This is a minimal zcat for installation media.

distrib/utils/zcat/Makefile

@@ -0,0 +1,24 @@
+# $NetBSD: Makefile,v 1.1.1.1 1996/09/12 20:24:00 gwr Exp $
+# Small zcat (i.e. for install media)
+#
+# Note: gzio.c is compiled here with -DNO_DEFLATE
+# to eliminate references to large parts of libz.a
+
+PROG=	zcat
+NOMAN=
+SRCS=	zcat.c gzio.c
+
+SRCDIR= ${.CURDIR}/../../../lib/libz
+CFLAGS+= -D_ZLIB_PRIVATE -I${SRCDIR}
+CFLAGS+= -DNO_DEFLATE 
+
+DPADD+=	${DESTDIR}/usr/lib/libz.a
+LDADD+=	-lz
+
+all: ${PROG}
+
+.include <bsd.prog.mk>
+.PATH:  ${SRCDIR}
+
+test: zcat
+	echo 'hello, hello!' | gzip | ./zcat

distrib/utils/zcat/zcat.c

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+/*	$NetBSD: zcat.c,v 1.1.1.1 1996/09/12 20:24:00 gwr Exp $	*/
+
+/* mini zcat.c -- a minimal zcat using the zlib compression library
+ * Copyright (C) 1995-1996 Jean-loup Gailly.
+ * For conditions of distribution and use, see copyright notice in zlib.h 
+ */
+
+/*
+ * Credits, History:
+ * This program is a reduced version of the minigzip.c
+ * program originally written by Jean-loup Gailly.
+ * This reduction is the work of Gordon Ross.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "zlib.h"
+
+#define BUFLEN 4096
+
+char *prog;
+
+void error           __P((const char *msg));
+void gz_uncompress   __P((gzFile in, FILE   *out));
+int  main            __P((int argc, char *argv[]));
+
+/* ===========================================================================
+ * Display error message and exit
+ */
+void error(msg)
+    const char *msg;
+{
+    fprintf(stderr, "%s: %s\n", prog, msg);
+    exit(1);
+}
+
+/* ===========================================================================
+ * Uncompress input to output then close both files.
+ */
+void gz_uncompress(in, out)
+    gzFile in;
+    FILE   *out;
+{
+    char buf[BUFLEN];
+    int len;
+    int err;
+
+    for (;;) {
+        len = gzread(in, buf, sizeof(buf));
+        if (len < 0) error (gzerror(in, &err));
+        if (len == 0) break;
+
+        if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
+	    error("failed fwrite");
+	}
+    }
+    if (fclose(out)) error("failed fclose");
+
+    if (gzclose(in) != Z_OK) error("failed gzclose");
+}
+
+
+/* ===========================================================================
+ * Usage:  miniunzip [files...]
+ */
+
+int main(argc, argv)
+    int argc;
+    char *argv[];
+{
+    gzFile zfp;
+
+	/* save program name and skip */
+    prog = argv[0];
+    argc--, argv++;
+
+	/* ignore any switches */
+	while (*argv && (**argv == '-')) {
+        argc--, argv++;
+    }
+
+    if (argc == 0) {
+		zfp = gzdopen(fileno(stdin), "rb");
+		if (zfp == NULL)
+			error("can't gzdopen stdin");
+		gz_uncompress(zfp, stdout);
+		return 0;
+    }
+
+	do {
+		/* file_uncompress(*argv); */
+		zfp = gzopen(*argv, "rb");
+		if (zfp == NULL) {
+			fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv);
+			exit(1);
+		}
+		gz_uncompress(zfp, stdout);
+	} while (argv++, --argc);
+    return 0; /* to avoid warning */
+}