Support for MSVC. Use _WIN32 instead of __MINGW32__

This is not a search and replace of __MING32__ with _WIN32.
There are places where __MINGW32__ is still used and all changes are
tested with MSVC 2019 compiler. Although, this commit alone will not work
on MSVC because there are plenty of other things to be done which are
seperated into multiple PR. PR OSGeo#289 is the one that "works" on MSVC and
unix as well. But that contains too many changes which shouldn't in a single
PR. Even though this PR alone won't compile GRASS GIS on MSVC, it sure will
not break existing compilers which I think is very important.

Complete support for MSVC will be ready after 2/3 PRs

OSGeo#289

Author: rkanavath

db/drivers/odbc/odbc.h

@@ -1,7 +1,7 @@
 #ifndef _ODBC_H_
 #define	_ODBC_H_
 
-#ifdef __MINGW32__
+#ifdef _WIN32
  #include <windows.h>
 #endif
 

include/gis.h

@@ -61,7 +61,7 @@ static const char *GRASS_copyright __attribute__ ((unused))
 
 /*! \brief Cross-platform Newline Character */
 #define NEWLINE     '\n'
-#ifdef __MINGW32__
+#ifdef _WIN32
 #  define HOST_NEWLINE "\r\n"
 #else
 #  define HOST_NEWLINE "\n"
@@ -194,7 +194,7 @@ static const char *GRASS_copyright __attribute__ ((unused))
 
 /* Cross-platform Directory Separator Character and null device stuff */
 #define GRASS_DIRSEP '/'
-#ifdef __MINGW32__
+#ifdef _WIN32
 #  define HOST_DIRSEP '\\'
 #  define G_DEV_NULL "NUL:"
 #else
@@ -593,7 +593,7 @@ typedef float FCELL;
 #if HAVE_INT64_T
 #include <sys/types.h>
 typedef int64_t grass_int64;
-#elif defined(__MINGW32__)
+#elif defined(_WIN32)
 typedef __int64 grass_int64;
 #elif HAVE_LONG_LONG_INT
 typedef long long int grass_int64;

include/iostream/rtimer.h

@@ -38,13 +38,14 @@
 #ifndef RTIMER_H
 #define RTIMER_H
 
-#ifdef __MINGW32__
+#ifdef _WIN32
 
 #include <time.h>
 #include <stdio.h>
 #include <string.h>
+#ifdef __MINGW32__
 #include <strings.h>
-
+#endif
 typedef struct {
   time_t tv1, tv2;
 } Rtimer;

lib/cairodriver/graph.c

@@ -29,7 +29,7 @@
 #endif
 
 #include <unistd.h>
-#ifndef __MINGW32__
+#ifndef _WIN32
 #include <fcntl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -390,7 +390,7 @@ static int ends_with(const char *string, const char *suffix)
 
 static void map_file(void)
 {
-#ifndef __MINGW32__
+#ifndef _WIN32
     size_t size = HEADER_SIZE + ca.width * ca.height * sizeof(unsigned int);
     void *ptr;
     int fd;

lib/calc/calc.c

@@ -21,7 +21,7 @@ static RETSIGTYPE handle_fpe(int n)
 
 void pre_exec(void)
 {
-#ifndef __MINGW32__
+#ifndef _WIN32
 #ifdef SIGFPE
     struct sigaction act;
 
@@ -38,7 +38,7 @@ void pre_exec(void)
 
 void post_exec(void)
 {
-#ifndef __MINGW32__
+#ifndef _WIN32
 #ifdef SIGFPE
     struct sigaction act;
 

lib/db/dbmi_base/dbmscap.c

@@ -158,7 +158,7 @@ dbDbmscap *db_read_dbmscap(void)
     /* START OF NEW CODE FOR SEARCH IN $(GISBASE)/driver/db/ */
 
     /* opend db drivers directory */
-#ifdef __MINGW32__
+#ifdef _WIN32
     dirpath = G_malloc(strlen("\\driver\\db\\") + strlen(G_gisbase()) + 1);
     sprintf(dirpath, "%s\\driver\\db\\", G_gisbase());
     G_convert_dirseps_to_host(dirpath);
@@ -182,7 +182,7 @@ dbDbmscap *db_read_dbmscap(void)
 	    || (strcmp(ent->d_name, "..") == 0))
 	    continue;
 
-#ifdef __MINGW32__
+#ifdef _WIN32
 	/* skip manifest files on Windows */
 	if (strstr(ent->d_name, ".manifest"))
 	    continue;
@@ -191,7 +191,7 @@ dbDbmscap *db_read_dbmscap(void)
 	/* Remove '.exe' from name (windows extension) */
 	name = G_str_replace(ent->d_name, ".exe", "");
 
-#ifdef __MINGW32__
+#ifdef _WIN32
 	dirpath = G_malloc(strlen("\\driver\\db\\")
 			   + strlen(G_gisbase()) + strlen(ent->d_name) + 1);
 	sprintf(dirpath, "%s\\driver\\db\\%s", G_gisbase(), ent->d_name);

lib/db/dbmi_client/start.c

@@ -16,7 +16,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 
-#ifdef __MINGW32__
+#ifdef _WIN32
 #include <windows.h>
 #include <process.h>
 #include <fcntl.h>
@@ -30,7 +30,7 @@
 
 static void close_on_exec(int fd)
 {
-#ifndef __MINGW32__
+#ifndef _WIN32
     int flags = fcntl(fd, F_GETFD);
     fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
 #endif
@@ -129,7 +129,7 @@ dbDriver *db_start_driver(const char *name)
 
     /* run the driver as a child process and create pipes to its stdin, stdout */
 
-#ifdef __MINGW32__
+#ifdef _WIN32
 #define pipe(fds) _pipe(fds, 250000, _O_BINARY | _O_NOINHERIT)
 #endif
 

lib/gis/mapset_msc.c

@@ -119,7 +119,7 @@ int G__make_mapset_element_misc(const char *dir, const char *name)
 
 static int check_owner(const struct stat *info)
 {
-#if defined(__MINGW32__) || defined(SKIP_MAPSET_OWN_CHK)
+#if defined(_WIN32) || defined(SKIP_MAPSET_OWN_CHK)
     return 1;
 #else
     const char *check = getenv("GRASS_SKIP_MAPSET_OWNER_CHECK");

lib/gis/paths.c

@@ -3,7 +3,7 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
-#ifndef __MINGW32__
+#ifndef _WIN32
 #include <pwd.h>
 #else
 #include <windows.h>
@@ -26,7 +26,7 @@
 
 int G_mkdir(const char *path)
 {
-#ifdef __MINGW32__
+#ifdef _WIN32
     return mkdir(path);
 #else
     return mkdir(path, 0777);
@@ -62,7 +62,7 @@ int G_is_dirsep(char c)
 int G_is_absolute_path(const char *path)
 {
     if (G_is_dirsep(path[0])
-#ifdef __MINGW32__
+#ifdef _WIN32
 	|| (isalpha(path[0]) && (path[1] == ':') && G_is_dirsep(path[2]))
 #endif
 	)
@@ -144,7 +144,7 @@ int G_stat(const char *file_name, struct stat *buf)
 
 int G_lstat(const char *file_name, struct stat *buf)
 {
-#ifdef __MINGW32__
+#ifdef _WIN32
     return stat(file_name, buf);
 #else
     return lstat(file_name, buf);
@@ -164,7 +164,7 @@ int G_lstat(const char *file_name, struct stat *buf)
 int G_owner(const char *path)
 {
 
-#ifndef __MINGW32__
+#ifndef _WIN32
     struct stat info;
 
     G_stat(path, &info);

lib/gis/popen.c

@@ -6,7 +6,7 @@
 #include <grass/gis.h>
 #include <grass/spawn.h>
 
-#ifdef __MINGW32__
+#ifdef _WIN32
 #include <io.h>
 #include <fcntl.h>
 #define pipe(fds) _pipe(fds, 4096, O_BINARY|O_NOINHERIT)