Fix setenv/unsetenv link errors by implementing a local version using Windows SetEnvironmentVariable.

Untested, and does not comply with the error returns per setenv.

contrib/win32/nfc_win32.c

@@ -0,0 +1,48 @@
+/*-
+ * Public platform independent Near Field Communication (NFC) library
+ *
+ * Copyright (C) 2013 Alex Lian
+ *
+ * This program 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 3 of the License, or (at your
+ * option) any later version.
+ *
+ * This program 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 General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+/**
+ * @file nfc_win32.c
+ * @brief Windows System compatibility
+ */
+
+// Handle platform specific includes
+#include "contrib/windows.h"
+
+int setenv(const char *name, const char *value, int overwrite)
+{
+  int exists = GetEnvironmentVariableA(name, NULL, 0);
+  if ((exists && overwrite) || (!exists))
+  {
+    if (!SetEnvironmentVariableA(name, value))
+    {
+      // Set errno here correctly
+      return -1;
+    }
+    return 0;
+  }
+  // Exists and overwrite is 0.
+  return -1;
+}
+
+void unsetenv(const char *name)
+{
+  SetEnvironmentVariableA(name, NULL);
+}

contrib/windows.h

@@ -45,4 +45,11 @@
 #    define strdup _strdup
 #  endif
 
+/* 
+ * setenv and unsetenv are not Windows compliant nor implemented in MinGW.
+ * These declarations get rid of the "implicit declaration warning."
+ */
+int setenv(const char *name, const char *value, int overwrite);
+void unsetenv(const char *name);
+
 #endif

libnfc/CMakeLists.txt

@@ -1,3 +1,11 @@
+# Windows MinGW workarounds
+IF(WIN32)
+  message("Adding in contrib win32 sources")
+  SET(WINDOWS_SOURCES ../contrib/win32/nfc_win32)
+  INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/../contrib/win32)
+  message("Win32: " ${WINDOWS_SOURCES})
+ENDIF(WIN32)
+
 # Library's chips
 SET(CHIPS_SOURCES chips/pn53x)
 INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/chips)
@@ -29,7 +37,7 @@ IF(LIBUSB_FOUND)
 ENDIF(LIBUSB_FOUND)
 
 # Library
-SET(LIBRARY_SOURCES nfc nfc-device nfc-emulation nfc-internal conf iso14443-subr mirror-subr target-subr ${DRIVERS_SOURCES} ${BUSES_SOURCES} ${CHIPS_SOURCES})
+SET(LIBRARY_SOURCES nfc nfc-device nfc-emulation nfc-internal conf iso14443-subr mirror-subr target-subr log ${DRIVERS_SOURCES} ${BUSES_SOURCES} ${CHIPS_SOURCES} ${WINDOWS_SOURCES})
 INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR})
 IF(LIBNFC_DEBUG_OUTPUT)
   LIST(APPEND LIBRARY_SOURCES log-printf)