[SP/P01] Solved exercises from first practice (again)

1 files changed, 31 insertions, 0 deletions

diff --git a/Year 3/System programming/Practice01/ex3-cmp.c b/Year 3/System programming/Practice01/ex3-cmp.c
new file mode 100644
index 0000000..19bc336
--- /dev/null
+++ b/Year 3/System programming/Practice01/ex3-cmp.c
@@ -0,0 +1,31 @@
+#include <unistd.h> // ssize_t, read, write
+#include <fcntl.h> // open, close, O_RDONLY, ...
+#include <stdio.h> // perror
+
+// exit 0 - equal
+// exit 1 - different
+int main(int argc, char* argv[]) {
+	int f1 = open(argv[1], O_RDONLY);
+	if (f1 < 0) {
+		perror("open");
+		return 2;
+	}
+
+	int f2 = open(argv[2], O_RDONLY);
+	if (f2 < 0) {
+		perror("open");
+		return 3;
+	}
+
+	char buf1, buf2;
+	ssize_t read1, read2;
+	do {
+		read1 = read(f1, &buf1, 1);
+		read2 = read(f2, &buf2, 1);
+		if (buf1 != buf2) return 1;
+	} while (read1 > 0 && read2 > 0);
+	if (read1 != read2) return 1;
+
+	close(f1);
+	close(f2);
+}