Make some corrections.

jni/Android.mk

@@ -46,4 +46,4 @@ endif
 
 include $(BUILD_EXECUTABLE)
 
-# end
+# end

jni/docs.c

@@ -25,7 +25,7 @@ extern "C" {
 
 extern char* bin_name;
 
-void licenses()
+void licenses(void)
 {
     printf("Copyright 2024 Partition Manager\n");
     printf("Licensed under the Apache License, Version 2.0 (the \"License\");\n");
@@ -38,7 +38,7 @@ void licenses()
     printf("See the License for the specific language governing permissions and limitations under the License.\n");
 }
 
-void help()
+void help(void)
 {
     printf("Usage: \n");
     printf("   %s backup PARTITION [OUTPUT] [OPTIONS]...\n", bin_name);

jni/include/pmt-docs.h

@@ -16,15 +16,11 @@
  * limitations under the License.
  */
 
-#if defined(__cplusplus)
-extern "C" {
-#endif /* __cplusplus */
+__BEGIN_DECLS
 
-void help();
-void licenses();
+void help(void);
+void licenses(void);
 
-#if defined(__cplusplus)
-}
-#endif /* __cplusplus */
+__END_DECLS
 
 /* end */

jni/include/pmt-versioning.h

@@ -16,17 +16,13 @@
  * limitations under the License.
  */
 
-#if defined(__cplusplus)
-extern "C" {
-#endif /* __cplusplus */
+__BEGIN_DECLS
 
 /* versioning */
 #define PMT_MAJOR            2
 #define PMT_MINOR            1
 #define PMT_PATCHLEVEL       0
 
-#if defined(__cplusplus)
-}
-#endif /* __cplusplus */
+__END_DECLS
 
 /* end */

jni/include/pmt.h

@@ -16,9 +16,7 @@
  * limitations under the License.
  */
 
-#if defined(__cplusplus)
-extern "C" {
-#endif
+__BEGIN_DECLS
 
 #if !defined(__PMT_H_)
 #define __PMT_H_
@@ -50,16 +48,14 @@ extern bool pmt_format;
 extern bool pmt_force_mode;
 
 /* function definations */
-int listpart();
-void check_dev_point();
-void check_root();
+int listpart(void);
+void check_dev_point(void);
+void check_root(void);
 int pmt(unsigned short progress_code);
-void version();
+void version(void);
 
 #endif /* __PMT_H_ */
 
-#if defined(__cplusplus)
-}
-#endif /* __cplusplus */
+__END_DECLS
 
 /* end of code */

jni/listpart.c

@@ -40,7 +40,7 @@ extern char* cust_cxt;
 extern char* bin_name;
 
 /* list existing partitions */
-int listpart() {
+int listpart(void) {
     DIR *dir;
     struct dirent *entry;
 

jni/partition_tool.c

@@ -68,4 +68,6 @@ void check_dev_point()
 
 #if defined(__cplusplus)
 }
-#endif /* __cplusplus */
+#endif /* __cplusplus */
+
+/* end */

jni/pmt.c

@@ -205,7 +205,7 @@ int main(int argc, char* argv[])
                 break;
             default:
                 printf("Usage: %s [backup] flash] [format] [-l | --logical] [-c | --context] [-D | --list] [-v | --version] [--help] [-L | --license]\n", argv[0]);
-                exit(EX_USAGE);
+                return EX_USAGE;
         }
     }
 

jni/root.c

@@ -29,7 +29,7 @@ extern "C" {
 #include <pmt.h>
 
 /* root checker function */
-void check_root()
+void check_root(void)
 {
     /* a quick, easy method to verify root */
     if (getuid() != 0)

jni/tools.c

@@ -84,7 +84,7 @@ calc_flsz(const char* _Nonnull filepath)
  * It's for quick action.
  */
 static int
-partition_not_found()
+partition_not_found(void)
 {
     if (!pmt_silent) errx(EX_OSFILE, "partition not found!");
     else return EX_OSFILE;
@@ -95,7 +95,7 @@ partition_not_found()
  * It's for quick action.
  */
 static int
-invalid_partition_type()
+invalid_partition_type(void)
 {
     if (!pmt_silent) errx(EX_USAGE, "invalid partition type!");
     else exit(EX_USAGE);
@@ -142,7 +142,7 @@ search_stat(const char* _Nonnull filepath, const char* _Nonnull stype)
         else return -1;
     }
 
-    return 0;
+    return 2;
 }
 
 /* the partitions are meant to quickly find. */

jni/versioner.c

@@ -26,7 +26,7 @@ extern "C" {
 
 extern char* bin_name;
 
-void version()
+void version(void)
 {
     printf("%s version %d.%d.%d (code %d%d%d) ", bin_name, PMT_MAJOR, PMT_MINOR, PMT_PATCHLEVEL, PMT_MAJOR, PMT_MINOR, PMT_PATCHLEVEL);