tried out a version of ncat but with linux system calls read/write

2 files changed, 57 insertions, 23 deletions

diff --git a/read_print_file.cpp b/read_print_file.cpp
index 327c500..1930096 100644
--- a/read_print_file.cpp
+++ b/read_print_file.cpp
@@ -3,6 +3,7 @@
 #include <fstream>
 #include <vector>
 #include <unistd.h>
+#include <fcntl.h>
 #define USAGE "rpf [-1][-2][-3][-4][-5][-6] [FILE]"
 #define VEC_BUF_SIZE 1048576 // 1 MiB
 
@@ -14,7 +15,7 @@ void PrintFile(const std::filesystem::path &path) {
 		std::cout << "Cannot open file" << std::endl;
 		return;
 	}
-	
+
 	thisfile.seekg(0, std::ios::end); // seek to end
 	auto size = thisfile.tellg(); // get size
 	std::string data(size, '\0'); // make string of appropriate size
@@ -42,12 +43,12 @@ void PrintFileBUFFERED_SINGLE_CHAR(const std::filesystem::path &path) { // extre
 		for(auto a = vecbuf.begin() ; a != vecbuf.end() ; ++a) {
 			*a = thisfile.get();
 		}
-		
+
 		for(const auto &a : vecbuf) {
 			std::cout << a;
-		}		
+		}
 	}
-	
+
 	std::cout << "File size: " << size << std::endl;
 	thisfile.close();
 }
@@ -69,7 +70,7 @@ void PrintFileBUFFERED_READ(const std::filesystem::path &path) {
 		thisfile.read(vecbuf.data(), vecbuf.size());
 		std::cout.write(vecbuf.data(), thisfile.gcount());
 	}
-	
+
 	std::cout << "File size: " << size << std::endl;
 	thisfile.close();
 }
@@ -91,7 +92,7 @@ void PrintFileBUFFERED_READ_ARRAY(const std::filesystem::path &path) {
 		thisfile.read(arrbuf, VEC_BUF_SIZE);
 		std::cout.write(arrbuf, thisfile.gcount());
 	}
-	
+
 	std::cout << "File size: " << size << std::endl;
 	thisfile.close();
 }
@@ -113,12 +114,12 @@ void PrintFileBUFFERED_READ_STRING(const std::filesystem::path &path) {
 		thisfile.read(&strbuf[0], VEC_BUF_SIZE);
 		std::cout.write(&strbuf[0], thisfile.gcount());
 	}
-	
+
 	std::cout << "File size: " << size << std::endl;
 	thisfile.close();
 }
 
-void NCAT(const std::filesystem::path &path) {
+void ncat(const std::filesystem::path &path) {
 
     FILE *file;
 	const char *filename = path.c_str();
@@ -139,7 +140,29 @@ void NCAT(const std::filesystem::path &path) {
 
 	std::cout << "File size: " << size << std::endl;
     fclose(file);
-} 
+}
+
+void ncat_write(std::filesystem::path &path) {
+
+    int file;
+	const char *filename = path.c_str();
+    file = open(filename, O_RDONLY);
+    if (file == -1) {
+        fprintf(stderr, "Cannot open file.\n");
+        return;
+    }
+
+	auto size = lseek(file, 0, SEEK_END);
+	lseek(file, 0, SEEK_SET);
+    char buffer[VEC_BUF_SIZE];
+    ssize_t bytes_read;
+    while ((bytes_read = read(file, buffer, VEC_BUF_SIZE)) > 0) {
+        write(0, buffer, bytes_read);
+    }
+
+	std::cout << "File size: " << size << std::endl;
+    close(file);
+}
 
 inline void usageOUT() {
 	std::cerr << USAGE << std::endl;
@@ -159,46 +182,52 @@ int main (int argc, char **argv) {
 	int four = 0;
 	int five = 0;
 	int six = 0;
-    while ((opt = getopt(argc, argv, "123456")) != -1) {
+	int seven = 0;
+    while ((opt = getopt(argc, argv, "1234567")) != -1) {
         switch (opt) {
         case '1':
 
 			one = 1;
-			
+
 			break;
         case '2':
 
 			two = 1;
-			
+
 			break;
 		case '3':
 
 			three = 1;
-			
+
 			break;
 		case '4':
 
 			four = 1;
-			
+
 			break;
 		case '5':
-			
+
 			five = 1;
-			
+
 			break;
 		case '6':
-			
+
 			six = 1;
-			
+
+			break;
+		case '7':
+
+			seven = 1;
+
 			break;
 		}
 	}
 
-	if((one + two + three + four + five + six) > 1) {
+	if((one + two + three + four + five + six + seven) > 1) {
 		usageOUT();
 		return EXIT_FAILURE;
 	}
-	
+
 	int index;
 	std::filesystem::path path;
 	for (index = optind ; index < argc ; index++) {
@@ -214,7 +243,7 @@ int main (int argc, char **argv) {
 		PrintFileBUFFERED_SINGLE_CHAR(path);
 		std::cout << "PrintFileBSC" << std::endl;
 	}
-	
+
 	if(three == 1) {
 		PrintFileBUFFERED_READ(path);
 		std::cout << "PrintFileBR" << std::endl;
@@ -226,7 +255,7 @@ int main (int argc, char **argv) {
 	}
 
 	if(five == 1) {
-		NCAT(path);
+		ncat(path);
 		std::cout << "NCAT" << std::endl;
 	}
 
@@ -234,6 +263,11 @@ int main (int argc, char **argv) {
 		PrintFileBUFFERED_READ_STRING(path);
 		std::cout << "PrintFileBRS" << std::endl;
 	}
-	
+
+	if(seven == 1) {
+		ncat_write(path);
+		std::cout << "NCAT_WRITE" << std::endl;
+	}
+
 	return EXIT_SUCCESS;
 }
diff --git a/rpf b/rpf
new file mode 100755
index 0000000..5615157
--- /dev/null
+++ b/rpf