134 lines
2.5 KiB
C
134 lines
2.5 KiB
C
/* $NetBSD: zcat.c,v 1.4 2011/05/19 22:23:12 tsutsui 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(const char *msg);
|
|
void gz_uncompress(gzFile in, FILE *out);
|
|
int main(int argc, char *argv[]);
|
|
|
|
/* ===========================================================================
|
|
* Display error message and exit
|
|
*/
|
|
void error(const char *msg)
|
|
{
|
|
|
|
fprintf(stderr, "%s: %s\n", prog, msg);
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* Uncompress input to output then close both files.
|
|
*/
|
|
void gz_uncompress(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: zcat [files...]
|
|
*/
|
|
|
|
int main(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(EXIT_FAILURE);
|
|
}
|
|
gz_uncompress(zfp, stdout);
|
|
} while (argv++, --argc);
|
|
return 0; /* to avoid warning */
|
|
}
|
|
|
|
|
|
/*
|
|
* XXX: hacks to keep gzio.c from pulling in deflate stuff
|
|
*/
|
|
|
|
int deflateInit2_(z_streamp strm, int level, int method,
|
|
int windowBits, int memLevel, int strategy,
|
|
const char *version, int stream_size)
|
|
{
|
|
|
|
return -1;
|
|
}
|
|
|
|
int deflate(z_streamp strm, int flush)
|
|
{
|
|
|
|
return -1;
|
|
}
|
|
|
|
int deflateEnd(z_streamp strm)
|
|
{
|
|
|
|
return -1;
|
|
}
|
|
|
|
int deflateParams(z_streamp strm, int level, int strategy)
|
|
{
|
|
|
|
return Z_STREAM_ERROR;
|
|
}
|