add tail

cat.c

@@ -2,10 +2,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include "text.h"
 #include "util.h"
 
-static void cat(FILE *, const char *);
-
 int
 main(int argc, char *argv[])
 {
@@ -14,25 +13,12 @@ main(int argc, char *argv[])
 	if(getopt(argc, argv, "") != -1)
 		exit(EXIT_FAILURE);
 	if(optind == argc)
-		cat(stdin, "<stdin>");
+		concat(stdin, "<stdin>", stdout, "<stdout>");
 	else for(; optind < argc; optind++) {
 		if(!(fp = fopen(argv[optind], "r")))
 			eprintf("fopen %s:", argv[optind]);
-		cat(fp, argv[optind]);
+		concat(fp, argv[optind], stdout, "<stdout>");
 		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);
-}