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beard%netscape.com 2000-08-26 02:58:29 +00:00
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/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Mozilla browser.
*
* The Initial Developer of the Original Code is Netscape
* Communications, Inc. Portions created by Netscape are
* Copyright (C) 1999, Mozilla. All Rights Reserved.
*
* Contributor(s):
* Patrick Beard <beard@netscape.com>
*/
/*
This file must precede sysenv.c in the link order, so that this implementation of
getenv() will override Metrowerks' standard, useless version.
*/
#ifdef DEBUG
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
/**
* Provide a simple environment variable table, that gets loaded once per run of a program.
*/
class Environment {
public:
Environment();
~Environment();
char* get(const char* name);
private:
struct Variable {
Variable* mNext;
char* mName;
char* mValue;
Variable(const char* name, const char* value)
: mNext(NULL), mName(NULL), mValue(NULL)
{
mName = new char[::strlen(name) + 1];
if (mName != NULL)
::strcpy(mName, name);
if (value != NULL) {
mValue = new char[::strlen(value) + 1];
if (mValue != NULL)
::strcpy(mValue, value);
}
}
~Variable() {
if (mName) delete[] mName;
if (mValue) delete[] mValue;
}
};
Variable* mVariables;
};
Environment::Environment()
: mVariables(NULL)
{
// opens "ENVIRONMENT" file in current application's directory.
FILE* f = ::fopen("ENVIRONMENT", "r");
if (f != NULL) {
char line[1024];
while (::fgets(line, sizeof(line), f) != NULL) {
// allow comments starting with "#" or "//"
if (line[0] == '#' || (line[0] == '/' && line[1] == '/'))
continue;
// trim trailing linefeed.
int len = ::strlen(line);
if (line[len - 1] == '\n')
line[--len] = '\0';
// ignore leading white space.
char* name = line;
while (isspace(*name)) ++name;
// look for value.
char* value = "1";
char* eq = ::strchr(name, '=');
if (eq != NULL) {
value = eq + 1;
*eq = '\0';
}
Variable* var = new Variable(name, value);
var->mNext = mVariables;
mVariables = var;
}
::fclose(f);
}
}
Environment::~Environment()
{
Variable* var = mVariables;
while (var != NULL) {
Variable* next = var->mNext;
delete var;
var = next;
}
}
char* Environment::get(const char* name)
{
Variable** link = &mVariables;
Variable* var = *link;
while (var != NULL) {
if (::strcmp(var->mName, name) == 0)
return var->mValue;
link = &var->mNext;
var = *link;
}
return NULL;
}
char* std::getenv(const char * name)
{
static Environment env;
return env.get(name);
}
#endif /* DEBUG */