Mercurial > sdl-ios-xcode
diff src/stdlib/SDL_getenv.c @ 1330:450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
using Visual C++ 2005
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Mon, 06 Feb 2006 08:28:51 +0000 |
parents | |
children | 1cbaeee565b1 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/stdlib/SDL_getenv.c Mon Feb 06 08:28:51 2006 +0000 @@ -0,0 +1,245 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2006 Sam Lantinga + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + + Sam Lantinga + slouken@libsdl.org +*/ + +#include "SDL_stdlib.h" +#include "SDL_string.h" + + +#if defined(WIN32) && !defined(_WIN32_WCE) + +#include "SDL_windows.h" +#include "SDL_string.h" + +/* Note this isn't thread-safe! */ + +static char *SDL_envmem = NULL; /* Ugh, memory leak */ +static DWORD SDL_envmemlen = 0; + +/* Put a variable of the form "name=value" into the environment */ +int SDL_putenv(const char *variable) +{ + DWORD bufferlen; + char *value; + const char *sep; + + sep = strchr(variable, '='); + if ( sep == NULL ) { + return -1; + } + bufferlen = strlen(variable)+1; + if ( bufferlen > SDL_envmemlen ) { + char *newmem = (char *)realloc(SDL_envmem, bufferlen); + if ( newmem == NULL ) { + return -1; + } + SDL_envmem = newmem; + SDL_envmemlen = bufferlen; + } + strcpy(SDL_envmem, variable); + value = SDL_envmem + (sep - variable); + *value++ = '\0'; + if ( !SetEnvironmentVariable(SDL_envmem, *value ? value : NULL) ) { + return -1; + } + return 0; +} + +/* Retrieve a variable named "name" from the environment */ +char *SDL_getenv(const char *name) +{ + DWORD bufferlen; + + bufferlen = GetEnvironmentVariable(name, SDL_envmem, SDL_envmemlen); + if ( bufferlen == 0 ) { + return NULL; + } + if ( bufferlen > SDL_envmemlen ) { + char *newmem = (char *)realloc(SDL_envmem, bufferlen); + if ( newmem == NULL ) { + return NULL; + } + SDL_envmem = newmem; + SDL_envmemlen = bufferlen; + GetEnvironmentVariable(name, SDL_envmem, SDL_envmemlen); + } + return SDL_envmem; +} + +#else /* roll our own */ + +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 /* WIN32 */ + +#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 */ +