Mercurial > sdl-ios-xcode
view src/SDL_getenv.c @ 911:04a403e4ccf5
Date: Mon, 3 May 2004 03:15:01 +0100
From: David Symmonds
Subject: SDL Typedef Structs
Hi, Thanks for the SDL libraries, I have been using them for about a year
now and they are really brilliant. One thing that I have just found whilst
using them through C++ (and needing forward declarations) is that when you
typedef structs you sometimes use
typedef struct Name
{
...
}Name;
e.g. SDL_Surface
and other times use
typedef struct
{
...
}Name;
e.g. SDL_Rect
The first type works fine, when I define a header file I can just put
'struct Name;' at the top and use the Name throughout. However, the second
type is harder to use in a header, and I haven't found a way yet, other than
to include 'SDL.h' in the header file (undesirable). Would there be any harm
in changing the definition of SDL_Rect and such like to the second form?
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Sun, 18 Jul 2004 22:57:40 +0000 |
parents | b8d311d90021 |
children | f098b247299d |
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line source
/* 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 */