147 lines
2.8 KiB
C
147 lines
2.8 KiB
C
/* $NetBSD: zcat.c,v 1.5 2017/01/12 01:58:03 christos Exp $ */
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/* mini zcat.c -- a minimal zcat using the zlib compression library
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* Copyright (C) 1995-1996 Jean-loup Gailly.
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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/*
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* Credits, History:
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* This program is a reduced version of the minigzip.c
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* program originally written by Jean-loup Gailly.
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* This reduction is the work of Gordon Ross.
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "zlib.h"
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#define BUFLEN 4096
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char *prog;
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static void error(const char *, ...) __printflike(1, 2);
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static void gz_uncompress(gzFile, int);
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/* ===========================================================================
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* Display error message and exit
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*/
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static void
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error(const char *fmt, ...)
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{
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char buf[1024];
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va_list ap;
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int l;
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l = snprintf_ss(buf, sizeof(buf), "%s: ", prog);
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write(STDERR_FILENO, buf, l);
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va_start(ap, fmt);
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l = vsnprintf_ss(buf, sizeof(buf), fmt, ap);
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va_end(ap);
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write(STDERR_FILENO, buf, l);
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_exit(EXIT_SUCCESS);
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}
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/* ===========================================================================
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* Uncompress input to output then close both files.
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*/
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static void
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gz_uncompress(gzFile in, int out)
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{
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char buf[BUFLEN];
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int len;
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int err;
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for (;;) {
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len = gzread(in, buf, sizeof(buf));
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if (len < 0)
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error ("%s", gzerror(in, &err));
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if (len == 0)
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break;
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if ((int)write(out, buf, (size_t)len) != len) {
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error("failed fwrite");
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}
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}
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if (close(out))
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error("failed fclose");
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if (gzclose(in) != Z_OK)
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error("failed gzclose");
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}
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/* ===========================================================================
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* Usage: zcat [files...]
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*/
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int
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main(int argc, char *argv[])
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{
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gzFile zfp;
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/* save program name and skip */
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prog = argv[0];
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argc--, argv++;
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/* ignore any switches */
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while (*argv && (**argv == '-')) {
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argc--, argv++;
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}
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if (argc == 0) {
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zfp = gzdopen(STDIN_FILENO, "rb");
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if (zfp == NULL)
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error("can't gzdopen stdin");
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gz_uncompress(zfp, STDOUT_FILENO);
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return 0;
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}
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do {
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/* file_uncompress(*argv); */
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zfp = gzopen(*argv, "rb");
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if (zfp == NULL) {
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error("can't gzopen `%s'", *argv);
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_exit(EXIT_FAILURE);
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}
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gz_uncompress(zfp, STDOUT_FILENO);
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} while (argv++, --argc);
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return 0; /* to avoid warning */
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}
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/*
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* XXX: hacks to keep gzio.c from pulling in deflate stuff
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*/
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int deflateInit2_(z_streamp strm, int level, int method,
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int windowBits, int memLevel, int strategy,
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const char *version, int stream_size)
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{
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return -1;
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}
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int deflate(z_streamp strm, int flush)
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{
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return -1;
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}
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int deflateEnd(z_streamp strm)
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{
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return -1;
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}
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int deflateParams(z_streamp strm, int level, int strategy)
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{
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return Z_STREAM_ERROR;
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}
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