Add subsurface_access()

For our usage the method will acept UTF-8 paths,
which are converted to UTF-16 on Win32.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

dive.h

@@ -653,6 +653,7 @@ extern int subsurface_rename(const char *path, const char *newpath);
 extern int subsurface_open(const char *path, int oflags, mode_t mode);
 extern FILE *subsurface_fopen(const char *path, const char *mode);
 extern void *subsurface_opendir(const char *path);
+extern int subsurface_access(const char *path, int mode);
 extern struct zip *subsurface_zip_open_readonly(const char *path, int flags, int *errorp);
 extern int subsurface_zip_close(struct zip *zip);
 extern void subsurface_console_init(bool dedicated);

libdivecomputer.c

@@ -849,7 +849,7 @@ const char *do_libdivecomputer_import(device_data_t *data)
 		err = do_device_import(data);
 		/* TODO: Show the logfile to the user on error. */
 		dc_device_close(data->device);
-	} else if (access(data->devname, R_OK | W_OK) != 0)
+	} else if (subsurface_access(data->devname, R_OK | W_OK) != 0)
 		err = translate("gettextFromC", "Insufficient privileges to open the device %s %s (%s)");
 
 	dc_context_free(data->context);

linux.c

@@ -164,6 +164,11 @@ void *subsurface_opendir(const char *path)
 	return (void *)opendir(path);
 }
 
+int subsurface_access(const char *path, int mode)
+{
+	return access(path, mode);
+}
+
 struct zip *subsurface_zip_open_readonly(const char *path, int flags, int *errorp)
 {
 	return zip_open(path, flags, errorp);

macos.c

@@ -11,7 +11,7 @@
 #include <sys/syslimits.h>
 #include <stdio.h>
 #include <fcntl.h>
-#include <dirent.h>
+#include <unistd.h>
 
 void subsurface_user_info(struct user_info *info)
 { /* Nothing, let's use libgit2-20 on MacOS */ }
@@ -147,6 +147,11 @@ void *subsurface_opendir(const char *path)
 	return (void *)opendir(path);
 }
 
+int subsurface_access(const char *path, int mode)
+{
+	return access(path, mode);
+}
+
 struct zip *subsurface_zip_open_readonly(const char *path, int flags, int *errorp)
 {
 	return zip_open(path, flags, errorp);

windows.c

@@ -1,5 +1,6 @@
 /* windows.c */
 /* implements Windows specific functions */
+#include <io.h>
 #include "dive.h"
 #include "display.h"
 #undef _WIN32_WINNT
@@ -235,6 +236,18 @@ void *subsurface_opendir(const char *path)
 	return (void *)ret;
 }
 
+int subsurface_access(const char *path, int mode)
+{
+	int ret = -1;
+	if (!path)
+		return ret;
+	wchar_t *wpath = utf8_to_utf16(path);
+	if (wpath)
+		ret = _waccess(wpath, mode);
+	free((void *)wpath);
+	return ret;
+}
+
 #ifndef O_BINARY
 #define O_BINARY 0
 #endif