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/* Copyright (C) 2000-2006 Damir Zucic */
/*=============================================================================
open_cfg_file.c
Purpose:
Open configuration file. Up to seven directories are searched. If all
attempts fail, return NULL.
Input:
(1) Environment variable HOME used.
Output:
(1) Return value.
Return value:
(1) File pointer, if file found.
(2) NULL, if all attempts to find file failed.
Notes:
(1) The following seven pathnames will be checked, if necessary:
(1) ./.garlicrc (current working directory)
(2) $HOME/.garlicrc (home directory)
(3) $HOME/garlic/.garlicrc
(4) /usr/share/garlic/.garlicrc (recomm. system-wide default!)
(5) /etc/garlicrc (note: file name is garlicrc !)
(6) /usr/local/lib/garlic/.garlicrc
(7) /usr/lib/garlic/.garlicrc
========includes:============================================================*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "defines.h"
/*======try to find and open .garlicrc file:=================================*/
FILE *OpenConfigFile_ (void)
{
static FILE *fileP;
static char tildaA[10] = "~";
char *home_dirP;
int n;
char config_file_nameA[STRINGSIZE];
/* The first attempt - try to find .garlicrc file in current directory: */
if ((fileP = fopen (".garlicrc", "r")) != NULL)
{
return fileP;
}
/* The second attempt - try to find .garlicrc file in users home directory: */
do
{
if ((home_dirP = getenv ("HOME")) != NULL) break;
if ((home_dirP = getenv ("home")) != NULL) break;
home_dirP = tildaA;
} while (0);
n = STRINGSIZE - 100;
strncpy (config_file_nameA, home_dirP, n);
config_file_nameA[n] = '\0';
strncat (config_file_nameA, "/.garlicrc", 11);
config_file_nameA[STRINGSIZE - 1] = '\0';
if ((fileP = fopen (config_file_nameA, "r")) != NULL)
{
return fileP;
}
/* The third attempt - try to find personal file in $HOME/garlic directory: */
n = STRINGSIZE - 100;
strncpy (config_file_nameA, home_dirP, n);
config_file_nameA[n] = '\0';
strncat (config_file_nameA, "/garlic/.garlicrc", 18);
config_file_nameA[STRINGSIZE - 1] = '\0';
if ((fileP = fopen (config_file_nameA, "r")) != NULL)
{
return fileP;
}
/* The fourth attempt - /usr/share/garlic/.garlicrc . */
/* This pathname is recommended as system-wide default! */
if ((fileP = fopen ("/usr/share/garlic/.garlicrc", "r")) != NULL)
{
return fileP;
}
/* The fifth attempt - /etc/garlicrc, default for */
/* Debian Linux (the file name is garlicrc !): */
if ((fileP = fopen ("/etc/garlicrc", "r")) != NULL)
{
return fileP;
}
/* The sixth attempt - /usr/local/lib/garlic directory: */
if ((fileP = fopen ("/usr/local/lib/garlic/.garlicrc", "r")) != NULL)
{
return fileP;
}
/* The seventh attempt - /usr/lib/garlic directory: */
if ((fileP = fopen ("/usr/lib/garlic/.garlicrc", "r")) != NULL)
{
return fileP;
}
/* If this point is reached, all attempts to */
/* open the configuration file have failed: */
return NULL;
}
/*===========================================================================*/
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