view src/SDL_getenv.c @ 1143:71a2648acc75

Replaced Mac OS X's C++ cdrom code with almost-direct translation to C. Sam requested this effort on the mailing list, apparently because of binary compatibility issues between 10.4 and earlier systems (or gcc4 and earlier compilers?). Works fine with SDL12/test/testcdrom.c, with this command line: ./testcdrom -status -list -play -sleep 5000 -pause -sleep 3000 -resume \ -sleep 5000 -stop -sleep 3000 -play -sleep 3000 -stop \ -sleep 3000 -eject Unix Makefiles work, XCode project still need updating for new filenames.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 22 Sep 2005 08:48:16 +0000
parents b8d311d90021
children f098b247299d
line wrap: on
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

/* Not all environments have a working getenv()/putenv() */

#ifdef TEST_MAIN
#define NEED_SDL_GETENV
#endif

#include "SDL_getenv.h"

#ifdef NEED_SDL_GETENV

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

static char **SDL_env = (char **)0;

/* Put a variable of the form "name=value" into the environment */
int SDL_putenv(const char *variable)
{
	const char *name, *value;
	int added;
	int len, i;
	char **new_env;
	char *new_variable;

	/* A little error checking */
	if ( ! variable ) {
		return(-1);
	}
	name = variable;
	for ( value=variable; *value && (*value != '='); ++value ) {
		/* Keep looking for '=' */ ;
	}
	if ( *value ) {
		++value;
	} else {
		return(-1);
	}

	/* Allocate memory for the variable */
	new_variable = (char *)malloc(strlen(variable)+1);
	if ( ! new_variable ) {
		return(-1);
	}
	strcpy(new_variable, variable);

	/* Actually put it into the environment */
	added = 0;
	i = 0;
	if ( SDL_env ) {
		/* Check to see if it's already there... */
		len = (value - name);
		for ( ; SDL_env[i]; ++i ) {
			if ( strncmp(SDL_env[i], name, len) == 0 ) {
				break;
			}
		}
		/* If we found it, just replace the entry */
		if ( SDL_env[i] ) {
			free(SDL_env[i]);
			SDL_env[i] = new_variable;
			added = 1;
		}
	}

	/* Didn't find it in the environment, expand and add */
	if ( ! added ) {
		new_env = realloc(SDL_env, (i+2)*sizeof(char *));
		if ( new_env ) {
			SDL_env = new_env;
			SDL_env[i++] = new_variable;
			SDL_env[i++] = (char *)0;
			added = 1;
		} else {
			free(new_variable);
		}
	}
	return (added ? 0 : -1);
}

/* Retrieve a variable named "name" from the environment */
char *SDL_getenv(const char *name)
{
	int len, i;
	char *value;

	value = (char *)0;
	if ( SDL_env ) {
		len = strlen(name);
		for ( i=0; SDL_env[i] && !value; ++i ) {
			if ( (strncmp(SDL_env[i], name, len) == 0) &&
			     (SDL_env[i][len] == '=') ) {
				value = &SDL_env[i][len+1];
			}
		}
	}
	return value;
}

#endif /* NEED_GETENV */

#ifdef TEST_MAIN
#include <stdio.h>

int main(int argc, char *argv[])
{
	char *value;

	printf("Checking for non-existent variable... ");
	fflush(stdout);
	if ( ! getenv("EXISTS") ) {
		printf("okay\n");
	} else {
		printf("failed\n");
	}
	printf("Setting FIRST=VALUE1 in the environment... ");
	fflush(stdout);
	if ( putenv("FIRST=VALUE1") == 0 ) {
		printf("okay\n");
	} else {
		printf("failed\n");
	}
	printf("Getting FIRST from the environment... ");
	fflush(stdout);
	value = getenv("FIRST");
	if ( value && (strcmp(value, "VALUE1") == 0) ) {
		printf("okay\n");
	} else {
		printf("failed\n");
	}
	printf("Setting SECOND=VALUE2 in the environment... ");
	fflush(stdout);
	if ( putenv("SECOND=VALUE2") == 0 ) {
		printf("okay\n");
	} else {
		printf("failed\n");
	}
	printf("Getting SECOND from the environment... ");
	fflush(stdout);
	value = getenv("SECOND");
	if ( value && (strcmp(value, "VALUE2") == 0) ) {
		printf("okay\n");
	} else {
		printf("failed\n");
	}
	printf("Setting FIRST=NOVALUE in the environment... ");
	fflush(stdout);
	if ( putenv("FIRST=NOVALUE") == 0 ) {
		printf("okay\n");
	} else {
		printf("failed\n");
	}
	printf("Getting FIRST from the environment... ");
	fflush(stdout);
	value = getenv("FIRST");
	if ( value && (strcmp(value, "NOVALUE") == 0) ) {
		printf("okay\n");
	} else {
		printf("failed\n");
	}
	printf("Checking for non-existent variable... ");
	fflush(stdout);
	if ( ! getenv("EXISTS") ) {
		printf("okay\n");
	} else {
		printf("failed\n");
	}
	return(0);
}
#endif /* TEST_MAIN */