initial commit

tee.c

@@ -0,0 +1,36 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "util.h"
+
+int
+main(int argc, char *argv[])
+{
+	bool aflag = false;
+	char buf[BUFSIZ];
+	int i, nfps = 1;
+	size_t n;
+	FILE **fps;
+
+	if(argc > 1 && !strcmp(argv[1], "-a"))
+		aflag = true;
+	if(!(fps = malloc(sizeof *fps)))
+		eprintf("malloc:");
+	fps[nfps-1] = stdout;
+
+	for(i = aflag ? 2 : 1; i < argc; i++) {
+		if(!(fps = realloc(fps, ++nfps * sizeof *fps)))
+			eprintf("realloc:");
+		if(!(fps[nfps-1] = fopen(argv[i], aflag ? "a" : "w")))
+			eprintf("fopen %s:", argv[i]);
+	}
+	while((n = fread(buf, 1, sizeof buf, stdin)) > 0)
+		for(i = 0; i < nfps; i++)
+			if(fwrite(buf, 1, n, fps[i]) != n)
+				eprintf("%s: write error:", buf);
+	if(ferror(stdin))
+		eprintf("<stdin>: read error:");
+	return EXIT_SUCCESS;
+}