAL == NULL) {
 208         pAL = (tArgList*)AGALOC( sizeof( *pAL ), "new option arg stack" );
 209         if (pAL == NULL)
 210             return;
 211         pAL->useCt   = 0;
 212         pAL->allocCt = MIN_ARG_ALLOC_CT;
 213         *ppAL = (void*)pAL;
 214     }
 215
 216     /*
 217      *  ELSE if we are out of room
 218      *  THEN make it bigger
 219      */
 220     else if (pAL->useCt >= pAL->allocCt) {
 221         size_t sz = sizeof( *pAL );
 222         pAL->allocCt += INCR_ARG_ALLOC_CT;
 223
 224         /*
 225          *  The base structure contains space for MIN_ARG_ALLOC_CT
 226          *  pointers.  We subtract it off to find our augment size.
 227          */
 228         sz += sizeof(char*) * (pAL->allocCt - MIN_ARG_ALLOC_CT);
 229         pAL = (tArgList*)AGREALOC( (void*)pAL, sz, "expanded opt arg stack" );
 230         if (pAL == NULL)
 231             return;
 232         *ppAL = (void*)pAL;
 233     }
 234
 235     /*
 236      *  Insert the new argument into the list
 237      */
 238     pAL->apzArgs[ (pAL->useCt)++ ] = entry;
 239 }
 240
 241
 242 /*=export_func  optionStackArg
 243  * private:
 244  *
 245  * what:  put option args on a stack
 246  * arg:   + tOptions* + pOpts    + program options descriptor +
 247  * arg:   + tOptDesc* + pOptDesc + the descriptor for this arg +
 248  *
 249  * doc:
 250  *  Keep an entry-ordered list of option arguments.
 251 =*/
 252 void
 253 optionStackArg(
 254     tOptions*  pOpts,
 255     tOptDesc*  pOD )
 256 {
 257     char * pz;
 258
 259     if (pOD->optArg.argString == NULL)
 260         return;
 261
 262     AGDUPSTR(pz, pOD->optArg.argString, "stack arg");
 263     addArgListEntry( &(pOD->optCookie), (void*)pz );
 264 }
 265 /*
 266  * Local Variables:
 267  * mode: C
 268  * c-file-style: "stroustrup"
 269  * indent-tabs-mode: nil
 270  * End:
 271  * end of autoopts/stack.c */