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Annotation of embedaddon/curl/lib/getenv.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
        !             9:  *
        !            10:  * This software is licensed as described in the file COPYING, which
        !            11:  * you should have received as part of this distribution. The terms
        !            12:  * are also available at https://curl.haxx.se/docs/copyright.html.
        !            13:  *
        !            14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
        !            15:  * copies of the Software, and permit persons to whom the Software is
        !            16:  * furnished to do so, under the terms of the COPYING file.
        !            17:  *
        !            18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
        !            19:  * KIND, either express or implied.
        !            20:  *
        !            21:  ***************************************************************************/
        !            22: 
        !            23: #include "curl_setup.h"
        !            24: 
        !            25: #include <curl/curl.h>
        !            26: #include "curl_memory.h"
        !            27: 
        !            28: #include "memdebug.h"
        !            29: 
        !            30: static char *GetEnv(const char *variable)
        !            31: {
        !            32: #if defined(_WIN32_WCE) || defined(CURL_WINDOWS_APP)
        !            33:   (void)variable;
        !            34:   return NULL;
        !            35: #elif defined(WIN32)
        !            36:   /* This uses Windows API instead of C runtime getenv() to get the environment
        !            37:      variable since some changes aren't always visible to the latter. #4774 */
        !            38:   char *buf = NULL;
        !            39:   char *tmp;
        !            40:   DWORD bufsize;
        !            41:   DWORD rc = 1;
        !            42:   const DWORD max = 32768; /* max env var size from MSCRT source */
        !            43: 
        !            44:   for(;;) {
        !            45:     tmp = realloc(buf, rc);
        !            46:     if(!tmp) {
        !            47:       free(buf);
        !            48:       return NULL;
        !            49:     }
        !            50: 
        !            51:     buf = tmp;
        !            52:     bufsize = rc;
        !            53: 
        !            54:     /* It's possible for rc to be 0 if the variable was found but empty.
        !            55:        Since getenv doesn't make that distinction we ignore it as well. */
        !            56:     rc = GetEnvironmentVariableA(variable, buf, bufsize);
        !            57:     if(!rc || rc == bufsize || rc > max) {
        !            58:       free(buf);
        !            59:       return NULL;
        !            60:     }
        !            61: 
        !            62:     /* if rc < bufsize then rc is bytes written not including null */
        !            63:     if(rc < bufsize)
        !            64:       return buf;
        !            65: 
        !            66:     /* else rc is bytes needed, try again */
        !            67:   }
        !            68: #else
        !            69:   char *env = getenv(variable);
        !            70:   return (env && env[0])?strdup(env):NULL;
        !            71: #endif
        !            72: }
        !            73: 
        !            74: char *curl_getenv(const char *v)
        !            75: {
        !            76:   return GetEnv(v);
        !            77: }