/*
* Automated Testing Framework (atf)
*
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <ctype.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>

#include "atf-c/config.h"

#include "detail/env.h"
#include "detail/sanity.h"

static bool initialized = false;

static struct var {
   const char *name;
   const char *default_value;
   const char *value;
   bool can_be_empty;
} vars[] = {
   { "atf_build_cc",       ATF_BUILD_CC,       NULL, false, },
   { "atf_build_cflags",   ATF_BUILD_CFLAGS,   NULL, true,  },
   { "atf_build_cpp",      ATF_BUILD_CPP,      NULL, false, },
   { "atf_build_cppflags", ATF_BUILD_CPPFLAGS, NULL, true,  },
   { "atf_build_cxx",      ATF_BUILD_CXX,      NULL, false, },
   { "atf_build_cxxflags", ATF_BUILD_CXXFLAGS, NULL, true,  },
   { "atf_includedir",     ATF_INCLUDEDIR,     NULL, false, },
   { "atf_libexecdir",     ATF_LIBEXECDIR,     NULL, false, },
   { "atf_pkgdatadir",     ATF_PKGDATADIR,     NULL, false, },
   { "atf_shell",          ATF_SHELL,          NULL, false, },
   { "atf_workdir",        ATF_WORKDIR,        NULL, false, },
   { NULL,                 NULL,               NULL, false, },
};

/* Only used for unit testing, so this prototype is private. */
void __atf_config_reinit(void);

/* ---------------------------------------------------------------------
* Auxiliary functions.
* --------------------------------------------------------------------- */

static
char *
string_to_upper(const char *str)
{
   char *uc;

   uc = (char *)malloc(strlen(str) + 1);
   if (uc != NULL) {
       char *ucptr = uc;
       while (*str != '\0') {
           *ucptr = toupper((int)*str);

           str++;
           ucptr++;
       }
       *ucptr = '\0';
   }

   return uc;
}

static
void
initialize_var(struct var *var, const char *envname)
{
   PRE(var->value == NULL);

   if (atf_env_has(envname)) {
       const char *val = atf_env_get(envname);
       if (strlen(val) > 0 || var->can_be_empty)
           var->value = val;
       else
           var->value = var->default_value;
   } else
       var->value = var->default_value;

   POST(var->value != NULL);
}

static
void
initialize(void)
{
   struct var *var;

   PRE(!initialized);

   for (var = vars; var->name != NULL; var++) {
       char *envname;

       envname = string_to_upper(var->name);
       initialize_var(var, envname);
       free(envname);
   }

   initialized = true;
}

/* ---------------------------------------------------------------------
* Free functions.
* --------------------------------------------------------------------- */

const char *
atf_config_get(const char *name)
{
   const struct var *var;
   const char *value;

   if (!initialized) {
       initialize();
       INV(initialized);
   }

   value = NULL;
   for (var = vars; value == NULL && var->name != NULL; var++)
       if (strcmp(var->name, name) == 0)
           value = var->value;
   INV(value != NULL);

   return value;
}

void
__atf_config_reinit(void)
{
   struct var *var;

   initialized = false;

   for (var = vars; var->name != NULL; var++)
       var->value = NULL;
}