Have a workaround for missing mmap() in fexc.c and pio.c

By defining NO_MMAP it's now possible to avoid the usage of
mmap() and munmap(). This benefits platforms that don't support
these functions, e.g. Windows.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Makefile

@@ -100,6 +100,10 @@ sunxi-fexc: fexc.h script.h script.c \
 LIBUSB = libusb-1.0
 LIBUSB_CFLAGS = `pkg-config --cflags $(LIBUSB)`
 LIBUSB_LIBS = `pkg-config --libs $(LIBUSB)`
+ifeq ($(OS),Windows_NT)
+	# Windows lacks mman.h / mmap()
+	DEFINES += -DNO_MMAP
+endif
 
 sunxi-fel: fel.c fel-to-spl-thunk.h progress.c progress.h
 	$(CC) $(CFLAGS) $(LIBUSB_CFLAGS) $(LDFLAGS) -o $@ $(filter %.c,$^) $(LIBS) $(LIBUSB_LIBS)

fexc.c

@@ -21,7 +21,9 @@
 #include <libgen.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/mman.h>
+#ifndef NO_MMAP
+  #include <sys/mman.h>
+#endif
 #include <sys/stat.h>
 #include <unistd.h>
 #include <fcntl.h>
@@ -117,6 +119,7 @@ static inline int script_parse(enum script_format format,
 			pr_err("%s: %s: %s\n", filename,
 			       "fstat", strerror(errno));
 			goto bin_close;
+#ifndef NO_MMAP
 		} else if (S_ISREG(sb.st_mode)) {
 			/* regular file, mmap it */
 			bin = mmap(0, sb.st_size, PROT_READ, MAP_SHARED, in, 0);
@@ -127,6 +130,7 @@ static inline int script_parse(enum script_format format,
 			}
 			bin_size = sb.st_size;
 			allocated = 0;
+#endif
 		} else {
 			/* something else... just read it all! */
 			bin = read_all(in, filename, &bin_size);
@@ -138,10 +142,12 @@ static inline int script_parse(enum script_format format,
 		ret = script_decompile_bin(bin, bin_size, filename, script);
 		if (allocated)
 			free(bin);
+#ifndef NO_MMAP
 		else if (munmap(bin, bin_size) == -1) {
 			pr_err("%s: %s: %s\n", filename,
 			       "munmap", strerror(errno));
 		}
+#endif
 bin_close:
 		close(in);
 		}; break;

pio.c

@@ -24,7 +24,9 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <errno.h>
-#include <sys/mman.h>
+#ifndef NO_MMAP
+  #include <sys/mman.h>
+#endif
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -365,6 +367,10 @@ int main(int argc, char **argv)
 	if (!in_name && !do_mmap)
 		usage(1);
 	if (do_mmap) {
+#ifdef NO_MMAP
+		errno = ENOSYS; /* Function not implemented */
+		perror("mmap PIO");
+#else
 		int pagesize = sysconf(_SC_PAGESIZE);
 		int fd = open("/dev/mem",O_RDWR);
 		int addr = 0x01c20800 & ~(pagesize-1);
@@ -380,6 +386,7 @@ int main(int argc, char **argv)
 		}
 		close(fd);
 		buf += offset;
+#endif
 	}
 	if (in_name) {
 		if (strcmp(in_name, "-") == 0) {