dist/ntp/sntp/libopts/environment.c

   1 /*      $NetBSD$        */
   2
   3
   4 /*
   5  *  Id: environment.c,v 4.13 2007/04/15 19:01:18 bkorb Exp
   6  * Time-stamp:      "2007-04-15 11:50:35 bkorb"
   7  *
   8  *  This file contains all of the routines that must be linked into
   9  *  an executable to use the generated option processing.  The optional
  10  *  routines are in separately compiled modules so that they will not
  11  *  necessarily be linked in.
  12  */
  13
  14 /*
  15  *  Automated Options copyright 1992-2007 Bruce Korb
  16  *
  17  *  Automated Options is free software.
  18  *  You may redistribute it and/or modify it under the terms of the
  19  *  GNU General Public License, as published by the Free Software
  20  *  Foundation; either version 2, or (at your option) any later version.
  21  *
  22  *  Automated Options is distributed in the hope that it will be useful,
  23  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *  GNU General Public License for more details.
  26  *
  27  *  You should have received a copy of the GNU General Public License
  28  *  along with Automated Options.  See the file "COPYING".  If not,
  29  *  write to:  The Free Software Foundation, Inc.,
  30  *             51 Franklin Street, Fifth Floor,
  31  *             Boston, MA  02110-1301, USA.
  32  *
  33  * As a special exception, Bruce Korb gives permission for additional
  34  * uses of the text contained in his release of AutoOpts.
  35  *
  36  * The exception is that, if you link the AutoOpts library with other
  37  * files to produce an executable, this does not by itself cause the
  38  * resulting executable to be covered by the GNU General Public License.
  39  * Your use of that executable is in no way restricted on account of
  40  * linking the AutoOpts library code into it.
  41  *
  42  * This exception does not however invalidate any other reasons why
  43  * the executable file might be covered by the GNU General Public License.
  44  *
  45  * This exception applies only to the code released by Bruce Korb under
  46  * the name AutoOpts.  If you copy code from other sources under the
  47  * General Public License into a copy of AutoOpts, as the General Public
  48  * License permits, the exception does not apply to the code that you add
  49  * in this way.  To avoid misleading anyone as to the status of such
  50  * modified files, you must delete this exception notice from them.
  51  *
  52  * If you write modifications of your own for AutoOpts, it is your choice
  53  * whether to permit this exception to apply to your modifications.
  54  * If you do not wish that, delete this exception notice.
  55  */
  56
  57 /* = = = START-STATIC-FORWARD = = = */
  58 /* static forward declarations maintained by :mkfwd */
  59 static void
  60 checkEnvOpt(tOptState * os, char * env_name,
  61             tOptions* pOpts, teEnvPresetType type);
  62 /* = = = END-STATIC-FORWARD = = = */
  63
  64 /*
  65  *  doPrognameEnv - check for preset values from the ${PROGNAME}
  66  *  environment variable.  This is accomplished by parsing the text into
  67  *  tokens, temporarily replacing the arg vector and calling
  68  *  doImmediateOpts and/or doRegularOpts.
  69  */
  70 LOCAL void
  71 doPrognameEnv( tOptions* pOpts, teEnvPresetType type )
  72 {
  73     char const*   pczOptStr = getenv( pOpts->pzPROGNAME );
  74     token_list_t* pTL;
  75     int           sv_argc;
  76     tAoUI         sv_flag;
  77     char**        sv_argv;
  78
  79     /*
  80      *  IF there is no such environment variable
  81      *   *or* there is, but we are doing immediate opts and there are
  82      *        no immediate opts to do (--help inside $PROGNAME is silly,
  83      *        but --no-load-defs is not, so that is marked)
  84      *  THEN bail out now.  (
  85      */
  86     if (  (pczOptStr == NULL)
  87        || (  (type == ENV_IMM)
  88           && ((pOpts->fOptSet & OPTPROC_HAS_IMMED) == 0)  )  )
  89         return;
  90
  91     /*
  92      *  Tokenize the string.  If there's nothing of interest, we'll bail
  93      *  here immediately.
  94      */
  95     pTL = ao_string_tokenize( pczOptStr );
  96     if (pTL == NULL)
  97         return;
  98
  99     /*
 100      *  Substitute our $PROGNAME argument list for the real one
 101      */
 102     sv_argc = pOpts->origArgCt;
 103     sv_argv = pOpts->origArgVect;
 104     sv_flag = pOpts->fOptSet;
 105
 106     /*
 107      *  We add a bogus pointer to the start of the list.  The program name
 108      *  has already been pulled from "argv", so it won't get dereferenced.
 109      *  The option scanning code will skip the "program name" at the start
 110      *  of this list of tokens, so we accommodate this way ....
 111      */
 112     pOpts->origArgVect = (char**)(pTL->tkn_list - 1);
 113     pOpts->origArgCt   = pTL->tkn_ct   + 1;
 114     pOpts->fOptSet    &= ~OPTPROC_ERRSTOP;
 115
 116     pOpts->curOptIdx   = 1;
 117     pOpts->pzCurOpt    = NULL;
 118
 119     switch (type) {
 120     case ENV_IMM:
 121         /*
 122          *  We know the OPTPROC_HAS_IMMED bit is set.
 123          */
 124         (void)doImmediateOpts( pOpts );
 125         break;
 126
 127     case ENV_NON_IMM:
 128         (void)doRegularOpts( pOpts );
 129         break;
 130
 131     default:
 132         /*
 133          *  Only to immediate opts if the OPTPROC_HAS_IMMED bit is set.
 134          */
 135         if (pOpts->fOptSet & OPTPROC_HAS_IMMED) {
 136             (void)doImmediateOpts( pOpts );
 137             pOpts->curOptIdx = 1;
 138             pOpts->pzCurOpt  = NULL;
 139         }
 140         (void)doRegularOpts( pOpts );
 141         break;
 142     }
 143
 144     /*
 145      *  Free up the temporary arg vector and restore the original program args.
 146      */
 147     free( pTL );
 148     pOpts->origArgVect = sv_argv;
 149     pOpts->origArgCt   = sv_argc;
 150     pOpts->fOptSet     = sv_flag;
 151 }
 152
 153 static void
 154 checkEnvOpt(tOptState * os, char * env_name,
 155             tOptions* pOpts, teEnvPresetType type)
 156 {
 157     os->pzOptArg = getenv( env_name );
 158     if (os->pzOptArg == NULL)
 159         return;
 160
 161     os->flags    = OPTST_PRESET | OPTST_ALLOC_ARG | os->pOD->fOptState;
 162     os->optType  = TOPT_UNDEFINED;
 163
 164     if (  (os->pOD->pz_DisablePfx != NULL)
 165        && (streqvcmp( os->pzOptArg, os->pOD->pz_DisablePfx ) == 0)) {
 166         os->flags |= OPTST_DISABLED;
 167         os->pzOptArg = NULL;
 168     }
 169
 170     switch (type) {
 171     case ENV_IMM:
 172         /*
 173          *  Process only immediate actions
 174          */
 175         if (DO_IMMEDIATELY(os->flags))
 176             break;
 177         return;
 178
 179     case ENV_NON_IMM:
 180         /*
 181          *  Process only NON immediate actions
 182          */
 183         if (DO_NORMALLY(os->flags) || DO_SECOND_TIME(os->flags))
 184             break;
 185         return;
 186
 187     default: /* process everything */
 188         break;
 189     }
 190
 191     /*
 192      *  Make sure the option value string is persistent and consistent.
 193      *
 194      *  The interpretation of the option value depends
 195      *  on the type of value argument the option takes
 196      */
 197     if (os->pzOptArg != NULL) {
 198         if (OPTST_GET_ARGTYPE(os->pOD->fOptState) == OPARG_TYPE_NONE) {
 199             os->pzOptArg = NULL;
 200         } else if (  (os->pOD->fOptState & OPTST_ARG_OPTIONAL)
 201                      && (*os->pzOptArg == NUL)) {
 202             os->pzOptArg = NULL;
 203         } else if (*os->pzOptArg == NUL) {
 204             os->pzOptArg = zNil;
 205         } else {
 206             AGDUPSTR( os->pzOptArg, os->pzOptArg, "option argument" );
 207             os->flags |= OPTST_ALLOC_ARG;
 208         }
 209     }
 210
 211     handleOption( pOpts, os );
 212 }
 213
 214 /*
 215  *  doEnvPresets - check for preset values from the envrionment
 216  *  This routine should process in all, immediate or normal modes....
 217  */
 218 LOCAL void
 219 doEnvPresets( tOptions* pOpts, teEnvPresetType type )
 220 {
 221     int        ct;
 222     tOptState  st;
 223     char*      pzFlagName;
 224     size_t     spaceLeft;
 225     char       zEnvName[ AO_NAME_SIZE ];
 226
 227     /*
 228      *  Finally, see if we are to look at the environment
 229      *  variables for initial values.
 230      */
 231     if ((pOpts->fOptSet & OPTPROC_ENVIRON) == 0)
 232         return;
 233
 234     doPrognameEnv( pOpts, type );
 235
 236     ct  = pOpts->presetOptCt;
 237     st.pOD = pOpts->pOptDesc;
 238
 239     pzFlagName = zEnvName
 240         + snprintf( zEnvName, sizeof( zEnvName ), "%s_", pOpts->pzPROGNAME );
 241     spaceLeft = AO_NAME_SIZE - (pzFlagName - zEnvName) - 1;
 242
 243     for (;ct-- > 0; st.pOD++) {
 244         /*
 245          *  If presetting is disallowed, then skip this entry
 246          */
 247         if (  ((st.pOD->fOptState & OPTST_NO_INIT) != 0)
 248            || (st.pOD->optEquivIndex != NO_EQUIVALENT)  )
 249             continue;
 250
 251         /*
 252          *  IF there is no such environment variable,
 253          *  THEN skip this entry, too.
 254          */
 255         if (strlen( st.pOD->pz_NAME ) >= spaceLeft)
 256             continue;
 257
 258         /*
 259          *  Set up the option state
 260          */
 261         strcpy( pzFlagName, st.pOD->pz_NAME );
 262         checkEnvOpt(&st, zEnvName, pOpts, type);
 263     }
 264
 265     /*
 266      *  Special handling for ${PROGNAME_LOAD_OPTS}
 267      */
 268     if (pOpts->specOptIdx.save_opts != 0) {
 269         st.pOD = pOpts->pOptDesc + pOpts->specOptIdx.save_opts + 1;
 270         strcpy( pzFlagName, st.pOD->pz_NAME );
 271         checkEnvOpt(&st, zEnvName, pOpts, type);
 272     }
 273 }
 274
 275 /*
 276  * Local Variables:
 277  * mode: C
 278  * c-file-style: "stroustrup"
 279  * indent-tabs-mode: nil
 280  * End:
 281  * end of autoopts/environment.c */