src/wrapaven.c

   1 /* wrapaven.c
   2  * Set OPENSSL_MODULES to .exe's directory and run real .exe
   3  *
   4  * Copyright (C) 2002,2010,2014,2024 Olly Betts
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <windows.h>
  24
  25 int APIENTRY
  26 wWinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPWSTR lpCmdLine, int nCmdShow)
  27 {
  28    DWORD len = 256;
  29    wchar_t *buf = NULL;
  30    (void)hInst; /* suppress compiler warning */
  31    (void)hPrevInst; /* suppress compiler warning */
  32    while (1) {
  33        DWORD got;
  34        buf = realloc(buf, len * sizeof(wchar_t));
  35        if (!buf) return 1;
  36        got = GetModuleFileNameW(NULL, buf, len);
  37        if (got < len) {
  38            /* Strange Microsoft nastiness - skip prefix "\\?\" if present. */
  39            if (wcsncmp(buf, L"\\\\?\\", 4) == 0) {
  40                buf += 4;
  41                got -= 4;
  42            }
  43            wchar_t *p = wcsrchr(buf, L'\\');
  44            wchar_t *e_val = buf;
  45            size_t e_len;
  46            if (p) {
  47                e_len = p - buf;
  48            } else {
  49                e_val = L".";
  50                e_len = 1;
  51            }
  52            wchar_t *e = malloc((e_len + strlen("OPENSSL_MODULES=") + 1) * sizeof(wchar_t));
  53            if (!e) return 1;
  54            wcscpy(e, L"OPENSSL_MODULES=");
  55            memcpy(e + strlen("OPENSSL_MODULES="), e_val, e_len * sizeof(wchar_t));
  56            e[strlen("OPENSSL_MODULES=") + e_len] = L'\0';
  57            _wputenv(e);
  58            buf[got - 5] = L'_';
  59            break;
  60        }
  61        len += len;
  62    }
  63    /* ShellExecute returns an HINSTANCE for some strange reason - the docs say
  64     * the only valid operation is to convert it to "INT_PTR" (which seems to
  65     * actually be an integer type.  Marvellous. */
  66    if ((INT_PTR)ShellExecuteW(NULL, NULL, buf, lpCmdLine, NULL, nCmdShow) <= 32) {
  67        return 1;
  68    }
  69    return 0;
  70 }