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Index: usr.bin/sponge/Makefile
===================================================================
--- /dev/null
+++ usr.bin/sponge/Makefile
@@ -0,0 +1,5 @@
+# $FreeBSD$
+
+PROG= sponge
+
+.include <bsd.prog.mk>
Index: usr.bin/sponge/sponge.1
===================================================================
--- /dev/null
+++ usr.bin/sponge/sponge.1
@@ -0,0 +1,64 @@
+.\" Eitan Adler. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 01, 2017
+.Dt SPONGE 1
+.Os
+.Sh NAME
+.Nm sponge
+.Nd buffer stdin and write to stdout
+.Sh SYNOPSIS
+.Nm
+.Op Fl a
+.Ar filename
+.Sh DESCRIPTION
+The
+.Nm
+utility reads standard in until complete, and then opens
+the output file, and then writes to it.
+The following options are available:
+.Bl -tag -width indent
+.It Fl a
+Opens
+.Ar filename
+in append mode.
+.El
+.Pp
+In the event that malloc fails
+.Nm
+fails without output.
+.Sh SEE ALSO
+.Xr builtin 1 ,
+.Xr csh 1 ,
+.Xr getrusage 2 ,
+.Xr tee 1
+.Xr wait 2
+.Sh EXIT STATUS
+.Ex -std
+.Sh HISTORY
+A
+.Nm
+utility appeared in
+.At v3 .
Index: usr.bin/sponge/sponge.c
===================================================================
--- /dev/null
+++ usr.bin/sponge/sponge.c
@@ -0,0 +1,137 @@
+#include <assert.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <unistd.h>
+#include <sys/uio.h>
+
+#define DEFAULT_BUF_SIZE 16384
+#define DEFAULT_BUF_CNT 12
+
+static int flag_append = 0;
+
+static void usage(void);
+static void* safe_malloc(size_t size);
+static void* safe_calloc(size_t count, size_t size);
+static void* safe_reallocf(void *ptr, size_t size);
+
+static void* safe_malloc(size_t size) {
+ void* ret;
+ ret = malloc(size);
+ if (ret == NULL) {
+ perror("malloc failed");
+ exit(1);
+ }
+ return ret;
+}
+
+static void* safe_calloc(size_t count, size_t size) {
+ void* ret;
+ ret = calloc(count, size);
+ if (ret == NULL) {
+ perror("calloc failed");
+ exit(1);
+ }
+ return ret;
+}
+
+static void* safe_reallocf(void *ptr, size_t size) {
+ void* ret;
+ ret = reallocf(ptr, size);
+ if (ret == NULL) {
+ perror("reallocf failed");
+ exit(1);
+ }
+ return ret;
+}
+
+static void
+usage(void) {
+ printf("usage: sponge [-a] filename\n");
+}
+
+int
+main(int argc, char* argv[]) {
+ char* buf;
+ char* outfile;
+ int openflags = O_WRONLY;
+ ssize_t i;
+ int opt;
+ int fd;
+ size_t whichbuf;
+ size_t bufcnt;
+ struct iovec *iov;
+
+ while ((opt = getopt(argc, argv, "ah")) != -1) {
+ switch (opt) {
+ case 'a':
+ flag_append=1;
+ break;
+ case 'h':
+ usage();
+ exit(0);
+ default:
+ usage();
+ exit(1);
+ }
+ }
+
+ if (optind < argc) {
+ outfile = argv[optind];
+ }
+
+
+ bufcnt = DEFAULT_BUF_CNT;
+ whichbuf = 0;
+ iov = safe_calloc(bufcnt, sizeof(*iov));
+
+ while (true) {
+ buf = safe_malloc(DEFAULT_BUF_SIZE);
+ i = read(STDIN_FILENO, buf, DEFAULT_BUF_SIZE);
+ if (whichbuf == bufcnt) {
+ bufcnt *= 2;
+ iov = safe_reallocf(iov, bufcnt * sizeof(*iov));
+ }
+ if (i < 0) {
+ perror("read failed");
+ exit(1);
+ }
+ if (i == 0) {
+ free(buf);
+ break;
+ }
+ iov[whichbuf].iov_base = buf;
+ iov[whichbuf].iov_len = i;
+ whichbuf++;
+ buf = safe_malloc(DEFAULT_BUF_SIZE);
+ }
+
+ if (outfile) {
+ if (flag_append) {
+ openflags |= O_APPEND;
+ } else {
+ openflags |= O_TRUNC;
+ }
+ fd = open(outfile, openflags);
+ }
+ else {
+ fd = STDOUT_FILENO;
+ }
+
+ if (fd < 0) {
+ perror("failed to open");
+ exit(1);
+ }
+
+ i = writev(fd, iov, whichbuf);
+ if (i < 0) {
+ perror("Failed to write");
+ exit(1);
+ }
+
+ if (outfile) {
+ close(fd);
+ }
+}
Index: usr.bin/tee/tee.1
===================================================================
--- usr.bin/tee/tee.1
+++ usr.bin/tee/tee.1
@@ -72,6 +72,8 @@
except in the event of the
.Fl i
option.
+.Sh SEE ALSO
+.Xr sponge 1
.Sh EXIT STATUS
.Ex -std
.Sh STANDARDS

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