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csvar.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1990-2007 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * Glenn Fowler
 * AT&T Research
 *
 * run time cs var support
 */

#include "cslib.h"

#ifndef TRUST
#define TRUST           "/usr/local:/usr" /* trusted root dirs          */
#endif

typedef struct
{
      const char* name;
      const char* trust;
      const char* value;
} Var_t;

static Var_t      var[] =
{

{ /* CS_VAR_LOCAL */ "CS_MOUNT_LOCAL", "/tmp/cs"                  },
{ /* CS_VAR_PROXY */ "CS_MOUNT_PROXY", "/dev/tcp/proxy/inet.proxy"      },
{ /* CS_VAR_SHARE */ "CS_MOUNT_SHARE", "share/lib/cs"             },
{ /* CS_VAR_TRUST */ "CS_MOUNT_TRUST", TRUST                      },

};

char*
csvar(Cs_t* state, int index, int trust)
{
      register char*    s;
      register Var_t*   p;

      if (index < 0 || index >= elementsof(var))
            return 0;
      p = &var[index];
      if (!p->name || trust)
            return (char*)p->trust;
      if (!p->value)
            p->value = ((s = getenv(p->name)) && *s) ? (const char*)s : p->trust;
      return (char*)p->value;
}

char*
_cs_var(int index, int trust)
{
      return csvar(&cs, index, trust);
}

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