[OS] Added some work I did a while ago

7 files changed, 110 insertions, 0 deletions

diff --git a/Year 2/Operating Systems/Pract11/cp.c b/Year 2/Operating Systems/Pract11/cp.c
new file mode 100644
index 0000000..044b278
--- /dev/null
+++ b/Year 2/Operating Systems/Pract11/cp.c
@@ -0,0 +1,24 @@
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+const size_t BUF_SIZE = 1024;
+
+int main(int argc, char *argv[]) {
+	if (argc < 3) return 1;
+
+	int fd_from = open(argv[1], O_RDONLY);
+	if (fd_from < 0) return 2;
+
+	int fd_to = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0744);
+	if (fd_to < 0) return 3;
+
+	char buf[BUF_SIZE];
+	size_t actual = read(fd_from, buf, BUF_SIZE);
+	while (actual > 0) {
+		write(fd_to, buf, actual);
+		actual = read(fd_from, buf, BUF_SIZE);
+	}
+	return 0;
+}
diff --git a/Year 2/Operating Systems/Pract11/wc.c b/Year 2/Operating Systems/Pract11/wc.c
new file mode 100644
index 0000000..94627a0
--- /dev/null
+++ b/Year 2/Operating Systems/Pract11/wc.c
@@ -0,0 +1,37 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+
+const size_t BUF_SIZE = 1024;
+
+int main(int argc, char* argv[]) {
+	if (argc < 2) return 1;
+
+	int fd_in = open(argv[1], O_RDONLY);
+	if (fd_in < 0) return 2;
+
+	char buf[BUF_SIZE];
+	int actual = read(fd_in, buf, BUF_SIZE);
+
+	int lines = 0, words = 0, bytes = 0;
+
+	while (actual > 0) {
+		bytes += actual;
+		for (int i = 0; i < actual; i++) {
+			if (buf[i] == '\n') {
+				lines++;
+				if (i == 0 || buf[i-1] == '\n') words--;
+			}
+			else if (buf[i] == ' ') {
+				words++;
+				while (buf[i] == ' ') i++;
+			}
+		}
+		actual = read(fd_in, buf, BUF_SIZE);
+	}
+	words += lines;
+	printf("%d %d %d\n", lines, words, bytes);
+	return 0;
+}
diff --git a/Year 2/Operating Systems/Pract12/cat-my b/Year 2/Operating Systems/Pract12/cat-my
new file mode 100755
index 0000000..36409be
--- /dev/null
+++ b/Year 2/Operating Systems/Pract12/cat-my
diff --git a/Year 2/Operating Systems/Pract12/cat.c b/Year 2/Operating Systems/Pract12/cat.c
new file mode 100644
index 0000000..353e2ca
--- /dev/null
+++ b/Year 2/Operating Systems/Pract12/cat.c
@@ -0,0 +1,21 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+
+const size_t BUFF_SIZE = 1024;
+
+int main(int argc, char* argv[]) {
+	int fd_in = 0;
+	if (argc > 1)
+		fd_in = open(argv[1], O_RDONLY);
+
+	char buf[BUFF_SIZE];
+	int actual = read(fd_in, buf, BUFF_SIZE);
+	while (actual > 0) {
+		printf("%s", buf);
+		actual = read(fd_in, buf, BUFF_SIZE);
+	}
+	return 0;
+}
diff --git a/Year 2/Operating Systems/Pract12/tee-my b/Year 2/Operating Systems/Pract12/tee-my
new file mode 100755
index 0000000..8773ef6
--- /dev/null
+++ b/Year 2/Operating Systems/Pract12/tee-my
diff --git a/Year 2/Operating Systems/Pract12/tee.c b/Year 2/Operating Systems/Pract12/tee.c
new file mode 100644
index 0000000..34e9884
--- /dev/null
+++ b/Year 2/Operating Systems/Pract12/tee.c
@@ -0,0 +1,27 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+
+const size_t BUFF_SIZE = 1024;
+
+int main(int argc, char* argv[]) {
+	int fd_in = 0;
+
+	int fd_outs[BUFF_SIZE];
+	fd_outs[0] = 1; // stdout
+	for (int i = 1; i < argc; i++) {
+		fd_outs[i] = open(argv[i], O_WRONLY | O_TRUNC | O_CREAT, 0766);
+	}
+
+	char buf[BUFF_SIZE];
+	int actual = read(fd_in, buf, BUFF_SIZE);
+	while (actual > 0) {
+		for (int i = 0; i < argc; i++) {
+			write(fd_outs[i], buf, actual);
+		}
+		actual = read(fd_in, buf, BUFF_SIZE);
+	}
+	return 0;
+}
diff --git a/Year 2/Operating Systems/Pract12/test.txt b/Year 2/Operating Systems/Pract12/test.txt
new file mode 100644
index 0000000..58c2a86
--- /dev/null
+++ b/Year 2/Operating Systems/Pract12/test.txt
@@ -0,0 +1 @@
+123f