Write a simple UNIX cp clone

exercises/coreutils/cp/main.c

@@ -0,0 +1,59 @@
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define BUFFER_SIZE 4096
+
+int main(int argc, char *argv[])
+{
+	if (argc < 3) {
+		fprintf(stderr, "Usage: %s SRC DEST", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	const char *src = argv[1];
+	const char *dest = argv[2];
+
+	FILE *fp1 = fopen(src, "rb");
+	if (fp1 == NULL) {
+		perror("cannot open source file");
+		return EXIT_FAILURE;
+	}
+
+	FILE *fp2 = fopen(dest, "wb");
+	if (fp2 == NULL) {
+		perror("cannot open destination file");
+		fclose(fp1);
+		return EXIT_FAILURE;
+	}
+
+	size_t nread;
+	unsigned char buff[BUFFER_SIZE];
+	while ((nread = fread(buff, 1, sizeof(buff), fp1)) > 0) {
+		if (fwrite(buff, 1, nread, fp2) != nread) {
+			perror("fwrite");
+			fclose(fp1);
+			fclose(fp2);
+			return EXIT_FAILURE;
+		}
+	}
+
+	if (ferror(fp1)) {
+		perror("read error");
+		fclose(fp1);
+		fclose(fp2);
+		return EXIT_FAILURE;
+	}
+
+	if (fclose(fp1) != 0) {
+		perror("cannot close source file");
+		return EXIT_FAILURE;
+	}
+
+	if (fclose(fp2) != 0) {
+		perror("cannot close destination file");
+		return EXIT_FAILURE;
+	}
+
+	return EXIT_SUCCESS;
+}