130 lines
2.7 KiB
C
130 lines
2.7 KiB
C
/* $NetBSD: zcat.c,v 1.3 1998/11/12 16:49:47 thorpej 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 <string.h>
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#include <stdlib.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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void error __P((const char *msg));
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void gz_uncompress __P((gzFile in, FILE *out));
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int main __P((int argc, char *argv[]));
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/* ===========================================================================
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* Display error message and exit
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*/
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void error(msg)
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const char *msg;
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{
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fprintf(stderr, "%s: %s\n", prog, msg);
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exit(1);
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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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void gz_uncompress(in, out)
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gzFile in;
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FILE *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) error (gzerror(in, &err));
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if (len == 0) break;
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if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
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error("failed fwrite");
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}
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}
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if (fclose(out)) error("failed fclose");
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if (gzclose(in) != Z_OK) 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 main(argc, argv)
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int argc;
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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(fileno(stdin), "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);
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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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fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv);
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exit(1);
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}
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gz_uncompress(zfp, stdout);
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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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