initial commit

cat.c

@@ -0,0 +1,36 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdio.h>
+#include <stdlib.h>
+#include "util.h"
+
+static void cat(FILE *, const char *);
+
+int
+main(int argc, char *argv[])
+{
+	int i;
+	FILE *fp;
+
+	if(argc == 1)
+		cat(stdin, "<stdin>");
+	else for(i = 1; i < argc; i++) {
+		if(!(fp = fopen(argv[i], "r")))
+			eprintf("fopen %s:", argv[i]);
+		cat(fp, argv[i]);
+		fclose(fp);
+	}
+	return EXIT_SUCCESS;
+}
+
+void
+cat(FILE *fp, const char *str)
+{
+	char buf[BUFSIZ];
+	size_t n;
+
+	while((n = fread(buf, 1, sizeof buf, fp)) > 0)
+		if(fwrite(buf, 1, n, stdout) != n)
+			eprintf("<stdout>: write error:");
+	if(ferror(fp))
+		eprintf("%s: read error:", str);
+}