bachue · January 3, 2020 07:35 · Jan 3, 2020
diff --git a/abc.h b/abc.h
@@ -0,0 +1,21 @@
+#ifndef __ABC____H
+#define __ABC____H
+
+/* Generated with cbindgen:0.12.0 */
+
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+bool read_all_from_file(FILE *file);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif // __cplusplus
+
+#endif /* __ABC____H */
diff --git a/lib.rs b/lib.rs
@@ -0,0 +1,26 @@
+use libc::{FILE, fread, feof, ferror};
+
+#[no_mangle]
+pub extern "C" fn read_all_from_file(file: *mut FILE) -> bool {
+    let mut buf = [0u8; 1 << 12];
+    let mut r = 0;
+    println!("fread() starts");
+    while unsafe { feof(file) } == 0 {
+        let hr = unsafe { fread(buf.as_mut_ptr().cast(), 1, 1 << 12, file) };
+        println!("fread() got {} bytes", hr);
+        if hr == 0 {
+            if unsafe { feof(file) } != 0 {
+                println!("feof(file) returns non-zero");
+		            break;
+            }
+            if unsafe { ferror(file) } != 0 {
+                println!("ferror() returns non-zero");
+                return false;
+            }
+        } else {
+            r += hr;
+        }
+    }
+    println!("fread() got {} bytes totally", r);
+    true
+}
diff --git a/main.cpp b/main.cpp
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include "abc.h"
+#pragma comment(lib, "abc.dll.lib")
+
+int main(int argc, char* argv[]) {
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s PATH\n", argv[0]);
+		return 1;
+	}
+
+	errno_t err;
+	FILE *file;
+	err = fopen_s(&file, argv[1], "rb");
+
+	if (err) {
+		fprintf(stderr, "Error for _wfopen_s()\n");
+		return 2;
+	}
+
+	printf("calling read_all_from_file()\n");
+	if (read_all_from_file(file)) {
+		printf("OK\n");
+	}
+	else {
+		printf("Error\n");
+	}
+
+	fclose(file);
+	return 0;
+}
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